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1.00 General Application Materials_PartK APPENDIX A1 Pre-Development 25-Year and 100-Year Hydrologic Analysis For Areas Tributary to the Abandoned Irrigation Ditch (4A, 4B, 4C, 4D1, 4D2, 5, 6 and 7) 7S PRE-AREA-07A 10S PRE-AREA-06 11S PRE-AREA-05 24S PRE-AREA-04A 25S PRE-AREA-04B 26S PRE-AREA-04C 30S PRE-AREA-04D-1 32S PRE-AREA-04D-2 9R Reach 7A-6 13R PRE-AREA-06-CULVERT 14R Reach-07A 15R Reach-06 16R PRE-AREA-05-CULVERT 17R Reach-05A 18R Reach-05B 19R Reach-05C 20R Reach-05D 21R Reach-05E 22R Reach-05F 23R Reach-05G 28R Reach-05H 31R Reach-05I 8PCB PRE-AREA-07A-CULVERT Routing Diagram for 03385-2020-20210713 Prepared by Gamba Engineering, Printed 7/14/2021 HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcat Reach Pond Link 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 2HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 25-YR Type II 24-hr Default 24.00 1 2.21 2 2 100-YR Type II 24-hr Default 24.00 1 2.81 2 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 3HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 0.817 71 Meadow, non-grazed, HSG C (26S, 30S) 44.064 57 Oak/aspen range, Fair, HSG C (7S, 10S, 11S, 24S, 25S, 26S, 30S, 32S) 72.910 41 Oak/aspen range, Good, HSG C (10S, 11S) 0.460 98 Paved parking, HSG C (24S, 25S, 26S, 30S, 32S) 118.251 47 TOTAL AREA 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 4HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Soil Listing (selected nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 118.251 HSG C 7S, 10S, 11S, 24S, 25S, 26S, 30S, 32S 0.000 HSG D 0.000 Other 118.251 TOTAL AREA 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 5HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Ground Covers (selected nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.817 0.000 0.000 0.817 Meadow, non-grazed 26S, 30S 0.000 0.000 44.064 0.000 0.000 44.064 Oak/aspen range, Fair 7S, 10S, 11S, 24S, 25S, 26S, 30S, 32S 0.000 0.000 72.910 0.000 0.000 72.910 Oak/aspen range, Good 10S, 11S 0.000 0.000 0.460 0.000 0.000 0.460 Paved parking 24S, 25S, 26S, 30S, 32S 0.000 0.000 118.251 0.000 0.000 118.251 TOTAL AREA 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 6HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Pipe Listing (selected nodes) Line# Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) n Width (inches) Diam/Height (inches) Inside-Fill (inches) 1 13R 6,944.72 6,944.12 30.0 0.0200 0.025 0.0 18.0 8.0 2 16R 6,923.48 6,922.88 30.0 0.0200 0.012 0.0 12.0 5.0 3 8P 6,992.37 6,991.77 30.0 0.0200 0.025 0.0 18.0 16.5 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 7HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Time span=5.00-30.00 hrs, dt=0.03 hrs, 834 points x 3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=5.631 ac 0.00% Impervious Runoff Depth=0.13"Subcatchment 7S: PRE-AREA-07A Flow Length=813' Tc=55.4 min CN=57 Runoff=0.18 cfs 0.063 af Runoff Area=76.472 ac 0.00% Impervious Runoff Depth=0.02"Subcatchment 10S: PRE-AREA-06 Flow Length=4,044' Tc=99.4 min CN=46 Runoff=0.14 cfs 0.105 af Runoff Area=27.686 ac 0.00% Impervious Runoff Depth=0.02"Subcatchment 11S: PRE-AREA-05 Flow Length=5,152' Tc=107.9 min CN=46 Runoff=0.05 cfs 0.038 af Runoff Area=0.786 ac 7.51% Impervious Runoff Depth=0.19"Subcatchment 24S: PRE-AREA-04A Flow Length=208' Tc=45.0 min CN=60 Runoff=0.05 cfs 0.012 af Runoff Area=0.792 ac 10.86% Impervious Runoff Depth=0.20"Subcatchment 25S: PRE-AREA-04B Flow Length=328' Tc=33.8 min CN=61 Runoff=0.07 cfs 0.014 af Runoff Area=2.704 ac 6.84% Impervious Runoff Depth=0.22"Subcatchment 26S: PRE-AREA-04C Flow Length=525' Tc=25.7 min CN=62 Runoff=0.34 cfs 0.051 af Runoff Area=2.220 ac 3.38% Impervious Runoff Depth=0.20"Subcatchment 30S: PRE-AREA-04D-1 Flow Length=574' Tc=25.0 min CN=61 Runoff=0.24 cfs 0.038 af Runoff Area=1.960 ac 2.81% Impervious Runoff Depth=0.15"Subcatchment 32S: PRE-AREA-04D-2 Flow Length=707' Tc=29.6 min CN=58 Runoff=0.11 cfs 0.025 af Avg. Flow Depth=0.11' Max Vel=1.96 fps Inflow=0.06 cfs 0.004 afReach 9R: Reach 7A-6 n=0.030 L=626.8' S=0.0800 '/' Capacity=21.00 cfs Outflow=0.06 cfs 0.004 af Avg. Flow Depth=0.07' Max Vel=1.33 fps Inflow=0.14 cfs 0.109 afReach 13R: PRE-AREA-06-CULVERT 18.0" Round Pipe w/ 8.0" inside fill n=0.025 L=30.0' S=0.0200 '/' Capacity=3.37 cfs Outflow=0.14 cfs 0.109 af Avg. Flow Depth=0.02' Max Vel=1.42 fps Inflow=0.12 cfs 0.060 afReach 14R: Reach-07A n=0.035 L=355.0' S=0.3195 '/' Capacity=26.97 cfs Outflow=0.12 cfs 0.060 af Avg. Flow Depth=0.02' Max Vel=1.39 fps Inflow=0.14 cfs 0.109 afReach 15R: Reach-06 n=0.035 L=188.3' S=0.2577 '/' Capacity=24.22 cfs Outflow=0.14 cfs 0.109 af Avg. Flow Depth=0.03' Max Vel=1.65 fps Inflow=0.05 cfs 0.038 afReach 16R: PRE-AREA-05-CULVERT 12.0" Round Pipe w/ 5.0" inside fill n=0.012 L=30.0' S=0.0200 '/' Capacity=2.60 cfs Outflow=0.05 cfs 0.038 af Avg. Flow Depth=0.01' Max Vel=0.82 fps Inflow=0.05 cfs 0.038 afReach 17R: Reach-05A n=0.035 L=173.7' S=0.1471 '/' Capacity=18.30 cfs Outflow=0.05 cfs 0.038 af Avg. Flow Depth=0.14' Max Vel=0.91 fps Inflow=0.06 cfs 0.050 afReach 18R: Reach-05B n=0.035 L=104.5' S=0.0166 '/' Capacity=9.97 cfs Outflow=0.06 cfs 0.050 af Avg. Flow Depth=0.21' Max Vel=1.58 fps Inflow=0.20 cfs 0.173 afReach 19R: Reach-05C n=0.035 L=148.2' S=0.0310 '/' Capacity=13.65 cfs Outflow=0.20 cfs 0.173 af Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 8HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Avg. Flow Depth=0.18' Max Vel=3.05 fps Inflow=0.20 cfs 0.173 afReach 20R: Reach-05D n=0.035 L=89.1' S=0.1422 '/' Capacity=1,368.86 cfs Outflow=0.20 cfs 0.173 af Avg. Flow Depth=0.25' Max Vel=3.54 fps Inflow=0.46 cfs 0.283 afReach 21R: Reach-05E n=0.030 L=224.8' S=0.0917 '/' Capacity=328.40 cfs Outflow=0.46 cfs 0.283 af Avg. Flow Depth=0.24' Max Vel=2.73 fps Inflow=0.46 cfs 0.283 afReach 22R: Reach-05F n=0.030 L=61.2' S=0.0559 '/' Capacity=8.25 cfs Outflow=0.46 cfs 0.283 af Avg. Flow Depth=0.37' Max Vel=1.80 fps Inflow=0.68 cfs 0.321 afReach 23R: Reach-05G n=0.040 L=53.6' S=0.0243 '/' Capacity=2.09 cfs Outflow=0.68 cfs 0.321 af Avg. Flow Depth=0.30' Max Vel=2.15 fps Inflow=0.68 cfs 0.321 afReach 28R: Reach-05H n=0.040 L=89.9' S=0.0445 '/' Capacity=5.31 cfs Outflow=0.68 cfs 0.321 af Avg. Flow Depth=0.28' Max Vel=2.79 fps Inflow=0.79 cfs 0.346 afReach 31R: Reach-05I n=0.040 L=80.7' S=0.0809 '/' Capacity=7.16 cfs Outflow=0.79 cfs 0.346 af Peak Elev=6,994.98' Inflow=0.18 cfs 0.063 afPond 8P: PRE-AREA-07A-CULVERT Primary=0.12 cfs 0.060 af Secondary=0.06 cfs 0.004 af Outflow=0.18 cfs 0.063 af Total Runoff Area = 118.251 ac Runoff Volume = 0.346 af Average Runoff Depth = 0.04" 99.61% Pervious = 117.791 ac 0.39% Impervious = 0.460 ac Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 9HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: PRE-AREA-07A Runoff = 0.18 cfs @ 12.85 hrs, Volume= 0.063 af, Depth= 0.13" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.15 Area (ac) CN Description 5.631 57 Oak/aspen range, Fair, HSG C 5.631 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 48.9 270 0.2237 0.09 Sheet Flow, Oak Brush Woods: Dense underbrush n= 0.800 P2= 1.33" 6.3 521 0.3082 1.39 Shallow Concentrated Flow, Oak Brush Forest w/Heavy Litter Kv= 2.5 fps 0.2 22 0.0581 2.43 0.38 Trap/Vee/Rect Channel Flow, Roadside Ditch Bot.W=0.00' D=0.25' Z= 2.5 '/' Top.W=1.25' n= 0.035 Earth, dense weeds 55.4 813 Total Subcatchment 7S: PRE-AREA-07A Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type II 24-hr 25-YR Rainfall=2.21" Ia/S=0.15 Runoff Area=5.631 ac Runoff Volume=0.063 af Runoff Depth=0.13" Flow Length=813' Tc=55.4 min CN=57 0.18 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 10HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 7S: PRE-AREA-07A Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.14 0.00 0.00 5.30 0.15 0.00 0.00 5.60 0.16 0.00 0.00 5.90 0.17 0.00 0.00 6.20 0.18 0.00 0.00 6.50 0.20 0.00 0.00 6.80 0.21 0.00 0.00 7.10 0.22 0.00 0.00 7.40 0.24 0.00 0.00 7.70 0.25 0.00 0.00 8.00 0.27 0.00 0.00 8.30 0.28 0.00 0.00 8.60 0.30 0.00 0.00 8.90 0.32 0.00 0.00 9.20 0.34 0.00 0.00 9.50 0.36 0.00 0.00 9.80 0.38 0.00 0.00 10.10 0.41 0.00 0.00 10.40 0.44 0.00 0.00 10.70 0.48 0.00 0.00 11.00 0.52 0.00 0.00 11.30 0.58 0.00 0.00 11.60 0.68 0.00 0.00 11.90 1.25 0.00 0.00 12.20 1.54 0.02 0.03 12.50 1.62 0.03 0.12 12.80 1.68 0.04 0.18 13.10 1.72 0.04 0.16 13.40 1.76 0.05 0.14 13.70 1.79 0.05 0.12 14.00 1.81 0.06 0.10 14.30 1.84 0.06 0.09 14.60 1.86 0.06 0.08 14.90 1.88 0.07 0.08 15.20 1.90 0.07 0.07 15.50 1.92 0.07 0.07 15.80 1.93 0.08 0.07 16.10 1.95 0.08 0.06 16.40 1.96 0.08 0.06 16.70 1.98 0.09 0.06 17.00 1.99 0.09 0.05 17.30 2.01 0.09 0.05 17.60 2.02 0.09 0.05 17.90 2.03 0.10 0.05 18.20 2.04 0.10 0.05 18.50 2.05 0.10 0.05 18.80 2.07 0.10 0.05 19.10 2.08 0.11 0.04 19.40 2.09 0.11 0.04 19.70 2.10 0.11 0.04 20.00 2.10 0.11 0.04 20.30 2.11 0.11 0.04 20.60 2.12 0.11 0.04 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.13 0.12 0.04 21.20 2.14 0.12 0.04 21.50 2.15 0.12 0.03 21.80 2.15 0.12 0.03 22.10 2.16 0.12 0.03 22.40 2.17 0.13 0.03 22.70 2.18 0.13 0.03 23.00 2.19 0.13 0.03 23.30 2.19 0.13 0.03 23.60 2.20 0.13 0.03 23.90 2.21 0.13 0.03 24.20 2.21 0.13 0.03 24.50 2.21 0.13 0.03 24.80 2.21 0.13 0.02 25.10 2.21 0.13 0.01 25.40 2.21 0.13 0.00 25.70 2.21 0.13 0.00 26.00 2.21 0.13 0.00 26.30 2.21 0.13 0.00 26.60 2.21 0.13 0.00 26.90 2.21 0.13 0.00 27.20 2.21 0.13 0.00 27.50 2.21 0.13 0.00 27.80 2.21 0.13 0.00 28.10 2.21 0.13 0.00 28.40 2.21 0.13 0.00 28.70 2.21 0.13 0.00 29.00 2.21 0.13 0.00 29.30 2.21 0.13 0.00 29.60 2.21 0.13 0.00 29.90 2.21 0.13 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 11HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 10S: PRE-AREA-06 Runoff = 0.14 cfs @ 19.55 hrs, Volume= 0.105 af, Depth= 0.02" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.15 Area (ac) CN Description 53.530 41 Oak/aspen range, Good, HSG C 22.942 57 Oak/aspen range, Fair, HSG C 76.472 46 Weighted Average 76.472 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 45.3 201 0.1496 0.07 Sheet Flow, Oak - Aspen Woods: Dense underbrush n= 0.800 P2= 1.33" 53.4 3,697 0.2131 1.15 Shallow Concentrated Flow, Oak Brush Forest w/Heavy Litter Kv= 2.5 fps 0.7 146 0.0847 3.43 0.54 Trap/Vee/Rect Channel Flow, Roadside Ditch Bot.W=0.00' D=0.25' Z= 2.5 '/' Top.W=1.25' n= 0.030 Earth, grassed & winding 99.4 4,044 Total Subcatchment 10S: PRE-AREA-06 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type II 24-hr 25-YR Rainfall=2.21" Ia/S=0.15 Runoff Area=76.472 ac Runoff Volume=0.105 af Runoff Depth=0.02" Flow Length=4,044' Tc=99.4 min CN=46 0.14 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 12HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 10S: PRE-AREA-06 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.14 0.00 0.00 5.30 0.15 0.00 0.00 5.60 0.16 0.00 0.00 5.90 0.17 0.00 0.00 6.20 0.18 0.00 0.00 6.50 0.20 0.00 0.00 6.80 0.21 0.00 0.00 7.10 0.22 0.00 0.00 7.40 0.24 0.00 0.00 7.70 0.25 0.00 0.00 8.00 0.27 0.00 0.00 8.30 0.28 0.00 0.00 8.60 0.30 0.00 0.00 8.90 0.32 0.00 0.00 9.20 0.34 0.00 0.00 9.50 0.36 0.00 0.00 9.80 0.38 0.00 0.00 10.10 0.41 0.00 0.00 10.40 0.44 0.00 0.00 10.70 0.48 0.00 0.00 11.00 0.52 0.00 0.00 11.30 0.58 0.00 0.00 11.60 0.68 0.00 0.00 11.90 1.25 0.00 0.00 12.20 1.54 0.00 0.00 12.50 1.62 0.00 0.00 12.80 1.68 0.00 0.00 13.10 1.72 0.00 0.00 13.40 1.76 0.00 0.00 13.70 1.79 0.00 0.00 14.00 1.81 0.00 0.00 14.30 1.84 0.00 0.00 14.60 1.86 0.00 0.01 14.90 1.88 0.00 0.02 15.20 1.90 0.00 0.04 15.50 1.92 0.00 0.05 15.80 1.93 0.00 0.07 16.10 1.95 0.00 0.08 16.40 1.96 0.00 0.09 16.70 1.98 0.00 0.10 17.00 1.99 0.00 0.11 17.30 2.01 0.01 0.12 17.60 2.02 0.01 0.12 17.90 2.03 0.01 0.12 18.20 2.04 0.01 0.13 18.50 2.05 0.01 0.13 18.80 2.07 0.01 0.13 19.10 2.08 0.01 0.14 19.40 2.09 0.01 0.14 19.70 2.10 0.01 0.14 20.00 2.10 0.01 0.14 20.30 2.11 0.01 0.13 20.60 2.12 0.01 0.13 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.13 0.01 0.13 21.20 2.14 0.01 0.13 21.50 2.15 0.01 0.13 21.80 2.15 0.01 0.13 22.10 2.16 0.01 0.13 22.40 2.17 0.01 0.13 22.70 2.18 0.01 0.13 23.00 2.19 0.01 0.13 23.30 2.19 0.02 0.13 23.60 2.20 0.02 0.13 23.90 2.21 0.02 0.13 24.20 2.21 0.02 0.13 24.50 2.21 0.02 0.13 24.80 2.21 0.02 0.12 25.10 2.21 0.02 0.09 25.40 2.21 0.02 0.07 25.70 2.21 0.02 0.04 26.00 2.21 0.02 0.03 26.30 2.21 0.02 0.02 26.60 2.21 0.02 0.01 26.90 2.21 0.02 0.01 27.20 2.21 0.02 0.00 27.50 2.21 0.02 0.00 27.80 2.21 0.02 0.00 28.10 2.21 0.02 0.00 28.40 2.21 0.02 0.00 28.70 2.21 0.02 0.00 29.00 2.21 0.02 0.00 29.30 2.21 0.02 0.00 29.60 2.21 0.02 0.00 29.90 2.21 0.02 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 13HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 11S: PRE-AREA-05 Runoff = 0.05 cfs @ 19.78 hrs, Volume= 0.038 af, Depth= 0.02" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.15 Area (ac) CN Description 19.380 41 Oak/aspen range, Good, HSG C 8.306 57 Oak/aspen range, Fair, HSG C 27.686 46 Weighted Average 27.686 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 34.7 200 0.2894 0.10 Sheet Flow, Oak-Aspen Woods: Dense underbrush n= 0.800 P2= 1.33" 69.4 4,586 0.1943 1.10 Shallow Concentrated Flow, Oak-Aspen Forest w/Heavy Litter Kv= 2.5 fps 1.5 131 0.0375 1.45 0.35 Trap/Vee/Rect Channel Flow, Channel along old RR Grade Bot.W=0.00' D=0.15' Z= 2.2 & 19.3 '/' Top.W=3.23' n= 0.035 Earth, dense weeds 1.7 110 0.1888 1.09 Shallow Concentrated Flow, Oak Brush Forest w/Heavy Litter Kv= 2.5 fps 0.6 125 0.0785 3.30 0.52 Trap/Vee/Rect Channel Flow, Roadside Ditch Bot.W=0.00' D=0.25' Z= 2.5 '/' Top.W=1.25' n= 0.030 Earth, grassed & winding 107.9 5,152 Total Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 14HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcatchment 11S: PRE-AREA-05 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type II 24-hr 25-YR Rainfall=2.21" Ia/S=0.15 Runoff Area=27.686 ac Runoff Volume=0.038 af Runoff Depth=0.02" Flow Length=5,152' Tc=107.9 min CN=46 0.05 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 15HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 11S: PRE-AREA-05 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.14 0.00 0.00 5.30 0.15 0.00 0.00 5.60 0.16 0.00 0.00 5.90 0.17 0.00 0.00 6.20 0.18 0.00 0.00 6.50 0.20 0.00 0.00 6.80 0.21 0.00 0.00 7.10 0.22 0.00 0.00 7.40 0.24 0.00 0.00 7.70 0.25 0.00 0.00 8.00 0.27 0.00 0.00 8.30 0.28 0.00 0.00 8.60 0.30 0.00 0.00 8.90 0.32 0.00 0.00 9.20 0.34 0.00 0.00 9.50 0.36 0.00 0.00 9.80 0.38 0.00 0.00 10.10 0.41 0.00 0.00 10.40 0.44 0.00 0.00 10.70 0.48 0.00 0.00 11.00 0.52 0.00 0.00 11.30 0.58 0.00 0.00 11.60 0.68 0.00 0.00 11.90 1.25 0.00 0.00 12.20 1.54 0.00 0.00 12.50 1.62 0.00 0.00 12.80 1.68 0.00 0.00 13.10 1.72 0.00 0.00 13.40 1.76 0.00 0.00 13.70 1.79 0.00 0.00 14.00 1.81 0.00 0.00 14.30 1.84 0.00 0.00 14.60 1.86 0.00 0.00 14.90 1.88 0.00 0.01 15.20 1.90 0.00 0.01 15.50 1.92 0.00 0.02 15.80 1.93 0.00 0.02 16.10 1.95 0.00 0.03 16.40 1.96 0.00 0.03 16.70 1.98 0.00 0.04 17.00 1.99 0.00 0.04 17.30 2.01 0.01 0.04 17.60 2.02 0.01 0.04 17.90 2.03 0.01 0.04 18.20 2.04 0.01 0.05 18.50 2.05 0.01 0.05 18.80 2.07 0.01 0.05 19.10 2.08 0.01 0.05 19.40 2.09 0.01 0.05 19.70 2.10 0.01 0.05 20.00 2.10 0.01 0.05 20.30 2.11 0.01 0.05 20.60 2.12 0.01 0.05 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.13 0.01 0.05 21.20 2.14 0.01 0.05 21.50 2.15 0.01 0.05 21.80 2.15 0.01 0.05 22.10 2.16 0.01 0.05 22.40 2.17 0.01 0.05 22.70 2.18 0.01 0.05 23.00 2.19 0.01 0.05 23.30 2.19 0.02 0.05 23.60 2.20 0.02 0.05 23.90 2.21 0.02 0.05 24.20 2.21 0.02 0.05 24.50 2.21 0.02 0.05 24.80 2.21 0.02 0.04 25.10 2.21 0.02 0.04 25.40 2.21 0.02 0.03 25.70 2.21 0.02 0.02 26.00 2.21 0.02 0.01 26.30 2.21 0.02 0.01 26.60 2.21 0.02 0.01 26.90 2.21 0.02 0.00 27.20 2.21 0.02 0.00 27.50 2.21 0.02 0.00 27.80 2.21 0.02 0.00 28.10 2.21 0.02 0.00 28.40 2.21 0.02 0.00 28.70 2.21 0.02 0.00 29.00 2.21 0.02 0.00 29.30 2.21 0.02 0.00 29.60 2.21 0.02 0.00 29.90 2.21 0.02 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 16HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 24S: PRE-AREA-04A Runoff = 0.05 cfs @ 12.60 hrs, Volume= 0.012 af, Depth= 0.19" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.15 Area (ac) CN Description 0.727 57 Oak/aspen range, Fair, HSG C 0.059 98 Paved parking, HSG C 0.786 60 Weighted Average 0.727 92.49% Pervious Area 0.059 7.51% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.2 12 0.0899 1.06 Sheet Flow, Driveway Pavement Smooth surfaces n= 0.011 P2= 1.33" 44.7 188 0.1357 0.07 Sheet Flow, Oak Brush Woods: Dense underbrush n= 0.800 P2= 1.33" 0.1 8 0.2439 1.23 Shallow Concentrated Flow, Oak Brush Forest w/Heavy Litter Kv= 2.5 fps 45.0 208 Total Subcatchment 24S: PRE-AREA-04A Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type II 24-hr 25-YR Rainfall=2.21" Ia/S=0.15 Runoff Area=0.786 ac Runoff Volume=0.012 af Runoff Depth=0.19" Flow Length=208' Tc=45.0 min CN=60 0.05 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 17HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 24S: PRE-AREA-04A Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.14 0.00 0.00 5.30 0.15 0.00 0.00 5.60 0.16 0.00 0.00 5.90 0.17 0.00 0.00 6.20 0.18 0.00 0.00 6.50 0.20 0.00 0.00 6.80 0.21 0.00 0.00 7.10 0.22 0.00 0.00 7.40 0.24 0.00 0.00 7.70 0.25 0.00 0.00 8.00 0.27 0.00 0.00 8.30 0.28 0.00 0.00 8.60 0.30 0.00 0.00 8.90 0.32 0.00 0.00 9.20 0.34 0.00 0.00 9.50 0.36 0.00 0.00 9.80 0.38 0.00 0.00 10.10 0.41 0.00 0.00 10.40 0.44 0.00 0.00 10.70 0.48 0.00 0.00 11.00 0.52 0.00 0.00 11.30 0.58 0.00 0.00 11.60 0.68 0.00 0.00 11.90 1.25 0.01 0.00 12.20 1.54 0.04 0.02 12.50 1.62 0.05 0.05 12.80 1.68 0.06 0.04 13.10 1.72 0.07 0.03 13.40 1.76 0.08 0.03 13.70 1.79 0.08 0.02 14.00 1.81 0.09 0.02 14.30 1.84 0.09 0.02 14.60 1.86 0.10 0.01 14.90 1.88 0.10 0.01 15.20 1.90 0.11 0.01 15.50 1.92 0.11 0.01 15.80 1.93 0.11 0.01 16.10 1.95 0.12 0.01 16.40 1.96 0.12 0.01 16.70 1.98 0.13 0.01 17.00 1.99 0.13 0.01 17.30 2.01 0.13 0.01 17.60 2.02 0.14 0.01 17.90 2.03 0.14 0.01 18.20 2.04 0.14 0.01 18.50 2.05 0.14 0.01 18.80 2.07 0.15 0.01 19.10 2.08 0.15 0.01 19.40 2.09 0.15 0.01 19.70 2.10 0.15 0.01 20.00 2.10 0.16 0.01 20.30 2.11 0.16 0.01 20.60 2.12 0.16 0.01 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.13 0.16 0.01 21.20 2.14 0.17 0.01 21.50 2.15 0.17 0.01 21.80 2.15 0.17 0.01 22.10 2.16 0.17 0.01 22.40 2.17 0.17 0.01 22.70 2.18 0.18 0.01 23.00 2.19 0.18 0.01 23.30 2.19 0.18 0.01 23.60 2.20 0.18 0.01 23.90 2.21 0.19 0.01 24.20 2.21 0.19 0.01 24.50 2.21 0.19 0.00 24.80 2.21 0.19 0.00 25.10 2.21 0.19 0.00 25.40 2.21 0.19 0.00 25.70 2.21 0.19 0.00 26.00 2.21 0.19 0.00 26.30 2.21 0.19 0.00 26.60 2.21 0.19 0.00 26.90 2.21 0.19 0.00 27.20 2.21 0.19 0.00 27.50 2.21 0.19 0.00 27.80 2.21 0.19 0.00 28.10 2.21 0.19 0.00 28.40 2.21 0.19 0.00 28.70 2.21 0.19 0.00 29.00 2.21 0.19 0.00 29.30 2.21 0.19 0.00 29.60 2.21 0.19 0.00 29.90 2.21 0.19 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 18HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 25S: PRE-AREA-04B Runoff = 0.07 cfs @ 12.41 hrs, Volume= 0.014 af, Depth= 0.20" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.15 Area (ac) CN Description 0.706 57 Oak/aspen range, Fair, HSG C 0.086 98 Paved parking, HSG C 0.792 61 Weighted Average 0.706 89.14% Pervious Area 0.086 10.86% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.8 56 0.0619 1.24 Sheet Flow, Driveway Pavement Smooth surfaces n= 0.011 P2= 1.33" 31.3 144 0.1938 0.08 Sheet Flow, Oak Brush Woods: Dense underbrush n= 0.800 P2= 1.33" 0.4 23 0.1605 1.00 Shallow Concentrated Flow, Oak Brush Forest w/Heavy Litter Kv= 2.5 fps 1.3 105 0.0166 1.32 0.25 Trap/Vee/Rect Channel Flow, Old Irrigation Ditch Bot.W=0.00' D=0.25' Z= 3.0 '/' Top.W=1.50' n= 0.035 Earth, dense weeds 33.8 328 Total Subcatchment 25S: PRE-AREA-04B Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type II 24-hr 25-YR Rainfall=2.21" Ia/S=0.15 Runoff Area=0.792 ac Runoff Volume=0.014 af Runoff Depth=0.20" Flow Length=328' Tc=33.8 min CN=61 0.07 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 19HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 25S: PRE-AREA-04B Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.14 0.00 0.00 5.30 0.15 0.00 0.00 5.60 0.16 0.00 0.00 5.90 0.17 0.00 0.00 6.20 0.18 0.00 0.00 6.50 0.20 0.00 0.00 6.80 0.21 0.00 0.00 7.10 0.22 0.00 0.00 7.40 0.24 0.00 0.00 7.70 0.25 0.00 0.00 8.00 0.27 0.00 0.00 8.30 0.28 0.00 0.00 8.60 0.30 0.00 0.00 8.90 0.32 0.00 0.00 9.20 0.34 0.00 0.00 9.50 0.36 0.00 0.00 9.80 0.38 0.00 0.00 10.10 0.41 0.00 0.00 10.40 0.44 0.00 0.00 10.70 0.48 0.00 0.00 11.00 0.52 0.00 0.00 11.30 0.58 0.00 0.00 11.60 0.68 0.00 0.00 11.90 1.25 0.01 0.00 12.20 1.54 0.05 0.04 12.50 1.62 0.06 0.07 12.80 1.68 0.07 0.04 13.10 1.72 0.08 0.03 13.40 1.76 0.09 0.02 13.70 1.79 0.09 0.02 14.00 1.81 0.10 0.02 14.30 1.84 0.11 0.02 14.60 1.86 0.11 0.01 14.90 1.88 0.12 0.01 15.20 1.90 0.12 0.01 15.50 1.92 0.12 0.01 15.80 1.93 0.13 0.01 16.10 1.95 0.13 0.01 16.40 1.96 0.14 0.01 16.70 1.98 0.14 0.01 17.00 1.99 0.14 0.01 17.30 2.01 0.15 0.01 17.60 2.02 0.15 0.01 17.90 2.03 0.15 0.01 18.20 2.04 0.16 0.01 18.50 2.05 0.16 0.01 18.80 2.07 0.16 0.01 19.10 2.08 0.17 0.01 19.40 2.09 0.17 0.01 19.70 2.10 0.17 0.01 20.00 2.10 0.17 0.01 20.30 2.11 0.18 0.01 20.60 2.12 0.18 0.01 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.13 0.18 0.01 21.20 2.14 0.18 0.01 21.50 2.15 0.19 0.01 21.80 2.15 0.19 0.01 22.10 2.16 0.19 0.01 22.40 2.17 0.19 0.01 22.70 2.18 0.20 0.01 23.00 2.19 0.20 0.01 23.30 2.19 0.20 0.01 23.60 2.20 0.20 0.01 23.90 2.21 0.20 0.01 24.20 2.21 0.20 0.01 24.50 2.21 0.20 0.00 24.80 2.21 0.20 0.00 25.10 2.21 0.20 0.00 25.40 2.21 0.20 0.00 25.70 2.21 0.20 0.00 26.00 2.21 0.20 0.00 26.30 2.21 0.20 0.00 26.60 2.21 0.20 0.00 26.90 2.21 0.20 0.00 27.20 2.21 0.20 0.00 27.50 2.21 0.20 0.00 27.80 2.21 0.20 0.00 28.10 2.21 0.20 0.00 28.40 2.21 0.20 0.00 28.70 2.21 0.20 0.00 29.00 2.21 0.20 0.00 29.30 2.21 0.20 0.00 29.60 2.21 0.20 0.00 29.90 2.21 0.20 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 20HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 26S: PRE-AREA-04C [47] Hint: Peak is 101% of capacity of segment #4 Runoff = 0.34 cfs @ 12.27 hrs, Volume= 0.051 af, Depth= 0.22" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.15 Area (ac) CN Description 2.067 57 Oak/aspen range, Fair, HSG C 0.452 71 Meadow, non-grazed, HSG C 0.185 98 Paved parking, HSG C 2.704 62 Weighted Average 2.519 93.16% Pervious Area 0.185 6.84% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 91 0.0785 1.50 Sheet Flow, Driveway Pavement Smooth surfaces n= 0.011 P2= 1.33" 21.8 109 0.2746 0.08 Sheet Flow, Oak Brush Woods: Dense underbrush n= 0.800 P2= 1.33" 1.2 88 0.2304 1.20 Shallow Concentrated Flow, Oak Brush Forest w/Heavy Litter Kv= 2.5 fps 1.4 148 0.0310 1.80 0.34 Trap/Vee/Rect Channel Flow, Old Irrigation Ditch (Reach 05C) Bot.W=0.00' D=0.25' Z= 3.0 '/' Top.W=1.50' n= 0.035 Earth, dense weeds 0.3 89 0.1423 5.90 2.95 Trap/Vee/Rect Channel Flow, Old Irrigation Ditch (Reach 05D) Bot.W=0.00' D=0.50' Z= 2.0 '/' Top.W=2.00' n= 0.035 Earth, dense weeds 25.7 525 Total Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 21HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcatchment 26S: PRE-AREA-04C Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr 25-YR Rainfall=2.21" Ia/S=0.15 Runoff Area=2.704 ac Runoff Volume=0.051 af Runoff Depth=0.22" Flow Length=525' Tc=25.7 min CN=62 0.34 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 22HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 26S: PRE-AREA-04C Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.14 0.00 0.00 5.30 0.15 0.00 0.00 5.60 0.16 0.00 0.00 5.90 0.17 0.00 0.00 6.20 0.18 0.00 0.00 6.50 0.20 0.00 0.00 6.80 0.21 0.00 0.00 7.10 0.22 0.00 0.00 7.40 0.24 0.00 0.00 7.70 0.25 0.00 0.00 8.00 0.27 0.00 0.00 8.30 0.28 0.00 0.00 8.60 0.30 0.00 0.00 8.90 0.32 0.00 0.00 9.20 0.34 0.00 0.00 9.50 0.36 0.00 0.00 9.80 0.38 0.00 0.00 10.10 0.41 0.00 0.00 10.40 0.44 0.00 0.00 10.70 0.48 0.00 0.00 11.00 0.52 0.00 0.00 11.30 0.58 0.00 0.00 11.60 0.68 0.00 0.00 11.90 1.25 0.02 0.00 12.20 1.54 0.06 0.32 12.50 1.62 0.07 0.23 12.80 1.68 0.08 0.14 13.10 1.72 0.09 0.10 13.40 1.76 0.10 0.08 13.70 1.79 0.11 0.07 14.00 1.81 0.11 0.06 14.30 1.84 0.12 0.06 14.60 1.86 0.12 0.05 14.90 1.88 0.13 0.05 15.20 1.90 0.14 0.05 15.50 1.92 0.14 0.05 15.80 1.93 0.14 0.04 16.10 1.95 0.15 0.04 16.40 1.96 0.15 0.04 16.70 1.98 0.16 0.04 17.00 1.99 0.16 0.04 17.30 2.01 0.16 0.03 17.60 2.02 0.17 0.03 17.90 2.03 0.17 0.03 18.20 2.04 0.17 0.03 18.50 2.05 0.18 0.03 18.80 2.07 0.18 0.03 19.10 2.08 0.18 0.03 19.40 2.09 0.19 0.03 19.70 2.10 0.19 0.03 20.00 2.10 0.19 0.02 20.30 2.11 0.19 0.02 20.60 2.12 0.20 0.02 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.13 0.20 0.02 21.20 2.14 0.20 0.02 21.50 2.15 0.20 0.02 21.80 2.15 0.21 0.02 22.10 2.16 0.21 0.02 22.40 2.17 0.21 0.02 22.70 2.18 0.21 0.02 23.00 2.19 0.22 0.02 23.30 2.19 0.22 0.02 23.60 2.20 0.22 0.02 23.90 2.21 0.22 0.02 24.20 2.21 0.22 0.02 24.50 2.21 0.22 0.00 24.80 2.21 0.22 0.00 25.10 2.21 0.22 0.00 25.40 2.21 0.22 0.00 25.70 2.21 0.22 0.00 26.00 2.21 0.22 0.00 26.30 2.21 0.22 0.00 26.60 2.21 0.22 0.00 26.90 2.21 0.22 0.00 27.20 2.21 0.22 0.00 27.50 2.21 0.22 0.00 27.80 2.21 0.22 0.00 28.10 2.21 0.22 0.00 28.40 2.21 0.22 0.00 28.70 2.21 0.22 0.00 29.00 2.21 0.22 0.00 29.30 2.21 0.22 0.00 29.60 2.21 0.22 0.00 29.90 2.21 0.22 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 23HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 30S: PRE-AREA-04D-1 Runoff = 0.24 cfs @ 12.27 hrs, Volume= 0.038 af, Depth= 0.20" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.15 Area (ac) CN Description 1.780 57 Oak/aspen range, Fair, HSG C 0.365 71 Meadow, non-grazed, HSG C 0.075 98 Paved parking, HSG C 2.220 61 Weighted Average 2.145 96.62% Pervious Area 0.075 3.38% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 91 0.0785 1.50 Sheet Flow, Driveway Pavement Smooth surfaces n= 0.011 P2= 1.33" 21.8 109 0.2746 0.08 Sheet Flow, Oak Brush Woods: Dense underbrush n= 0.800 P2= 1.33" 1.2 88 0.2304 1.20 Shallow Concentrated Flow, Oak Brush Forest w/Heavy Litter Kv= 2.5 fps 0.8 225 0.0917 4.76 1.52 Trap/Vee/Rect Channel Flow, Old Irrigation Ditch (Reach 05E) Bot.W=0.00' D=0.40' Z= 2.0 '/' Top.W=1.60' n= 0.030 Earth, grassed & winding 0.2 61 0.0559 4.49 3.37 Trap/Vee/Rect Channel Flow, Old Irrigation Ditch (Reach 05F) Bot.W=0.00' D=0.50' Z= 3.0 '/' Top.W=3.00' n= 0.030 Earth, grassed & winding 25.0 574 Total Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 24HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcatchment 30S: PRE-AREA-04D-1 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr 25-YR Rainfall=2.21" Ia/S=0.15 Runoff Area=2.220 ac Runoff Volume=0.038 af Runoff Depth=0.20" Flow Length=574' Tc=25.0 min CN=61 0.24 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 25HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 30S: PRE-AREA-04D-1 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.14 0.00 0.00 5.30 0.15 0.00 0.00 5.60 0.16 0.00 0.00 5.90 0.17 0.00 0.00 6.20 0.18 0.00 0.00 6.50 0.20 0.00 0.00 6.80 0.21 0.00 0.00 7.10 0.22 0.00 0.00 7.40 0.24 0.00 0.00 7.70 0.25 0.00 0.00 8.00 0.27 0.00 0.00 8.30 0.28 0.00 0.00 8.60 0.30 0.00 0.00 8.90 0.32 0.00 0.00 9.20 0.34 0.00 0.00 9.50 0.36 0.00 0.00 9.80 0.38 0.00 0.00 10.10 0.41 0.00 0.00 10.40 0.44 0.00 0.00 10.70 0.48 0.00 0.00 11.00 0.52 0.00 0.00 11.30 0.58 0.00 0.00 11.60 0.68 0.00 0.00 11.90 1.25 0.01 0.00 12.20 1.54 0.05 0.23 12.50 1.62 0.06 0.16 12.80 1.68 0.07 0.10 13.10 1.72 0.08 0.07 13.40 1.76 0.09 0.06 13.70 1.79 0.09 0.05 14.00 1.81 0.10 0.05 14.30 1.84 0.11 0.04 14.60 1.86 0.11 0.04 14.90 1.88 0.12 0.04 15.20 1.90 0.12 0.04 15.50 1.92 0.12 0.03 15.80 1.93 0.13 0.03 16.10 1.95 0.13 0.03 16.40 1.96 0.14 0.03 16.70 1.98 0.14 0.03 17.00 1.99 0.14 0.03 17.30 2.01 0.15 0.03 17.60 2.02 0.15 0.03 17.90 2.03 0.15 0.03 18.20 2.04 0.16 0.02 18.50 2.05 0.16 0.02 18.80 2.07 0.16 0.02 19.10 2.08 0.17 0.02 19.40 2.09 0.17 0.02 19.70 2.10 0.17 0.02 20.00 2.10 0.17 0.02 20.30 2.11 0.18 0.02 20.60 2.12 0.18 0.02 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.13 0.18 0.02 21.20 2.14 0.18 0.02 21.50 2.15 0.19 0.02 21.80 2.15 0.19 0.02 22.10 2.16 0.19 0.02 22.40 2.17 0.19 0.02 22.70 2.18 0.20 0.02 23.00 2.19 0.20 0.02 23.30 2.19 0.20 0.02 23.60 2.20 0.20 0.02 23.90 2.21 0.20 0.02 24.20 2.21 0.20 0.01 24.50 2.21 0.20 0.00 24.80 2.21 0.20 0.00 25.10 2.21 0.20 0.00 25.40 2.21 0.20 0.00 25.70 2.21 0.20 0.00 26.00 2.21 0.20 0.00 26.30 2.21 0.20 0.00 26.60 2.21 0.20 0.00 26.90 2.21 0.20 0.00 27.20 2.21 0.20 0.00 27.50 2.21 0.20 0.00 27.80 2.21 0.20 0.00 28.10 2.21 0.20 0.00 28.40 2.21 0.20 0.00 28.70 2.21 0.20 0.00 29.00 2.21 0.20 0.00 29.30 2.21 0.20 0.00 29.60 2.21 0.20 0.00 29.90 2.21 0.20 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 26HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 32S: PRE-AREA-04D-2 Runoff = 0.11 cfs @ 12.38 hrs, Volume= 0.025 af, Depth= 0.15" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.15 Area (ac) CN Description 1.905 57 Oak/aspen range, Fair, HSG C 0.000 71 Meadow, non-grazed, HSG C 0.055 98 Paved parking, HSG C 1.960 58 Weighted Average 1.905 97.19% Pervious Area 0.055 2.81% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.6 51 0.0757 1.32 Sheet Flow, Driveway Pavement Smooth surfaces n= 0.011 P2= 1.33" 25.6 150 0.3485 0.10 Sheet Flow, Oak Brush Woods: Dense underbrush n= 0.800 P2= 1.33" 0.7 77 0.4857 1.74 Shallow Concentrated Flow, Oak Brush Forest w/Heavy Litter Kv= 2.5 fps 0.7 99 0.0614 2.23 0.54 Trap/Vee/Rect Channel Flow, Channel along old RR Grade Bot.W=0.00' D=0.20' Z= 2.0 & 10.0 '/' Top.W=2.40' n= 0.035 Earth, dense weeds 1.1 186 0.3693 2.82 0.92 Trap/Vee/Rect Channel Flow, Swale down Oak Brush slope Bot.W=4.00' D=0.05' Z= 50.0 '/' Top.W=9.00' n= 0.035 Earth, dense weeds 0.4 54 0.0242 2.32 1.89 Trap/Vee/Rect Channel Flow, Old Irrigation Ditch (Reach 05G) Bot.W=0.00' D=0.54' Z= 3.1 & 2.5 '/' Top.W=3.02' n= 0.040 Earth, cobble bottom, clean sides 0.5 90 0.0445 3.01 2.64 Trap/Vee/Rect Channel Flow, Old Irrigation Ditch (Reach 05H) Bot.W=0.00' D=0.50' Z= 2.0 & 5.0 '/' Top.W=3.50' n= 0.040 Earth, cobble bottom, clean sides 29.6 707 Total Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 27HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcatchment 32S: PRE-AREA-04D-2 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.12 0.115 0.11 0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type II 24-hr 25-YR Rainfall=2.21" Ia/S=0.15 Runoff Area=1.960 ac Runoff Volume=0.025 af Runoff Depth=0.15" Flow Length=707' Tc=29.6 min CN=58 0.11 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 28HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 32S: PRE-AREA-04D-2 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.14 0.00 0.00 5.30 0.15 0.00 0.00 5.60 0.16 0.00 0.00 5.90 0.17 0.00 0.00 6.20 0.18 0.00 0.00 6.50 0.20 0.00 0.00 6.80 0.21 0.00 0.00 7.10 0.22 0.00 0.00 7.40 0.24 0.00 0.00 7.70 0.25 0.00 0.00 8.00 0.27 0.00 0.00 8.30 0.28 0.00 0.00 8.60 0.30 0.00 0.00 8.90 0.32 0.00 0.00 9.20 0.34 0.00 0.00 9.50 0.36 0.00 0.00 9.80 0.38 0.00 0.00 10.10 0.41 0.00 0.00 10.40 0.44 0.00 0.00 10.70 0.48 0.00 0.00 11.00 0.52 0.00 0.00 11.30 0.58 0.00 0.00 11.60 0.68 0.00 0.00 11.90 1.25 0.00 0.00 12.20 1.54 0.03 0.07 12.50 1.62 0.04 0.10 12.80 1.68 0.04 0.07 13.10 1.72 0.05 0.05 13.40 1.76 0.06 0.04 13.70 1.79 0.06 0.04 14.00 1.81 0.07 0.03 14.30 1.84 0.07 0.03 14.60 1.86 0.07 0.03 14.90 1.88 0.08 0.03 15.20 1.90 0.08 0.03 15.50 1.92 0.09 0.02 15.80 1.93 0.09 0.02 16.10 1.95 0.09 0.02 16.40 1.96 0.10 0.02 16.70 1.98 0.10 0.02 17.00 1.99 0.10 0.02 17.30 2.01 0.10 0.02 17.60 2.02 0.11 0.02 17.90 2.03 0.11 0.02 18.20 2.04 0.11 0.02 18.50 2.05 0.11 0.02 18.80 2.07 0.12 0.02 19.10 2.08 0.12 0.02 19.40 2.09 0.12 0.02 19.70 2.10 0.12 0.01 20.00 2.10 0.13 0.01 20.30 2.11 0.13 0.01 20.60 2.12 0.13 0.01 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.13 0.13 0.01 21.20 2.14 0.13 0.01 21.50 2.15 0.14 0.01 21.80 2.15 0.14 0.01 22.10 2.16 0.14 0.01 22.40 2.17 0.14 0.01 22.70 2.18 0.14 0.01 23.00 2.19 0.14 0.01 23.30 2.19 0.15 0.01 23.60 2.20 0.15 0.01 23.90 2.21 0.15 0.01 24.20 2.21 0.15 0.01 24.50 2.21 0.15 0.00 24.80 2.21 0.15 0.00 25.10 2.21 0.15 0.00 25.40 2.21 0.15 0.00 25.70 2.21 0.15 0.00 26.00 2.21 0.15 0.00 26.30 2.21 0.15 0.00 26.60 2.21 0.15 0.00 26.90 2.21 0.15 0.00 27.20 2.21 0.15 0.00 27.50 2.21 0.15 0.00 27.80 2.21 0.15 0.00 28.10 2.21 0.15 0.00 28.40 2.21 0.15 0.00 28.70 2.21 0.15 0.00 29.00 2.21 0.15 0.00 29.30 2.21 0.15 0.00 29.60 2.21 0.15 0.00 29.90 2.21 0.15 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 29HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 9R: Reach 7A-6 Inflow = 0.06 cfs @ 12.85 hrs, Volume= 0.004 af Outflow = 0.06 cfs @ 12.92 hrs, Volume= 0.004 af, Atten= 4%, Lag= 4.0 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 1.96 fps, Min. Travel Time= 5.3 min Avg. Velocity = 1.10 fps, Avg. Travel Time= 9.5 min Peak Storage= 20 cf @ 12.92 hrs Average Depth at Peak Storage= 0.11' , Surface Width= 0.56' Bank-Full Depth= 1.00' Flow Area= 2.5 sf, Capacity= 21.00 cfs 0.00' x 1.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 2.5 '/' Top Width= 5.00' Length= 626.8' Slope= 0.0800 '/' Inlet Invert= 6,994.87', Outlet Invert= 6,944.72' Reach 9R: Reach 7A-6 Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Avg. Flow Depth=0.11' Max Vel=1.96 fps n=0.030 L=626.8' S=0.0800 '/' Capacity=21.00 cfs 0.06 cfs 0.06 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 30HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 9R: Reach 7A-6 Primary Stage-Discharge Discharge (cfs) 20181614121086420Depth (feet)1 0 Reach 9R: Reach 7A-6 Storage Stage-Storage Storage (cubic-feet) 1,5001,4001,3001,2001,1001,0009008007006005004003002001000Depth (feet)1 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 31HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 9R: Reach 7A-6 Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,994.87 0.00 5.60 0.00 0 6,994.87 0.00 6.20 0.00 0 6,994.87 0.00 6.80 0.00 0 6,994.87 0.00 7.40 0.00 0 6,994.87 0.00 8.00 0.00 0 6,994.87 0.00 8.60 0.00 0 6,994.87 0.00 9.20 0.00 0 6,994.87 0.00 9.80 0.00 0 6,994.87 0.00 10.40 0.00 0 6,994.87 0.00 11.00 0.00 0 6,994.87 0.00 11.60 0.00 0 6,994.87 0.00 12.20 0.00 0 6,994.87 0.00 12.80 0.06 18 6,994.98 0.05 13.40 0.02 11 6,994.95 0.03 14.00 0.00 1 6,994.90 0.00 14.60 0.00 0 6,994.88 0.00 15.20 0.00 0 6,994.87 0.00 15.80 0.00 0 6,994.87 0.00 16.40 0.00 0 6,994.87 0.00 17.00 0.00 0 6,994.87 0.00 17.60 0.00 0 6,994.87 0.00 18.20 0.00 0 6,994.87 0.00 18.80 0.00 0 6,994.87 0.00 19.40 0.00 0 6,994.87 0.00 20.00 0.00 0 6,994.87 0.00 20.60 0.00 0 6,994.87 0.00 21.20 0.00 0 6,994.87 0.00 21.80 0.00 0 6,994.87 0.00 22.40 0.00 0 6,994.87 0.00 23.00 0.00 0 6,994.87 0.00 23.60 0.00 0 6,994.87 0.00 24.20 0.00 0 6,994.87 0.00 24.80 0.00 0 6,994.87 0.00 25.40 0.00 0 6,994.87 0.00 26.00 0.00 0 6,994.87 0.00 26.60 0.00 0 6,994.87 0.00 27.20 0.00 0 6,994.87 0.00 27.80 0.00 0 6,994.87 0.00 28.40 0.00 0 6,994.87 0.00 29.00 0.00 0 6,994.87 0.00 29.60 0.00 0 6,994.87 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 32HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 9R: Reach 7A-6 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,994.87 0.00 0.00 6,994.88 0.39 0.00 6,994.89 0.62 0.00 6,994.90 0.81 0.00 6,994.91 0.98 0.00 6,994.92 1.14 0.01 6,994.93 1.29 0.01 6,994.94 1.43 0.02 6,994.95 1.56 0.02 6,994.96 1.69 0.03 6,994.97 1.81 0.05 6,994.98 1.93 0.06 6,994.99 2.04 0.07 6,995.00 2.16 0.09 6,995.01 2.26 0.11 6,995.02 2.37 0.13 6,995.03 2.48 0.16 6,995.04 2.58 0.19 6,995.05 2.68 0.22 6,995.06 2.78 0.25 6,995.07 2.87 0.29 6,995.08 2.97 0.33 6,995.09 3.06 0.37 6,995.10 3.15 0.42 6,995.11 3.24 0.47 6,995.12 3.33 0.52 6,995.13 3.42 0.58 6,995.14 3.51 0.64 6,995.15 3.60 0.70 6,995.16 3.68 0.77 6,995.17 3.76 0.85 6,995.18 3.85 0.92 6,995.19 3.93 1.01 6,995.20 4.01 1.09 6,995.21 4.09 1.18 6,995.22 4.17 1.28 6,995.23 4.25 1.38 6,995.24 4.33 1.48 6,995.25 4.41 1.59 6,995.26 4.48 1.71 6,995.27 4.56 1.82 6,995.28 4.64 1.95 6,995.29 4.71 2.08 6,995.30 4.79 2.21 6,995.31 4.86 2.35 6,995.32 4.93 2.50 6,995.33 5.01 2.65 6,995.34 5.08 2.80 6,995.35 5.15 2.97 6,995.36 5.22 3.13 6,995.37 5.29 3.31 6,995.38 5.36 3.49 6,995.39 5.43 3.67 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,995.40 5.50 3.86 6,995.41 5.57 4.06 6,995.42 5.64 4.26 6,995.43 5.71 4.47 6,995.44 5.77 4.69 6,995.45 5.84 4.91 6,995.46 5.91 5.14 6,995.47 5.98 5.38 6,995.48 6.04 5.62 6,995.49 6.11 5.87 6,995.50 6.17 6.13 6,995.51 6.24 6.39 6,995.52 6.30 6.66 6,995.53 6.37 6.93 6,995.54 6.43 7.22 6,995.55 6.50 7.51 6,995.56 6.56 7.81 6,995.57 6.62 8.11 6,995.58 6.69 8.43 6,995.59 6.75 8.75 6,995.60 6.81 9.07 6,995.61 6.87 9.41 6,995.62 6.93 9.75 6,995.63 7.00 10.10 6,995.64 7.06 10.46 6,995.65 7.12 10.83 6,995.66 7.18 11.20 6,995.67 7.24 11.58 6,995.68 7.30 11.97 6,995.69 7.36 12.37 6,995.70 7.42 12.78 6,995.71 7.48 13.19 6,995.72 7.54 13.62 6,995.73 7.60 14.05 6,995.74 7.66 14.49 6,995.75 7.71 14.93 6,995.76 7.77 15.39 6,995.77 7.83 15.86 6,995.78 7.89 16.33 6,995.79 7.95 16.81 6,995.80 8.00 17.31 6,995.81 8.06 17.81 6,995.82 8.12 18.32 6,995.83 8.17 18.83 6,995.84 8.23 19.36 6,995.85 8.29 19.90 6,995.86 8.34 20.45 6,995.87 8.40 21.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 33HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 9R: Reach 7A-6 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,994.87 0.0 0 6,994.88 0.0 0 6,994.89 0.0 1 6,994.90 0.0 1 6,994.91 0.0 3 6,994.92 0.0 4 6,994.93 0.0 6 6,994.94 0.0 8 6,994.95 0.0 10 6,994.96 0.0 13 6,994.97 0.0 16 6,994.98 0.0 19 6,994.99 0.0 23 6,995.00 0.0 26 6,995.01 0.0 31 6,995.02 0.1 35 6,995.03 0.1 40 6,995.04 0.1 45 6,995.05 0.1 51 6,995.06 0.1 57 6,995.07 0.1 63 6,995.08 0.1 69 6,995.09 0.1 76 6,995.10 0.1 83 6,995.11 0.1 90 6,995.12 0.2 98 6,995.13 0.2 106 6,995.14 0.2 114 6,995.15 0.2 123 6,995.16 0.2 132 6,995.17 0.2 141 6,995.18 0.2 151 6,995.19 0.3 160 6,995.20 0.3 171 6,995.21 0.3 181 6,995.22 0.3 192 6,995.23 0.3 203 6,995.24 0.3 215 6,995.25 0.4 226 6,995.26 0.4 238 6,995.27 0.4 251 6,995.28 0.4 263 6,995.29 0.4 276 6,995.30 0.5 290 6,995.31 0.5 303 6,995.32 0.5 317 6,995.33 0.5 332 6,995.34 0.6 346 6,995.35 0.6 361 6,995.36 0.6 376 6,995.37 0.6 392 6,995.38 0.7 408 6,995.39 0.7 424 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,995.40 0.7 440 6,995.41 0.7 457 6,995.42 0.8 474 6,995.43 0.8 491 6,995.44 0.8 509 6,995.45 0.8 527 6,995.46 0.9 545 6,995.47 0.9 564 6,995.48 0.9 583 6,995.49 1.0 602 6,995.50 1.0 622 6,995.51 1.0 642 6,995.52 1.1 662 6,995.53 1.1 683 6,995.54 1.1 703 6,995.55 1.2 725 6,995.56 1.2 746 6,995.57 1.2 768 6,995.58 1.3 790 6,995.59 1.3 812 6,995.60 1.3 835 6,995.61 1.4 858 6,995.62 1.4 881 6,995.63 1.4 905 6,995.64 1.5 929 6,995.65 1.5 953 6,995.66 1.6 978 6,995.67 1.6 1,003 6,995.68 1.6 1,028 6,995.69 1.7 1,054 6,995.70 1.7 1,080 6,995.71 1.8 1,106 6,995.72 1.8 1,132 6,995.73 1.8 1,159 6,995.74 1.9 1,186 6,995.75 1.9 1,213 6,995.76 2.0 1,241 6,995.77 2.0 1,269 6,995.78 2.1 1,298 6,995.79 2.1 1,326 6,995.80 2.2 1,355 6,995.81 2.2 1,385 6,995.82 2.3 1,414 6,995.83 2.3 1,444 6,995.84 2.4 1,474 6,995.85 2.4 1,505 6,995.86 2.5 1,536 6,995.87 2.5 1,567 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 34HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 13R: PRE-AREA-06-CULVERT [52] Hint: Inlet/Outlet conditions not evaluated [62] Hint: Exceeded Reach 9R OUTLET depth by 0.74' @ 19.55 hrs Inflow Area = 76.472 ac, 0.00% Impervious, Inflow Depth = 0.02" for 25-YR event Inflow = 0.14 cfs @ 19.55 hrs, Volume= 0.109 af Outflow = 0.14 cfs @ 19.55 hrs, Volume= 0.109 af, Atten= 0%, Lag= 0.2 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 1.33 fps, Min. Travel Time= 0.4 min Avg. Velocity = 0.98 fps, Avg. Travel Time= 0.5 min Peak Storage= 3 cf @ 19.55 hrs Average Depth at Peak Storage= 0.74' above invert (0.07' above fill) , Surface Width= 1.50' Bank-Full Depth= 1.50' above invert (0.83' above fill) Flow Area= 1.0 sf, Capacity= 3.37 cfs 18.0" Round Pipe w/ 8.0" inside fill n= 0.025 Corrugated metal Length= 30.0' Slope= 0.0200 '/' (101 Elevation Intervals) Inlet Invert= 6,944.72', Outlet Invert= 6,944.12' Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 35HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 13R: PRE-AREA-06-CULVERT Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=76.472 ac Avg. Flow Depth=0.07' Max Vel=1.33 fps 18.0" Round Pipe w/ 8.0" inside fill n=0.025 L=30.0' S=0.0200 '/' Capacity=3.37 cfs 0.14 cfs0.14 cfs Reach 13R: PRE-AREA-06-CULVERT Primary Stage-Discharge Discharge (cfs) 3210Depth (feet)1 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 36HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 13R: PRE-AREA-06-CULVERT Storage Stage-Storage Storage (cubic-feet) 302826242220181614121086420Depth (feet)1 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 37HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 13R: PRE-AREA-06-CULVERT Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,945.39 0.00 5.60 0.00 0 6,945.39 0.00 6.20 0.00 0 6,945.39 0.00 6.80 0.00 0 6,945.39 0.00 7.40 0.00 0 6,945.39 0.00 8.00 0.00 0 6,945.39 0.00 8.60 0.00 0 6,945.39 0.00 9.20 0.00 0 6,945.39 0.00 9.80 0.00 0 6,945.39 0.00 10.40 0.00 0 6,945.39 0.00 11.00 0.00 0 6,945.39 0.00 11.60 0.00 0 6,945.39 0.00 12.20 0.00 0 6,945.39 0.00 12.80 0.05 2 6,945.43 0.05 13.40 0.03 1 6,945.41 0.03 14.00 0.00 0 6,945.39 0.00 14.60 0.01 1 6,945.40 0.01 15.20 0.04 1 6,945.42 0.04 15.80 0.07 2 6,945.43 0.07 16.40 0.09 2 6,945.44 0.09 17.00 0.11 3 6,945.45 0.11 17.60 0.12 3 6,945.45 0.12 18.20 0.13 3 6,945.45 0.13 18.80 0.13 3 6,945.45 0.13 19.40 0.14 3 6,945.46 0.14 20.00 0.14 3 6,945.45 0.14 20.60 0.13 3 6,945.45 0.13 21.20 0.13 3 6,945.45 0.13 21.80 0.13 3 6,945.45 0.13 22.40 0.13 3 6,945.45 0.13 23.00 0.13 3 6,945.45 0.13 23.60 0.13 3 6,945.45 0.13 24.20 0.13 3 6,945.45 0.13 24.80 0.12 3 6,945.45 0.12 25.40 0.07 2 6,945.43 0.07 26.00 0.03 1 6,945.41 0.03 26.60 0.01 1 6,945.40 0.01 27.20 0.00 0 6,945.40 0.00 27.80 0.00 0 6,945.39 0.00 28.40 0.00 0 6,945.39 0.00 29.00 0.00 0 6,945.39 0.00 29.60 0.00 0 6,945.39 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 38HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 13R: PRE-AREA-06-CULVERT Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,944.72 0.00 0.00 6,944.73 0.00 0.00 6,944.74 0.00 0.00 6,944.75 0.00 0.00 6,944.76 0.00 0.00 6,944.77 0.00 0.00 6,944.78 0.00 0.00 6,944.79 0.00 0.00 6,944.80 0.00 0.00 6,944.81 0.00 0.00 6,944.82 0.00 0.00 6,944.83 0.00 0.00 6,944.84 0.00 0.00 6,944.85 0.00 0.00 6,944.86 0.00 0.00 6,944.87 0.00 0.00 6,944.88 0.00 0.00 6,944.89 0.00 0.00 6,944.90 0.00 0.00 6,944.91 0.00 0.00 6,944.92 0.00 0.00 6,944.93 0.00 0.00 6,944.94 0.00 0.00 6,944.95 0.00 0.00 6,944.96 0.00 0.00 6,944.97 0.00 0.00 6,944.98 0.00 0.00 6,944.99 0.00 0.00 6,945.00 0.00 0.00 6,945.01 0.00 0.00 6,945.02 0.00 0.00 6,945.03 0.00 0.00 6,945.04 0.00 0.00 6,945.05 0.00 0.00 6,945.06 0.00 0.00 6,945.07 0.00 0.00 6,945.08 0.00 0.00 6,945.09 0.00 0.00 6,945.10 0.00 0.00 6,945.11 0.00 0.00 6,945.12 0.00 0.00 6,945.13 0.00 0.00 6,945.14 0.00 0.00 6,945.15 0.00 0.00 6,945.16 0.00 0.00 6,945.17 0.00 0.00 6,945.18 0.00 0.00 6,945.19 0.00 0.00 6,945.20 0.00 0.00 6,945.21 0.00 0.00 6,945.22 0.00 0.00 6,945.23 0.00 0.00 6,945.24 0.00 0.00 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,945.25 0.00 0.00 6,945.26 0.00 0.00 6,945.27 0.00 0.00 6,945.28 0.00 0.00 6,945.29 0.00 0.00 6,945.30 0.00 0.00 6,945.31 0.00 0.00 6,945.32 0.00 0.00 6,945.33 0.00 0.00 6,945.34 0.00 0.00 6,945.35 0.00 0.00 6,945.36 0.00 0.00 6,945.37 0.00 0.00 6,945.38 0.00 0.00 6,945.39 0.14 0.00 6,945.40 0.45 0.01 6,945.41 0.67 0.02 6,945.42 0.84 0.04 6,945.43 1.00 0.07 6,945.44 1.14 0.09 6,945.45 1.27 0.12 6,945.46 1.38 0.15 6,945.47 1.50 0.19 6,945.48 1.60 0.22 6,945.49 1.70 0.26 6,945.50 1.80 0.30 6,945.51 1.89 0.35 6,945.52 1.97 0.39 6,945.53 2.05 0.44 6,945.54 2.13 0.49 6,945.55 2.21 0.54 6,945.56 2.28 0.59 6,945.57 2.35 0.64 6,945.58 2.41 0.70 6,945.59 2.48 0.75 6,945.60 2.54 0.81 6,945.61 2.60 0.87 6,945.62 2.66 0.93 6,945.63 2.71 0.98 6,945.64 2.77 1.04 6,945.65 2.82 1.10 6,945.66 2.87 1.17 6,945.67 2.91 1.23 6,945.68 2.96 1.29 6,945.69 3.01 1.35 6,945.70 3.05 1.42 6,945.71 3.09 1.48 6,945.72 3.13 1.54 6,945.73 3.17 1.61 6,945.74 3.21 1.67 6,945.75 3.24 1.73 6,945.76 3.28 1.80 6,945.77 3.31 1.86 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,945.78 3.34 1.93 6,945.79 3.37 1.99 6,945.80 3.40 2.05 6,945.81 3.43 2.12 6,945.82 3.46 2.18 6,945.83 3.49 2.24 6,945.84 3.51 2.30 6,945.85 3.53 2.37 6,945.86 3.56 2.43 6,945.87 3.58 2.49 6,945.88 3.60 2.55 6,945.89 3.62 2.61 6,945.90 3.64 2.66 6,945.91 3.65 2.72 6,945.92 3.67 2.78 6,945.93 3.68 2.83 6,945.94 3.70 2.89 6,945.95 3.71 2.94 6,945.96 3.72 2.99 6,945.97 3.73 3.04 6,945.98 3.74 3.09 6,945.99 3.75 3.14 6,946.00 3.76 3.18 6,946.01 3.76 3.23 6,946.02 3.77 3.27 6,946.03 3.77 3.31 6,946.04 3.77 3.35 6,946.05 3.77 3.39 6,946.06 3.77 3.42 6,946.07 3.77 3.46 6,946.08 3.77 3.49 6,946.09 3.76 3.51 6,946.10 3.76 3.54 6,946.11 3.75 3.56 6,946.12 3.74 3.58 6,946.13 3.72 3.59 6,946.14 3.71 3.61 6,946.15 3.69 3.61 6,946.16 3.67 3.62 6,946.17 3.65 3.61 6,946.18 3.62 3.60 6,946.19 3.59 3.59 6,946.20 3.54 3.55 6,946.21 3.46 3.48 6,946.22 3.35 3.37 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 39HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 13R: PRE-AREA-06-CULVERT Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,944.72 0.0 0 6,944.74 0.0 0 6,944.76 0.0 0 6,944.78 0.0 0 6,944.80 0.0 0 6,944.82 0.0 0 6,944.84 0.0 0 6,944.86 0.0 0 6,944.88 0.0 0 6,944.90 0.0 0 6,944.92 0.0 0 6,944.94 0.0 0 6,944.96 0.0 0 6,944.98 0.0 0 6,945.00 0.0 0 6,945.02 0.0 0 6,945.04 0.0 0 6,945.06 0.0 0 6,945.08 0.0 0 6,945.10 0.0 0 6,945.12 0.0 0 6,945.14 0.0 0 6,945.16 0.0 0 6,945.18 0.0 0 6,945.20 0.0 0 6,945.22 0.0 0 6,945.24 0.0 0 6,945.26 0.0 0 6,945.28 0.0 0 6,945.30 0.0 0 6,945.32 0.0 0 6,945.34 0.0 0 6,945.36 0.0 0 6,945.38 0.0 0 6,945.40 0.0 1 6,945.42 0.0 1 6,945.44 0.1 2 6,945.46 0.1 3 6,945.48 0.1 4 6,945.50 0.2 5 6,945.52 0.2 6 6,945.54 0.2 7 6,945.56 0.3 8 6,945.58 0.3 9 6,945.60 0.3 10 6,945.62 0.3 10 6,945.64 0.4 11 6,945.66 0.4 12 6,945.68 0.4 13 6,945.70 0.5 14 6,945.72 0.5 15 6,945.74 0.5 16 6,945.76 0.5 16 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,945.78 0.6 17 6,945.80 0.6 18 6,945.82 0.6 19 6,945.84 0.7 20 6,945.86 0.7 20 6,945.88 0.7 21 6,945.90 0.7 22 6,945.92 0.8 23 6,945.94 0.8 23 6,945.96 0.8 24 6,945.98 0.8 25 6,946.00 0.8 25 6,946.02 0.9 26 6,946.04 0.9 27 6,946.06 0.9 27 6,946.08 0.9 28 6,946.10 0.9 28 6,946.12 1.0 29 6,946.14 1.0 29 6,946.16 1.0 30 6,946.18 1.0 30 6,946.20 1.0 30 6,946.22 1.0 30 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 40HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 14R: Reach-07A Inflow Area = 5.631 ac, 0.00% Impervious, Inflow Depth = 0.13" for 25-YR event Inflow = 0.12 cfs @ 12.85 hrs, Volume= 0.060 af Outflow = 0.12 cfs @ 12.90 hrs, Volume= 0.060 af, Atten= 0%, Lag= 2.6 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 1.42 fps, Min. Travel Time= 4.2 min Avg. Velocity = 0.98 fps, Avg. Travel Time= 6.0 min Peak Storage= 29 cf @ 12.90 hrs Average Depth at Peak Storage= 0.02' , Surface Width= 5.69' Bank-Full Depth= 0.25' Flow Area= 4.1 sf, Capacity= 26.97 cfs 4.00' x 0.25' deep channel, n= 0.035 Earth, dense weeds Side Slope Z-value= 50.0 '/' Top Width= 29.00' Length= 355.0' Slope= 0.3195 '/' Inlet Invert= 6,991.77', Outlet Invert= 6,878.33' ‡ Reach 14R: Reach-07A Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=5.631 ac Avg. Flow Depth=0.02' Max Vel=1.42 fps n=0.035 L=355.0' S=0.3195 '/' Capacity=26.97 cfs 0.12 cfs0.12 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 41HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 14R: Reach-07A Primary Stage-Discharge Discharge (cfs) 26242220181614121086420Depth (feet)0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Reach 14R: Reach-07A Storage Stage-Storage Storage (cubic-feet) 1,4001,2001,0008006004002000Depth (feet)0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 42HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 14R: Reach-07A Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,991.77 0.00 5.60 0.00 0 6,991.77 0.00 6.20 0.00 0 6,991.77 0.00 6.80 0.00 0 6,991.77 0.00 7.40 0.00 0 6,991.77 0.00 8.00 0.00 0 6,991.77 0.00 8.60 0.00 0 6,991.77 0.00 9.20 0.00 0 6,991.77 0.00 9.80 0.00 0 6,991.77 0.00 10.40 0.00 0 6,991.77 0.00 11.00 0.00 0 6,991.77 0.00 11.60 0.00 0 6,991.77 0.00 12.20 0.03 6 6,991.77 0.01 12.80 0.12 29 6,991.79 0.12 13.40 0.11 29 6,991.79 0.12 14.00 0.10 27 6,991.79 0.11 14.60 0.08 24 6,991.78 0.09 15.20 0.07 21 6,991.78 0.07 15.80 0.07 20 6,991.78 0.07 16.40 0.06 19 6,991.78 0.06 17.00 0.05 18 6,991.78 0.05 17.60 0.05 17 6,991.78 0.05 18.20 0.05 16 6,991.78 0.05 18.80 0.05 16 6,991.78 0.05 19.40 0.04 15 6,991.78 0.04 20.00 0.04 14 6,991.78 0.04 20.60 0.04 14 6,991.78 0.04 21.20 0.04 13 6,991.78 0.04 21.80 0.03 13 6,991.78 0.03 22.40 0.03 13 6,991.78 0.03 23.00 0.03 13 6,991.78 0.03 23.60 0.03 13 6,991.78 0.03 24.20 0.03 13 6,991.78 0.03 24.80 0.02 9 6,991.78 0.02 25.40 0.00 4 6,991.77 0.00 26.00 0.00 1 6,991.77 0.00 26.60 0.00 0 6,991.77 0.00 27.20 0.00 0 6,991.77 0.00 27.80 0.00 0 6,991.77 0.00 28.40 0.00 0 6,991.77 0.00 29.00 0.00 0 6,991.77 0.00 29.60 0.00 0 6,991.77 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 43HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 14R: Reach-07A Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,991.77 0.00 0.00 6,991.78 1.04 0.05 6,991.79 1.57 0.16 6,991.80 1.97 0.33 6,991.81 2.32 0.56 6,991.82 2.62 0.85 6,991.83 2.90 1.22 6,991.84 3.16 1.66 6,991.85 3.40 2.18 6,991.86 3.63 2.78 6,991.87 3.85 3.47 6,991.88 4.06 4.25 6,991.89 4.27 5.12 6,991.90 4.47 6.10 6,991.91 4.66 7.18 6,991.92 4.85 8.36 6,991.93 5.03 9.66 6,991.94 5.21 11.07 6,991.95 5.39 12.61 6,991.96 5.56 14.26 6,991.97 5.73 16.04 6,991.98 5.90 17.96 6,991.99 6.06 20.00 6,992.00 6.22 22.18 6,992.01 6.38 24.51 6,992.02 6.54 26.97 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 44HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 14R: Reach-07A Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,991.77 0.0 0 6,991.78 0.0 16 6,991.79 0.1 36 6,991.80 0.2 59 6,991.81 0.2 85 6,991.82 0.3 115 6,991.83 0.4 149 6,991.84 0.5 186 6,991.85 0.6 227 6,991.86 0.8 272 6,991.87 0.9 320 6,991.88 1.0 371 6,991.89 1.2 426 6,991.90 1.4 485 6,991.91 1.5 547 6,991.92 1.7 612 6,991.93 1.9 682 6,991.94 2.1 754 6,991.95 2.3 831 6,991.96 2.6 911 6,991.97 2.8 994 6,991.98 3.0 1,081 6,991.99 3.3 1,172 6,992.00 3.6 1,266 6,992.01 3.8 1,363 6,992.02 4.1 1,464 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 45HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 15R: Reach-06 [61] Hint: Exceeded Reach 13R outlet invert by 0.02' @ 19.58 hrs Inflow Area = 76.472 ac, 0.00% Impervious, Inflow Depth = 0.02" for 25-YR event Inflow = 0.14 cfs @ 19.55 hrs, Volume= 0.109 af Outflow = 0.14 cfs @ 19.58 hrs, Volume= 0.109 af, Atten= 0%, Lag= 1.5 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 1.39 fps, Min. Travel Time= 2.3 min Avg. Velocity = 1.03 fps, Avg. Travel Time= 3.0 min Peak Storage= 18 cf @ 19.58 hrs Average Depth at Peak Storage= 0.02' , Surface Width= 5.96' Bank-Full Depth= 0.25' Flow Area= 4.1 sf, Capacity= 24.22 cfs 4.00' x 0.25' deep channel, n= 0.035 Earth, dense weeds Side Slope Z-value= 50.0 '/' Top Width= 29.00' Length= 188.3' Slope= 0.2577 '/' Inlet Invert= 6,944.12', Outlet Invert= 6,895.60' ‡ Reach 15R: Reach-06 Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=76.472 ac Avg. Flow Depth=0.02' Max Vel=1.39 fps n=0.035 L=188.3' S=0.2577 '/' Capacity=24.22 cfs 0.14 cfs0.14 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 46HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 15R: Reach-06 Primary Stage-Discharge Discharge (cfs) 242220181614121086420Depth (feet)0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Reach 15R: Reach-06 Storage Stage-Storage Storage (cubic-feet) 7006005004003002001000Depth (feet)0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 47HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 15R: Reach-06 Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,944.12 0.00 5.60 0.00 0 6,944.12 0.00 6.20 0.00 0 6,944.12 0.00 6.80 0.00 0 6,944.12 0.00 7.40 0.00 0 6,944.12 0.00 8.00 0.00 0 6,944.12 0.00 8.60 0.00 0 6,944.12 0.00 9.20 0.00 0 6,944.12 0.00 9.80 0.00 0 6,944.12 0.00 10.40 0.00 0 6,944.12 0.00 11.00 0.00 0 6,944.12 0.00 11.60 0.00 0 6,944.12 0.00 12.20 0.00 0 6,944.12 0.00 12.80 0.05 9 6,944.13 0.05 13.40 0.03 7 6,944.13 0.03 14.00 0.00 2 6,944.12 0.00 14.60 0.01 3 6,944.12 0.01 15.20 0.04 8 6,944.13 0.04 15.80 0.07 12 6,944.13 0.07 16.40 0.09 14 6,944.14 0.09 17.00 0.11 16 6,944.14 0.11 17.60 0.12 17 6,944.14 0.12 18.20 0.13 18 6,944.14 0.13 18.80 0.13 18 6,944.14 0.13 19.40 0.14 18 6,944.14 0.14 20.00 0.14 18 6,944.14 0.14 20.60 0.13 18 6,944.14 0.13 21.20 0.13 18 6,944.14 0.13 21.80 0.13 18 6,944.14 0.13 22.40 0.13 18 6,944.14 0.13 23.00 0.13 18 6,944.14 0.13 23.60 0.13 18 6,944.14 0.13 24.20 0.13 18 6,944.14 0.13 24.80 0.12 17 6,944.14 0.12 25.40 0.07 12 6,944.13 0.07 26.00 0.03 7 6,944.13 0.03 26.60 0.01 4 6,944.12 0.01 27.20 0.00 2 6,944.12 0.01 27.80 0.00 1 6,944.12 0.00 28.40 0.00 0 6,944.12 0.00 29.00 0.00 0 6,944.12 0.00 29.60 0.00 0 6,944.12 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 48HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 15R: Reach-06 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,944.12 0.00 0.00 6,944.13 0.93 0.04 6,944.14 1.41 0.14 6,944.15 1.77 0.29 6,944.16 2.08 0.50 6,944.17 2.35 0.77 6,944.18 2.60 1.09 6,944.19 2.84 1.49 6,944.20 3.05 1.95 6,944.21 3.26 2.49 6,944.22 3.46 3.11 6,944.23 3.65 3.81 6,944.24 3.83 4.60 6,944.25 4.01 5.47 6,944.26 4.18 6.44 6,944.27 4.35 7.51 6,944.28 4.52 8.67 6,944.29 4.68 9.94 6,944.30 4.84 11.32 6,944.31 4.99 12.81 6,944.32 5.15 14.41 6,944.33 5.30 16.12 6,944.34 5.44 17.96 6,944.35 5.59 19.92 6,944.36 5.73 22.01 6,944.37 5.87 24.22 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 49HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 15R: Reach-06 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,944.12 0.0 0 6,944.13 0.0 8 6,944.14 0.1 19 6,944.15 0.2 31 6,944.16 0.2 45 6,944.17 0.3 61 6,944.18 0.4 79 6,944.19 0.5 99 6,944.20 0.6 121 6,944.21 0.8 144 6,944.22 0.9 169 6,944.23 1.0 197 6,944.24 1.2 226 6,944.25 1.4 257 6,944.26 1.5 290 6,944.27 1.7 325 6,944.28 1.9 362 6,944.29 2.1 400 6,944.30 2.3 441 6,944.31 2.6 483 6,944.32 2.8 527 6,944.33 3.0 573 6,944.34 3.3 621 6,944.35 3.6 671 6,944.36 3.8 723 6,944.37 4.1 777 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 50HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 16R: PRE-AREA-05-CULVERT [52] Hint: Inlet/Outlet conditions not evaluated Inflow Area = 27.686 ac, 0.00% Impervious, Inflow Depth = 0.02" for 25-YR event Inflow = 0.05 cfs @ 19.78 hrs, Volume= 0.038 af Outflow = 0.05 cfs @ 19.78 hrs, Volume= 0.038 af, Atten= 0%, Lag= 0.2 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 1.65 fps, Min. Travel Time= 0.3 min Avg. Velocity = 1.23 fps, Avg. Travel Time= 0.4 min Peak Storage= 1 cf @ 19.78 hrs Average Depth at Peak Storage= 0.45' above invert (0.03' above fill) , Surface Width= 0.99' Bank-Full Depth= 1.00' above invert (0.58' above fill) Flow Area= 0.5 sf, Capacity= 2.60 cfs 12.0" Round Pipe w/ 5.0" inside fill n= 0.012 Corrugated PP, smooth interior Length= 30.0' Slope= 0.0200 '/' Inlet Invert= 6,923.48', Outlet Invert= 6,922.88' Reach 16R: PRE-AREA-05-CULVERT Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=27.686 ac Avg. Flow Depth=0.03' Max Vel=1.65 fps 12.0" Round Pipe w/ 5.0" inside fill n=0.012 L=30.0' S=0.0200 '/' Capacity=2.60 cfs 0.05 cfs0.05 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 51HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 16R: PRE-AREA-05-CULVERT Primary Stage-Discharge Discharge (cfs) 210Depth (feet)1 0 Reach 16R: PRE-AREA-05-CULVERT Storage Stage-Storage Storage (cubic-feet) 14131211109876543210Depth (feet)1 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 52HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 16R: PRE-AREA-05-CULVERT Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,923.90 0.00 5.60 0.00 0 6,923.90 0.00 6.20 0.00 0 6,923.90 0.00 6.80 0.00 0 6,923.90 0.00 7.40 0.00 0 6,923.90 0.00 8.00 0.00 0 6,923.90 0.00 8.60 0.00 0 6,923.90 0.00 9.20 0.00 0 6,923.90 0.00 9.80 0.00 0 6,923.90 0.00 10.40 0.00 0 6,923.90 0.00 11.00 0.00 0 6,923.90 0.00 11.60 0.00 0 6,923.90 0.00 12.20 0.00 0 6,923.90 0.00 12.80 0.00 0 6,923.90 0.00 13.40 0.00 0 6,923.90 0.00 14.00 0.00 0 6,923.90 0.00 14.60 0.00 0 6,923.90 0.00 15.20 0.01 0 6,923.91 0.01 15.80 0.02 1 6,923.92 0.02 16.40 0.03 1 6,923.92 0.03 17.00 0.04 1 6,923.92 0.04 17.60 0.04 1 6,923.92 0.04 18.20 0.05 1 6,923.93 0.05 18.80 0.05 1 6,923.93 0.05 19.40 0.05 1 6,923.93 0.05 20.00 0.05 1 6,923.93 0.05 20.60 0.05 1 6,923.93 0.05 21.20 0.05 1 6,923.93 0.05 21.80 0.05 1 6,923.93 0.05 22.40 0.05 1 6,923.93 0.05 23.00 0.05 1 6,923.93 0.05 23.60 0.05 1 6,923.93 0.05 24.20 0.05 1 6,923.93 0.05 24.80 0.04 1 6,923.92 0.04 25.40 0.03 1 6,923.92 0.03 26.00 0.01 0 6,923.91 0.01 26.60 0.01 0 6,923.90 0.01 27.20 0.00 0 6,923.90 0.00 27.80 0.00 0 6,923.90 0.00 28.40 0.00 0 6,923.90 0.00 29.00 0.00 0 6,923.90 0.00 29.60 0.00 0 6,923.90 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 53HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 16R: PRE-AREA-05-CULVERT Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,923.48 0.00 0.00 6,923.49 0.00 0.00 6,923.50 0.00 0.00 6,923.51 0.00 0.00 6,923.52 0.00 0.00 6,923.53 0.00 0.00 6,923.54 0.00 0.00 6,923.55 0.00 0.00 6,923.56 0.00 0.00 6,923.57 0.00 0.00 6,923.58 0.00 0.00 6,923.59 0.00 0.00 6,923.60 0.00 0.00 6,923.61 0.00 0.00 6,923.62 0.00 0.00 6,923.63 0.00 0.00 6,923.64 0.00 0.00 6,923.65 0.00 0.00 6,923.66 0.00 0.00 6,923.67 0.00 0.00 6,923.68 0.00 0.00 6,923.69 0.00 0.00 6,923.70 0.00 0.00 6,923.71 0.00 0.00 6,923.72 0.00 0.00 6,923.73 0.00 0.00 6,923.74 0.00 0.00 6,923.75 0.00 0.00 6,923.76 0.00 0.00 6,923.77 0.00 0.00 6,923.78 0.00 0.00 6,923.79 0.00 0.00 6,923.80 0.00 0.00 6,923.81 0.00 0.00 6,923.82 0.00 0.00 6,923.83 0.00 0.00 6,923.84 0.00 0.00 6,923.85 0.00 0.00 6,923.86 0.00 0.00 6,923.87 0.00 0.00 6,923.88 0.00 0.00 6,923.89 0.00 0.00 6,923.90 0.39 0.00 6,923.91 0.97 0.01 6,923.92 1.39 0.03 6,923.93 1.74 0.06 6,923.94 2.05 0.09 6,923.95 2.33 0.12 6,923.96 2.58 0.16 6,923.97 2.81 0.21 6,923.98 3.03 0.25 6,923.99 3.23 0.30 6,924.00 3.42 0.35 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,924.01 3.60 0.41 6,924.02 3.76 0.46 6,924.03 3.92 0.52 6,924.04 4.07 0.58 6,924.05 4.21 0.64 6,924.06 4.35 0.71 6,924.07 4.48 0.77 6,924.08 4.60 0.84 6,924.09 4.71 0.91 6,924.10 4.82 0.97 6,924.11 4.93 1.04 6,924.12 5.03 1.11 6,924.13 5.12 1.18 6,924.14 5.21 1.25 6,924.15 5.30 1.32 6,924.16 5.38 1.39 6,924.17 5.45 1.46 6,924.18 5.53 1.53 6,924.19 5.60 1.60 6,924.20 5.66 1.67 6,924.21 5.72 1.74 6,924.22 5.78 1.81 6,924.23 5.83 1.88 6,924.24 5.88 1.94 6,924.25 5.92 2.01 6,924.26 5.97 2.07 6,924.27 6.00 2.14 6,924.28 6.04 2.20 6,924.29 6.07 2.26 6,924.30 6.10 2.31 6,924.31 6.12 2.37 6,924.32 6.14 2.42 6,924.33 6.15 2.47 6,924.34 6.17 2.52 6,924.35 6.17 2.57 6,924.36 6.17 2.61 6,924.37 6.17 2.65 6,924.38 6.17 2.68 6,924.39 6.15 2.71 6,924.40 6.14 2.74 6,924.41 6.11 2.76 6,924.42 6.08 2.78 6,924.43 6.04 2.79 6,924.44 6.00 2.79 6,924.45 5.94 2.78 6,924.46 5.86 2.76 6,924.47 5.75 2.73 6,924.48 5.47 2.60 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 54HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 16R: PRE-AREA-05-CULVERT Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,923.48 0.0 0 6,923.49 0.0 0 6,923.50 0.0 0 6,923.51 0.0 0 6,923.52 0.0 0 6,923.53 0.0 0 6,923.54 0.0 0 6,923.55 0.0 0 6,923.56 0.0 0 6,923.57 0.0 0 6,923.58 0.0 0 6,923.59 0.0 0 6,923.60 0.0 0 6,923.61 0.0 0 6,923.62 0.0 0 6,923.63 0.0 0 6,923.64 0.0 0 6,923.65 0.0 0 6,923.66 0.0 0 6,923.67 0.0 0 6,923.68 0.0 0 6,923.69 0.0 0 6,923.70 0.0 0 6,923.71 0.0 0 6,923.72 0.0 0 6,923.73 0.0 0 6,923.74 0.0 0 6,923.75 0.0 0 6,923.76 0.0 0 6,923.77 0.0 0 6,923.78 0.0 0 6,923.79 0.0 0 6,923.80 0.0 0 6,923.81 0.0 0 6,923.82 0.0 0 6,923.83 0.0 0 6,923.84 0.0 0 6,923.85 0.0 0 6,923.86 0.0 0 6,923.87 0.0 0 6,923.88 0.0 0 6,923.89 0.0 0 6,923.90 0.0 0 6,923.91 0.0 0 6,923.92 0.0 1 6,923.93 0.0 1 6,923.94 0.0 1 6,923.95 0.1 2 6,923.96 0.1 2 6,923.97 0.1 2 6,923.98 0.1 2 6,923.99 0.1 3 6,924.00 0.1 3 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,924.01 0.1 3 6,924.02 0.1 4 6,924.03 0.1 4 6,924.04 0.1 4 6,924.05 0.2 5 6,924.06 0.2 5 6,924.07 0.2 5 6,924.08 0.2 5 6,924.09 0.2 6 6,924.10 0.2 6 6,924.11 0.2 6 6,924.12 0.2 7 6,924.13 0.2 7 6,924.14 0.2 7 6,924.15 0.2 7 6,924.16 0.3 8 6,924.17 0.3 8 6,924.18 0.3 8 6,924.19 0.3 9 6,924.20 0.3 9 6,924.21 0.3 9 6,924.22 0.3 9 6,924.23 0.3 10 6,924.24 0.3 10 6,924.25 0.3 10 6,924.26 0.3 10 6,924.27 0.4 11 6,924.28 0.4 11 6,924.29 0.4 11 6,924.30 0.4 11 6,924.31 0.4 12 6,924.32 0.4 12 6,924.33 0.4 12 6,924.34 0.4 12 6,924.35 0.4 12 6,924.36 0.4 13 6,924.37 0.4 13 6,924.38 0.4 13 6,924.39 0.4 13 6,924.40 0.4 13 6,924.41 0.5 14 6,924.42 0.5 14 6,924.43 0.5 14 6,924.44 0.5 14 6,924.45 0.5 14 6,924.46 0.5 14 6,924.47 0.5 14 6,924.48 0.5 14 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 55HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 17R: Reach-05A [61] Hint: Exceeded Reach 16R outlet invert by 0.01' @ 19.82 hrs Inflow Area = 27.686 ac, 0.00% Impervious, Inflow Depth > 0.02" for 25-YR event Inflow = 0.05 cfs @ 19.78 hrs, Volume= 0.038 af Outflow = 0.05 cfs @ 19.81 hrs, Volume= 0.038 af, Atten= 0%, Lag= 1.5 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 0.82 fps, Min. Travel Time= 3.5 min Avg. Velocity = 0.63 fps, Avg. Travel Time= 4.6 min Peak Storage= 10 cf @ 19.81 hrs Average Depth at Peak Storage= 0.01' , Surface Width= 5.29' Bank-Full Depth= 0.25' Flow Area= 4.1 sf, Capacity= 18.30 cfs 4.00' x 0.25' deep channel, n= 0.035 Earth, dense weeds Side Slope Z-value= 50.0 '/' Top Width= 29.00' Length= 173.7' Slope= 0.1471 '/' Inlet Invert= 6,922.88', Outlet Invert= 6,897.33' ‡ Reach 17R: Reach-05A Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=27.686 ac Avg. Flow Depth=0.01' Max Vel=0.82 fps n=0.035 L=173.7' S=0.1471 '/' Capacity=18.30 cfs 0.05 cfs0.05 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 56HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 17R: Reach-05A Primary Stage-Discharge Discharge (cfs) 181614121086420Depth (feet)0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Reach 17R: Reach-05A Storage Stage-Storage Storage (cubic-feet) 700650600550500450400350300250200150100500Depth (feet)0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 57HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 17R: Reach-05A Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,922.88 0.00 5.60 0.00 0 6,922.88 0.00 6.20 0.00 0 6,922.88 0.00 6.80 0.00 0 6,922.88 0.00 7.40 0.00 0 6,922.88 0.00 8.00 0.00 0 6,922.88 0.00 8.60 0.00 0 6,922.88 0.00 9.20 0.00 0 6,922.88 0.00 9.80 0.00 0 6,922.88 0.00 10.40 0.00 0 6,922.88 0.00 11.00 0.00 0 6,922.88 0.00 11.60 0.00 0 6,922.88 0.00 12.20 0.00 0 6,922.88 0.00 12.80 0.00 0 6,922.88 0.00 13.40 0.00 0 6,922.88 0.00 14.00 0.00 0 6,922.88 0.00 14.60 0.00 1 6,922.88 0.00 15.20 0.01 4 6,922.89 0.01 15.80 0.02 6 6,922.89 0.02 16.40 0.03 8 6,922.89 0.03 17.00 0.04 9 6,922.89 0.04 17.60 0.04 9 6,922.89 0.04 18.20 0.05 10 6,922.89 0.05 18.80 0.05 10 6,922.89 0.05 19.40 0.05 10 6,922.89 0.05 20.00 0.05 10 6,922.89 0.05 20.60 0.05 10 6,922.89 0.05 21.20 0.05 10 6,922.89 0.05 21.80 0.05 10 6,922.89 0.05 22.40 0.05 10 6,922.89 0.05 23.00 0.05 10 6,922.89 0.05 23.60 0.05 10 6,922.89 0.05 24.20 0.05 10 6,922.89 0.05 24.80 0.04 10 6,922.89 0.04 25.40 0.03 7 6,922.89 0.03 26.00 0.01 5 6,922.89 0.01 26.60 0.01 3 6,922.88 0.01 27.20 0.00 2 6,922.88 0.00 27.80 0.00 1 6,922.88 0.00 28.40 0.00 0 6,922.88 0.00 29.00 0.00 0 6,922.88 0.00 29.60 0.00 0 6,922.88 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 58HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 17R: Reach-05A Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,922.88 0.00 0.00 6,922.89 0.70 0.03 6,922.90 1.06 0.11 6,922.91 1.34 0.22 6,922.92 1.57 0.38 6,922.93 1.78 0.58 6,922.94 1.97 0.83 6,922.95 2.14 1.12 6,922.96 2.31 1.48 6,922.97 2.46 1.88 6,922.98 2.61 2.35 6,922.99 2.76 2.88 6,923.00 2.90 3.47 6,923.01 3.03 4.14 6,923.02 3.16 4.87 6,923.03 3.29 5.67 6,923.04 3.41 6.55 6,923.05 3.54 7.51 6,923.06 3.66 8.55 6,923.07 3.77 9.68 6,923.08 3.89 10.88 6,923.09 4.00 12.18 6,923.10 4.11 13.57 6,923.11 4.22 15.05 6,923.12 4.33 16.63 6,923.13 4.44 18.30 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 59HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 17R: Reach-05A Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,922.88 0.0 0 6,922.89 0.0 8 6,922.90 0.1 17 6,922.91 0.2 29 6,922.92 0.2 42 6,922.93 0.3 56 6,922.94 0.4 73 6,922.95 0.5 91 6,922.96 0.6 111 6,922.97 0.8 133 6,922.98 0.9 156 6,922.99 1.0 182 6,923.00 1.2 208 6,923.01 1.4 237 6,923.02 1.5 267 6,923.03 1.7 300 6,923.04 1.9 334 6,923.05 2.1 369 6,923.06 2.3 406 6,923.07 2.6 446 6,923.08 2.8 486 6,923.09 3.0 529 6,923.10 3.3 573 6,923.11 3.6 619 6,923.12 3.8 667 6,923.13 4.1 717 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 60HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 18R: Reach-05B [62] Hint: Exceeded Reach 17R OUTLET depth by 0.14' @ 12.62 hrs Inflow Area = 28.472 ac, 0.21% Impervious, Inflow Depth > 0.02" for 25-YR event Inflow = 0.06 cfs @ 19.35 hrs, Volume= 0.050 af Outflow = 0.06 cfs @ 19.38 hrs, Volume= 0.050 af, Atten= 0%, Lag= 1.6 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 0.91 fps, Min. Travel Time= 1.9 min Avg. Velocity = 0.73 fps, Avg. Travel Time= 2.4 min Peak Storage= 6 cf @ 19.38 hrs Average Depth at Peak Storage= 0.14' , Surface Width= 0.86' Bank-Full Depth= 1.00' Flow Area= 3.0 sf, Capacity= 9.97 cfs 0.00' x 1.00' deep channel, n= 0.035 Earth, dense weeds Side Slope Z-value= 3.0 '/' Top Width= 6.00' Length= 104.5' Slope= 0.0166 '/' Inlet Invert= 6,897.33', Outlet Invert= 6,895.60' Reach 18R: Reach-05B Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=28.472 ac Avg. Flow Depth=0.14' Max Vel=0.91 fps n=0.035 L=104.5' S=0.0166 '/' Capacity=9.97 cfs 0.06 cfs0.06 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 61HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 18R: Reach-05B Primary Stage-Discharge Discharge (cfs) 9876543210Depth (feet)1 0 Reach 18R: Reach-05B Storage Stage-Storage Storage (cubic-feet) 300280260240220200180160140120100806040200Depth (feet)1 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 62HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 18R: Reach-05B Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,897.33 0.00 5.60 0.00 0 6,897.33 0.00 6.20 0.00 0 6,897.33 0.00 6.80 0.00 0 6,897.33 0.00 7.40 0.00 0 6,897.33 0.00 8.00 0.00 0 6,897.33 0.00 8.60 0.00 0 6,897.33 0.00 9.20 0.00 0 6,897.33 0.00 9.80 0.00 0 6,897.33 0.00 10.40 0.00 0 6,897.33 0.00 11.00 0.00 0 6,897.33 0.00 11.60 0.00 0 6,897.33 0.00 12.20 0.02 2 6,897.41 0.01 12.80 0.04 5 6,897.46 0.04 13.40 0.03 4 6,897.44 0.03 14.00 0.02 3 6,897.42 0.02 14.60 0.02 3 6,897.42 0.02 15.20 0.02 3 6,897.43 0.02 15.80 0.03 4 6,897.45 0.03 16.40 0.04 5 6,897.46 0.04 17.00 0.05 6 6,897.46 0.05 17.60 0.05 6 6,897.47 0.05 18.20 0.05 6 6,897.47 0.05 18.80 0.06 6 6,897.47 0.06 19.40 0.06 6 6,897.47 0.06 20.00 0.06 6 6,897.47 0.06 20.60 0.05 6 6,897.47 0.05 21.20 0.05 6 6,897.47 0.05 21.80 0.05 6 6,897.47 0.05 22.40 0.05 6 6,897.47 0.05 23.00 0.05 6 6,897.47 0.05 23.60 0.05 6 6,897.47 0.05 24.20 0.05 6 6,897.47 0.05 24.80 0.05 6 6,897.46 0.05 25.40 0.03 4 6,897.44 0.03 26.00 0.01 2 6,897.42 0.01 26.60 0.01 1 6,897.39 0.01 27.20 0.00 1 6,897.38 0.00 27.80 0.00 0 6,897.37 0.00 28.40 0.00 0 6,897.36 0.00 29.00 0.00 0 6,897.35 0.00 29.60 0.00 0 6,897.34 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 63HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 18R: Reach-05B Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,897.33 0.00 0.00 6,897.34 0.15 0.00 6,897.35 0.24 0.00 6,897.36 0.32 0.00 6,897.37 0.39 0.00 6,897.38 0.45 0.00 6,897.39 0.51 0.01 6,897.40 0.56 0.01 6,897.41 0.62 0.01 6,897.42 0.67 0.02 6,897.43 0.72 0.02 6,897.44 0.76 0.03 6,897.45 0.81 0.03 6,897.46 0.85 0.04 6,897.47 0.90 0.05 6,897.48 0.94 0.06 6,897.49 0.98 0.08 6,897.50 1.02 0.09 6,897.51 1.06 0.10 6,897.52 1.10 0.12 6,897.53 1.14 0.14 6,897.54 1.17 0.16 6,897.55 1.21 0.18 6,897.56 1.25 0.20 6,897.57 1.28 0.22 6,897.58 1.32 0.25 6,897.59 1.35 0.27 6,897.60 1.39 0.30 6,897.61 1.42 0.33 6,897.62 1.46 0.37 6,897.63 1.49 0.40 6,897.64 1.52 0.44 6,897.65 1.55 0.48 6,897.66 1.59 0.52 6,897.67 1.62 0.56 6,897.68 1.65 0.61 6,897.69 1.68 0.65 6,897.70 1.71 0.70 6,897.71 1.74 0.76 6,897.72 1.77 0.81 6,897.73 1.80 0.87 6,897.74 1.83 0.92 6,897.75 1.86 0.99 6,897.76 1.89 1.05 6,897.77 1.92 1.12 6,897.78 1.95 1.19 6,897.79 1.98 1.26 6,897.80 2.01 1.33 6,897.81 2.04 1.41 6,897.82 2.07 1.49 6,897.83 2.09 1.57 6,897.84 2.12 1.65 6,897.85 2.15 1.74 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,897.86 2.18 1.83 6,897.87 2.20 1.93 6,897.88 2.23 2.02 6,897.89 2.26 2.12 6,897.90 2.28 2.23 6,897.91 2.31 2.33 6,897.92 2.34 2.44 6,897.93 2.36 2.55 6,897.94 2.39 2.67 6,897.95 2.42 2.79 6,897.96 2.44 2.91 6,897.97 2.47 3.03 6,897.98 2.49 3.16 6,897.99 2.52 3.29 6,898.00 2.54 3.43 6,898.01 2.57 3.56 6,898.02 2.59 3.71 6,898.03 2.62 3.85 6,898.04 2.64 4.00 6,898.05 2.67 4.15 6,898.06 2.69 4.31 6,898.07 2.72 4.47 6,898.08 2.74 4.63 6,898.09 2.77 4.79 6,898.10 2.79 4.96 6,898.11 2.82 5.14 6,898.12 2.84 5.32 6,898.13 2.86 5.50 6,898.14 2.89 5.68 6,898.15 2.91 5.87 6,898.16 2.93 6.06 6,898.17 2.96 6.26 6,898.18 2.98 6.46 6,898.19 3.00 6.67 6,898.20 3.03 6.88 6,898.21 3.05 7.09 6,898.22 3.07 7.31 6,898.23 3.10 7.53 6,898.24 3.12 7.75 6,898.25 3.14 7.98 6,898.26 3.17 8.21 6,898.27 3.19 8.45 6,898.28 3.21 8.69 6,898.29 3.23 8.94 6,898.30 3.26 9.19 6,898.31 3.28 9.44 6,898.32 3.30 9.70 6,898.33 3.32 9.97 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 64HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 18R: Reach-05B Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,897.33 0.0 0 6,897.34 0.0 0 6,897.35 0.0 0 6,897.36 0.0 0 6,897.37 0.0 1 6,897.38 0.0 1 6,897.39 0.0 1 6,897.40 0.0 2 6,897.41 0.0 2 6,897.42 0.0 3 6,897.43 0.0 3 6,897.44 0.0 4 6,897.45 0.0 5 6,897.46 0.1 5 6,897.47 0.1 6 6,897.48 0.1 7 6,897.49 0.1 8 6,897.50 0.1 9 6,897.51 0.1 10 6,897.52 0.1 11 6,897.53 0.1 13 6,897.54 0.1 14 6,897.55 0.1 15 6,897.56 0.2 17 6,897.57 0.2 18 6,897.58 0.2 20 6,897.59 0.2 21 6,897.60 0.2 23 6,897.61 0.2 25 6,897.62 0.3 26 6,897.63 0.3 28 6,897.64 0.3 30 6,897.65 0.3 32 6,897.66 0.3 34 6,897.67 0.3 36 6,897.68 0.4 38 6,897.69 0.4 41 6,897.70 0.4 43 6,897.71 0.4 45 6,897.72 0.5 48 6,897.73 0.5 50 6,897.74 0.5 53 6,897.75 0.5 55 6,897.76 0.6 58 6,897.77 0.6 61 6,897.78 0.6 63 6,897.79 0.6 66 6,897.80 0.7 69 6,897.81 0.7 72 6,897.82 0.7 75 6,897.83 0.8 78 6,897.84 0.8 82 6,897.85 0.8 85 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,897.86 0.8 88 6,897.87 0.9 91 6,897.88 0.9 95 6,897.89 0.9 98 6,897.90 1.0 102 6,897.91 1.0 105 6,897.92 1.0 109 6,897.93 1.1 113 6,897.94 1.1 117 6,897.95 1.2 121 6,897.96 1.2 124 6,897.97 1.2 128 6,897.98 1.3 132 6,897.99 1.3 137 6,898.00 1.3 141 6,898.01 1.4 145 6,898.02 1.4 149 6,898.03 1.5 154 6,898.04 1.5 158 6,898.05 1.6 163 6,898.06 1.6 167 6,898.07 1.6 172 6,898.08 1.7 176 6,898.09 1.7 181 6,898.10 1.8 186 6,898.11 1.8 191 6,898.12 1.9 196 6,898.13 1.9 201 6,898.14 2.0 206 6,898.15 2.0 211 6,898.16 2.1 216 6,898.17 2.1 221 6,898.18 2.2 227 6,898.19 2.2 232 6,898.20 2.3 237 6,898.21 2.3 243 6,898.22 2.4 248 6,898.23 2.4 254 6,898.24 2.5 260 6,898.25 2.5 265 6,898.26 2.6 271 6,898.27 2.7 277 6,898.28 2.7 283 6,898.29 2.8 289 6,898.30 2.8 295 6,898.31 2.9 301 6,898.32 2.9 307 6,898.33 3.0 314 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 65HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 19R: Reach-05C [62] Hint: Exceeded Reach 15R OUTLET depth by 0.19' @ 19.40 hrs [62] Hint: Exceeded Reach 18R OUTLET depth by 0.06' @ 19.61 hrs Inflow Area = 105.736 ac, 0.14% Impervious, Inflow Depth > 0.02" for 25-YR event Inflow = 0.20 cfs @ 19.57 hrs, Volume= 0.173 af Outflow = 0.20 cfs @ 19.58 hrs, Volume= 0.173 af, Atten= 0%, Lag= 0.8 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 1.58 fps, Min. Travel Time= 1.6 min Avg. Velocity = 1.24 fps, Avg. Travel Time= 2.0 min Peak Storage= 19 cf @ 19.58 hrs Average Depth at Peak Storage= 0.21' , Surface Width= 1.23' Bank-Full Depth= 1.00' Flow Area= 3.0 sf, Capacity= 13.65 cfs 0.00' x 1.00' deep channel, n= 0.035 Earth, dense weeds Side Slope Z-value= 3.0 '/' Top Width= 6.00' Length= 148.2' Slope= 0.0310 '/' Inlet Invert= 6,895.60', Outlet Invert= 6,891.00' Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 66HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 19R: Reach-05C Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=105.736 ac Avg. Flow Depth=0.21' Max Vel=1.58 fps n=0.035 L=148.2' S=0.0310 '/' Capacity=13.65 cfs 0.20 cfs0.20 cfs Reach 19R: Reach-05C Primary Stage-Discharge Discharge (cfs) 131211109876543210Depth (feet)1 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 67HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 19R: Reach-05C Storage Stage-Storage Storage (cubic-feet) 400350300250200150100500Depth (feet)1 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 68HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 19R: Reach-05C Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,895.60 0.00 5.60 0.00 0 6,895.60 0.00 6.20 0.00 0 6,895.60 0.00 6.80 0.00 0 6,895.60 0.00 7.40 0.00 0 6,895.60 0.00 8.00 0.00 0 6,895.60 0.00 8.60 0.00 0 6,895.60 0.00 9.20 0.00 0 6,895.60 0.00 9.80 0.00 0 6,895.60 0.00 10.40 0.00 0 6,895.60 0.00 11.00 0.00 0 6,895.60 0.00 11.60 0.00 0 6,895.60 0.00 12.20 0.06 6 6,895.72 0.05 12.80 0.14 14 6,895.78 0.13 13.40 0.08 10 6,895.75 0.09 14.00 0.04 6 6,895.71 0.04 14.60 0.04 5 6,895.71 0.04 15.20 0.07 9 6,895.74 0.07 15.80 0.11 12 6,895.77 0.11 16.40 0.15 15 6,895.78 0.14 17.00 0.17 16 6,895.79 0.17 17.60 0.18 17 6,895.80 0.18 18.20 0.19 18 6,895.80 0.19 18.80 0.20 19 6,895.80 0.20 19.40 0.20 19 6,895.81 0.20 20.00 0.20 19 6,895.80 0.20 20.60 0.19 18 6,895.80 0.19 21.20 0.19 18 6,895.80 0.19 21.80 0.19 18 6,895.80 0.19 22.40 0.19 18 6,895.80 0.19 23.00 0.19 18 6,895.80 0.19 23.60 0.19 18 6,895.80 0.19 24.20 0.19 18 6,895.80 0.19 24.80 0.17 16 6,895.79 0.17 25.40 0.10 11 6,895.76 0.10 26.00 0.04 6 6,895.72 0.05 26.60 0.02 3 6,895.69 0.02 27.20 0.01 2 6,895.66 0.01 27.80 0.00 1 6,895.65 0.00 28.40 0.00 1 6,895.63 0.00 29.00 0.00 0 6,895.62 0.00 29.60 0.00 0 6,895.61 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 69HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 19R: Reach-05C Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,895.60 0.00 0.00 6,895.61 0.21 0.00 6,895.62 0.34 0.00 6,895.63 0.44 0.00 6,895.64 0.53 0.00 6,895.65 0.62 0.00 6,895.66 0.70 0.01 6,895.67 0.77 0.01 6,895.68 0.84 0.02 6,895.69 0.91 0.02 6,895.70 0.98 0.03 6,895.71 1.04 0.04 6,895.72 1.11 0.05 6,895.73 1.17 0.06 6,895.74 1.23 0.07 6,895.75 1.28 0.09 6,895.76 1.34 0.10 6,895.77 1.40 0.12 6,895.78 1.45 0.14 6,895.79 1.50 0.16 6,895.80 1.56 0.19 6,895.81 1.61 0.21 6,895.82 1.66 0.24 6,895.83 1.71 0.27 6,895.84 1.76 0.30 6,895.85 1.81 0.34 6,895.86 1.85 0.38 6,895.87 1.90 0.42 6,895.88 1.95 0.46 6,895.89 1.99 0.50 6,895.90 2.04 0.55 6,895.91 2.08 0.60 6,895.92 2.13 0.65 6,895.93 2.17 0.71 6,895.94 2.22 0.77 6,895.95 2.26 0.83 6,895.96 2.30 0.90 6,895.97 2.34 0.96 6,895.98 2.39 1.03 6,895.99 2.43 1.11 6,896.00 2.47 1.19 6,896.01 2.51 1.27 6,896.02 2.55 1.35 6,896.03 2.59 1.44 6,896.04 2.63 1.53 6,896.05 2.67 1.62 6,896.06 2.71 1.72 6,896.07 2.75 1.82 6,896.08 2.79 1.93 6,896.09 2.83 2.04 6,896.10 2.87 2.15 6,896.11 2.90 2.27 6,896.12 2.94 2.39 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,896.13 2.98 2.51 6,896.14 3.02 2.64 6,896.15 3.05 2.77 6,896.16 3.09 2.91 6,896.17 3.13 3.05 6,896.18 3.16 3.19 6,896.19 3.20 3.34 6,896.20 3.24 3.50 6,896.21 3.27 3.65 6,896.22 3.31 3.81 6,896.23 3.34 3.98 6,896.24 3.38 4.15 6,896.25 3.41 4.33 6,896.26 3.45 4.51 6,896.27 3.48 4.69 6,896.28 3.52 4.88 6,896.29 3.55 5.07 6,896.30 3.59 5.27 6,896.31 3.62 5.48 6,896.32 3.65 5.68 6,896.33 3.69 5.90 6,896.34 3.72 6.11 6,896.35 3.76 6.34 6,896.36 3.79 6.57 6,896.37 3.82 6.80 6,896.38 3.86 7.04 6,896.39 3.89 7.28 6,896.40 3.92 7.53 6,896.41 3.95 7.78 6,896.42 3.99 8.04 6,896.43 4.02 8.30 6,896.44 4.05 8.57 6,896.45 4.08 8.85 6,896.46 4.11 9.13 6,896.47 4.15 9.41 6,896.48 4.18 9.71 6,896.49 4.21 10.00 6,896.50 4.24 10.31 6,896.51 4.27 10.61 6,896.52 4.30 10.93 6,896.53 4.33 11.25 6,896.54 4.37 11.57 6,896.55 4.40 11.90 6,896.56 4.43 12.24 6,896.57 4.46 12.58 6,896.58 4.49 12.93 6,896.59 4.52 13.29 6,896.60 4.55 13.65 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 70HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 19R: Reach-05C Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,895.60 0.0 0 6,895.61 0.0 0 6,895.62 0.0 0 6,895.63 0.0 0 6,895.64 0.0 1 6,895.65 0.0 1 6,895.66 0.0 2 6,895.67 0.0 2 6,895.68 0.0 3 6,895.69 0.0 4 6,895.70 0.0 4 6,895.71 0.0 5 6,895.72 0.0 6 6,895.73 0.1 8 6,895.74 0.1 9 6,895.75 0.1 10 6,895.76 0.1 11 6,895.77 0.1 13 6,895.78 0.1 14 6,895.79 0.1 16 6,895.80 0.1 18 6,895.81 0.1 20 6,895.82 0.1 22 6,895.83 0.2 24 6,895.84 0.2 26 6,895.85 0.2 28 6,895.86 0.2 30 6,895.87 0.2 32 6,895.88 0.2 35 6,895.89 0.3 37 6,895.90 0.3 40 6,895.91 0.3 43 6,895.92 0.3 46 6,895.93 0.3 48 6,895.94 0.3 51 6,895.95 0.4 54 6,895.96 0.4 58 6,895.97 0.4 61 6,895.98 0.4 64 6,895.99 0.5 68 6,896.00 0.5 71 6,896.01 0.5 75 6,896.02 0.5 78 6,896.03 0.6 82 6,896.04 0.6 86 6,896.05 0.6 90 6,896.06 0.6 94 6,896.07 0.7 98 6,896.08 0.7 102 6,896.09 0.7 107 6,896.10 0.8 111 6,896.11 0.8 116 6,896.12 0.8 120 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,896.13 0.8 125 6,896.14 0.9 130 6,896.15 0.9 134 6,896.16 0.9 139 6,896.17 1.0 144 6,896.18 1.0 150 6,896.19 1.0 155 6,896.20 1.1 160 6,896.21 1.1 165 6,896.22 1.2 171 6,896.23 1.2 176 6,896.24 1.2 182 6,896.25 1.3 188 6,896.26 1.3 194 6,896.27 1.3 200 6,896.28 1.4 206 6,896.29 1.4 212 6,896.30 1.5 218 6,896.31 1.5 224 6,896.32 1.6 230 6,896.33 1.6 237 6,896.34 1.6 243 6,896.35 1.7 250 6,896.36 1.7 257 6,896.37 1.8 264 6,896.38 1.8 270 6,896.39 1.9 277 6,896.40 1.9 285 6,896.41 2.0 292 6,896.42 2.0 299 6,896.43 2.1 306 6,896.44 2.1 314 6,896.45 2.2 321 6,896.46 2.2 329 6,896.47 2.3 337 6,896.48 2.3 344 6,896.49 2.4 352 6,896.50 2.4 360 6,896.51 2.5 368 6,896.52 2.5 376 6,896.53 2.6 385 6,896.54 2.7 393 6,896.55 2.7 401 6,896.56 2.8 410 6,896.57 2.8 418 6,896.58 2.9 427 6,896.59 2.9 436 6,896.60 3.0 445 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 71HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 20R: Reach-05D [61] Hint: Exceeded Reach 19R outlet invert by 0.18' @ 19.58 hrs Inflow Area = 105.736 ac, 0.14% Impervious, Inflow Depth > 0.02" for 25-YR event Inflow = 0.20 cfs @ 19.58 hrs, Volume= 0.173 af Outflow = 0.20 cfs @ 19.59 hrs, Volume= 0.173 af, Atten= 0%, Lag= 0.4 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 3.05 fps, Min. Travel Time= 0.5 min Avg. Velocity = 2.49 fps, Avg. Travel Time= 0.6 min Peak Storage= 6 cf @ 19.59 hrs Average Depth at Peak Storage= 0.18' , Surface Width= 0.72' Bank-Full Depth= 5.00' Flow Area= 50.0 sf, Capacity= 1,368.86 cfs 0.00' x 5.00' deep channel, n= 0.035 Earth, dense weeds Side Slope Z-value= 2.0 '/' Top Width= 20.00' Length= 89.1' Slope= 0.1422 '/' Inlet Invert= 6,891.00', Outlet Invert= 6,878.33' Reach 20R: Reach-05D Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=105.736 ac Avg. Flow Depth=0.18' Max Vel=3.05 fps n=0.035 L=89.1' S=0.1422 '/' Capacity=1,368.86 cfs 0.20 cfs0.20 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 72HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 20R: Reach-05D Primary Stage-Discharge Discharge (cfs) 1,2001,0008006004002000Depth (feet)5 4 3 2 1 0 Reach 20R: Reach-05D Storage Stage-Storage Storage (cubic-feet) 4,0003,5003,0002,5002,0001,5001,0005000Depth (feet)5 4 3 2 1 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 73HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 20R: Reach-05D Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,891.00 0.00 5.60 0.00 0 6,891.00 0.00 6.20 0.00 0 6,891.00 0.00 6.80 0.00 0 6,891.00 0.00 7.40 0.00 0 6,891.00 0.00 8.00 0.00 0 6,891.00 0.00 8.60 0.00 0 6,891.00 0.00 9.20 0.00 0 6,891.00 0.00 9.80 0.00 0 6,891.00 0.00 10.40 0.00 0 6,891.00 0.00 11.00 0.00 0 6,891.00 0.00 11.60 0.00 0 6,891.00 0.00 12.20 0.05 2 6,891.10 0.04 12.80 0.13 4 6,891.16 0.13 13.40 0.09 3 6,891.13 0.09 14.00 0.04 2 6,891.10 0.04 14.60 0.04 2 6,891.10 0.04 15.20 0.07 3 6,891.12 0.07 15.80 0.11 4 6,891.15 0.11 16.40 0.14 5 6,891.16 0.14 17.00 0.17 5 6,891.17 0.17 17.60 0.18 5 6,891.17 0.18 18.20 0.19 6 6,891.18 0.19 18.80 0.20 6 6,891.18 0.20 19.40 0.20 6 6,891.18 0.20 20.00 0.20 6 6,891.18 0.20 20.60 0.19 6 6,891.18 0.19 21.20 0.19 6 6,891.18 0.19 21.80 0.19 6 6,891.17 0.19 22.40 0.19 6 6,891.17 0.19 23.00 0.19 6 6,891.18 0.19 23.60 0.19 6 6,891.18 0.19 24.20 0.19 6 6,891.18 0.19 24.80 0.17 5 6,891.17 0.17 25.40 0.10 4 6,891.14 0.11 26.00 0.05 2 6,891.10 0.05 26.60 0.02 1 6,891.07 0.02 27.20 0.01 1 6,891.05 0.01 27.80 0.00 0 6,891.03 0.00 28.40 0.00 0 6,891.01 0.00 29.00 0.00 0 6,891.01 0.00 29.60 0.00 0 6,891.00 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 74HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 20R: Reach-05D Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,891.00 0.00 0.00 6,891.05 1.27 0.01 6,891.10 2.02 0.04 6,891.15 2.64 0.12 6,891.20 3.20 0.26 6,891.25 3.72 0.46 6,891.30 4.20 0.76 6,891.35 4.65 1.14 6,891.40 5.08 1.63 6,891.45 5.50 2.23 6,891.50 5.90 2.95 6,891.55 6.29 3.80 6,891.60 6.66 4.80 6,891.65 7.03 5.94 6,891.70 7.38 7.23 6,891.75 7.73 8.70 6,891.80 8.07 10.33 6,891.85 8.40 12.14 6,891.90 8.73 14.14 6,891.95 9.05 16.33 6,892.00 9.36 18.73 6,892.05 9.67 21.33 6,892.10 9.98 24.14 6,892.15 10.28 27.18 6,892.20 10.57 30.45 6,892.25 10.86 33.95 6,892.30 11.15 37.70 6,892.35 11.44 41.69 6,892.40 11.72 45.93 6,892.45 11.99 50.44 6,892.50 12.27 55.21 6,892.55 12.54 60.25 6,892.60 12.81 65.58 6,892.65 13.07 71.19 6,892.70 13.34 77.09 6,892.75 13.60 83.28 6,892.80 13.85 89.78 6,892.85 14.11 96.58 6,892.90 14.36 103.70 6,892.95 14.61 111.14 6,893.00 14.86 118.90 6,893.05 15.11 126.99 6,893.10 15.35 135.42 6,893.15 15.60 144.19 6,893.20 15.84 153.31 6,893.25 16.08 162.78 6,893.30 16.31 172.60 6,893.35 16.55 182.79 6,893.40 16.78 193.35 6,893.45 17.02 204.28 6,893.50 17.25 215.58 6,893.55 17.48 227.27 6,893.60 17.70 239.35 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,893.65 17.93 251.82 6,893.70 18.15 264.69 6,893.75 18.38 277.97 6,893.80 18.60 291.65 6,893.85 18.82 305.75 6,893.90 19.04 320.26 6,893.95 19.26 335.20 6,894.00 19.48 350.56 6,894.05 19.69 366.36 6,894.10 19.91 382.59 6,894.15 20.12 399.27 6,894.20 20.33 416.40 6,894.25 20.54 433.97 6,894.30 20.75 452.01 6,894.35 20.96 470.50 6,894.40 21.17 489.46 6,894.45 21.38 508.89 6,894.50 21.58 528.80 6,894.55 21.79 549.18 6,894.60 21.99 570.05 6,894.65 22.20 591.41 6,894.70 22.40 613.26 6,894.75 22.60 635.61 6,894.80 22.80 658.46 6,894.85 23.00 681.82 6,894.90 23.20 705.69 6,894.95 23.40 730.07 6,895.00 23.59 754.98 6,895.05 23.79 780.41 6,895.10 23.98 806.36 6,895.15 24.18 832.85 6,895.20 24.37 859.88 6,895.25 24.57 887.45 6,895.30 24.76 915.57 6,895.35 24.95 944.23 6,895.40 25.14 973.45 6,895.45 25.33 1,003.23 6,895.50 25.52 1,033.57 6,895.55 25.71 1,064.48 6,895.60 25.90 1,095.96 6,895.65 26.08 1,128.01 6,895.70 26.27 1,160.65 6,895.75 26.46 1,193.87 6,895.80 26.64 1,227.68 6,895.85 26.83 1,262.07 6,895.90 27.01 1,297.07 6,895.95 27.19 1,332.66 6,896.00 27.38 1,368.86 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 75HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 20R: Reach-05D Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,891.00 0.0 0 6,891.05 0.0 0 6,891.10 0.0 2 6,891.15 0.0 4 6,891.20 0.1 7 6,891.25 0.1 11 6,891.30 0.2 16 6,891.35 0.2 22 6,891.40 0.3 29 6,891.45 0.4 36 6,891.50 0.5 45 6,891.55 0.6 54 6,891.60 0.7 64 6,891.65 0.8 75 6,891.70 1.0 87 6,891.75 1.1 100 6,891.80 1.3 114 6,891.85 1.4 129 6,891.90 1.6 144 6,891.95 1.8 161 6,892.00 2.0 178 6,892.05 2.2 196 6,892.10 2.4 216 6,892.15 2.6 236 6,892.20 2.9 257 6,892.25 3.1 278 6,892.30 3.4 301 6,892.35 3.6 325 6,892.40 3.9 349 6,892.45 4.2 375 6,892.50 4.5 401 6,892.55 4.8 428 6,892.60 5.1 456 6,892.65 5.4 485 6,892.70 5.8 515 6,892.75 6.1 546 6,892.80 6.5 577 6,892.85 6.8 610 6,892.90 7.2 643 6,892.95 7.6 678 6,893.00 8.0 713 6,893.05 8.4 749 6,893.10 8.8 786 6,893.15 9.2 824 6,893.20 9.7 862 6,893.25 10.1 902 6,893.30 10.6 943 6,893.35 11.0 984 6,893.40 11.5 1,026 6,893.45 12.0 1,070 6,893.50 12.5 1,114 6,893.55 13.0 1,159 6,893.60 13.5 1,205 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,893.65 14.0 1,251 6,893.70 14.6 1,299 6,893.75 15.1 1,348 6,893.80 15.7 1,397 6,893.85 16.2 1,447 6,893.90 16.8 1,499 6,893.95 17.4 1,551 6,894.00 18.0 1,604 6,894.05 18.6 1,658 6,894.10 19.2 1,713 6,894.15 19.8 1,768 6,894.20 20.5 1,825 6,894.25 21.1 1,882 6,894.30 21.8 1,941 6,894.35 22.4 2,000 6,894.40 23.1 2,060 6,894.45 23.8 2,121 6,894.50 24.5 2,183 6,894.55 25.2 2,246 6,894.60 25.9 2,309 6,894.65 26.6 2,374 6,894.70 27.4 2,440 6,894.75 28.1 2,506 6,894.80 28.9 2,573 6,894.85 29.6 2,641 6,894.90 30.4 2,710 6,894.95 31.2 2,780 6,895.00 32.0 2,851 6,895.05 32.8 2,923 6,895.10 33.6 2,996 6,895.15 34.4 3,069 6,895.20 35.3 3,143 6,895.25 36.1 3,219 6,895.30 37.0 3,295 6,895.35 37.8 3,372 6,895.40 38.7 3,450 6,895.45 39.6 3,529 6,895.50 40.5 3,609 6,895.55 41.4 3,689 6,895.60 42.3 3,771 6,895.65 43.2 3,853 6,895.70 44.2 3,936 6,895.75 45.1 4,021 6,895.80 46.1 4,106 6,895.85 47.0 4,192 6,895.90 48.0 4,279 6,895.95 49.0 4,366 6,896.00 50.0 4,455 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 76HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 21R: Reach-05E [87] Warning: Oscillations may require smaller dt or Finer Routing (severity=1) [62] Hint: Exceeded Reach 14R OUTLET depth by 0.24' @ 12.32 hrs [62] Hint: Exceeded Reach 20R OUTLET depth by 0.13' @ 12.23 hrs Inflow Area = 114.071 ac, 0.29% Impervious, Inflow Depth > 0.03" for 25-YR event Inflow = 0.46 cfs @ 12.36 hrs, Volume= 0.283 af Outflow = 0.46 cfs @ 12.37 hrs, Volume= 0.283 af, Atten= 0%, Lag= 0.9 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 3.54 fps, Min. Travel Time= 1.1 min Avg. Velocity = 2.59 fps, Avg. Travel Time= 1.4 min Peak Storage= 29 cf @ 12.37 hrs Average Depth at Peak Storage= 0.25' , Surface Width= 1.02' Bank-Full Depth= 3.00' Flow Area= 18.0 sf, Capacity= 328.40 cfs 0.00' x 3.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 2.0 '/' Top Width= 12.00' Length= 224.8' Slope= 0.0917 '/' Inlet Invert= 6,878.33', Outlet Invert= 6,857.72' Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 77HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 21R: Reach-05E Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=114.071 ac Avg. Flow Depth=0.25' Max Vel=3.54 fps n=0.030 L=224.8' S=0.0917 '/' Capacity=328.40 cfs 0.46 cfs0.46 cfs Reach 21R: Reach-05E Primary Stage-Discharge Discharge (cfs) 300250200150100500Depth (feet)3 2 1 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 78HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 21R: Reach-05E Storage Stage-Storage Storage (cubic-feet) 4,0003,5003,0002,5002,0001,5001,0005000Depth (feet)3 2 1 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 79HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 21R: Reach-05E Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,878.33 0.00 5.60 0.00 0 6,878.33 0.00 6.20 0.00 0 6,878.33 0.00 6.80 0.00 0 6,878.33 0.00 7.40 0.00 0 6,878.33 0.00 8.00 0.00 0 6,878.33 0.00 8.60 0.00 0 6,878.33 0.00 9.20 0.00 0 6,878.33 0.00 9.80 0.00 0 6,878.33 0.00 10.40 0.00 0 6,878.33 0.00 11.00 0.00 0 6,878.33 0.00 11.60 0.00 0 6,878.33 0.00 12.20 0.37 24 6,878.56 0.35 12.80 0.39 26 6,878.57 0.39 13.40 0.28 20 6,878.54 0.29 14.00 0.21 16 6,878.52 0.21 14.60 0.18 14 6,878.51 0.18 15.20 0.19 15 6,878.51 0.19 15.80 0.22 17 6,878.52 0.22 16.40 0.24 18 6,878.53 0.24 17.00 0.26 19 6,878.53 0.26 17.60 0.26 19 6,878.54 0.26 18.20 0.27 20 6,878.54 0.27 18.80 0.27 20 6,878.54 0.27 19.40 0.27 20 6,878.54 0.27 20.00 0.26 19 6,878.54 0.26 20.60 0.25 19 6,878.53 0.25 21.20 0.25 18 6,878.53 0.25 21.80 0.24 18 6,878.53 0.24 22.40 0.24 18 6,878.53 0.24 23.00 0.24 18 6,878.53 0.24 23.60 0.25 18 6,878.53 0.25 24.20 0.24 18 6,878.53 0.24 24.80 0.19 15 6,878.51 0.19 25.40 0.11 10 6,878.48 0.11 26.00 0.05 6 6,878.44 0.05 26.60 0.02 3 6,878.41 0.02 27.20 0.01 2 6,878.39 0.01 27.80 0.00 1 6,878.37 0.00 28.40 0.00 0 6,878.36 0.00 29.00 0.00 0 6,878.34 0.00 29.60 0.00 0 6,878.33 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 80HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 21R: Reach-05E Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,878.33 0.00 0.00 6,878.35 0.56 0.00 6,878.37 1.01 0.00 6,878.39 1.34 0.01 6,878.41 1.62 0.02 6,878.43 1.89 0.04 6,878.45 2.13 0.06 6,878.47 2.36 0.09 6,878.49 2.58 0.13 6,878.51 2.80 0.18 6,878.53 3.00 0.24 6,878.55 3.19 0.31 6,878.57 3.39 0.39 6,878.59 3.57 0.49 6,878.61 3.75 0.59 6,878.63 3.93 0.71 6,878.65 4.10 0.84 6,878.67 4.27 0.99 6,878.69 4.44 1.15 6,878.71 4.60 1.33 6,878.73 4.76 1.53 6,878.75 4.92 1.74 6,878.77 5.07 1.97 6,878.79 5.23 2.22 6,878.81 5.38 2.48 6,878.83 5.52 2.77 6,878.85 5.67 3.07 6,878.87 5.82 3.39 6,878.89 5.96 3.74 6,878.91 6.10 4.11 6,878.93 6.24 4.49 6,878.95 6.38 4.91 6,878.97 6.51 5.34 6,878.99 6.65 5.79 6,879.01 6.78 6.28 6,879.03 6.91 6.78 6,879.05 7.05 7.31 6,879.07 7.18 7.87 6,879.09 7.30 8.44 6,879.11 7.43 9.04 6,879.13 7.56 9.68 6,879.15 7.68 10.34 6,879.17 7.81 11.02 6,879.19 7.93 11.74 6,879.21 8.05 12.48 6,879.23 8.18 13.25 6,879.25 8.30 14.05 6,879.27 8.42 14.88 6,879.29 8.54 15.73 6,879.31 8.65 16.63 6,879.33 8.77 17.55 6,879.35 8.89 18.49 6,879.37 9.00 19.48 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,879.39 9.12 20.50 6,879.41 9.23 21.54 6,879.43 9.35 22.63 6,879.45 9.46 23.74 6,879.47 9.57 24.88 6,879.49 9.68 26.07 6,879.51 9.79 27.28 6,879.53 9.90 28.53 6,879.55 10.01 29.82 6,879.57 10.12 31.14 6,879.59 10.23 32.49 6,879.61 10.34 33.89 6,879.63 10.45 35.32 6,879.65 10.55 36.78 6,879.67 10.66 38.29 6,879.69 10.77 39.84 6,879.71 10.87 41.41 6,879.73 10.98 43.04 6,879.75 11.08 44.70 6,879.77 11.18 46.39 6,879.79 11.29 48.13 6,879.81 11.39 49.91 6,879.83 11.49 51.72 6,879.85 11.60 53.59 6,879.87 11.70 55.49 6,879.89 11.80 57.42 6,879.91 11.90 59.42 6,879.93 12.00 61.44 6,879.95 12.10 63.50 6,879.97 12.20 65.62 6,879.99 12.30 67.78 6,880.01 12.40 69.97 6,880.03 12.49 72.22 6,880.05 12.59 74.51 6,880.07 12.69 76.83 6,880.09 12.79 79.22 6,880.11 12.88 81.64 6,880.13 12.98 84.10 6,880.15 13.07 86.63 6,880.17 13.17 89.19 6,880.19 13.27 91.79 6,880.21 13.36 94.45 6,880.23 13.45 97.16 6,880.25 13.55 99.90 6,880.27 13.64 102.71 6,880.29 13.74 105.55 6,880.31 13.83 108.44 6,880.33 13.92 111.40 6,880.35 14.02 114.39 6,880.37 14.11 117.42 6,880.39 14.20 120.53 6,880.41 14.29 123.68 6,880.43 14.38 126.86 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,880.45 14.47 130.12 6,880.47 14.57 133.42 6,880.49 14.66 136.76 6,880.51 14.75 140.17 6,880.53 14.84 143.63 6,880.55 14.93 147.12 6,880.57 15.02 150.70 6,880.59 15.10 154.31 6,880.61 15.19 157.97 6,880.63 15.28 161.70 6,880.65 15.37 165.48 6,880.67 15.46 169.30 6,880.69 15.55 173.20 6,880.71 15.64 177.14 6,880.73 15.72 181.12 6,880.75 15.81 185.19 6,880.77 15.90 189.30 6,880.79 15.98 193.45 6,880.81 16.07 197.69 6,880.83 16.16 201.97 6,880.85 16.24 206.29 6,880.87 16.33 210.70 6,880.89 16.41 215.15 6,880.91 16.50 219.65 6,880.93 16.58 224.23 6,880.95 16.67 228.86 6,880.97 16.75 233.54 6,880.99 16.84 238.30 6,881.01 16.92 243.11 6,881.03 17.01 247.96 6,881.05 17.09 252.90 6,881.07 17.17 257.89 6,881.09 17.26 262.93 6,881.11 17.34 268.05 6,881.13 17.42 273.23 6,881.15 17.51 278.45 6,881.17 17.59 283.76 6,881.19 17.67 289.12 6,881.21 17.75 294.53 6,881.23 17.84 300.03 6,881.25 17.92 305.58 6,881.27 18.00 311.17 6,881.29 18.08 316.87 6,881.31 18.16 322.61 6,881.33 18.24 328.40 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 81HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 21R: Reach-05E Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,878.33 0.0 0 6,878.38 0.0 1 6,878.43 0.0 5 6,878.48 0.0 10 6,878.53 0.1 18 6,878.58 0.1 28 6,878.63 0.2 40 6,878.68 0.2 55 6,878.73 0.3 72 6,878.78 0.4 91 6,878.83 0.5 112 6,878.88 0.6 136 6,878.93 0.7 162 6,878.98 0.8 190 6,879.03 1.0 220 6,879.08 1.1 253 6,879.13 1.3 288 6,879.18 1.4 325 6,879.23 1.6 364 6,879.28 1.8 406 6,879.33 2.0 450 6,879.38 2.2 496 6,879.43 2.4 544 6,879.48 2.6 595 6,879.53 2.9 647 6,879.58 3.1 703 6,879.63 3.4 760 6,879.68 3.6 819 6,879.73 3.9 881 6,879.78 4.2 945 6,879.83 4.5 1,012 6,879.88 4.8 1,080 6,879.93 5.1 1,151 6,879.98 5.4 1,224 6,880.03 5.8 1,299 6,880.08 6.1 1,377 6,880.13 6.5 1,457 6,880.18 6.8 1,539 6,880.23 7.2 1,623 6,880.28 7.6 1,710 6,880.33 8.0 1,798 6,880.38 8.4 1,890 6,880.43 8.8 1,983 6,880.48 9.2 2,078 6,880.53 9.7 2,176 6,880.58 10.1 2,276 6,880.63 10.6 2,378 6,880.68 11.0 2,483 6,880.73 11.5 2,590 6,880.78 12.0 2,699 6,880.83 12.5 2,810 6,880.88 13.0 2,924 6,880.93 13.5 3,039 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,880.98 14.0 3,157 6,881.03 14.6 3,278 6,881.08 15.1 3,400 6,881.13 15.7 3,525 6,881.18 16.2 3,652 6,881.23 16.8 3,781 6,881.28 17.4 3,913 6,881.33 18.0 4,046 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 82HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 22R: Reach-05F [62] Hint: Exceeded Reach 21R OUTLET depth by 0.01' @ 29.57 hrs Inflow Area = 114.071 ac, 0.29% Impervious, Inflow Depth > 0.03" for 25-YR event Inflow = 0.46 cfs @ 12.37 hrs, Volume= 0.283 af Outflow = 0.46 cfs @ 12.38 hrs, Volume= 0.283 af, Atten= 0%, Lag= 0.3 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 2.73 fps, Min. Travel Time= 0.4 min Avg. Velocity = 1.97 fps, Avg. Travel Time= 0.5 min Peak Storage= 10 cf @ 12.38 hrs Average Depth at Peak Storage= 0.24' , Surface Width= 1.42' Bank-Full Depth= 0.70' Flow Area= 1.5 sf, Capacity= 8.25 cfs 0.00' x 0.70' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 3.0 '/' Top Width= 4.20' Length= 61.2' Slope= 0.0559 '/' Inlet Invert= 6,857.72', Outlet Invert= 6,854.30' Reach 22R: Reach-05F Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=114.071 ac Avg. Flow Depth=0.24' Max Vel=2.73 fps n=0.030 L=61.2' S=0.0559 '/' Capacity=8.25 cfs 0.46 cfs0.46 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 83HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 22R: Reach-05F Primary Stage-Discharge Discharge (cfs) 876543210Depth (feet)0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Reach 22R: Reach-05F Storage Stage-Storage Storage (cubic-feet) 80706050403020100Depth (feet)0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 84HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 22R: Reach-05F Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,857.72 0.00 5.60 0.00 0 6,857.72 0.00 6.20 0.00 0 6,857.72 0.00 6.80 0.00 0 6,857.72 0.00 7.40 0.00 0 6,857.72 0.00 8.00 0.00 0 6,857.72 0.00 8.60 0.00 0 6,857.72 0.00 9.20 0.00 0 6,857.72 0.00 9.80 0.00 0 6,857.72 0.00 10.40 0.00 0 6,857.72 0.00 11.00 0.00 0 6,857.72 0.00 11.60 0.00 0 6,857.72 0.00 12.20 0.35 8 6,857.93 0.34 12.80 0.39 9 6,857.94 0.39 13.40 0.29 7 6,857.92 0.29 14.00 0.21 6 6,857.90 0.21 14.60 0.18 5 6,857.89 0.18 15.20 0.19 5 6,857.89 0.19 15.80 0.22 6 6,857.90 0.22 16.40 0.24 6 6,857.91 0.24 17.00 0.26 7 6,857.91 0.26 17.60 0.26 7 6,857.91 0.26 18.20 0.27 7 6,857.91 0.27 18.80 0.27 7 6,857.91 0.27 19.40 0.27 7 6,857.91 0.27 20.00 0.26 7 6,857.91 0.26 20.60 0.25 7 6,857.91 0.25 21.20 0.25 6 6,857.91 0.25 21.80 0.24 6 6,857.91 0.24 22.40 0.24 6 6,857.91 0.24 23.00 0.24 6 6,857.91 0.24 23.60 0.25 6 6,857.91 0.25 24.20 0.24 6 6,857.91 0.25 24.80 0.19 5 6,857.89 0.19 25.40 0.11 4 6,857.86 0.11 26.00 0.05 2 6,857.82 0.05 26.60 0.02 1 6,857.80 0.02 27.20 0.01 1 6,857.78 0.01 27.80 0.00 0 6,857.76 0.00 28.40 0.00 0 6,857.75 0.00 29.00 0.00 0 6,857.74 0.00 29.60 0.00 0 6,857.73 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 85HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 22R: Reach-05F Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,857.72 0.00 0.00 6,857.73 0.33 0.00 6,857.74 0.52 0.00 6,857.75 0.69 0.00 6,857.76 0.83 0.00 6,857.77 0.97 0.01 6,857.78 1.09 0.01 6,857.79 1.21 0.02 6,857.80 1.32 0.03 6,857.81 1.43 0.03 6,857.82 1.53 0.05 6,857.83 1.63 0.06 6,857.84 1.73 0.07 6,857.85 1.83 0.09 6,857.86 1.92 0.11 6,857.87 2.01 0.14 6,857.88 2.10 0.16 6,857.89 2.19 0.19 6,857.90 2.27 0.22 6,857.91 2.35 0.26 6,857.92 2.44 0.29 6,857.93 2.52 0.33 6,857.94 2.60 0.38 6,857.95 2.67 0.42 6,857.96 2.75 0.48 6,857.97 2.83 0.53 6,857.98 2.90 0.59 6,857.99 2.98 0.65 6,858.00 3.05 0.72 6,858.01 3.12 0.79 6,858.02 3.19 0.86 6,858.03 3.26 0.94 6,858.04 3.33 1.02 6,858.05 3.40 1.11 6,858.06 3.47 1.20 6,858.07 3.54 1.30 6,858.08 3.60 1.40 6,858.09 3.67 1.51 6,858.10 3.74 1.62 6,858.11 3.80 1.73 6,858.12 3.87 1.86 6,858.13 3.93 1.98 6,858.14 3.99 2.11 6,858.15 4.06 2.25 6,858.16 4.12 2.39 6,858.17 4.18 2.54 6,858.18 4.24 2.69 6,858.19 4.31 2.85 6,858.20 4.37 3.02 6,858.21 4.43 3.19 6,858.22 4.49 3.37 6,858.23 4.55 3.55 6,858.24 4.61 3.74 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,858.25 4.66 3.93 6,858.26 4.72 4.13 6,858.27 4.78 4.34 6,858.28 4.84 4.55 6,858.29 4.90 4.77 6,858.30 4.95 5.00 6,858.31 5.01 5.23 6,858.32 5.07 5.47 6,858.33 5.12 5.72 6,858.34 5.18 5.97 6,858.35 5.23 6.23 6,858.36 5.29 6.50 6,858.37 5.34 6.77 6,858.38 5.40 7.06 6,858.39 5.45 7.34 6,858.40 5.51 7.64 6,858.41 5.56 7.94 6,858.42 5.61 8.25 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 86HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 22R: Reach-05F Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,857.72 0.0 0 6,857.73 0.0 0 6,857.74 0.0 0 6,857.75 0.0 0 6,857.76 0.0 0 6,857.77 0.0 0 6,857.78 0.0 1 6,857.79 0.0 1 6,857.80 0.0 1 6,857.81 0.0 1 6,857.82 0.0 2 6,857.83 0.0 2 6,857.84 0.0 3 6,857.85 0.1 3 6,857.86 0.1 4 6,857.87 0.1 4 6,857.88 0.1 5 6,857.89 0.1 5 6,857.90 0.1 6 6,857.91 0.1 7 6,857.92 0.1 7 6,857.93 0.1 8 6,857.94 0.1 9 6,857.95 0.2 10 6,857.96 0.2 11 6,857.97 0.2 11 6,857.98 0.2 12 6,857.99 0.2 13 6,858.00 0.2 14 6,858.01 0.3 15 6,858.02 0.3 17 6,858.03 0.3 18 6,858.04 0.3 19 6,858.05 0.3 20 6,858.06 0.3 21 6,858.07 0.4 22 6,858.08 0.4 24 6,858.09 0.4 25 6,858.10 0.4 27 6,858.11 0.5 28 6,858.12 0.5 29 6,858.13 0.5 31 6,858.14 0.5 32 6,858.15 0.6 34 6,858.16 0.6 36 6,858.17 0.6 37 6,858.18 0.6 39 6,858.19 0.7 41 6,858.20 0.7 42 6,858.21 0.7 44 6,858.22 0.8 46 6,858.23 0.8 48 6,858.24 0.8 50 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,858.25 0.8 52 6,858.26 0.9 54 6,858.27 0.9 56 6,858.28 0.9 58 6,858.29 1.0 60 6,858.30 1.0 62 6,858.31 1.0 64 6,858.32 1.1 66 6,858.33 1.1 68 6,858.34 1.2 71 6,858.35 1.2 73 6,858.36 1.2 75 6,858.37 1.3 78 6,858.38 1.3 80 6,858.39 1.3 82 6,858.40 1.4 85 6,858.41 1.4 87 6,858.42 1.5 90 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 87HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 23R: Reach-05G [62] Hint: Exceeded Reach 22R OUTLET depth by 0.13' @ 12.29 hrs Inflow Area = 116.291 ac, 0.35% Impervious, Inflow Depth > 0.03" for 25-YR event Inflow = 0.68 cfs @ 12.32 hrs, Volume= 0.321 af Outflow = 0.68 cfs @ 12.33 hrs, Volume= 0.321 af, Atten= 0%, Lag= 0.4 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 1.80 fps, Min. Travel Time= 0.5 min Avg. Velocity = 1.21 fps, Avg. Travel Time= 0.7 min Peak Storage= 20 cf @ 12.33 hrs Average Depth at Peak Storage= 0.37' , Surface Width= 2.06' Bank-Full Depth= 0.56' Flow Area= 0.9 sf, Capacity= 2.09 cfs 0.00' x 0.56' deep channel, n= 0.040 Earth, cobble bottom, clean sides Side Slope Z-value= 3.1 2.5 '/' Top Width= 3.14' Length= 53.6' Slope= 0.0243 '/' Inlet Invert= 6,854.30', Outlet Invert= 6,853.00' Reach 23R: Reach-05G Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=116.291 ac Avg. Flow Depth=0.37' Max Vel=1.80 fps n=0.040 L=53.6' S=0.0243 '/' Capacity=2.09 cfs 0.68 cfs0.68 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 88HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 23R: Reach-05G Primary Stage-Discharge Discharge (cfs) 210Depth (feet)0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Reach 23R: Reach-05G Storage Stage-Storage Storage (cubic-feet) 454035302520151050Depth (feet)0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 89HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 23R: Reach-05G Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,854.30 0.00 5.60 0.00 0 6,854.30 0.00 6.20 0.00 0 6,854.30 0.00 6.80 0.00 0 6,854.30 0.00 7.40 0.00 0 6,854.30 0.00 8.00 0.00 0 6,854.30 0.00 8.60 0.00 0 6,854.30 0.00 9.20 0.00 0 6,854.30 0.00 9.80 0.00 0 6,854.30 0.00 10.40 0.00 0 6,854.30 0.00 11.00 0.00 0 6,854.30 0.00 11.60 0.00 0 6,854.30 0.00 12.20 0.57 17 6,854.64 0.55 12.80 0.49 16 6,854.62 0.49 13.40 0.35 12 6,854.59 0.35 14.00 0.26 10 6,854.56 0.26 14.60 0.22 9 6,854.54 0.22 15.20 0.23 9 6,854.54 0.23 15.80 0.25 10 6,854.55 0.25 16.40 0.27 10 6,854.56 0.27 17.00 0.28 10 6,854.56 0.28 17.60 0.29 11 6,854.57 0.29 18.20 0.29 11 6,854.57 0.29 18.80 0.30 11 6,854.57 0.30 19.40 0.29 11 6,854.57 0.29 20.00 0.28 11 6,854.56 0.28 20.60 0.27 10 6,854.56 0.27 21.20 0.26 10 6,854.56 0.26 21.80 0.26 10 6,854.56 0.26 22.40 0.26 10 6,854.56 0.26 23.00 0.26 10 6,854.56 0.26 23.60 0.26 10 6,854.56 0.26 24.20 0.26 10 6,854.56 0.26 24.80 0.19 8 6,854.53 0.19 25.40 0.11 5 6,854.49 0.11 26.00 0.05 3 6,854.44 0.05 26.60 0.02 2 6,854.40 0.02 27.20 0.01 1 6,854.37 0.01 27.80 0.00 0 6,854.36 0.00 28.40 0.00 0 6,854.34 0.00 29.00 0.00 0 6,854.33 0.00 29.60 0.00 0 6,854.32 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 90HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 23R: Reach-05G Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,854.30 0.00 0.00 6,854.31 0.16 0.00 6,854.32 0.26 0.00 6,854.33 0.34 0.00 6,854.34 0.41 0.00 6,854.35 0.48 0.00 6,854.36 0.54 0.01 6,854.37 0.59 0.01 6,854.38 0.65 0.01 6,854.39 0.70 0.02 6,854.40 0.75 0.02 6,854.41 0.80 0.03 6,854.42 0.85 0.03 6,854.43 0.90 0.04 6,854.44 0.94 0.05 6,854.45 0.99 0.06 6,854.46 1.03 0.07 6,854.47 1.07 0.09 6,854.48 1.12 0.10 6,854.49 1.16 0.12 6,854.50 1.20 0.13 6,854.51 1.24 0.15 6,854.52 1.28 0.17 6,854.53 1.31 0.19 6,854.54 1.35 0.22 6,854.55 1.39 0.24 6,854.56 1.43 0.27 6,854.57 1.46 0.30 6,854.58 1.50 0.33 6,854.59 1.53 0.36 6,854.60 1.57 0.40 6,854.61 1.60 0.43 6,854.62 1.64 0.47 6,854.63 1.67 0.51 6,854.64 1.71 0.55 6,854.65 1.74 0.60 6,854.66 1.77 0.64 6,854.67 1.80 0.69 6,854.68 1.84 0.74 6,854.69 1.87 0.80 6,854.70 1.90 0.85 6,854.71 1.93 0.91 6,854.72 1.96 0.97 6,854.73 1.99 1.03 6,854.74 2.02 1.10 6,854.75 2.06 1.17 6,854.76 2.09 1.24 6,854.77 2.12 1.31 6,854.78 2.15 1.38 6,854.79 2.18 1.46 6,854.80 2.21 1.54 6,854.81 2.23 1.63 6,854.82 2.26 1.71 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,854.83 2.29 1.80 6,854.84 2.32 1.90 6,854.85 2.35 1.99 6,854.86 2.38 2.09 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 91HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 23R: Reach-05G Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,854.30 0.0 0 6,854.31 0.0 0 6,854.32 0.0 0 6,854.33 0.0 0 6,854.34 0.0 0 6,854.35 0.0 0 6,854.36 0.0 1 6,854.37 0.0 1 6,854.38 0.0 1 6,854.39 0.0 1 6,854.40 0.0 2 6,854.41 0.0 2 6,854.42 0.0 2 6,854.43 0.0 3 6,854.44 0.1 3 6,854.45 0.1 3 6,854.46 0.1 4 6,854.47 0.1 4 6,854.48 0.1 5 6,854.49 0.1 5 6,854.50 0.1 6 6,854.51 0.1 7 6,854.52 0.1 7 6,854.53 0.1 8 6,854.54 0.2 9 6,854.55 0.2 9 6,854.56 0.2 10 6,854.57 0.2 11 6,854.58 0.2 12 6,854.59 0.2 13 6,854.60 0.3 14 6,854.61 0.3 14 6,854.62 0.3 15 6,854.63 0.3 16 6,854.64 0.3 17 6,854.65 0.3 18 6,854.66 0.4 19 6,854.67 0.4 21 6,854.68 0.4 22 6,854.69 0.4 23 6,854.70 0.4 24 6,854.71 0.5 25 6,854.72 0.5 26 6,854.73 0.5 28 6,854.74 0.5 29 6,854.75 0.6 30 6,854.76 0.6 32 6,854.77 0.6 33 6,854.78 0.6 35 6,854.79 0.7 36 6,854.80 0.7 38 6,854.81 0.7 39 6,854.82 0.8 41 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,854.83 0.8 42 6,854.84 0.8 44 6,854.85 0.8 45 6,854.86 0.9 47 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 92HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 28R: Reach-05H [61] Hint: Exceeded Reach 23R outlet invert by 0.30' @ 12.35 hrs Inflow Area = 116.291 ac, 0.35% Impervious, Inflow Depth > 0.03" for 25-YR event Inflow = 0.68 cfs @ 12.33 hrs, Volume= 0.321 af Outflow = 0.68 cfs @ 12.34 hrs, Volume= 0.321 af, Atten= 0%, Lag= 0.5 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 2.15 fps, Min. Travel Time= 0.7 min Avg. Velocity = 1.45 fps, Avg. Travel Time= 1.0 min Peak Storage= 29 cf @ 12.34 hrs Average Depth at Peak Storage= 0.30' , Surface Width= 2.11' Bank-Full Depth= 0.65' Flow Area= 1.5 sf, Capacity= 5.31 cfs 0.00' x 0.65' deep channel, n= 0.040 Earth, cobble bottom, clean sides Side Slope Z-value= 2.0 5.0 '/' Top Width= 4.55' Length= 89.9' Slope= 0.0445 '/' Inlet Invert= 6,853.00', Outlet Invert= 6,849.00' Reach 28R: Reach-05H Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=116.291 ac Avg. Flow Depth=0.30' Max Vel=2.15 fps n=0.040 L=89.9' S=0.0445 '/' Capacity=5.31 cfs 0.68 cfs0.68 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 93HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 28R: Reach-05H Primary Stage-Discharge Discharge (cfs) 543210Depth (feet)0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Reach 28R: Reach-05H Storage Stage-Storage Storage (cubic-feet) 1301201101009080706050403020100Depth (feet)0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 94HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 28R: Reach-05H Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,853.00 0.00 5.60 0.00 0 6,853.00 0.00 6.20 0.00 0 6,853.00 0.00 6.80 0.00 0 6,853.00 0.00 7.40 0.00 0 6,853.00 0.00 8.00 0.00 0 6,853.00 0.00 8.60 0.00 0 6,853.00 0.00 9.20 0.00 0 6,853.00 0.00 9.80 0.00 0 6,853.00 0.00 10.40 0.00 0 6,853.00 0.00 11.00 0.00 0 6,853.00 0.00 11.60 0.00 0 6,853.00 0.00 12.20 0.55 24 6,853.27 0.53 12.80 0.49 22 6,853.27 0.49 13.40 0.35 17 6,853.23 0.35 14.00 0.26 14 6,853.21 0.26 14.60 0.22 12 6,853.20 0.22 15.20 0.23 12 6,853.20 0.23 15.80 0.25 13 6,853.21 0.25 16.40 0.27 14 6,853.21 0.27 17.00 0.28 15 6,853.22 0.28 17.60 0.29 15 6,853.22 0.29 18.20 0.29 15 6,853.22 0.29 18.80 0.30 15 6,853.22 0.30 19.40 0.29 15 6,853.22 0.29 20.00 0.28 15 6,853.22 0.28 20.60 0.27 14 6,853.21 0.27 21.20 0.26 14 6,853.21 0.27 21.80 0.26 14 6,853.21 0.26 22.40 0.26 14 6,853.21 0.26 23.00 0.26 14 6,853.21 0.26 23.60 0.26 14 6,853.21 0.26 24.20 0.26 14 6,853.21 0.26 24.80 0.19 11 6,853.19 0.19 25.40 0.11 8 6,853.15 0.12 26.00 0.05 4 6,853.12 0.05 26.60 0.02 2 6,853.08 0.02 27.20 0.01 1 6,853.06 0.01 27.80 0.00 1 6,853.05 0.00 28.40 0.00 0 6,853.03 0.00 29.00 0.00 0 6,853.02 0.00 29.60 0.00 0 6,853.02 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 95HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 28R: Reach-05H Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,853.00 0.00 0.00 6,853.01 0.22 0.00 6,853.02 0.35 0.00 6,853.03 0.46 0.00 6,853.04 0.56 0.00 6,853.05 0.65 0.01 6,853.06 0.73 0.01 6,853.07 0.81 0.01 6,853.08 0.89 0.02 6,853.09 0.96 0.03 6,853.10 1.03 0.04 6,853.11 1.10 0.05 6,853.12 1.16 0.06 6,853.13 1.23 0.07 6,853.14 1.29 0.09 6,853.15 1.35 0.11 6,853.16 1.41 0.13 6,853.17 1.47 0.15 6,853.18 1.53 0.17 6,853.19 1.58 0.20 6,853.20 1.64 0.23 6,853.21 1.69 0.26 6,853.22 1.74 0.30 6,853.23 1.80 0.33 6,853.24 1.85 0.37 6,853.25 1.90 0.42 6,853.26 1.95 0.46 6,853.27 2.00 0.51 6,853.28 2.05 0.56 6,853.29 2.10 0.62 6,853.30 2.14 0.68 6,853.31 2.19 0.74 6,853.32 2.24 0.80 6,853.33 2.29 0.87 6,853.34 2.33 0.94 6,853.35 2.38 1.02 6,853.36 2.42 1.10 6,853.37 2.47 1.18 6,853.38 2.51 1.27 6,853.39 2.55 1.36 6,853.40 2.60 1.45 6,853.41 2.64 1.55 6,853.42 2.68 1.66 6,853.43 2.73 1.76 6,853.44 2.77 1.88 6,853.45 2.81 1.99 6,853.46 2.85 2.11 6,853.47 2.89 2.24 6,853.48 2.93 2.37 6,853.49 2.97 2.50 6,853.50 3.01 2.64 6,853.51 3.05 2.78 6,853.52 3.09 2.93 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,853.53 3.13 3.08 6,853.54 3.17 3.24 6,853.55 3.21 3.40 6,853.56 3.25 3.57 6,853.57 3.29 3.74 6,853.58 3.33 3.92 6,853.59 3.37 4.10 6,853.60 3.40 4.29 6,853.61 3.44 4.48 6,853.62 3.48 4.68 6,853.63 3.52 4.89 6,853.64 3.55 5.09 6,853.65 3.59 5.31 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 96HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 28R: Reach-05H Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,853.00 0.0 0 6,853.01 0.0 0 6,853.02 0.0 0 6,853.03 0.0 0 6,853.04 0.0 1 6,853.05 0.0 1 6,853.06 0.0 1 6,853.07 0.0 2 6,853.08 0.0 2 6,853.09 0.0 3 6,853.10 0.0 3 6,853.11 0.0 4 6,853.12 0.1 5 6,853.13 0.1 5 6,853.14 0.1 6 6,853.15 0.1 7 6,853.16 0.1 8 6,853.17 0.1 9 6,853.18 0.1 10 6,853.19 0.1 11 6,853.20 0.1 13 6,853.21 0.2 14 6,853.22 0.2 15 6,853.23 0.2 17 6,853.24 0.2 18 6,853.25 0.2 20 6,853.26 0.2 21 6,853.27 0.3 23 6,853.28 0.3 25 6,853.29 0.3 26 6,853.30 0.3 28 6,853.31 0.3 30 6,853.32 0.4 32 6,853.33 0.4 34 6,853.34 0.4 36 6,853.35 0.4 39 6,853.36 0.5 41 6,853.37 0.5 43 6,853.38 0.5 45 6,853.39 0.5 48 6,853.40 0.6 50 6,853.41 0.6 53 6,853.42 0.6 56 6,853.43 0.6 58 6,853.44 0.7 61 6,853.45 0.7 64 6,853.46 0.7 67 6,853.47 0.8 70 6,853.48 0.8 72 6,853.49 0.8 76 6,853.50 0.9 79 6,853.51 0.9 82 6,853.52 0.9 85 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,853.53 1.0 88 6,853.54 1.0 92 6,853.55 1.1 95 6,853.56 1.1 99 6,853.57 1.1 102 6,853.58 1.2 106 6,853.59 1.2 110 6,853.60 1.3 113 6,853.61 1.3 117 6,853.62 1.3 121 6,853.63 1.4 125 6,853.64 1.4 129 6,853.65 1.5 133 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 97HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 31R: Reach-05I [61] Hint: Exceeded Reach 28R outlet invert by 0.28' @ 12.35 hrs Inflow Area = 118.251 ac, 0.39% Impervious, Inflow Depth > 0.04" for 25-YR event Inflow = 0.79 cfs @ 12.34 hrs, Volume= 0.346 af Outflow = 0.79 cfs @ 12.35 hrs, Volume= 0.346 af, Atten= 0%, Lag= 0.4 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 2.79 fps, Min. Travel Time= 0.5 min Avg. Velocity = 1.85 fps, Avg. Travel Time= 0.7 min Peak Storage= 23 cf @ 12.35 hrs Average Depth at Peak Storage= 0.28' , Surface Width= 1.99' Bank-Full Depth= 0.65' Flow Area= 1.5 sf, Capacity= 7.16 cfs 0.00' x 0.65' deep channel, n= 0.040 Earth, cobble bottom, clean sides Side Slope Z-value= 2.0 5.0 '/' Top Width= 4.55' Length= 80.7' Slope= 0.0809 '/' Inlet Invert= 6,849.00', Outlet Invert= 6,842.47' Reach 31R: Reach-05I Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=118.251 ac Avg. Flow Depth=0.28' Max Vel=2.79 fps n=0.040 L=80.7' S=0.0809 '/' Capacity=7.16 cfs 0.79 cfs0.79 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 98HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 31R: Reach-05I Primary Stage-Discharge Discharge (cfs) 76543210Depth (feet)0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Reach 31R: Reach-05I Storage Stage-Storage Storage (cubic-feet) 1101009080706050403020100Depth (feet)0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 99HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 31R: Reach-05I Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,849.00 0.00 5.60 0.00 0 6,849.00 0.00 6.20 0.00 0 6,849.00 0.00 6.80 0.00 0 6,849.00 0.00 7.40 0.00 0 6,849.00 0.00 8.00 0.00 0 6,849.00 0.00 8.60 0.00 0 6,849.00 0.00 9.20 0.00 0 6,849.00 0.00 9.80 0.00 0 6,849.00 0.00 10.40 0.00 0 6,849.00 0.00 11.00 0.00 0 6,849.00 0.00 11.60 0.00 0 6,849.00 0.00 12.20 0.61 18 6,849.25 0.59 12.80 0.56 18 6,849.25 0.56 13.40 0.39 14 6,849.22 0.40 14.00 0.30 11 6,849.20 0.30 14.60 0.24 9 6,849.18 0.24 15.20 0.25 10 6,849.18 0.25 15.80 0.27 10 6,849.19 0.27 16.40 0.29 11 6,849.20 0.29 17.00 0.30 11 6,849.20 0.30 17.60 0.31 11 6,849.20 0.31 18.20 0.31 11 6,849.20 0.31 18.80 0.31 11 6,849.20 0.31 19.40 0.31 11 6,849.20 0.31 20.00 0.30 11 6,849.20 0.30 20.60 0.29 11 6,849.19 0.29 21.20 0.28 10 6,849.19 0.28 21.80 0.27 10 6,849.19 0.27 22.40 0.27 10 6,849.19 0.27 23.00 0.27 10 6,849.19 0.27 23.60 0.28 10 6,849.19 0.28 24.20 0.27 10 6,849.19 0.27 24.80 0.20 8 6,849.17 0.20 25.40 0.12 5 6,849.14 0.12 26.00 0.05 3 6,849.10 0.05 26.60 0.02 2 6,849.08 0.02 27.20 0.01 1 6,849.06 0.01 27.80 0.00 1 6,849.04 0.01 28.40 0.00 0 6,849.03 0.00 29.00 0.00 0 6,849.02 0.00 29.60 0.00 0 6,849.01 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 100HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 31R: Reach-05I Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,849.00 0.00 0.00 6,849.01 0.30 0.00 6,849.02 0.48 0.00 6,849.03 0.62 0.00 6,849.04 0.75 0.00 6,849.05 0.88 0.01 6,849.06 0.99 0.01 6,849.07 1.10 0.02 6,849.08 1.20 0.03 6,849.09 1.30 0.04 6,849.10 1.39 0.05 6,849.11 1.48 0.06 6,849.12 1.57 0.08 6,849.13 1.66 0.10 6,849.14 1.74 0.12 6,849.15 1.82 0.14 6,849.16 1.90 0.17 6,849.17 1.98 0.20 6,849.18 2.06 0.23 6,849.19 2.13 0.27 6,849.20 2.21 0.31 6,849.21 2.28 0.35 6,849.22 2.35 0.40 6,849.23 2.42 0.45 6,849.24 2.49 0.50 6,849.25 2.56 0.56 6,849.26 2.63 0.62 6,849.27 2.70 0.69 6,849.28 2.76 0.76 6,849.29 2.83 0.83 6,849.30 2.89 0.91 6,849.31 2.96 0.99 6,849.32 3.02 1.08 6,849.33 3.08 1.17 6,849.34 3.14 1.27 6,849.35 3.20 1.37 6,849.36 3.27 1.48 6,849.37 3.33 1.59 6,849.38 3.39 1.71 6,849.39 3.44 1.83 6,849.40 3.50 1.96 6,849.41 3.56 2.10 6,849.42 3.62 2.23 6,849.43 3.68 2.38 6,849.44 3.73 2.53 6,849.45 3.79 2.69 6,849.46 3.85 2.85 6,849.47 3.90 3.02 6,849.48 3.96 3.19 6,849.49 4.01 3.37 6,849.50 4.07 3.56 6,849.51 4.12 3.75 6,849.52 4.17 3.95 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,849.53 4.23 4.16 6,849.54 4.28 4.37 6,849.55 4.33 4.59 6,849.56 4.38 4.81 6,849.57 4.44 5.04 6,849.58 4.49 5.28 6,849.59 4.54 5.53 6,849.60 4.59 5.78 6,849.61 4.64 6.04 6,849.62 4.69 6.31 6,849.63 4.74 6.59 6,849.64 4.79 6.87 6,849.65 4.84 7.16 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 101HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 31R: Reach-05I Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,849.00 0.0 0 6,849.01 0.0 0 6,849.02 0.0 0 6,849.03 0.0 0 6,849.04 0.0 0 6,849.05 0.0 1 6,849.06 0.0 1 6,849.07 0.0 1 6,849.08 0.0 2 6,849.09 0.0 2 6,849.10 0.0 3 6,849.11 0.0 3 6,849.12 0.1 4 6,849.13 0.1 5 6,849.14 0.1 6 6,849.15 0.1 6 6,849.16 0.1 7 6,849.17 0.1 8 6,849.18 0.1 9 6,849.19 0.1 10 6,849.20 0.1 11 6,849.21 0.2 12 6,849.22 0.2 14 6,849.23 0.2 15 6,849.24 0.2 16 6,849.25 0.2 18 6,849.26 0.2 19 6,849.27 0.3 21 6,849.28 0.3 22 6,849.29 0.3 24 6,849.30 0.3 25 6,849.31 0.3 27 6,849.32 0.4 29 6,849.33 0.4 31 6,849.34 0.4 33 6,849.35 0.4 35 6,849.36 0.5 37 6,849.37 0.5 39 6,849.38 0.5 41 6,849.39 0.5 43 6,849.40 0.6 45 6,849.41 0.6 47 6,849.42 0.6 50 6,849.43 0.6 52 6,849.44 0.7 55 6,849.45 0.7 57 6,849.46 0.7 60 6,849.47 0.8 62 6,849.48 0.8 65 6,849.49 0.8 68 6,849.50 0.9 71 6,849.51 0.9 73 6,849.52 0.9 76 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,849.53 1.0 79 6,849.54 1.0 82 6,849.55 1.1 85 6,849.56 1.1 89 6,849.57 1.1 92 6,849.58 1.2 95 6,849.59 1.2 98 6,849.60 1.3 102 6,849.61 1.3 105 6,849.62 1.3 109 6,849.63 1.4 112 6,849.64 1.4 116 6,849.65 1.5 119 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 102HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Pond 8P: PRE-AREA-07A-CULVERT [57] Hint: Peaked at 6,994.98' (Flood elevation advised) Inflow Area = 5.631 ac, 0.00% Impervious, Inflow Depth = 0.13" for 25-YR event Inflow = 0.18 cfs @ 12.85 hrs, Volume= 0.063 af Outflow = 0.18 cfs @ 12.85 hrs, Volume= 0.063 af, Atten= 0%, Lag= 0.0 min Primary = 0.12 cfs @ 12.85 hrs, Volume= 0.060 af Secondary = 0.06 cfs @ 12.85 hrs, Volume= 0.004 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Peak Elev= 6,994.98' @ 12.85 hrs Device Routing Invert Outlet Devices #1 Primary 6,993.74'18.0" Round Culvert w/ 16.5" inside fill L= 30.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 6,992.37' / 6,991.77' S= 0.0200 '/' Cc= 0.900 n= 0.025 Corrugated metal, Flow Area= 0.07 sf #2 Secondary 6,994.87'Channel/Reach using Reach 9R: Reach 7A-6 Primary OutFlow Max=0.12 cfs @ 12.85 hrs HW=6,994.98' TW=6,991.79' (Dynamic Tailwater) 1=Culvert (Barrel Controls 0.12 cfs @ 1.65 fps) Secondary OutFlow Max=0.06 cfs @ 12.85 hrs HW=6,994.98' TW=6,994.98' (Dynamic Tailwater) 2=Channel/Reach (Channel Controls 0.06 cfs @ 1.97 fps) Pond 8P: PRE-AREA-07A-CULVERT Inflow Outflow Primary Secondary Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=5.631 ac Peak Elev=6,994.98' 0.18 cfs0.18 cfs 0.12 cfs 0.06 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 103HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Pond 8P: PRE-AREA-07A-CULVERT Total Primary Secondary Stage-Discharge Discharge (cfs) 20181614121086420Elevation (feet)6,995 6,994 Culvert Initial Tailwater Channel/Reach Pond 8P: PRE-AREA-07A-CULVERT Storage Stage-Area-Storage Storage (acre-feet) 0Elevation (feet)6,995 6,994 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 104HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Pond 8P: PRE-AREA-07A-CULVERT Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) Primary (cfs) Secondary (cfs) 5.00 0.00 6,993.74 0.00 0.00 0.00 5.60 0.00 6,993.74 0.00 0.00 0.00 6.20 0.00 6,993.74 0.00 0.00 0.00 6.80 0.00 6,993.74 0.00 0.00 0.00 7.40 0.00 6,993.74 0.00 0.00 0.00 8.00 0.00 6,993.74 0.00 0.00 0.00 8.60 0.00 6,993.74 0.00 0.00 0.00 9.20 0.00 6,993.74 0.00 0.00 0.00 9.80 0.00 6,993.74 0.00 0.00 0.00 10.40 0.00 6,993.74 0.00 0.00 0.00 11.00 0.00 6,993.74 0.00 0.00 0.00 11.60 0.00 6,993.74 0.00 0.00 0.00 12.20 0.03 6,993.80 0.03 0.03 0.00 12.80 0.18 6,994.98 0.18 0.12 0.06 13.40 0.14 6,994.95 0.14 0.11 0.02 14.00 0.10 6,994.66 0.10 0.10 0.00 14.60 0.08 6,994.16 0.08 0.08 0.00 15.20 0.07 6,993.94 0.07 0.07 0.00 15.80 0.07 6,993.87 0.07 0.07 0.00 16.40 0.06 6,993.85 0.06 0.06 0.00 17.00 0.05 6,993.84 0.05 0.05 0.00 17.60 0.05 6,993.84 0.05 0.05 0.00 18.20 0.05 6,993.84 0.05 0.05 0.00 18.80 0.05 6,993.83 0.05 0.05 0.00 19.40 0.04 6,993.83 0.04 0.04 0.00 20.00 0.04 6,993.82 0.04 0.04 0.00 20.60 0.04 6,993.82 0.04 0.04 0.00 21.20 0.04 6,993.82 0.04 0.04 0.00 21.80 0.03 6,993.81 0.03 0.03 0.00 22.40 0.03 6,993.81 0.03 0.03 0.00 23.00 0.03 6,993.81 0.03 0.03 0.00 23.60 0.03 6,993.81 0.03 0.03 0.00 24.20 0.03 6,993.81 0.03 0.03 0.00 24.80 0.02 6,993.78 0.02 0.02 0.00 25.40 0.00 6,993.76 0.00 0.00 0.00 26.00 0.00 6,993.75 0.00 0.00 0.00 26.60 0.00 6,993.75 0.00 0.00 0.00 27.20 0.00 6,993.74 0.00 0.00 0.00 27.80 0.00 6,993.74 0.00 0.00 0.00 28.40 0.00 6,993.74 0.00 0.00 0.00 29.00 0.00 6,993.74 0.00 0.00 0.00 29.60 0.00 6,993.74 0.00 0.00 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 105HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Pond 8P: PRE-AREA-07A-CULVERT Elevation (feet) Discharge (cfs) Primary (cfs) Secondary (cfs) 6,993.74 0.00 0.00 0.00 6,993.80 0.02 0.02 0.00 6,993.85 0.05 0.05 0.00 6,993.89 0.08 0.08 0.00 6,993.94 0.07 0.07 0.00 6,993.99 0.08 0.08 0.00 6,994.05 0.08 0.08 0.00 6,994.10 0.08 0.08 0.00 6,994.14 0.08 0.08 0.00 6,994.19 0.09 0.09 0.00 6,994.24 0.09 0.09 0.00 6,994.30 0.09 0.09 0.00 6,994.35 0.09 0.09 0.00 6,994.39 0.09 0.09 0.00 6,994.44 0.10 0.10 0.00 6,994.49 0.10 0.10 0.00 6,994.55 0.10 0.10 0.00 6,994.60 0.10 0.10 0.00 6,994.64 0.10 0.10 0.00 6,994.69 0.11 0.11 0.00 6,994.74 0.11 0.11 0.00 6,994.80 0.11 0.11 0.00 6,994.85 0.11 0.11 0.00 6,994.89 0.11 0.11 0.00 6,994.94 0.14 0.11 0.02 6,994.99 0.20 0.12 0.08 6,995.05 0.32 0.12 0.20 6,995.10 0.51 0.12 0.39 6,995.14 0.79 0.12 0.67 6,995.19 1.17 0.12 1.05 6,995.24 1.66 0.12 1.54 6,995.30 2.27 0.13 2.14 6,995.35 3.01 0.13 2.88 6,995.39 3.90 0.13 3.77 6,995.44 4.93 0.13 4.80 6,995.49 6.13 0.13 6.00 6,995.55 7.50 0.13 7.36 6,995.60 9.04 0.14 8.91 6,995.64 10.78 0.14 10.64 6,995.69 12.71 0.14 12.57 6,995.74 14.85 0.14 14.71 6,995.80 17.20 0.14 17.06 6,995.85 19.77 0.14 19.63 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 106HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 8P: PRE-AREA-07A-CULVERT Elevation (feet) Storage (acre-feet) 6,993.74 0.000 6,993.77 0.000 6,993.78 0.000 6,993.81 0.000 6,993.82 0.000 6,993.85 0.000 6,993.86 0.000 6,993.89 0.000 6,993.90 0.000 6,993.93 0.000 6,993.94 0.000 6,993.97 0.000 6,993.98 0.000 6,994.01 0.000 6,994.02 0.000 6,994.05 0.000 6,994.06 0.000 6,994.09 0.000 6,994.10 0.000 6,994.13 0.000 6,994.14 0.000 6,994.16 0.000 6,994.18 0.000 6,994.20 0.000 6,994.22 0.000 6,994.24 0.000 6,994.27 0.000 6,994.28 0.000 6,994.31 0.000 6,994.32 0.000 6,994.35 0.000 6,994.36 0.000 6,994.39 0.000 6,994.40 0.000 6,994.43 0.000 6,994.44 0.000 6,994.47 0.000 6,994.48 0.000 6,994.51 0.000 6,994.52 0.000 6,994.55 0.000 6,994.56 0.000 6,994.59 0.000 6,994.60 0.000 6,994.63 0.000 6,994.64 0.000 6,994.66 0.000 6,994.68 0.000 6,994.70 0.000 6,994.72 0.000 6,994.74 0.000 6,994.77 0.000 6,994.78 0.000 Elevation (feet) Storage (acre-feet) 6,994.81 0.000 6,994.82 0.000 6,994.85 0.000 6,994.86 0.000 6,994.89 0.000 6,994.90 0.000 6,994.93 0.000 6,994.94 0.000 6,994.97 0.000 6,994.98 0.000 6,995.01 0.000 6,995.02 0.000 6,995.05 0.000 6,995.06 0.000 6,995.09 0.000 6,995.10 0.000 6,995.13 0.000 6,995.14 0.000 6,995.16 0.000 6,995.18 0.000 6,995.20 0.000 6,995.22 0.000 6,995.24 0.000 6,995.27 0.000 6,995.28 0.000 6,995.31 0.000 6,995.32 0.000 6,995.35 0.000 6,995.36 0.000 6,995.39 0.000 6,995.40 0.000 6,995.43 0.000 6,995.44 0.000 6,995.47 0.000 6,995.48 0.000 6,995.51 0.000 6,995.52 0.000 6,995.55 0.000 6,995.56 0.000 6,995.59 0.000 6,995.60 0.000 6,995.63 0.000 6,995.64 0.000 6,995.66 0.000 6,995.68 0.000 6,995.70 0.000 6,995.72 0.000 6,995.74 0.000 6,995.77 0.000 6,995.78 0.000 6,995.81 0.000 6,995.82 0.000 6,995.85 0.000 Elevation (feet) Storage (acre-feet) 6,995.86 0.000 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 107HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Time span=5.00-30.00 hrs, dt=0.03 hrs, 834 points x 3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=5.631 ac 0.00% Impervious Runoff Depth=0.31"Subcatchment 7S: PRE-AREA-07A Flow Length=813' Tc=55.4 min CN=57 Runoff=0.60 cfs 0.143 af Runoff Area=76.472 ac 0.00% Impervious Runoff Depth=0.09"Subcatchment 10S: PRE-AREA-06 Flow Length=4,044' Tc=99.4 min CN=46 Runoff=0.79 cfs 0.548 af Runoff Area=27.686 ac 0.00% Impervious Runoff Depth=0.09"Subcatchment 11S: PRE-AREA-05 Flow Length=5,152' Tc=107.9 min CN=46 Runoff=0.28 cfs 0.199 af Runoff Area=0.786 ac 7.51% Impervious Runoff Depth=0.39"Subcatchment 24S: PRE-AREA-04A Flow Length=208' Tc=45.0 min CN=60 Runoff=0.14 cfs 0.025 af Runoff Area=0.792 ac 10.86% Impervious Runoff Depth=0.42"Subcatchment 25S: PRE-AREA-04B Flow Length=328' Tc=33.8 min CN=61 Runoff=0.19 cfs 0.027 af Runoff Area=2.704 ac 6.84% Impervious Runoff Depth=0.45"Subcatchment 26S: PRE-AREA-04C Flow Length=525' Tc=25.7 min CN=62 Runoff=0.88 cfs 0.100 af Runoff Area=2.220 ac 3.38% Impervious Runoff Depth=0.42"Subcatchment 30S: PRE-AREA-04D-1 Flow Length=574' Tc=25.0 min CN=61 Runoff=0.67 cfs 0.077 af Runoff Area=1.960 ac 2.81% Impervious Runoff Depth=0.33"Subcatchment 32S: PRE-AREA-04D-2 Flow Length=707' Tc=29.6 min CN=58 Runoff=0.37 cfs 0.054 af Avg. Flow Depth=0.24' Max Vel=3.26 fps Inflow=0.48 cfs 0.049 afReach 9R: Reach 7A-6 n=0.030 L=626.8' S=0.0800 '/' Capacity=21.00 cfs Outflow=0.48 cfs 0.049 af Avg. Flow Depth=0.23' Max Vel=2.62 fps Inflow=0.89 cfs 0.598 afReach 13R: PRE-AREA-06-CULVERT 18.0" Round Pipe w/ 8.0" inside fill n=0.025 L=30.0' S=0.0200 '/' Capacity=3.37 cfs Outflow=0.89 cfs 0.598 af Avg. Flow Depth=0.02' Max Vel=1.44 fps Inflow=0.12 cfs 0.094 afReach 14R: Reach-07A n=0.035 L=355.0' S=0.3195 '/' Capacity=26.97 cfs Outflow=0.12 cfs 0.094 af Avg. Flow Depth=0.05' Max Vel=2.46 fps Inflow=0.89 cfs 0.598 afReach 15R: Reach-06 n=0.035 L=188.3' S=0.2577 '/' Capacity=24.22 cfs Outflow=0.89 cfs 0.598 af Avg. Flow Depth=0.09' Max Vel=3.15 fps Inflow=0.28 cfs 0.199 afReach 16R: PRE-AREA-05-CULVERT 12.0" Round Pipe w/ 5.0" inside fill n=0.012 L=30.0' S=0.0200 '/' Capacity=2.60 cfs Outflow=0.28 cfs 0.199 af Avg. Flow Depth=0.03' Max Vel=1.44 fps Inflow=0.28 cfs 0.199 afReach 17R: Reach-05A n=0.035 L=173.7' S=0.1471 '/' Capacity=18.30 cfs Outflow=0.28 cfs 0.199 af Avg. Flow Depth=0.27' Max Vel=1.39 fps Inflow=0.31 cfs 0.224 afReach 18R: Reach-05B n=0.035 L=104.5' S=0.0166 '/' Capacity=9.97 cfs Outflow=0.31 cfs 0.224 af Avg. Flow Depth=0.40' Max Vel=2.49 fps Inflow=1.22 cfs 0.849 afReach 19R: Reach-05C n=0.035 L=148.2' S=0.0310 '/' Capacity=13.65 cfs Outflow=1.22 cfs 0.849 af Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 108HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Avg. Flow Depth=0.36' Max Vel=4.74 fps Inflow=1.22 cfs 0.849 afReach 20R: Reach-05D n=0.035 L=89.1' S=0.1422 '/' Capacity=1,368.86 cfs Outflow=1.22 cfs 0.849 af Avg. Flow Depth=0.39' Max Vel=4.70 fps Inflow=1.44 cfs 1.044 afReach 21R: Reach-05E n=0.030 L=224.8' S=0.0917 '/' Capacity=328.40 cfs Outflow=1.44 cfs 1.044 af Avg. Flow Depth=0.36' Max Vel=3.63 fps Inflow=1.44 cfs 1.044 afReach 22R: Reach-05F n=0.030 L=61.2' S=0.0559 '/' Capacity=8.25 cfs Outflow=1.44 cfs 1.044 af Avg. Flow Depth=0.54' Max Vel=2.31 fps Inflow=1.86 cfs 1.120 afReach 23R: Reach-05G n=0.040 L=53.6' S=0.0243 '/' Capacity=2.09 cfs Outflow=1.86 cfs 1.120 af Avg. Flow Depth=0.44' Max Vel=2.76 fps Inflow=1.86 cfs 1.120 afReach 28R: Reach-05H n=0.040 L=89.9' S=0.0445 '/' Capacity=5.31 cfs Outflow=1.86 cfs 1.120 af Avg. Flow Depth=0.42' Max Vel=3.61 fps Inflow=2.22 cfs 1.175 afReach 31R: Reach-05I n=0.040 L=80.7' S=0.0809 '/' Capacity=7.16 cfs Outflow=2.22 cfs 1.175 af Peak Elev=6,995.11' Inflow=0.60 cfs 0.143 afPond 8P: PRE-AREA-07A-CULVERT Primary=0.12 cfs 0.094 af Secondary=0.48 cfs 0.049 af Outflow=0.60 cfs 0.143 af Total Runoff Area = 118.251 ac Runoff Volume = 1.175 af Average Runoff Depth = 0.12" 99.61% Pervious = 117.791 ac 0.39% Impervious = 0.460 ac Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 109HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: PRE-AREA-07A [47] Hint: Peak is 158% of capacity of segment #3 Runoff = 0.60 cfs @ 12.73 hrs, Volume= 0.143 af, Depth= 0.31" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.15 Area (ac) CN Description 5.631 57 Oak/aspen range, Fair, HSG C 5.631 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 48.9 270 0.2237 0.09 Sheet Flow, Oak Brush Woods: Dense underbrush n= 0.800 P2= 1.33" 6.3 521 0.3082 1.39 Shallow Concentrated Flow, Oak Brush Forest w/Heavy Litter Kv= 2.5 fps 0.2 22 0.0581 2.43 0.38 Trap/Vee/Rect Channel Flow, Roadside Ditch Bot.W=0.00' D=0.25' Z= 2.5 '/' Top.W=1.25' n= 0.035 Earth, dense weeds 55.4 813 Total Subcatchment 7S: PRE-AREA-07A Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 100-YR Rainfall=2.81" Ia/S=0.15 Runoff Area=5.631 ac Runoff Volume=0.143 af Runoff Depth=0.31" Flow Length=813' Tc=55.4 min CN=57 0.60 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 110HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 7S: PRE-AREA-07A Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.18 0.00 0.00 5.30 0.19 0.00 0.00 5.60 0.21 0.00 0.00 5.90 0.22 0.00 0.00 6.20 0.24 0.00 0.00 6.50 0.25 0.00 0.00 6.80 0.27 0.00 0.00 7.10 0.28 0.00 0.00 7.40 0.30 0.00 0.00 7.70 0.32 0.00 0.00 8.00 0.34 0.00 0.00 8.30 0.36 0.00 0.00 8.60 0.38 0.00 0.00 8.90 0.40 0.00 0.00 9.20 0.43 0.00 0.00 9.50 0.46 0.00 0.00 9.80 0.49 0.00 0.00 10.10 0.52 0.00 0.00 10.40 0.56 0.00 0.00 10.70 0.60 0.00 0.00 11.00 0.66 0.00 0.00 11.30 0.73 0.00 0.00 11.60 0.86 0.00 0.00 11.90 1.60 0.03 0.00 12.20 1.96 0.08 0.14 12.50 2.07 0.10 0.51 12.80 2.13 0.12 0.59 13.10 2.19 0.13 0.45 13.40 2.23 0.14 0.35 13.70 2.27 0.15 0.28 14.00 2.30 0.16 0.23 14.30 2.33 0.17 0.20 14.60 2.36 0.17 0.17 14.90 2.39 0.18 0.16 15.20 2.41 0.19 0.15 15.50 2.44 0.19 0.14 15.80 2.46 0.20 0.13 16.10 2.48 0.20 0.12 16.40 2.50 0.21 0.11 16.70 2.52 0.21 0.11 17.00 2.53 0.22 0.10 17.30 2.55 0.22 0.10 17.60 2.57 0.23 0.10 17.90 2.58 0.23 0.09 18.20 2.60 0.24 0.09 18.50 2.61 0.24 0.09 18.80 2.63 0.25 0.09 19.10 2.64 0.25 0.08 19.40 2.65 0.26 0.08 19.70 2.66 0.26 0.08 20.00 2.68 0.26 0.07 20.30 2.69 0.27 0.07 20.60 2.70 0.27 0.07 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.71 0.27 0.07 21.20 2.72 0.28 0.06 21.50 2.73 0.28 0.06 21.80 2.74 0.28 0.06 22.10 2.75 0.29 0.06 22.40 2.76 0.29 0.06 22.70 2.77 0.29 0.06 23.00 2.78 0.30 0.06 23.30 2.79 0.30 0.06 23.60 2.80 0.30 0.06 23.90 2.81 0.30 0.06 24.20 2.81 0.31 0.06 24.50 2.81 0.31 0.05 24.80 2.81 0.31 0.03 25.10 2.81 0.31 0.01 25.40 2.81 0.31 0.01 25.70 2.81 0.31 0.00 26.00 2.81 0.31 0.00 26.30 2.81 0.31 0.00 26.60 2.81 0.31 0.00 26.90 2.81 0.31 0.00 27.20 2.81 0.31 0.00 27.50 2.81 0.31 0.00 27.80 2.81 0.31 0.00 28.10 2.81 0.31 0.00 28.40 2.81 0.31 0.00 28.70 2.81 0.31 0.00 29.00 2.81 0.31 0.00 29.30 2.81 0.31 0.00 29.60 2.81 0.31 0.00 29.90 2.81 0.31 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 111HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 10S: PRE-AREA-06 [47] Hint: Peak is 148% of capacity of segment #3 Runoff = 0.79 cfs @ 14.44 hrs, Volume= 0.548 af, Depth= 0.09" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.15 Area (ac) CN Description 53.530 41 Oak/aspen range, Good, HSG C 22.942 57 Oak/aspen range, Fair, HSG C 76.472 46 Weighted Average 76.472 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 45.3 201 0.1496 0.07 Sheet Flow, Oak - Aspen Woods: Dense underbrush n= 0.800 P2= 1.33" 53.4 3,697 0.2131 1.15 Shallow Concentrated Flow, Oak Brush Forest w/Heavy Litter Kv= 2.5 fps 0.7 146 0.0847 3.43 0.54 Trap/Vee/Rect Channel Flow, Roadside Ditch Bot.W=0.00' D=0.25' Z= 2.5 '/' Top.W=1.25' n= 0.030 Earth, grassed & winding 99.4 4,044 Total Subcatchment 10S: PRE-AREA-06 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 100-YR Rainfall=2.81" Ia/S=0.15 Runoff Area=76.472 ac Runoff Volume=0.548 af Runoff Depth=0.09" Flow Length=4,044' Tc=99.4 min CN=46 0.79 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 112HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 10S: PRE-AREA-06 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.18 0.00 0.00 5.30 0.19 0.00 0.00 5.60 0.21 0.00 0.00 5.90 0.22 0.00 0.00 6.20 0.24 0.00 0.00 6.50 0.25 0.00 0.00 6.80 0.27 0.00 0.00 7.10 0.28 0.00 0.00 7.40 0.30 0.00 0.00 7.70 0.32 0.00 0.00 8.00 0.34 0.00 0.00 8.30 0.36 0.00 0.00 8.60 0.38 0.00 0.00 8.90 0.40 0.00 0.00 9.20 0.43 0.00 0.00 9.50 0.46 0.00 0.00 9.80 0.49 0.00 0.00 10.10 0.52 0.00 0.00 10.40 0.56 0.00 0.00 10.70 0.60 0.00 0.00 11.00 0.66 0.00 0.00 11.30 0.73 0.00 0.00 11.60 0.86 0.00 0.00 11.90 1.60 0.00 0.00 12.20 1.96 0.00 0.00 12.50 2.07 0.01 0.04 12.80 2.13 0.01 0.15 13.10 2.19 0.01 0.35 13.40 2.23 0.02 0.55 13.70 2.27 0.02 0.69 14.00 2.30 0.02 0.77 14.30 2.33 0.03 0.79 14.60 2.36 0.03 0.79 14.90 2.39 0.03 0.77 15.20 2.41 0.03 0.74 15.50 2.44 0.04 0.72 15.80 2.46 0.04 0.70 16.10 2.48 0.04 0.68 16.40 2.50 0.04 0.66 16.70 2.52 0.05 0.63 17.00 2.53 0.05 0.61 17.30 2.55 0.05 0.59 17.60 2.57 0.05 0.57 17.90 2.58 0.05 0.56 18.20 2.60 0.06 0.55 18.50 2.61 0.06 0.54 18.80 2.63 0.06 0.52 19.10 2.64 0.06 0.51 19.40 2.65 0.06 0.50 19.70 2.66 0.06 0.49 20.00 2.68 0.07 0.47 20.30 2.69 0.07 0.46 20.60 2.70 0.07 0.44 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.71 0.07 0.43 21.20 2.72 0.07 0.42 21.50 2.73 0.07 0.41 21.80 2.74 0.08 0.40 22.10 2.75 0.08 0.40 22.40 2.76 0.08 0.39 22.70 2.77 0.08 0.39 23.00 2.78 0.08 0.39 23.30 2.79 0.08 0.39 23.60 2.80 0.08 0.39 23.90 2.81 0.09 0.38 24.20 2.81 0.09 0.38 24.50 2.81 0.09 0.37 24.80 2.81 0.09 0.33 25.10 2.81 0.09 0.27 25.40 2.81 0.09 0.19 25.70 2.81 0.09 0.13 26.00 2.81 0.09 0.08 26.30 2.81 0.09 0.05 26.60 2.81 0.09 0.03 26.90 2.81 0.09 0.02 27.20 2.81 0.09 0.01 27.50 2.81 0.09 0.01 27.80 2.81 0.09 0.01 28.10 2.81 0.09 0.00 28.40 2.81 0.09 0.00 28.70 2.81 0.09 0.00 29.00 2.81 0.09 0.00 29.30 2.81 0.09 0.00 29.60 2.81 0.09 0.00 29.90 2.81 0.09 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 113HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 11S: PRE-AREA-05 Runoff = 0.28 cfs @ 14.52 hrs, Volume= 0.199 af, Depth= 0.09" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.15 Area (ac) CN Description 19.380 41 Oak/aspen range, Good, HSG C 8.306 57 Oak/aspen range, Fair, HSG C 27.686 46 Weighted Average 27.686 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 34.7 200 0.2894 0.10 Sheet Flow, Oak-Aspen Woods: Dense underbrush n= 0.800 P2= 1.33" 69.4 4,586 0.1943 1.10 Shallow Concentrated Flow, Oak-Aspen Forest w/Heavy Litter Kv= 2.5 fps 1.5 131 0.0375 1.45 0.35 Trap/Vee/Rect Channel Flow, Channel along old RR Grade Bot.W=0.00' D=0.15' Z= 2.2 & 19.3 '/' Top.W=3.23' n= 0.035 Earth, dense weeds 1.7 110 0.1888 1.09 Shallow Concentrated Flow, Oak Brush Forest w/Heavy Litter Kv= 2.5 fps 0.6 125 0.0785 3.30 0.52 Trap/Vee/Rect Channel Flow, Roadside Ditch Bot.W=0.00' D=0.25' Z= 2.5 '/' Top.W=1.25' n= 0.030 Earth, grassed & winding 107.9 5,152 Total Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 114HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcatchment 11S: PRE-AREA-05 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr 100-YR Rainfall=2.81" Ia/S=0.15 Runoff Area=27.686 ac Runoff Volume=0.199 af Runoff Depth=0.09" Flow Length=5,152' Tc=107.9 min CN=46 0.28 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 115HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 11S: PRE-AREA-05 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.18 0.00 0.00 5.30 0.19 0.00 0.00 5.60 0.21 0.00 0.00 5.90 0.22 0.00 0.00 6.20 0.24 0.00 0.00 6.50 0.25 0.00 0.00 6.80 0.27 0.00 0.00 7.10 0.28 0.00 0.00 7.40 0.30 0.00 0.00 7.70 0.32 0.00 0.00 8.00 0.34 0.00 0.00 8.30 0.36 0.00 0.00 8.60 0.38 0.00 0.00 8.90 0.40 0.00 0.00 9.20 0.43 0.00 0.00 9.50 0.46 0.00 0.00 9.80 0.49 0.00 0.00 10.10 0.52 0.00 0.00 10.40 0.56 0.00 0.00 10.70 0.60 0.00 0.00 11.00 0.66 0.00 0.00 11.30 0.73 0.00 0.00 11.60 0.86 0.00 0.00 11.90 1.60 0.00 0.00 12.20 1.96 0.00 0.00 12.50 2.07 0.01 0.01 12.80 2.13 0.01 0.04 13.10 2.19 0.01 0.10 13.40 2.23 0.02 0.17 13.70 2.27 0.02 0.23 14.00 2.30 0.02 0.26 14.30 2.33 0.03 0.28 14.60 2.36 0.03 0.28 14.90 2.39 0.03 0.28 15.20 2.41 0.03 0.27 15.50 2.44 0.04 0.26 15.80 2.46 0.04 0.26 16.10 2.48 0.04 0.25 16.40 2.50 0.04 0.24 16.70 2.52 0.05 0.23 17.00 2.53 0.05 0.22 17.30 2.55 0.05 0.22 17.60 2.57 0.05 0.21 17.90 2.58 0.05 0.20 18.20 2.60 0.06 0.20 18.50 2.61 0.06 0.20 18.80 2.63 0.06 0.19 19.10 2.64 0.06 0.19 19.40 2.65 0.06 0.18 19.70 2.66 0.06 0.18 20.00 2.68 0.07 0.17 20.30 2.69 0.07 0.17 20.60 2.70 0.07 0.16 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.71 0.07 0.16 21.20 2.72 0.07 0.15 21.50 2.73 0.07 0.15 21.80 2.74 0.08 0.15 22.10 2.75 0.08 0.14 22.40 2.76 0.08 0.14 22.70 2.77 0.08 0.14 23.00 2.78 0.08 0.14 23.30 2.79 0.08 0.14 23.60 2.80 0.08 0.14 23.90 2.81 0.09 0.14 24.20 2.81 0.09 0.14 24.50 2.81 0.09 0.14 24.80 2.81 0.09 0.13 25.10 2.81 0.09 0.10 25.40 2.81 0.09 0.08 25.70 2.81 0.09 0.06 26.00 2.81 0.09 0.04 26.30 2.81 0.09 0.02 26.60 2.81 0.09 0.02 26.90 2.81 0.09 0.01 27.20 2.81 0.09 0.01 27.50 2.81 0.09 0.00 27.80 2.81 0.09 0.00 28.10 2.81 0.09 0.00 28.40 2.81 0.09 0.00 28.70 2.81 0.09 0.00 29.00 2.81 0.09 0.00 29.30 2.81 0.09 0.00 29.60 2.81 0.09 0.00 29.90 2.81 0.09 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 116HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 24S: PRE-AREA-04A Runoff = 0.14 cfs @ 12.54 hrs, Volume= 0.025 af, Depth= 0.39" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.15 Area (ac) CN Description 0.727 57 Oak/aspen range, Fair, HSG C 0.059 98 Paved parking, HSG C 0.786 60 Weighted Average 0.727 92.49% Pervious Area 0.059 7.51% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.2 12 0.0899 1.06 Sheet Flow, Driveway Pavement Smooth surfaces n= 0.011 P2= 1.33" 44.7 188 0.1357 0.07 Sheet Flow, Oak Brush Woods: Dense underbrush n= 0.800 P2= 1.33" 0.1 8 0.2439 1.23 Shallow Concentrated Flow, Oak Brush Forest w/Heavy Litter Kv= 2.5 fps 45.0 208 Total Subcatchment 24S: PRE-AREA-04A Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type II 24-hr 100-YR Rainfall=2.81" Ia/S=0.15 Runoff Area=0.786 ac Runoff Volume=0.025 af Runoff Depth=0.39" Flow Length=208' Tc=45.0 min CN=60 0.14 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 117HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 24S: PRE-AREA-04A Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.18 0.00 0.00 5.30 0.19 0.00 0.00 5.60 0.21 0.00 0.00 5.90 0.22 0.00 0.00 6.20 0.24 0.00 0.00 6.50 0.25 0.00 0.00 6.80 0.27 0.00 0.00 7.10 0.28 0.00 0.00 7.40 0.30 0.00 0.00 7.70 0.32 0.00 0.00 8.00 0.34 0.00 0.00 8.30 0.36 0.00 0.00 8.60 0.38 0.00 0.00 8.90 0.40 0.00 0.00 9.20 0.43 0.00 0.00 9.50 0.46 0.00 0.00 9.80 0.49 0.00 0.00 10.10 0.52 0.00 0.00 10.40 0.56 0.00 0.00 10.70 0.60 0.00 0.00 11.00 0.66 0.00 0.00 11.30 0.73 0.00 0.00 11.60 0.86 0.00 0.00 11.90 1.60 0.05 0.00 12.20 1.96 0.12 0.06 12.50 2.07 0.15 0.14 12.80 2.13 0.16 0.11 13.10 2.19 0.18 0.07 13.40 2.23 0.19 0.05 13.70 2.27 0.20 0.04 14.00 2.30 0.21 0.03 14.30 2.33 0.22 0.03 14.60 2.36 0.23 0.03 14.90 2.39 0.24 0.02 15.20 2.41 0.25 0.02 15.50 2.44 0.26 0.02 15.80 2.46 0.26 0.02 16.10 2.48 0.27 0.02 16.40 2.50 0.27 0.02 16.70 2.52 0.28 0.02 17.00 2.53 0.29 0.02 17.30 2.55 0.29 0.02 17.60 2.57 0.30 0.02 17.90 2.58 0.30 0.02 18.20 2.60 0.31 0.01 18.50 2.61 0.31 0.01 18.80 2.63 0.32 0.01 19.10 2.64 0.32 0.01 19.40 2.65 0.33 0.01 19.70 2.66 0.33 0.01 20.00 2.68 0.34 0.01 20.30 2.69 0.34 0.01 20.60 2.70 0.34 0.01 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.71 0.35 0.01 21.20 2.72 0.35 0.01 21.50 2.73 0.36 0.01 21.80 2.74 0.36 0.01 22.10 2.75 0.36 0.01 22.40 2.76 0.37 0.01 22.70 2.77 0.37 0.01 23.00 2.78 0.37 0.01 23.30 2.79 0.38 0.01 23.60 2.80 0.38 0.01 23.90 2.81 0.39 0.01 24.20 2.81 0.39 0.01 24.50 2.81 0.39 0.01 24.80 2.81 0.39 0.00 25.10 2.81 0.39 0.00 25.40 2.81 0.39 0.00 25.70 2.81 0.39 0.00 26.00 2.81 0.39 0.00 26.30 2.81 0.39 0.00 26.60 2.81 0.39 0.00 26.90 2.81 0.39 0.00 27.20 2.81 0.39 0.00 27.50 2.81 0.39 0.00 27.80 2.81 0.39 0.00 28.10 2.81 0.39 0.00 28.40 2.81 0.39 0.00 28.70 2.81 0.39 0.00 29.00 2.81 0.39 0.00 29.30 2.81 0.39 0.00 29.60 2.81 0.39 0.00 29.90 2.81 0.39 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 118HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 25S: PRE-AREA-04B Runoff = 0.19 cfs @ 12.36 hrs, Volume= 0.027 af, Depth= 0.42" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.15 Area (ac) CN Description 0.706 57 Oak/aspen range, Fair, HSG C 0.086 98 Paved parking, HSG C 0.792 61 Weighted Average 0.706 89.14% Pervious Area 0.086 10.86% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.8 56 0.0619 1.24 Sheet Flow, Driveway Pavement Smooth surfaces n= 0.011 P2= 1.33" 31.3 144 0.1938 0.08 Sheet Flow, Oak Brush Woods: Dense underbrush n= 0.800 P2= 1.33" 0.4 23 0.1605 1.00 Shallow Concentrated Flow, Oak Brush Forest w/Heavy Litter Kv= 2.5 fps 1.3 105 0.0166 1.32 0.25 Trap/Vee/Rect Channel Flow, Old Irrigation Ditch Bot.W=0.00' D=0.25' Z= 3.0 '/' Top.W=1.50' n= 0.035 Earth, dense weeds 33.8 328 Total Subcatchment 25S: PRE-AREA-04B Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type II 24-hr 100-YR Rainfall=2.81" Ia/S=0.15 Runoff Area=0.792 ac Runoff Volume=0.027 af Runoff Depth=0.42" Flow Length=328' Tc=33.8 min CN=61 0.19 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 119HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 25S: PRE-AREA-04B Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.18 0.00 0.00 5.30 0.19 0.00 0.00 5.60 0.21 0.00 0.00 5.90 0.22 0.00 0.00 6.20 0.24 0.00 0.00 6.50 0.25 0.00 0.00 6.80 0.27 0.00 0.00 7.10 0.28 0.00 0.00 7.40 0.30 0.00 0.00 7.70 0.32 0.00 0.00 8.00 0.34 0.00 0.00 8.30 0.36 0.00 0.00 8.60 0.38 0.00 0.00 8.90 0.40 0.00 0.00 9.20 0.43 0.00 0.00 9.50 0.46 0.00 0.00 9.80 0.49 0.00 0.00 10.10 0.52 0.00 0.00 10.40 0.56 0.00 0.00 10.70 0.60 0.00 0.00 11.00 0.66 0.00 0.00 11.30 0.73 0.00 0.00 11.60 0.86 0.00 0.00 11.90 1.60 0.06 0.00 12.20 1.96 0.14 0.14 12.50 2.07 0.16 0.17 12.80 2.13 0.18 0.09 13.10 2.19 0.20 0.06 13.40 2.23 0.21 0.05 13.70 2.27 0.22 0.04 14.00 2.30 0.23 0.03 14.30 2.33 0.24 0.03 14.60 2.36 0.25 0.03 14.90 2.39 0.26 0.03 15.20 2.41 0.27 0.02 15.50 2.44 0.28 0.02 15.80 2.46 0.29 0.02 16.10 2.48 0.29 0.02 16.40 2.50 0.30 0.02 16.70 2.52 0.31 0.02 17.00 2.53 0.31 0.02 17.30 2.55 0.32 0.02 17.60 2.57 0.32 0.02 17.90 2.58 0.33 0.02 18.20 2.60 0.33 0.02 18.50 2.61 0.34 0.01 18.80 2.63 0.34 0.01 19.10 2.64 0.35 0.01 19.40 2.65 0.35 0.01 19.70 2.66 0.36 0.01 20.00 2.68 0.36 0.01 20.30 2.69 0.37 0.01 20.60 2.70 0.37 0.01 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.71 0.38 0.01 21.20 2.72 0.38 0.01 21.50 2.73 0.38 0.01 21.80 2.74 0.39 0.01 22.10 2.75 0.39 0.01 22.40 2.76 0.40 0.01 22.70 2.77 0.40 0.01 23.00 2.78 0.40 0.01 23.30 2.79 0.41 0.01 23.60 2.80 0.41 0.01 23.90 2.81 0.41 0.01 24.20 2.81 0.42 0.01 24.50 2.81 0.42 0.00 24.80 2.81 0.42 0.00 25.10 2.81 0.42 0.00 25.40 2.81 0.42 0.00 25.70 2.81 0.42 0.00 26.00 2.81 0.42 0.00 26.30 2.81 0.42 0.00 26.60 2.81 0.42 0.00 26.90 2.81 0.42 0.00 27.20 2.81 0.42 0.00 27.50 2.81 0.42 0.00 27.80 2.81 0.42 0.00 28.10 2.81 0.42 0.00 28.40 2.81 0.42 0.00 28.70 2.81 0.42 0.00 29.00 2.81 0.42 0.00 29.30 2.81 0.42 0.00 29.60 2.81 0.42 0.00 29.90 2.81 0.42 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 120HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 26S: PRE-AREA-04C [47] Hint: Peak is 261% of capacity of segment #4 Runoff = 0.88 cfs @ 12.24 hrs, Volume= 0.100 af, Depth= 0.45" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.15 Area (ac) CN Description 2.067 57 Oak/aspen range, Fair, HSG C 0.452 71 Meadow, non-grazed, HSG C 0.185 98 Paved parking, HSG C 2.704 62 Weighted Average 2.519 93.16% Pervious Area 0.185 6.84% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 91 0.0785 1.50 Sheet Flow, Driveway Pavement Smooth surfaces n= 0.011 P2= 1.33" 21.8 109 0.2746 0.08 Sheet Flow, Oak Brush Woods: Dense underbrush n= 0.800 P2= 1.33" 1.2 88 0.2304 1.20 Shallow Concentrated Flow, Oak Brush Forest w/Heavy Litter Kv= 2.5 fps 1.4 148 0.0310 1.80 0.34 Trap/Vee/Rect Channel Flow, Old Irrigation Ditch (Reach 05C) Bot.W=0.00' D=0.25' Z= 3.0 '/' Top.W=1.50' n= 0.035 Earth, dense weeds 0.3 89 0.1423 5.90 2.95 Trap/Vee/Rect Channel Flow, Old Irrigation Ditch (Reach 05D) Bot.W=0.00' D=0.50' Z= 2.0 '/' Top.W=2.00' n= 0.035 Earth, dense weeds 25.7 525 Total Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 121HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcatchment 26S: PRE-AREA-04C Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 100-YR Rainfall=2.81" Ia/S=0.15 Runoff Area=2.704 ac Runoff Volume=0.100 af Runoff Depth=0.45" Flow Length=525' Tc=25.7 min CN=62 0.88 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 122HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 26S: PRE-AREA-04C Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.18 0.00 0.00 5.30 0.19 0.00 0.00 5.60 0.21 0.00 0.00 5.90 0.22 0.00 0.00 6.20 0.24 0.00 0.00 6.50 0.25 0.00 0.00 6.80 0.27 0.00 0.00 7.10 0.28 0.00 0.00 7.40 0.30 0.00 0.00 7.70 0.32 0.00 0.00 8.00 0.34 0.00 0.00 8.30 0.36 0.00 0.00 8.60 0.38 0.00 0.00 8.90 0.40 0.00 0.00 9.20 0.43 0.00 0.00 9.50 0.46 0.00 0.00 9.80 0.49 0.00 0.00 10.10 0.52 0.00 0.00 10.40 0.56 0.00 0.00 10.70 0.60 0.00 0.00 11.00 0.66 0.00 0.00 11.30 0.73 0.00 0.00 11.60 0.86 0.00 0.00 11.90 1.60 0.07 0.04 12.20 1.96 0.15 0.86 12.50 2.07 0.18 0.50 12.80 2.13 0.20 0.27 13.10 2.19 0.22 0.19 13.40 2.23 0.23 0.15 13.70 2.27 0.24 0.13 14.00 2.30 0.26 0.11 14.30 2.33 0.27 0.10 14.60 2.36 0.28 0.09 14.90 2.39 0.28 0.09 15.20 2.41 0.29 0.08 15.50 2.44 0.30 0.08 15.80 2.46 0.31 0.07 16.10 2.48 0.32 0.07 16.40 2.50 0.32 0.06 16.70 2.52 0.33 0.06 17.00 2.53 0.34 0.06 17.30 2.55 0.34 0.06 17.60 2.57 0.35 0.06 17.90 2.58 0.36 0.06 18.20 2.60 0.36 0.05 18.50 2.61 0.37 0.05 18.80 2.63 0.37 0.05 19.10 2.64 0.38 0.05 19.40 2.65 0.38 0.05 19.70 2.66 0.39 0.04 20.00 2.68 0.39 0.04 20.30 2.69 0.40 0.04 20.60 2.70 0.40 0.04 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.71 0.40 0.04 21.20 2.72 0.41 0.04 21.50 2.73 0.41 0.04 21.80 2.74 0.42 0.04 22.10 2.75 0.42 0.04 22.40 2.76 0.42 0.04 22.70 2.77 0.43 0.04 23.00 2.78 0.43 0.04 23.30 2.79 0.44 0.04 23.60 2.80 0.44 0.04 23.90 2.81 0.44 0.04 24.20 2.81 0.45 0.03 24.50 2.81 0.45 0.01 24.80 2.81 0.45 0.00 25.10 2.81 0.45 0.00 25.40 2.81 0.45 0.00 25.70 2.81 0.45 0.00 26.00 2.81 0.45 0.00 26.30 2.81 0.45 0.00 26.60 2.81 0.45 0.00 26.90 2.81 0.45 0.00 27.20 2.81 0.45 0.00 27.50 2.81 0.45 0.00 27.80 2.81 0.45 0.00 28.10 2.81 0.45 0.00 28.40 2.81 0.45 0.00 28.70 2.81 0.45 0.00 29.00 2.81 0.45 0.00 29.30 2.81 0.45 0.00 29.60 2.81 0.45 0.00 29.90 2.81 0.45 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 123HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 30S: PRE-AREA-04D-1 Runoff = 0.67 cfs @ 12.23 hrs, Volume= 0.077 af, Depth= 0.42" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.15 Area (ac) CN Description 1.780 57 Oak/aspen range, Fair, HSG C 0.365 71 Meadow, non-grazed, HSG C 0.075 98 Paved parking, HSG C 2.220 61 Weighted Average 2.145 96.62% Pervious Area 0.075 3.38% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 91 0.0785 1.50 Sheet Flow, Driveway Pavement Smooth surfaces n= 0.011 P2= 1.33" 21.8 109 0.2746 0.08 Sheet Flow, Oak Brush Woods: Dense underbrush n= 0.800 P2= 1.33" 1.2 88 0.2304 1.20 Shallow Concentrated Flow, Oak Brush Forest w/Heavy Litter Kv= 2.5 fps 0.8 225 0.0917 4.76 1.52 Trap/Vee/Rect Channel Flow, Old Irrigation Ditch (Reach 05E) Bot.W=0.00' D=0.40' Z= 2.0 '/' Top.W=1.60' n= 0.030 Earth, grassed & winding 0.2 61 0.0559 4.49 3.37 Trap/Vee/Rect Channel Flow, Old Irrigation Ditch (Reach 05F) Bot.W=0.00' D=0.50' Z= 3.0 '/' Top.W=3.00' n= 0.030 Earth, grassed & winding 25.0 574 Total Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 124HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcatchment 30S: PRE-AREA-04D-1 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 100-YR Rainfall=2.81" Ia/S=0.15 Runoff Area=2.220 ac Runoff Volume=0.077 af Runoff Depth=0.42" Flow Length=574' Tc=25.0 min CN=61 0.67 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 125HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 30S: PRE-AREA-04D-1 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.18 0.00 0.00 5.30 0.19 0.00 0.00 5.60 0.21 0.00 0.00 5.90 0.22 0.00 0.00 6.20 0.24 0.00 0.00 6.50 0.25 0.00 0.00 6.80 0.27 0.00 0.00 7.10 0.28 0.00 0.00 7.40 0.30 0.00 0.00 7.70 0.32 0.00 0.00 8.00 0.34 0.00 0.00 8.30 0.36 0.00 0.00 8.60 0.38 0.00 0.00 8.90 0.40 0.00 0.00 9.20 0.43 0.00 0.00 9.50 0.46 0.00 0.00 9.80 0.49 0.00 0.00 10.10 0.52 0.00 0.00 10.40 0.56 0.00 0.00 10.70 0.60 0.00 0.00 11.00 0.66 0.00 0.00 11.30 0.73 0.00 0.00 11.60 0.86 0.00 0.00 11.90 1.60 0.06 0.03 12.20 1.96 0.14 0.66 12.50 2.07 0.16 0.37 12.80 2.13 0.18 0.20 13.10 2.19 0.20 0.14 13.40 2.23 0.21 0.11 13.70 2.27 0.22 0.10 14.00 2.30 0.23 0.09 14.30 2.33 0.24 0.08 14.60 2.36 0.25 0.07 14.90 2.39 0.26 0.07 15.20 2.41 0.27 0.07 15.50 2.44 0.28 0.06 15.80 2.46 0.29 0.06 16.10 2.48 0.29 0.05 16.40 2.50 0.30 0.05 16.70 2.52 0.31 0.05 17.00 2.53 0.31 0.05 17.30 2.55 0.32 0.05 17.60 2.57 0.32 0.04 17.90 2.58 0.33 0.04 18.20 2.60 0.33 0.04 18.50 2.61 0.34 0.04 18.80 2.63 0.34 0.04 19.10 2.64 0.35 0.04 19.40 2.65 0.35 0.04 19.70 2.66 0.36 0.03 20.00 2.68 0.36 0.03 20.30 2.69 0.37 0.03 20.60 2.70 0.37 0.03 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.71 0.38 0.03 21.20 2.72 0.38 0.03 21.50 2.73 0.38 0.03 21.80 2.74 0.39 0.03 22.10 2.75 0.39 0.03 22.40 2.76 0.40 0.03 22.70 2.77 0.40 0.03 23.00 2.78 0.40 0.03 23.30 2.79 0.41 0.03 23.60 2.80 0.41 0.03 23.90 2.81 0.41 0.03 24.20 2.81 0.42 0.02 24.50 2.81 0.42 0.01 24.80 2.81 0.42 0.00 25.10 2.81 0.42 0.00 25.40 2.81 0.42 0.00 25.70 2.81 0.42 0.00 26.00 2.81 0.42 0.00 26.30 2.81 0.42 0.00 26.60 2.81 0.42 0.00 26.90 2.81 0.42 0.00 27.20 2.81 0.42 0.00 27.50 2.81 0.42 0.00 27.80 2.81 0.42 0.00 28.10 2.81 0.42 0.00 28.40 2.81 0.42 0.00 28.70 2.81 0.42 0.00 29.00 2.81 0.42 0.00 29.30 2.81 0.42 0.00 29.60 2.81 0.42 0.00 29.90 2.81 0.42 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 126HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 32S: PRE-AREA-04D-2 Runoff = 0.37 cfs @ 12.32 hrs, Volume= 0.054 af, Depth= 0.33" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.15 Area (ac) CN Description 1.905 57 Oak/aspen range, Fair, HSG C 0.000 71 Meadow, non-grazed, HSG C 0.055 98 Paved parking, HSG C 1.960 58 Weighted Average 1.905 97.19% Pervious Area 0.055 2.81% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.6 51 0.0757 1.32 Sheet Flow, Driveway Pavement Smooth surfaces n= 0.011 P2= 1.33" 25.6 150 0.3485 0.10 Sheet Flow, Oak Brush Woods: Dense underbrush n= 0.800 P2= 1.33" 0.7 77 0.4857 1.74 Shallow Concentrated Flow, Oak Brush Forest w/Heavy Litter Kv= 2.5 fps 0.7 99 0.0614 2.23 0.54 Trap/Vee/Rect Channel Flow, Channel along old RR Grade Bot.W=0.00' D=0.20' Z= 2.0 & 10.0 '/' Top.W=2.40' n= 0.035 Earth, dense weeds 1.1 186 0.3693 2.82 0.92 Trap/Vee/Rect Channel Flow, Swale down Oak Brush slope Bot.W=4.00' D=0.05' Z= 50.0 '/' Top.W=9.00' n= 0.035 Earth, dense weeds 0.4 54 0.0242 2.32 1.89 Trap/Vee/Rect Channel Flow, Old Irrigation Ditch (Reach 05G) Bot.W=0.00' D=0.54' Z= 3.1 & 2.5 '/' Top.W=3.02' n= 0.040 Earth, cobble bottom, clean sides 0.5 90 0.0445 3.01 2.64 Trap/Vee/Rect Channel Flow, Old Irrigation Ditch (Reach 05H) Bot.W=0.00' D=0.50' Z= 2.0 & 5.0 '/' Top.W=3.50' n= 0.040 Earth, cobble bottom, clean sides 29.6 707 Total Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 127HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcatchment 32S: PRE-AREA-04D-2 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr 100-YR Rainfall=2.81" Ia/S=0.15 Runoff Area=1.960 ac Runoff Volume=0.054 af Runoff Depth=0.33" Flow Length=707' Tc=29.6 min CN=58 0.37 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 128HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 32S: PRE-AREA-04D-2 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.18 0.00 0.00 5.30 0.19 0.00 0.00 5.60 0.21 0.00 0.00 5.90 0.22 0.00 0.00 6.20 0.24 0.00 0.00 6.50 0.25 0.00 0.00 6.80 0.27 0.00 0.00 7.10 0.28 0.00 0.00 7.40 0.30 0.00 0.00 7.70 0.32 0.00 0.00 8.00 0.34 0.00 0.00 8.30 0.36 0.00 0.00 8.60 0.38 0.00 0.00 8.90 0.40 0.00 0.00 9.20 0.43 0.00 0.00 9.50 0.46 0.00 0.00 9.80 0.49 0.00 0.00 10.10 0.52 0.00 0.00 10.40 0.56 0.00 0.00 10.70 0.60 0.00 0.00 11.00 0.66 0.00 0.00 11.30 0.73 0.00 0.00 11.60 0.86 0.00 0.00 11.90 1.60 0.03 0.00 12.20 1.96 0.09 0.31 12.50 2.07 0.12 0.28 12.80 2.13 0.13 0.16 13.10 2.19 0.15 0.11 13.40 2.23 0.16 0.09 13.70 2.27 0.17 0.08 14.00 2.30 0.18 0.07 14.30 2.33 0.18 0.06 14.60 2.36 0.19 0.05 14.90 2.39 0.20 0.05 15.20 2.41 0.21 0.05 15.50 2.44 0.21 0.05 15.80 2.46 0.22 0.04 16.10 2.48 0.22 0.04 16.40 2.50 0.23 0.04 16.70 2.52 0.24 0.04 17.00 2.53 0.24 0.04 17.30 2.55 0.25 0.04 17.60 2.57 0.25 0.03 17.90 2.58 0.26 0.03 18.20 2.60 0.26 0.03 18.50 2.61 0.27 0.03 18.80 2.63 0.27 0.03 19.10 2.64 0.27 0.03 19.40 2.65 0.28 0.03 19.70 2.66 0.28 0.03 20.00 2.68 0.29 0.03 20.30 2.69 0.29 0.02 20.60 2.70 0.29 0.02 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.71 0.30 0.02 21.20 2.72 0.30 0.02 21.50 2.73 0.30 0.02 21.80 2.74 0.31 0.02 22.10 2.75 0.31 0.02 22.40 2.76 0.31 0.02 22.70 2.77 0.32 0.02 23.00 2.78 0.32 0.02 23.30 2.79 0.32 0.02 23.60 2.80 0.33 0.02 23.90 2.81 0.33 0.02 24.20 2.81 0.33 0.02 24.50 2.81 0.33 0.01 24.80 2.81 0.33 0.00 25.10 2.81 0.33 0.00 25.40 2.81 0.33 0.00 25.70 2.81 0.33 0.00 26.00 2.81 0.33 0.00 26.30 2.81 0.33 0.00 26.60 2.81 0.33 0.00 26.90 2.81 0.33 0.00 27.20 2.81 0.33 0.00 27.50 2.81 0.33 0.00 27.80 2.81 0.33 0.00 28.10 2.81 0.33 0.00 28.40 2.81 0.33 0.00 28.70 2.81 0.33 0.00 29.00 2.81 0.33 0.00 29.30 2.81 0.33 0.00 29.60 2.81 0.33 0.00 29.90 2.81 0.33 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 129HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 9R: Reach 7A-6 Inflow = 0.48 cfs @ 12.73 hrs, Volume= 0.049 af Outflow = 0.48 cfs @ 12.77 hrs, Volume= 0.049 af, Atten= 1%, Lag= 2.1 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 3.26 fps, Min. Travel Time= 3.2 min Avg. Velocity = 1.78 fps, Avg. Travel Time= 5.9 min Peak Storage= 92 cf @ 12.77 hrs Average Depth at Peak Storage= 0.24' , Surface Width= 1.21' Bank-Full Depth= 1.00' Flow Area= 2.5 sf, Capacity= 21.00 cfs 0.00' x 1.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 2.5 '/' Top Width= 5.00' Length= 626.8' Slope= 0.0800 '/' Inlet Invert= 6,994.87', Outlet Invert= 6,944.72' Reach 9R: Reach 7A-6 Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Avg. Flow Depth=0.24' Max Vel=3.26 fps n=0.030 L=626.8' S=0.0800 '/' Capacity=21.00 cfs 0.48 cfs0.48 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 130HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 9R: Reach 7A-6 Primary Stage-Discharge Discharge (cfs) 20181614121086420Depth (feet)1 0 Reach 9R: Reach 7A-6 Storage Stage-Storage Storage (cubic-feet) 1,5001,4001,3001,2001,1001,0009008007006005004003002001000Depth (feet)1 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 131HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 9R: Reach 7A-6 Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,994.87 0.00 5.60 0.00 0 6,994.87 0.00 6.20 0.00 0 6,994.87 0.00 6.80 0.00 0 6,994.87 0.00 7.40 0.00 0 6,994.87 0.00 8.00 0.00 0 6,994.87 0.00 8.60 0.00 0 6,994.87 0.00 9.20 0.00 0 6,994.87 0.00 9.80 0.00 0 6,994.87 0.00 10.40 0.00 0 6,994.87 0.00 11.00 0.00 0 6,994.87 0.00 11.60 0.00 0 6,994.87 0.00 12.20 0.02 1 6,994.90 0.00 12.80 0.47 92 6,995.11 0.48 13.40 0.23 55 6,995.06 0.24 14.00 0.11 32 6,995.01 0.12 14.60 0.06 20 6,994.98 0.06 15.20 0.03 12 6,994.96 0.03 15.80 0.01 7 6,994.94 0.02 16.40 0.00 2 6,994.91 0.00 17.00 0.00 0 6,994.88 0.00 17.60 0.00 0 6,994.87 0.00 18.20 0.00 0 6,994.87 0.00 18.80 0.00 0 6,994.87 0.00 19.40 0.00 0 6,994.87 0.00 20.00 0.00 0 6,994.87 0.00 20.60 0.00 0 6,994.87 0.00 21.20 0.00 0 6,994.87 0.00 21.80 0.00 0 6,994.87 0.00 22.40 0.00 0 6,994.87 0.00 23.00 0.00 0 6,994.87 0.00 23.60 0.00 0 6,994.87 0.00 24.20 0.00 0 6,994.87 0.00 24.80 0.00 0 6,994.87 0.00 25.40 0.00 0 6,994.87 0.00 26.00 0.00 0 6,994.87 0.00 26.60 0.00 0 6,994.87 0.00 27.20 0.00 0 6,994.87 0.00 27.80 0.00 0 6,994.87 0.00 28.40 0.00 0 6,994.87 0.00 29.00 0.00 0 6,994.87 0.00 29.60 0.00 0 6,994.87 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 132HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 9R: Reach 7A-6 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,994.87 0.00 0.00 6,994.88 0.39 0.00 6,994.89 0.62 0.00 6,994.90 0.81 0.00 6,994.91 0.98 0.00 6,994.92 1.14 0.01 6,994.93 1.29 0.01 6,994.94 1.43 0.02 6,994.95 1.56 0.02 6,994.96 1.69 0.03 6,994.97 1.81 0.05 6,994.98 1.93 0.06 6,994.99 2.04 0.07 6,995.00 2.16 0.09 6,995.01 2.26 0.11 6,995.02 2.37 0.13 6,995.03 2.48 0.16 6,995.04 2.58 0.19 6,995.05 2.68 0.22 6,995.06 2.78 0.25 6,995.07 2.87 0.29 6,995.08 2.97 0.33 6,995.09 3.06 0.37 6,995.10 3.15 0.42 6,995.11 3.24 0.47 6,995.12 3.33 0.52 6,995.13 3.42 0.58 6,995.14 3.51 0.64 6,995.15 3.60 0.70 6,995.16 3.68 0.77 6,995.17 3.76 0.85 6,995.18 3.85 0.92 6,995.19 3.93 1.01 6,995.20 4.01 1.09 6,995.21 4.09 1.18 6,995.22 4.17 1.28 6,995.23 4.25 1.38 6,995.24 4.33 1.48 6,995.25 4.41 1.59 6,995.26 4.48 1.71 6,995.27 4.56 1.82 6,995.28 4.64 1.95 6,995.29 4.71 2.08 6,995.30 4.79 2.21 6,995.31 4.86 2.35 6,995.32 4.93 2.50 6,995.33 5.01 2.65 6,995.34 5.08 2.80 6,995.35 5.15 2.97 6,995.36 5.22 3.13 6,995.37 5.29 3.31 6,995.38 5.36 3.49 6,995.39 5.43 3.67 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,995.40 5.50 3.86 6,995.41 5.57 4.06 6,995.42 5.64 4.26 6,995.43 5.71 4.47 6,995.44 5.77 4.69 6,995.45 5.84 4.91 6,995.46 5.91 5.14 6,995.47 5.98 5.38 6,995.48 6.04 5.62 6,995.49 6.11 5.87 6,995.50 6.17 6.13 6,995.51 6.24 6.39 6,995.52 6.30 6.66 6,995.53 6.37 6.93 6,995.54 6.43 7.22 6,995.55 6.50 7.51 6,995.56 6.56 7.81 6,995.57 6.62 8.11 6,995.58 6.69 8.43 6,995.59 6.75 8.75 6,995.60 6.81 9.07 6,995.61 6.87 9.41 6,995.62 6.93 9.75 6,995.63 7.00 10.10 6,995.64 7.06 10.46 6,995.65 7.12 10.83 6,995.66 7.18 11.20 6,995.67 7.24 11.58 6,995.68 7.30 11.97 6,995.69 7.36 12.37 6,995.70 7.42 12.78 6,995.71 7.48 13.19 6,995.72 7.54 13.62 6,995.73 7.60 14.05 6,995.74 7.66 14.49 6,995.75 7.71 14.93 6,995.76 7.77 15.39 6,995.77 7.83 15.86 6,995.78 7.89 16.33 6,995.79 7.95 16.81 6,995.80 8.00 17.31 6,995.81 8.06 17.81 6,995.82 8.12 18.32 6,995.83 8.17 18.83 6,995.84 8.23 19.36 6,995.85 8.29 19.90 6,995.86 8.34 20.45 6,995.87 8.40 21.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 133HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 9R: Reach 7A-6 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,994.87 0.0 0 6,994.88 0.0 0 6,994.89 0.0 1 6,994.90 0.0 1 6,994.91 0.0 3 6,994.92 0.0 4 6,994.93 0.0 6 6,994.94 0.0 8 6,994.95 0.0 10 6,994.96 0.0 13 6,994.97 0.0 16 6,994.98 0.0 19 6,994.99 0.0 23 6,995.00 0.0 26 6,995.01 0.0 31 6,995.02 0.1 35 6,995.03 0.1 40 6,995.04 0.1 45 6,995.05 0.1 51 6,995.06 0.1 57 6,995.07 0.1 63 6,995.08 0.1 69 6,995.09 0.1 76 6,995.10 0.1 83 6,995.11 0.1 90 6,995.12 0.2 98 6,995.13 0.2 106 6,995.14 0.2 114 6,995.15 0.2 123 6,995.16 0.2 132 6,995.17 0.2 141 6,995.18 0.2 151 6,995.19 0.3 160 6,995.20 0.3 171 6,995.21 0.3 181 6,995.22 0.3 192 6,995.23 0.3 203 6,995.24 0.3 215 6,995.25 0.4 226 6,995.26 0.4 238 6,995.27 0.4 251 6,995.28 0.4 263 6,995.29 0.4 276 6,995.30 0.5 290 6,995.31 0.5 303 6,995.32 0.5 317 6,995.33 0.5 332 6,995.34 0.6 346 6,995.35 0.6 361 6,995.36 0.6 376 6,995.37 0.6 392 6,995.38 0.7 408 6,995.39 0.7 424 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,995.40 0.7 440 6,995.41 0.7 457 6,995.42 0.8 474 6,995.43 0.8 491 6,995.44 0.8 509 6,995.45 0.8 527 6,995.46 0.9 545 6,995.47 0.9 564 6,995.48 0.9 583 6,995.49 1.0 602 6,995.50 1.0 622 6,995.51 1.0 642 6,995.52 1.1 662 6,995.53 1.1 683 6,995.54 1.1 703 6,995.55 1.2 725 6,995.56 1.2 746 6,995.57 1.2 768 6,995.58 1.3 790 6,995.59 1.3 812 6,995.60 1.3 835 6,995.61 1.4 858 6,995.62 1.4 881 6,995.63 1.4 905 6,995.64 1.5 929 6,995.65 1.5 953 6,995.66 1.6 978 6,995.67 1.6 1,003 6,995.68 1.6 1,028 6,995.69 1.7 1,054 6,995.70 1.7 1,080 6,995.71 1.8 1,106 6,995.72 1.8 1,132 6,995.73 1.8 1,159 6,995.74 1.9 1,186 6,995.75 1.9 1,213 6,995.76 2.0 1,241 6,995.77 2.0 1,269 6,995.78 2.1 1,298 6,995.79 2.1 1,326 6,995.80 2.2 1,355 6,995.81 2.2 1,385 6,995.82 2.3 1,414 6,995.83 2.3 1,444 6,995.84 2.4 1,474 6,995.85 2.4 1,505 6,995.86 2.5 1,536 6,995.87 2.5 1,567 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 134HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 13R: PRE-AREA-06-CULVERT [52] Hint: Inlet/Outlet conditions not evaluated [62] Hint: Exceeded Reach 9R OUTLET depth by 0.83' @ 17.54 hrs Inflow Area = 76.472 ac, 0.00% Impervious, Inflow Depth = 0.09" for 100-YR event Inflow = 0.89 cfs @ 14.03 hrs, Volume= 0.598 af Outflow = 0.89 cfs @ 14.03 hrs, Volume= 0.598 af, Atten= 0%, Lag= 0.1 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 2.62 fps, Min. Travel Time= 0.2 min Avg. Velocity = 1.80 fps, Avg. Travel Time= 0.3 min Peak Storage= 10 cf @ 14.03 hrs Average Depth at Peak Storage= 0.89' above invert (0.23' above fill) , Surface Width= 1.47' Bank-Full Depth= 1.50' above invert (0.83' above fill) Flow Area= 1.0 sf, Capacity= 3.37 cfs 18.0" Round Pipe w/ 8.0" inside fill n= 0.025 Corrugated metal Length= 30.0' Slope= 0.0200 '/' (101 Elevation Intervals) Inlet Invert= 6,944.72', Outlet Invert= 6,944.12' Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 135HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 13R: PRE-AREA-06-CULVERT Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=76.472 ac Avg. Flow Depth=0.23' Max Vel=2.62 fps 18.0" Round Pipe w/ 8.0" inside fill n=0.025 L=30.0' S=0.0200 '/' Capacity=3.37 cfs 0.89 cfs0.89 cfs Reach 13R: PRE-AREA-06-CULVERT Primary Stage-Discharge Discharge (cfs) 3210Depth (feet)1 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 136HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 13R: PRE-AREA-06-CULVERT Storage Stage-Storage Storage (cubic-feet) 302826242220181614121086420Depth (feet)1 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 137HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 13R: PRE-AREA-06-CULVERT Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,945.39 0.00 5.60 0.00 0 6,945.39 0.00 6.20 0.00 0 6,945.39 0.00 6.80 0.00 0 6,945.39 0.00 7.40 0.00 0 6,945.39 0.00 8.00 0.00 0 6,945.39 0.00 8.60 0.00 0 6,945.39 0.00 9.20 0.00 0 6,945.39 0.00 9.80 0.00 0 6,945.39 0.00 10.40 0.00 0 6,945.39 0.00 11.00 0.00 0 6,945.39 0.00 11.60 0.00 0 6,945.39 0.00 12.20 0.00 0 6,945.39 0.00 12.80 0.63 8 6,945.57 0.63 13.40 0.79 9 6,945.60 0.79 14.00 0.89 10 6,945.61 0.89 14.60 0.85 10 6,945.61 0.85 15.20 0.78 9 6,945.59 0.78 15.80 0.72 9 6,945.58 0.72 16.40 0.66 8 6,945.57 0.66 17.00 0.61 8 6,945.56 0.61 17.60 0.57 8 6,945.56 0.57 18.20 0.55 7 6,945.55 0.55 18.80 0.52 7 6,945.55 0.52 19.40 0.50 7 6,945.54 0.50 20.00 0.47 7 6,945.54 0.47 20.60 0.44 6 6,945.53 0.44 21.20 0.42 6 6,945.52 0.42 21.80 0.40 6 6,945.52 0.40 22.40 0.39 6 6,945.52 0.39 23.00 0.39 6 6,945.52 0.39 23.60 0.39 6 6,945.52 0.39 24.20 0.38 6 6,945.52 0.38 24.80 0.33 5 6,945.51 0.33 25.40 0.19 4 6,945.47 0.19 26.00 0.08 2 6,945.44 0.08 26.60 0.03 1 6,945.41 0.03 27.20 0.01 1 6,945.40 0.01 27.80 0.01 0 6,945.40 0.01 28.40 0.00 0 6,945.39 0.00 29.00 0.00 0 6,945.39 0.00 29.60 0.00 0 6,945.39 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 138HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 13R: PRE-AREA-06-CULVERT Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,944.72 0.00 0.00 6,944.73 0.00 0.00 6,944.74 0.00 0.00 6,944.75 0.00 0.00 6,944.76 0.00 0.00 6,944.77 0.00 0.00 6,944.78 0.00 0.00 6,944.79 0.00 0.00 6,944.80 0.00 0.00 6,944.81 0.00 0.00 6,944.82 0.00 0.00 6,944.83 0.00 0.00 6,944.84 0.00 0.00 6,944.85 0.00 0.00 6,944.86 0.00 0.00 6,944.87 0.00 0.00 6,944.88 0.00 0.00 6,944.89 0.00 0.00 6,944.90 0.00 0.00 6,944.91 0.00 0.00 6,944.92 0.00 0.00 6,944.93 0.00 0.00 6,944.94 0.00 0.00 6,944.95 0.00 0.00 6,944.96 0.00 0.00 6,944.97 0.00 0.00 6,944.98 0.00 0.00 6,944.99 0.00 0.00 6,945.00 0.00 0.00 6,945.01 0.00 0.00 6,945.02 0.00 0.00 6,945.03 0.00 0.00 6,945.04 0.00 0.00 6,945.05 0.00 0.00 6,945.06 0.00 0.00 6,945.07 0.00 0.00 6,945.08 0.00 0.00 6,945.09 0.00 0.00 6,945.10 0.00 0.00 6,945.11 0.00 0.00 6,945.12 0.00 0.00 6,945.13 0.00 0.00 6,945.14 0.00 0.00 6,945.15 0.00 0.00 6,945.16 0.00 0.00 6,945.17 0.00 0.00 6,945.18 0.00 0.00 6,945.19 0.00 0.00 6,945.20 0.00 0.00 6,945.21 0.00 0.00 6,945.22 0.00 0.00 6,945.23 0.00 0.00 6,945.24 0.00 0.00 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,945.25 0.00 0.00 6,945.26 0.00 0.00 6,945.27 0.00 0.00 6,945.28 0.00 0.00 6,945.29 0.00 0.00 6,945.30 0.00 0.00 6,945.31 0.00 0.00 6,945.32 0.00 0.00 6,945.33 0.00 0.00 6,945.34 0.00 0.00 6,945.35 0.00 0.00 6,945.36 0.00 0.00 6,945.37 0.00 0.00 6,945.38 0.00 0.00 6,945.39 0.14 0.00 6,945.40 0.45 0.01 6,945.41 0.67 0.02 6,945.42 0.84 0.04 6,945.43 1.00 0.07 6,945.44 1.14 0.09 6,945.45 1.27 0.12 6,945.46 1.38 0.15 6,945.47 1.50 0.19 6,945.48 1.60 0.22 6,945.49 1.70 0.26 6,945.50 1.80 0.30 6,945.51 1.89 0.35 6,945.52 1.97 0.39 6,945.53 2.05 0.44 6,945.54 2.13 0.49 6,945.55 2.21 0.54 6,945.56 2.28 0.59 6,945.57 2.35 0.64 6,945.58 2.41 0.70 6,945.59 2.48 0.75 6,945.60 2.54 0.81 6,945.61 2.60 0.87 6,945.62 2.66 0.93 6,945.63 2.71 0.98 6,945.64 2.77 1.04 6,945.65 2.82 1.10 6,945.66 2.87 1.17 6,945.67 2.91 1.23 6,945.68 2.96 1.29 6,945.69 3.01 1.35 6,945.70 3.05 1.42 6,945.71 3.09 1.48 6,945.72 3.13 1.54 6,945.73 3.17 1.61 6,945.74 3.21 1.67 6,945.75 3.24 1.73 6,945.76 3.28 1.80 6,945.77 3.31 1.86 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,945.78 3.34 1.93 6,945.79 3.37 1.99 6,945.80 3.40 2.05 6,945.81 3.43 2.12 6,945.82 3.46 2.18 6,945.83 3.49 2.24 6,945.84 3.51 2.30 6,945.85 3.53 2.37 6,945.86 3.56 2.43 6,945.87 3.58 2.49 6,945.88 3.60 2.55 6,945.89 3.62 2.61 6,945.90 3.64 2.66 6,945.91 3.65 2.72 6,945.92 3.67 2.78 6,945.93 3.68 2.83 6,945.94 3.70 2.89 6,945.95 3.71 2.94 6,945.96 3.72 2.99 6,945.97 3.73 3.04 6,945.98 3.74 3.09 6,945.99 3.75 3.14 6,946.00 3.76 3.18 6,946.01 3.76 3.23 6,946.02 3.77 3.27 6,946.03 3.77 3.31 6,946.04 3.77 3.35 6,946.05 3.77 3.39 6,946.06 3.77 3.42 6,946.07 3.77 3.46 6,946.08 3.77 3.49 6,946.09 3.76 3.51 6,946.10 3.76 3.54 6,946.11 3.75 3.56 6,946.12 3.74 3.58 6,946.13 3.72 3.59 6,946.14 3.71 3.61 6,946.15 3.69 3.61 6,946.16 3.67 3.62 6,946.17 3.65 3.61 6,946.18 3.62 3.60 6,946.19 3.59 3.59 6,946.20 3.54 3.55 6,946.21 3.46 3.48 6,946.22 3.35 3.37 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 139HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 13R: PRE-AREA-06-CULVERT Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,944.72 0.0 0 6,944.74 0.0 0 6,944.76 0.0 0 6,944.78 0.0 0 6,944.80 0.0 0 6,944.82 0.0 0 6,944.84 0.0 0 6,944.86 0.0 0 6,944.88 0.0 0 6,944.90 0.0 0 6,944.92 0.0 0 6,944.94 0.0 0 6,944.96 0.0 0 6,944.98 0.0 0 6,945.00 0.0 0 6,945.02 0.0 0 6,945.04 0.0 0 6,945.06 0.0 0 6,945.08 0.0 0 6,945.10 0.0 0 6,945.12 0.0 0 6,945.14 0.0 0 6,945.16 0.0 0 6,945.18 0.0 0 6,945.20 0.0 0 6,945.22 0.0 0 6,945.24 0.0 0 6,945.26 0.0 0 6,945.28 0.0 0 6,945.30 0.0 0 6,945.32 0.0 0 6,945.34 0.0 0 6,945.36 0.0 0 6,945.38 0.0 0 6,945.40 0.0 1 6,945.42 0.0 1 6,945.44 0.1 2 6,945.46 0.1 3 6,945.48 0.1 4 6,945.50 0.2 5 6,945.52 0.2 6 6,945.54 0.2 7 6,945.56 0.3 8 6,945.58 0.3 9 6,945.60 0.3 10 6,945.62 0.3 10 6,945.64 0.4 11 6,945.66 0.4 12 6,945.68 0.4 13 6,945.70 0.5 14 6,945.72 0.5 15 6,945.74 0.5 16 6,945.76 0.5 16 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,945.78 0.6 17 6,945.80 0.6 18 6,945.82 0.6 19 6,945.84 0.7 20 6,945.86 0.7 20 6,945.88 0.7 21 6,945.90 0.7 22 6,945.92 0.8 23 6,945.94 0.8 23 6,945.96 0.8 24 6,945.98 0.8 25 6,946.00 0.8 25 6,946.02 0.9 26 6,946.04 0.9 27 6,946.06 0.9 27 6,946.08 0.9 28 6,946.10 0.9 28 6,946.12 1.0 29 6,946.14 1.0 29 6,946.16 1.0 30 6,946.18 1.0 30 6,946.20 1.0 30 6,946.22 1.0 30 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 140HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 14R: Reach-07A Inflow Area = 5.631 ac, 0.00% Impervious, Inflow Depth = 0.20" for 100-YR event Inflow = 0.12 cfs @ 12.73 hrs, Volume= 0.094 af Outflow = 0.12 cfs @ 12.77 hrs, Volume= 0.094 af, Atten= 0%, Lag= 2.5 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 1.44 fps, Min. Travel Time= 4.1 min Avg. Velocity = 1.15 fps, Avg. Travel Time= 5.1 min Peak Storage= 30 cf @ 12.77 hrs Average Depth at Peak Storage= 0.02' , Surface Width= 5.72' Bank-Full Depth= 0.25' Flow Area= 4.1 sf, Capacity= 26.97 cfs 4.00' x 0.25' deep channel, n= 0.035 Earth, dense weeds Side Slope Z-value= 50.0 '/' Top Width= 29.00' Length= 355.0' Slope= 0.3195 '/' Inlet Invert= 6,991.77', Outlet Invert= 6,878.33' ‡ Reach 14R: Reach-07A Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=5.631 ac Avg. Flow Depth=0.02' Max Vel=1.44 fps n=0.035 L=355.0' S=0.3195 '/' Capacity=26.97 cfs 0.12 cfs0.12 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 141HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 14R: Reach-07A Primary Stage-Discharge Discharge (cfs) 26242220181614121086420Depth (feet)0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Reach 14R: Reach-07A Storage Stage-Storage Storage (cubic-feet) 1,4001,2001,0008006004002000Depth (feet)0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 142HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 14R: Reach-07A Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,991.77 0.00 5.60 0.00 0 6,991.77 0.00 6.20 0.00 0 6,991.77 0.00 6.80 0.00 0 6,991.77 0.00 7.40 0.00 0 6,991.77 0.00 8.00 0.00 0 6,991.77 0.00 8.60 0.00 0 6,991.77 0.00 9.20 0.00 0 6,991.77 0.00 9.80 0.00 0 6,991.77 0.00 10.40 0.00 0 6,991.77 0.00 11.00 0.00 0 6,991.77 0.00 11.60 0.00 0 6,991.77 0.00 12.20 0.11 24 6,991.78 0.09 12.80 0.12 30 6,991.79 0.12 13.40 0.12 29 6,991.79 0.12 14.00 0.12 29 6,991.79 0.12 14.60 0.12 29 6,991.79 0.12 15.20 0.12 29 6,991.79 0.12 15.80 0.11 29 6,991.79 0.11 16.40 0.11 29 6,991.79 0.11 17.00 0.10 27 6,991.79 0.10 17.60 0.10 26 6,991.79 0.10 18.20 0.09 25 6,991.78 0.09 18.80 0.09 24 6,991.78 0.09 19.40 0.08 23 6,991.78 0.08 20.00 0.07 22 6,991.78 0.07 20.60 0.07 20 6,991.78 0.07 21.20 0.06 20 6,991.78 0.06 21.80 0.06 19 6,991.78 0.06 22.40 0.06 19 6,991.78 0.06 23.00 0.06 19 6,991.78 0.06 23.60 0.06 19 6,991.78 0.06 24.20 0.06 19 6,991.78 0.06 24.80 0.03 13 6,991.78 0.03 25.40 0.01 5 6,991.77 0.01 26.00 0.00 2 6,991.77 0.00 26.60 0.00 0 6,991.77 0.00 27.20 0.00 0 6,991.77 0.00 27.80 0.00 0 6,991.77 0.00 28.40 0.00 0 6,991.77 0.00 29.00 0.00 0 6,991.77 0.00 29.60 0.00 0 6,991.77 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 143HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 14R: Reach-07A Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,991.77 0.00 0.00 6,991.78 1.04 0.05 6,991.79 1.57 0.16 6,991.80 1.97 0.33 6,991.81 2.32 0.56 6,991.82 2.62 0.85 6,991.83 2.90 1.22 6,991.84 3.16 1.66 6,991.85 3.40 2.18 6,991.86 3.63 2.78 6,991.87 3.85 3.47 6,991.88 4.06 4.25 6,991.89 4.27 5.12 6,991.90 4.47 6.10 6,991.91 4.66 7.18 6,991.92 4.85 8.36 6,991.93 5.03 9.66 6,991.94 5.21 11.07 6,991.95 5.39 12.61 6,991.96 5.56 14.26 6,991.97 5.73 16.04 6,991.98 5.90 17.96 6,991.99 6.06 20.00 6,992.00 6.22 22.18 6,992.01 6.38 24.51 6,992.02 6.54 26.97 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 144HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 14R: Reach-07A Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,991.77 0.0 0 6,991.78 0.0 16 6,991.79 0.1 36 6,991.80 0.2 59 6,991.81 0.2 85 6,991.82 0.3 115 6,991.83 0.4 149 6,991.84 0.5 186 6,991.85 0.6 227 6,991.86 0.8 272 6,991.87 0.9 320 6,991.88 1.0 371 6,991.89 1.2 426 6,991.90 1.4 485 6,991.91 1.5 547 6,991.92 1.7 612 6,991.93 1.9 682 6,991.94 2.1 754 6,991.95 2.3 831 6,991.96 2.6 911 6,991.97 2.8 994 6,991.98 3.0 1,081 6,991.99 3.3 1,172 6,992.00 3.6 1,266 6,992.01 3.8 1,363 6,992.02 4.1 1,464 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 145HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 15R: Reach-06 [61] Hint: Exceeded Reach 13R outlet invert by 0.05' @ 14.06 hrs Inflow Area = 76.472 ac, 0.00% Impervious, Inflow Depth = 0.09" for 100-YR event Inflow = 0.89 cfs @ 14.03 hrs, Volume= 0.598 af Outflow = 0.89 cfs @ 14.05 hrs, Volume= 0.598 af, Atten= 0%, Lag= 1.0 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 2.46 fps, Min. Travel Time= 1.3 min Avg. Velocity = 1.75 fps, Avg. Travel Time= 1.8 min Peak Storage= 68 cf @ 14.05 hrs Average Depth at Peak Storage= 0.05' , Surface Width= 9.40' Bank-Full Depth= 0.25' Flow Area= 4.1 sf, Capacity= 24.22 cfs 4.00' x 0.25' deep channel, n= 0.035 Earth, dense weeds Side Slope Z-value= 50.0 '/' Top Width= 29.00' Length= 188.3' Slope= 0.2577 '/' Inlet Invert= 6,944.12', Outlet Invert= 6,895.60' ‡ Reach 15R: Reach-06 Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=76.472 ac Avg. Flow Depth=0.05' Max Vel=2.46 fps n=0.035 L=188.3' S=0.2577 '/' Capacity=24.22 cfs 0.89 cfs0.89 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 146HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 15R: Reach-06 Primary Stage-Discharge Discharge (cfs) 242220181614121086420Depth (feet)0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Reach 15R: Reach-06 Storage Stage-Storage Storage (cubic-feet) 7006005004003002001000Depth (feet)0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 147HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 15R: Reach-06 Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,944.12 0.00 5.60 0.00 0 6,944.12 0.00 6.20 0.00 0 6,944.12 0.00 6.80 0.00 0 6,944.12 0.00 7.40 0.00 0 6,944.12 0.00 8.00 0.00 0 6,944.12 0.00 8.60 0.00 0 6,944.12 0.00 9.20 0.00 0 6,944.12 0.00 9.80 0.00 0 6,944.12 0.00 10.40 0.00 0 6,944.12 0.00 11.00 0.00 0 6,944.12 0.00 11.60 0.00 0 6,944.12 0.00 12.20 0.00 0 6,944.12 0.00 12.80 0.63 53 6,944.16 0.62 13.40 0.79 62 6,944.17 0.78 14.00 0.89 68 6,944.17 0.89 14.60 0.85 66 6,944.17 0.85 15.20 0.78 62 6,944.17 0.78 15.80 0.72 59 6,944.17 0.72 16.40 0.66 55 6,944.17 0.66 17.00 0.61 52 6,944.16 0.61 17.60 0.57 50 6,944.16 0.57 18.20 0.55 48 6,944.16 0.55 18.80 0.52 47 6,944.16 0.52 19.40 0.50 45 6,944.16 0.50 20.00 0.47 44 6,944.16 0.47 20.60 0.44 42 6,944.16 0.44 21.20 0.42 40 6,944.16 0.42 21.80 0.40 39 6,944.16 0.40 22.40 0.39 38 6,944.16 0.39 23.00 0.39 38 6,944.16 0.39 23.60 0.39 38 6,944.15 0.39 24.20 0.38 38 6,944.15 0.38 24.80 0.33 34 6,944.15 0.34 25.40 0.19 24 6,944.14 0.20 26.00 0.08 13 6,944.13 0.08 26.60 0.03 7 6,944.13 0.03 27.20 0.01 4 6,944.13 0.01 27.80 0.01 2 6,944.12 0.01 28.40 0.00 1 6,944.12 0.00 29.00 0.00 0 6,944.12 0.00 29.60 0.00 0 6,944.12 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 148HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 15R: Reach-06 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,944.12 0.00 0.00 6,944.13 0.93 0.04 6,944.14 1.41 0.14 6,944.15 1.77 0.29 6,944.16 2.08 0.50 6,944.17 2.35 0.77 6,944.18 2.60 1.09 6,944.19 2.84 1.49 6,944.20 3.05 1.95 6,944.21 3.26 2.49 6,944.22 3.46 3.11 6,944.23 3.65 3.81 6,944.24 3.83 4.60 6,944.25 4.01 5.47 6,944.26 4.18 6.44 6,944.27 4.35 7.51 6,944.28 4.52 8.67 6,944.29 4.68 9.94 6,944.30 4.84 11.32 6,944.31 4.99 12.81 6,944.32 5.15 14.41 6,944.33 5.30 16.12 6,944.34 5.44 17.96 6,944.35 5.59 19.92 6,944.36 5.73 22.01 6,944.37 5.87 24.22 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 149HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 15R: Reach-06 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,944.12 0.0 0 6,944.13 0.0 8 6,944.14 0.1 19 6,944.15 0.2 31 6,944.16 0.2 45 6,944.17 0.3 61 6,944.18 0.4 79 6,944.19 0.5 99 6,944.20 0.6 121 6,944.21 0.8 144 6,944.22 0.9 169 6,944.23 1.0 197 6,944.24 1.2 226 6,944.25 1.4 257 6,944.26 1.5 290 6,944.27 1.7 325 6,944.28 1.9 362 6,944.29 2.1 400 6,944.30 2.3 441 6,944.31 2.6 483 6,944.32 2.8 527 6,944.33 3.0 573 6,944.34 3.3 621 6,944.35 3.6 671 6,944.36 3.8 723 6,944.37 4.1 777 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 150HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 16R: PRE-AREA-05-CULVERT [52] Hint: Inlet/Outlet conditions not evaluated Inflow Area = 27.686 ac, 0.00% Impervious, Inflow Depth = 0.09" for 100-YR event Inflow = 0.28 cfs @ 14.52 hrs, Volume= 0.199 af Outflow = 0.28 cfs @ 14.52 hrs, Volume= 0.199 af, Atten= 0%, Lag= 0.2 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 3.15 fps, Min. Travel Time= 0.2 min Avg. Velocity = 2.14 fps, Avg. Travel Time= 0.2 min Peak Storage= 3 cf @ 14.52 hrs Average Depth at Peak Storage= 0.51' above invert (0.09' above fill) , Surface Width= 1.00' Bank-Full Depth= 1.00' above invert (0.58' above fill) Flow Area= 0.5 sf, Capacity= 2.60 cfs 12.0" Round Pipe w/ 5.0" inside fill n= 0.012 Corrugated PP, smooth interior Length= 30.0' Slope= 0.0200 '/' Inlet Invert= 6,923.48', Outlet Invert= 6,922.88' Reach 16R: PRE-AREA-05-CULVERT Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=27.686 ac Avg. Flow Depth=0.09' Max Vel=3.15 fps 12.0" Round Pipe w/ 5.0" inside fill n=0.012 L=30.0' S=0.0200 '/' Capacity=2.60 cfs 0.28 cfs0.28 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 151HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 16R: PRE-AREA-05-CULVERT Primary Stage-Discharge Discharge (cfs) 210Depth (feet)1 0 Reach 16R: PRE-AREA-05-CULVERT Storage Stage-Storage Storage (cubic-feet) 14131211109876543210Depth (feet)1 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 152HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 16R: PRE-AREA-05-CULVERT Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,923.90 0.00 5.60 0.00 0 6,923.90 0.00 6.20 0.00 0 6,923.90 0.00 6.80 0.00 0 6,923.90 0.00 7.40 0.00 0 6,923.90 0.00 8.00 0.00 0 6,923.90 0.00 8.60 0.00 0 6,923.90 0.00 9.20 0.00 0 6,923.90 0.00 9.80 0.00 0 6,923.90 0.00 10.40 0.00 0 6,923.90 0.00 11.00 0.00 0 6,923.90 0.00 11.60 0.00 0 6,923.90 0.00 12.20 0.00 0 6,923.90 0.00 12.80 0.04 1 6,923.92 0.04 13.40 0.17 2 6,923.96 0.17 14.00 0.26 3 6,923.98 0.26 14.60 0.28 3 6,923.99 0.28 15.20 0.27 3 6,923.98 0.27 15.80 0.26 3 6,923.98 0.26 16.40 0.24 2 6,923.98 0.24 17.00 0.22 2 6,923.97 0.22 17.60 0.21 2 6,923.97 0.21 18.20 0.20 2 6,923.97 0.20 18.80 0.19 2 6,923.97 0.19 19.40 0.18 2 6,923.96 0.18 20.00 0.17 2 6,923.96 0.17 20.60 0.16 2 6,923.96 0.16 21.20 0.15 2 6,923.96 0.15 21.80 0.15 2 6,923.96 0.15 22.40 0.14 2 6,923.96 0.14 23.00 0.14 2 6,923.95 0.14 23.60 0.14 2 6,923.95 0.14 24.20 0.14 2 6,923.95 0.14 24.80 0.13 2 6,923.95 0.13 25.40 0.08 1 6,923.94 0.08 26.00 0.04 1 6,923.92 0.04 26.60 0.02 0 6,923.91 0.02 27.20 0.01 0 6,923.91 0.01 27.80 0.00 0 6,923.90 0.00 28.40 0.00 0 6,923.90 0.00 29.00 0.00 0 6,923.90 0.00 29.60 0.00 0 6,923.90 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 153HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 16R: PRE-AREA-05-CULVERT Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,923.48 0.00 0.00 6,923.49 0.00 0.00 6,923.50 0.00 0.00 6,923.51 0.00 0.00 6,923.52 0.00 0.00 6,923.53 0.00 0.00 6,923.54 0.00 0.00 6,923.55 0.00 0.00 6,923.56 0.00 0.00 6,923.57 0.00 0.00 6,923.58 0.00 0.00 6,923.59 0.00 0.00 6,923.60 0.00 0.00 6,923.61 0.00 0.00 6,923.62 0.00 0.00 6,923.63 0.00 0.00 6,923.64 0.00 0.00 6,923.65 0.00 0.00 6,923.66 0.00 0.00 6,923.67 0.00 0.00 6,923.68 0.00 0.00 6,923.69 0.00 0.00 6,923.70 0.00 0.00 6,923.71 0.00 0.00 6,923.72 0.00 0.00 6,923.73 0.00 0.00 6,923.74 0.00 0.00 6,923.75 0.00 0.00 6,923.76 0.00 0.00 6,923.77 0.00 0.00 6,923.78 0.00 0.00 6,923.79 0.00 0.00 6,923.80 0.00 0.00 6,923.81 0.00 0.00 6,923.82 0.00 0.00 6,923.83 0.00 0.00 6,923.84 0.00 0.00 6,923.85 0.00 0.00 6,923.86 0.00 0.00 6,923.87 0.00 0.00 6,923.88 0.00 0.00 6,923.89 0.00 0.00 6,923.90 0.39 0.00 6,923.91 0.97 0.01 6,923.92 1.39 0.03 6,923.93 1.74 0.06 6,923.94 2.05 0.09 6,923.95 2.33 0.12 6,923.96 2.58 0.16 6,923.97 2.81 0.21 6,923.98 3.03 0.25 6,923.99 3.23 0.30 6,924.00 3.42 0.35 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,924.01 3.60 0.41 6,924.02 3.76 0.46 6,924.03 3.92 0.52 6,924.04 4.07 0.58 6,924.05 4.21 0.64 6,924.06 4.35 0.71 6,924.07 4.48 0.77 6,924.08 4.60 0.84 6,924.09 4.71 0.91 6,924.10 4.82 0.97 6,924.11 4.93 1.04 6,924.12 5.03 1.11 6,924.13 5.12 1.18 6,924.14 5.21 1.25 6,924.15 5.30 1.32 6,924.16 5.38 1.39 6,924.17 5.45 1.46 6,924.18 5.53 1.53 6,924.19 5.60 1.60 6,924.20 5.66 1.67 6,924.21 5.72 1.74 6,924.22 5.78 1.81 6,924.23 5.83 1.88 6,924.24 5.88 1.94 6,924.25 5.92 2.01 6,924.26 5.97 2.07 6,924.27 6.00 2.14 6,924.28 6.04 2.20 6,924.29 6.07 2.26 6,924.30 6.10 2.31 6,924.31 6.12 2.37 6,924.32 6.14 2.42 6,924.33 6.15 2.47 6,924.34 6.17 2.52 6,924.35 6.17 2.57 6,924.36 6.17 2.61 6,924.37 6.17 2.65 6,924.38 6.17 2.68 6,924.39 6.15 2.71 6,924.40 6.14 2.74 6,924.41 6.11 2.76 6,924.42 6.08 2.78 6,924.43 6.04 2.79 6,924.44 6.00 2.79 6,924.45 5.94 2.78 6,924.46 5.86 2.76 6,924.47 5.75 2.73 6,924.48 5.47 2.60 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 154HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 16R: PRE-AREA-05-CULVERT Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,923.48 0.0 0 6,923.49 0.0 0 6,923.50 0.0 0 6,923.51 0.0 0 6,923.52 0.0 0 6,923.53 0.0 0 6,923.54 0.0 0 6,923.55 0.0 0 6,923.56 0.0 0 6,923.57 0.0 0 6,923.58 0.0 0 6,923.59 0.0 0 6,923.60 0.0 0 6,923.61 0.0 0 6,923.62 0.0 0 6,923.63 0.0 0 6,923.64 0.0 0 6,923.65 0.0 0 6,923.66 0.0 0 6,923.67 0.0 0 6,923.68 0.0 0 6,923.69 0.0 0 6,923.70 0.0 0 6,923.71 0.0 0 6,923.72 0.0 0 6,923.73 0.0 0 6,923.74 0.0 0 6,923.75 0.0 0 6,923.76 0.0 0 6,923.77 0.0 0 6,923.78 0.0 0 6,923.79 0.0 0 6,923.80 0.0 0 6,923.81 0.0 0 6,923.82 0.0 0 6,923.83 0.0 0 6,923.84 0.0 0 6,923.85 0.0 0 6,923.86 0.0 0 6,923.87 0.0 0 6,923.88 0.0 0 6,923.89 0.0 0 6,923.90 0.0 0 6,923.91 0.0 0 6,923.92 0.0 1 6,923.93 0.0 1 6,923.94 0.0 1 6,923.95 0.1 2 6,923.96 0.1 2 6,923.97 0.1 2 6,923.98 0.1 2 6,923.99 0.1 3 6,924.00 0.1 3 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,924.01 0.1 3 6,924.02 0.1 4 6,924.03 0.1 4 6,924.04 0.1 4 6,924.05 0.2 5 6,924.06 0.2 5 6,924.07 0.2 5 6,924.08 0.2 5 6,924.09 0.2 6 6,924.10 0.2 6 6,924.11 0.2 6 6,924.12 0.2 7 6,924.13 0.2 7 6,924.14 0.2 7 6,924.15 0.2 7 6,924.16 0.3 8 6,924.17 0.3 8 6,924.18 0.3 8 6,924.19 0.3 9 6,924.20 0.3 9 6,924.21 0.3 9 6,924.22 0.3 9 6,924.23 0.3 10 6,924.24 0.3 10 6,924.25 0.3 10 6,924.26 0.3 10 6,924.27 0.4 11 6,924.28 0.4 11 6,924.29 0.4 11 6,924.30 0.4 11 6,924.31 0.4 12 6,924.32 0.4 12 6,924.33 0.4 12 6,924.34 0.4 12 6,924.35 0.4 12 6,924.36 0.4 13 6,924.37 0.4 13 6,924.38 0.4 13 6,924.39 0.4 13 6,924.40 0.4 13 6,924.41 0.5 14 6,924.42 0.5 14 6,924.43 0.5 14 6,924.44 0.5 14 6,924.45 0.5 14 6,924.46 0.5 14 6,924.47 0.5 14 6,924.48 0.5 14 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 155HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 17R: Reach-05A [61] Hint: Exceeded Reach 16R outlet invert by 0.03' @ 14.54 hrs Inflow Area = 27.686 ac, 0.00% Impervious, Inflow Depth = 0.09" for 100-YR event Inflow = 0.28 cfs @ 14.52 hrs, Volume= 0.199 af Outflow = 0.28 cfs @ 14.55 hrs, Volume= 0.199 af, Atten= 0%, Lag= 1.7 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 1.44 fps, Min. Travel Time= 2.0 min Avg. Velocity = 1.01 fps, Avg. Travel Time= 2.9 min Peak Storage= 34 cf @ 14.55 hrs Average Depth at Peak Storage= 0.03' , Surface Width= 7.41' Bank-Full Depth= 0.25' Flow Area= 4.1 sf, Capacity= 18.30 cfs 4.00' x 0.25' deep channel, n= 0.035 Earth, dense weeds Side Slope Z-value= 50.0 '/' Top Width= 29.00' Length= 173.7' Slope= 0.1471 '/' Inlet Invert= 6,922.88', Outlet Invert= 6,897.33' ‡ Reach 17R: Reach-05A Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=27.686 ac Avg. Flow Depth=0.03' Max Vel=1.44 fps n=0.035 L=173.7' S=0.1471 '/' Capacity=18.30 cfs 0.28 cfs0.28 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 156HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 17R: Reach-05A Primary Stage-Discharge Discharge (cfs) 181614121086420Depth (feet)0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Reach 17R: Reach-05A Storage Stage-Storage Storage (cubic-feet) 700650600550500450400350300250200150100500Depth (feet)0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 157HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 17R: Reach-05A Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,922.88 0.00 5.60 0.00 0 6,922.88 0.00 6.20 0.00 0 6,922.88 0.00 6.80 0.00 0 6,922.88 0.00 7.40 0.00 0 6,922.88 0.00 8.00 0.00 0 6,922.88 0.00 8.60 0.00 0 6,922.88 0.00 9.20 0.00 0 6,922.88 0.00 9.80 0.00 0 6,922.88 0.00 10.40 0.00 0 6,922.88 0.00 11.00 0.00 0 6,922.88 0.00 11.60 0.00 0 6,922.88 0.00 12.20 0.00 0 6,922.88 0.00 12.80 0.04 9 6,922.89 0.04 13.40 0.17 23 6,922.91 0.16 14.00 0.26 32 6,922.91 0.26 14.60 0.28 34 6,922.91 0.28 15.20 0.27 33 6,922.91 0.27 15.80 0.26 32 6,922.91 0.26 16.40 0.24 30 6,922.91 0.24 17.00 0.22 29 6,922.91 0.23 17.60 0.21 28 6,922.91 0.21 18.20 0.20 27 6,922.91 0.20 18.80 0.19 26 6,922.91 0.19 19.40 0.18 25 6,922.91 0.18 20.00 0.17 24 6,922.91 0.17 20.60 0.16 23 6,922.91 0.16 21.20 0.15 22 6,922.90 0.15 21.80 0.15 22 6,922.90 0.15 22.40 0.14 21 6,922.90 0.14 23.00 0.14 21 6,922.90 0.14 23.60 0.14 21 6,922.90 0.14 24.20 0.14 21 6,922.90 0.14 24.80 0.13 20 6,922.90 0.13 25.40 0.08 15 6,922.90 0.08 26.00 0.04 9 6,922.89 0.04 26.60 0.02 5 6,922.89 0.02 27.20 0.01 3 6,922.88 0.01 27.80 0.00 2 6,922.88 0.00 28.40 0.00 1 6,922.88 0.00 29.00 0.00 0 6,922.88 0.00 29.60 0.00 0 6,922.88 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 158HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 17R: Reach-05A Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,922.88 0.00 0.00 6,922.89 0.70 0.03 6,922.90 1.06 0.11 6,922.91 1.34 0.22 6,922.92 1.57 0.38 6,922.93 1.78 0.58 6,922.94 1.97 0.83 6,922.95 2.14 1.12 6,922.96 2.31 1.48 6,922.97 2.46 1.88 6,922.98 2.61 2.35 6,922.99 2.76 2.88 6,923.00 2.90 3.47 6,923.01 3.03 4.14 6,923.02 3.16 4.87 6,923.03 3.29 5.67 6,923.04 3.41 6.55 6,923.05 3.54 7.51 6,923.06 3.66 8.55 6,923.07 3.77 9.68 6,923.08 3.89 10.88 6,923.09 4.00 12.18 6,923.10 4.11 13.57 6,923.11 4.22 15.05 6,923.12 4.33 16.63 6,923.13 4.44 18.30 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 159HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 17R: Reach-05A Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,922.88 0.0 0 6,922.89 0.0 8 6,922.90 0.1 17 6,922.91 0.2 29 6,922.92 0.2 42 6,922.93 0.3 56 6,922.94 0.4 73 6,922.95 0.5 91 6,922.96 0.6 111 6,922.97 0.8 133 6,922.98 0.9 156 6,922.99 1.0 182 6,923.00 1.2 208 6,923.01 1.4 237 6,923.02 1.5 267 6,923.03 1.7 300 6,923.04 1.9 334 6,923.05 2.1 369 6,923.06 2.3 406 6,923.07 2.6 446 6,923.08 2.8 486 6,923.09 3.0 529 6,923.10 3.3 573 6,923.11 3.6 619 6,923.12 3.8 667 6,923.13 4.1 717 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 160HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 18R: Reach-05B [62] Hint: Exceeded Reach 17R OUTLET depth by 0.24' @ 14.45 hrs Inflow Area = 28.472 ac, 0.21% Impervious, Inflow Depth > 0.09" for 100-YR event Inflow = 0.31 cfs @ 14.50 hrs, Volume= 0.224 af Outflow = 0.31 cfs @ 14.51 hrs, Volume= 0.224 af, Atten= 0%, Lag= 0.5 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 1.39 fps, Min. Travel Time= 1.3 min Avg. Velocity = 1.04 fps, Avg. Travel Time= 1.7 min Peak Storage= 23 cf @ 14.51 hrs Average Depth at Peak Storage= 0.27' , Surface Width= 1.63' Bank-Full Depth= 1.00' Flow Area= 3.0 sf, Capacity= 9.97 cfs 0.00' x 1.00' deep channel, n= 0.035 Earth, dense weeds Side Slope Z-value= 3.0 '/' Top Width= 6.00' Length= 104.5' Slope= 0.0166 '/' Inlet Invert= 6,897.33', Outlet Invert= 6,895.60' Reach 18R: Reach-05B Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=28.472 ac Avg. Flow Depth=0.27' Max Vel=1.39 fps n=0.035 L=104.5' S=0.0166 '/' Capacity=9.97 cfs 0.31 cfs0.31 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 161HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 18R: Reach-05B Primary Stage-Discharge Discharge (cfs) 9876543210Depth (feet)1 0 Reach 18R: Reach-05B Storage Stage-Storage Storage (cubic-feet) 300280260240220200180160140120100806040200Depth (feet)1 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 162HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 18R: Reach-05B Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,897.33 0.00 5.60 0.00 0 6,897.33 0.00 6.20 0.00 0 6,897.33 0.00 6.80 0.00 0 6,897.33 0.00 7.40 0.00 0 6,897.33 0.00 8.00 0.00 0 6,897.33 0.00 8.60 0.00 0 6,897.33 0.00 9.20 0.00 0 6,897.33 0.00 9.80 0.00 0 6,897.33 0.00 10.40 0.00 0 6,897.33 0.00 11.00 0.00 0 6,897.33 0.00 11.60 0.00 0 6,897.33 0.00 12.20 0.06 6 6,897.47 0.05 12.80 0.15 13 6,897.54 0.15 13.40 0.22 18 6,897.57 0.21 14.00 0.29 22 6,897.60 0.29 14.60 0.31 23 6,897.60 0.31 15.20 0.29 22 6,897.60 0.29 15.80 0.28 21 6,897.59 0.28 16.40 0.26 20 6,897.58 0.26 17.00 0.24 19 6,897.58 0.24 17.60 0.23 18 6,897.57 0.23 18.20 0.22 18 6,897.57 0.22 18.80 0.21 17 6,897.56 0.21 19.40 0.20 16 6,897.56 0.20 20.00 0.19 16 6,897.55 0.19 20.60 0.17 15 6,897.55 0.17 21.20 0.16 14 6,897.54 0.16 21.80 0.16 14 6,897.54 0.16 22.40 0.15 14 6,897.54 0.15 23.00 0.15 14 6,897.54 0.15 23.60 0.15 13 6,897.54 0.15 24.20 0.15 13 6,897.54 0.15 24.80 0.13 12 6,897.53 0.13 25.40 0.08 9 6,897.50 0.08 26.00 0.04 5 6,897.46 0.04 26.60 0.02 3 6,897.42 0.02 27.20 0.01 2 6,897.40 0.01 27.80 0.00 1 6,897.38 0.00 28.40 0.00 0 6,897.37 0.00 29.00 0.00 0 6,897.36 0.00 29.60 0.00 0 6,897.35 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 163HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 18R: Reach-05B Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,897.33 0.00 0.00 6,897.34 0.15 0.00 6,897.35 0.24 0.00 6,897.36 0.32 0.00 6,897.37 0.39 0.00 6,897.38 0.45 0.00 6,897.39 0.51 0.01 6,897.40 0.56 0.01 6,897.41 0.62 0.01 6,897.42 0.67 0.02 6,897.43 0.72 0.02 6,897.44 0.76 0.03 6,897.45 0.81 0.03 6,897.46 0.85 0.04 6,897.47 0.90 0.05 6,897.48 0.94 0.06 6,897.49 0.98 0.08 6,897.50 1.02 0.09 6,897.51 1.06 0.10 6,897.52 1.10 0.12 6,897.53 1.14 0.14 6,897.54 1.17 0.16 6,897.55 1.21 0.18 6,897.56 1.25 0.20 6,897.57 1.28 0.22 6,897.58 1.32 0.25 6,897.59 1.35 0.27 6,897.60 1.39 0.30 6,897.61 1.42 0.33 6,897.62 1.46 0.37 6,897.63 1.49 0.40 6,897.64 1.52 0.44 6,897.65 1.55 0.48 6,897.66 1.59 0.52 6,897.67 1.62 0.56 6,897.68 1.65 0.61 6,897.69 1.68 0.65 6,897.70 1.71 0.70 6,897.71 1.74 0.76 6,897.72 1.77 0.81 6,897.73 1.80 0.87 6,897.74 1.83 0.92 6,897.75 1.86 0.99 6,897.76 1.89 1.05 6,897.77 1.92 1.12 6,897.78 1.95 1.19 6,897.79 1.98 1.26 6,897.80 2.01 1.33 6,897.81 2.04 1.41 6,897.82 2.07 1.49 6,897.83 2.09 1.57 6,897.84 2.12 1.65 6,897.85 2.15 1.74 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,897.86 2.18 1.83 6,897.87 2.20 1.93 6,897.88 2.23 2.02 6,897.89 2.26 2.12 6,897.90 2.28 2.23 6,897.91 2.31 2.33 6,897.92 2.34 2.44 6,897.93 2.36 2.55 6,897.94 2.39 2.67 6,897.95 2.42 2.79 6,897.96 2.44 2.91 6,897.97 2.47 3.03 6,897.98 2.49 3.16 6,897.99 2.52 3.29 6,898.00 2.54 3.43 6,898.01 2.57 3.56 6,898.02 2.59 3.71 6,898.03 2.62 3.85 6,898.04 2.64 4.00 6,898.05 2.67 4.15 6,898.06 2.69 4.31 6,898.07 2.72 4.47 6,898.08 2.74 4.63 6,898.09 2.77 4.79 6,898.10 2.79 4.96 6,898.11 2.82 5.14 6,898.12 2.84 5.32 6,898.13 2.86 5.50 6,898.14 2.89 5.68 6,898.15 2.91 5.87 6,898.16 2.93 6.06 6,898.17 2.96 6.26 6,898.18 2.98 6.46 6,898.19 3.00 6.67 6,898.20 3.03 6.88 6,898.21 3.05 7.09 6,898.22 3.07 7.31 6,898.23 3.10 7.53 6,898.24 3.12 7.75 6,898.25 3.14 7.98 6,898.26 3.17 8.21 6,898.27 3.19 8.45 6,898.28 3.21 8.69 6,898.29 3.23 8.94 6,898.30 3.26 9.19 6,898.31 3.28 9.44 6,898.32 3.30 9.70 6,898.33 3.32 9.97 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 164HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 18R: Reach-05B Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,897.33 0.0 0 6,897.34 0.0 0 6,897.35 0.0 0 6,897.36 0.0 0 6,897.37 0.0 1 6,897.38 0.0 1 6,897.39 0.0 1 6,897.40 0.0 2 6,897.41 0.0 2 6,897.42 0.0 3 6,897.43 0.0 3 6,897.44 0.0 4 6,897.45 0.0 5 6,897.46 0.1 5 6,897.47 0.1 6 6,897.48 0.1 7 6,897.49 0.1 8 6,897.50 0.1 9 6,897.51 0.1 10 6,897.52 0.1 11 6,897.53 0.1 13 6,897.54 0.1 14 6,897.55 0.1 15 6,897.56 0.2 17 6,897.57 0.2 18 6,897.58 0.2 20 6,897.59 0.2 21 6,897.60 0.2 23 6,897.61 0.2 25 6,897.62 0.3 26 6,897.63 0.3 28 6,897.64 0.3 30 6,897.65 0.3 32 6,897.66 0.3 34 6,897.67 0.3 36 6,897.68 0.4 38 6,897.69 0.4 41 6,897.70 0.4 43 6,897.71 0.4 45 6,897.72 0.5 48 6,897.73 0.5 50 6,897.74 0.5 53 6,897.75 0.5 55 6,897.76 0.6 58 6,897.77 0.6 61 6,897.78 0.6 63 6,897.79 0.6 66 6,897.80 0.7 69 6,897.81 0.7 72 6,897.82 0.7 75 6,897.83 0.8 78 6,897.84 0.8 82 6,897.85 0.8 85 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,897.86 0.8 88 6,897.87 0.9 91 6,897.88 0.9 95 6,897.89 0.9 98 6,897.90 1.0 102 6,897.91 1.0 105 6,897.92 1.0 109 6,897.93 1.1 113 6,897.94 1.1 117 6,897.95 1.2 121 6,897.96 1.2 124 6,897.97 1.2 128 6,897.98 1.3 132 6,897.99 1.3 137 6,898.00 1.3 141 6,898.01 1.4 145 6,898.02 1.4 149 6,898.03 1.5 154 6,898.04 1.5 158 6,898.05 1.6 163 6,898.06 1.6 167 6,898.07 1.6 172 6,898.08 1.7 176 6,898.09 1.7 181 6,898.10 1.8 186 6,898.11 1.8 191 6,898.12 1.9 196 6,898.13 1.9 201 6,898.14 2.0 206 6,898.15 2.0 211 6,898.16 2.1 216 6,898.17 2.1 221 6,898.18 2.2 227 6,898.19 2.2 232 6,898.20 2.3 237 6,898.21 2.3 243 6,898.22 2.4 248 6,898.23 2.4 254 6,898.24 2.5 260 6,898.25 2.5 265 6,898.26 2.6 271 6,898.27 2.7 277 6,898.28 2.7 283 6,898.29 2.8 289 6,898.30 2.8 295 6,898.31 2.9 301 6,898.32 2.9 307 6,898.33 3.0 314 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 165HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 19R: Reach-05C [62] Hint: Exceeded Reach 15R OUTLET depth by 0.35' @ 14.18 hrs [62] Hint: Exceeded Reach 18R OUTLET depth by 0.15' @ 12.92 hrs Inflow Area = 105.736 ac, 0.14% Impervious, Inflow Depth = 0.10" for 100-YR event Inflow = 1.22 cfs @ 14.14 hrs, Volume= 0.849 af Outflow = 1.22 cfs @ 14.14 hrs, Volume= 0.849 af, Atten= 0%, Lag= 0.3 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 2.49 fps, Min. Travel Time= 1.0 min Avg. Velocity = 1.82 fps, Avg. Travel Time= 1.4 min Peak Storage= 73 cf @ 14.14 hrs Average Depth at Peak Storage= 0.40' , Surface Width= 2.42' Bank-Full Depth= 1.00' Flow Area= 3.0 sf, Capacity= 13.65 cfs 0.00' x 1.00' deep channel, n= 0.035 Earth, dense weeds Side Slope Z-value= 3.0 '/' Top Width= 6.00' Length= 148.2' Slope= 0.0310 '/' Inlet Invert= 6,895.60', Outlet Invert= 6,891.00' Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 166HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 19R: Reach-05C Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Inflow Area=105.736 ac Avg. Flow Depth=0.40' Max Vel=2.49 fps n=0.035 L=148.2' S=0.0310 '/' Capacity=13.65 cfs 1.22 cfs1.22 cfs Reach 19R: Reach-05C Primary Stage-Discharge Discharge (cfs) 131211109876543210Depth (feet)1 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 167HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 19R: Reach-05C Storage Stage-Storage Storage (cubic-feet) 400350300250200150100500Depth (feet)1 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 168HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 19R: Reach-05C Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,895.60 0.00 5.60 0.00 0 6,895.60 0.00 6.20 0.00 0 6,895.60 0.00 6.80 0.00 0 6,895.60 0.00 7.40 0.00 0 6,895.60 0.00 8.00 0.00 0 6,895.60 0.00 8.60 0.00 0 6,895.60 0.00 9.20 0.00 0 6,895.60 0.00 9.80 0.00 0 6,895.60 0.00 10.40 0.00 0 6,895.60 0.00 11.00 0.00 0 6,895.60 0.00 11.60 0.00 0 6,895.60 0.00 12.20 0.20 17 6,895.79 0.17 12.80 0.86 56 6,895.95 0.86 13.40 1.04 64 6,895.98 1.04 14.00 1.21 72 6,896.00 1.21 14.60 1.18 71 6,896.00 1.19 15.20 1.10 67 6,895.99 1.10 15.80 1.02 64 6,895.98 1.02 16.40 0.94 60 6,895.97 0.94 17.00 0.87 57 6,895.96 0.87 17.60 0.82 54 6,895.95 0.82 18.20 0.78 52 6,895.94 0.78 18.80 0.74 50 6,895.94 0.75 19.40 0.71 49 6,895.93 0.71 20.00 0.67 47 6,895.92 0.67 20.60 0.63 44 6,895.92 0.63 21.20 0.59 42 6,895.91 0.59 21.80 0.57 41 6,895.90 0.57 22.40 0.56 40 6,895.90 0.56 23.00 0.55 40 6,895.90 0.55 23.60 0.55 40 6,895.90 0.55 24.20 0.54 40 6,895.90 0.54 24.80 0.47 36 6,895.88 0.47 25.40 0.28 25 6,895.84 0.29 26.00 0.12 13 6,895.77 0.13 26.60 0.05 7 6,895.73 0.06 27.20 0.02 4 6,895.69 0.02 27.80 0.01 2 6,895.67 0.01 28.40 0.00 1 6,895.65 0.00 29.00 0.00 1 6,895.63 0.00 29.60 0.00 0 6,895.62 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 169HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 19R: Reach-05C Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,895.60 0.00 0.00 6,895.61 0.21 0.00 6,895.62 0.34 0.00 6,895.63 0.44 0.00 6,895.64 0.53 0.00 6,895.65 0.62 0.00 6,895.66 0.70 0.01 6,895.67 0.77 0.01 6,895.68 0.84 0.02 6,895.69 0.91 0.02 6,895.70 0.98 0.03 6,895.71 1.04 0.04 6,895.72 1.11 0.05 6,895.73 1.17 0.06 6,895.74 1.23 0.07 6,895.75 1.28 0.09 6,895.76 1.34 0.10 6,895.77 1.40 0.12 6,895.78 1.45 0.14 6,895.79 1.50 0.16 6,895.80 1.56 0.19 6,895.81 1.61 0.21 6,895.82 1.66 0.24 6,895.83 1.71 0.27 6,895.84 1.76 0.30 6,895.85 1.81 0.34 6,895.86 1.85 0.38 6,895.87 1.90 0.42 6,895.88 1.95 0.46 6,895.89 1.99 0.50 6,895.90 2.04 0.55 6,895.91 2.08 0.60 6,895.92 2.13 0.65 6,895.93 2.17 0.71 6,895.94 2.22 0.77 6,895.95 2.26 0.83 6,895.96 2.30 0.90 6,895.97 2.34 0.96 6,895.98 2.39 1.03 6,895.99 2.43 1.11 6,896.00 2.47 1.19 6,896.01 2.51 1.27 6,896.02 2.55 1.35 6,896.03 2.59 1.44 6,896.04 2.63 1.53 6,896.05 2.67 1.62 6,896.06 2.71 1.72 6,896.07 2.75 1.82 6,896.08 2.79 1.93 6,896.09 2.83 2.04 6,896.10 2.87 2.15 6,896.11 2.90 2.27 6,896.12 2.94 2.39 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,896.13 2.98 2.51 6,896.14 3.02 2.64 6,896.15 3.05 2.77 6,896.16 3.09 2.91 6,896.17 3.13 3.05 6,896.18 3.16 3.19 6,896.19 3.20 3.34 6,896.20 3.24 3.50 6,896.21 3.27 3.65 6,896.22 3.31 3.81 6,896.23 3.34 3.98 6,896.24 3.38 4.15 6,896.25 3.41 4.33 6,896.26 3.45 4.51 6,896.27 3.48 4.69 6,896.28 3.52 4.88 6,896.29 3.55 5.07 6,896.30 3.59 5.27 6,896.31 3.62 5.48 6,896.32 3.65 5.68 6,896.33 3.69 5.90 6,896.34 3.72 6.11 6,896.35 3.76 6.34 6,896.36 3.79 6.57 6,896.37 3.82 6.80 6,896.38 3.86 7.04 6,896.39 3.89 7.28 6,896.40 3.92 7.53 6,896.41 3.95 7.78 6,896.42 3.99 8.04 6,896.43 4.02 8.30 6,896.44 4.05 8.57 6,896.45 4.08 8.85 6,896.46 4.11 9.13 6,896.47 4.15 9.41 6,896.48 4.18 9.71 6,896.49 4.21 10.00 6,896.50 4.24 10.31 6,896.51 4.27 10.61 6,896.52 4.30 10.93 6,896.53 4.33 11.25 6,896.54 4.37 11.57 6,896.55 4.40 11.90 6,896.56 4.43 12.24 6,896.57 4.46 12.58 6,896.58 4.49 12.93 6,896.59 4.52 13.29 6,896.60 4.55 13.65 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 170HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 19R: Reach-05C Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,895.60 0.0 0 6,895.61 0.0 0 6,895.62 0.0 0 6,895.63 0.0 0 6,895.64 0.0 1 6,895.65 0.0 1 6,895.66 0.0 2 6,895.67 0.0 2 6,895.68 0.0 3 6,895.69 0.0 4 6,895.70 0.0 4 6,895.71 0.0 5 6,895.72 0.0 6 6,895.73 0.1 8 6,895.74 0.1 9 6,895.75 0.1 10 6,895.76 0.1 11 6,895.77 0.1 13 6,895.78 0.1 14 6,895.79 0.1 16 6,895.80 0.1 18 6,895.81 0.1 20 6,895.82 0.1 22 6,895.83 0.2 24 6,895.84 0.2 26 6,895.85 0.2 28 6,895.86 0.2 30 6,895.87 0.2 32 6,895.88 0.2 35 6,895.89 0.3 37 6,895.90 0.3 40 6,895.91 0.3 43 6,895.92 0.3 46 6,895.93 0.3 48 6,895.94 0.3 51 6,895.95 0.4 54 6,895.96 0.4 58 6,895.97 0.4 61 6,895.98 0.4 64 6,895.99 0.5 68 6,896.00 0.5 71 6,896.01 0.5 75 6,896.02 0.5 78 6,896.03 0.6 82 6,896.04 0.6 86 6,896.05 0.6 90 6,896.06 0.6 94 6,896.07 0.7 98 6,896.08 0.7 102 6,896.09 0.7 107 6,896.10 0.8 111 6,896.11 0.8 116 6,896.12 0.8 120 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,896.13 0.8 125 6,896.14 0.9 130 6,896.15 0.9 134 6,896.16 0.9 139 6,896.17 1.0 144 6,896.18 1.0 150 6,896.19 1.0 155 6,896.20 1.1 160 6,896.21 1.1 165 6,896.22 1.2 171 6,896.23 1.2 176 6,896.24 1.2 182 6,896.25 1.3 188 6,896.26 1.3 194 6,896.27 1.3 200 6,896.28 1.4 206 6,896.29 1.4 212 6,896.30 1.5 218 6,896.31 1.5 224 6,896.32 1.6 230 6,896.33 1.6 237 6,896.34 1.6 243 6,896.35 1.7 250 6,896.36 1.7 257 6,896.37 1.8 264 6,896.38 1.8 270 6,896.39 1.9 277 6,896.40 1.9 285 6,896.41 2.0 292 6,896.42 2.0 299 6,896.43 2.1 306 6,896.44 2.1 314 6,896.45 2.2 321 6,896.46 2.2 329 6,896.47 2.3 337 6,896.48 2.3 344 6,896.49 2.4 352 6,896.50 2.4 360 6,896.51 2.5 368 6,896.52 2.5 376 6,896.53 2.6 385 6,896.54 2.7 393 6,896.55 2.7 401 6,896.56 2.8 410 6,896.57 2.8 418 6,896.58 2.9 427 6,896.59 2.9 436 6,896.60 3.0 445 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 171HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 20R: Reach-05D [61] Hint: Exceeded Reach 19R outlet invert by 0.36' @ 14.15 hrs Inflow Area = 105.736 ac, 0.14% Impervious, Inflow Depth > 0.10" for 100-YR event Inflow = 1.22 cfs @ 14.14 hrs, Volume= 0.849 af Outflow = 1.22 cfs @ 14.14 hrs, Volume= 0.849 af, Atten= 0%, Lag= 0.1 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 4.74 fps, Min. Travel Time= 0.3 min Avg. Velocity = 3.54 fps, Avg. Travel Time= 0.4 min Peak Storage= 23 cf @ 14.14 hrs Average Depth at Peak Storage= 0.36' , Surface Width= 1.43' Bank-Full Depth= 5.00' Flow Area= 50.0 sf, Capacity= 1,368.86 cfs 0.00' x 5.00' deep channel, n= 0.035 Earth, dense weeds Side Slope Z-value= 2.0 '/' Top Width= 20.00' Length= 89.1' Slope= 0.1422 '/' Inlet Invert= 6,891.00', Outlet Invert= 6,878.33' Reach 20R: Reach-05D Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Inflow Area=105.736 ac Avg. Flow Depth=0.36' Max Vel=4.74 fps n=0.035 L=89.1' S=0.1422 '/' Capacity=1,368.86 cfs 1.22 cfs1.22 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 172HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 20R: Reach-05D Primary Stage-Discharge Discharge (cfs) 1,2001,0008006004002000Depth (feet)5 4 3 2 1 0 Reach 20R: Reach-05D Storage Stage-Storage Storage (cubic-feet) 4,0003,5003,0002,5002,0001,5001,0005000Depth (feet)5 4 3 2 1 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 173HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 20R: Reach-05D Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,891.00 0.00 5.60 0.00 0 6,891.00 0.00 6.20 0.00 0 6,891.00 0.00 6.80 0.00 0 6,891.00 0.00 7.40 0.00 0 6,891.00 0.00 8.00 0.00 0 6,891.00 0.00 8.60 0.00 0 6,891.00 0.00 9.20 0.00 0 6,891.00 0.00 9.80 0.00 0 6,891.00 0.00 10.40 0.00 0 6,891.00 0.00 11.00 0.00 0 6,891.00 0.00 11.60 0.00 0 6,891.00 0.00 12.20 0.17 5 6,891.17 0.17 12.80 0.86 18 6,891.31 0.86 13.40 1.04 20 6,891.34 1.04 14.00 1.21 23 6,891.36 1.21 14.60 1.19 22 6,891.35 1.19 15.20 1.10 21 6,891.34 1.10 15.80 1.02 20 6,891.33 1.02 16.40 0.94 19 6,891.32 0.94 17.00 0.87 18 6,891.32 0.87 17.60 0.82 17 6,891.31 0.82 18.20 0.78 16 6,891.30 0.78 18.80 0.75 16 6,891.30 0.75 19.40 0.71 15 6,891.29 0.71 20.00 0.67 15 6,891.29 0.67 20.60 0.63 14 6,891.28 0.63 21.20 0.59 13 6,891.27 0.59 21.80 0.57 13 6,891.27 0.57 22.40 0.56 13 6,891.27 0.56 23.00 0.55 13 6,891.27 0.55 23.60 0.55 13 6,891.26 0.55 24.20 0.54 12 6,891.26 0.54 24.80 0.47 11 6,891.25 0.47 25.40 0.29 8 6,891.21 0.29 26.00 0.13 4 6,891.15 0.13 26.60 0.06 2 6,891.11 0.06 27.20 0.02 1 6,891.08 0.02 27.80 0.01 1 6,891.06 0.01 28.40 0.00 0 6,891.04 0.00 29.00 0.00 0 6,891.01 0.00 29.60 0.00 0 6,891.00 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 174HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 20R: Reach-05D Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,891.00 0.00 0.00 6,891.05 1.27 0.01 6,891.10 2.02 0.04 6,891.15 2.64 0.12 6,891.20 3.20 0.26 6,891.25 3.72 0.46 6,891.30 4.20 0.76 6,891.35 4.65 1.14 6,891.40 5.08 1.63 6,891.45 5.50 2.23 6,891.50 5.90 2.95 6,891.55 6.29 3.80 6,891.60 6.66 4.80 6,891.65 7.03 5.94 6,891.70 7.38 7.23 6,891.75 7.73 8.70 6,891.80 8.07 10.33 6,891.85 8.40 12.14 6,891.90 8.73 14.14 6,891.95 9.05 16.33 6,892.00 9.36 18.73 6,892.05 9.67 21.33 6,892.10 9.98 24.14 6,892.15 10.28 27.18 6,892.20 10.57 30.45 6,892.25 10.86 33.95 6,892.30 11.15 37.70 6,892.35 11.44 41.69 6,892.40 11.72 45.93 6,892.45 11.99 50.44 6,892.50 12.27 55.21 6,892.55 12.54 60.25 6,892.60 12.81 65.58 6,892.65 13.07 71.19 6,892.70 13.34 77.09 6,892.75 13.60 83.28 6,892.80 13.85 89.78 6,892.85 14.11 96.58 6,892.90 14.36 103.70 6,892.95 14.61 111.14 6,893.00 14.86 118.90 6,893.05 15.11 126.99 6,893.10 15.35 135.42 6,893.15 15.60 144.19 6,893.20 15.84 153.31 6,893.25 16.08 162.78 6,893.30 16.31 172.60 6,893.35 16.55 182.79 6,893.40 16.78 193.35 6,893.45 17.02 204.28 6,893.50 17.25 215.58 6,893.55 17.48 227.27 6,893.60 17.70 239.35 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,893.65 17.93 251.82 6,893.70 18.15 264.69 6,893.75 18.38 277.97 6,893.80 18.60 291.65 6,893.85 18.82 305.75 6,893.90 19.04 320.26 6,893.95 19.26 335.20 6,894.00 19.48 350.56 6,894.05 19.69 366.36 6,894.10 19.91 382.59 6,894.15 20.12 399.27 6,894.20 20.33 416.40 6,894.25 20.54 433.97 6,894.30 20.75 452.01 6,894.35 20.96 470.50 6,894.40 21.17 489.46 6,894.45 21.38 508.89 6,894.50 21.58 528.80 6,894.55 21.79 549.18 6,894.60 21.99 570.05 6,894.65 22.20 591.41 6,894.70 22.40 613.26 6,894.75 22.60 635.61 6,894.80 22.80 658.46 6,894.85 23.00 681.82 6,894.90 23.20 705.69 6,894.95 23.40 730.07 6,895.00 23.59 754.98 6,895.05 23.79 780.41 6,895.10 23.98 806.36 6,895.15 24.18 832.85 6,895.20 24.37 859.88 6,895.25 24.57 887.45 6,895.30 24.76 915.57 6,895.35 24.95 944.23 6,895.40 25.14 973.45 6,895.45 25.33 1,003.23 6,895.50 25.52 1,033.57 6,895.55 25.71 1,064.48 6,895.60 25.90 1,095.96 6,895.65 26.08 1,128.01 6,895.70 26.27 1,160.65 6,895.75 26.46 1,193.87 6,895.80 26.64 1,227.68 6,895.85 26.83 1,262.07 6,895.90 27.01 1,297.07 6,895.95 27.19 1,332.66 6,896.00 27.38 1,368.86 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 175HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 20R: Reach-05D Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,891.00 0.0 0 6,891.05 0.0 0 6,891.10 0.0 2 6,891.15 0.0 4 6,891.20 0.1 7 6,891.25 0.1 11 6,891.30 0.2 16 6,891.35 0.2 22 6,891.40 0.3 29 6,891.45 0.4 36 6,891.50 0.5 45 6,891.55 0.6 54 6,891.60 0.7 64 6,891.65 0.8 75 6,891.70 1.0 87 6,891.75 1.1 100 6,891.80 1.3 114 6,891.85 1.4 129 6,891.90 1.6 144 6,891.95 1.8 161 6,892.00 2.0 178 6,892.05 2.2 196 6,892.10 2.4 216 6,892.15 2.6 236 6,892.20 2.9 257 6,892.25 3.1 278 6,892.30 3.4 301 6,892.35 3.6 325 6,892.40 3.9 349 6,892.45 4.2 375 6,892.50 4.5 401 6,892.55 4.8 428 6,892.60 5.1 456 6,892.65 5.4 485 6,892.70 5.8 515 6,892.75 6.1 546 6,892.80 6.5 577 6,892.85 6.8 610 6,892.90 7.2 643 6,892.95 7.6 678 6,893.00 8.0 713 6,893.05 8.4 749 6,893.10 8.8 786 6,893.15 9.2 824 6,893.20 9.7 862 6,893.25 10.1 902 6,893.30 10.6 943 6,893.35 11.0 984 6,893.40 11.5 1,026 6,893.45 12.0 1,070 6,893.50 12.5 1,114 6,893.55 13.0 1,159 6,893.60 13.5 1,205 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,893.65 14.0 1,251 6,893.70 14.6 1,299 6,893.75 15.1 1,348 6,893.80 15.7 1,397 6,893.85 16.2 1,447 6,893.90 16.8 1,499 6,893.95 17.4 1,551 6,894.00 18.0 1,604 6,894.05 18.6 1,658 6,894.10 19.2 1,713 6,894.15 19.8 1,768 6,894.20 20.5 1,825 6,894.25 21.1 1,882 6,894.30 21.8 1,941 6,894.35 22.4 2,000 6,894.40 23.1 2,060 6,894.45 23.8 2,121 6,894.50 24.5 2,183 6,894.55 25.2 2,246 6,894.60 25.9 2,309 6,894.65 26.6 2,374 6,894.70 27.4 2,440 6,894.75 28.1 2,506 6,894.80 28.9 2,573 6,894.85 29.6 2,641 6,894.90 30.4 2,710 6,894.95 31.2 2,780 6,895.00 32.0 2,851 6,895.05 32.8 2,923 6,895.10 33.6 2,996 6,895.15 34.4 3,069 6,895.20 35.3 3,143 6,895.25 36.1 3,219 6,895.30 37.0 3,295 6,895.35 37.8 3,372 6,895.40 38.7 3,450 6,895.45 39.6 3,529 6,895.50 40.5 3,609 6,895.55 41.4 3,689 6,895.60 42.3 3,771 6,895.65 43.2 3,853 6,895.70 44.2 3,936 6,895.75 45.1 4,021 6,895.80 46.1 4,106 6,895.85 47.0 4,192 6,895.90 48.0 4,279 6,895.95 49.0 4,366 6,896.00 50.0 4,455 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 176HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 21R: Reach-05E [62] Hint: Exceeded Reach 14R OUTLET depth by 0.38' @ 14.09 hrs [62] Hint: Exceeded Reach 20R OUTLET depth by 0.18' @ 12.20 hrs Inflow Area = 114.071 ac, 0.29% Impervious, Inflow Depth > 0.11" for 100-YR event Inflow = 1.44 cfs @ 14.07 hrs, Volume= 1.044 af Outflow = 1.44 cfs @ 14.08 hrs, Volume= 1.044 af, Atten= 0%, Lag= 0.6 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 4.70 fps, Min. Travel Time= 0.8 min Avg. Velocity = 3.49 fps, Avg. Travel Time= 1.1 min Peak Storage= 69 cf @ 14.08 hrs Average Depth at Peak Storage= 0.39' , Surface Width= 1.57' Bank-Full Depth= 3.00' Flow Area= 18.0 sf, Capacity= 328.40 cfs 0.00' x 3.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 2.0 '/' Top Width= 12.00' Length= 224.8' Slope= 0.0917 '/' Inlet Invert= 6,878.33', Outlet Invert= 6,857.72' Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 177HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 21R: Reach-05E Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Inflow Area=114.071 ac Avg. Flow Depth=0.39' Max Vel=4.70 fps n=0.030 L=224.8' S=0.0917 '/' Capacity=328.40 cfs 1.44 cfs1.44 cfs Reach 21R: Reach-05E Primary Stage-Discharge Discharge (cfs) 300250200150100500Depth (feet)3 2 1 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 178HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 21R: Reach-05E Storage Stage-Storage Storage (cubic-feet) 4,0003,5003,0002,5002,0001,5001,0005000Depth (feet)3 2 1 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 179HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 21R: Reach-05E Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,878.33 0.00 5.60 0.00 0 6,878.33 0.00 6.20 0.00 0 6,878.33 0.00 6.80 0.00 0 6,878.33 0.00 7.40 0.00 0 6,878.33 0.00 8.00 0.00 0 6,878.33 0.00 8.60 0.00 0 6,878.33 0.00 9.20 0.00 0 6,878.33 0.00 9.80 0.00 0 6,878.33 0.00 10.40 0.00 0 6,878.33 0.00 11.00 0.00 0 6,878.33 0.00 11.60 0.00 0 6,878.33 0.00 12.20 1.12 56 6,878.68 1.08 12.80 1.25 62 6,878.70 1.25 13.40 1.31 64 6,878.71 1.30 14.00 1.44 69 6,878.72 1.44 14.60 1.39 67 6,878.72 1.40 15.20 1.30 64 6,878.71 1.30 15.80 1.21 60 6,878.70 1.21 16.40 1.12 57 6,878.69 1.12 17.00 1.04 54 6,878.68 1.04 17.60 0.97 51 6,878.67 0.97 18.20 0.92 49 6,878.66 0.93 18.80 0.88 48 6,878.66 0.88 19.40 0.84 46 6,878.65 0.84 20.00 0.79 44 6,878.64 0.79 20.60 0.74 42 6,878.63 0.74 21.20 0.70 40 6,878.63 0.70 21.80 0.67 39 6,878.62 0.67 22.40 0.66 38 6,878.62 0.66 23.00 0.65 38 6,878.62 0.65 23.60 0.64 38 6,878.62 0.64 24.20 0.63 37 6,878.62 0.63 24.80 0.51 32 6,878.60 0.51 25.40 0.30 21 6,878.55 0.30 26.00 0.13 12 6,878.49 0.13 26.60 0.06 6 6,878.45 0.06 27.20 0.02 3 6,878.41 0.03 27.80 0.01 2 6,878.39 0.01 28.40 0.00 1 6,878.37 0.00 29.00 0.00 0 6,878.36 0.00 29.60 0.00 0 6,878.34 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 180HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 21R: Reach-05E Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,878.33 0.00 0.00 6,878.35 0.56 0.00 6,878.37 1.01 0.00 6,878.39 1.34 0.01 6,878.41 1.62 0.02 6,878.43 1.89 0.04 6,878.45 2.13 0.06 6,878.47 2.36 0.09 6,878.49 2.58 0.13 6,878.51 2.80 0.18 6,878.53 3.00 0.24 6,878.55 3.19 0.31 6,878.57 3.39 0.39 6,878.59 3.57 0.49 6,878.61 3.75 0.59 6,878.63 3.93 0.71 6,878.65 4.10 0.84 6,878.67 4.27 0.99 6,878.69 4.44 1.15 6,878.71 4.60 1.33 6,878.73 4.76 1.53 6,878.75 4.92 1.74 6,878.77 5.07 1.97 6,878.79 5.23 2.22 6,878.81 5.38 2.48 6,878.83 5.52 2.77 6,878.85 5.67 3.07 6,878.87 5.82 3.39 6,878.89 5.96 3.74 6,878.91 6.10 4.11 6,878.93 6.24 4.49 6,878.95 6.38 4.91 6,878.97 6.51 5.34 6,878.99 6.65 5.79 6,879.01 6.78 6.28 6,879.03 6.91 6.78 6,879.05 7.05 7.31 6,879.07 7.18 7.87 6,879.09 7.30 8.44 6,879.11 7.43 9.04 6,879.13 7.56 9.68 6,879.15 7.68 10.34 6,879.17 7.81 11.02 6,879.19 7.93 11.74 6,879.21 8.05 12.48 6,879.23 8.18 13.25 6,879.25 8.30 14.05 6,879.27 8.42 14.88 6,879.29 8.54 15.73 6,879.31 8.65 16.63 6,879.33 8.77 17.55 6,879.35 8.89 18.49 6,879.37 9.00 19.48 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,879.39 9.12 20.50 6,879.41 9.23 21.54 6,879.43 9.35 22.63 6,879.45 9.46 23.74 6,879.47 9.57 24.88 6,879.49 9.68 26.07 6,879.51 9.79 27.28 6,879.53 9.90 28.53 6,879.55 10.01 29.82 6,879.57 10.12 31.14 6,879.59 10.23 32.49 6,879.61 10.34 33.89 6,879.63 10.45 35.32 6,879.65 10.55 36.78 6,879.67 10.66 38.29 6,879.69 10.77 39.84 6,879.71 10.87 41.41 6,879.73 10.98 43.04 6,879.75 11.08 44.70 6,879.77 11.18 46.39 6,879.79 11.29 48.13 6,879.81 11.39 49.91 6,879.83 11.49 51.72 6,879.85 11.60 53.59 6,879.87 11.70 55.49 6,879.89 11.80 57.42 6,879.91 11.90 59.42 6,879.93 12.00 61.44 6,879.95 12.10 63.50 6,879.97 12.20 65.62 6,879.99 12.30 67.78 6,880.01 12.40 69.97 6,880.03 12.49 72.22 6,880.05 12.59 74.51 6,880.07 12.69 76.83 6,880.09 12.79 79.22 6,880.11 12.88 81.64 6,880.13 12.98 84.10 6,880.15 13.07 86.63 6,880.17 13.17 89.19 6,880.19 13.27 91.79 6,880.21 13.36 94.45 6,880.23 13.45 97.16 6,880.25 13.55 99.90 6,880.27 13.64 102.71 6,880.29 13.74 105.55 6,880.31 13.83 108.44 6,880.33 13.92 111.40 6,880.35 14.02 114.39 6,880.37 14.11 117.42 6,880.39 14.20 120.53 6,880.41 14.29 123.68 6,880.43 14.38 126.86 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,880.45 14.47 130.12 6,880.47 14.57 133.42 6,880.49 14.66 136.76 6,880.51 14.75 140.17 6,880.53 14.84 143.63 6,880.55 14.93 147.12 6,880.57 15.02 150.70 6,880.59 15.10 154.31 6,880.61 15.19 157.97 6,880.63 15.28 161.70 6,880.65 15.37 165.48 6,880.67 15.46 169.30 6,880.69 15.55 173.20 6,880.71 15.64 177.14 6,880.73 15.72 181.12 6,880.75 15.81 185.19 6,880.77 15.90 189.30 6,880.79 15.98 193.45 6,880.81 16.07 197.69 6,880.83 16.16 201.97 6,880.85 16.24 206.29 6,880.87 16.33 210.70 6,880.89 16.41 215.15 6,880.91 16.50 219.65 6,880.93 16.58 224.23 6,880.95 16.67 228.86 6,880.97 16.75 233.54 6,880.99 16.84 238.30 6,881.01 16.92 243.11 6,881.03 17.01 247.96 6,881.05 17.09 252.90 6,881.07 17.17 257.89 6,881.09 17.26 262.93 6,881.11 17.34 268.05 6,881.13 17.42 273.23 6,881.15 17.51 278.45 6,881.17 17.59 283.76 6,881.19 17.67 289.12 6,881.21 17.75 294.53 6,881.23 17.84 300.03 6,881.25 17.92 305.58 6,881.27 18.00 311.17 6,881.29 18.08 316.87 6,881.31 18.16 322.61 6,881.33 18.24 328.40 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 181HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 21R: Reach-05E Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,878.33 0.0 0 6,878.38 0.0 1 6,878.43 0.0 5 6,878.48 0.0 10 6,878.53 0.1 18 6,878.58 0.1 28 6,878.63 0.2 40 6,878.68 0.2 55 6,878.73 0.3 72 6,878.78 0.4 91 6,878.83 0.5 112 6,878.88 0.6 136 6,878.93 0.7 162 6,878.98 0.8 190 6,879.03 1.0 220 6,879.08 1.1 253 6,879.13 1.3 288 6,879.18 1.4 325 6,879.23 1.6 364 6,879.28 1.8 406 6,879.33 2.0 450 6,879.38 2.2 496 6,879.43 2.4 544 6,879.48 2.6 595 6,879.53 2.9 647 6,879.58 3.1 703 6,879.63 3.4 760 6,879.68 3.6 819 6,879.73 3.9 881 6,879.78 4.2 945 6,879.83 4.5 1,012 6,879.88 4.8 1,080 6,879.93 5.1 1,151 6,879.98 5.4 1,224 6,880.03 5.8 1,299 6,880.08 6.1 1,377 6,880.13 6.5 1,457 6,880.18 6.8 1,539 6,880.23 7.2 1,623 6,880.28 7.6 1,710 6,880.33 8.0 1,798 6,880.38 8.4 1,890 6,880.43 8.8 1,983 6,880.48 9.2 2,078 6,880.53 9.7 2,176 6,880.58 10.1 2,276 6,880.63 10.6 2,378 6,880.68 11.0 2,483 6,880.73 11.5 2,590 6,880.78 12.0 2,699 6,880.83 12.5 2,810 6,880.88 13.0 2,924 6,880.93 13.5 3,039 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,880.98 14.0 3,157 6,881.03 14.6 3,278 6,881.08 15.1 3,400 6,881.13 15.7 3,525 6,881.18 16.2 3,652 6,881.23 16.8 3,781 6,881.28 17.4 3,913 6,881.33 18.0 4,046 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 182HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 22R: Reach-05F [62] Hint: Exceeded Reach 21R OUTLET depth by 0.01' @ 29.90 hrs Inflow Area = 114.071 ac, 0.29% Impervious, Inflow Depth > 0.11" for 100-YR event Inflow = 1.44 cfs @ 14.08 hrs, Volume= 1.044 af Outflow = 1.44 cfs @ 14.08 hrs, Volume= 1.044 af, Atten= 0%, Lag= 0.2 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 3.63 fps, Min. Travel Time= 0.3 min Avg. Velocity = 2.68 fps, Avg. Travel Time= 0.4 min Peak Storage= 24 cf @ 14.08 hrs Average Depth at Peak Storage= 0.36' , Surface Width= 2.18' Bank-Full Depth= 0.70' Flow Area= 1.5 sf, Capacity= 8.25 cfs 0.00' x 0.70' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 3.0 '/' Top Width= 4.20' Length= 61.2' Slope= 0.0559 '/' Inlet Invert= 6,857.72', Outlet Invert= 6,854.30' Reach 22R: Reach-05F Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Inflow Area=114.071 ac Avg. Flow Depth=0.36' Max Vel=3.63 fps n=0.030 L=61.2' S=0.0559 '/' Capacity=8.25 cfs 1.44 cfs1.44 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 183HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 22R: Reach-05F Primary Stage-Discharge Discharge (cfs) 876543210Depth (feet)0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Reach 22R: Reach-05F Storage Stage-Storage Storage (cubic-feet) 80706050403020100Depth (feet)0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 184HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 22R: Reach-05F Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,857.72 0.00 5.60 0.00 0 6,857.72 0.00 6.20 0.00 0 6,857.72 0.00 6.80 0.00 0 6,857.72 0.00 7.40 0.00 0 6,857.72 0.00 8.00 0.00 0 6,857.72 0.00 8.60 0.00 0 6,857.72 0.00 9.20 0.00 0 6,857.72 0.00 9.80 0.00 0 6,857.72 0.00 10.40 0.00 0 6,857.72 0.00 11.00 0.00 0 6,857.72 0.00 11.60 0.00 0 6,857.72 0.00 12.20 1.08 19 6,858.05 1.07 12.80 1.25 22 6,858.06 1.25 13.40 1.30 23 6,858.07 1.30 14.00 1.44 24 6,858.08 1.44 14.60 1.40 24 6,858.08 1.40 15.20 1.30 22 6,858.07 1.30 15.80 1.21 21 6,858.06 1.21 16.40 1.12 20 6,858.05 1.12 17.00 1.04 19 6,858.04 1.04 17.60 0.97 18 6,858.03 0.97 18.20 0.93 17 6,858.03 0.93 18.80 0.88 17 6,858.02 0.88 19.40 0.84 16 6,858.02 0.84 20.00 0.79 16 6,858.01 0.79 20.60 0.74 15 6,858.00 0.74 21.20 0.70 14 6,858.00 0.70 21.80 0.67 14 6,857.99 0.67 22.40 0.66 14 6,857.99 0.66 23.00 0.65 13 6,857.99 0.65 23.60 0.64 13 6,857.99 0.64 24.20 0.63 13 6,857.99 0.63 24.80 0.51 11 6,857.97 0.51 25.40 0.30 8 6,857.92 0.30 26.00 0.13 4 6,857.87 0.14 26.60 0.06 2 6,857.83 0.06 27.20 0.03 1 6,857.80 0.03 27.80 0.01 1 6,857.78 0.01 28.40 0.00 0 6,857.76 0.01 29.00 0.00 0 6,857.75 0.00 29.60 0.00 0 6,857.74 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 185HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 22R: Reach-05F Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,857.72 0.00 0.00 6,857.73 0.33 0.00 6,857.74 0.52 0.00 6,857.75 0.69 0.00 6,857.76 0.83 0.00 6,857.77 0.97 0.01 6,857.78 1.09 0.01 6,857.79 1.21 0.02 6,857.80 1.32 0.03 6,857.81 1.43 0.03 6,857.82 1.53 0.05 6,857.83 1.63 0.06 6,857.84 1.73 0.07 6,857.85 1.83 0.09 6,857.86 1.92 0.11 6,857.87 2.01 0.14 6,857.88 2.10 0.16 6,857.89 2.19 0.19 6,857.90 2.27 0.22 6,857.91 2.35 0.26 6,857.92 2.44 0.29 6,857.93 2.52 0.33 6,857.94 2.60 0.38 6,857.95 2.67 0.42 6,857.96 2.75 0.48 6,857.97 2.83 0.53 6,857.98 2.90 0.59 6,857.99 2.98 0.65 6,858.00 3.05 0.72 6,858.01 3.12 0.79 6,858.02 3.19 0.86 6,858.03 3.26 0.94 6,858.04 3.33 1.02 6,858.05 3.40 1.11 6,858.06 3.47 1.20 6,858.07 3.54 1.30 6,858.08 3.60 1.40 6,858.09 3.67 1.51 6,858.10 3.74 1.62 6,858.11 3.80 1.73 6,858.12 3.87 1.86 6,858.13 3.93 1.98 6,858.14 3.99 2.11 6,858.15 4.06 2.25 6,858.16 4.12 2.39 6,858.17 4.18 2.54 6,858.18 4.24 2.69 6,858.19 4.31 2.85 6,858.20 4.37 3.02 6,858.21 4.43 3.19 6,858.22 4.49 3.37 6,858.23 4.55 3.55 6,858.24 4.61 3.74 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,858.25 4.66 3.93 6,858.26 4.72 4.13 6,858.27 4.78 4.34 6,858.28 4.84 4.55 6,858.29 4.90 4.77 6,858.30 4.95 5.00 6,858.31 5.01 5.23 6,858.32 5.07 5.47 6,858.33 5.12 5.72 6,858.34 5.18 5.97 6,858.35 5.23 6.23 6,858.36 5.29 6.50 6,858.37 5.34 6.77 6,858.38 5.40 7.06 6,858.39 5.45 7.34 6,858.40 5.51 7.64 6,858.41 5.56 7.94 6,858.42 5.61 8.25 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 186HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 22R: Reach-05F Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,857.72 0.0 0 6,857.73 0.0 0 6,857.74 0.0 0 6,857.75 0.0 0 6,857.76 0.0 0 6,857.77 0.0 0 6,857.78 0.0 1 6,857.79 0.0 1 6,857.80 0.0 1 6,857.81 0.0 1 6,857.82 0.0 2 6,857.83 0.0 2 6,857.84 0.0 3 6,857.85 0.1 3 6,857.86 0.1 4 6,857.87 0.1 4 6,857.88 0.1 5 6,857.89 0.1 5 6,857.90 0.1 6 6,857.91 0.1 7 6,857.92 0.1 7 6,857.93 0.1 8 6,857.94 0.1 9 6,857.95 0.2 10 6,857.96 0.2 11 6,857.97 0.2 11 6,857.98 0.2 12 6,857.99 0.2 13 6,858.00 0.2 14 6,858.01 0.3 15 6,858.02 0.3 17 6,858.03 0.3 18 6,858.04 0.3 19 6,858.05 0.3 20 6,858.06 0.3 21 6,858.07 0.4 22 6,858.08 0.4 24 6,858.09 0.4 25 6,858.10 0.4 27 6,858.11 0.5 28 6,858.12 0.5 29 6,858.13 0.5 31 6,858.14 0.5 32 6,858.15 0.6 34 6,858.16 0.6 36 6,858.17 0.6 37 6,858.18 0.6 39 6,858.19 0.7 41 6,858.20 0.7 42 6,858.21 0.7 44 6,858.22 0.8 46 6,858.23 0.8 48 6,858.24 0.8 50 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,858.25 0.8 52 6,858.26 0.9 54 6,858.27 0.9 56 6,858.28 0.9 58 6,858.29 1.0 60 6,858.30 1.0 62 6,858.31 1.0 64 6,858.32 1.1 66 6,858.33 1.1 68 6,858.34 1.2 71 6,858.35 1.2 73 6,858.36 1.2 75 6,858.37 1.3 78 6,858.38 1.3 80 6,858.39 1.3 82 6,858.40 1.4 85 6,858.41 1.4 87 6,858.42 1.5 90 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 187HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 23R: Reach-05G [62] Hint: Exceeded Reach 22R OUTLET depth by 0.20' @ 12.26 hrs Inflow Area = 116.291 ac, 0.35% Impervious, Inflow Depth > 0.12" for 100-YR event Inflow = 1.86 cfs @ 12.27 hrs, Volume= 1.120 af Outflow = 1.86 cfs @ 12.28 hrs, Volume= 1.120 af, Atten= 0%, Lag= 0.3 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 2.31 fps, Min. Travel Time= 0.4 min Avg. Velocity = 1.63 fps, Avg. Travel Time= 0.5 min Peak Storage= 43 cf @ 12.28 hrs Average Depth at Peak Storage= 0.54' , Surface Width= 3.00' Bank-Full Depth= 0.56' Flow Area= 0.9 sf, Capacity= 2.09 cfs 0.00' x 0.56' deep channel, n= 0.040 Earth, cobble bottom, clean sides Side Slope Z-value= 3.1 2.5 '/' Top Width= 3.14' Length= 53.6' Slope= 0.0243 '/' Inlet Invert= 6,854.30', Outlet Invert= 6,853.00' Reach 23R: Reach-05G Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)2 1 0 Inflow Area=116.291 ac Avg. Flow Depth=0.54' Max Vel=2.31 fps n=0.040 L=53.6' S=0.0243 '/' Capacity=2.09 cfs 1.86 cfs1.86 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 188HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 23R: Reach-05G Primary Stage-Discharge Discharge (cfs) 210Depth (feet)0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Reach 23R: Reach-05G Storage Stage-Storage Storage (cubic-feet) 454035302520151050Depth (feet)0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 189HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 23R: Reach-05G Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,854.30 0.00 5.60 0.00 0 6,854.30 0.00 6.20 0.00 0 6,854.30 0.00 6.80 0.00 0 6,854.30 0.00 7.40 0.00 0 6,854.30 0.00 8.00 0.00 0 6,854.30 0.00 8.60 0.00 0 6,854.30 0.00 9.20 0.00 0 6,854.30 0.00 9.80 0.00 0 6,854.30 0.00 10.40 0.00 0 6,854.30 0.00 11.00 0.00 0 6,854.30 0.00 11.60 0.00 0 6,854.30 0.00 12.20 1.73 40 6,854.82 1.70 12.80 1.45 36 6,854.79 1.45 13.40 1.42 35 6,854.78 1.41 14.00 1.53 37 6,854.80 1.53 14.60 1.47 36 6,854.79 1.47 15.20 1.37 34 6,854.78 1.37 15.80 1.27 32 6,854.76 1.27 16.40 1.17 31 6,854.75 1.18 17.00 1.09 29 6,854.74 1.09 17.60 1.02 27 6,854.73 1.02 18.20 0.97 26 6,854.72 0.97 18.80 0.92 26 6,854.71 0.92 19.40 0.88 25 6,854.70 0.88 20.00 0.82 23 6,854.70 0.83 20.60 0.77 22 6,854.69 0.77 21.20 0.73 21 6,854.68 0.73 21.80 0.70 21 6,854.67 0.70 22.40 0.69 20 6,854.67 0.69 23.00 0.68 20 6,854.67 0.68 23.60 0.67 20 6,854.67 0.67 24.20 0.66 20 6,854.66 0.66 24.80 0.51 17 6,854.63 0.52 25.40 0.30 11 6,854.57 0.31 26.00 0.14 6 6,854.50 0.14 26.60 0.06 3 6,854.45 0.06 27.20 0.03 2 6,854.41 0.03 27.80 0.01 1 6,854.38 0.01 28.40 0.01 1 6,854.36 0.01 29.00 0.00 0 6,854.34 0.00 29.60 0.00 0 6,854.33 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 190HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 23R: Reach-05G Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,854.30 0.00 0.00 6,854.31 0.16 0.00 6,854.32 0.26 0.00 6,854.33 0.34 0.00 6,854.34 0.41 0.00 6,854.35 0.48 0.00 6,854.36 0.54 0.01 6,854.37 0.59 0.01 6,854.38 0.65 0.01 6,854.39 0.70 0.02 6,854.40 0.75 0.02 6,854.41 0.80 0.03 6,854.42 0.85 0.03 6,854.43 0.90 0.04 6,854.44 0.94 0.05 6,854.45 0.99 0.06 6,854.46 1.03 0.07 6,854.47 1.07 0.09 6,854.48 1.12 0.10 6,854.49 1.16 0.12 6,854.50 1.20 0.13 6,854.51 1.24 0.15 6,854.52 1.28 0.17 6,854.53 1.31 0.19 6,854.54 1.35 0.22 6,854.55 1.39 0.24 6,854.56 1.43 0.27 6,854.57 1.46 0.30 6,854.58 1.50 0.33 6,854.59 1.53 0.36 6,854.60 1.57 0.40 6,854.61 1.60 0.43 6,854.62 1.64 0.47 6,854.63 1.67 0.51 6,854.64 1.71 0.55 6,854.65 1.74 0.60 6,854.66 1.77 0.64 6,854.67 1.80 0.69 6,854.68 1.84 0.74 6,854.69 1.87 0.80 6,854.70 1.90 0.85 6,854.71 1.93 0.91 6,854.72 1.96 0.97 6,854.73 1.99 1.03 6,854.74 2.02 1.10 6,854.75 2.06 1.17 6,854.76 2.09 1.24 6,854.77 2.12 1.31 6,854.78 2.15 1.38 6,854.79 2.18 1.46 6,854.80 2.21 1.54 6,854.81 2.23 1.63 6,854.82 2.26 1.71 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,854.83 2.29 1.80 6,854.84 2.32 1.90 6,854.85 2.35 1.99 6,854.86 2.38 2.09 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 191HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 23R: Reach-05G Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,854.30 0.0 0 6,854.31 0.0 0 6,854.32 0.0 0 6,854.33 0.0 0 6,854.34 0.0 0 6,854.35 0.0 0 6,854.36 0.0 1 6,854.37 0.0 1 6,854.38 0.0 1 6,854.39 0.0 1 6,854.40 0.0 2 6,854.41 0.0 2 6,854.42 0.0 2 6,854.43 0.0 3 6,854.44 0.1 3 6,854.45 0.1 3 6,854.46 0.1 4 6,854.47 0.1 4 6,854.48 0.1 5 6,854.49 0.1 5 6,854.50 0.1 6 6,854.51 0.1 7 6,854.52 0.1 7 6,854.53 0.1 8 6,854.54 0.2 9 6,854.55 0.2 9 6,854.56 0.2 10 6,854.57 0.2 11 6,854.58 0.2 12 6,854.59 0.2 13 6,854.60 0.3 14 6,854.61 0.3 14 6,854.62 0.3 15 6,854.63 0.3 16 6,854.64 0.3 17 6,854.65 0.3 18 6,854.66 0.4 19 6,854.67 0.4 21 6,854.68 0.4 22 6,854.69 0.4 23 6,854.70 0.4 24 6,854.71 0.5 25 6,854.72 0.5 26 6,854.73 0.5 28 6,854.74 0.5 29 6,854.75 0.6 30 6,854.76 0.6 32 6,854.77 0.6 33 6,854.78 0.6 35 6,854.79 0.7 36 6,854.80 0.7 38 6,854.81 0.7 39 6,854.82 0.8 41 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,854.83 0.8 42 6,854.84 0.8 44 6,854.85 0.8 45 6,854.86 0.9 47 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 192HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 28R: Reach-05H [61] Hint: Exceeded Reach 23R outlet invert by 0.44' @ 12.29 hrs Inflow Area = 116.291 ac, 0.35% Impervious, Inflow Depth > 0.12" for 100-YR event Inflow = 1.86 cfs @ 12.28 hrs, Volume= 1.120 af Outflow = 1.86 cfs @ 12.29 hrs, Volume= 1.120 af, Atten= 0%, Lag= 0.5 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 2.76 fps, Min. Travel Time= 0.5 min Avg. Velocity = 1.95 fps, Avg. Travel Time= 0.8 min Peak Storage= 60 cf @ 12.29 hrs Average Depth at Peak Storage= 0.44' , Surface Width= 3.07' Bank-Full Depth= 0.65' Flow Area= 1.5 sf, Capacity= 5.31 cfs 0.00' x 0.65' deep channel, n= 0.040 Earth, cobble bottom, clean sides Side Slope Z-value= 2.0 5.0 '/' Top Width= 4.55' Length= 89.9' Slope= 0.0445 '/' Inlet Invert= 6,853.00', Outlet Invert= 6,849.00' Reach 28R: Reach-05H Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)2 1 0 Inflow Area=116.291 ac Avg. Flow Depth=0.44' Max Vel=2.76 fps n=0.040 L=89.9' S=0.0445 '/' Capacity=5.31 cfs 1.86 cfs1.86 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 193HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 28R: Reach-05H Primary Stage-Discharge Discharge (cfs) 543210Depth (feet)0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Reach 28R: Reach-05H Storage Stage-Storage Storage (cubic-feet) 1301201101009080706050403020100Depth (feet)0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 194HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 28R: Reach-05H Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,853.00 0.00 5.60 0.00 0 6,853.00 0.00 6.20 0.00 0 6,853.00 0.00 6.80 0.00 0 6,853.00 0.00 7.40 0.00 0 6,853.00 0.00 8.00 0.00 0 6,853.00 0.00 8.60 0.00 0 6,853.00 0.00 9.20 0.00 0 6,853.00 0.00 9.80 0.00 0 6,853.00 0.00 10.40 0.00 0 6,853.00 0.00 11.00 0.00 0 6,853.00 0.00 11.60 0.00 0 6,853.00 0.00 12.20 1.70 56 6,853.42 1.67 12.80 1.45 50 6,853.40 1.46 13.40 1.41 49 6,853.40 1.41 14.00 1.53 52 6,853.41 1.53 14.60 1.47 51 6,853.40 1.47 15.20 1.37 48 6,853.39 1.37 15.80 1.27 45 6,853.38 1.27 16.40 1.18 43 6,853.37 1.18 17.00 1.09 41 6,853.36 1.09 17.60 1.02 39 6,853.35 1.02 18.20 0.97 37 6,853.34 0.97 18.80 0.92 36 6,853.34 0.92 19.40 0.88 34 6,853.33 0.88 20.00 0.83 33 6,853.32 0.83 20.60 0.77 31 6,853.32 0.77 21.20 0.73 30 6,853.31 0.73 21.80 0.70 29 6,853.30 0.70 22.40 0.69 29 6,853.30 0.69 23.00 0.68 28 6,853.30 0.68 23.60 0.67 28 6,853.30 0.67 24.20 0.66 28 6,853.30 0.66 24.80 0.52 23 6,853.27 0.52 25.40 0.31 16 6,853.22 0.31 26.00 0.14 9 6,853.17 0.14 26.60 0.06 5 6,853.12 0.06 27.20 0.03 3 6,853.09 0.03 27.80 0.01 1 6,853.07 0.01 28.40 0.01 1 6,853.05 0.01 29.00 0.00 0 6,853.03 0.00 29.60 0.00 0 6,853.02 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 195HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 28R: Reach-05H Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,853.00 0.00 0.00 6,853.01 0.22 0.00 6,853.02 0.35 0.00 6,853.03 0.46 0.00 6,853.04 0.56 0.00 6,853.05 0.65 0.01 6,853.06 0.73 0.01 6,853.07 0.81 0.01 6,853.08 0.89 0.02 6,853.09 0.96 0.03 6,853.10 1.03 0.04 6,853.11 1.10 0.05 6,853.12 1.16 0.06 6,853.13 1.23 0.07 6,853.14 1.29 0.09 6,853.15 1.35 0.11 6,853.16 1.41 0.13 6,853.17 1.47 0.15 6,853.18 1.53 0.17 6,853.19 1.58 0.20 6,853.20 1.64 0.23 6,853.21 1.69 0.26 6,853.22 1.74 0.30 6,853.23 1.80 0.33 6,853.24 1.85 0.37 6,853.25 1.90 0.42 6,853.26 1.95 0.46 6,853.27 2.00 0.51 6,853.28 2.05 0.56 6,853.29 2.10 0.62 6,853.30 2.14 0.68 6,853.31 2.19 0.74 6,853.32 2.24 0.80 6,853.33 2.29 0.87 6,853.34 2.33 0.94 6,853.35 2.38 1.02 6,853.36 2.42 1.10 6,853.37 2.47 1.18 6,853.38 2.51 1.27 6,853.39 2.55 1.36 6,853.40 2.60 1.45 6,853.41 2.64 1.55 6,853.42 2.68 1.66 6,853.43 2.73 1.76 6,853.44 2.77 1.88 6,853.45 2.81 1.99 6,853.46 2.85 2.11 6,853.47 2.89 2.24 6,853.48 2.93 2.37 6,853.49 2.97 2.50 6,853.50 3.01 2.64 6,853.51 3.05 2.78 6,853.52 3.09 2.93 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,853.53 3.13 3.08 6,853.54 3.17 3.24 6,853.55 3.21 3.40 6,853.56 3.25 3.57 6,853.57 3.29 3.74 6,853.58 3.33 3.92 6,853.59 3.37 4.10 6,853.60 3.40 4.29 6,853.61 3.44 4.48 6,853.62 3.48 4.68 6,853.63 3.52 4.89 6,853.64 3.55 5.09 6,853.65 3.59 5.31 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 196HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 28R: Reach-05H Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,853.00 0.0 0 6,853.01 0.0 0 6,853.02 0.0 0 6,853.03 0.0 0 6,853.04 0.0 1 6,853.05 0.0 1 6,853.06 0.0 1 6,853.07 0.0 2 6,853.08 0.0 2 6,853.09 0.0 3 6,853.10 0.0 3 6,853.11 0.0 4 6,853.12 0.1 5 6,853.13 0.1 5 6,853.14 0.1 6 6,853.15 0.1 7 6,853.16 0.1 8 6,853.17 0.1 9 6,853.18 0.1 10 6,853.19 0.1 11 6,853.20 0.1 13 6,853.21 0.2 14 6,853.22 0.2 15 6,853.23 0.2 17 6,853.24 0.2 18 6,853.25 0.2 20 6,853.26 0.2 21 6,853.27 0.3 23 6,853.28 0.3 25 6,853.29 0.3 26 6,853.30 0.3 28 6,853.31 0.3 30 6,853.32 0.4 32 6,853.33 0.4 34 6,853.34 0.4 36 6,853.35 0.4 39 6,853.36 0.5 41 6,853.37 0.5 43 6,853.38 0.5 45 6,853.39 0.5 48 6,853.40 0.6 50 6,853.41 0.6 53 6,853.42 0.6 56 6,853.43 0.6 58 6,853.44 0.7 61 6,853.45 0.7 64 6,853.46 0.7 67 6,853.47 0.8 70 6,853.48 0.8 72 6,853.49 0.8 76 6,853.50 0.9 79 6,853.51 0.9 82 6,853.52 0.9 85 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,853.53 1.0 88 6,853.54 1.0 92 6,853.55 1.1 95 6,853.56 1.1 99 6,853.57 1.1 102 6,853.58 1.2 106 6,853.59 1.2 110 6,853.60 1.3 113 6,853.61 1.3 117 6,853.62 1.3 121 6,853.63 1.4 125 6,853.64 1.4 129 6,853.65 1.5 133 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 197HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 31R: Reach-05I [61] Hint: Exceeded Reach 28R outlet invert by 0.42' @ 12.29 hrs Inflow Area = 118.251 ac, 0.39% Impervious, Inflow Depth > 0.12" for 100-YR event Inflow = 2.22 cfs @ 12.29 hrs, Volume= 1.175 af Outflow = 2.22 cfs @ 12.29 hrs, Volume= 1.175 af, Atten= 0%, Lag= 0.3 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 3.61 fps, Min. Travel Time= 0.4 min Avg. Velocity = 2.47 fps, Avg. Travel Time= 0.5 min Peak Storage= 50 cf @ 12.29 hrs Average Depth at Peak Storage= 0.42' , Surface Width= 2.93' Bank-Full Depth= 0.65' Flow Area= 1.5 sf, Capacity= 7.16 cfs 0.00' x 0.65' deep channel, n= 0.040 Earth, cobble bottom, clean sides Side Slope Z-value= 2.0 5.0 '/' Top Width= 4.55' Length= 80.7' Slope= 0.0809 '/' Inlet Invert= 6,849.00', Outlet Invert= 6,842.47' Reach 31R: Reach-05I Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)2 1 0 Inflow Area=118.251 ac Avg. Flow Depth=0.42' Max Vel=3.61 fps n=0.040 L=80.7' S=0.0809 '/' Capacity=7.16 cfs 2.22 cfs2.22 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 198HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 31R: Reach-05I Primary Stage-Discharge Discharge (cfs) 76543210Depth (feet)0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Reach 31R: Reach-05I Storage Stage-Storage Storage (cubic-feet) 1101009080706050403020100Depth (feet)0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 199HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 31R: Reach-05I Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,849.00 0.00 5.60 0.00 0 6,849.00 0.00 6.20 0.00 0 6,849.00 0.00 6.80 0.00 0 6,849.00 0.00 7.40 0.00 0 6,849.00 0.00 8.00 0.00 0 6,849.00 0.00 8.60 0.00 0 6,849.00 0.00 9.20 0.00 0 6,849.00 0.00 9.80 0.00 0 6,849.00 0.00 10.40 0.00 0 6,849.00 0.00 11.00 0.00 0 6,849.00 0.00 11.60 0.00 0 6,849.00 0.00 12.20 1.98 45 6,849.40 1.94 12.80 1.62 39 6,849.37 1.63 13.40 1.50 37 6,849.36 1.50 14.00 1.60 39 6,849.37 1.60 14.60 1.53 37 6,849.36 1.53 15.20 1.42 35 6,849.35 1.42 15.80 1.31 33 6,849.34 1.32 16.40 1.22 32 6,849.33 1.22 17.00 1.13 30 6,849.32 1.13 17.60 1.05 28 6,849.32 1.06 18.20 1.00 27 6,849.31 1.00 18.80 0.95 26 6,849.31 0.95 19.40 0.91 25 6,849.30 0.91 20.00 0.85 24 6,849.29 0.85 20.60 0.80 23 6,849.29 0.80 21.20 0.75 22 6,849.28 0.75 21.80 0.73 21 6,849.28 0.73 22.40 0.71 21 6,849.27 0.71 23.00 0.70 21 6,849.27 0.70 23.60 0.69 21 6,849.27 0.69 24.20 0.68 20 6,849.27 0.68 24.80 0.52 17 6,849.24 0.52 25.40 0.31 11 6,849.20 0.31 26.00 0.14 6 6,849.15 0.14 26.60 0.06 3 6,849.11 0.06 27.20 0.03 2 6,849.08 0.03 27.80 0.01 1 6,849.06 0.01 28.40 0.01 1 6,849.04 0.01 29.00 0.00 0 6,849.03 0.00 29.60 0.00 0 6,849.02 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 200HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 31R: Reach-05I Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,849.00 0.00 0.00 6,849.01 0.30 0.00 6,849.02 0.48 0.00 6,849.03 0.62 0.00 6,849.04 0.75 0.00 6,849.05 0.88 0.01 6,849.06 0.99 0.01 6,849.07 1.10 0.02 6,849.08 1.20 0.03 6,849.09 1.30 0.04 6,849.10 1.39 0.05 6,849.11 1.48 0.06 6,849.12 1.57 0.08 6,849.13 1.66 0.10 6,849.14 1.74 0.12 6,849.15 1.82 0.14 6,849.16 1.90 0.17 6,849.17 1.98 0.20 6,849.18 2.06 0.23 6,849.19 2.13 0.27 6,849.20 2.21 0.31 6,849.21 2.28 0.35 6,849.22 2.35 0.40 6,849.23 2.42 0.45 6,849.24 2.49 0.50 6,849.25 2.56 0.56 6,849.26 2.63 0.62 6,849.27 2.70 0.69 6,849.28 2.76 0.76 6,849.29 2.83 0.83 6,849.30 2.89 0.91 6,849.31 2.96 0.99 6,849.32 3.02 1.08 6,849.33 3.08 1.17 6,849.34 3.14 1.27 6,849.35 3.20 1.37 6,849.36 3.27 1.48 6,849.37 3.33 1.59 6,849.38 3.39 1.71 6,849.39 3.44 1.83 6,849.40 3.50 1.96 6,849.41 3.56 2.10 6,849.42 3.62 2.23 6,849.43 3.68 2.38 6,849.44 3.73 2.53 6,849.45 3.79 2.69 6,849.46 3.85 2.85 6,849.47 3.90 3.02 6,849.48 3.96 3.19 6,849.49 4.01 3.37 6,849.50 4.07 3.56 6,849.51 4.12 3.75 6,849.52 4.17 3.95 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,849.53 4.23 4.16 6,849.54 4.28 4.37 6,849.55 4.33 4.59 6,849.56 4.38 4.81 6,849.57 4.44 5.04 6,849.58 4.49 5.28 6,849.59 4.54 5.53 6,849.60 4.59 5.78 6,849.61 4.64 6.04 6,849.62 4.69 6.31 6,849.63 4.74 6.59 6,849.64 4.79 6.87 6,849.65 4.84 7.16 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 201HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 31R: Reach-05I Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,849.00 0.0 0 6,849.01 0.0 0 6,849.02 0.0 0 6,849.03 0.0 0 6,849.04 0.0 0 6,849.05 0.0 1 6,849.06 0.0 1 6,849.07 0.0 1 6,849.08 0.0 2 6,849.09 0.0 2 6,849.10 0.0 3 6,849.11 0.0 3 6,849.12 0.1 4 6,849.13 0.1 5 6,849.14 0.1 6 6,849.15 0.1 6 6,849.16 0.1 7 6,849.17 0.1 8 6,849.18 0.1 9 6,849.19 0.1 10 6,849.20 0.1 11 6,849.21 0.2 12 6,849.22 0.2 14 6,849.23 0.2 15 6,849.24 0.2 16 6,849.25 0.2 18 6,849.26 0.2 19 6,849.27 0.3 21 6,849.28 0.3 22 6,849.29 0.3 24 6,849.30 0.3 25 6,849.31 0.3 27 6,849.32 0.4 29 6,849.33 0.4 31 6,849.34 0.4 33 6,849.35 0.4 35 6,849.36 0.5 37 6,849.37 0.5 39 6,849.38 0.5 41 6,849.39 0.5 43 6,849.40 0.6 45 6,849.41 0.6 47 6,849.42 0.6 50 6,849.43 0.6 52 6,849.44 0.7 55 6,849.45 0.7 57 6,849.46 0.7 60 6,849.47 0.8 62 6,849.48 0.8 65 6,849.49 0.8 68 6,849.50 0.9 71 6,849.51 0.9 73 6,849.52 0.9 76 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,849.53 1.0 79 6,849.54 1.0 82 6,849.55 1.1 85 6,849.56 1.1 89 6,849.57 1.1 92 6,849.58 1.2 95 6,849.59 1.2 98 6,849.60 1.3 102 6,849.61 1.3 105 6,849.62 1.3 109 6,849.63 1.4 112 6,849.64 1.4 116 6,849.65 1.5 119 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 202HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Pond 8P: PRE-AREA-07A-CULVERT [57] Hint: Peaked at 6,995.11' (Flood elevation advised) Inflow Area = 5.631 ac, 0.00% Impervious, Inflow Depth = 0.31" for 100-YR event Inflow = 0.60 cfs @ 12.73 hrs, Volume= 0.143 af Outflow = 0.60 cfs @ 12.73 hrs, Volume= 0.143 af, Atten= 0%, Lag= 0.0 min Primary = 0.12 cfs @ 12.73 hrs, Volume= 0.094 af Secondary = 0.48 cfs @ 12.73 hrs, Volume= 0.049 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Peak Elev= 6,995.11' @ 12.73 hrs Device Routing Invert Outlet Devices #1 Primary 6,993.74'18.0" Round Culvert w/ 16.5" inside fill L= 30.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 6,992.37' / 6,991.77' S= 0.0200 '/' Cc= 0.900 n= 0.025 Corrugated metal, Flow Area= 0.07 sf #2 Secondary 6,994.87'Channel/Reach using Reach 9R: Reach 7A-6 Primary OutFlow Max=0.12 cfs @ 12.73 hrs HW=6,995.11' TW=6,991.79' (Dynamic Tailwater) 1=Culvert (Barrel Controls 0.12 cfs @ 1.71 fps) Secondary OutFlow Max=0.48 cfs @ 12.73 hrs HW=6,995.11' TW=6,995.11' (Dynamic Tailwater) 2=Channel/Reach (Channel Controls 0.48 cfs @ 3.27 fps) Pond 8P: PRE-AREA-07A-CULVERT Inflow Outflow Primary Secondary Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=5.631 ac Peak Elev=6,995.11' 0.60 cfs0.60 cfs 0.12 cfs 0.48 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 203HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Pond 8P: PRE-AREA-07A-CULVERT Total Primary Secondary Stage-Discharge Discharge (cfs) 20181614121086420Elevation (feet)6,995 6,994 Culvert Initial Tailwater Channel/Reach Pond 8P: PRE-AREA-07A-CULVERT Storage Stage-Area-Storage Storage (acre-feet) 0Elevation (feet)6,995 6,994 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 204HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Pond 8P: PRE-AREA-07A-CULVERT Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) Primary (cfs) Secondary (cfs) 5.00 0.00 6,993.74 0.00 0.00 0.00 5.60 0.00 6,993.74 0.00 0.00 0.00 6.20 0.00 6,993.74 0.00 0.00 0.00 6.80 0.00 6,993.74 0.00 0.00 0.00 7.40 0.00 6,993.74 0.00 0.00 0.00 8.00 0.00 6,993.74 0.00 0.00 0.00 8.60 0.00 6,993.74 0.00 0.00 0.00 9.20 0.00 6,993.74 0.00 0.00 0.00 9.80 0.00 6,993.74 0.00 0.00 0.00 10.40 0.00 6,993.74 0.00 0.00 0.00 11.00 0.00 6,993.74 0.00 0.00 0.00 11.60 0.00 6,993.74 0.00 0.00 0.00 12.20 0.14 6,994.95 0.14 0.11 0.02 12.80 0.59 6,995.11 0.59 0.12 0.47 13.40 0.35 6,995.05 0.35 0.12 0.23 14.00 0.23 6,995.01 0.23 0.12 0.11 14.60 0.17 6,994.98 0.17 0.12 0.06 15.20 0.15 6,994.96 0.15 0.12 0.03 15.80 0.13 6,994.94 0.13 0.11 0.01 16.40 0.11 6,994.90 0.11 0.11 0.00 17.00 0.10 6,994.62 0.10 0.10 0.00 17.60 0.10 6,994.46 0.10 0.10 0.00 18.20 0.09 6,994.33 0.09 0.09 0.00 18.80 0.09 6,994.21 0.09 0.09 0.00 19.40 0.08 6,994.08 0.08 0.08 0.00 20.00 0.07 6,993.96 0.07 0.07 0.00 20.60 0.07 6,993.87 0.07 0.07 0.00 21.20 0.06 6,993.86 0.06 0.06 0.00 21.80 0.06 6,993.86 0.06 0.06 0.00 22.40 0.06 6,993.86 0.06 0.06 0.00 23.00 0.06 6,993.86 0.06 0.06 0.00 23.60 0.06 6,993.85 0.06 0.06 0.00 24.20 0.06 6,993.85 0.06 0.06 0.00 24.80 0.03 6,993.80 0.03 0.03 0.00 25.40 0.01 6,993.76 0.01 0.01 0.00 26.00 0.00 6,993.75 0.00 0.00 0.00 26.60 0.00 6,993.75 0.00 0.00 0.00 27.20 0.00 6,993.74 0.00 0.00 0.00 27.80 0.00 6,993.74 0.00 0.00 0.00 28.40 0.00 6,993.74 0.00 0.00 0.00 29.00 0.00 6,993.74 0.00 0.00 0.00 29.60 0.00 6,993.74 0.00 0.00 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 205HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Pond 8P: PRE-AREA-07A-CULVERT Elevation (feet) Discharge (cfs) Primary (cfs) Secondary (cfs) 6,993.74 0.00 0.00 0.00 6,993.80 0.02 0.02 0.00 6,993.85 0.05 0.05 0.00 6,993.89 0.08 0.08 0.00 6,993.94 0.07 0.07 0.00 6,993.99 0.08 0.08 0.00 6,994.05 0.08 0.08 0.00 6,994.10 0.08 0.08 0.00 6,994.14 0.08 0.08 0.00 6,994.19 0.09 0.09 0.00 6,994.24 0.09 0.09 0.00 6,994.30 0.09 0.09 0.00 6,994.35 0.09 0.09 0.00 6,994.39 0.09 0.09 0.00 6,994.44 0.10 0.10 0.00 6,994.49 0.10 0.10 0.00 6,994.55 0.10 0.10 0.00 6,994.60 0.10 0.10 0.00 6,994.64 0.10 0.10 0.00 6,994.69 0.11 0.11 0.00 6,994.74 0.11 0.11 0.00 6,994.80 0.11 0.11 0.00 6,994.85 0.11 0.11 0.00 6,994.89 0.11 0.11 0.00 6,994.94 0.14 0.11 0.02 6,994.99 0.20 0.12 0.08 6,995.05 0.32 0.12 0.20 6,995.10 0.51 0.12 0.39 6,995.14 0.79 0.12 0.67 6,995.19 1.17 0.12 1.05 6,995.24 1.66 0.12 1.54 6,995.30 2.27 0.13 2.14 6,995.35 3.01 0.13 2.88 6,995.39 3.90 0.13 3.77 6,995.44 4.93 0.13 4.80 6,995.49 6.13 0.13 6.00 6,995.55 7.50 0.13 7.36 6,995.60 9.04 0.14 8.91 6,995.64 10.78 0.14 10.64 6,995.69 12.71 0.14 12.57 6,995.74 14.85 0.14 14.71 6,995.80 17.20 0.14 17.06 6,995.85 19.77 0.14 19.63 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 206HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 8P: PRE-AREA-07A-CULVERT Elevation (feet) Storage (acre-feet) 6,993.74 0.000 6,993.77 0.000 6,993.78 0.000 6,993.81 0.000 6,993.82 0.000 6,993.85 0.000 6,993.86 0.000 6,993.89 0.000 6,993.90 0.000 6,993.93 0.000 6,993.94 0.000 6,993.97 0.000 6,993.98 0.000 6,994.01 0.000 6,994.02 0.000 6,994.05 0.000 6,994.06 0.000 6,994.09 0.000 6,994.10 0.000 6,994.13 0.000 6,994.14 0.000 6,994.16 0.000 6,994.18 0.000 6,994.20 0.000 6,994.22 0.000 6,994.24 0.000 6,994.27 0.000 6,994.28 0.000 6,994.31 0.000 6,994.32 0.000 6,994.35 0.000 6,994.36 0.000 6,994.39 0.000 6,994.40 0.000 6,994.43 0.000 6,994.44 0.000 6,994.47 0.000 6,994.48 0.000 6,994.51 0.000 6,994.52 0.000 6,994.55 0.000 6,994.56 0.000 6,994.59 0.000 6,994.60 0.000 6,994.63 0.000 6,994.64 0.000 6,994.66 0.000 6,994.68 0.000 6,994.70 0.000 6,994.72 0.000 6,994.74 0.000 6,994.77 0.000 6,994.78 0.000 Elevation (feet) Storage (acre-feet) 6,994.81 0.000 6,994.82 0.000 6,994.85 0.000 6,994.86 0.000 6,994.89 0.000 6,994.90 0.000 6,994.93 0.000 6,994.94 0.000 6,994.97 0.000 6,994.98 0.000 6,995.01 0.000 6,995.02 0.000 6,995.05 0.000 6,995.06 0.000 6,995.09 0.000 6,995.10 0.000 6,995.13 0.000 6,995.14 0.000 6,995.16 0.000 6,995.18 0.000 6,995.20 0.000 6,995.22 0.000 6,995.24 0.000 6,995.27 0.000 6,995.28 0.000 6,995.31 0.000 6,995.32 0.000 6,995.35 0.000 6,995.36 0.000 6,995.39 0.000 6,995.40 0.000 6,995.43 0.000 6,995.44 0.000 6,995.47 0.000 6,995.48 0.000 6,995.51 0.000 6,995.52 0.000 6,995.55 0.000 6,995.56 0.000 6,995.59 0.000 6,995.60 0.000 6,995.63 0.000 6,995.64 0.000 6,995.66 0.000 6,995.68 0.000 6,995.70 0.000 6,995.72 0.000 6,995.74 0.000 6,995.77 0.000 6,995.78 0.000 6,995.81 0.000 6,995.82 0.000 6,995.85 0.000 Elevation (feet) Storage (acre-feet) 6,995.86 0.000 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 207HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment 7S: PRE-AREA-07A Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 25-YR 2.21 0.18 0.063 0.13 100-YR 2.81 0.60 0.143 0.31 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 208HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment 10S: PRE-AREA-06 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 25-YR 2.21 0.14 0.105 0.02 100-YR 2.81 0.79 0.548 0.09 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 209HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment 11S: PRE-AREA-05 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 25-YR 2.21 0.05 0.038 0.02 100-YR 2.81 0.28 0.199 0.09 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 210HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment 24S: PRE-AREA-04A Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 25-YR 2.21 0.05 0.012 0.19 100-YR 2.81 0.14 0.025 0.39 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 211HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment 25S: PRE-AREA-04B Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 25-YR 2.21 0.07 0.014 0.20 100-YR 2.81 0.19 0.027 0.42 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 212HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment 26S: PRE-AREA-04C Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 25-YR 2.21 0.34 0.051 0.22 100-YR 2.81 0.88 0.100 0.45 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 213HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment 30S: PRE-AREA-04D-1 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 25-YR 2.21 0.24 0.038 0.20 100-YR 2.81 0.67 0.077 0.42 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 214HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment 32S: PRE-AREA-04D-2 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 25-YR 2.21 0.11 0.025 0.15 100-YR 2.81 0.37 0.054 0.33 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 215HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 9R: Reach 7A-6 Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 0.06 0.06 6,994.98 20 100-YR 0.48 0.48 6,995.11 92 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 216HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 13R: PRE-AREA-06-CULVERT Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 0.14 0.14 6,945.46 3 100-YR 0.89 0.89 6,945.61 10 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 217HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 14R: Reach-07A Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 0.12 0.12 6,991.79 29 100-YR 0.12 0.12 6,991.79 30 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 218HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 15R: Reach-06 Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 0.14 0.14 6,944.14 18 100-YR 0.89 0.89 6,944.17 68 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 219HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 16R: PRE-AREA-05-CULVERT Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 0.05 0.05 6,923.93 1 100-YR 0.28 0.28 6,923.99 3 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 220HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 17R: Reach-05A Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 0.05 0.05 6,922.89 10 100-YR 0.28 0.28 6,922.91 34 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 221HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 18R: Reach-05B Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 0.06 0.06 6,897.47 6 100-YR 0.31 0.31 6,897.60 23 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 222HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 19R: Reach-05C Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 0.20 0.20 6,895.81 19 100-YR 1.22 1.22 6,896.00 73 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 223HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 20R: Reach-05D Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 0.20 0.20 6,891.18 6 100-YR 1.22 1.22 6,891.36 23 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 224HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 21R: Reach-05E Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 0.46 0.46 6,878.58 29 100-YR 1.44 1.44 6,878.72 69 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 225HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 22R: Reach-05F Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 0.46 0.46 6,857.96 10 100-YR 1.44 1.44 6,858.08 24 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 226HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 23R: Reach-05G Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 0.68 0.68 6,854.67 20 100-YR 1.86 1.86 6,854.84 43 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 227HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 28R: Reach-05H Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 0.68 0.68 6,853.30 29 100-YR 1.86 1.86 6,853.44 60 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 228HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 31R: Reach-05I Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 0.79 0.79 6,849.28 23 100-YR 2.22 2.22 6,849.42 50 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 229HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Pond 8P: PRE-AREA-07A-CULVERT Event Inflow (cfs) Outflow (cfs) Primary (cfs) Secondary (cfs) Elevation (feet) Storage (acre-feet) 25-YR 0.18 0.18 0.12 0.06 6,994.98 0.000 100-YR 0.60 0.60 0.12 0.48 6,995.11 0.000 Table of Contents03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC TABLE OF CONTENTS Project Reports 1 Routing Diagram 2 Rainfall Events Listing (selected events) 3 Area Listing (selected nodes) 4 Soil Listing (selected nodes) 5 Ground Covers (selected nodes) 6 Pipe Listing (selected nodes) 25-YR Event 7 Node Listing 9 Subcat 7S: PRE-AREA-07A 11 Subcat 10S: PRE-AREA-06 13 Subcat 11S: PRE-AREA-05 16 Subcat 24S: PRE-AREA-04A 18 Subcat 25S: PRE-AREA-04B 20 Subcat 26S: PRE-AREA-04C 23 Subcat 30S: PRE-AREA-04D-1 26 Subcat 32S: PRE-AREA-04D-2 29 Reach 9R: Reach 7A-6 34 Reach 13R: PRE-AREA-06-CULVERT 40 Reach 14R: Reach-07A 45 Reach 15R: Reach-06 50 Reach 16R: PRE-AREA-05-CULVERT 55 Reach 17R: Reach-05A 60 Reach 18R: Reach-05B 65 Reach 19R: Reach-05C 71 Reach 20R: Reach-05D 76 Reach 21R: Reach-05E 82 Reach 22R: Reach-05F 87 Reach 23R: Reach-05G 92 Reach 28R: Reach-05H 97 Reach 31R: Reach-05I 102 Pond 8P: PRE-AREA-07A-CULVERT 100-YR Event 107 Node Listing 109 Subcat 7S: PRE-AREA-07A 111 Subcat 10S: PRE-AREA-06 113 Subcat 11S: PRE-AREA-05 116 Subcat 24S: PRE-AREA-04A 118 Subcat 25S: PRE-AREA-04B 120 Subcat 26S: PRE-AREA-04C 123 Subcat 30S: PRE-AREA-04D-1 126 Subcat 32S: PRE-AREA-04D-2 129 Reach 9R: Reach 7A-6 134 Reach 13R: PRE-AREA-06-CULVERT 140 Reach 14R: Reach-07A 145 Reach 15R: Reach-06 150 Reach 16R: PRE-AREA-05-CULVERT 155 Reach 17R: Reach-05A 160 Reach 18R: Reach-05B Table of Contents03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC 165 Reach 19R: Reach-05C 171 Reach 20R: Reach-05D 176 Reach 21R: Reach-05E 182 Reach 22R: Reach-05F 187 Reach 23R: Reach-05G 192 Reach 28R: Reach-05H 197 Reach 31R: Reach-05I 202 Pond 8P: PRE-AREA-07A-CULVERT Multi-Event Tables 207 Subcat 7S: PRE-AREA-07A 208 Subcat 10S: PRE-AREA-06 209 Subcat 11S: PRE-AREA-05 210 Subcat 24S: PRE-AREA-04A 211 Subcat 25S: PRE-AREA-04B 212 Subcat 26S: PRE-AREA-04C 213 Subcat 30S: PRE-AREA-04D-1 214 Subcat 32S: PRE-AREA-04D-2 215 Reach 9R: Reach 7A-6 216 Reach 13R: PRE-AREA-06-CULVERT 217 Reach 14R: Reach-07A 218 Reach 15R: Reach-06 219 Reach 16R: PRE-AREA-05-CULVERT 220 Reach 17R: Reach-05A 221 Reach 18R: Reach-05B 222 Reach 19R: Reach-05C 223 Reach 20R: Reach-05D 224 Reach 21R: Reach-05E 225 Reach 22R: Reach-05F 226 Reach 23R: Reach-05G 227 Reach 28R: Reach-05H 228 Reach 31R: Reach-05I 229 Pond 8P: PRE-AREA-07A-CULVERT APPENDIX A2 Pre-Development 25-Year and 100-Year Hydrologic Analysis For Tributary Area-01 39S PRE-AREA-01 Routing Diagram for 03385-2020-20210713 Prepared by Gamba Engineering, Printed 7/14/2021 HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcat Reach Pond Link 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 2HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 25-YR Type II 24-hr Default 24.00 1 2.21 2 2 100-YR Type II 24-hr Default 24.00 1 2.81 2 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 3HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 4.761 71 Meadow, non-grazed, HSG C (39S) 1.083 57 Oak/aspen range, Fair, HSG C (39S) 0.093 98 Paved parking, HSG C (39S) 5.937 69 TOTAL AREA 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 4HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Soil Listing (selected nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 5.937 HSG C 39S 0.000 HSG D 0.000 Other 5.937 TOTAL AREA 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 5HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Ground Covers (selected nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 4.761 0.000 0.000 4.761 Meadow, non-grazed 39S 0.000 0.000 1.083 0.000 0.000 1.083 Oak/aspen range, Fair 39S 0.000 0.000 0.093 0.000 0.000 0.093 Paved parking 39S 0.000 0.000 5.937 0.000 0.000 5.937 TOTAL AREA Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 6HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Time span=5.00-30.00 hrs, dt=0.03 hrs, 834 points x 3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=5.937 ac 1.57% Impervious Runoff Depth=0.39"Subcatchment 39S: PRE-AREA-01 Flow Length=861' Tc=21.7 min CN=69 Runoff=2.00 cfs 0.194 af Total Runoff Area = 5.937 ac Runoff Volume = 0.194 af Average Runoff Depth = 0.39" 98.43% Pervious = 5.844 ac 1.57% Impervious = 0.093 ac Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 7HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 39S: PRE-AREA-01 Runoff = 2.00 cfs @ 12.18 hrs, Volume= 0.194 af, Depth= 0.39" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.15 Area (ac) CN Description 4.761 71 Meadow, non-grazed, HSG C 1.083 57 Oak/aspen range, Fair, HSG C 0.093 98 Paved parking, HSG C 5.937 69 Weighted Average 5.844 98.43% Pervious Area 0.093 1.57% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.5 203 0.1711 0.20 Sheet Flow, Grass Meadow Grass: Dense n= 0.240 P2= 1.33" 5.2 658 0.0917 2.12 Shallow Concentrated Flow, Grass Meadow Short Grass Pasture Kv= 7.0 fps 21.7 861 Total Subcatchment 39S: PRE-AREA-01 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)2 1 0 Type II 24-hr 25-YR Rainfall=2.21" Ia/S=0.15 Runoff Area=5.937 ac Runoff Volume=0.194 af Runoff Depth=0.39" Flow Length=861' Tc=21.7 min CN=69 2.00 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 8HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 39S: PRE-AREA-01 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.14 0.00 0.00 5.30 0.15 0.00 0.00 5.60 0.16 0.00 0.00 5.90 0.17 0.00 0.00 6.20 0.18 0.00 0.00 6.50 0.20 0.00 0.00 6.80 0.21 0.00 0.00 7.10 0.22 0.00 0.00 7.40 0.24 0.00 0.00 7.70 0.25 0.00 0.00 8.00 0.27 0.00 0.00 8.30 0.28 0.00 0.00 8.60 0.30 0.00 0.00 8.90 0.32 0.00 0.00 9.20 0.34 0.00 0.00 9.50 0.36 0.00 0.00 9.80 0.38 0.00 0.00 10.10 0.41 0.00 0.00 10.40 0.44 0.00 0.00 10.70 0.48 0.00 0.00 11.00 0.52 0.00 0.00 11.30 0.58 0.00 0.00 11.60 0.68 0.00 0.00 11.90 1.25 0.07 0.20 12.20 1.54 0.14 1.98 12.50 1.62 0.17 0.84 12.80 1.68 0.18 0.45 13.10 1.72 0.20 0.33 13.40 1.76 0.21 0.27 13.70 1.79 0.22 0.24 14.00 1.81 0.23 0.21 14.30 1.84 0.24 0.18 14.60 1.86 0.25 0.17 14.90 1.88 0.26 0.16 15.20 1.90 0.26 0.15 15.50 1.92 0.27 0.15 15.80 1.93 0.28 0.14 16.10 1.95 0.28 0.13 16.40 1.96 0.29 0.12 16.70 1.98 0.29 0.12 17.00 1.99 0.30 0.11 17.30 2.01 0.30 0.11 17.60 2.02 0.31 0.11 17.90 2.03 0.31 0.10 18.20 2.04 0.32 0.10 18.50 2.05 0.32 0.10 18.80 2.07 0.33 0.09 19.10 2.08 0.33 0.09 19.40 2.09 0.34 0.08 19.70 2.10 0.34 0.08 20.00 2.10 0.35 0.08 20.30 2.11 0.35 0.07 20.60 2.12 0.35 0.07 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.13 0.36 0.07 21.20 2.14 0.36 0.07 21.50 2.15 0.36 0.07 21.80 2.15 0.37 0.07 22.10 2.16 0.37 0.07 22.40 2.17 0.37 0.07 22.70 2.18 0.38 0.07 23.00 2.19 0.38 0.07 23.30 2.19 0.38 0.07 23.60 2.20 0.39 0.07 23.90 2.21 0.39 0.07 24.20 2.21 0.39 0.05 24.50 2.21 0.39 0.01 24.80 2.21 0.39 0.00 25.10 2.21 0.39 0.00 25.40 2.21 0.39 0.00 25.70 2.21 0.39 0.00 26.00 2.21 0.39 0.00 26.30 2.21 0.39 0.00 26.60 2.21 0.39 0.00 26.90 2.21 0.39 0.00 27.20 2.21 0.39 0.00 27.50 2.21 0.39 0.00 27.80 2.21 0.39 0.00 28.10 2.21 0.39 0.00 28.40 2.21 0.39 0.00 28.70 2.21 0.39 0.00 29.00 2.21 0.39 0.00 29.30 2.21 0.39 0.00 29.60 2.21 0.39 0.00 29.90 2.21 0.39 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 9HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Time span=5.00-30.00 hrs, dt=0.03 hrs, 834 points x 3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=5.937 ac 1.57% Impervious Runoff Depth=0.69"Subcatchment 39S: PRE-AREA-01 Flow Length=861' Tc=21.7 min CN=69 Runoff=3.89 cfs 0.341 af Total Runoff Area = 5.937 ac Runoff Volume = 0.341 af Average Runoff Depth = 0.69" 98.43% Pervious = 5.844 ac 1.57% Impervious = 0.093 ac Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 10HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 39S: PRE-AREA-01 Runoff = 3.89 cfs @ 12.17 hrs, Volume= 0.341 af, Depth= 0.69" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.15 Area (ac) CN Description 4.761 71 Meadow, non-grazed, HSG C 1.083 57 Oak/aspen range, Fair, HSG C 0.093 98 Paved parking, HSG C 5.937 69 Weighted Average 5.844 98.43% Pervious Area 0.093 1.57% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.5 203 0.1711 0.20 Sheet Flow, Grass Meadow Grass: Dense n= 0.240 P2= 1.33" 5.2 658 0.0917 2.12 Shallow Concentrated Flow, Grass Meadow Short Grass Pasture Kv= 7.0 fps 21.7 861 Total Subcatchment 39S: PRE-AREA-01 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)4 3 2 1 0 Type II 24-hr 100-YR Rainfall=2.81" Ia/S=0.15 Runoff Area=5.937 ac Runoff Volume=0.341 af Runoff Depth=0.69" Flow Length=861' Tc=21.7 min CN=69 3.89 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 11HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 39S: PRE-AREA-01 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.18 0.00 0.00 5.30 0.19 0.00 0.00 5.60 0.21 0.00 0.00 5.90 0.22 0.00 0.00 6.20 0.24 0.00 0.00 6.50 0.25 0.00 0.00 6.80 0.27 0.00 0.00 7.10 0.28 0.00 0.00 7.40 0.30 0.00 0.00 7.70 0.32 0.00 0.00 8.00 0.34 0.00 0.00 8.30 0.36 0.00 0.00 8.60 0.38 0.00 0.00 8.90 0.40 0.00 0.00 9.20 0.43 0.00 0.00 9.50 0.46 0.00 0.00 9.80 0.49 0.00 0.00 10.10 0.52 0.00 0.00 10.40 0.56 0.00 0.00 10.70 0.60 0.00 0.00 11.00 0.66 0.00 0.00 11.30 0.73 0.00 0.00 11.60 0.86 0.01 0.04 11.90 1.60 0.16 0.74 12.20 1.96 0.29 3.79 12.50 2.07 0.33 1.48 12.80 2.13 0.36 0.76 13.10 2.19 0.38 0.54 13.40 2.23 0.40 0.44 13.70 2.27 0.42 0.38 14.00 2.30 0.43 0.34 14.30 2.33 0.45 0.30 14.60 2.36 0.46 0.28 14.90 2.39 0.47 0.26 15.20 2.41 0.49 0.25 15.50 2.44 0.50 0.23 15.80 2.46 0.51 0.22 16.10 2.48 0.52 0.20 16.40 2.50 0.53 0.19 16.70 2.52 0.54 0.18 17.00 2.53 0.54 0.18 17.30 2.55 0.55 0.17 17.60 2.57 0.56 0.17 17.90 2.58 0.57 0.16 18.20 2.60 0.58 0.16 18.50 2.61 0.58 0.15 18.80 2.63 0.59 0.14 19.10 2.64 0.60 0.14 19.40 2.65 0.60 0.13 19.70 2.66 0.61 0.13 20.00 2.68 0.62 0.12 20.30 2.69 0.62 0.12 20.60 2.70 0.63 0.11 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.71 0.63 0.11 21.20 2.72 0.64 0.11 21.50 2.73 0.64 0.11 21.80 2.74 0.65 0.11 22.10 2.75 0.66 0.11 22.40 2.76 0.66 0.11 22.70 2.77 0.67 0.11 23.00 2.78 0.67 0.10 23.30 2.79 0.68 0.10 23.60 2.80 0.68 0.10 23.90 2.81 0.69 0.10 24.20 2.81 0.69 0.08 24.50 2.81 0.69 0.01 24.80 2.81 0.69 0.00 25.10 2.81 0.69 0.00 25.40 2.81 0.69 0.00 25.70 2.81 0.69 0.00 26.00 2.81 0.69 0.00 26.30 2.81 0.69 0.00 26.60 2.81 0.69 0.00 26.90 2.81 0.69 0.00 27.20 2.81 0.69 0.00 27.50 2.81 0.69 0.00 27.80 2.81 0.69 0.00 28.10 2.81 0.69 0.00 28.40 2.81 0.69 0.00 28.70 2.81 0.69 0.00 29.00 2.81 0.69 0.00 29.30 2.81 0.69 0.00 29.60 2.81 0.69 0.00 29.90 2.81 0.69 0.00 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 12HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment 39S: PRE-AREA-01 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 25-YR 2.21 2.00 0.194 0.39 100-YR 2.81 3.89 0.341 0.69 Table of Contents03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC TABLE OF CONTENTS Project Reports 1 Routing Diagram 2 Rainfall Events Listing (selected events) 3 Area Listing (selected nodes) 4 Soil Listing (selected nodes) 5 Ground Covers (selected nodes) 25-YR Event 6 Node Listing 7 Subcat 39S: PRE-AREA-01 100-YR Event 9 Node Listing 10 Subcat 39S: PRE-AREA-01 Multi-Event Tables 12 Subcat 39S: PRE-AREA-01 APPENDIX A3 Pre-Development 25-Year and 100-Year Hydrologic Analysis For Tributary Area-02 38S PRE-AREA-02 Routing Diagram for 03385-2020-20210713 Prepared by Gamba Engineering, Printed 7/14/2021 HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcat Reach Pond Link 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 2HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 25-YR Type II 24-hr Default 24.00 1 2.21 2 2 100-YR Type II 24-hr Default 24.00 1 2.81 2 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 3HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 3.954 71 Meadow, non-grazed, HSG C (38S) 3.954 71 TOTAL AREA 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 4HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Soil Listing (selected nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 3.954 HSG C 38S 0.000 HSG D 0.000 Other 3.954 TOTAL AREA 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 5HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Ground Covers (selected nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 3.954 0.000 0.000 3.954 Meadow, non-grazed 38S 0.000 0.000 3.954 0.000 0.000 3.954 TOTAL AREA Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 6HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Time span=5.00-30.00 hrs, dt=0.03 hrs, 834 points x 3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=3.954 ac 0.00% Impervious Runoff Depth=0.45"Subcatchment 38S: PRE-AREA-02 Flow Length=788' Tc=22.6 min CN=71 Runoff=1.56 cfs 0.148 af Total Runoff Area = 3.954 ac Runoff Volume = 0.148 af Average Runoff Depth = 0.45" 100.00% Pervious = 3.954 ac 0.00% Impervious = 0.000 ac Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 7HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 38S: PRE-AREA-02 Runoff = 1.56 cfs @ 12.18 hrs, Volume= 0.148 af, Depth= 0.45" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.15 Area (ac) CN Description 3.954 71 Meadow, non-grazed, HSG C 3.954 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.4 201 0.1289 0.18 Sheet Flow, Grass Meadows Grass: Dense n= 0.240 P2= 1.33" 4.2 587 0.1132 2.36 Shallow Concentrated Flow, Grass Meadow Short Grass Pasture Kv= 7.0 fps 22.6 788 Total Subcatchment 38S: PRE-AREA-02 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Type II 24-hr 25-YR Rainfall=2.21" Ia/S=0.15 Runoff Area=3.954 ac Runoff Volume=0.148 af Runoff Depth=0.45" Flow Length=788' Tc=22.6 min CN=71 1.56 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 8HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 38S: PRE-AREA-02 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.14 0.00 0.00 5.30 0.15 0.00 0.00 5.60 0.16 0.00 0.00 5.90 0.17 0.00 0.00 6.20 0.18 0.00 0.00 6.50 0.20 0.00 0.00 6.80 0.21 0.00 0.00 7.10 0.22 0.00 0.00 7.40 0.24 0.00 0.00 7.70 0.25 0.00 0.00 8.00 0.27 0.00 0.00 8.30 0.28 0.00 0.00 8.60 0.30 0.00 0.00 8.90 0.32 0.00 0.00 9.20 0.34 0.00 0.00 9.50 0.36 0.00 0.00 9.80 0.38 0.00 0.00 10.10 0.41 0.00 0.00 10.40 0.44 0.00 0.00 10.70 0.48 0.00 0.00 11.00 0.52 0.00 0.00 11.30 0.58 0.00 0.00 11.60 0.68 0.00 0.00 11.90 1.25 0.09 0.20 12.20 1.54 0.17 1.55 12.50 1.62 0.20 0.67 12.80 1.68 0.22 0.35 13.10 1.72 0.24 0.25 13.40 1.76 0.25 0.20 13.70 1.79 0.26 0.18 14.00 1.81 0.27 0.15 14.30 1.84 0.28 0.14 14.60 1.86 0.29 0.13 14.90 1.88 0.30 0.12 15.20 1.90 0.31 0.11 15.50 1.92 0.32 0.11 15.80 1.93 0.32 0.10 16.10 1.95 0.33 0.09 16.40 1.96 0.34 0.09 16.70 1.98 0.34 0.08 17.00 1.99 0.35 0.08 17.30 2.01 0.35 0.08 17.60 2.02 0.36 0.08 17.90 2.03 0.37 0.08 18.20 2.04 0.37 0.07 18.50 2.05 0.38 0.07 18.80 2.07 0.38 0.07 19.10 2.08 0.39 0.06 19.40 2.09 0.39 0.06 19.70 2.10 0.39 0.06 20.00 2.10 0.40 0.06 20.30 2.11 0.40 0.05 20.60 2.12 0.41 0.05 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.13 0.41 0.05 21.20 2.14 0.41 0.05 21.50 2.15 0.42 0.05 21.80 2.15 0.42 0.05 22.10 2.16 0.43 0.05 22.40 2.17 0.43 0.05 22.70 2.18 0.43 0.05 23.00 2.19 0.44 0.05 23.30 2.19 0.44 0.05 23.60 2.20 0.44 0.05 23.90 2.21 0.45 0.05 24.20 2.21 0.45 0.04 24.50 2.21 0.45 0.01 24.80 2.21 0.45 0.00 25.10 2.21 0.45 0.00 25.40 2.21 0.45 0.00 25.70 2.21 0.45 0.00 26.00 2.21 0.45 0.00 26.30 2.21 0.45 0.00 26.60 2.21 0.45 0.00 26.90 2.21 0.45 0.00 27.20 2.21 0.45 0.00 27.50 2.21 0.45 0.00 27.80 2.21 0.45 0.00 28.10 2.21 0.45 0.00 28.40 2.21 0.45 0.00 28.70 2.21 0.45 0.00 29.00 2.21 0.45 0.00 29.30 2.21 0.45 0.00 29.60 2.21 0.45 0.00 29.90 2.21 0.45 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 9HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Time span=5.00-30.00 hrs, dt=0.03 hrs, 834 points x 3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=3.954 ac 0.00% Impervious Runoff Depth=0.77"Subcatchment 38S: PRE-AREA-02 Flow Length=788' Tc=22.6 min CN=71 Runoff=2.89 cfs 0.253 af Total Runoff Area = 3.954 ac Runoff Volume = 0.253 af Average Runoff Depth = 0.77" 100.00% Pervious = 3.954 ac 0.00% Impervious = 0.000 ac Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 10HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 38S: PRE-AREA-02 Runoff = 2.89 cfs @ 12.17 hrs, Volume= 0.253 af, Depth= 0.77" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.15 Area (ac) CN Description 3.954 71 Meadow, non-grazed, HSG C 3.954 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.4 201 0.1289 0.18 Sheet Flow, Grass Meadows Grass: Dense n= 0.240 P2= 1.33" 4.2 587 0.1132 2.36 Shallow Concentrated Flow, Grass Meadow Short Grass Pasture Kv= 7.0 fps 22.6 788 Total Subcatchment 38S: PRE-AREA-02 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)3 2 1 0 Type II 24-hr 100-YR Rainfall=2.81" Ia/S=0.15 Runoff Area=3.954 ac Runoff Volume=0.253 af Runoff Depth=0.77" Flow Length=788' Tc=22.6 min CN=71 2.89 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 11HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 38S: PRE-AREA-02 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.18 0.00 0.00 5.30 0.19 0.00 0.00 5.60 0.21 0.00 0.00 5.90 0.22 0.00 0.00 6.20 0.24 0.00 0.00 6.50 0.25 0.00 0.00 6.80 0.27 0.00 0.00 7.10 0.28 0.00 0.00 7.40 0.30 0.00 0.00 7.70 0.32 0.00 0.00 8.00 0.34 0.00 0.00 8.30 0.36 0.00 0.00 8.60 0.38 0.00 0.00 8.90 0.40 0.00 0.00 9.20 0.43 0.00 0.00 9.50 0.46 0.00 0.00 9.80 0.49 0.00 0.00 10.10 0.52 0.00 0.00 10.40 0.56 0.00 0.00 10.70 0.60 0.00 0.00 11.00 0.66 0.00 0.00 11.30 0.73 0.00 0.02 11.60 0.86 0.01 0.06 11.90 1.60 0.19 0.59 12.20 1.96 0.34 2.84 12.50 2.07 0.38 1.15 12.80 2.13 0.41 0.58 13.10 2.19 0.44 0.40 13.40 2.23 0.46 0.32 13.70 2.27 0.48 0.28 14.00 2.30 0.50 0.24 14.30 2.33 0.51 0.22 14.60 2.36 0.53 0.20 14.90 2.39 0.54 0.19 15.20 2.41 0.55 0.18 15.50 2.44 0.56 0.17 15.80 2.46 0.58 0.16 16.10 2.48 0.59 0.15 16.40 2.50 0.60 0.14 16.70 2.52 0.61 0.13 17.00 2.53 0.61 0.13 17.30 2.55 0.62 0.12 17.60 2.57 0.63 0.12 17.90 2.58 0.64 0.12 18.20 2.60 0.65 0.11 18.50 2.61 0.66 0.11 18.80 2.63 0.66 0.10 19.10 2.64 0.67 0.10 19.40 2.65 0.68 0.10 19.70 2.66 0.69 0.09 20.00 2.68 0.69 0.09 20.30 2.69 0.70 0.08 20.60 2.70 0.70 0.08 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.71 0.71 0.08 21.20 2.72 0.72 0.08 21.50 2.73 0.72 0.08 21.80 2.74 0.73 0.08 22.10 2.75 0.73 0.08 22.40 2.76 0.74 0.08 22.70 2.77 0.74 0.08 23.00 2.78 0.75 0.07 23.30 2.79 0.76 0.07 23.60 2.80 0.76 0.07 23.90 2.81 0.77 0.07 24.20 2.81 0.77 0.06 24.50 2.81 0.77 0.01 24.80 2.81 0.77 0.00 25.10 2.81 0.77 0.00 25.40 2.81 0.77 0.00 25.70 2.81 0.77 0.00 26.00 2.81 0.77 0.00 26.30 2.81 0.77 0.00 26.60 2.81 0.77 0.00 26.90 2.81 0.77 0.00 27.20 2.81 0.77 0.00 27.50 2.81 0.77 0.00 27.80 2.81 0.77 0.00 28.10 2.81 0.77 0.00 28.40 2.81 0.77 0.00 28.70 2.81 0.77 0.00 29.00 2.81 0.77 0.00 29.30 2.81 0.77 0.00 29.60 2.81 0.77 0.00 29.90 2.81 0.77 0.00 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 12HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment 38S: PRE-AREA-02 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 25-YR 2.21 1.56 0.148 0.45 100-YR 2.81 2.89 0.253 0.77 Table of Contents03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC TABLE OF CONTENTS Project Reports 1 Routing Diagram 2 Rainfall Events Listing (selected events) 3 Area Listing (selected nodes) 4 Soil Listing (selected nodes) 5 Ground Covers (selected nodes) 25-YR Event 6 Node Listing 7 Subcat 38S: PRE-AREA-02 100-YR Event 9 Node Listing 10 Subcat 38S: PRE-AREA-02 Multi-Event Tables 12 Subcat 38S: PRE-AREA-02 APPENDIX A4 Pre-Development 25-Year and 100-Year Hydrologic Analysis For Tributary Area-03 33S PRE-AREA-10 34S PRE-AREA-03 35R Reach 03 36R Reach-10A 37R Reach-10B 12PCB PRE-AREA-10-CULVERT Routing Diagram for 03385-2020-20210713 Prepared by Gamba Engineering, Printed 7/14/2021 HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcat Reach Pond Link 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 2HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 25-YR Type II 24-hr Default 24.00 1 2.21 2 2 100-YR Type II 24-hr Default 24.00 1 2.81 2 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 3HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 0.592 81 1/3 acre lots, 30% imp, HSG C (33S) 0.105 87 Dirt roads, HSG C (33S) 3.074 71 Meadow, non-grazed, HSG C (33S, 34S) 0.678 57 Oak/aspen range, Fair, HSG C (33S, 34S) 0.289 98 Paved parking, HSG C (33S, 34S) 4.738 72 TOTAL AREA 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 4HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Soil Listing (selected nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 4.738 HSG C 33S, 34S 0.000 HSG D 0.000 Other 4.738 TOTAL AREA 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 5HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Ground Covers (selected nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.592 0.000 0.000 0.592 1/3 acre lots, 30% imp 33S 0.000 0.000 0.105 0.000 0.000 0.105 Dirt roads 33S 0.000 0.000 3.074 0.000 0.000 3.074 Meadow, non-grazed 33S, 34S 0.000 0.000 0.678 0.000 0.000 0.678 Oak/aspen range, Fair 33S, 34S 0.000 0.000 0.289 0.000 0.000 0.289 Paved parking 33S, 34S 0.000 0.000 4.738 0.000 0.000 4.738 TOTAL AREA 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 6HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Pipe Listing (selected nodes) Line# Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) n Width (inches) Diam/Height (inches) Inside-Fill (inches) 1 12P 6,880.73 6,879.51 38.8 0.0314 0.012 0.0 12.0 9.0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 7HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Time span=5.00-30.00 hrs, dt=0.03 hrs, 834 points x 3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2.069 ac 12.55% Impervious Runoff Depth=0.55"Subcatchment 33S: PRE-AREA-10 Flow Length=473' Tc=25.6 min CN=74 Runoff=0.96 cfs 0.094 af Runoff Area=2.669 ac 7.76% Impervious Runoff Depth=0.45"Subcatchment 34S: PRE-AREA-03 Flow Length=839' Tc=18.1 min CN=71 Runoff=1.22 cfs 0.100 af Avg. Flow Depth=0.13' Max Vel=2.87 fps Inflow=1.97 cfs 0.194 afReach 35R: Reach 03 n=0.035 L=92.4' S=0.0937 '/' Capacity=4.40 cfs Outflow=1.97 cfs 0.194 af Avg. Flow Depth=0.04' Max Vel=1.70 fps Inflow=0.44 cfs 0.081 afReach 36R: Reach-10A n=0.030 L=243.6' S=0.1065 '/' Capacity=81.56 cfs Outflow=0.44 cfs 0.081 af Avg. Flow Depth=0.21' Max Vel=3.06 fps Inflow=0.96 cfs 0.094 afReach 37R: Reach-10B n=0.030 L=565.8' S=0.0778 '/' Capacity=58.35 cfs Outflow=0.94 cfs 0.094 af Peak Elev=6,882.15' Inflow=0.96 cfs 0.094 afPond 12P: PRE-AREA-10-CULVERT Primary=0.44 cfs 0.081 af Secondary=0.53 cfs 0.013 af Outflow=0.96 cfs 0.094 af Total Runoff Area = 4.738 ac Runoff Volume = 0.194 af Average Runoff Depth = 0.49" 90.15% Pervious = 4.271 ac 9.85% Impervious = 0.467 ac Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 8HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 33S: PRE-AREA-10 [47] Hint: Peak is 1380% of capacity of segment #3 [47] Hint: Peak is 615% of capacity of segment #4 [47] Hint: Peak is 210% of capacity of segment #5 Runoff = 0.96 cfs @ 12.21 hrs, Volume= 0.094 af, Depth= 0.55" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.15 Area (ac) CN Description 0.592 81 1/3 acre lots, 30% imp, HSG C 0.986 71 Meadow, non-grazed, HSG C 0.304 57 Oak/aspen range, Fair, HSG C 0.105 87 Dirt roads, HSG C 0.082 98 Paved parking, HSG C 2.069 74 Weighted Average 1.809 87.45% Pervious Area 0.260 12.55% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 22.9 200 0.2046 0.15 Sheet Flow, Oak Brush - Meadow Woods: Light underbrush n= 0.400 P2= 1.33" 0.3 45 0.3536 2.97 Shallow Concentrated Flow, Oak Brush - Meadow Woodland Kv= 5.0 fps 1.1 64 0.0144 1.00 0.07 Trap/Vee/Rect Channel Flow, Old Irrigation Ditch Bot.W=0.00' D=0.20' Z= 1.9 & 1.6 '/' Top.W=0.70' n= 0.035 Earth, dense weeds 0.7 64 0.2359 1.57 0.16 Trap/Vee/Rect Channel Flow, Slope through Oak Brush - Meado Bot.W=4.00' D=0.02' Z= 50.0 '/' Top.W=6.00' n= 0.030 Earth, grassed & winding 0.6 100 0.0624 2.94 0.46 Trap/Vee/Rect Channel Flow, Roadside Ditch Bot.W=0.00' D=0.25' Z= 2.5 '/' Top.W=1.25' n= 0.030 Earth, grassed & winding 25.6 473 Total Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 9HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcatchment 33S: PRE-AREA-10 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Type II 24-hr 25-YR Rainfall=2.21" Ia/S=0.15 Runoff Area=2.069 ac Runoff Volume=0.094 af Runoff Depth=0.55" Flow Length=473' Tc=25.6 min CN=74 0.96 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 10HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 33S: PRE-AREA-10 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.14 0.00 0.00 5.30 0.15 0.00 0.00 5.60 0.16 0.00 0.00 5.90 0.17 0.00 0.00 6.20 0.18 0.00 0.00 6.50 0.20 0.00 0.00 6.80 0.21 0.00 0.00 7.10 0.22 0.00 0.00 7.40 0.24 0.00 0.00 7.70 0.25 0.00 0.00 8.00 0.27 0.00 0.00 8.30 0.28 0.00 0.00 8.60 0.30 0.00 0.00 8.90 0.32 0.00 0.00 9.20 0.34 0.00 0.00 9.50 0.36 0.00 0.00 9.80 0.38 0.00 0.00 10.10 0.41 0.00 0.00 10.40 0.44 0.00 0.00 10.70 0.48 0.00 0.00 11.00 0.52 0.00 0.00 11.30 0.58 0.00 0.00 11.60 0.68 0.01 0.01 11.90 1.25 0.12 0.15 12.20 1.54 0.23 0.96 12.50 1.62 0.26 0.49 12.80 1.68 0.28 0.24 13.10 1.72 0.30 0.16 13.40 1.76 0.32 0.13 13.70 1.79 0.33 0.11 14.00 1.81 0.34 0.09 14.30 1.84 0.36 0.08 14.60 1.86 0.37 0.08 14.90 1.88 0.38 0.07 15.20 1.90 0.39 0.07 15.50 1.92 0.39 0.06 15.80 1.93 0.40 0.06 16.10 1.95 0.41 0.06 16.40 1.96 0.42 0.05 16.70 1.98 0.42 0.05 17.00 1.99 0.43 0.05 17.30 2.01 0.44 0.05 17.60 2.02 0.44 0.05 17.90 2.03 0.45 0.04 18.20 2.04 0.46 0.04 18.50 2.05 0.46 0.04 18.80 2.07 0.47 0.04 19.10 2.08 0.47 0.04 19.40 2.09 0.48 0.04 19.70 2.10 0.48 0.04 20.00 2.10 0.49 0.03 20.30 2.11 0.49 0.03 20.60 2.12 0.50 0.03 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.13 0.50 0.03 21.20 2.14 0.51 0.03 21.50 2.15 0.51 0.03 21.80 2.15 0.51 0.03 22.10 2.16 0.52 0.03 22.40 2.17 0.52 0.03 22.70 2.18 0.53 0.03 23.00 2.19 0.53 0.03 23.30 2.19 0.54 0.03 23.60 2.20 0.54 0.03 23.90 2.21 0.54 0.03 24.20 2.21 0.55 0.02 24.50 2.21 0.55 0.01 24.80 2.21 0.55 0.00 25.10 2.21 0.55 0.00 25.40 2.21 0.55 0.00 25.70 2.21 0.55 0.00 26.00 2.21 0.55 0.00 26.30 2.21 0.55 0.00 26.60 2.21 0.55 0.00 26.90 2.21 0.55 0.00 27.20 2.21 0.55 0.00 27.50 2.21 0.55 0.00 27.80 2.21 0.55 0.00 28.10 2.21 0.55 0.00 28.40 2.21 0.55 0.00 28.70 2.21 0.55 0.00 29.00 2.21 0.55 0.00 29.30 2.21 0.55 0.00 29.60 2.21 0.55 0.00 29.90 2.21 0.55 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 11HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 34S: PRE-AREA-03 Runoff = 1.22 cfs @ 12.13 hrs, Volume= 0.100 af, Depth= 0.45" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.15 Area (ac) CN Description 2.088 71 Meadow, non-grazed, HSG C 0.374 57 Oak/aspen range, Fair, HSG C 0.207 98 Paved parking, HSG C 2.669 71 Weighted Average 2.462 92.24% Pervious Area 0.207 7.76% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.8 75 0.0902 1.53 Sheet Flow, Driveway Pavement Smooth surfaces n= 0.011 P2= 1.33" 11.7 126 0.1558 0.18 Sheet Flow, Grass Meadow Grass: Dense n= 0.240 P2= 1.33" 5.3 506 0.1005 1.59 Shallow Concentrated Flow, Grass Meadow Woodland Kv= 5.0 fps 0.3 132 0.0766 8.46 39.77 Trap/Vee/Rect Channel Flow, Roadside Ditch Bot.W=0.00' D=1.00' Z= 2.1 & 7.3 '/' Top.W=9.40' n= 0.030 Earth, grassed & winding 18.1 839 Total Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 12HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcatchment 34S: PRE-AREA-03 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Type II 24-hr 25-YR Rainfall=2.21" Ia/S=0.15 Runoff Area=2.669 ac Runoff Volume=0.100 af Runoff Depth=0.45" Flow Length=839' Tc=18.1 min CN=71 1.22 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 13HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 34S: PRE-AREA-03 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.14 0.00 0.00 5.30 0.15 0.00 0.00 5.60 0.16 0.00 0.00 5.90 0.17 0.00 0.00 6.20 0.18 0.00 0.00 6.50 0.20 0.00 0.00 6.80 0.21 0.00 0.00 7.10 0.22 0.00 0.00 7.40 0.24 0.00 0.00 7.70 0.25 0.00 0.00 8.00 0.27 0.00 0.00 8.30 0.28 0.00 0.00 8.60 0.30 0.00 0.00 8.90 0.32 0.00 0.00 9.20 0.34 0.00 0.00 9.50 0.36 0.00 0.00 9.80 0.38 0.00 0.00 10.10 0.41 0.00 0.00 10.40 0.44 0.00 0.00 10.70 0.48 0.00 0.00 11.00 0.52 0.00 0.00 11.30 0.58 0.00 0.00 11.60 0.68 0.00 0.00 11.90 1.25 0.09 0.23 12.20 1.54 0.17 1.06 12.50 1.62 0.20 0.36 12.80 1.68 0.22 0.20 13.10 1.72 0.24 0.16 13.40 1.76 0.25 0.13 13.70 1.79 0.26 0.11 14.00 1.81 0.27 0.10 14.30 1.84 0.28 0.09 14.60 1.86 0.29 0.08 14.90 1.88 0.30 0.08 15.20 1.90 0.31 0.08 15.50 1.92 0.32 0.07 15.80 1.93 0.32 0.07 16.10 1.95 0.33 0.06 16.40 1.96 0.34 0.06 16.70 1.98 0.34 0.06 17.00 1.99 0.35 0.06 17.30 2.01 0.35 0.05 17.60 2.02 0.36 0.05 17.90 2.03 0.37 0.05 18.20 2.04 0.37 0.05 18.50 2.05 0.38 0.05 18.80 2.07 0.38 0.05 19.10 2.08 0.39 0.04 19.40 2.09 0.39 0.04 19.70 2.10 0.39 0.04 20.00 2.10 0.40 0.04 20.30 2.11 0.40 0.04 20.60 2.12 0.41 0.04 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.13 0.41 0.04 21.20 2.14 0.41 0.03 21.50 2.15 0.42 0.03 21.80 2.15 0.42 0.03 22.10 2.16 0.43 0.03 22.40 2.17 0.43 0.03 22.70 2.18 0.43 0.03 23.00 2.19 0.44 0.03 23.30 2.19 0.44 0.03 23.60 2.20 0.44 0.03 23.90 2.21 0.45 0.03 24.20 2.21 0.45 0.02 24.50 2.21 0.45 0.00 24.80 2.21 0.45 0.00 25.10 2.21 0.45 0.00 25.40 2.21 0.45 0.00 25.70 2.21 0.45 0.00 26.00 2.21 0.45 0.00 26.30 2.21 0.45 0.00 26.60 2.21 0.45 0.00 26.90 2.21 0.45 0.00 27.20 2.21 0.45 0.00 27.50 2.21 0.45 0.00 27.80 2.21 0.45 0.00 28.10 2.21 0.45 0.00 28.40 2.21 0.45 0.00 28.70 2.21 0.45 0.00 29.00 2.21 0.45 0.00 29.30 2.21 0.45 0.00 29.60 2.21 0.45 0.00 29.90 2.21 0.45 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 14HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 35R: Reach 03 [61] Hint: Exceeded Reach 37R outlet invert by 0.13' @ 12.17 hrs Inflow Area = 4.738 ac, 9.85% Impervious, Inflow Depth = 0.49" for 25-YR event Inflow = 1.97 cfs @ 12.18 hrs, Volume= 0.194 af Outflow = 1.97 cfs @ 12.18 hrs, Volume= 0.194 af, Atten= 0%, Lag= 0.4 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 2.87 fps, Min. Travel Time= 0.5 min Avg. Velocity = 0.97 fps, Avg. Travel Time= 1.6 min Peak Storage= 63 cf @ 12.18 hrs Average Depth at Peak Storage= 0.13' , Surface Width= 6.59' Bank-Full Depth= 0.20' Flow Area= 1.2 sf, Capacity= 4.40 cfs 4.00' x 0.20' deep channel, n= 0.035 Earth, dense weeds Side Slope Z-value= 10.0 '/' Top Width= 8.00' Length= 92.4' Slope= 0.0937 '/' Inlet Invert= 6,810.65', Outlet Invert= 6,801.99' ‡ Reach 35R: Reach 03 Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)2 1 0 Inflow Area=4.738 ac Avg. Flow Depth=0.13' Max Vel=2.87 fps n=0.035 L=92.4' S=0.0937 '/' Capacity=4.40 cfs 1.97 cfs1.97 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 15HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 35R: Reach 03 Primary Stage-Discharge Discharge (cfs) 43210Depth (feet)0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Reach 35R: Reach 03 Storage Stage-Storage Storage (cubic-feet) 1101009080706050403020100Depth (feet)0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 16HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 35R: Reach 03 Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,810.65 0.00 5.60 0.00 0 6,810.65 0.00 6.20 0.00 0 6,810.65 0.00 6.80 0.00 0 6,810.65 0.00 7.40 0.00 0 6,810.65 0.00 8.00 0.00 0 6,810.65 0.00 8.60 0.00 0 6,810.65 0.00 9.20 0.00 0 6,810.65 0.00 9.80 0.00 0 6,810.65 0.00 10.40 0.00 0 6,810.65 0.00 11.00 0.00 0 6,810.65 0.00 11.60 0.00 0 6,810.65 0.00 12.20 1.95 63 6,810.78 1.96 12.80 0.49 25 6,810.71 0.50 13.40 0.27 17 6,810.69 0.27 14.00 0.20 14 6,810.69 0.20 14.60 0.16 12 6,810.68 0.16 15.20 0.15 12 6,810.68 0.15 15.80 0.13 11 6,810.68 0.13 16.40 0.11 10 6,810.67 0.11 17.00 0.11 9 6,810.67 0.11 17.60 0.10 9 6,810.67 0.10 18.20 0.09 9 6,810.67 0.09 18.80 0.09 8 6,810.67 0.09 19.40 0.08 8 6,810.67 0.08 20.00 0.07 7 6,810.67 0.07 20.60 0.07 7 6,810.67 0.07 21.20 0.07 7 6,810.67 0.07 21.80 0.06 7 6,810.67 0.06 22.40 0.06 7 6,810.67 0.06 23.00 0.06 7 6,810.67 0.06 23.60 0.06 7 6,810.67 0.06 24.20 0.05 6 6,810.67 0.05 24.80 0.01 2 6,810.65 0.01 25.40 0.00 1 6,810.65 0.00 26.00 0.00 0 6,810.65 0.00 26.60 0.00 0 6,810.65 0.00 27.20 0.00 0 6,810.65 0.00 27.80 0.00 0 6,810.65 0.00 28.40 0.00 0 6,810.65 0.00 29.00 0.00 0 6,810.65 0.00 29.60 0.00 0 6,810.65 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 17HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 35R: Reach 03 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,810.65 0.00 0.00 6,810.66 0.59 0.02 6,810.67 0.93 0.08 6,810.68 1.20 0.15 6,810.69 1.43 0.25 6,810.70 1.64 0.37 6,810.71 1.83 0.51 6,810.72 2.01 0.66 6,810.73 2.18 0.84 6,810.74 2.33 1.03 6,810.75 2.48 1.24 6,810.76 2.62 1.47 6,810.77 2.75 1.72 6,810.78 2.88 1.98 6,810.79 3.00 2.27 6,810.80 3.12 2.57 6,810.81 3.24 2.90 6,810.82 3.35 3.24 6,810.83 3.46 3.61 6,810.84 3.56 3.99 6,810.85 3.66 4.40 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 18HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 35R: Reach 03 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,810.65 0.0 0 6,810.66 0.0 4 6,810.67 0.1 8 6,810.68 0.1 12 6,810.69 0.2 16 6,810.70 0.2 21 6,810.71 0.3 26 6,810.72 0.3 30 6,810.73 0.4 35 6,810.74 0.4 41 6,810.75 0.5 46 6,810.76 0.6 52 6,810.77 0.6 58 6,810.78 0.7 64 6,810.79 0.8 70 6,810.80 0.8 76 6,810.81 0.9 83 6,810.82 1.0 90 6,810.83 1.0 96 6,810.84 1.1 104 6,810.85 1.2 111 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 19HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 36R: Reach-10A Inflow Area = 2.069 ac, 12.55% Impervious, Inflow Depth = 0.47" for 25-YR event Inflow = 0.44 cfs @ 12.21 hrs, Volume= 0.081 af Outflow = 0.44 cfs @ 12.25 hrs, Volume= 0.081 af, Atten= 0%, Lag= 2.0 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 1.70 fps, Min. Travel Time= 2.4 min Avg. Velocity = 0.84 fps, Avg. Travel Time= 4.8 min Peak Storage= 63 cf @ 12.25 hrs Average Depth at Peak Storage= 0.04' , Surface Width= 7.56' Bank-Full Depth= 0.50' Flow Area= 12.0 sf, Capacity= 81.56 cfs 4.00' x 0.50' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 40.0 '/' Top Width= 44.00' Length= 243.6' Slope= 0.1065 '/' Inlet Invert= 6,880.59', Outlet Invert= 6,854.65' ‡ Reach 36R: Reach-10A Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=2.069 ac Avg. Flow Depth=0.04' Max Vel=1.70 fps n=0.030 L=243.6' S=0.1065 '/' Capacity=81.56 cfs 0.44 cfs0.44 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 20HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 36R: Reach-10A Primary Stage-Discharge Discharge (cfs) 80757065605550454035302520151050Depth (feet)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Reach 36R: Reach-10A Storage Stage-Storage Storage (cubic-feet) 2,8002,6002,4002,2002,0001,8001,6001,4001,2001,0008006004002000Depth (feet)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 21HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 36R: Reach-10A Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,880.59 0.00 5.60 0.00 0 6,880.59 0.00 6.20 0.00 0 6,880.59 0.00 6.80 0.00 0 6,880.59 0.00 7.40 0.00 0 6,880.59 0.00 8.00 0.00 0 6,880.59 0.00 8.60 0.00 0 6,880.59 0.00 9.20 0.00 0 6,880.59 0.00 9.80 0.00 0 6,880.59 0.00 10.40 0.00 0 6,880.59 0.00 11.00 0.00 0 6,880.59 0.00 11.60 0.01 3 6,880.59 0.00 12.20 0.44 63 6,880.63 0.44 12.80 0.24 44 6,880.62 0.26 13.40 0.13 27 6,880.61 0.13 14.00 0.09 22 6,880.61 0.10 14.60 0.08 19 6,880.61 0.08 15.20 0.07 18 6,880.61 0.07 15.80 0.06 17 6,880.60 0.06 16.40 0.05 15 6,880.60 0.05 17.00 0.05 14 6,880.60 0.05 17.60 0.05 14 6,880.60 0.05 18.20 0.04 13 6,880.60 0.04 18.80 0.04 13 6,880.60 0.04 19.40 0.04 12 6,880.60 0.04 20.00 0.03 11 6,880.60 0.03 20.60 0.03 11 6,880.60 0.03 21.20 0.03 11 6,880.60 0.03 21.80 0.03 10 6,880.60 0.03 22.40 0.03 10 6,880.60 0.03 23.00 0.03 10 6,880.60 0.03 23.60 0.03 10 6,880.60 0.03 24.20 0.02 10 6,880.60 0.03 24.80 0.00 2 6,880.59 0.00 25.40 0.00 0 6,880.59 0.00 26.00 0.00 0 6,880.59 0.00 26.60 0.00 0 6,880.59 0.00 27.20 0.00 0 6,880.59 0.00 27.80 0.00 0 6,880.59 0.00 28.40 0.00 0 6,880.59 0.00 29.00 0.00 0 6,880.59 0.00 29.60 0.00 0 6,880.59 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 22HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 36R: Reach-10A Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,880.59 0.00 0.00 6,880.60 0.71 0.03 6,880.61 1.07 0.10 6,880.62 1.36 0.21 6,880.63 1.60 0.36 6,880.64 1.81 0.54 6,880.65 2.00 0.77 6,880.66 2.18 1.04 6,880.67 2.35 1.35 6,880.68 2.51 1.71 6,880.69 2.66 2.13 6,880.70 2.80 2.59 6,880.71 2.94 3.11 6,880.72 3.08 3.68 6,880.73 3.21 4.31 6,880.74 3.34 5.00 6,880.75 3.46 5.76 6,880.76 3.58 6.58 6,880.77 3.70 7.46 6,880.78 3.82 8.41 6,880.79 3.93 9.44 6,880.80 4.04 10.53 6,880.81 4.16 11.70 6,880.82 4.26 12.95 6,880.83 4.37 14.27 6,880.84 4.48 15.67 6,880.85 4.58 17.16 6,880.86 4.69 18.72 6,880.87 4.79 20.37 6,880.88 4.89 22.11 6,880.89 4.99 23.94 6,880.90 5.09 25.86 6,880.91 5.18 27.86 6,880.92 5.28 29.97 6,880.93 5.37 32.16 6,880.94 5.47 34.46 6,880.95 5.56 36.85 6,880.96 5.66 39.34 6,880.97 5.75 41.93 6,880.98 5.84 44.63 6,880.99 5.93 47.43 6,881.00 6.02 50.34 6,881.01 6.11 53.36 6,881.02 6.20 56.48 6,881.03 6.28 59.72 6,881.04 6.37 63.07 6,881.05 6.46 66.53 6,881.06 6.54 70.11 6,881.07 6.63 73.81 6,881.08 6.71 77.62 6,881.09 6.80 81.56 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 23HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 36R: Reach-10A Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,880.59 0.0 0 6,880.60 0.0 11 6,880.61 0.1 23 6,880.62 0.2 38 6,880.63 0.2 55 6,880.64 0.3 73 6,880.65 0.4 94 6,880.66 0.5 116 6,880.67 0.6 140 6,880.68 0.7 167 6,880.69 0.8 195 6,880.70 0.9 225 6,880.71 1.1 257 6,880.72 1.2 291 6,880.73 1.3 327 6,880.74 1.5 365 6,880.75 1.7 405 6,880.76 1.8 447 6,880.77 2.0 491 6,880.78 2.2 537 6,880.79 2.4 585 6,880.80 2.6 634 6,880.81 2.8 686 6,880.82 3.0 740 6,880.83 3.3 795 6,880.84 3.5 853 6,880.85 3.7 912 6,880.86 4.0 973 6,880.87 4.3 1,037 6,880.88 4.5 1,102 6,880.89 4.8 1,169 6,880.90 5.1 1,238 6,880.91 5.4 1,310 6,880.92 5.7 1,383 6,880.93 6.0 1,458 6,880.94 6.3 1,535 6,880.95 6.6 1,614 6,880.96 7.0 1,694 6,880.97 7.3 1,777 6,880.98 7.6 1,862 6,880.99 8.0 1,949 6,881.00 8.4 2,037 6,881.01 8.7 2,128 6,881.02 9.1 2,221 6,881.03 9.5 2,315 6,881.04 9.9 2,412 6,881.05 10.3 2,510 6,881.06 10.7 2,610 6,881.07 11.1 2,713 6,881.08 11.6 2,817 6,881.09 12.0 2,923 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 24HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 37R: Reach-10B [62] Hint: Exceeded Reach 36R OUTLET depth by 0.17' @ 12.26 hrs Inflow Area = 2.069 ac, 12.55% Impervious, Inflow Depth = 0.55" for 25-YR event Inflow = 0.96 cfs @ 12.21 hrs, Volume= 0.094 af Outflow = 0.94 cfs @ 12.26 hrs, Volume= 0.094 af, Atten= 3%, Lag= 2.7 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 3.06 fps, Min. Travel Time= 3.1 min Avg. Velocity = 1.39 fps, Avg. Travel Time= 6.8 min Peak Storage= 174 cf @ 12.26 hrs Average Depth at Peak Storage= 0.21' , Surface Width= 2.89' Bank-Full Depth= 1.00' Flow Area= 6.8 sf, Capacity= 58.35 cfs 0.00' x 1.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 1.9 11.7 '/' Top Width= 13.60' Length= 565.8' Slope= 0.0778 '/' Inlet Invert= 6,854.65', Outlet Invert= 6,810.65' ‡ Reach 37R: Reach-10B Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Inflow Area=2.069 ac Avg. Flow Depth=0.21' Max Vel=3.06 fps n=0.030 L=565.8' S=0.0778 '/' Capacity=58.35 cfs 0.96 cfs 0.94 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 25HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 37R: Reach-10B Primary Stage-Discharge Discharge (cfs) 5550454035302520151050Depth (feet)1 0 Reach 37R: Reach-10B Storage Stage-Storage Storage (cubic-feet) 3,5003,0002,5002,0001,5001,0005000Depth (feet)1 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 26HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 37R: Reach-10B Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,854.65 0.00 5.60 0.00 0 6,854.65 0.00 6.20 0.00 0 6,854.65 0.00 6.80 0.00 0 6,854.65 0.00 7.40 0.00 0 6,854.65 0.00 8.00 0.00 0 6,854.65 0.00 8.60 0.00 0 6,854.65 0.00 9.20 0.00 0 6,854.65 0.00 9.80 0.00 0 6,854.65 0.00 10.40 0.00 0 6,854.65 0.00 11.00 0.00 0 6,854.65 0.00 11.60 0.00 1 6,854.67 0.00 12.20 0.96 166 6,854.86 0.88 12.80 0.26 72 6,854.79 0.29 13.40 0.13 41 6,854.75 0.14 14.00 0.10 32 6,854.74 0.10 14.60 0.08 27 6,854.73 0.08 15.20 0.07 25 6,854.73 0.07 15.80 0.06 23 6,854.73 0.06 16.40 0.05 20 6,854.72 0.05 17.00 0.05 19 6,854.72 0.05 17.60 0.05 18 6,854.72 0.05 18.20 0.04 17 6,854.72 0.04 18.80 0.04 17 6,854.72 0.04 19.40 0.04 16 6,854.71 0.04 20.00 0.03 15 6,854.71 0.03 20.60 0.03 14 6,854.71 0.03 21.20 0.03 13 6,854.71 0.03 21.80 0.03 13 6,854.71 0.03 22.40 0.03 13 6,854.71 0.03 23.00 0.03 13 6,854.71 0.03 23.60 0.03 13 6,854.71 0.03 24.20 0.03 12 6,854.71 0.03 24.80 0.00 4 6,854.68 0.01 25.40 0.00 1 6,854.66 0.00 26.00 0.00 0 6,854.65 0.00 26.60 0.00 0 6,854.65 0.00 27.20 0.00 0 6,854.65 0.00 27.80 0.00 0 6,854.65 0.00 28.40 0.00 0 6,854.65 0.00 29.00 0.00 0 6,854.65 0.00 29.60 0.00 0 6,854.65 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 27HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 37R: Reach-10B Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,854.65 0.00 0.00 6,854.66 0.40 0.00 6,854.67 0.63 0.00 6,854.68 0.83 0.01 6,854.69 1.00 0.01 6,854.70 1.16 0.02 6,854.71 1.32 0.03 6,854.72 1.46 0.05 6,854.73 1.59 0.07 6,854.74 1.72 0.09 6,854.75 1.85 0.13 6,854.76 1.97 0.16 6,854.77 2.09 0.20 6,854.78 2.20 0.25 6,854.79 2.31 0.31 6,854.80 2.42 0.37 6,854.81 2.53 0.44 6,854.82 2.63 0.52 6,854.83 2.74 0.60 6,854.84 2.84 0.70 6,854.85 2.93 0.80 6,854.86 3.03 0.91 6,854.87 3.13 1.03 6,854.88 3.22 1.16 6,854.89 3.31 1.30 6,854.90 3.41 1.45 6,854.91 3.50 1.61 6,854.92 3.58 1.78 6,854.93 3.67 1.96 6,854.94 3.76 2.15 6,854.95 3.85 2.35 6,854.96 3.93 2.57 6,854.97 4.01 2.80 6,854.98 4.10 3.03 6,854.99 4.18 3.29 6,855.00 4.26 3.55 6,855.01 4.34 3.83 6,855.02 4.42 4.12 6,855.03 4.50 4.42 6,855.04 4.58 4.74 6,855.05 4.66 5.07 6,855.06 4.74 5.41 6,855.07 4.81 5.77 6,855.08 4.89 6.15 6,855.09 4.96 6.53 6,855.10 5.04 6.94 6,855.11 5.11 7.36 6,855.12 5.19 7.79 6,855.13 5.26 8.24 6,855.14 5.33 8.71 6,855.15 5.41 9.19 6,855.16 5.48 9.69 6,855.17 5.55 10.20 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,855.18 5.62 10.73 6,855.19 5.69 11.28 6,855.20 5.76 11.85 6,855.21 5.83 12.43 6,855.22 5.90 13.03 6,855.23 5.97 13.65 6,855.24 6.04 14.29 6,855.25 6.10 14.94 6,855.26 6.17 15.62 6,855.27 6.24 16.31 6,855.28 6.31 17.02 6,855.29 6.37 17.75 6,855.30 6.44 18.50 6,855.31 6.50 19.27 6,855.32 6.57 20.05 6,855.33 6.64 20.86 6,855.34 6.70 21.69 6,855.35 6.76 22.54 6,855.36 6.83 23.41 6,855.37 6.89 24.30 6,855.38 6.96 25.21 6,855.39 7.02 26.14 6,855.40 7.08 27.09 6,855.41 7.15 28.07 6,855.42 7.21 29.06 6,855.43 7.27 30.08 6,855.44 7.33 31.12 6,855.45 7.39 32.18 6,855.46 7.46 33.26 6,855.47 7.52 34.37 6,855.48 7.58 35.50 6,855.49 7.64 36.65 6,855.50 7.70 37.83 6,855.51 7.76 39.02 6,855.52 7.82 40.25 6,855.53 7.88 41.49 6,855.54 7.94 42.76 6,855.55 8.00 44.05 6,855.56 8.06 45.37 6,855.57 8.12 46.71 6,855.58 8.18 48.08 6,855.59 8.23 49.47 6,855.60 8.29 50.89 6,855.61 8.35 52.33 6,855.62 8.41 53.79 6,855.63 8.47 55.29 6,855.64 8.52 56.80 6,855.65 8.58 58.35 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 28HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 37R: Reach-10B Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,854.65 0.0 0 6,854.66 0.0 0 6,854.67 0.0 2 6,854.68 0.0 3 6,854.69 0.0 6 6,854.70 0.0 10 6,854.71 0.0 14 6,854.72 0.0 19 6,854.73 0.0 25 6,854.74 0.1 31 6,854.75 0.1 38 6,854.76 0.1 47 6,854.77 0.1 55 6,854.78 0.1 65 6,854.79 0.1 75 6,854.80 0.2 87 6,854.81 0.2 98 6,854.82 0.2 111 6,854.83 0.2 125 6,854.84 0.2 139 6,854.85 0.3 154 6,854.86 0.3 170 6,854.87 0.3 186 6,854.88 0.4 204 6,854.89 0.4 222 6,854.90 0.4 240 6,854.91 0.5 260 6,854.92 0.5 280 6,854.93 0.5 302 6,854.94 0.6 324 6,854.95 0.6 346 6,854.96 0.7 370 6,854.97 0.7 394 6,854.98 0.7 419 6,854.99 0.8 445 6,855.00 0.8 471 6,855.01 0.9 499 6,855.02 0.9 527 6,855.03 1.0 556 6,855.04 1.0 585 6,855.05 1.1 616 6,855.06 1.1 647 6,855.07 1.2 679 6,855.08 1.3 711 6,855.09 1.3 745 6,855.10 1.4 779 6,855.11 1.4 814 6,855.12 1.5 850 6,855.13 1.6 886 6,855.14 1.6 924 6,855.15 1.7 962 6,855.16 1.8 1,001 6,855.17 1.8 1,040 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,855.18 1.9 1,081 6,855.19 2.0 1,122 6,855.20 2.1 1,164 6,855.21 2.1 1,207 6,855.22 2.2 1,250 6,855.23 2.3 1,294 6,855.24 2.4 1,339 6,855.25 2.4 1,385 6,855.26 2.5 1,432 6,855.27 2.6 1,479 6,855.28 2.7 1,527 6,855.29 2.8 1,576 6,855.30 2.9 1,626 6,855.31 3.0 1,676 6,855.32 3.1 1,727 6,855.33 3.1 1,779 6,855.34 3.2 1,832 6,855.35 3.3 1,885 6,855.36 3.4 1,939 6,855.37 3.5 1,995 6,855.38 3.6 2,050 6,855.39 3.7 2,107 6,855.40 3.8 2,164 6,855.41 3.9 2,222 6,855.42 4.0 2,281 6,855.43 4.1 2,341 6,855.44 4.2 2,401 6,855.45 4.4 2,462 6,855.46 4.5 2,524 6,855.47 4.6 2,587 6,855.48 4.7 2,651 6,855.49 4.8 2,715 6,855.50 4.9 2,780 6,855.51 5.0 2,846 6,855.52 5.1 2,912 6,855.53 5.3 2,979 6,855.54 5.4 3,048 6,855.55 5.5 3,116 6,855.56 5.6 3,186 6,855.57 5.8 3,256 6,855.58 5.9 3,328 6,855.59 6.0 3,400 6,855.60 6.1 3,472 6,855.61 6.3 3,546 6,855.62 6.4 3,620 6,855.63 6.5 3,695 6,855.64 6.7 3,771 6,855.65 6.8 3,847 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 29HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Pond 12P: PRE-AREA-10-CULVERT [57] Hint: Peaked at 6,882.15' (Flood elevation advised) Inflow Area = 2.069 ac, 12.55% Impervious, Inflow Depth = 0.55" for 25-YR event Inflow = 0.96 cfs @ 12.21 hrs, Volume= 0.094 af Outflow = 0.96 cfs @ 12.21 hrs, Volume= 0.094 af, Atten= 0%, Lag= 0.0 min Primary = 0.44 cfs @ 12.21 hrs, Volume= 0.081 af Secondary = 0.53 cfs @ 12.21 hrs, Volume= 0.013 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Peak Elev= 6,882.15' @ 12.21 hrs Device Routing Invert Outlet Devices #1 Primary 6,881.48'12.0" Round Culvert w/ 9.0" inside fill L= 38.8' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 6,880.73' / 6,879.51' S= 0.0314 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 0.15 sf #2 Secondary 6,882.03'Asymmetrical Weir, C= 3.27 Offset (feet) 0.00 49.91 60.67 72.06 82.74 Height (feet) 1.24 0.00 0.23 0.82 1.24 Primary OutFlow Max=0.44 cfs @ 12.21 hrs HW=6,882.15' TW=6,880.63' (Dynamic Tailwater) 1=Culvert (Inlet Controls 0.44 cfs @ 2.85 fps) Secondary OutFlow Max=0.52 cfs @ 12.21 hrs HW=6,882.15' TW=6,854.86' (Dynamic Tailwater) 2=Asymmetrical Weir (Weir Controls 0.52 cfs @ 0.45 fps) Pond 12P: PRE-AREA-10-CULVERT Inflow Outflow Primary Secondary Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Inflow Area=2.069 ac Peak Elev=6,882.15' 0.96 cfs0.96 cfs 0.44 cfs0.53 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 30HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Pond 12P: PRE-AREA-10-CULVERT Total Primary Secondary Stage-Discharge Discharge (cfs) 140120100806040200Elevation (feet)6,883 6,882 Culvert Asymmetrical Weir Pond 12P: PRE-AREA-10-CULVERT Storage Stage-Area-Storage Storage (acre-feet) 0Elevation (feet)6,883 6,882 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 31HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Pond 12P: PRE-AREA-10-CULVERT Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) Primary (cfs) Secondary (cfs) 5.00 0.00 6,881.48 0.00 0.00 0.00 5.60 0.00 6,881.48 0.00 0.00 0.00 6.20 0.00 6,881.48 0.00 0.00 0.00 6.80 0.00 6,881.48 0.00 0.00 0.00 7.40 0.00 6,881.48 0.00 0.00 0.00 8.00 0.00 6,881.48 0.00 0.00 0.00 8.60 0.00 6,881.48 0.00 0.00 0.00 9.20 0.00 6,881.48 0.00 0.00 0.00 9.80 0.00 6,881.48 0.00 0.00 0.00 10.40 0.00 6,881.48 0.00 0.00 0.00 11.00 0.00 6,881.48 0.00 0.00 0.00 11.60 0.01 6,881.51 0.01 0.01 0.00 12.20 0.96 6,882.15 0.96 0.44 0.52 12.80 0.24 6,881.77 0.24 0.24 0.00 13.40 0.13 6,881.64 0.13 0.13 0.00 14.00 0.09 6,881.61 0.09 0.09 0.00 14.60 0.08 6,881.59 0.08 0.08 0.00 15.20 0.07 6,881.58 0.07 0.07 0.00 15.80 0.06 6,881.58 0.06 0.06 0.00 16.40 0.05 6,881.57 0.05 0.05 0.00 17.00 0.05 6,881.56 0.05 0.05 0.00 17.60 0.05 6,881.56 0.05 0.05 0.00 18.20 0.04 6,881.56 0.04 0.04 0.00 18.80 0.04 6,881.55 0.04 0.04 0.00 19.40 0.04 6,881.55 0.04 0.04 0.00 20.00 0.03 6,881.54 0.03 0.03 0.00 20.60 0.03 6,881.54 0.03 0.03 0.00 21.20 0.03 6,881.54 0.03 0.03 0.00 21.80 0.03 6,881.54 0.03 0.03 0.00 22.40 0.03 6,881.54 0.03 0.03 0.00 23.00 0.03 6,881.54 0.03 0.03 0.00 23.60 0.03 6,881.54 0.03 0.03 0.00 24.20 0.02 6,881.53 0.02 0.02 0.00 24.80 0.00 6,881.49 0.00 0.00 0.00 25.40 0.00 6,881.48 0.00 0.00 0.00 26.00 0.00 6,881.48 0.00 0.00 0.00 26.60 0.00 6,881.48 0.00 0.00 0.00 27.20 0.00 6,881.48 0.00 0.00 0.00 27.80 0.00 6,881.48 0.00 0.00 0.00 28.40 0.00 6,881.48 0.00 0.00 0.00 29.00 0.00 6,881.48 0.00 0.00 0.00 29.60 0.00 6,881.48 0.00 0.00 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 32HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Pond 12P: PRE-AREA-10-CULVERT Elevation (feet) Discharge (cfs) Primary (cfs) Secondary (cfs) 6,881.48 0.00 0.00 0.00 6,881.50 0.01 0.01 0.00 6,881.52 0.02 0.02 0.00 6,881.54 0.03 0.03 0.00 6,881.56 0.05 0.05 0.00 6,881.58 0.07 0.07 0.00 6,881.60 0.08 0.08 0.00 6,881.62 0.10 0.10 0.00 6,881.64 0.13 0.13 0.00 6,881.66 0.15 0.15 0.00 6,881.68 0.17 0.17 0.00 6,881.70 0.19 0.19 0.00 6,881.72 0.21 0.21 0.00 6,881.74 0.23 0.23 0.00 6,881.76 0.24 0.24 0.00 6,881.78 0.26 0.26 0.00 6,881.80 0.27 0.27 0.00 6,881.82 0.28 0.28 0.00 6,881.84 0.29 0.29 0.00 6,881.86 0.31 0.31 0.00 6,881.88 0.32 0.32 0.00 6,881.90 0.33 0.33 0.00 6,881.92 0.34 0.34 0.00 6,881.94 0.35 0.35 0.00 6,881.96 0.36 0.36 0.00 6,881.98 0.37 0.37 0.00 6,882.00 0.38 0.38 0.00 6,882.02 0.38 0.38 0.00 6,882.04 0.39 0.39 0.00 6,882.06 0.42 0.40 0.02 6,882.08 0.47 0.41 0.06 6,882.10 0.57 0.42 0.15 6,882.12 0.70 0.43 0.28 6,882.14 0.89 0.44 0.46 6,882.16 1.14 0.44 0.69 6,882.18 1.44 0.45 0.99 6,882.20 1.81 0.46 1.36 6,882.22 2.26 0.47 1.79 6,882.24 2.77 0.47 2.30 6,882.26 3.37 0.48 2.89 6,882.28 4.04 0.49 3.56 6,882.30 4.79 0.49 4.30 6,882.32 5.62 0.50 5.12 6,882.34 6.53 0.51 6.03 6,882.36 7.52 0.51 7.01 6,882.38 8.59 0.52 8.07 6,882.40 9.74 0.53 9.22 6,882.42 10.98 0.53 10.45 6,882.44 12.30 0.54 11.76 6,882.46 13.71 0.55 13.16 6,882.48 15.20 0.55 14.65 6,882.50 16.78 0.56 16.23 6,882.52 18.46 0.56 17.89 Elevation (feet) Discharge (cfs) Primary (cfs) Secondary (cfs) 6,882.54 20.23 0.57 19.65 6,882.56 22.08 0.58 21.51 6,882.58 24.04 0.58 23.46 6,882.60 26.09 0.59 25.50 6,882.62 28.24 0.59 27.64 6,882.64 30.48 0.60 29.88 6,882.66 32.83 0.61 32.23 6,882.68 35.28 0.61 34.67 6,882.70 37.83 0.62 37.21 6,882.72 40.48 0.62 39.86 6,882.74 43.24 0.63 42.62 6,882.76 46.11 0.63 45.48 6,882.78 49.09 0.64 48.45 6,882.80 52.17 0.64 51.53 6,882.82 55.36 0.65 54.71 6,882.84 58.67 0.65 58.01 6,882.86 62.08 0.66 61.43 6,882.88 65.62 0.66 64.95 6,882.90 69.27 0.67 68.60 6,882.92 73.03 0.67 72.36 6,882.94 76.92 0.68 76.24 6,882.96 80.93 0.68 80.25 6,882.98 85.07 0.69 84.38 6,883.00 89.33 0.69 88.63 6,883.02 93.71 0.70 93.01 6,883.04 98.22 0.70 97.52 6,883.06 102.87 0.71 102.16 6,883.08 107.64 0.71 106.93 6,883.10 112.54 0.72 111.83 6,883.12 117.58 0.72 116.86 6,883.14 122.76 0.73 122.03 6,883.16 128.06 0.73 127.33 6,883.18 133.51 0.74 132.77 6,883.20 139.09 0.74 138.35 6,883.22 144.82 0.75 144.07 6,883.24 150.68 0.75 149.93 6,883.26 156.69 0.76 155.93 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 33HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 12P: PRE-AREA-10-CULVERT Elevation (feet) Storage (acre-feet) 6,881.48 0.000 6,881.50 0.000 6,881.52 0.000 6,881.54 0.000 6,881.56 0.000 6,881.58 0.000 6,881.60 0.000 6,881.62 0.000 6,881.64 0.000 6,881.66 0.000 6,881.68 0.000 6,881.70 0.000 6,881.72 0.000 6,881.74 0.000 6,881.76 0.000 6,881.78 0.000 6,881.80 0.000 6,881.82 0.000 6,881.84 0.000 6,881.86 0.000 6,881.88 0.000 6,881.90 0.000 6,881.92 0.000 6,881.94 0.000 6,881.96 0.000 6,881.98 0.000 6,882.00 0.000 6,882.02 0.000 6,882.04 0.000 6,882.06 0.000 6,882.08 0.000 6,882.10 0.000 6,882.12 0.000 6,882.14 0.000 6,882.16 0.000 6,882.18 0.000 6,882.20 0.000 6,882.22 0.000 6,882.24 0.000 6,882.26 0.000 6,882.28 0.000 6,882.30 0.000 6,882.32 0.000 6,882.34 0.000 6,882.36 0.000 6,882.38 0.000 6,882.40 0.000 6,882.42 0.000 6,882.44 0.000 6,882.46 0.000 6,882.48 0.000 6,882.50 0.000 6,882.52 0.000 Elevation (feet) Storage (acre-feet) 6,882.54 0.000 6,882.56 0.000 6,882.58 0.000 6,882.60 0.000 6,882.62 0.000 6,882.64 0.000 6,882.66 0.000 6,882.68 0.000 6,882.70 0.000 6,882.72 0.000 6,882.74 0.000 6,882.76 0.000 6,882.78 0.000 6,882.80 0.000 6,882.82 0.000 6,882.84 0.000 6,882.86 0.000 6,882.88 0.000 6,882.90 0.000 6,882.92 0.000 6,882.94 0.000 6,882.96 0.000 6,882.98 0.000 6,883.00 0.000 6,883.02 0.000 6,883.04 0.000 6,883.06 0.000 6,883.08 0.000 6,883.10 0.000 6,883.12 0.000 6,883.14 0.000 6,883.16 0.000 6,883.18 0.000 6,883.20 0.000 6,883.22 0.000 6,883.24 0.000 6,883.26 0.000 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 34HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Time span=5.00-30.00 hrs, dt=0.03 hrs, 834 points x 3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2.069 ac 12.55% Impervious Runoff Depth=0.90"Subcatchment 33S: PRE-AREA-10 Flow Length=473' Tc=25.6 min CN=74 Runoff=1.68 cfs 0.155 af Runoff Area=2.669 ac 7.76% Impervious Runoff Depth=0.77"Subcatchment 34S: PRE-AREA-03 Flow Length=839' Tc=18.1 min CN=71 Runoff=2.24 cfs 0.171 af Avg. Flow Depth=0.18' Max Vel=3.45 fps Inflow=3.59 cfs 0.326 afReach 35R: Reach 03 n=0.035 L=92.4' S=0.0937 '/' Capacity=4.40 cfs Outflow=3.59 cfs 0.326 af Avg. Flow Depth=0.05' Max Vel=1.72 fps Inflow=0.46 cfs 0.115 afReach 36R: Reach-10A n=0.030 L=243.6' S=0.1065 '/' Capacity=81.56 cfs Outflow=0.45 cfs 0.115 af Avg. Flow Depth=0.26' Max Vel=3.51 fps Inflow=1.68 cfs 0.155 afReach 37R: Reach-10B n=0.030 L=565.8' S=0.0778 '/' Capacity=58.35 cfs Outflow=1.64 cfs 0.155 af Peak Elev=6,882.19' Inflow=1.68 cfs 0.155 afPond 12P: PRE-AREA-10-CULVERT Primary=0.46 cfs 0.115 af Secondary=1.22 cfs 0.040 af Outflow=1.68 cfs 0.155 af Total Runoff Area = 4.738 ac Runoff Volume = 0.326 af Average Runoff Depth = 0.83" 90.15% Pervious = 4.271 ac 9.85% Impervious = 0.467 ac Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 35HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 33S: PRE-AREA-10 [47] Hint: Peak is 2400% of capacity of segment #3 [47] Hint: Peak is 1069% of capacity of segment #4 [47] Hint: Peak is 365% of capacity of segment #5 Runoff = 1.68 cfs @ 12.21 hrs, Volume= 0.155 af, Depth= 0.90" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.15 Area (ac) CN Description 0.592 81 1/3 acre lots, 30% imp, HSG C 0.986 71 Meadow, non-grazed, HSG C 0.304 57 Oak/aspen range, Fair, HSG C 0.105 87 Dirt roads, HSG C 0.082 98 Paved parking, HSG C 2.069 74 Weighted Average 1.809 87.45% Pervious Area 0.260 12.55% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 22.9 200 0.2046 0.15 Sheet Flow, Oak Brush - Meadow Woods: Light underbrush n= 0.400 P2= 1.33" 0.3 45 0.3536 2.97 Shallow Concentrated Flow, Oak Brush - Meadow Woodland Kv= 5.0 fps 1.1 64 0.0144 1.00 0.07 Trap/Vee/Rect Channel Flow, Old Irrigation Ditch Bot.W=0.00' D=0.20' Z= 1.9 & 1.6 '/' Top.W=0.70' n= 0.035 Earth, dense weeds 0.7 64 0.2359 1.57 0.16 Trap/Vee/Rect Channel Flow, Slope through Oak Brush - Meado Bot.W=4.00' D=0.02' Z= 50.0 '/' Top.W=6.00' n= 0.030 Earth, grassed & winding 0.6 100 0.0624 2.94 0.46 Trap/Vee/Rect Channel Flow, Roadside Ditch Bot.W=0.00' D=0.25' Z= 2.5 '/' Top.W=1.25' n= 0.030 Earth, grassed & winding 25.6 473 Total Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 36HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcatchment 33S: PRE-AREA-10 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Type II 24-hr 100-YR Rainfall=2.81" Ia/S=0.15 Runoff Area=2.069 ac Runoff Volume=0.155 af Runoff Depth=0.90" Flow Length=473' Tc=25.6 min CN=74 1.68 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 37HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 33S: PRE-AREA-10 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.18 0.00 0.00 5.30 0.19 0.00 0.00 5.60 0.21 0.00 0.00 5.90 0.22 0.00 0.00 6.20 0.24 0.00 0.00 6.50 0.25 0.00 0.00 6.80 0.27 0.00 0.00 7.10 0.28 0.00 0.00 7.40 0.30 0.00 0.00 7.70 0.32 0.00 0.00 8.00 0.34 0.00 0.00 8.30 0.36 0.00 0.00 8.60 0.38 0.00 0.00 8.90 0.40 0.00 0.00 9.20 0.43 0.00 0.00 9.50 0.46 0.00 0.00 9.80 0.49 0.00 0.00 10.10 0.52 0.00 0.00 10.40 0.56 0.00 0.00 10.70 0.60 0.00 0.00 11.00 0.66 0.00 0.01 11.30 0.73 0.01 0.03 11.60 0.86 0.03 0.06 11.90 1.60 0.25 0.34 12.20 1.96 0.42 1.68 12.50 2.07 0.47 0.80 12.80 2.13 0.50 0.39 13.10 2.19 0.53 0.26 13.40 2.23 0.56 0.20 13.70 2.27 0.58 0.17 14.00 2.30 0.60 0.15 14.30 2.33 0.61 0.13 14.60 2.36 0.63 0.12 14.90 2.39 0.65 0.11 15.20 2.41 0.66 0.11 15.50 2.44 0.67 0.10 15.80 2.46 0.69 0.09 16.10 2.48 0.70 0.09 16.40 2.50 0.71 0.08 16.70 2.52 0.72 0.08 17.00 2.53 0.73 0.07 17.30 2.55 0.74 0.07 17.60 2.57 0.75 0.07 17.90 2.58 0.76 0.07 18.20 2.60 0.77 0.07 18.50 2.61 0.78 0.06 18.80 2.63 0.79 0.06 19.10 2.64 0.79 0.06 19.40 2.65 0.80 0.06 19.70 2.66 0.81 0.05 20.00 2.68 0.82 0.05 20.30 2.69 0.82 0.05 20.60 2.70 0.83 0.05 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.71 0.83 0.05 21.20 2.72 0.84 0.05 21.50 2.73 0.85 0.05 21.80 2.74 0.85 0.04 22.10 2.75 0.86 0.04 22.40 2.76 0.87 0.04 22.70 2.77 0.87 0.04 23.00 2.78 0.88 0.04 23.30 2.79 0.89 0.04 23.60 2.80 0.89 0.04 23.90 2.81 0.90 0.04 24.20 2.81 0.90 0.04 24.50 2.81 0.90 0.01 24.80 2.81 0.90 0.00 25.10 2.81 0.90 0.00 25.40 2.81 0.90 0.00 25.70 2.81 0.90 0.00 26.00 2.81 0.90 0.00 26.30 2.81 0.90 0.00 26.60 2.81 0.90 0.00 26.90 2.81 0.90 0.00 27.20 2.81 0.90 0.00 27.50 2.81 0.90 0.00 27.80 2.81 0.90 0.00 28.10 2.81 0.90 0.00 28.40 2.81 0.90 0.00 28.70 2.81 0.90 0.00 29.00 2.81 0.90 0.00 29.30 2.81 0.90 0.00 29.60 2.81 0.90 0.00 29.90 2.81 0.90 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 38HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 34S: PRE-AREA-03 Runoff = 2.24 cfs @ 12.12 hrs, Volume= 0.171 af, Depth= 0.77" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.15 Area (ac) CN Description 2.088 71 Meadow, non-grazed, HSG C 0.374 57 Oak/aspen range, Fair, HSG C 0.207 98 Paved parking, HSG C 2.669 71 Weighted Average 2.462 92.24% Pervious Area 0.207 7.76% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.8 75 0.0902 1.53 Sheet Flow, Driveway Pavement Smooth surfaces n= 0.011 P2= 1.33" 11.7 126 0.1558 0.18 Sheet Flow, Grass Meadow Grass: Dense n= 0.240 P2= 1.33" 5.3 506 0.1005 1.59 Shallow Concentrated Flow, Grass Meadow Woodland Kv= 5.0 fps 0.3 132 0.0766 8.46 39.77 Trap/Vee/Rect Channel Flow, Roadside Ditch Bot.W=0.00' D=1.00' Z= 2.1 & 7.3 '/' Top.W=9.40' n= 0.030 Earth, grassed & winding 18.1 839 Total Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 39HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcatchment 34S: PRE-AREA-03 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)2 1 0 Type II 24-hr 100-YR Rainfall=2.81" Ia/S=0.15 Runoff Area=2.669 ac Runoff Volume=0.171 af Runoff Depth=0.77" Flow Length=839' Tc=18.1 min CN=71 2.24 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 40HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 34S: PRE-AREA-03 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.18 0.00 0.00 5.30 0.19 0.00 0.00 5.60 0.21 0.00 0.00 5.90 0.22 0.00 0.00 6.20 0.24 0.00 0.00 6.50 0.25 0.00 0.00 6.80 0.27 0.00 0.00 7.10 0.28 0.00 0.00 7.40 0.30 0.00 0.00 7.70 0.32 0.00 0.00 8.00 0.34 0.00 0.00 8.30 0.36 0.00 0.00 8.60 0.38 0.00 0.00 8.90 0.40 0.00 0.00 9.20 0.43 0.00 0.00 9.50 0.46 0.00 0.00 9.80 0.49 0.00 0.00 10.10 0.52 0.00 0.00 10.40 0.56 0.00 0.00 10.70 0.60 0.00 0.00 11.00 0.66 0.00 0.00 11.30 0.73 0.00 0.02 11.60 0.86 0.01 0.05 11.90 1.60 0.19 0.59 12.20 1.96 0.34 1.90 12.50 2.07 0.38 0.61 12.80 2.13 0.41 0.33 13.10 2.19 0.44 0.25 13.40 2.23 0.46 0.21 13.70 2.27 0.48 0.18 14.00 2.30 0.50 0.16 14.30 2.33 0.51 0.14 14.60 2.36 0.53 0.13 14.90 2.39 0.54 0.13 15.20 2.41 0.55 0.12 15.50 2.44 0.56 0.11 15.80 2.46 0.58 0.10 16.10 2.48 0.59 0.10 16.40 2.50 0.60 0.09 16.70 2.52 0.61 0.09 17.00 2.53 0.61 0.09 17.30 2.55 0.62 0.08 17.60 2.57 0.63 0.08 17.90 2.58 0.64 0.08 18.20 2.60 0.65 0.08 18.50 2.61 0.66 0.07 18.80 2.63 0.66 0.07 19.10 2.64 0.67 0.07 19.40 2.65 0.68 0.06 19.70 2.66 0.69 0.06 20.00 2.68 0.69 0.06 20.30 2.69 0.70 0.06 20.60 2.70 0.70 0.05 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.71 0.71 0.05 21.20 2.72 0.72 0.05 21.50 2.73 0.72 0.05 21.80 2.74 0.73 0.05 22.10 2.75 0.73 0.05 22.40 2.76 0.74 0.05 22.70 2.77 0.74 0.05 23.00 2.78 0.75 0.05 23.30 2.79 0.76 0.05 23.60 2.80 0.76 0.05 23.90 2.81 0.77 0.05 24.20 2.81 0.77 0.03 24.50 2.81 0.77 0.00 24.80 2.81 0.77 0.00 25.10 2.81 0.77 0.00 25.40 2.81 0.77 0.00 25.70 2.81 0.77 0.00 26.00 2.81 0.77 0.00 26.30 2.81 0.77 0.00 26.60 2.81 0.77 0.00 26.90 2.81 0.77 0.00 27.20 2.81 0.77 0.00 27.50 2.81 0.77 0.00 27.80 2.81 0.77 0.00 28.10 2.81 0.77 0.00 28.40 2.81 0.77 0.00 28.70 2.81 0.77 0.00 29.00 2.81 0.77 0.00 29.30 2.81 0.77 0.00 29.60 2.81 0.77 0.00 29.90 2.81 0.77 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 41HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 35R: Reach 03 [61] Hint: Exceeded Reach 37R outlet invert by 0.18' @ 12.17 hrs Inflow Area = 4.738 ac, 9.85% Impervious, Inflow Depth = 0.83" for 100-YR event Inflow = 3.59 cfs @ 12.16 hrs, Volume= 0.326 af Outflow = 3.59 cfs @ 12.17 hrs, Volume= 0.326 af, Atten= 0%, Lag= 0.3 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 3.45 fps, Min. Travel Time= 0.4 min Avg. Velocity = 1.11 fps, Avg. Travel Time= 1.4 min Peak Storage= 96 cf @ 12.17 hrs Average Depth at Peak Storage= 0.18' , Surface Width= 7.59' Bank-Full Depth= 0.20' Flow Area= 1.2 sf, Capacity= 4.40 cfs 4.00' x 0.20' deep channel, n= 0.035 Earth, dense weeds Side Slope Z-value= 10.0 '/' Top Width= 8.00' Length= 92.4' Slope= 0.0937 '/' Inlet Invert= 6,810.65', Outlet Invert= 6,801.99' ‡ Reach 35R: Reach 03 Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)4 3 2 1 0 Inflow Area=4.738 ac Avg. Flow Depth=0.18' Max Vel=3.45 fps n=0.035 L=92.4' S=0.0937 '/' Capacity=4.40 cfs 3.59 cfs3.59 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 42HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 35R: Reach 03 Primary Stage-Discharge Discharge (cfs) 43210Depth (feet)0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Reach 35R: Reach 03 Storage Stage-Storage Storage (cubic-feet) 1101009080706050403020100Depth (feet)0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 43HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 35R: Reach 03 Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,810.65 0.00 5.60 0.00 0 6,810.65 0.00 6.20 0.00 0 6,810.65 0.00 6.80 0.00 0 6,810.65 0.00 7.40 0.00 0 6,810.65 0.00 8.00 0.00 0 6,810.65 0.00 8.60 0.00 0 6,810.65 0.00 9.20 0.00 0 6,810.65 0.00 9.80 0.00 0 6,810.65 0.00 10.40 0.00 0 6,810.65 0.00 11.00 0.01 1 6,810.65 0.00 11.60 0.09 8 6,810.67 0.08 12.20 3.49 95 6,810.83 3.51 12.80 0.77 34 6,810.73 0.78 13.40 0.42 23 6,810.70 0.42 14.00 0.31 19 6,810.70 0.31 14.60 0.25 16 6,810.69 0.25 15.20 0.23 15 6,810.69 0.23 15.80 0.20 14 6,810.68 0.20 16.40 0.17 13 6,810.68 0.17 17.00 0.16 12 6,810.68 0.16 17.60 0.15 12 6,810.68 0.15 18.20 0.14 11 6,810.68 0.14 18.80 0.13 11 6,810.68 0.13 19.40 0.12 10 6,810.68 0.12 20.00 0.11 10 6,810.67 0.11 20.60 0.10 9 6,810.67 0.10 21.20 0.10 9 6,810.67 0.10 21.80 0.10 9 6,810.67 0.10 22.40 0.10 9 6,810.67 0.10 23.00 0.09 9 6,810.67 0.09 23.60 0.09 9 6,810.67 0.09 24.20 0.07 8 6,810.67 0.08 24.80 0.01 2 6,810.66 0.01 25.40 0.00 1 6,810.65 0.00 26.00 0.00 0 6,810.65 0.00 26.60 0.00 0 6,810.65 0.00 27.20 0.00 0 6,810.65 0.00 27.80 0.00 0 6,810.65 0.00 28.40 0.00 0 6,810.65 0.00 29.00 0.00 0 6,810.65 0.00 29.60 0.00 0 6,810.65 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 44HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 35R: Reach 03 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,810.65 0.00 0.00 6,810.66 0.59 0.02 6,810.67 0.93 0.08 6,810.68 1.20 0.15 6,810.69 1.43 0.25 6,810.70 1.64 0.37 6,810.71 1.83 0.51 6,810.72 2.01 0.66 6,810.73 2.18 0.84 6,810.74 2.33 1.03 6,810.75 2.48 1.24 6,810.76 2.62 1.47 6,810.77 2.75 1.72 6,810.78 2.88 1.98 6,810.79 3.00 2.27 6,810.80 3.12 2.57 6,810.81 3.24 2.90 6,810.82 3.35 3.24 6,810.83 3.46 3.61 6,810.84 3.56 3.99 6,810.85 3.66 4.40 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 45HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 35R: Reach 03 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,810.65 0.0 0 6,810.66 0.0 4 6,810.67 0.1 8 6,810.68 0.1 12 6,810.69 0.2 16 6,810.70 0.2 21 6,810.71 0.3 26 6,810.72 0.3 30 6,810.73 0.4 35 6,810.74 0.4 41 6,810.75 0.5 46 6,810.76 0.6 52 6,810.77 0.6 58 6,810.78 0.7 64 6,810.79 0.8 70 6,810.80 0.8 76 6,810.81 0.9 83 6,810.82 1.0 90 6,810.83 1.0 96 6,810.84 1.1 104 6,810.85 1.2 111 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 46HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 36R: Reach-10A Inflow Area = 2.069 ac, 12.55% Impervious, Inflow Depth = 0.67" for 100-YR event Inflow = 0.46 cfs @ 12.21 hrs, Volume= 0.115 af Outflow = 0.45 cfs @ 12.24 hrs, Volume= 0.115 af, Atten= 0%, Lag= 1.8 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 1.72 fps, Min. Travel Time= 2.4 min Avg. Velocity = 0.93 fps, Avg. Travel Time= 4.3 min Peak Storage= 64 cf @ 12.24 hrs Average Depth at Peak Storage= 0.05' , Surface Width= 7.64' Bank-Full Depth= 0.50' Flow Area= 12.0 sf, Capacity= 81.56 cfs 4.00' x 0.50' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 40.0 '/' Top Width= 44.00' Length= 243.6' Slope= 0.1065 '/' Inlet Invert= 6,880.59', Outlet Invert= 6,854.65' ‡ Reach 36R: Reach-10A Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=2.069 ac Avg. Flow Depth=0.05' Max Vel=1.72 fps n=0.030 L=243.6' S=0.1065 '/' Capacity=81.56 cfs 0.46 cfs0.45 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 47HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 36R: Reach-10A Primary Stage-Discharge Discharge (cfs) 80757065605550454035302520151050Depth (feet)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Reach 36R: Reach-10A Storage Stage-Storage Storage (cubic-feet) 2,8002,6002,4002,2002,0001,8001,6001,4001,2001,0008006004002000Depth (feet)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 48HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 36R: Reach-10A Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,880.59 0.00 5.60 0.00 0 6,880.59 0.00 6.20 0.00 0 6,880.59 0.00 6.80 0.00 0 6,880.59 0.00 7.40 0.00 0 6,880.59 0.00 8.00 0.00 0 6,880.59 0.00 8.60 0.00 0 6,880.59 0.00 9.20 0.00 0 6,880.59 0.00 9.80 0.00 0 6,880.59 0.00 10.40 0.00 0 6,880.59 0.00 11.00 0.01 4 6,880.59 0.01 11.60 0.06 14 6,880.60 0.05 12.20 0.46 64 6,880.64 0.45 12.80 0.39 59 6,880.63 0.40 13.40 0.20 37 6,880.62 0.20 14.00 0.15 30 6,880.61 0.15 14.60 0.12 26 6,880.61 0.12 15.20 0.11 24 6,880.61 0.11 15.80 0.09 22 6,880.61 0.09 16.40 0.08 20 6,880.61 0.08 17.00 0.07 19 6,880.61 0.07 17.60 0.07 18 6,880.61 0.07 18.20 0.07 17 6,880.61 0.07 18.80 0.06 16 6,880.60 0.06 19.40 0.06 16 6,880.60 0.06 20.00 0.05 15 6,880.60 0.05 20.60 0.05 14 6,880.60 0.05 21.20 0.05 14 6,880.60 0.05 21.80 0.04 13 6,880.60 0.04 22.40 0.04 13 6,880.60 0.04 23.00 0.04 13 6,880.60 0.04 23.60 0.04 13 6,880.60 0.04 24.20 0.04 12 6,880.60 0.04 24.80 0.00 2 6,880.59 0.00 25.40 0.00 0 6,880.59 0.00 26.00 0.00 0 6,880.59 0.00 26.60 0.00 0 6,880.59 0.00 27.20 0.00 0 6,880.59 0.00 27.80 0.00 0 6,880.59 0.00 28.40 0.00 0 6,880.59 0.00 29.00 0.00 0 6,880.59 0.00 29.60 0.00 0 6,880.59 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 49HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 36R: Reach-10A Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,880.59 0.00 0.00 6,880.60 0.71 0.03 6,880.61 1.07 0.10 6,880.62 1.36 0.21 6,880.63 1.60 0.36 6,880.64 1.81 0.54 6,880.65 2.00 0.77 6,880.66 2.18 1.04 6,880.67 2.35 1.35 6,880.68 2.51 1.71 6,880.69 2.66 2.13 6,880.70 2.80 2.59 6,880.71 2.94 3.11 6,880.72 3.08 3.68 6,880.73 3.21 4.31 6,880.74 3.34 5.00 6,880.75 3.46 5.76 6,880.76 3.58 6.58 6,880.77 3.70 7.46 6,880.78 3.82 8.41 6,880.79 3.93 9.44 6,880.80 4.04 10.53 6,880.81 4.16 11.70 6,880.82 4.26 12.95 6,880.83 4.37 14.27 6,880.84 4.48 15.67 6,880.85 4.58 17.16 6,880.86 4.69 18.72 6,880.87 4.79 20.37 6,880.88 4.89 22.11 6,880.89 4.99 23.94 6,880.90 5.09 25.86 6,880.91 5.18 27.86 6,880.92 5.28 29.97 6,880.93 5.37 32.16 6,880.94 5.47 34.46 6,880.95 5.56 36.85 6,880.96 5.66 39.34 6,880.97 5.75 41.93 6,880.98 5.84 44.63 6,880.99 5.93 47.43 6,881.00 6.02 50.34 6,881.01 6.11 53.36 6,881.02 6.20 56.48 6,881.03 6.28 59.72 6,881.04 6.37 63.07 6,881.05 6.46 66.53 6,881.06 6.54 70.11 6,881.07 6.63 73.81 6,881.08 6.71 77.62 6,881.09 6.80 81.56 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 50HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 36R: Reach-10A Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,880.59 0.0 0 6,880.60 0.0 11 6,880.61 0.1 23 6,880.62 0.2 38 6,880.63 0.2 55 6,880.64 0.3 73 6,880.65 0.4 94 6,880.66 0.5 116 6,880.67 0.6 140 6,880.68 0.7 167 6,880.69 0.8 195 6,880.70 0.9 225 6,880.71 1.1 257 6,880.72 1.2 291 6,880.73 1.3 327 6,880.74 1.5 365 6,880.75 1.7 405 6,880.76 1.8 447 6,880.77 2.0 491 6,880.78 2.2 537 6,880.79 2.4 585 6,880.80 2.6 634 6,880.81 2.8 686 6,880.82 3.0 740 6,880.83 3.3 795 6,880.84 3.5 853 6,880.85 3.7 912 6,880.86 4.0 973 6,880.87 4.3 1,037 6,880.88 4.5 1,102 6,880.89 4.8 1,169 6,880.90 5.1 1,238 6,880.91 5.4 1,310 6,880.92 5.7 1,383 6,880.93 6.0 1,458 6,880.94 6.3 1,535 6,880.95 6.6 1,614 6,880.96 7.0 1,694 6,880.97 7.3 1,777 6,880.98 7.6 1,862 6,880.99 8.0 1,949 6,881.00 8.4 2,037 6,881.01 8.7 2,128 6,881.02 9.1 2,221 6,881.03 9.5 2,315 6,881.04 9.9 2,412 6,881.05 10.3 2,510 6,881.06 10.7 2,610 6,881.07 11.1 2,713 6,881.08 11.6 2,817 6,881.09 12.0 2,923 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 51HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 37R: Reach-10B [62] Hint: Exceeded Reach 36R OUTLET depth by 0.22' @ 12.23 hrs Inflow Area = 2.069 ac, 12.55% Impervious, Inflow Depth = 0.90" for 100-YR event Inflow = 1.68 cfs @ 12.21 hrs, Volume= 0.155 af Outflow = 1.64 cfs @ 12.24 hrs, Volume= 0.155 af, Atten= 2%, Lag= 2.2 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 3.51 fps, Min. Travel Time= 2.7 min Avg. Velocity = 1.52 fps, Avg. Travel Time= 6.2 min Peak Storage= 265 cf @ 12.24 hrs Average Depth at Peak Storage= 0.26' , Surface Width= 3.57' Bank-Full Depth= 1.00' Flow Area= 6.8 sf, Capacity= 58.35 cfs 0.00' x 1.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 1.9 11.7 '/' Top Width= 13.60' Length= 565.8' Slope= 0.0778 '/' Inlet Invert= 6,854.65', Outlet Invert= 6,810.65' ‡ Reach 37R: Reach-10B Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Inflow Area=2.069 ac Avg. Flow Depth=0.26' Max Vel=3.51 fps n=0.030 L=565.8' S=0.0778 '/' Capacity=58.35 cfs 1.68 cfs 1.64 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 52HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 37R: Reach-10B Primary Stage-Discharge Discharge (cfs) 5550454035302520151050Depth (feet)1 0 Reach 37R: Reach-10B Storage Stage-Storage Storage (cubic-feet) 3,5003,0002,5002,0001,5001,0005000Depth (feet)1 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 53HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 37R: Reach-10B Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,854.65 0.00 5.60 0.00 0 6,854.65 0.00 6.20 0.00 0 6,854.65 0.00 6.80 0.00 0 6,854.65 0.00 7.40 0.00 0 6,854.65 0.00 8.00 0.00 0 6,854.65 0.00 8.60 0.00 0 6,854.65 0.00 9.20 0.00 0 6,854.65 0.00 9.80 0.00 0 6,854.65 0.00 10.40 0.00 0 6,854.65 0.00 11.00 0.01 3 6,854.68 0.00 11.60 0.05 16 6,854.71 0.04 12.20 1.68 259 6,854.91 1.60 12.80 0.40 98 6,854.81 0.44 13.40 0.20 57 6,854.77 0.21 14.00 0.15 45 6,854.76 0.15 14.60 0.12 37 6,854.75 0.12 15.20 0.11 34 6,854.74 0.11 15.80 0.09 31 6,854.74 0.09 16.40 0.08 28 6,854.73 0.08 17.00 0.07 26 6,854.73 0.08 17.60 0.07 25 6,854.73 0.07 18.20 0.07 24 6,854.73 0.07 18.80 0.06 22 6,854.73 0.06 19.40 0.06 21 6,854.72 0.06 20.00 0.05 20 6,854.72 0.05 20.60 0.05 18 6,854.72 0.05 21.20 0.05 18 6,854.72 0.05 21.80 0.04 18 6,854.72 0.05 22.40 0.04 17 6,854.72 0.04 23.00 0.04 17 6,854.72 0.04 23.60 0.04 17 6,854.72 0.04 24.20 0.04 16 6,854.72 0.04 24.80 0.00 5 6,854.68 0.01 25.40 0.00 1 6,854.66 0.00 26.00 0.00 0 6,854.65 0.00 26.60 0.00 0 6,854.65 0.00 27.20 0.00 0 6,854.65 0.00 27.80 0.00 0 6,854.65 0.00 28.40 0.00 0 6,854.65 0.00 29.00 0.00 0 6,854.65 0.00 29.60 0.00 0 6,854.65 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 54HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 37R: Reach-10B Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,854.65 0.00 0.00 6,854.66 0.40 0.00 6,854.67 0.63 0.00 6,854.68 0.83 0.01 6,854.69 1.00 0.01 6,854.70 1.16 0.02 6,854.71 1.32 0.03 6,854.72 1.46 0.05 6,854.73 1.59 0.07 6,854.74 1.72 0.09 6,854.75 1.85 0.13 6,854.76 1.97 0.16 6,854.77 2.09 0.20 6,854.78 2.20 0.25 6,854.79 2.31 0.31 6,854.80 2.42 0.37 6,854.81 2.53 0.44 6,854.82 2.63 0.52 6,854.83 2.74 0.60 6,854.84 2.84 0.70 6,854.85 2.93 0.80 6,854.86 3.03 0.91 6,854.87 3.13 1.03 6,854.88 3.22 1.16 6,854.89 3.31 1.30 6,854.90 3.41 1.45 6,854.91 3.50 1.61 6,854.92 3.58 1.78 6,854.93 3.67 1.96 6,854.94 3.76 2.15 6,854.95 3.85 2.35 6,854.96 3.93 2.57 6,854.97 4.01 2.80 6,854.98 4.10 3.03 6,854.99 4.18 3.29 6,855.00 4.26 3.55 6,855.01 4.34 3.83 6,855.02 4.42 4.12 6,855.03 4.50 4.42 6,855.04 4.58 4.74 6,855.05 4.66 5.07 6,855.06 4.74 5.41 6,855.07 4.81 5.77 6,855.08 4.89 6.15 6,855.09 4.96 6.53 6,855.10 5.04 6.94 6,855.11 5.11 7.36 6,855.12 5.19 7.79 6,855.13 5.26 8.24 6,855.14 5.33 8.71 6,855.15 5.41 9.19 6,855.16 5.48 9.69 6,855.17 5.55 10.20 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,855.18 5.62 10.73 6,855.19 5.69 11.28 6,855.20 5.76 11.85 6,855.21 5.83 12.43 6,855.22 5.90 13.03 6,855.23 5.97 13.65 6,855.24 6.04 14.29 6,855.25 6.10 14.94 6,855.26 6.17 15.62 6,855.27 6.24 16.31 6,855.28 6.31 17.02 6,855.29 6.37 17.75 6,855.30 6.44 18.50 6,855.31 6.50 19.27 6,855.32 6.57 20.05 6,855.33 6.64 20.86 6,855.34 6.70 21.69 6,855.35 6.76 22.54 6,855.36 6.83 23.41 6,855.37 6.89 24.30 6,855.38 6.96 25.21 6,855.39 7.02 26.14 6,855.40 7.08 27.09 6,855.41 7.15 28.07 6,855.42 7.21 29.06 6,855.43 7.27 30.08 6,855.44 7.33 31.12 6,855.45 7.39 32.18 6,855.46 7.46 33.26 6,855.47 7.52 34.37 6,855.48 7.58 35.50 6,855.49 7.64 36.65 6,855.50 7.70 37.83 6,855.51 7.76 39.02 6,855.52 7.82 40.25 6,855.53 7.88 41.49 6,855.54 7.94 42.76 6,855.55 8.00 44.05 6,855.56 8.06 45.37 6,855.57 8.12 46.71 6,855.58 8.18 48.08 6,855.59 8.23 49.47 6,855.60 8.29 50.89 6,855.61 8.35 52.33 6,855.62 8.41 53.79 6,855.63 8.47 55.29 6,855.64 8.52 56.80 6,855.65 8.58 58.35 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 55HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 37R: Reach-10B Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,854.65 0.0 0 6,854.66 0.0 0 6,854.67 0.0 2 6,854.68 0.0 3 6,854.69 0.0 6 6,854.70 0.0 10 6,854.71 0.0 14 6,854.72 0.0 19 6,854.73 0.0 25 6,854.74 0.1 31 6,854.75 0.1 38 6,854.76 0.1 47 6,854.77 0.1 55 6,854.78 0.1 65 6,854.79 0.1 75 6,854.80 0.2 87 6,854.81 0.2 98 6,854.82 0.2 111 6,854.83 0.2 125 6,854.84 0.2 139 6,854.85 0.3 154 6,854.86 0.3 170 6,854.87 0.3 186 6,854.88 0.4 204 6,854.89 0.4 222 6,854.90 0.4 240 6,854.91 0.5 260 6,854.92 0.5 280 6,854.93 0.5 302 6,854.94 0.6 324 6,854.95 0.6 346 6,854.96 0.7 370 6,854.97 0.7 394 6,854.98 0.7 419 6,854.99 0.8 445 6,855.00 0.8 471 6,855.01 0.9 499 6,855.02 0.9 527 6,855.03 1.0 556 6,855.04 1.0 585 6,855.05 1.1 616 6,855.06 1.1 647 6,855.07 1.2 679 6,855.08 1.3 711 6,855.09 1.3 745 6,855.10 1.4 779 6,855.11 1.4 814 6,855.12 1.5 850 6,855.13 1.6 886 6,855.14 1.6 924 6,855.15 1.7 962 6,855.16 1.8 1,001 6,855.17 1.8 1,040 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,855.18 1.9 1,081 6,855.19 2.0 1,122 6,855.20 2.1 1,164 6,855.21 2.1 1,207 6,855.22 2.2 1,250 6,855.23 2.3 1,294 6,855.24 2.4 1,339 6,855.25 2.4 1,385 6,855.26 2.5 1,432 6,855.27 2.6 1,479 6,855.28 2.7 1,527 6,855.29 2.8 1,576 6,855.30 2.9 1,626 6,855.31 3.0 1,676 6,855.32 3.1 1,727 6,855.33 3.1 1,779 6,855.34 3.2 1,832 6,855.35 3.3 1,885 6,855.36 3.4 1,939 6,855.37 3.5 1,995 6,855.38 3.6 2,050 6,855.39 3.7 2,107 6,855.40 3.8 2,164 6,855.41 3.9 2,222 6,855.42 4.0 2,281 6,855.43 4.1 2,341 6,855.44 4.2 2,401 6,855.45 4.4 2,462 6,855.46 4.5 2,524 6,855.47 4.6 2,587 6,855.48 4.7 2,651 6,855.49 4.8 2,715 6,855.50 4.9 2,780 6,855.51 5.0 2,846 6,855.52 5.1 2,912 6,855.53 5.3 2,979 6,855.54 5.4 3,048 6,855.55 5.5 3,116 6,855.56 5.6 3,186 6,855.57 5.8 3,256 6,855.58 5.9 3,328 6,855.59 6.0 3,400 6,855.60 6.1 3,472 6,855.61 6.3 3,546 6,855.62 6.4 3,620 6,855.63 6.5 3,695 6,855.64 6.7 3,771 6,855.65 6.8 3,847 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 56HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Pond 12P: PRE-AREA-10-CULVERT [57] Hint: Peaked at 6,882.19' (Flood elevation advised) Inflow Area = 2.069 ac, 12.55% Impervious, Inflow Depth = 0.90" for 100-YR event Inflow = 1.68 cfs @ 12.21 hrs, Volume= 0.155 af Outflow = 1.68 cfs @ 12.21 hrs, Volume= 0.155 af, Atten= 0%, Lag= 0.0 min Primary = 0.46 cfs @ 12.21 hrs, Volume= 0.115 af Secondary = 1.22 cfs @ 12.21 hrs, Volume= 0.040 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Peak Elev= 6,882.19' @ 12.21 hrs Device Routing Invert Outlet Devices #1 Primary 6,881.48'12.0" Round Culvert w/ 9.0" inside fill L= 38.8' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 6,880.73' / 6,879.51' S= 0.0314 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 0.15 sf #2 Secondary 6,882.03'Asymmetrical Weir, C= 3.27 Offset (feet) 0.00 49.91 60.67 72.06 82.74 Height (feet) 1.24 0.00 0.23 0.82 1.24 Primary OutFlow Max=0.46 cfs @ 12.21 hrs HW=6,882.19' TW=6,880.64' (Dynamic Tailwater) 1=Culvert (Inlet Controls 0.46 cfs @ 2.97 fps) Secondary OutFlow Max=1.22 cfs @ 12.21 hrs HW=6,882.19' TW=6,854.91' (Dynamic Tailwater) 2=Asymmetrical Weir (Weir Controls 1.22 cfs @ 0.53 fps) Pond 12P: PRE-AREA-10-CULVERT Inflow Outflow Primary Secondary Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Inflow Area=2.069 ac Peak Elev=6,882.19' 1.68 cfs1.68 cfs 0.46 cfs 1.22 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 57HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Pond 12P: PRE-AREA-10-CULVERT Total Primary Secondary Stage-Discharge Discharge (cfs) 140120100806040200Elevation (feet)6,883 6,882 Culvert Asymmetrical Weir Pond 12P: PRE-AREA-10-CULVERT Storage Stage-Area-Storage Storage (acre-feet) 0Elevation (feet)6,883 6,882 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 58HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Pond 12P: PRE-AREA-10-CULVERT Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) Primary (cfs) Secondary (cfs) 5.00 0.00 6,881.48 0.00 0.00 0.00 5.60 0.00 6,881.48 0.00 0.00 0.00 6.20 0.00 6,881.48 0.00 0.00 0.00 6.80 0.00 6,881.48 0.00 0.00 0.00 7.40 0.00 6,881.48 0.00 0.00 0.00 8.00 0.00 6,881.48 0.00 0.00 0.00 8.60 0.00 6,881.48 0.00 0.00 0.00 9.20 0.00 6,881.48 0.00 0.00 0.00 9.80 0.00 6,881.48 0.00 0.00 0.00 10.40 0.00 6,881.48 0.00 0.00 0.00 11.00 0.01 6,881.51 0.01 0.01 0.00 11.60 0.06 6,881.57 0.06 0.06 0.00 12.20 1.68 6,882.19 1.68 0.46 1.22 12.80 0.39 6,882.03 0.39 0.39 0.00 13.40 0.20 6,881.71 0.20 0.20 0.00 14.00 0.15 6,881.66 0.15 0.15 0.00 14.60 0.12 6,881.63 0.12 0.12 0.00 15.20 0.11 6,881.62 0.11 0.11 0.00 15.80 0.09 6,881.61 0.09 0.09 0.00 16.40 0.08 6,881.60 0.08 0.08 0.00 17.00 0.07 6,881.59 0.07 0.07 0.00 17.60 0.07 6,881.59 0.07 0.07 0.00 18.20 0.07 6,881.58 0.07 0.07 0.00 18.80 0.06 6,881.57 0.06 0.06 0.00 19.40 0.06 6,881.57 0.06 0.06 0.00 20.00 0.05 6,881.56 0.05 0.05 0.00 20.60 0.05 6,881.56 0.05 0.05 0.00 21.20 0.05 6,881.56 0.05 0.05 0.00 21.80 0.04 6,881.56 0.04 0.04 0.00 22.40 0.04 6,881.56 0.04 0.04 0.00 23.00 0.04 6,881.55 0.04 0.04 0.00 23.60 0.04 6,881.55 0.04 0.04 0.00 24.20 0.04 6,881.55 0.04 0.04 0.00 24.80 0.00 6,881.49 0.00 0.00 0.00 25.40 0.00 6,881.48 0.00 0.00 0.00 26.00 0.00 6,881.48 0.00 0.00 0.00 26.60 0.00 6,881.48 0.00 0.00 0.00 27.20 0.00 6,881.48 0.00 0.00 0.00 27.80 0.00 6,881.48 0.00 0.00 0.00 28.40 0.00 6,881.48 0.00 0.00 0.00 29.00 0.00 6,881.48 0.00 0.00 0.00 29.60 0.00 6,881.48 0.00 0.00 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 59HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Pond 12P: PRE-AREA-10-CULVERT Elevation (feet) Discharge (cfs) Primary (cfs) Secondary (cfs) 6,881.48 0.00 0.00 0.00 6,881.50 0.01 0.01 0.00 6,881.52 0.02 0.02 0.00 6,881.54 0.03 0.03 0.00 6,881.56 0.05 0.05 0.00 6,881.58 0.07 0.07 0.00 6,881.60 0.08 0.08 0.00 6,881.62 0.10 0.10 0.00 6,881.64 0.13 0.13 0.00 6,881.66 0.15 0.15 0.00 6,881.68 0.17 0.17 0.00 6,881.70 0.19 0.19 0.00 6,881.72 0.21 0.21 0.00 6,881.74 0.23 0.23 0.00 6,881.76 0.24 0.24 0.00 6,881.78 0.26 0.26 0.00 6,881.80 0.27 0.27 0.00 6,881.82 0.28 0.28 0.00 6,881.84 0.29 0.29 0.00 6,881.86 0.31 0.31 0.00 6,881.88 0.32 0.32 0.00 6,881.90 0.33 0.33 0.00 6,881.92 0.34 0.34 0.00 6,881.94 0.35 0.35 0.00 6,881.96 0.36 0.36 0.00 6,881.98 0.37 0.37 0.00 6,882.00 0.38 0.38 0.00 6,882.02 0.38 0.38 0.00 6,882.04 0.39 0.39 0.00 6,882.06 0.42 0.40 0.02 6,882.08 0.47 0.41 0.06 6,882.10 0.57 0.42 0.15 6,882.12 0.70 0.43 0.28 6,882.14 0.89 0.44 0.46 6,882.16 1.14 0.44 0.69 6,882.18 1.44 0.45 0.99 6,882.20 1.81 0.46 1.36 6,882.22 2.26 0.47 1.79 6,882.24 2.77 0.47 2.30 6,882.26 3.37 0.48 2.89 6,882.28 4.04 0.49 3.56 6,882.30 4.79 0.49 4.30 6,882.32 5.62 0.50 5.12 6,882.34 6.53 0.51 6.03 6,882.36 7.52 0.51 7.01 6,882.38 8.59 0.52 8.07 6,882.40 9.74 0.53 9.22 6,882.42 10.98 0.53 10.45 6,882.44 12.30 0.54 11.76 6,882.46 13.71 0.55 13.16 6,882.48 15.20 0.55 14.65 6,882.50 16.78 0.56 16.23 6,882.52 18.46 0.56 17.89 Elevation (feet) Discharge (cfs) Primary (cfs) Secondary (cfs) 6,882.54 20.23 0.57 19.65 6,882.56 22.08 0.58 21.51 6,882.58 24.04 0.58 23.46 6,882.60 26.09 0.59 25.50 6,882.62 28.24 0.59 27.64 6,882.64 30.48 0.60 29.88 6,882.66 32.83 0.61 32.23 6,882.68 35.28 0.61 34.67 6,882.70 37.83 0.62 37.21 6,882.72 40.48 0.62 39.86 6,882.74 43.24 0.63 42.62 6,882.76 46.11 0.63 45.48 6,882.78 49.09 0.64 48.45 6,882.80 52.17 0.64 51.53 6,882.82 55.36 0.65 54.71 6,882.84 58.67 0.65 58.01 6,882.86 62.08 0.66 61.43 6,882.88 65.62 0.66 64.95 6,882.90 69.27 0.67 68.60 6,882.92 73.03 0.67 72.36 6,882.94 76.92 0.68 76.24 6,882.96 80.93 0.68 80.25 6,882.98 85.07 0.69 84.38 6,883.00 89.33 0.69 88.63 6,883.02 93.71 0.70 93.01 6,883.04 98.22 0.70 97.52 6,883.06 102.87 0.71 102.16 6,883.08 107.64 0.71 106.93 6,883.10 112.54 0.72 111.83 6,883.12 117.58 0.72 116.86 6,883.14 122.76 0.73 122.03 6,883.16 128.06 0.73 127.33 6,883.18 133.51 0.74 132.77 6,883.20 139.09 0.74 138.35 6,883.22 144.82 0.75 144.07 6,883.24 150.68 0.75 149.93 6,883.26 156.69 0.76 155.93 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 60HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 12P: PRE-AREA-10-CULVERT Elevation (feet) Storage (acre-feet) 6,881.48 0.000 6,881.50 0.000 6,881.52 0.000 6,881.54 0.000 6,881.56 0.000 6,881.58 0.000 6,881.60 0.000 6,881.62 0.000 6,881.64 0.000 6,881.66 0.000 6,881.68 0.000 6,881.70 0.000 6,881.72 0.000 6,881.74 0.000 6,881.76 0.000 6,881.78 0.000 6,881.80 0.000 6,881.82 0.000 6,881.84 0.000 6,881.86 0.000 6,881.88 0.000 6,881.90 0.000 6,881.92 0.000 6,881.94 0.000 6,881.96 0.000 6,881.98 0.000 6,882.00 0.000 6,882.02 0.000 6,882.04 0.000 6,882.06 0.000 6,882.08 0.000 6,882.10 0.000 6,882.12 0.000 6,882.14 0.000 6,882.16 0.000 6,882.18 0.000 6,882.20 0.000 6,882.22 0.000 6,882.24 0.000 6,882.26 0.000 6,882.28 0.000 6,882.30 0.000 6,882.32 0.000 6,882.34 0.000 6,882.36 0.000 6,882.38 0.000 6,882.40 0.000 6,882.42 0.000 6,882.44 0.000 6,882.46 0.000 6,882.48 0.000 6,882.50 0.000 6,882.52 0.000 Elevation (feet) Storage (acre-feet) 6,882.54 0.000 6,882.56 0.000 6,882.58 0.000 6,882.60 0.000 6,882.62 0.000 6,882.64 0.000 6,882.66 0.000 6,882.68 0.000 6,882.70 0.000 6,882.72 0.000 6,882.74 0.000 6,882.76 0.000 6,882.78 0.000 6,882.80 0.000 6,882.82 0.000 6,882.84 0.000 6,882.86 0.000 6,882.88 0.000 6,882.90 0.000 6,882.92 0.000 6,882.94 0.000 6,882.96 0.000 6,882.98 0.000 6,883.00 0.000 6,883.02 0.000 6,883.04 0.000 6,883.06 0.000 6,883.08 0.000 6,883.10 0.000 6,883.12 0.000 6,883.14 0.000 6,883.16 0.000 6,883.18 0.000 6,883.20 0.000 6,883.22 0.000 6,883.24 0.000 6,883.26 0.000 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 61HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment 33S: PRE-AREA-10 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 25-YR 2.21 0.96 0.094 0.55 100-YR 2.81 1.68 0.155 0.90 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 62HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment 34S: PRE-AREA-03 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 25-YR 2.21 1.22 0.100 0.45 100-YR 2.81 2.24 0.171 0.77 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 63HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 35R: Reach 03 Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 1.97 1.97 6,810.78 63 100-YR 3.59 3.59 6,810.83 96 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 64HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 36R: Reach-10A Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 0.44 0.44 6,880.63 63 100-YR 0.46 0.45 6,880.64 64 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 65HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 37R: Reach-10B Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 0.96 0.94 6,854.86 174 100-YR 1.68 1.64 6,854.91 265 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 66HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Pond 12P: PRE-AREA-10-CULVERT Event Inflow (cfs) Outflow (cfs) Primary (cfs) Secondary (cfs) Elevation (feet) Storage (acre-feet) 25-YR 0.96 0.96 0.44 0.53 6,882.15 0.000 100-YR 1.68 1.68 0.46 1.22 6,882.19 0.000 Table of Contents03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC TABLE OF CONTENTS Project Reports 1 Routing Diagram 2 Rainfall Events Listing (selected events) 3 Area Listing (selected nodes) 4 Soil Listing (selected nodes) 5 Ground Covers (selected nodes) 6 Pipe Listing (selected nodes) 25-YR Event 7 Node Listing 8 Subcat 33S: PRE-AREA-10 11 Subcat 34S: PRE-AREA-03 14 Reach 35R: Reach 03 19 Reach 36R: Reach-10A 24 Reach 37R: Reach-10B 29 Pond 12P: PRE-AREA-10-CULVERT 100-YR Event 34 Node Listing 35 Subcat 33S: PRE-AREA-10 38 Subcat 34S: PRE-AREA-03 41 Reach 35R: Reach 03 46 Reach 36R: Reach-10A 51 Reach 37R: Reach-10B 56 Pond 12P: PRE-AREA-10-CULVERT Multi-Event Tables 61 Subcat 33S: PRE-AREA-10 62 Subcat 34S: PRE-AREA-03 63 Reach 35R: Reach 03 64 Reach 36R: Reach-10A 65 Reach 37R: Reach-10B 66 Pond 12P: PRE-AREA-10-CULVERT APPENDIX B1 Post-Development 25-Year and 100-Year Hydrologic Analysis For Tributary Area-01 51S POST-AREA-01A 53S POST-AREA-01B 54S POST-AREA-01C 56S PRE-AREA-01D 62S POST-AREA-01E 56R POST-CULVERT-01B-2 57R POST-CULVERT-01B-3 59R POST-REACH-01B 61R POST-REACH-01B-4 52PCB POST-CULVERT-01A 55PCB POST-CULVERT-01B-1 58RCB POST-CULVERT-01B-4 59P Detention Basin Routing Diagram for 03385-2020-20210713 Prepared by Gamba Engineering, Printed 7/14/2021 HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcat Reach Pond Link 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 2HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 25-YR Type II 24-hr Default 24.00 1 2.21 2 2 100-YR Type II 24-hr Default 24.00 1 2.81 2 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 3HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 4.260 83 1/4 acre lots, 38% imp, HSG C (51S, 53S, 54S, 56S) 1.198 77 2 acre lots, 12% imp, HSG C (51S) 2.438 71 Meadow, non-grazed, HSG C (51S, 53S, 54S, 56S, 62S) 0.672 57 Oak/aspen range, Fair, HSG C (56S, 62S) 0.865 98 Paved parking, HSG C (51S, 53S, 54S, 56S, 62S) 9.433 79 TOTAL AREA 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 4HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Soil Listing (selected nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 9.433 HSG C 51S, 53S, 54S, 56S, 62S 0.000 HSG D 0.000 Other 9.433 TOTAL AREA 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 5HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Ground Covers (selected nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 4.260 0.000 0.000 4.260 1/4 acre lots, 38% imp 51S, 53S, 54S, 56S 0.000 0.000 1.198 0.000 0.000 1.198 2 acre lots, 12% imp 51S 0.000 0.000 2.438 0.000 0.000 2.438 Meadow, non-grazed 51S, 53S, 54S, 56S, 62S 0.000 0.000 0.672 0.000 0.000 0.672 Oak/aspen range, Fair 56S, 62S 0.000 0.000 0.865 0.000 0.000 0.865 Paved parking 51S, 53S, 54S, 56S, 62S 0.000 0.000 9.433 0.000 0.000 9.433 TOTAL AREA 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 6HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Pipe Listing (selected nodes) Line# Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) n Width (inches) Diam/Height (inches) Inside-Fill (inches) 1 56R 6,846.39 6,834.37 139.1 0.0864 0.012 0.0 18.0 0.0 2 57R 6,834.27 6,821.76 102.2 0.1224 0.012 0.0 18.0 0.0 3 52P 6,839.01 6,837.54 57.2 0.0257 0.012 0.0 12.0 0.0 4 55P 6,847.28 6,846.49 39.7 0.0199 0.012 0.0 18.0 0.0 5 58R 6,821.66 6,820.46 42.5 0.0282 0.012 0.0 24.0 0.0 6 59P 6,807.46 6,807.09 14.6 0.0253 0.012 0.0 12.0 0.0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 7HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Time span=5.00-30.00 hrs, dt=0.03 hrs, 834 points x 3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2.123 ac 24.18% Impervious Runoff Depth=0.78"Subcatchment 51S: POST-AREA-01A Flow Length=565' Tc=20.0 min CN=80 Runoff=1.76 cfs 0.137 af Runoff Area=3.410 ac 27.24% Impervious Runoff Depth=0.73"Subcatchment 53S: POST-AREA-01B Flow Length=523' Tc=13.5 min CN=79 Runoff=3.28 cfs 0.209 af Runoff Area=1.036 ac 39.02% Impervious Runoff Depth=0.92"Subcatchment 54S: POST-AREA-01C Flow Length=512' Tc=13.6 min CN=83 Runoff=1.26 cfs 0.079 af Runoff Area=1.938 ac 36.64% Impervious Runoff Depth=0.82"Subcatchment 56S: PRE-AREA-01D Flow Length=440' Tc=14.4 min CN=81 Runoff=2.04 cfs 0.133 af Runoff Area=0.926 ac 7.67% Impervious Runoff Depth=0.31"Subcatchment 62S: POST-AREA-01E Flow Length=251' Tc=39.9 min CN=66 Runoff=0.15 cfs 0.024 af Avg. Flow Depth=0.32' Max Vel=12.00 fps Inflow=3.28 cfs 0.209 afReach 56R: POST-CULVERT-01B-2 18.0" Round Pipe n=0.012 L=139.1' S=0.0864 '/' Capacity=33.45 cfs Outflow=3.28 cfs 0.209 af Avg. Flow Depth=0.34' Max Vel=14.93 fps Inflow=4.54 cfs 0.288 afReach 57R: POST-CULVERT-01B-3 18.0" Round Pipe n=0.012 L=102.2' S=0.1224 '/' Capacity=39.81 cfs Outflow=4.54 cfs 0.288 af Avg. Flow Depth=0.42' Max Vel=3.62 fps Inflow=1.76 cfs 0.137 afReach 59R: POST-REACH-01B n=0.030 L=280.8' S=0.0467 '/' Capacity=17.78 cfs Outflow=1.75 cfs 0.137 af Avg. Flow Depth=0.16' Max Vel=4.79 fps Inflow=8.05 cfs 0.558 afReach 61R: POST-REACH-01B-4 n=0.030 L=56.7' S=0.2021 '/' Capacity=112.36 cfs Outflow=8.05 cfs 0.558 af Peak Elev=6,839.73' Inflow=1.76 cfs 0.137 afPond 52P: POST-CULVERT-01A 12.0" Round Culvert n=0.012 L=57.2' S=0.0257 '/' Outflow=1.76 cfs 0.137 af Peak Elev=6,848.14' Inflow=3.28 cfs 0.209 afPond 55P: POST-CULVERT-01B-1 18.0" Round Culvert n=0.012 L=39.7' S=0.0199 '/' Outflow=3.28 cfs 0.209 af Peak Elev=6,822.93' Inflow=8.05 cfs 0.558 afPond 58R: POST-CULVERT-01B-4 24.0" Round Culvert n=0.012 L=42.5' S=0.0282 '/' Outflow=8.05 cfs 0.558 af Peak Elev=6,805.68' Storage=8,743 cf Inflow=8.09 cfs 0.582 afPond 59P: Detention Basin Primary=1.78 cfs 0.566 af Secondary=0.00 cfs 0.000 af Outflow=1.78 cfs 0.566 af Total Runoff Area = 9.433 ac Runoff Volume = 0.582 af Average Runoff Depth = 0.74" 72.15% Pervious = 6.805 ac 27.85% Impervious = 2.628 ac Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 8HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 51S: POST-AREA-01A Runoff = 1.76 cfs @ 12.14 hrs, Volume= 0.137 af, Depth= 0.78" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.15 Area (ac) CN Description 0.091 71 Meadow, non-grazed, HSG C 0.749 83 1/4 acre lots, 38% imp, HSG C 1.198 77 2 acre lots, 12% imp, HSG C 0.085 98 Paved parking, HSG C 2.123 80 Weighted Average 1.610 75.82% Pervious Area 0.513 24.18% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.4 201 0.1289 0.18 Sheet Flow, Grass Meadows Grass: Dense n= 0.240 P2= 1.33" 1.1 151 0.1143 2.37 Shallow Concentrated Flow, Grass Meadow Short Grass Pasture Kv= 7.0 fps 0.5 213 0.0597 7.36 22.08 Trap/Vee/Rect Channel Flow, New Roadside Ditch Bot.W=0.00' D=1.00' Z= 3.0 '/' Top.W=6.00' n= 0.030 Earth, grassed & winding 20.0 565 Total Subcatchment 51S: POST-AREA-01A Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Type II 24-hr 25-YR Rainfall=2.21" Ia/S=0.15 Runoff Area=2.123 ac Runoff Volume=0.137 af Runoff Depth=0.78" Flow Length=565' Tc=20.0 min CN=80 1.76 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 9HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 51S: POST-AREA-01A Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.14 0.00 0.00 5.30 0.15 0.00 0.00 5.60 0.16 0.00 0.00 5.90 0.17 0.00 0.00 6.20 0.18 0.00 0.00 6.50 0.20 0.00 0.00 6.80 0.21 0.00 0.00 7.10 0.22 0.00 0.00 7.40 0.24 0.00 0.00 7.70 0.25 0.00 0.00 8.00 0.27 0.00 0.00 8.30 0.28 0.00 0.00 8.60 0.30 0.00 0.00 8.90 0.32 0.00 0.00 9.20 0.34 0.00 0.00 9.50 0.36 0.00 0.00 9.80 0.38 0.00 0.00 10.10 0.41 0.00 0.00 10.40 0.44 0.00 0.01 10.70 0.48 0.00 0.01 11.00 0.52 0.01 0.02 11.30 0.58 0.02 0.04 11.60 0.68 0.03 0.07 11.90 1.25 0.23 0.50 12.20 1.54 0.37 1.61 12.50 1.62 0.42 0.53 12.80 1.68 0.45 0.27 13.10 1.72 0.47 0.20 13.40 1.76 0.49 0.16 13.70 1.79 0.51 0.14 14.00 1.81 0.52 0.12 14.30 1.84 0.54 0.11 14.60 1.86 0.55 0.10 14.90 1.88 0.57 0.09 15.20 1.90 0.58 0.09 15.50 1.92 0.59 0.08 15.80 1.93 0.60 0.08 16.10 1.95 0.61 0.07 16.40 1.96 0.62 0.07 16.70 1.98 0.63 0.07 17.00 1.99 0.64 0.06 17.30 2.01 0.64 0.06 17.60 2.02 0.65 0.06 17.90 2.03 0.66 0.06 18.20 2.04 0.67 0.06 18.50 2.05 0.67 0.05 18.80 2.07 0.68 0.05 19.10 2.08 0.69 0.05 19.40 2.09 0.70 0.05 19.70 2.10 0.70 0.04 20.00 2.10 0.71 0.04 20.30 2.11 0.71 0.04 20.60 2.12 0.72 0.04 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.13 0.72 0.04 21.20 2.14 0.73 0.04 21.50 2.15 0.73 0.04 21.80 2.15 0.74 0.04 22.10 2.16 0.74 0.04 22.40 2.17 0.75 0.04 22.70 2.18 0.76 0.04 23.00 2.19 0.76 0.04 23.30 2.19 0.77 0.04 23.60 2.20 0.77 0.04 23.90 2.21 0.78 0.04 24.20 2.21 0.78 0.03 24.50 2.21 0.78 0.00 24.80 2.21 0.78 0.00 25.10 2.21 0.78 0.00 25.40 2.21 0.78 0.00 25.70 2.21 0.78 0.00 26.00 2.21 0.78 0.00 26.30 2.21 0.78 0.00 26.60 2.21 0.78 0.00 26.90 2.21 0.78 0.00 27.20 2.21 0.78 0.00 27.50 2.21 0.78 0.00 27.80 2.21 0.78 0.00 28.10 2.21 0.78 0.00 28.40 2.21 0.78 0.00 28.70 2.21 0.78 0.00 29.00 2.21 0.78 0.00 29.30 2.21 0.78 0.00 29.60 2.21 0.78 0.00 29.90 2.21 0.78 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 10HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 53S: POST-AREA-01B Runoff = 3.28 cfs @ 12.06 hrs, Volume= 0.209 af, Depth= 0.73" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.15 Area (ac) CN Description 1.532 71 Meadow, non-grazed, HSG C 1.531 83 1/4 acre lots, 38% imp, HSG C 0.347 98 Paved parking, HSG C 3.410 79 Weighted Average 2.481 72.76% Pervious Area 0.929 27.24% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.8 75 0.0902 1.53 Sheet Flow, Driveway Pavement Smooth surfaces n= 0.011 P2= 1.33" 11.7 126 0.1558 0.18 Sheet Flow, Grass Meadows Grass: Dense n= 0.240 P2= 1.33" 0.4 68 0.1295 2.52 Shallow Concentrated Flow, Grass Meadow Short Grass Pasture Kv= 7.0 fps 0.6 254 0.0508 6.79 20.37 Trap/Vee/Rect Channel Flow, New Roadside Ditch Bot.W=0.00' D=1.00' Z= 3.0 '/' Top.W=6.00' n= 0.030 Earth, grassed & winding 13.5 523 Total Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 11HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcatchment 53S: POST-AREA-01B Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)3 2 1 0 Type II 24-hr 25-YR Rainfall=2.21" Ia/S=0.15 Runoff Area=3.410 ac Runoff Volume=0.209 af Runoff Depth=0.73" Flow Length=523' Tc=13.5 min CN=79 3.28 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 12HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 53S: POST-AREA-01B Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.14 0.00 0.00 5.30 0.15 0.00 0.00 5.60 0.16 0.00 0.00 5.90 0.17 0.00 0.00 6.20 0.18 0.00 0.00 6.50 0.20 0.00 0.00 6.80 0.21 0.00 0.00 7.10 0.22 0.00 0.00 7.40 0.24 0.00 0.00 7.70 0.25 0.00 0.00 8.00 0.27 0.00 0.00 8.30 0.28 0.00 0.00 8.60 0.30 0.00 0.00 8.90 0.32 0.00 0.00 9.20 0.34 0.00 0.00 9.50 0.36 0.00 0.00 9.80 0.38 0.00 0.00 10.10 0.41 0.00 0.00 10.40 0.44 0.00 0.01 10.70 0.48 0.00 0.02 11.00 0.52 0.01 0.03 11.30 0.58 0.01 0.06 11.60 0.68 0.03 0.12 11.90 1.25 0.21 1.28 12.20 1.54 0.34 1.77 12.50 1.62 0.39 0.57 12.80 1.68 0.42 0.34 13.10 1.72 0.44 0.28 13.40 1.76 0.46 0.24 13.70 1.79 0.48 0.20 14.00 1.81 0.49 0.18 14.30 1.84 0.50 0.16 14.60 1.86 0.52 0.15 14.90 1.88 0.53 0.14 15.20 1.90 0.54 0.13 15.50 1.92 0.55 0.13 15.80 1.93 0.56 0.12 16.10 1.95 0.57 0.11 16.40 1.96 0.58 0.10 16.70 1.98 0.59 0.10 17.00 1.99 0.60 0.10 17.30 2.01 0.61 0.09 17.60 2.02 0.61 0.09 17.90 2.03 0.62 0.09 18.20 2.04 0.63 0.08 18.50 2.05 0.64 0.08 18.80 2.07 0.64 0.08 19.10 2.08 0.65 0.07 19.40 2.09 0.65 0.07 19.70 2.10 0.66 0.07 20.00 2.10 0.67 0.06 20.30 2.11 0.67 0.06 20.60 2.12 0.68 0.06 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.13 0.68 0.06 21.20 2.14 0.69 0.06 21.50 2.15 0.69 0.06 21.80 2.15 0.70 0.06 22.10 2.16 0.70 0.06 22.40 2.17 0.71 0.06 22.70 2.18 0.71 0.06 23.00 2.19 0.72 0.06 23.30 2.19 0.72 0.06 23.60 2.20 0.73 0.06 23.90 2.21 0.73 0.05 24.20 2.21 0.73 0.02 24.50 2.21 0.73 0.00 24.80 2.21 0.73 0.00 25.10 2.21 0.73 0.00 25.40 2.21 0.73 0.00 25.70 2.21 0.73 0.00 26.00 2.21 0.73 0.00 26.30 2.21 0.73 0.00 26.60 2.21 0.73 0.00 26.90 2.21 0.73 0.00 27.20 2.21 0.73 0.00 27.50 2.21 0.73 0.00 27.80 2.21 0.73 0.00 28.10 2.21 0.73 0.00 28.40 2.21 0.73 0.00 28.70 2.21 0.73 0.00 29.00 2.21 0.73 0.00 29.30 2.21 0.73 0.00 29.60 2.21 0.73 0.00 29.90 2.21 0.73 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 13HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 54S: POST-AREA-01C Runoff = 1.26 cfs @ 12.06 hrs, Volume= 0.079 af, Depth= 0.92" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.15 Area (ac) CN Description 0.777 83 1/4 acre lots, 38% imp, HSG C 0.150 71 Meadow, non-grazed, HSG C 0.109 98 Paved parking, HSG C 1.036 83 Weighted Average 0.632 60.98% Pervious Area 0.404 39.02% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.6 53 0.0813 1.37 Sheet Flow, Silver King Pavement Smooth surfaces n= 0.011 P2= 1.33" 12.2 155 0.0828 0.21 Sheet Flow, Developed Yards Grass: Short n= 0.150 P2= 1.33" 0.3 81 0.0948 4.62 Shallow Concentrated Flow, Developed Yards Grassed Waterway Kv= 15.0 fps 0.5 223 0.0500 8.03 22.09 Trap/Vee/Rect Channel Flow, New Stormwater Channel Bot.W=0.00' D=1.00' Z= 2.5 & 3.0 '/' Top.W=5.50' n= 0.025 Earth, clean & winding 13.6 512 Total Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 14HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcatchment 54S: POST-AREA-01C Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Type II 24-hr 25-YR Rainfall=2.21" Ia/S=0.15 Runoff Area=1.036 ac Runoff Volume=0.079 af Runoff Depth=0.92" Flow Length=512' Tc=13.6 min CN=83 1.26 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 15HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 54S: POST-AREA-01C Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.14 0.00 0.00 5.30 0.15 0.00 0.00 5.60 0.16 0.00 0.00 5.90 0.17 0.00 0.00 6.20 0.18 0.00 0.00 6.50 0.20 0.00 0.00 6.80 0.21 0.00 0.00 7.10 0.22 0.00 0.00 7.40 0.24 0.00 0.00 7.70 0.25 0.00 0.00 8.00 0.27 0.00 0.00 8.30 0.28 0.00 0.00 8.60 0.30 0.00 0.00 8.90 0.32 0.00 0.00 9.20 0.34 0.00 0.00 9.50 0.36 0.00 0.00 9.80 0.38 0.00 0.00 10.10 0.41 0.00 0.01 10.40 0.44 0.01 0.01 10.70 0.48 0.01 0.02 11.00 0.52 0.02 0.02 11.30 0.58 0.03 0.04 11.60 0.68 0.06 0.06 11.90 1.25 0.30 0.54 12.20 1.54 0.47 0.67 12.50 1.62 0.52 0.21 12.80 1.68 0.55 0.12 13.10 1.72 0.58 0.10 13.40 1.76 0.60 0.08 13.70 1.79 0.62 0.07 14.00 1.81 0.64 0.06 14.30 1.84 0.65 0.06 14.60 1.86 0.67 0.05 14.90 1.88 0.68 0.05 15.20 1.90 0.70 0.05 15.50 1.92 0.71 0.04 15.80 1.93 0.72 0.04 16.10 1.95 0.73 0.04 16.40 1.96 0.74 0.04 16.70 1.98 0.75 0.03 17.00 1.99 0.76 0.03 17.30 2.01 0.77 0.03 17.60 2.02 0.78 0.03 17.90 2.03 0.79 0.03 18.20 2.04 0.80 0.03 18.50 2.05 0.80 0.03 18.80 2.07 0.81 0.03 19.10 2.08 0.82 0.03 19.40 2.09 0.83 0.02 19.70 2.10 0.83 0.02 20.00 2.10 0.84 0.02 20.30 2.11 0.85 0.02 20.60 2.12 0.85 0.02 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.13 0.86 0.02 21.20 2.14 0.86 0.02 21.50 2.15 0.87 0.02 21.80 2.15 0.88 0.02 22.10 2.16 0.88 0.02 22.40 2.17 0.89 0.02 22.70 2.18 0.89 0.02 23.00 2.19 0.90 0.02 23.30 2.19 0.90 0.02 23.60 2.20 0.91 0.02 23.90 2.21 0.91 0.02 24.20 2.21 0.92 0.01 24.50 2.21 0.92 0.00 24.80 2.21 0.92 0.00 25.10 2.21 0.92 0.00 25.40 2.21 0.92 0.00 25.70 2.21 0.92 0.00 26.00 2.21 0.92 0.00 26.30 2.21 0.92 0.00 26.60 2.21 0.92 0.00 26.90 2.21 0.92 0.00 27.20 2.21 0.92 0.00 27.50 2.21 0.92 0.00 27.80 2.21 0.92 0.00 28.10 2.21 0.92 0.00 28.40 2.21 0.92 0.00 28.70 2.21 0.92 0.00 29.00 2.21 0.92 0.00 29.30 2.21 0.92 0.00 29.60 2.21 0.92 0.00 29.90 2.21 0.92 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 16HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 56S: PRE-AREA-01D Runoff = 2.04 cfs @ 12.07 hrs, Volume= 0.133 af, Depth= 0.82" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.15 Area (ac) CN Description 1.203 83 1/4 acre lots, 38% imp, HSG C 0.302 71 Meadow, non-grazed, HSG C 0.180 57 Oak/aspen range, Fair, HSG C 0.253 98 Paved parking, HSG C 1.938 81 Weighted Average 1.228 63.36% Pervious Area 0.710 36.64% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.7 201 0.1042 0.24 Sheet Flow, Yards - Residential Landscaping Grass: Short n= 0.150 P2= 1.33" 0.1 24 0.2353 3.40 Shallow Concentrated Flow, Cut Slope to Roadside Ditch Short Grass Pasture Kv= 7.0 fps 0.6 215 0.0376 5.80 15.96 Trap/Vee/Rect Channel Flow, Roadside Ditch Bot.W=0.00' D=1.00' Z= 3.0 & 2.5 '/' Top.W=5.50' n= 0.030 Earth, grassed & winding 14.4 440 Total Subcatchment 56S: PRE-AREA-01D Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)2 1 0 Type II 24-hr 25-YR Rainfall=2.21" Ia/S=0.15 Runoff Area=1.938 ac Runoff Volume=0.133 af Runoff Depth=0.82" Flow Length=440' Tc=14.4 min CN=81 2.04 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 17HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 56S: PRE-AREA-01D Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.14 0.00 0.00 5.30 0.15 0.00 0.00 5.60 0.16 0.00 0.00 5.90 0.17 0.00 0.00 6.20 0.18 0.00 0.00 6.50 0.20 0.00 0.00 6.80 0.21 0.00 0.00 7.10 0.22 0.00 0.00 7.40 0.24 0.00 0.00 7.70 0.25 0.00 0.00 8.00 0.27 0.00 0.00 8.30 0.28 0.00 0.00 8.60 0.30 0.00 0.00 8.90 0.32 0.00 0.00 9.20 0.34 0.00 0.00 9.50 0.36 0.00 0.00 9.80 0.38 0.00 0.00 10.10 0.41 0.00 0.01 10.40 0.44 0.00 0.01 10.70 0.48 0.01 0.02 11.00 0.52 0.01 0.03 11.30 0.58 0.02 0.05 11.60 0.68 0.04 0.09 11.90 1.25 0.25 0.80 12.20 1.54 0.40 1.22 12.50 1.62 0.45 0.37 12.80 1.68 0.48 0.22 13.10 1.72 0.50 0.17 13.40 1.76 0.53 0.15 13.70 1.79 0.54 0.13 14.00 1.81 0.56 0.11 14.30 1.84 0.58 0.10 14.60 1.86 0.59 0.09 14.90 1.88 0.60 0.09 15.20 1.90 0.62 0.08 15.50 1.92 0.63 0.08 15.80 1.93 0.64 0.07 16.10 1.95 0.65 0.07 16.40 1.96 0.66 0.06 16.70 1.98 0.67 0.06 17.00 1.99 0.68 0.06 17.30 2.01 0.68 0.06 17.60 2.02 0.69 0.06 17.90 2.03 0.70 0.05 18.20 2.04 0.71 0.05 18.50 2.05 0.72 0.05 18.80 2.07 0.72 0.05 19.10 2.08 0.73 0.05 19.40 2.09 0.74 0.04 19.70 2.10 0.74 0.04 20.00 2.10 0.75 0.04 20.30 2.11 0.75 0.04 20.60 2.12 0.76 0.04 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.13 0.77 0.04 21.20 2.14 0.77 0.04 21.50 2.15 0.78 0.04 21.80 2.15 0.78 0.04 22.10 2.16 0.79 0.04 22.40 2.17 0.79 0.04 22.70 2.18 0.80 0.03 23.00 2.19 0.80 0.03 23.30 2.19 0.81 0.03 23.60 2.20 0.81 0.03 23.90 2.21 0.82 0.03 24.20 2.21 0.82 0.02 24.50 2.21 0.82 0.00 24.80 2.21 0.82 0.00 25.10 2.21 0.82 0.00 25.40 2.21 0.82 0.00 25.70 2.21 0.82 0.00 26.00 2.21 0.82 0.00 26.30 2.21 0.82 0.00 26.60 2.21 0.82 0.00 26.90 2.21 0.82 0.00 27.20 2.21 0.82 0.00 27.50 2.21 0.82 0.00 27.80 2.21 0.82 0.00 28.10 2.21 0.82 0.00 28.40 2.21 0.82 0.00 28.70 2.21 0.82 0.00 29.00 2.21 0.82 0.00 29.30 2.21 0.82 0.00 29.60 2.21 0.82 0.00 29.90 2.21 0.82 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 18HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 62S: POST-AREA-01E Runoff = 0.15 cfs @ 12.46 hrs, Volume= 0.024 af, Depth= 0.31" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.15 Area (ac) CN Description 0.363 71 Meadow, non-grazed, HSG C 0.492 57 Oak/aspen range, Fair, HSG C 0.071 98 Paved parking, HSG C 0.926 66 Weighted Average 0.855 92.33% Pervious Area 0.071 7.67% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.6 41 0.0647 1.19 Sheet Flow, New Road Pavement Smooth surfaces n= 0.011 P2= 1.33" 1.0 9 0.3380 0.14 Sheet Flow, New Road Fill Slope Grass: Dense n= 0.240 P2= 1.33" 37.3 150 0.1358 0.07 Sheet Flow, Oak Brush Woods: Dense underbrush n= 0.800 P2= 1.33" 1.0 51 0.0297 0.86 Shallow Concentrated Flow, Meadow Woodland Kv= 5.0 fps 39.9 251 Total Subcatchment 62S: POST-AREA-01E Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type II 24-hr 25-YR Rainfall=2.21" Ia/S=0.15 Runoff Area=0.926 ac Runoff Volume=0.024 af Runoff Depth=0.31" Flow Length=251' Tc=39.9 min CN=66 0.15 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 19HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 62S: POST-AREA-01E Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.14 0.00 0.00 5.30 0.15 0.00 0.00 5.60 0.16 0.00 0.00 5.90 0.17 0.00 0.00 6.20 0.18 0.00 0.00 6.50 0.20 0.00 0.00 6.80 0.21 0.00 0.00 7.10 0.22 0.00 0.00 7.40 0.24 0.00 0.00 7.70 0.25 0.00 0.00 8.00 0.27 0.00 0.00 8.30 0.28 0.00 0.00 8.60 0.30 0.00 0.00 8.90 0.32 0.00 0.00 9.20 0.34 0.00 0.00 9.50 0.36 0.00 0.00 9.80 0.38 0.00 0.00 10.10 0.41 0.00 0.00 10.40 0.44 0.00 0.00 10.70 0.48 0.00 0.00 11.00 0.52 0.00 0.00 11.30 0.58 0.00 0.00 11.60 0.68 0.00 0.00 11.90 1.25 0.04 0.00 12.20 1.54 0.10 0.08 12.50 1.62 0.12 0.14 12.80 1.68 0.13 0.09 13.10 1.72 0.15 0.06 13.40 1.76 0.16 0.05 13.70 1.79 0.17 0.04 14.00 1.81 0.17 0.03 14.30 1.84 0.18 0.03 14.60 1.86 0.19 0.02 14.90 1.88 0.20 0.02 15.20 1.90 0.20 0.02 15.50 1.92 0.21 0.02 15.80 1.93 0.21 0.02 16.10 1.95 0.22 0.02 16.40 1.96 0.22 0.02 16.70 1.98 0.23 0.02 17.00 1.99 0.23 0.02 17.30 2.01 0.24 0.02 17.60 2.02 0.24 0.01 17.90 2.03 0.25 0.01 18.20 2.04 0.25 0.01 18.50 2.05 0.26 0.01 18.80 2.07 0.26 0.01 19.10 2.08 0.26 0.01 19.40 2.09 0.27 0.01 19.70 2.10 0.27 0.01 20.00 2.10 0.27 0.01 20.30 2.11 0.28 0.01 20.60 2.12 0.28 0.01 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.13 0.28 0.01 21.20 2.14 0.29 0.01 21.50 2.15 0.29 0.01 21.80 2.15 0.29 0.01 22.10 2.16 0.30 0.01 22.40 2.17 0.30 0.01 22.70 2.18 0.30 0.01 23.00 2.19 0.30 0.01 23.30 2.19 0.31 0.01 23.60 2.20 0.31 0.01 23.90 2.21 0.31 0.01 24.20 2.21 0.31 0.01 24.50 2.21 0.31 0.01 24.80 2.21 0.31 0.00 25.10 2.21 0.31 0.00 25.40 2.21 0.31 0.00 25.70 2.21 0.31 0.00 26.00 2.21 0.31 0.00 26.30 2.21 0.31 0.00 26.60 2.21 0.31 0.00 26.90 2.21 0.31 0.00 27.20 2.21 0.31 0.00 27.50 2.21 0.31 0.00 27.80 2.21 0.31 0.00 28.10 2.21 0.31 0.00 28.40 2.21 0.31 0.00 28.70 2.21 0.31 0.00 29.00 2.21 0.31 0.00 29.30 2.21 0.31 0.00 29.60 2.21 0.31 0.00 29.90 2.21 0.31 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 20HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 56R: POST-CULVERT-01B-2 [52] Hint: Inlet/Outlet conditions not evaluated Inflow Area = 3.410 ac, 27.24% Impervious, Inflow Depth = 0.73" for 25-YR event Inflow = 3.28 cfs @ 12.06 hrs, Volume= 0.209 af Outflow = 3.28 cfs @ 12.06 hrs, Volume= 0.209 af, Atten= 0%, Lag= 0.1 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 12.00 fps, Min. Travel Time= 0.2 min Avg. Velocity = 4.25 fps, Avg. Travel Time= 0.5 min Peak Storage= 38 cf @ 12.06 hrs Average Depth at Peak Storage= 0.32' , Surface Width= 1.23' Bank-Full Depth= 1.50' Flow Area= 1.8 sf, Capacity= 33.45 cfs 18.0" Round Pipe n= 0.012 Corrugated PP, smooth interior Length= 139.1' Slope= 0.0864 '/' Inlet Invert= 6,846.39', Outlet Invert= 6,834.37' Reach 56R: POST-CULVERT-01B-2 Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)3 2 1 0 Inflow Area=3.410 ac Avg. Flow Depth=0.32' Max Vel=12.00 fps 18.0" Round Pipe n=0.012 L=139.1' S=0.0864 '/' Capacity=33.45 cfs 3.28 cfs3.28 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 21HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 56R: POST-CULVERT-01B-2 Primary Stage-Discharge Discharge (cfs) 35302520151050Depth (feet)1 0 Reach 56R: POST-CULVERT-01B-2 Storage Stage-Storage Storage (cubic-feet) 240220200180160140120100806040200Depth (feet)1 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 22HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 56R: POST-CULVERT-01B-2 Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,846.39 0.00 5.60 0.00 0 6,846.39 0.00 6.20 0.00 0 6,846.39 0.00 6.80 0.00 0 6,846.39 0.00 7.40 0.00 0 6,846.39 0.00 8.00 0.00 0 6,846.39 0.00 8.60 0.00 0 6,846.39 0.00 9.20 0.00 0 6,846.39 0.00 9.80 0.00 0 6,846.39 0.00 10.40 0.01 0 6,846.40 0.00 11.00 0.03 1 6,846.42 0.03 11.60 0.12 4 6,846.45 0.12 12.20 1.77 25 6,846.63 1.80 12.80 0.34 8 6,846.50 0.35 13.40 0.24 6 6,846.48 0.24 14.00 0.18 5 6,846.47 0.18 14.60 0.15 4 6,846.46 0.15 15.20 0.13 4 6,846.46 0.13 15.80 0.12 4 6,846.45 0.12 16.40 0.10 3 6,846.45 0.10 17.00 0.10 3 6,846.45 0.10 17.60 0.09 3 6,846.45 0.09 18.20 0.08 3 6,846.45 0.08 18.80 0.08 3 6,846.44 0.08 19.40 0.07 3 6,846.44 0.07 20.00 0.06 2 6,846.44 0.06 20.60 0.06 2 6,846.44 0.06 21.20 0.06 2 6,846.44 0.06 21.80 0.06 2 6,846.44 0.06 22.40 0.06 2 6,846.44 0.06 23.00 0.06 2 6,846.44 0.06 23.60 0.06 2 6,846.44 0.06 24.20 0.02 1 6,846.42 0.03 24.80 0.00 0 6,846.39 0.00 25.40 0.00 0 6,846.39 0.00 26.00 0.00 0 6,846.39 0.00 26.60 0.00 0 6,846.39 0.00 27.20 0.00 0 6,846.39 0.00 27.80 0.00 0 6,846.39 0.00 28.40 0.00 0 6,846.39 0.00 29.00 0.00 0 6,846.39 0.00 29.60 0.00 0 6,846.39 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 23HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 56R: POST-CULVERT-01B-2 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,846.39 0.00 0.00 6,846.40 1.12 0.00 6,846.41 2.01 0.01 6,846.42 2.67 0.02 6,846.43 3.21 0.04 6,846.44 3.72 0.07 6,846.45 4.20 0.10 6,846.46 4.64 0.14 6,846.47 5.07 0.19 6,846.48 5.47 0.24 6,846.49 5.86 0.30 6,846.50 6.23 0.36 6,846.51 6.59 0.44 6,846.52 6.93 0.52 6,846.53 7.27 0.61 6,846.54 7.59 0.70 6,846.55 7.91 0.80 6,846.56 8.22 0.91 6,846.57 8.52 1.02 6,846.58 8.81 1.15 6,846.59 9.09 1.28 6,846.60 9.38 1.41 6,846.61 9.65 1.55 6,846.62 9.91 1.70 6,846.63 10.18 1.86 6,846.64 10.43 2.02 6,846.65 10.68 2.19 6,846.66 10.93 2.36 6,846.67 11.17 2.55 6,846.68 11.41 2.74 6,846.69 11.64 2.93 6,846.70 11.87 3.13 6,846.71 12.10 3.34 6,846.72 12.32 3.55 6,846.73 12.53 3.77 6,846.74 12.75 4.00 6,846.75 12.96 4.23 6,846.76 13.16 4.46 6,846.77 13.36 4.71 6,846.78 13.56 4.95 6,846.79 13.76 5.21 6,846.80 13.95 5.47 6,846.81 14.14 5.73 6,846.82 14.33 6.00 6,846.83 14.51 6.27 6,846.84 14.69 6.55 6,846.85 14.87 6.84 6,846.86 15.04 7.13 6,846.87 15.22 7.42 6,846.88 15.39 7.72 6,846.89 15.55 8.02 6,846.90 15.72 8.33 6,846.91 15.88 8.64 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,846.92 16.04 8.96 6,846.93 16.19 9.27 6,846.94 16.35 9.60 6,846.95 16.50 9.93 6,846.96 16.65 10.26 6,846.97 16.79 10.59 6,846.98 16.94 10.93 6,846.99 17.08 11.27 6,847.00 17.22 11.62 6,847.01 17.35 11.97 6,847.02 17.49 12.32 6,847.03 17.62 12.67 6,847.04 17.75 13.03 6,847.05 17.88 13.39 6,847.06 18.00 13.75 6,847.07 18.13 14.12 6,847.08 18.25 14.48 6,847.09 18.37 14.85 6,847.10 18.48 15.22 6,847.11 18.60 15.60 6,847.12 18.71 15.97 6,847.13 18.82 16.35 6,847.14 18.93 16.73 6,847.15 19.04 17.11 6,847.16 19.14 17.49 6,847.17 19.24 17.87 6,847.18 19.34 18.25 6,847.19 19.44 18.63 6,847.20 19.53 19.02 6,847.21 19.63 19.40 6,847.22 19.72 19.79 6,847.23 19.81 20.17 6,847.24 19.90 20.56 6,847.25 19.98 20.94 6,847.26 20.06 21.32 6,847.27 20.14 21.71 6,847.28 20.22 22.09 6,847.29 20.30 22.47 6,847.30 20.37 22.86 6,847.31 20.45 23.24 6,847.32 20.52 23.62 6,847.33 20.59 23.99 6,847.34 20.65 24.37 6,847.35 20.72 24.74 6,847.36 20.78 25.12 6,847.37 20.84 25.49 6,847.38 20.90 25.86 6,847.39 20.95 26.22 6,847.40 21.01 26.58 6,847.41 21.06 26.95 6,847.42 21.11 27.30 6,847.43 21.15 27.66 6,847.44 21.20 28.01 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,847.45 21.24 28.35 6,847.46 21.28 28.70 6,847.47 21.32 29.04 6,847.48 21.35 29.37 6,847.49 21.38 29.70 6,847.50 21.42 30.03 6,847.51 21.44 30.34 6,847.52 21.47 30.66 6,847.53 21.49 30.97 6,847.54 21.51 31.27 6,847.55 21.53 31.57 6,847.56 21.55 31.86 6,847.57 21.56 32.15 6,847.58 21.57 32.43 6,847.59 21.58 32.70 6,847.60 21.58 32.96 6,847.61 21.58 33.22 6,847.62 21.58 33.47 6,847.63 21.57 33.70 6,847.64 21.57 33.93 6,847.65 21.55 34.16 6,847.66 21.54 34.37 6,847.67 21.52 34.57 6,847.68 21.50 34.76 6,847.69 21.47 34.94 6,847.70 21.44 35.11 6,847.71 21.41 35.26 6,847.72 21.37 35.40 6,847.73 21.33 35.53 6,847.74 21.28 35.65 6,847.75 21.23 35.75 6,847.76 21.17 35.83 6,847.77 21.11 35.90 6,847.78 21.04 35.95 6,847.79 20.96 35.97 6,847.80 20.87 35.98 6,847.81 20.78 35.96 6,847.82 20.67 35.91 6,847.83 20.56 35.84 6,847.84 20.42 35.71 6,847.85 20.27 35.55 6,847.86 20.10 35.35 6,847.87 19.87 35.02 6,847.88 19.48 34.39 6,847.89 18.93 33.45 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 24HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 56R: POST-CULVERT-01B-2 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,846.39 0.0 0 6,846.41 0.0 1 6,846.43 0.0 2 6,846.45 0.0 3 6,846.47 0.0 5 6,846.49 0.1 7 6,846.51 0.1 9 6,846.53 0.1 12 6,846.55 0.1 14 6,846.57 0.1 17 6,846.59 0.1 19 6,846.61 0.2 22 6,846.63 0.2 25 6,846.65 0.2 29 6,846.67 0.2 32 6,846.69 0.3 35 6,846.71 0.3 38 6,846.73 0.3 42 6,846.75 0.3 45 6,846.77 0.4 49 6,846.79 0.4 53 6,846.81 0.4 56 6,846.83 0.4 60 6,846.85 0.5 64 6,846.87 0.5 68 6,846.89 0.5 72 6,846.91 0.5 76 6,846.93 0.6 80 6,846.95 0.6 84 6,846.97 0.6 88 6,846.99 0.7 92 6,847.01 0.7 96 6,847.03 0.7 100 6,847.05 0.7 104 6,847.07 0.8 108 6,847.09 0.8 112 6,847.11 0.8 117 6,847.13 0.9 121 6,847.15 0.9 125 6,847.17 0.9 129 6,847.19 1.0 133 6,847.21 1.0 137 6,847.23 1.0 142 6,847.25 1.0 146 6,847.27 1.1 150 6,847.29 1.1 154 6,847.31 1.1 158 6,847.33 1.2 162 6,847.35 1.2 166 6,847.37 1.2 170 6,847.39 1.3 174 6,847.41 1.3 178 6,847.43 1.3 182 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,847.45 1.3 186 6,847.47 1.4 189 6,847.49 1.4 193 6,847.51 1.4 197 6,847.53 1.4 200 6,847.55 1.5 204 6,847.57 1.5 207 6,847.59 1.5 211 6,847.61 1.5 214 6,847.63 1.6 217 6,847.65 1.6 220 6,847.67 1.6 223 6,847.69 1.6 226 6,847.71 1.6 229 6,847.73 1.7 232 6,847.75 1.7 234 6,847.77 1.7 237 6,847.79 1.7 239 6,847.81 1.7 241 6,847.83 1.7 243 6,847.85 1.8 244 6,847.87 1.8 245 6,847.89 1.8 246 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 25HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 57R: POST-CULVERT-01B-3 [52] Hint: Inlet/Outlet conditions not evaluated [61] Hint: Exceeded Reach 56R outlet invert by 0.24' @ 12.05 hrs Inflow Area = 4.446 ac, 29.98% Impervious, Inflow Depth = 0.78" for 25-YR event Inflow = 4.54 cfs @ 12.06 hrs, Volume= 0.288 af Outflow = 4.54 cfs @ 12.06 hrs, Volume= 0.288 af, Atten= 0%, Lag= 0.1 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 14.93 fps, Min. Travel Time= 0.1 min Avg. Velocity = 5.06 fps, Avg. Travel Time= 0.3 min Peak Storage= 31 cf @ 12.06 hrs Average Depth at Peak Storage= 0.34' , Surface Width= 1.26' Bank-Full Depth= 1.50' Flow Area= 1.8 sf, Capacity= 39.81 cfs 18.0" Round Pipe n= 0.012 Corrugated PP, smooth interior Length= 102.2' Slope= 0.1224 '/' Inlet Invert= 6,834.27', Outlet Invert= 6,821.76' Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 26HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 57R: POST-CULVERT-01B-3 Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)5 4 3 2 1 0 Inflow Area=4.446 ac Avg. Flow Depth=0.34' Max Vel=14.93 fps 18.0" Round Pipe n=0.012 L=102.2' S=0.1224 '/' Capacity=39.81 cfs 4.54 cfs4.54 cfs Reach 57R: POST-CULVERT-01B-3 Primary Stage-Discharge Discharge (cfs) 4035302520151050Depth (feet)1 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 27HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 57R: POST-CULVERT-01B-3 Storage Stage-Storage Storage (cubic-feet) 180160140120100806040200Depth (feet)1 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 28HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 57R: POST-CULVERT-01B-3 Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,834.27 0.00 5.60 0.00 0 6,834.27 0.00 6.20 0.00 0 6,834.27 0.00 6.80 0.00 0 6,834.27 0.00 7.40 0.00 0 6,834.27 0.00 8.00 0.00 0 6,834.27 0.00 8.60 0.00 0 6,834.27 0.00 9.20 0.00 0 6,834.27 0.00 9.80 0.00 0 6,834.28 0.00 10.40 0.01 1 6,834.29 0.01 11.00 0.05 1 6,834.31 0.05 11.60 0.18 3 6,834.34 0.18 12.20 2.47 20 6,834.52 2.50 12.80 0.47 6 6,834.38 0.47 13.40 0.32 5 6,834.37 0.32 14.00 0.24 4 6,834.35 0.24 14.60 0.20 4 6,834.35 0.20 15.20 0.18 3 6,834.34 0.18 15.80 0.16 3 6,834.34 0.16 16.40 0.14 3 6,834.33 0.14 17.00 0.13 3 6,834.33 0.13 17.60 0.12 2 6,834.33 0.12 18.20 0.11 2 6,834.33 0.11 18.80 0.11 2 6,834.33 0.11 19.40 0.10 2 6,834.32 0.10 20.00 0.09 2 6,834.32 0.09 20.60 0.08 2 6,834.32 0.08 21.20 0.08 2 6,834.32 0.08 21.80 0.08 2 6,834.32 0.08 22.40 0.08 2 6,834.32 0.08 23.00 0.08 2 6,834.32 0.08 23.60 0.07 2 6,834.32 0.07 24.20 0.04 1 6,834.30 0.04 24.80 0.00 0 6,834.27 0.00 25.40 0.00 0 6,834.27 0.00 26.00 0.00 0 6,834.27 0.00 26.60 0.00 0 6,834.27 0.00 27.20 0.00 0 6,834.27 0.00 27.80 0.00 0 6,834.27 0.00 28.40 0.00 0 6,834.27 0.00 29.00 0.00 0 6,834.27 0.00 29.60 0.00 0 6,834.27 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 29HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 57R: POST-CULVERT-01B-3 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,834.27 0.00 0.00 6,834.28 1.34 0.00 6,834.29 2.39 0.01 6,834.30 3.17 0.03 6,834.31 3.82 0.05 6,834.32 4.43 0.08 6,834.33 5.00 0.12 6,834.34 5.53 0.17 6,834.35 6.03 0.22 6,834.36 6.51 0.28 6,834.37 6.97 0.35 6,834.38 7.41 0.43 6,834.39 7.84 0.52 6,834.40 8.25 0.62 6,834.41 8.65 0.72 6,834.42 9.04 0.83 6,834.43 9.41 0.95 6,834.44 9.78 1.08 6,834.45 10.14 1.22 6,834.46 10.48 1.37 6,834.47 10.82 1.52 6,834.48 11.16 1.68 6,834.49 11.48 1.85 6,834.50 11.80 2.03 6,834.51 12.11 2.21 6,834.52 12.42 2.41 6,834.53 12.72 2.61 6,834.54 13.01 2.81 6,834.55 13.30 3.03 6,834.56 13.58 3.26 6,834.57 13.86 3.49 6,834.58 14.13 3.73 6,834.59 14.40 3.97 6,834.60 14.66 4.23 6,834.61 14.92 4.49 6,834.62 15.17 4.76 6,834.63 15.42 5.03 6,834.64 15.66 5.31 6,834.65 15.91 5.60 6,834.66 16.14 5.89 6,834.67 16.38 6.20 6,834.68 16.60 6.50 6,834.69 16.83 6.82 6,834.70 17.05 7.14 6,834.71 17.27 7.47 6,834.72 17.49 7.80 6,834.73 17.70 8.14 6,834.74 17.91 8.48 6,834.75 18.11 8.83 6,834.76 18.31 9.19 6,834.77 18.51 9.55 6,834.78 18.71 9.91 6,834.79 18.90 10.28 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,834.80 19.09 10.66 6,834.81 19.27 11.04 6,834.82 19.45 11.42 6,834.83 19.63 11.81 6,834.84 19.81 12.21 6,834.85 19.99 12.61 6,834.86 20.16 13.01 6,834.87 20.33 13.42 6,834.88 20.49 13.83 6,834.89 20.65 14.24 6,834.90 20.81 14.66 6,834.91 20.97 15.08 6,834.92 21.13 15.51 6,834.93 21.28 15.94 6,834.94 21.43 16.37 6,834.95 21.57 16.80 6,834.96 21.72 17.24 6,834.97 21.86 17.68 6,834.98 22.00 18.12 6,834.99 22.14 18.56 6,835.00 22.27 19.01 6,835.01 22.40 19.46 6,835.02 22.53 19.91 6,835.03 22.66 20.36 6,835.04 22.78 20.81 6,835.05 22.90 21.27 6,835.06 23.02 21.72 6,835.07 23.14 22.18 6,835.08 23.25 22.63 6,835.09 23.36 23.09 6,835.10 23.47 23.55 6,835.11 23.58 24.01 6,835.12 23.68 24.46 6,835.13 23.78 24.92 6,835.14 23.88 25.38 6,835.15 23.98 25.84 6,835.16 24.07 26.29 6,835.17 24.16 26.75 6,835.18 24.25 27.20 6,835.19 24.34 27.66 6,835.20 24.42 28.11 6,835.21 24.50 28.56 6,835.22 24.58 29.00 6,835.23 24.66 29.45 6,835.24 24.73 29.89 6,835.25 24.80 30.34 6,835.26 24.87 30.77 6,835.27 24.94 31.21 6,835.28 25.00 31.64 6,835.29 25.06 32.07 6,835.30 25.12 32.49 6,835.31 25.17 32.92 6,835.32 25.23 33.33 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,835.33 25.28 33.75 6,835.34 25.33 34.15 6,835.35 25.37 34.56 6,835.36 25.41 34.95 6,835.37 25.45 35.35 6,835.38 25.49 35.74 6,835.39 25.52 36.12 6,835.40 25.55 36.49 6,835.41 25.58 36.86 6,835.42 25.60 37.22 6,835.43 25.62 37.57 6,835.44 25.64 37.92 6,835.45 25.66 38.26 6,835.46 25.67 38.59 6,835.47 25.68 38.92 6,835.48 25.68 39.23 6,835.49 25.68 39.53 6,835.50 25.68 39.83 6,835.51 25.68 40.11 6,835.52 25.67 40.39 6,835.53 25.65 40.65 6,835.54 25.64 40.90 6,835.55 25.61 41.14 6,835.56 25.59 41.37 6,835.57 25.56 41.58 6,835.58 25.52 41.78 6,835.59 25.48 41.97 6,835.60 25.44 42.14 6,835.61 25.39 42.29 6,835.62 25.33 42.43 6,835.63 25.27 42.55 6,835.64 25.20 42.65 6,835.65 25.12 42.73 6,835.66 25.04 42.78 6,835.67 24.94 42.81 6,835.68 24.84 42.83 6,835.69 24.73 42.80 6,835.70 24.60 42.74 6,835.71 24.47 42.66 6,835.72 24.30 42.51 6,835.73 24.12 42.31 6,835.74 23.92 42.07 6,835.75 23.65 41.68 6,835.76 23.19 40.93 6,835.77 22.53 39.81 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 30HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 57R: POST-CULVERT-01B-3 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,834.27 0.0 0 6,834.29 0.0 0 6,834.31 0.0 1 6,834.33 0.0 2 6,834.35 0.0 4 6,834.37 0.1 5 6,834.39 0.1 7 6,834.41 0.1 9 6,834.43 0.1 10 6,834.45 0.1 12 6,834.47 0.1 14 6,834.49 0.2 16 6,834.51 0.2 19 6,834.53 0.2 21 6,834.55 0.2 23 6,834.57 0.3 26 6,834.59 0.3 28 6,834.61 0.3 31 6,834.63 0.3 33 6,834.65 0.4 36 6,834.67 0.4 39 6,834.69 0.4 41 6,834.71 0.4 44 6,834.73 0.5 47 6,834.75 0.5 50 6,834.77 0.5 53 6,834.79 0.5 56 6,834.81 0.6 59 6,834.83 0.6 61 6,834.85 0.6 64 6,834.87 0.7 67 6,834.89 0.7 70 6,834.91 0.7 73 6,834.93 0.7 77 6,834.95 0.8 80 6,834.97 0.8 83 6,834.99 0.8 86 6,835.01 0.9 89 6,835.03 0.9 92 6,835.05 0.9 95 6,835.07 1.0 98 6,835.09 1.0 101 6,835.11 1.0 104 6,835.13 1.0 107 6,835.15 1.1 110 6,835.17 1.1 113 6,835.19 1.1 116 6,835.21 1.2 119 6,835.23 1.2 122 6,835.25 1.2 125 6,835.27 1.3 128 6,835.29 1.3 131 6,835.31 1.3 134 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,835.33 1.3 136 6,835.35 1.4 139 6,835.37 1.4 142 6,835.39 1.4 145 6,835.41 1.4 147 6,835.43 1.5 150 6,835.45 1.5 152 6,835.47 1.5 155 6,835.49 1.5 157 6,835.51 1.6 160 6,835.53 1.6 162 6,835.55 1.6 164 6,835.57 1.6 166 6,835.59 1.6 168 6,835.61 1.7 170 6,835.63 1.7 172 6,835.65 1.7 174 6,835.67 1.7 175 6,835.69 1.7 177 6,835.71 1.7 178 6,835.73 1.8 179 6,835.75 1.8 180 6,835.77 1.8 181 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 31HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 59R: POST-REACH-01B Inflow Area = 2.123 ac, 24.18% Impervious, Inflow Depth = 0.78" for 25-YR event Inflow = 1.76 cfs @ 12.14 hrs, Volume= 0.137 af Outflow = 1.75 cfs @ 12.15 hrs, Volume= 0.137 af, Atten= 1%, Lag= 1.0 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 3.62 fps, Min. Travel Time= 1.3 min Avg. Velocity = 1.52 fps, Avg. Travel Time= 3.1 min Peak Storage= 135 cf @ 12.15 hrs Average Depth at Peak Storage= 0.42' , Surface Width= 2.30' Bank-Full Depth= 1.00' Flow Area= 2.8 sf, Capacity= 17.78 cfs 0.00' x 1.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 3.0 2.5 '/' Top Width= 5.50' Length= 280.8' Slope= 0.0467 '/' Inlet Invert= 6,837.54', Outlet Invert= 6,824.43' Reach 59R: POST-REACH-01B Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Inflow Area=2.123 ac Avg. Flow Depth=0.42' Max Vel=3.62 fps n=0.030 L=280.8' S=0.0467 '/' Capacity=17.78 cfs 1.76 cfs 1.75 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 32HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 59R: POST-REACH-01B Primary Stage-Discharge Discharge (cfs) 1614121086420Depth (feet)1 0 Reach 59R: POST-REACH-01B Storage Stage-Storage Storage (cubic-feet) 750700650600550500450400350300250200150100500Depth (feet)1 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 33HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 59R: POST-REACH-01B Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,837.54 0.00 5.60 0.00 0 6,837.54 0.00 6.20 0.00 0 6,837.54 0.00 6.80 0.00 0 6,837.54 0.00 7.40 0.00 0 6,837.54 0.00 8.00 0.00 0 6,837.54 0.00 8.60 0.00 0 6,837.54 0.00 9.20 0.00 0 6,837.54 0.00 9.80 0.00 0 6,837.54 0.00 10.40 0.01 1 6,837.58 0.00 11.00 0.02 5 6,837.62 0.02 11.60 0.07 11 6,837.66 0.07 12.20 1.61 130 6,837.95 1.66 12.80 0.27 35 6,837.75 0.28 13.40 0.16 23 6,837.71 0.16 14.00 0.12 18 6,837.69 0.12 14.60 0.10 16 6,837.68 0.10 15.20 0.09 15 6,837.68 0.09 15.80 0.08 13 6,837.67 0.08 16.40 0.07 12 6,837.66 0.07 17.00 0.06 11 6,837.66 0.06 17.60 0.06 11 6,837.66 0.06 18.20 0.06 10 6,837.65 0.06 18.80 0.05 10 6,837.65 0.05 19.40 0.05 9 6,837.65 0.05 20.00 0.04 8 6,837.64 0.04 20.60 0.04 8 6,837.64 0.04 21.20 0.04 8 6,837.64 0.04 21.80 0.04 8 6,837.64 0.04 22.40 0.04 8 6,837.64 0.04 23.00 0.04 7 6,837.64 0.04 23.60 0.04 7 6,837.64 0.04 24.20 0.03 6 6,837.63 0.03 24.80 0.00 0 6,837.56 0.00 25.40 0.00 0 6,837.54 0.00 26.00 0.00 0 6,837.54 0.00 26.60 0.00 0 6,837.54 0.00 27.20 0.00 0 6,837.54 0.00 27.80 0.00 0 6,837.54 0.00 28.40 0.00 0 6,837.54 0.00 29.00 0.00 0 6,837.54 0.00 29.60 0.00 0 6,837.54 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 34HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 59R: POST-REACH-01B Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,837.54 0.00 0.00 6,837.55 0.30 0.00 6,837.56 0.48 0.00 6,837.57 0.62 0.00 6,837.58 0.76 0.00 6,837.59 0.88 0.01 6,837.60 0.99 0.01 6,837.61 1.10 0.01 6,837.62 1.20 0.02 6,837.63 1.30 0.03 6,837.64 1.39 0.04 6,837.65 1.48 0.05 6,837.66 1.57 0.06 6,837.67 1.66 0.08 6,837.68 1.74 0.09 6,837.69 1.83 0.11 6,837.70 1.91 0.13 6,837.71 1.98 0.16 6,837.72 2.06 0.18 6,837.73 2.14 0.21 6,837.74 2.21 0.24 6,837.75 2.28 0.28 6,837.76 2.36 0.31 6,837.77 2.43 0.35 6,837.78 2.50 0.40 6,837.79 2.57 0.44 6,837.80 2.63 0.49 6,837.81 2.70 0.54 6,837.82 2.77 0.60 6,837.83 2.83 0.66 6,837.84 2.90 0.72 6,837.85 2.96 0.78 6,837.86 3.03 0.85 6,837.87 3.09 0.92 6,837.88 3.15 1.00 6,837.89 3.21 1.08 6,837.90 3.27 1.17 6,837.91 3.33 1.25 6,837.92 3.39 1.35 6,837.93 3.45 1.44 6,837.94 3.51 1.54 6,837.95 3.57 1.65 6,837.96 3.63 1.76 6,837.97 3.68 1.87 6,837.98 3.74 1.99 6,837.99 3.80 2.11 6,838.00 3.85 2.24 6,838.01 3.91 2.37 6,838.02 3.96 2.51 6,838.03 4.02 2.65 6,838.04 4.07 2.80 6,838.05 4.13 2.95 6,838.06 4.18 3.11 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,838.07 4.24 3.27 6,838.08 4.29 3.44 6,838.09 4.34 3.61 6,838.10 4.39 3.79 6,838.11 4.45 3.97 6,838.12 4.50 4.16 6,838.13 4.55 4.35 6,838.14 4.60 4.55 6,838.15 4.65 4.76 6,838.16 4.70 4.97 6,838.17 4.75 5.19 6,838.18 4.80 5.41 6,838.19 4.85 5.64 6,838.20 4.90 5.87 6,838.21 4.95 6.11 6,838.22 5.00 6.36 6,838.23 5.05 6.61 6,838.24 5.10 6.87 6,838.25 5.15 7.14 6,838.26 5.20 7.41 6,838.27 5.24 7.68 6,838.28 5.29 7.97 6,838.29 5.34 8.26 6,838.30 5.39 8.55 6,838.31 5.43 8.86 6,838.32 5.48 9.17 6,838.33 5.53 9.49 6,838.34 5.57 9.81 6,838.35 5.62 10.14 6,838.36 5.67 10.48 6,838.37 5.71 10.82 6,838.38 5.76 11.17 6,838.39 5.80 11.53 6,838.40 5.85 11.90 6,838.41 5.89 12.27 6,838.42 5.94 12.65 6,838.43 5.98 13.03 6,838.44 6.03 13.43 6,838.45 6.07 13.83 6,838.46 6.12 14.24 6,838.47 6.16 14.66 6,838.48 6.21 15.08 6,838.49 6.25 15.51 6,838.50 6.29 15.95 6,838.51 6.34 16.40 6,838.52 6.38 16.85 6,838.53 6.42 17.31 6,838.54 6.47 17.78 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 35HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 59R: POST-REACH-01B Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,837.54 0.0 0 6,837.55 0.0 0 6,837.56 0.0 0 6,837.57 0.0 1 6,837.58 0.0 1 6,837.59 0.0 2 6,837.60 0.0 3 6,837.61 0.0 4 6,837.62 0.0 5 6,837.63 0.0 6 6,837.64 0.0 8 6,837.65 0.0 9 6,837.66 0.0 11 6,837.67 0.0 13 6,837.68 0.1 15 6,837.69 0.1 17 6,837.70 0.1 20 6,837.71 0.1 22 6,837.72 0.1 25 6,837.73 0.1 28 6,837.74 0.1 31 6,837.75 0.1 34 6,837.76 0.1 37 6,837.77 0.1 41 6,837.78 0.2 44 6,837.79 0.2 48 6,837.80 0.2 52 6,837.81 0.2 56 6,837.82 0.2 61 6,837.83 0.2 65 6,837.84 0.2 69 6,837.85 0.3 74 6,837.86 0.3 79 6,837.87 0.3 84 6,837.88 0.3 89 6,837.89 0.3 95 6,837.90 0.4 100 6,837.91 0.4 106 6,837.92 0.4 112 6,837.93 0.4 117 6,837.94 0.4 124 6,837.95 0.5 130 6,837.96 0.5 136 6,837.97 0.5 143 6,837.98 0.5 149 6,837.99 0.6 156 6,838.00 0.6 163 6,838.01 0.6 171 6,838.02 0.6 178 6,838.03 0.7 185 6,838.04 0.7 193 6,838.05 0.7 201 6,838.06 0.7 209 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,838.07 0.8 217 6,838.08 0.8 225 6,838.09 0.8 234 6,838.10 0.9 242 6,838.11 0.9 251 6,838.12 0.9 260 6,838.13 1.0 269 6,838.14 1.0 278 6,838.15 1.0 287 6,838.16 1.1 297 6,838.17 1.1 306 6,838.18 1.1 316 6,838.19 1.2 326 6,838.20 1.2 336 6,838.21 1.2 347 6,838.22 1.3 357 6,838.23 1.3 368 6,838.24 1.3 378 6,838.25 1.4 389 6,838.26 1.4 400 6,838.27 1.5 412 6,838.28 1.5 423 6,838.29 1.5 434 6,838.30 1.6 446 6,838.31 1.6 458 6,838.32 1.7 470 6,838.33 1.7 482 6,838.34 1.8 494 6,838.35 1.8 507 6,838.36 1.8 519 6,838.37 1.9 532 6,838.38 1.9 545 6,838.39 2.0 558 6,838.40 2.0 571 6,838.41 2.1 584 6,838.42 2.1 598 6,838.43 2.2 612 6,838.44 2.2 625 6,838.45 2.3 639 6,838.46 2.3 654 6,838.47 2.4 668 6,838.48 2.4 682 6,838.49 2.5 697 6,838.50 2.5 712 6,838.51 2.6 727 6,838.52 2.6 742 6,838.53 2.7 757 6,838.54 2.8 772 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 36HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 61R: POST-REACH-01B-4 Inflow Area = 8.507 ac, 30.05% Impervious, Inflow Depth = 0.79" for 25-YR event Inflow = 8.05 cfs @ 12.08 hrs, Volume= 0.558 af Outflow = 8.05 cfs @ 12.08 hrs, Volume= 0.558 af, Atten= 0%, Lag= 0.1 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 4.79 fps, Min. Travel Time= 0.2 min Avg. Velocity = 1.69 fps, Avg. Travel Time= 0.6 min Peak Storage= 95 cf @ 12.08 hrs Average Depth at Peak Storage= 0.16' , Surface Width= 16.89' Bank-Full Depth= 0.50' Flow Area= 12.0 sf, Capacity= 112.36 cfs 4.00' x 0.50' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 40.0 '/' Top Width= 44.00' Length= 56.7' Slope= 0.2021 '/' Inlet Invert= 6,820.46', Outlet Invert= 6,809.00' ‡ Reach 61R: POST-REACH-01B-4 Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)9 8 7 6 5 4 3 2 1 0 Inflow Area=8.507 ac Avg. Flow Depth=0.16' Max Vel=4.79 fps n=0.030 L=56.7' S=0.2021 '/' Capacity=112.36 cfs 8.05 cfs8.05 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 37HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 61R: POST-REACH-01B-4 Primary Stage-Discharge Discharge (cfs) 1101009080706050403020100Depth (feet)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Reach 61R: POST-REACH-01B-4 Storage Stage-Storage Storage (cubic-feet) 650600550500450400350300250200150100500Depth (feet)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 38HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 61R: POST-REACH-01B-4 Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,820.46 0.00 5.60 0.00 0 6,820.46 0.00 6.20 0.00 0 6,820.46 0.00 6.80 0.00 0 6,820.46 0.00 7.40 0.00 0 6,820.46 0.00 8.00 0.00 0 6,820.46 0.00 8.60 0.00 0 6,820.46 0.00 9.20 0.00 0 6,820.46 0.00 9.80 0.01 1 6,820.46 0.01 10.40 0.03 2 6,820.47 0.03 11.00 0.10 4 6,820.48 0.10 11.60 0.33 10 6,820.49 0.33 12.20 5.37 72 6,820.59 5.45 12.80 0.97 21 6,820.52 0.97 13.40 0.63 15 6,820.51 0.63 14.00 0.48 12 6,820.50 0.48 14.60 0.40 11 6,820.50 0.40 15.20 0.35 10 6,820.49 0.35 15.80 0.31 9 6,820.49 0.31 16.40 0.27 8 6,820.49 0.27 17.00 0.25 8 6,820.49 0.25 17.60 0.24 8 6,820.49 0.24 18.20 0.22 7 6,820.49 0.22 18.80 0.20 7 6,820.48 0.20 19.40 0.19 7 6,820.48 0.19 20.00 0.17 6 6,820.48 0.17 20.60 0.16 6 6,820.48 0.16 21.20 0.16 6 6,820.48 0.16 21.80 0.15 6 6,820.48 0.15 22.40 0.15 6 6,820.48 0.15 23.00 0.15 6 6,820.48 0.15 23.60 0.14 5 6,820.48 0.14 24.20 0.08 4 6,820.48 0.09 24.80 0.00 0 6,820.46 0.00 25.40 0.00 0 6,820.46 0.00 26.00 0.00 0 6,820.46 0.00 26.60 0.00 0 6,820.46 0.00 27.20 0.00 0 6,820.46 0.00 27.80 0.00 0 6,820.46 0.00 28.40 0.00 0 6,820.46 0.00 29.00 0.00 0 6,820.46 0.00 29.60 0.00 0 6,820.46 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 39HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 61R: POST-REACH-01B-4 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,820.46 0.00 0.00 6,820.47 0.98 0.04 6,820.48 1.48 0.14 6,820.49 1.87 0.29 6,820.50 2.20 0.49 6,820.51 2.49 0.75 6,820.52 2.76 1.06 6,820.53 3.01 1.43 6,820.54 3.24 1.86 6,820.55 3.45 2.36 6,820.56 3.66 2.93 6,820.57 3.86 3.57 6,820.58 4.05 4.28 6,820.59 4.24 5.07 6,820.60 4.42 5.94 6,820.61 4.59 6.89 6,820.62 4.77 7.93 6,820.63 4.93 9.06 6,820.64 5.10 10.28 6,820.65 5.26 11.59 6,820.66 5.42 13.00 6,820.67 5.57 14.51 6,820.68 5.72 16.12 6,820.69 5.87 17.84 6,820.70 6.02 19.66 6,820.71 6.17 21.59 6,820.72 6.31 23.63 6,820.73 6.45 25.79 6,820.74 6.60 28.07 6,820.75 6.73 30.46 6,820.76 6.87 32.98 6,820.77 7.01 35.62 6,820.78 7.14 38.39 6,820.79 7.27 41.28 6,820.80 7.40 44.31 6,820.81 7.53 47.47 6,820.82 7.66 50.77 6,820.83 7.79 54.20 6,820.84 7.92 57.77 6,820.85 8.04 61.49 6,820.86 8.17 65.35 6,820.87 8.29 69.35 6,820.88 8.41 73.51 6,820.89 8.54 77.82 6,820.90 8.66 82.28 6,820.91 8.78 86.89 6,820.92 8.90 91.66 6,820.93 9.01 96.59 6,820.94 9.13 101.68 6,820.95 9.25 106.94 6,820.96 9.36 112.36 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 40HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 61R: POST-REACH-01B-4 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,820.46 0.0 0 6,820.47 0.0 2 6,820.48 0.1 5 6,820.49 0.2 9 6,820.50 0.2 13 6,820.51 0.3 17 6,820.52 0.4 22 6,820.53 0.5 27 6,820.54 0.6 33 6,820.55 0.7 39 6,820.56 0.8 45 6,820.57 0.9 52 6,820.58 1.1 60 6,820.59 1.2 68 6,820.60 1.3 76 6,820.61 1.5 85 6,820.62 1.7 94 6,820.63 1.8 104 6,820.64 2.0 114 6,820.65 2.2 125 6,820.66 2.4 136 6,820.67 2.6 148 6,820.68 2.8 160 6,820.69 3.0 172 6,820.70 3.3 185 6,820.71 3.5 198 6,820.72 3.7 212 6,820.73 4.0 227 6,820.74 4.3 241 6,820.75 4.5 257 6,820.76 4.8 272 6,820.77 5.1 288 6,820.78 5.4 305 6,820.79 5.7 322 6,820.80 6.0 339 6,820.81 6.3 357 6,820.82 6.6 376 6,820.83 7.0 394 6,820.84 7.3 414 6,820.85 7.6 433 6,820.86 8.0 454 6,820.87 8.4 474 6,820.88 8.7 495 6,820.89 9.1 517 6,820.90 9.5 539 6,820.91 9.9 561 6,820.92 10.3 584 6,820.93 10.7 608 6,820.94 11.1 631 6,820.95 11.6 656 6,820.96 12.0 680 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 41HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Pond 52P: POST-CULVERT-01A [57] Hint: Peaked at 6,839.73' (Flood elevation advised) Inflow Area = 2.123 ac, 24.18% Impervious, Inflow Depth = 0.78" for 25-YR event Inflow = 1.76 cfs @ 12.14 hrs, Volume= 0.137 af Outflow = 1.76 cfs @ 12.14 hrs, Volume= 0.137 af, Atten= 0%, Lag= 0.0 min Primary = 1.76 cfs @ 12.14 hrs, Volume= 0.137 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Peak Elev= 6,839.73' @ 12.14 hrs Device Routing Invert Outlet Devices #1 Primary 6,839.01'12.0" Round Culvert L= 57.2' CPP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 6,839.01' / 6,837.54' S= 0.0257 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 0.79 sf Primary OutFlow Max=1.75 cfs @ 12.14 hrs HW=6,839.73' TW=6,837.96' (Dynamic Tailwater) 1=Culvert (Inlet Controls 1.75 cfs @ 2.89 fps) Pond 52P: POST-CULVERT-01A Inflow Primary Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Inflow Area=2.123 ac Peak Elev=6,839.73' 12.0" Round Culvert n=0.012 L=57.2' S=0.0257 '/' 1.76 cfs1.76 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 42HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Pond 52P: POST-CULVERT-01A Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)6,840 Culvert Pond 52P: POST-CULVERT-01A Storage Stage-Area-Storage Storage (acre-feet) 0Elevation (feet)6,840 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 43HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Pond 52P: POST-CULVERT-01A Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 5.00 0.00 6,839.01 0.00 5.30 0.00 6,839.01 0.00 5.60 0.00 6,839.01 0.00 5.90 0.00 6,839.01 0.00 6.20 0.00 6,839.01 0.00 6.50 0.00 6,839.01 0.00 6.80 0.00 6,839.01 0.00 7.10 0.00 6,839.01 0.00 7.40 0.00 6,839.01 0.00 7.70 0.00 6,839.01 0.00 8.00 0.00 6,839.01 0.00 8.30 0.00 6,839.01 0.00 8.60 0.00 6,839.01 0.00 8.90 0.00 6,839.01 0.00 9.20 0.00 6,839.01 0.00 9.50 0.00 6,839.01 0.00 9.80 0.00 6,839.01 0.00 10.10 0.00 6,839.03 0.00 10.40 0.01 6,839.04 0.01 10.70 0.01 6,839.06 0.01 11.00 0.02 6,839.08 0.02 11.30 0.04 6,839.10 0.04 11.60 0.07 6,839.14 0.07 11.90 0.50 6,839.36 0.50 12.20 1.61 6,839.69 1.61 12.50 0.53 6,839.38 0.53 12.80 0.27 6,839.26 0.27 13.10 0.20 6,839.22 0.20 13.40 0.16 6,839.20 0.16 13.70 0.14 6,839.19 0.14 14.00 0.12 6,839.18 0.12 14.30 0.11 6,839.17 0.11 14.60 0.10 6,839.16 0.10 14.90 0.09 6,839.16 0.09 15.20 0.09 6,839.15 0.09 15.50 0.08 6,839.15 0.08 15.80 0.08 6,839.14 0.08 16.10 0.07 6,839.14 0.07 16.40 0.07 6,839.13 0.07 16.70 0.07 6,839.13 0.07 17.00 0.06 6,839.13 0.06 17.30 0.06 6,839.13 0.06 17.60 0.06 6,839.13 0.06 17.90 0.06 6,839.12 0.06 18.20 0.06 6,839.12 0.06 18.50 0.05 6,839.12 0.05 18.80 0.05 6,839.12 0.05 19.10 0.05 6,839.12 0.05 19.40 0.05 6,839.11 0.05 19.70 0.04 6,839.11 0.04 20.00 0.04 6,839.11 0.04 20.30 0.04 6,839.11 0.04 20.60 0.04 6,839.10 0.04 Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 20.90 0.04 6,839.10 0.04 21.20 0.04 6,839.10 0.04 21.50 0.04 6,839.10 0.04 21.80 0.04 6,839.10 0.04 22.10 0.04 6,839.10 0.04 22.40 0.04 6,839.10 0.04 22.70 0.04 6,839.10 0.04 23.00 0.04 6,839.10 0.04 23.30 0.04 6,839.10 0.04 23.60 0.04 6,839.10 0.04 23.90 0.04 6,839.10 0.04 24.20 0.03 6,839.09 0.03 24.50 0.00 6,839.04 0.00 24.80 0.00 6,839.02 0.00 25.10 0.00 6,839.01 0.00 25.40 0.00 6,839.01 0.00 25.70 0.00 6,839.01 0.00 26.00 0.00 6,839.01 0.00 26.30 0.00 6,839.01 0.00 26.60 0.00 6,839.01 0.00 26.90 0.00 6,839.01 0.00 27.20 0.00 6,839.01 0.00 27.50 0.00 6,839.01 0.00 27.80 0.00 6,839.01 0.00 28.10 0.00 6,839.01 0.00 28.40 0.00 6,839.01 0.00 28.70 0.00 6,839.01 0.00 29.00 0.00 6,839.01 0.00 29.30 0.00 6,839.01 0.00 29.60 0.00 6,839.01 0.00 29.90 0.00 6,839.01 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 44HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Pond 52P: POST-CULVERT-01A Elevation (feet) Primary (cfs) 6,839.01 0.00 6,839.02 0.00 6,839.03 0.00 6,839.04 0.00 6,839.05 0.01 6,839.06 0.01 6,839.07 0.02 6,839.08 0.02 6,839.09 0.03 6,839.10 0.04 6,839.11 0.04 6,839.12 0.05 6,839.13 0.06 6,839.14 0.07 6,839.15 0.09 6,839.16 0.10 6,839.17 0.11 6,839.18 0.12 6,839.19 0.14 6,839.20 0.15 6,839.21 0.17 6,839.22 0.19 6,839.23 0.20 6,839.24 0.22 6,839.25 0.24 6,839.26 0.26 6,839.27 0.28 6,839.28 0.30 6,839.29 0.32 6,839.30 0.35 6,839.31 0.37 6,839.32 0.39 6,839.33 0.42 6,839.34 0.44 6,839.35 0.47 6,839.36 0.49 6,839.37 0.52 6,839.38 0.55 6,839.39 0.57 6,839.40 0.60 6,839.41 0.63 6,839.42 0.66 6,839.43 0.69 6,839.44 0.72 6,839.45 0.75 6,839.46 0.78 6,839.47 0.81 6,839.48 0.85 6,839.49 0.88 6,839.50 0.91 6,839.51 0.95 6,839.52 0.98 6,839.53 1.01 Elevation (feet) Primary (cfs) 6,839.54 1.05 6,839.55 1.08 6,839.56 1.12 6,839.57 1.15 6,839.58 1.19 6,839.59 1.22 6,839.60 1.26 6,839.61 1.30 6,839.62 1.33 6,839.63 1.37 6,839.64 1.41 6,839.65 1.45 6,839.66 1.48 6,839.67 1.52 6,839.68 1.56 6,839.69 1.60 6,839.70 1.63 6,839.71 1.67 6,839.72 1.71 6,839.73 1.75 6,839.74 1.79 6,839.75 1.83 6,839.76 1.86 6,839.77 1.90 6,839.78 1.94 6,839.79 1.98 6,839.80 2.01 6,839.81 2.05 6,839.82 2.09 6,839.83 2.13 6,839.84 2.16 6,839.85 2.20 6,839.86 2.23 6,839.87 2.27 6,839.88 2.30 6,839.89 2.34 6,839.90 2.37 6,839.91 2.40 6,839.92 2.44 6,839.93 2.47 6,839.94 2.50 6,839.95 2.53 6,839.96 2.56 6,839.97 2.58 6,839.98 2.61 6,839.99 2.63 6,840.00 2.66 6,840.01 2.67 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 45HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 52P: POST-CULVERT-01A Elevation (feet) Storage (acre-feet) 6,839.01 0.000 6,839.02 0.000 6,839.03 0.000 6,839.04 0.000 6,839.05 0.000 6,839.06 0.000 6,839.07 0.000 6,839.08 0.000 6,839.09 0.000 6,839.10 0.000 6,839.11 0.000 6,839.12 0.000 6,839.13 0.000 6,839.14 0.000 6,839.15 0.000 6,839.16 0.000 6,839.17 0.000 6,839.18 0.000 6,839.19 0.000 6,839.20 0.000 6,839.21 0.000 6,839.22 0.000 6,839.23 0.000 6,839.24 0.000 6,839.25 0.000 6,839.26 0.000 6,839.27 0.000 6,839.28 0.000 6,839.29 0.000 6,839.30 0.000 6,839.31 0.000 6,839.32 0.000 6,839.33 0.000 6,839.34 0.000 6,839.35 0.000 6,839.36 0.000 6,839.37 0.000 6,839.38 0.000 6,839.39 0.000 6,839.40 0.000 6,839.41 0.000 6,839.42 0.000 6,839.43 0.000 6,839.44 0.000 6,839.45 0.000 6,839.46 0.000 6,839.47 0.000 6,839.48 0.000 6,839.49 0.000 6,839.50 0.000 6,839.51 0.000 6,839.52 0.000 6,839.53 0.000 Elevation (feet) Storage (acre-feet) 6,839.54 0.000 6,839.55 0.000 6,839.56 0.000 6,839.57 0.000 6,839.58 0.000 6,839.59 0.000 6,839.60 0.000 6,839.61 0.000 6,839.62 0.000 6,839.63 0.000 6,839.64 0.000 6,839.65 0.000 6,839.66 0.000 6,839.67 0.000 6,839.68 0.000 6,839.69 0.000 6,839.70 0.000 6,839.71 0.000 6,839.72 0.000 6,839.73 0.000 6,839.74 0.000 6,839.75 0.000 6,839.76 0.000 6,839.77 0.000 6,839.78 0.000 6,839.79 0.000 6,839.80 0.000 6,839.81 0.000 6,839.82 0.000 6,839.83 0.000 6,839.84 0.000 6,839.85 0.000 6,839.86 0.000 6,839.87 0.000 6,839.88 0.000 6,839.89 0.000 6,839.90 0.000 6,839.91 0.000 6,839.92 0.000 6,839.93 0.000 6,839.94 0.000 6,839.95 0.000 6,839.96 0.000 6,839.97 0.000 6,839.98 0.000 6,839.99 0.000 6,840.00 0.000 6,840.01 0.000 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 46HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Pond 55P: POST-CULVERT-01B-1 [57] Hint: Peaked at 6,848.14' (Flood elevation advised) Inflow Area = 3.410 ac, 27.24% Impervious, Inflow Depth = 0.73" for 25-YR event Inflow = 3.28 cfs @ 12.06 hrs, Volume= 0.209 af Outflow = 3.28 cfs @ 12.06 hrs, Volume= 0.209 af, Atten= 0%, Lag= 0.0 min Primary = 3.28 cfs @ 12.06 hrs, Volume= 0.209 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Peak Elev= 6,848.14' @ 12.06 hrs Device Routing Invert Outlet Devices #1 Primary 6,847.28'18.0" Round Culvert L= 39.7' CPP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 6,847.28' / 6,846.49' S= 0.0199 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 1.77 sf Primary OutFlow Max=3.25 cfs @ 12.06 hrs HW=6,848.13' TW=6,846.71' (Dynamic Tailwater) 1=Culvert (Inlet Controls 3.25 cfs @ 3.14 fps) Pond 55P: POST-CULVERT-01B-1 Inflow Primary Hydrograph Time (hours) 2826242220181614121086Flow (cfs)3 2 1 0 Inflow Area=3.410 ac Peak Elev=6,848.14' 18.0" Round Culvert n=0.012 L=39.7' S=0.0199 '/' 3.28 cfs3.28 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 47HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Pond 55P: POST-CULVERT-01B-1 Primary Stage-Discharge Discharge (cfs) 76543210Elevation (feet)6,848 Culvert Pond 55P: POST-CULVERT-01B-1 Storage Stage-Area-Storage Storage (acre-feet) 0Elevation (feet)6,848 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 48HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Pond 55P: POST-CULVERT-01B-1 Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 5.00 0.00 6,847.28 0.00 5.30 0.00 6,847.28 0.00 5.60 0.00 6,847.28 0.00 5.90 0.00 6,847.28 0.00 6.20 0.00 6,847.28 0.00 6.50 0.00 6,847.28 0.00 6.80 0.00 6,847.28 0.00 7.10 0.00 6,847.28 0.00 7.40 0.00 6,847.28 0.00 7.70 0.00 6,847.28 0.00 8.00 0.00 6,847.28 0.00 8.30 0.00 6,847.28 0.00 8.60 0.00 6,847.28 0.00 8.90 0.00 6,847.28 0.00 9.20 0.00 6,847.28 0.00 9.50 0.00 6,847.28 0.00 9.80 0.00 6,847.28 0.00 10.10 0.00 6,847.28 0.00 10.40 0.01 6,847.31 0.01 10.70 0.02 6,847.33 0.02 11.00 0.03 6,847.36 0.03 11.30 0.06 6,847.38 0.06 11.60 0.12 6,847.43 0.12 11.90 1.28 6,847.79 1.28 12.20 1.77 6,847.89 1.77 12.50 0.57 6,847.61 0.57 12.80 0.34 6,847.54 0.34 13.10 0.28 6,847.51 0.28 13.40 0.24 6,847.49 0.24 13.70 0.20 6,847.48 0.20 14.00 0.18 6,847.46 0.18 14.30 0.16 6,847.45 0.16 14.60 0.15 6,847.45 0.15 14.90 0.14 6,847.44 0.14 15.20 0.13 6,847.44 0.13 15.50 0.13 6,847.43 0.13 15.80 0.12 6,847.43 0.12 16.10 0.11 6,847.42 0.11 16.40 0.10 6,847.42 0.10 16.70 0.10 6,847.42 0.10 17.00 0.10 6,847.41 0.10 17.30 0.09 6,847.41 0.09 17.60 0.09 6,847.41 0.09 17.90 0.09 6,847.41 0.09 18.20 0.08 6,847.40 0.08 18.50 0.08 6,847.40 0.08 18.80 0.08 6,847.40 0.08 19.10 0.07 6,847.40 0.07 19.40 0.07 6,847.39 0.07 19.70 0.07 6,847.39 0.07 20.00 0.06 6,847.39 0.06 20.30 0.06 6,847.39 0.06 20.60 0.06 6,847.39 0.06 Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 20.90 0.06 6,847.39 0.06 21.20 0.06 6,847.39 0.06 21.50 0.06 6,847.38 0.06 21.80 0.06 6,847.38 0.06 22.10 0.06 6,847.38 0.06 22.40 0.06 6,847.38 0.06 22.70 0.06 6,847.38 0.06 23.00 0.06 6,847.38 0.06 23.30 0.06 6,847.38 0.06 23.60 0.06 6,847.38 0.06 23.90 0.05 6,847.38 0.05 24.20 0.02 6,847.35 0.02 24.50 0.00 6,847.29 0.00 24.80 0.00 6,847.28 0.00 25.10 0.00 6,847.28 0.00 25.40 0.00 6,847.28 0.00 25.70 0.00 6,847.28 0.00 26.00 0.00 6,847.28 0.00 26.30 0.00 6,847.28 0.00 26.60 0.00 6,847.28 0.00 26.90 0.00 6,847.28 0.00 27.20 0.00 6,847.28 0.00 27.50 0.00 6,847.28 0.00 27.80 0.00 6,847.28 0.00 28.10 0.00 6,847.28 0.00 28.40 0.00 6,847.28 0.00 28.70 0.00 6,847.28 0.00 29.00 0.00 6,847.28 0.00 29.30 0.00 6,847.28 0.00 29.60 0.00 6,847.28 0.00 29.90 0.00 6,847.28 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 49HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Pond 55P: POST-CULVERT-01B-1 Elevation (feet) Primary (cfs) 6,847.28 0.00 6,847.29 0.00 6,847.30 0.00 6,847.31 0.00 6,847.32 0.01 6,847.33 0.01 6,847.34 0.02 6,847.35 0.03 6,847.36 0.04 6,847.37 0.04 6,847.38 0.05 6,847.39 0.07 6,847.40 0.08 6,847.41 0.09 6,847.42 0.11 6,847.43 0.12 6,847.44 0.14 6,847.45 0.16 6,847.46 0.17 6,847.47 0.19 6,847.48 0.21 6,847.49 0.23 6,847.50 0.26 6,847.51 0.28 6,847.52 0.30 6,847.53 0.33 6,847.54 0.36 6,847.55 0.38 6,847.56 0.41 6,847.57 0.44 6,847.58 0.47 6,847.59 0.50 6,847.60 0.53 6,847.61 0.56 6,847.62 0.60 6,847.63 0.63 6,847.64 0.67 6,847.65 0.70 6,847.66 0.74 6,847.67 0.78 6,847.68 0.81 6,847.69 0.85 6,847.70 0.89 6,847.71 0.93 6,847.72 0.98 6,847.73 1.02 6,847.74 1.06 6,847.75 1.11 6,847.76 1.15 6,847.77 1.20 6,847.78 1.24 6,847.79 1.29 6,847.80 1.34 Elevation (feet) Primary (cfs) 6,847.81 1.38 6,847.82 1.43 6,847.83 1.48 6,847.84 1.53 6,847.85 1.58 6,847.86 1.64 6,847.87 1.69 6,847.88 1.74 6,847.89 1.79 6,847.90 1.85 6,847.91 1.90 6,847.92 1.96 6,847.93 2.01 6,847.94 2.07 6,847.95 2.13 6,847.96 2.19 6,847.97 2.24 6,847.98 2.30 6,847.99 2.36 6,848.00 2.42 6,848.01 2.48 6,848.02 2.54 6,848.03 2.61 6,848.04 2.67 6,848.05 2.73 6,848.06 2.79 6,848.07 2.86 6,848.08 2.92 6,848.09 2.98 6,848.10 3.05 6,848.11 3.11 6,848.12 3.18 6,848.13 3.24 6,848.14 3.31 6,848.15 3.38 6,848.16 3.44 6,848.17 3.51 6,848.18 3.58 6,848.19 3.64 6,848.20 3.71 6,848.21 3.78 6,848.22 3.85 6,848.23 3.92 6,848.24 3.98 6,848.25 4.05 6,848.26 4.12 6,848.27 4.19 6,848.28 4.26 6,848.29 4.33 6,848.30 4.40 6,848.31 4.47 6,848.32 4.54 6,848.33 4.61 Elevation (feet) Primary (cfs) 6,848.34 4.68 6,848.35 4.75 6,848.36 4.82 6,848.37 4.89 6,848.38 4.96 6,848.39 5.03 6,848.40 5.10 6,848.41 5.17 6,848.42 5.24 6,848.43 5.31 6,848.44 5.38 6,848.45 5.45 6,848.46 5.52 6,848.47 5.58 6,848.48 5.65 6,848.49 5.72 6,848.50 5.79 6,848.51 5.86 6,848.52 5.92 6,848.53 5.99 6,848.54 6.06 6,848.55 6.12 6,848.56 6.19 6,848.57 6.25 6,848.58 6.32 6,848.59 6.38 6,848.60 6.44 6,848.61 6.50 6,848.62 6.57 6,848.63 6.63 6,848.64 6.69 6,848.65 6.75 6,848.66 6.80 6,848.67 6.86 6,848.68 6.92 6,848.69 6.97 6,848.70 7.02 6,848.71 7.07 6,848.72 7.12 6,848.73 7.17 6,848.74 7.22 6,848.75 7.26 6,848.76 7.30 6,848.77 7.34 6,848.78 7.37 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 50HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 55P: POST-CULVERT-01B-1 Elevation (feet) Storage (acre-feet) 6,847.28 0.000 6,847.29 0.000 6,847.30 0.000 6,847.31 0.000 6,847.32 0.000 6,847.33 0.000 6,847.34 0.000 6,847.35 0.000 6,847.36 0.000 6,847.37 0.000 6,847.38 0.000 6,847.39 0.000 6,847.40 0.000 6,847.41 0.000 6,847.42 0.000 6,847.43 0.000 6,847.44 0.000 6,847.45 0.000 6,847.46 0.000 6,847.47 0.000 6,847.48 0.000 6,847.49 0.000 6,847.50 0.000 6,847.51 0.000 6,847.52 0.000 6,847.53 0.000 6,847.54 0.000 6,847.55 0.000 6,847.56 0.000 6,847.57 0.000 6,847.58 0.000 6,847.59 0.000 6,847.60 0.000 6,847.61 0.000 6,847.62 0.000 6,847.63 0.000 6,847.64 0.000 6,847.65 0.000 6,847.66 0.000 6,847.67 0.000 6,847.68 0.000 6,847.69 0.000 6,847.70 0.000 6,847.71 0.000 6,847.72 0.000 6,847.73 0.000 6,847.74 0.000 6,847.75 0.000 6,847.76 0.000 6,847.77 0.000 6,847.78 0.000 6,847.79 0.000 6,847.80 0.000 Elevation (feet) Storage (acre-feet) 6,847.81 0.000 6,847.82 0.000 6,847.83 0.000 6,847.84 0.000 6,847.85 0.000 6,847.86 0.000 6,847.87 0.000 6,847.88 0.000 6,847.89 0.000 6,847.90 0.000 6,847.91 0.000 6,847.92 0.000 6,847.93 0.000 6,847.94 0.000 6,847.95 0.000 6,847.96 0.000 6,847.97 0.000 6,847.98 0.000 6,847.99 0.000 6,848.00 0.000 6,848.01 0.000 6,848.02 0.000 6,848.03 0.000 6,848.04 0.000 6,848.05 0.000 6,848.06 0.000 6,848.07 0.000 6,848.08 0.000 6,848.09 0.000 6,848.10 0.000 6,848.11 0.000 6,848.12 0.000 6,848.13 0.000 6,848.14 0.000 6,848.15 0.000 6,848.16 0.000 6,848.17 0.000 6,848.18 0.000 6,848.19 0.000 6,848.20 0.000 6,848.21 0.000 6,848.22 0.000 6,848.23 0.000 6,848.24 0.000 6,848.25 0.000 6,848.26 0.000 6,848.27 0.000 6,848.28 0.000 6,848.29 0.000 6,848.30 0.000 6,848.31 0.000 6,848.32 0.000 6,848.33 0.000 Elevation (feet) Storage (acre-feet) 6,848.34 0.000 6,848.35 0.000 6,848.36 0.000 6,848.37 0.000 6,848.38 0.000 6,848.39 0.000 6,848.40 0.000 6,848.41 0.000 6,848.42 0.000 6,848.43 0.000 6,848.44 0.000 6,848.45 0.000 6,848.46 0.000 6,848.47 0.000 6,848.48 0.000 6,848.49 0.000 6,848.50 0.000 6,848.51 0.000 6,848.52 0.000 6,848.53 0.000 6,848.54 0.000 6,848.55 0.000 6,848.56 0.000 6,848.57 0.000 6,848.58 0.000 6,848.59 0.000 6,848.60 0.000 6,848.61 0.000 6,848.62 0.000 6,848.63 0.000 6,848.64 0.000 6,848.65 0.000 6,848.66 0.000 6,848.67 0.000 6,848.68 0.000 6,848.69 0.000 6,848.70 0.000 6,848.71 0.000 6,848.72 0.000 6,848.73 0.000 6,848.74 0.000 6,848.75 0.000 6,848.76 0.000 6,848.77 0.000 6,848.78 0.000 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 51HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Pond 58R: POST-CULVERT-01B-4 [57] Hint: Peaked at 6,822.93' (Flood elevation advised) [62] Hint: Exceeded Reach 57R OUTLET depth by 0.83' @ 12.08 hrs Inflow Area = 8.507 ac, 30.05% Impervious, Inflow Depth = 0.79" for 25-YR event Inflow = 8.05 cfs @ 12.08 hrs, Volume= 0.558 af Outflow = 8.05 cfs @ 12.08 hrs, Volume= 0.558 af, Atten= 0%, Lag= 0.0 min Primary = 8.05 cfs @ 12.08 hrs, Volume= 0.558 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Peak Elev= 6,822.93' @ 12.08 hrs Device Routing Invert Outlet Devices #1 Primary 6,821.66'24.0" Round Culvert L= 42.5' Ke= 0.500 Inlet / Outlet Invert= 6,821.66' / 6,820.46' S= 0.0282 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 3.14 sf Primary OutFlow Max=8.04 cfs @ 12.08 hrs HW=6,822.93' TW=6,820.62' (Dynamic Tailwater) 1=Culvert (Inlet Controls 8.04 cfs @ 3.83 fps) Pond 58R: POST-CULVERT-01B-4 Inflow Primary Hydrograph Time (hours) 2826242220181614121086Flow (cfs)9 8 7 6 5 4 3 2 1 0 Inflow Area=8.507 ac Peak Elev=6,822.93' 24.0" Round Culvert n=0.012 L=42.5' S=0.0282 '/' 8.05 cfs8.05 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 52HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Pond 58R: POST-CULVERT-01B-4 Primary Stage-Discharge Discharge (cfs) 1514131211109876543210Elevation (feet)6,823 6,822 Culvert Pond 58R: POST-CULVERT-01B-4 Storage Stage-Area-Storage Storage (acre-feet) 0Elevation (feet)6,823 6,822 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 53HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Pond 58R: POST-CULVERT-01B-4 Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 5.00 0.00 6,821.66 0.00 5.30 0.00 6,821.66 0.00 5.60 0.00 6,821.66 0.00 5.90 0.00 6,821.66 0.00 6.20 0.00 6,821.66 0.00 6.50 0.00 6,821.66 0.00 6.80 0.00 6,821.66 0.00 7.10 0.00 6,821.66 0.00 7.40 0.00 6,821.66 0.00 7.70 0.00 6,821.66 0.00 8.00 0.00 6,821.66 0.00 8.30 0.00 6,821.66 0.00 8.60 0.00 6,821.66 0.00 8.90 0.00 6,821.66 0.00 9.20 0.00 6,821.67 0.00 9.50 0.00 6,821.68 0.00 9.80 0.01 6,821.69 0.01 10.10 0.01 6,821.70 0.01 10.40 0.03 6,821.73 0.03 10.70 0.06 6,821.76 0.06 11.00 0.10 6,821.79 0.10 11.30 0.18 6,821.83 0.18 11.60 0.33 6,821.89 0.33 11.90 2.98 6,822.39 2.98 12.20 5.37 6,822.66 5.37 12.50 1.72 6,822.20 1.72 12.80 0.97 6,822.06 0.97 13.10 0.75 6,822.01 0.75 13.40 0.63 6,821.98 0.63 13.70 0.54 6,821.96 0.54 14.00 0.48 6,821.94 0.48 14.30 0.42 6,821.92 0.42 14.60 0.40 6,821.91 0.40 14.90 0.38 6,821.91 0.38 15.20 0.35 6,821.90 0.35 15.50 0.33 6,821.89 0.33 15.80 0.31 6,821.88 0.31 16.10 0.29 6,821.87 0.29 16.40 0.27 6,821.87 0.27 16.70 0.26 6,821.87 0.26 17.00 0.25 6,821.86 0.25 17.30 0.25 6,821.86 0.25 17.60 0.24 6,821.86 0.24 17.90 0.23 6,821.85 0.23 18.20 0.22 6,821.85 0.22 18.50 0.21 6,821.84 0.21 18.80 0.20 6,821.84 0.20 19.10 0.20 6,821.84 0.20 19.40 0.19 6,821.83 0.19 19.70 0.18 6,821.83 0.18 20.00 0.17 6,821.82 0.17 20.30 0.16 6,821.82 0.16 20.60 0.16 6,821.82 0.16 Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 20.90 0.16 6,821.82 0.16 21.20 0.16 6,821.82 0.16 21.50 0.15 6,821.82 0.15 21.80 0.15 6,821.82 0.15 22.10 0.15 6,821.82 0.15 22.40 0.15 6,821.81 0.15 22.70 0.15 6,821.81 0.15 23.00 0.15 6,821.81 0.15 23.30 0.15 6,821.81 0.15 23.60 0.14 6,821.81 0.14 23.90 0.14 6,821.81 0.14 24.20 0.08 6,821.78 0.08 24.50 0.01 6,821.70 0.01 24.80 0.00 6,821.67 0.00 25.10 0.00 6,821.66 0.00 25.40 0.00 6,821.66 0.00 25.70 0.00 6,821.66 0.00 26.00 0.00 6,821.66 0.00 26.30 0.00 6,821.66 0.00 26.60 0.00 6,821.66 0.00 26.90 0.00 6,821.66 0.00 27.20 0.00 6,821.66 0.00 27.50 0.00 6,821.66 0.00 27.80 0.00 6,821.66 0.00 28.10 0.00 6,821.66 0.00 28.40 0.00 6,821.66 0.00 28.70 0.00 6,821.66 0.00 29.00 0.00 6,821.66 0.00 29.30 0.00 6,821.66 0.00 29.60 0.00 6,821.66 0.00 29.90 0.00 6,821.66 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 54HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Pond 58R: POST-CULVERT-01B-4 Elevation (feet) Primary (cfs) 6,821.66 0.00 6,821.67 0.00 6,821.68 0.00 6,821.69 0.01 6,821.70 0.01 6,821.71 0.02 6,821.72 0.02 6,821.73 0.03 6,821.74 0.04 6,821.75 0.05 6,821.76 0.06 6,821.77 0.08 6,821.78 0.09 6,821.79 0.11 6,821.80 0.12 6,821.81 0.14 6,821.82 0.16 6,821.83 0.18 6,821.84 0.20 6,821.85 0.23 6,821.86 0.25 6,821.87 0.27 6,821.88 0.30 6,821.89 0.33 6,821.90 0.36 6,821.91 0.39 6,821.92 0.42 6,821.93 0.45 6,821.94 0.48 6,821.95 0.52 6,821.96 0.55 6,821.97 0.59 6,821.98 0.62 6,821.99 0.66 6,822.00 0.70 6,822.01 0.74 6,822.02 0.79 6,822.03 0.83 6,822.04 0.87 6,822.05 0.92 6,822.06 0.96 6,822.07 1.01 6,822.08 1.06 6,822.09 1.11 6,822.10 1.16 6,822.11 1.21 6,822.12 1.26 6,822.13 1.31 6,822.14 1.37 6,822.15 1.42 6,822.16 1.48 6,822.17 1.54 6,822.18 1.59 Elevation (feet) Primary (cfs) 6,822.19 1.65 6,822.20 1.71 6,822.21 1.77 6,822.22 1.83 6,822.23 1.90 6,822.24 1.96 6,822.25 2.03 6,822.26 2.09 6,822.27 2.16 6,822.28 2.22 6,822.29 2.29 6,822.30 2.36 6,822.31 2.43 6,822.32 2.50 6,822.33 2.57 6,822.34 2.64 6,822.35 2.72 6,822.36 2.79 6,822.37 2.87 6,822.38 2.94 6,822.39 3.02 6,822.40 3.09 6,822.41 3.17 6,822.42 3.25 6,822.43 3.33 6,822.44 3.41 6,822.45 3.49 6,822.46 3.57 6,822.47 3.66 6,822.48 3.74 6,822.49 3.82 6,822.50 3.91 6,822.51 3.99 6,822.52 4.08 6,822.53 4.17 6,822.54 4.25 6,822.55 4.34 6,822.56 4.43 6,822.57 4.52 6,822.58 4.61 6,822.59 4.70 6,822.60 4.79 6,822.61 4.88 6,822.62 4.97 6,822.63 5.07 6,822.64 5.16 6,822.65 5.25 6,822.66 5.35 6,822.67 5.44 6,822.68 5.54 6,822.69 5.64 6,822.70 5.73 6,822.71 5.83 Elevation (feet) Primary (cfs) 6,822.72 5.93 6,822.73 6.02 6,822.74 6.12 6,822.75 6.22 6,822.76 6.32 6,822.77 6.42 6,822.78 6.52 6,822.79 6.62 6,822.80 6.72 6,822.81 6.83 6,822.82 6.93 6,822.83 7.03 6,822.84 7.13 6,822.85 7.24 6,822.86 7.34 6,822.87 7.44 6,822.88 7.55 6,822.89 7.65 6,822.90 7.76 6,822.91 7.86 6,822.92 7.97 6,822.93 8.07 6,822.94 8.18 6,822.95 8.29 6,822.96 8.39 6,822.97 8.50 6,822.98 8.60 6,822.99 8.71 6,823.00 8.82 6,823.01 8.93 6,823.02 9.03 6,823.03 9.14 6,823.04 9.25 6,823.05 9.36 6,823.06 9.46 6,823.07 9.57 6,823.08 9.68 6,823.09 9.79 6,823.10 9.89 6,823.11 10.00 6,823.12 10.11 6,823.13 10.22 6,823.14 10.32 6,823.15 10.43 6,823.16 10.54 6,823.17 10.65 6,823.18 10.75 6,823.19 10.86 6,823.20 10.97 6,823.21 11.07 6,823.22 11.18 6,823.23 11.29 6,823.24 11.39 Elevation (feet) Primary (cfs) 6,823.25 11.50 6,823.26 11.60 6,823.27 11.71 6,823.28 11.81 6,823.29 11.92 6,823.30 12.02 6,823.31 12.12 6,823.32 12.23 6,823.33 12.33 6,823.34 12.43 6,823.35 12.53 6,823.36 12.63 6,823.37 12.73 6,823.38 12.83 6,823.39 12.93 6,823.40 13.03 6,823.41 13.13 6,823.42 13.23 6,823.43 13.32 6,823.44 13.42 6,823.45 13.51 6,823.46 13.60 6,823.47 13.70 6,823.48 13.79 6,823.49 13.88 6,823.50 13.97 6,823.51 14.05 6,823.52 14.14 6,823.53 14.22 6,823.54 14.31 6,823.55 14.39 6,823.56 14.47 6,823.57 14.55 6,823.58 14.62 6,823.59 14.70 6,823.60 14.77 6,823.61 14.84 6,823.62 14.90 6,823.63 14.97 6,823.64 15.03 6,823.65 15.08 6,823.66 15.13 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 55HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 58R: POST-CULVERT-01B-4 Elevation (feet) Storage (acre-feet) 6,821.66 0.000 6,821.68 0.000 6,821.70 0.000 6,821.72 0.000 6,821.74 0.000 6,821.76 0.000 6,821.78 0.000 6,821.80 0.000 6,821.82 0.000 6,821.84 0.000 6,821.86 0.000 6,821.88 0.000 6,821.90 0.000 6,821.92 0.000 6,821.94 0.000 6,821.96 0.000 6,821.98 0.000 6,822.00 0.000 6,822.02 0.000 6,822.04 0.000 6,822.06 0.000 6,822.08 0.000 6,822.10 0.000 6,822.12 0.000 6,822.14 0.000 6,822.16 0.000 6,822.18 0.000 6,822.20 0.000 6,822.22 0.000 6,822.24 0.000 6,822.26 0.000 6,822.28 0.000 6,822.30 0.000 6,822.32 0.000 6,822.34 0.000 6,822.36 0.000 6,822.38 0.000 6,822.40 0.000 6,822.42 0.000 6,822.44 0.000 6,822.46 0.000 6,822.48 0.000 6,822.50 0.000 6,822.52 0.000 6,822.54 0.000 6,822.56 0.000 6,822.58 0.000 6,822.60 0.000 6,822.62 0.000 6,822.64 0.000 6,822.66 0.000 6,822.68 0.000 6,822.70 0.000 Elevation (feet) Storage (acre-feet) 6,822.72 0.000 6,822.74 0.000 6,822.76 0.000 6,822.78 0.000 6,822.80 0.000 6,822.82 0.000 6,822.84 0.000 6,822.86 0.000 6,822.88 0.000 6,822.90 0.000 6,822.92 0.000 6,822.94 0.000 6,822.96 0.000 6,822.98 0.000 6,823.00 0.000 6,823.02 0.000 6,823.04 0.000 6,823.06 0.000 6,823.08 0.000 6,823.10 0.000 6,823.12 0.000 6,823.14 0.000 6,823.16 0.000 6,823.18 0.000 6,823.20 0.000 6,823.22 0.000 6,823.24 0.000 6,823.26 0.000 6,823.28 0.000 6,823.30 0.000 6,823.32 0.000 6,823.34 0.000 6,823.36 0.000 6,823.38 0.000 6,823.40 0.000 6,823.42 0.000 6,823.44 0.000 6,823.46 0.000 6,823.48 0.000 6,823.50 0.000 6,823.52 0.000 6,823.54 0.000 6,823.56 0.000 6,823.58 0.000 6,823.60 0.000 6,823.62 0.000 6,823.64 0.000 6,823.66 0.000 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 56HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Pond 59P: Detention Basin Inflow Area = 9.433 ac, 27.85% Impervious, Inflow Depth = 0.74" for 25-YR event Inflow = 8.09 cfs @ 12.08 hrs, Volume= 0.582 af Outflow = 1.78 cfs @ 12.52 hrs, Volume= 0.566 af, Atten= 78%, Lag= 26.6 min Primary = 1.78 cfs @ 12.52 hrs, Volume= 0.566 af Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Peak Elev= 6,805.68' @ 12.52 hrs Surf.Area= 3,766 sf Storage= 8,743 cf Plug-Flow detention time= 73.4 min calculated for 0.566 af (97% of inflow) Center-of-Mass det. time= 57.8 min ( 918.7 - 860.9 ) Volume Invert Avail.Storage Storage Description #1 6,802.25' 30,863 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 6,802.25 2 0 0 6,802.50 939 118 118 6,802.75 1,956 362 480 6,803.00 2,090 506 985 6,803.25 2,228 540 1,525 6,803.50 2,370 575 2,100 6,803.75 2,515 611 2,710 6,804.00 2,664 647 3,358 6,804.25 2,817 685 4,043 6,804.50 2,973 724 4,767 6,804.75 3,134 763 5,530 6,805.00 3,298 804 6,334 6,805.25 3,466 846 7,180 6,805.50 3,638 888 8,068 6,805.75 3,814 932 8,999 6,806.00 3,993 976 9,975 6,806.25 4,193 1,023 10,998 6,806.50 4,434 1,078 12,077 6,806.75 4,717 1,144 13,220 6,807.00 5,111 1,229 14,449 6,807.25 5,870 1,373 15,822 6,807.50 6,508 1,547 17,369 6,807.75 7,087 1,699 19,068 6,808.00 8,022 1,889 20,957 6,808.25 9,070 2,137 23,093 6,808.50 10,045 2,389 25,483 6,808.75 10,818 2,608 28,091 6,809.00 11,362 2,773 30,863 Device Routing Invert Outlet Devices #1 Primary 6,802.83'6.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Secondary 6,807.46'12.0" Round Culvert L= 14.6' CPP, projecting, no headwall, Ke= 0.900 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 57HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Inlet / Outlet Invert= 6,807.46' / 6,807.09' S= 0.0253 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 0.79 sf Primary OutFlow Max=1.78 cfs @ 12.52 hrs HW=6,805.68' (Free Discharge) 1=Orifice/Grate (Orifice Controls 1.78 cfs @ 7.74 fps) Secondary OutFlow Max=0.00 cfs @ 5.00 hrs HW=6,802.25' (Free Discharge) 2=Culvert ( Controls 0.00 cfs) Pond 59P: Detention Basin Inflow Outflow Primary Secondary Hydrograph Time (hours) 2826242220181614121086Flow (cfs)9 8 7 6 5 4 3 2 1 0 Inflow Area=9.433 ac Peak Elev=6,805.68' Storage=8,743 cf 8.09 cfs 1.78 cfs1.78 cfs 0.00 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 58HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Pond 59P: Detention Basin Total Primary Secondary Stage-Discharge Discharge (cfs) 543210Elevation (feet)6,809 6,808 6,807 6,806 6,805 6,804 6,803 Orifice/Grate Culvert Pond 59P: Detention Basin Surface Storage Stage-Area-Storage Storage (cubic-feet) 30,00028,00026,00024,00022,00020,00018,00016,00014,00012,00010,0008,0006,0004,0002,0000 Surface/Horizontal/Wetted Area (sq-ft) 11,00010,0009,0008,0007,0006,0005,0004,0003,0002,0001,0000 Elevation (feet)6,809 6,808 6,807 6,806 6,805 6,804 6,803 Custom Stage Data Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 59HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Pond 59P: Detention Basin Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) Primary (cfs) Secondary (cfs) 5.00 0.00 0 6,802.25 0.00 0.00 0.00 5.60 0.00 0 6,802.25 0.00 0.00 0.00 6.20 0.00 0 6,802.25 0.00 0.00 0.00 6.80 0.00 0 6,802.25 0.00 0.00 0.00 7.40 0.00 0 6,802.25 0.00 0.00 0.00 8.00 0.00 0 6,802.25 0.00 0.00 0.00 8.60 0.00 0 6,802.25 0.00 0.00 0.00 9.20 0.00 0 6,802.27 0.00 0.00 0.00 9.80 0.01 6 6,802.31 0.00 0.00 0.00 10.40 0.03 36 6,802.39 0.00 0.00 0.00 11.00 0.10 164 6,802.54 0.00 0.00 0.00 11.60 0.33 568 6,802.79 0.00 0.00 0.00 12.20 5.53 7,210 6,805.26 1.63 1.63 0.00 12.80 1.07 8,336 6,805.57 1.74 1.74 0.00 13.40 0.68 6,559 6,805.07 1.56 1.56 0.00 14.00 0.51 4,725 6,804.49 1.31 1.31 0.00 14.60 0.42 3,198 6,803.94 1.02 1.02 0.00 15.20 0.38 2,180 6,803.53 0.73 0.73 0.00 15.80 0.33 1,631 6,803.30 0.49 0.49 0.00 16.40 0.29 1,411 6,803.20 0.35 0.35 0.00 17.00 0.27 1,333 6,803.16 0.29 0.29 0.00 17.60 0.25 1,296 6,803.15 0.27 0.27 0.00 18.20 0.23 1,267 6,803.13 0.25 0.25 0.00 18.80 0.22 1,239 6,803.12 0.23 0.23 0.00 19.40 0.20 1,211 6,803.11 0.21 0.21 0.00 20.00 0.18 1,182 6,803.09 0.19 0.19 0.00 20.60 0.17 1,156 6,803.08 0.18 0.18 0.00 21.20 0.17 1,143 6,803.07 0.17 0.17 0.00 21.80 0.16 1,136 6,803.07 0.17 0.17 0.00 22.40 0.16 1,130 6,803.07 0.16 0.16 0.00 23.00 0.16 1,124 6,803.07 0.16 0.16 0.00 23.60 0.15 1,118 6,803.06 0.16 0.16 0.00 24.20 0.10 1,103 6,803.06 0.15 0.15 0.00 24.80 0.00 935 6,802.98 0.07 0.07 0.00 25.40 0.00 840 6,802.93 0.03 0.03 0.00 26.00 0.00 789 6,802.90 0.02 0.02 0.00 26.60 0.00 758 6,802.89 0.01 0.01 0.00 27.20 0.00 737 6,802.88 0.01 0.01 0.00 27.80 0.00 722 6,802.87 0.01 0.01 0.00 28.40 0.00 712 6,802.87 0.00 0.00 0.00 29.00 0.00 703 6,802.86 0.00 0.00 0.00 29.60 0.00 696 6,802.86 0.00 0.00 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 60HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Pond 59P: Detention Basin Elevation (feet) Discharge (cfs) Primary (cfs) Secondary (cfs) 6,802.25 0.00 0.00 0.00 6,802.35 0.00 0.00 0.00 6,802.45 0.00 0.00 0.00 6,802.55 0.00 0.00 0.00 6,802.65 0.00 0.00 0.00 6,802.75 0.00 0.00 0.00 6,802.85 0.00 0.00 0.00 6,802.95 0.04 0.04 0.00 6,803.05 0.14 0.14 0.00 6,803.15 0.27 0.27 0.00 6,803.25 0.42 0.42 0.00 6,803.35 0.56 0.56 0.00 6,803.45 0.66 0.66 0.00 6,803.55 0.74 0.74 0.00 6,803.65 0.82 0.82 0.00 6,803.75 0.89 0.89 0.00 6,803.85 0.96 0.96 0.00 6,803.95 1.02 1.02 0.00 6,804.05 1.08 1.08 0.00 6,804.15 1.14 1.14 0.00 6,804.25 1.19 1.19 0.00 6,804.35 1.24 1.24 0.00 6,804.45 1.29 1.29 0.00 6,804.55 1.34 1.34 0.00 6,804.65 1.38 1.38 0.00 6,804.75 1.42 1.42 0.00 6,804.85 1.47 1.47 0.00 6,804.95 1.51 1.51 0.00 6,805.05 1.55 1.55 0.00 6,805.15 1.59 1.59 0.00 6,805.25 1.63 1.63 0.00 6,805.35 1.66 1.66 0.00 6,805.45 1.70 1.70 0.00 6,805.55 1.74 1.74 0.00 6,805.65 1.77 1.77 0.00 6,805.75 1.81 1.81 0.00 6,805.85 1.84 1.84 0.00 6,805.95 1.87 1.87 0.00 6,806.05 1.91 1.91 0.00 6,806.15 1.94 1.94 0.00 6,806.25 1.97 1.97 0.00 6,806.35 2.00 2.00 0.00 6,806.45 2.03 2.03 0.00 6,806.55 2.06 2.06 0.00 6,806.65 2.09 2.09 0.00 6,806.75 2.12 2.12 0.00 6,806.85 2.15 2.15 0.00 6,806.95 2.18 2.18 0.00 6,807.05 2.20 2.20 0.00 6,807.15 2.23 2.23 0.00 6,807.25 2.26 2.26 0.00 6,807.35 2.29 2.29 0.00 6,807.45 2.31 2.31 0.00 Elevation (feet) Discharge (cfs) Primary (cfs) Secondary (cfs) 6,807.55 2.37 2.34 0.03 6,807.65 2.49 2.37 0.12 6,807.75 2.67 2.39 0.27 6,807.85 2.89 2.42 0.48 6,807.95 3.16 2.44 0.72 6,808.05 3.46 2.47 1.00 6,808.15 3.78 2.49 1.29 6,808.25 4.11 2.52 1.59 6,808.35 4.41 2.54 1.87 6,808.45 4.66 2.57 2.10 6,808.55 4.88 2.59 2.29 6,808.65 5.09 2.61 2.48 6,808.75 5.29 2.64 2.65 6,808.85 5.48 2.66 2.82 6,808.95 5.65 2.68 2.97 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 61HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 59P: Detention Basin Elevation (feet) Surface (sq-ft) Storage (cubic-feet) 6,802.25 2 0 6,802.35 377 19 6,802.45 752 75 6,802.55 1,142 170 6,802.65 1,549 304 6,802.75 1,956 480 6,802.85 2,010 678 6,802.95 2,063 881 6,803.05 2,118 1,090 6,803.15 2,173 1,305 6,803.25 2,228 1,525 6,803.35 2,285 1,751 6,803.45 2,342 1,982 6,803.55 2,399 2,219 6,803.65 2,457 2,462 6,803.75 2,515 2,710 6,803.85 2,575 2,965 6,803.95 2,634 3,225 6,804.05 2,695 3,492 6,804.15 2,756 3,764 6,804.25 2,817 4,043 6,804.35 2,879 4,328 6,804.45 2,942 4,619 6,804.55 3,005 4,916 6,804.65 3,070 5,220 6,804.75 3,134 5,530 6,804.85 3,200 5,847 6,804.95 3,265 6,170 6,805.05 3,332 6,500 6,805.15 3,399 6,836 6,805.25 3,466 7,180 6,805.35 3,535 7,530 6,805.45 3,604 7,886 6,805.55 3,673 8,250 6,805.65 3,744 8,621 6,805.75 3,814 8,999 6,805.85 3,886 9,384 6,805.95 3,957 9,776 6,806.05 4,033 10,176 6,806.15 4,113 10,583 6,806.25 4,193 10,998 6,806.35 4,289 11,422 6,806.45 4,386 11,856 6,806.55 4,491 12,300 6,806.65 4,604 12,754 6,806.75 4,717 13,220 6,806.85 4,875 13,700 6,806.95 5,032 14,195 6,807.05 5,263 14,708 6,807.15 5,566 15,250 6,807.25 5,870 15,822 6,807.35 6,125 16,421 6,807.45 6,380 17,047 Elevation (feet) Surface (sq-ft) Storage (cubic-feet) 6,807.55 6,624 17,697 6,807.65 6,855 18,371 6,807.75 7,087 19,068 6,807.85 7,461 19,796 6,807.95 7,835 20,560 6,808.05 8,232 21,363 6,808.15 8,651 22,207 6,808.25 9,070 23,093 6,808.35 9,460 24,020 6,808.45 9,850 24,985 6,808.55 10,200 25,989 6,808.65 10,509 27,024 6,808.75 10,818 28,091 6,808.85 11,036 29,183 6,808.95 11,253 30,298 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 62HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Time span=5.00-30.00 hrs, dt=0.03 hrs, 834 points x 3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2.123 ac 24.18% Impervious Runoff Depth=1.20"Subcatchment 51S: POST-AREA-01A Flow Length=565' Tc=20.0 min CN=80 Runoff=2.77 cfs 0.213 af Runoff Area=3.410 ac 27.24% Impervious Runoff Depth=1.15"Subcatchment 53S: POST-AREA-01B Flow Length=523' Tc=13.5 min CN=79 Runoff=5.21 cfs 0.326 af Runoff Area=1.036 ac 39.02% Impervious Runoff Depth=1.38"Subcatchment 54S: POST-AREA-01C Flow Length=512' Tc=13.6 min CN=83 Runoff=1.91 cfs 0.119 af Runoff Area=1.938 ac 36.64% Impervious Runoff Depth=1.26"Subcatchment 56S: PRE-AREA-01D Flow Length=440' Tc=14.4 min CN=81 Runoff=3.16 cfs 0.203 af Runoff Area=0.926 ac 7.67% Impervious Runoff Depth=0.58"Subcatchment 62S: POST-AREA-01E Flow Length=251' Tc=39.9 min CN=66 Runoff=0.32 cfs 0.045 af Avg. Flow Depth=0.40' Max Vel=13.75 fps Inflow=5.21 cfs 0.326 afReach 56R: POST-CULVERT-01B-2 18.0" Round Pipe n=0.012 L=139.1' S=0.0864 '/' Capacity=33.45 cfs Outflow=5.21 cfs 0.326 af Avg. Flow Depth=0.43' Max Vel=17.01 fps Inflow=7.12 cfs 0.445 afReach 57R: POST-CULVERT-01B-3 18.0" Round Pipe n=0.012 L=102.2' S=0.1224 '/' Capacity=39.81 cfs Outflow=7.12 cfs 0.445 af Avg. Flow Depth=0.50' Max Vel=4.06 fps Inflow=2.77 cfs 0.213 afReach 59R: POST-REACH-01B n=0.030 L=280.8' S=0.0467 '/' Capacity=17.78 cfs Outflow=2.76 cfs 0.213 af Avg. Flow Depth=0.20' Max Vel=5.38 fps Inflow=12.63 cfs 0.860 afReach 61R: POST-REACH-01B-4 n=0.030 L=56.7' S=0.2021 '/' Capacity=112.36 cfs Outflow=12.63 cfs 0.860 af Peak Elev=6,840.05' Inflow=2.77 cfs 0.213 afPond 52P: POST-CULVERT-01A 12.0" Round Culvert n=0.012 L=57.2' S=0.0257 '/' Outflow=2.77 cfs 0.213 af Peak Elev=6,848.42' Inflow=5.21 cfs 0.326 afPond 55P: POST-CULVERT-01B-1 18.0" Round Culvert n=0.012 L=39.7' S=0.0199 '/' Outflow=5.21 cfs 0.326 af Peak Elev=6,823.36' Inflow=12.63 cfs 0.860 afPond 58R: POST-CULVERT-01B-4 24.0" Round Culvert n=0.012 L=42.5' S=0.0282 '/' Outflow=12.63 cfs 0.860 af Peak Elev=6,807.13' Storage=15,138 cf Inflow=12.73 cfs 0.905 afPond 59P: Detention Basin Primary=2.23 cfs 0.889 af Secondary=0.00 cfs 0.000 af Outflow=2.23 cfs 0.889 af Total Runoff Area = 9.433 ac Runoff Volume = 0.905 af Average Runoff Depth = 1.15" 72.15% Pervious = 6.805 ac 27.85% Impervious = 2.628 ac Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 63HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 51S: POST-AREA-01A Runoff = 2.77 cfs @ 12.13 hrs, Volume= 0.213 af, Depth= 1.20" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.15 Area (ac) CN Description 0.091 71 Meadow, non-grazed, HSG C 0.749 83 1/4 acre lots, 38% imp, HSG C 1.198 77 2 acre lots, 12% imp, HSG C 0.085 98 Paved parking, HSG C 2.123 80 Weighted Average 1.610 75.82% Pervious Area 0.513 24.18% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.4 201 0.1289 0.18 Sheet Flow, Grass Meadows Grass: Dense n= 0.240 P2= 1.33" 1.1 151 0.1143 2.37 Shallow Concentrated Flow, Grass Meadow Short Grass Pasture Kv= 7.0 fps 0.5 213 0.0597 7.36 22.08 Trap/Vee/Rect Channel Flow, New Roadside Ditch Bot.W=0.00' D=1.00' Z= 3.0 '/' Top.W=6.00' n= 0.030 Earth, grassed & winding 20.0 565 Total Subcatchment 51S: POST-AREA-01A Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)3 2 1 0 Type II 24-hr 100-YR Rainfall=2.81" Ia/S=0.15 Runoff Area=2.123 ac Runoff Volume=0.213 af Runoff Depth=1.20" Flow Length=565' Tc=20.0 min CN=80 2.77 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 64HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 51S: POST-AREA-01A Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.18 0.00 0.00 5.30 0.19 0.00 0.00 5.60 0.21 0.00 0.00 5.90 0.22 0.00 0.00 6.20 0.24 0.00 0.00 6.50 0.25 0.00 0.00 6.80 0.27 0.00 0.00 7.10 0.28 0.00 0.00 7.40 0.30 0.00 0.00 7.70 0.32 0.00 0.00 8.00 0.34 0.00 0.00 8.30 0.36 0.00 0.00 8.60 0.38 0.00 0.00 8.90 0.40 0.00 0.00 9.20 0.43 0.00 0.00 9.50 0.46 0.00 0.01 9.80 0.49 0.00 0.01 10.10 0.52 0.01 0.02 10.40 0.56 0.01 0.03 10.70 0.60 0.02 0.04 11.00 0.66 0.03 0.06 11.30 0.73 0.04 0.09 11.60 0.86 0.08 0.15 11.90 1.60 0.40 0.88 12.20 1.96 0.62 2.50 12.50 2.07 0.68 0.81 12.80 2.13 0.73 0.40 13.10 2.19 0.76 0.29 13.40 2.23 0.79 0.24 13.70 2.27 0.82 0.20 14.00 2.30 0.84 0.18 14.30 2.33 0.86 0.16 14.60 2.36 0.88 0.14 14.90 2.39 0.90 0.14 15.20 2.41 0.92 0.13 15.50 2.44 0.93 0.12 15.80 2.46 0.95 0.11 16.10 2.48 0.96 0.10 16.40 2.50 0.97 0.10 16.70 2.52 0.99 0.09 17.00 2.53 1.00 0.09 17.30 2.55 1.01 0.09 17.60 2.57 1.02 0.08 17.90 2.58 1.04 0.08 18.20 2.60 1.05 0.08 18.50 2.61 1.06 0.08 18.80 2.63 1.07 0.07 19.10 2.64 1.08 0.07 19.40 2.65 1.09 0.07 19.70 2.66 1.09 0.06 20.00 2.68 1.10 0.06 20.30 2.69 1.11 0.06 20.60 2.70 1.12 0.06 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.71 1.13 0.06 21.20 2.72 1.13 0.06 21.50 2.73 1.14 0.05 21.80 2.74 1.15 0.05 22.10 2.75 1.16 0.05 22.40 2.76 1.16 0.05 22.70 2.77 1.17 0.05 23.00 2.78 1.18 0.05 23.30 2.79 1.19 0.05 23.60 2.80 1.19 0.05 23.90 2.81 1.20 0.05 24.20 2.81 1.20 0.04 24.50 2.81 1.20 0.00 24.80 2.81 1.20 0.00 25.10 2.81 1.20 0.00 25.40 2.81 1.20 0.00 25.70 2.81 1.20 0.00 26.00 2.81 1.20 0.00 26.30 2.81 1.20 0.00 26.60 2.81 1.20 0.00 26.90 2.81 1.20 0.00 27.20 2.81 1.20 0.00 27.50 2.81 1.20 0.00 27.80 2.81 1.20 0.00 28.10 2.81 1.20 0.00 28.40 2.81 1.20 0.00 28.70 2.81 1.20 0.00 29.00 2.81 1.20 0.00 29.30 2.81 1.20 0.00 29.60 2.81 1.20 0.00 29.90 2.81 1.20 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 65HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 53S: POST-AREA-01B Runoff = 5.21 cfs @ 12.06 hrs, Volume= 0.326 af, Depth= 1.15" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.15 Area (ac) CN Description 1.532 71 Meadow, non-grazed, HSG C 1.531 83 1/4 acre lots, 38% imp, HSG C 0.347 98 Paved parking, HSG C 3.410 79 Weighted Average 2.481 72.76% Pervious Area 0.929 27.24% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.8 75 0.0902 1.53 Sheet Flow, Driveway Pavement Smooth surfaces n= 0.011 P2= 1.33" 11.7 126 0.1558 0.18 Sheet Flow, Grass Meadows Grass: Dense n= 0.240 P2= 1.33" 0.4 68 0.1295 2.52 Shallow Concentrated Flow, Grass Meadow Short Grass Pasture Kv= 7.0 fps 0.6 254 0.0508 6.79 20.37 Trap/Vee/Rect Channel Flow, New Roadside Ditch Bot.W=0.00' D=1.00' Z= 3.0 '/' Top.W=6.00' n= 0.030 Earth, grassed & winding 13.5 523 Total Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 66HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcatchment 53S: POST-AREA-01B Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)5 4 3 2 1 0 Type II 24-hr 100-YR Rainfall=2.81" Ia/S=0.15 Runoff Area=3.410 ac Runoff Volume=0.326 af Runoff Depth=1.15" Flow Length=523' Tc=13.5 min CN=79 5.21 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 67HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 53S: POST-AREA-01B Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.18 0.00 0.00 5.30 0.19 0.00 0.00 5.60 0.21 0.00 0.00 5.90 0.22 0.00 0.00 6.20 0.24 0.00 0.00 6.50 0.25 0.00 0.00 6.80 0.27 0.00 0.00 7.10 0.28 0.00 0.00 7.40 0.30 0.00 0.00 7.70 0.32 0.00 0.00 8.00 0.34 0.00 0.00 8.30 0.36 0.00 0.00 8.60 0.38 0.00 0.00 8.90 0.40 0.00 0.00 9.20 0.43 0.00 0.00 9.50 0.46 0.00 0.01 9.80 0.49 0.00 0.02 10.10 0.52 0.01 0.03 10.40 0.56 0.01 0.04 10.70 0.60 0.01 0.06 11.00 0.66 0.02 0.09 11.30 0.73 0.04 0.14 11.60 0.86 0.07 0.25 11.90 1.60 0.37 2.22 12.20 1.96 0.58 2.74 12.50 2.07 0.64 0.85 12.80 2.13 0.68 0.51 13.10 2.19 0.72 0.41 13.40 2.23 0.75 0.35 13.70 2.27 0.77 0.30 14.00 2.30 0.80 0.26 14.30 2.33 0.82 0.23 14.60 2.36 0.83 0.22 14.90 2.39 0.85 0.21 15.20 2.41 0.87 0.20 15.50 2.44 0.89 0.18 15.80 2.46 0.90 0.17 16.10 2.48 0.91 0.16 16.40 2.50 0.93 0.15 16.70 2.52 0.94 0.14 17.00 2.53 0.95 0.14 17.30 2.55 0.96 0.14 17.60 2.57 0.97 0.13 17.90 2.58 0.99 0.13 18.20 2.60 1.00 0.12 18.50 2.61 1.01 0.12 18.80 2.63 1.02 0.11 19.10 2.64 1.02 0.11 19.40 2.65 1.03 0.10 19.70 2.66 1.04 0.10 20.00 2.68 1.05 0.09 20.30 2.69 1.06 0.09 20.60 2.70 1.07 0.09 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.71 1.07 0.09 21.20 2.72 1.08 0.09 21.50 2.73 1.09 0.09 21.80 2.74 1.10 0.08 22.10 2.75 1.10 0.08 22.40 2.76 1.11 0.08 22.70 2.77 1.12 0.08 23.00 2.78 1.12 0.08 23.30 2.79 1.13 0.08 23.60 2.80 1.14 0.08 23.90 2.81 1.14 0.08 24.20 2.81 1.15 0.04 24.50 2.81 1.15 0.00 24.80 2.81 1.15 0.00 25.10 2.81 1.15 0.00 25.40 2.81 1.15 0.00 25.70 2.81 1.15 0.00 26.00 2.81 1.15 0.00 26.30 2.81 1.15 0.00 26.60 2.81 1.15 0.00 26.90 2.81 1.15 0.00 27.20 2.81 1.15 0.00 27.50 2.81 1.15 0.00 27.80 2.81 1.15 0.00 28.10 2.81 1.15 0.00 28.40 2.81 1.15 0.00 28.70 2.81 1.15 0.00 29.00 2.81 1.15 0.00 29.30 2.81 1.15 0.00 29.60 2.81 1.15 0.00 29.90 2.81 1.15 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 68HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 54S: POST-AREA-01C Runoff = 1.91 cfs @ 12.06 hrs, Volume= 0.119 af, Depth= 1.38" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.15 Area (ac) CN Description 0.777 83 1/4 acre lots, 38% imp, HSG C 0.150 71 Meadow, non-grazed, HSG C 0.109 98 Paved parking, HSG C 1.036 83 Weighted Average 0.632 60.98% Pervious Area 0.404 39.02% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.6 53 0.0813 1.37 Sheet Flow, Silver King Pavement Smooth surfaces n= 0.011 P2= 1.33" 12.2 155 0.0828 0.21 Sheet Flow, Developed Yards Grass: Short n= 0.150 P2= 1.33" 0.3 81 0.0948 4.62 Shallow Concentrated Flow, Developed Yards Grassed Waterway Kv= 15.0 fps 0.5 223 0.0500 8.03 22.09 Trap/Vee/Rect Channel Flow, New Stormwater Channel Bot.W=0.00' D=1.00' Z= 2.5 & 3.0 '/' Top.W=5.50' n= 0.025 Earth, clean & winding 13.6 512 Total Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 69HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcatchment 54S: POST-AREA-01C Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)2 1 0 Type II 24-hr 100-YR Rainfall=2.81" Ia/S=0.15 Runoff Area=1.036 ac Runoff Volume=0.119 af Runoff Depth=1.38" Flow Length=512' Tc=13.6 min CN=83 1.91 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 70HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 54S: POST-AREA-01C Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.18 0.00 0.00 5.30 0.19 0.00 0.00 5.60 0.21 0.00 0.00 5.90 0.22 0.00 0.00 6.20 0.24 0.00 0.00 6.50 0.25 0.00 0.00 6.80 0.27 0.00 0.00 7.10 0.28 0.00 0.00 7.40 0.30 0.00 0.00 7.70 0.32 0.00 0.00 8.00 0.34 0.00 0.00 8.30 0.36 0.00 0.00 8.60 0.38 0.00 0.00 8.90 0.40 0.00 0.01 9.20 0.43 0.01 0.01 9.50 0.46 0.01 0.01 9.80 0.49 0.01 0.01 10.10 0.52 0.02 0.02 10.40 0.56 0.03 0.02 10.70 0.60 0.04 0.03 11.00 0.66 0.05 0.05 11.30 0.73 0.07 0.07 11.60 0.86 0.12 0.11 11.90 1.60 0.50 0.86 12.20 1.96 0.74 0.99 12.50 2.07 0.81 0.30 12.80 2.13 0.86 0.18 13.10 2.19 0.90 0.14 13.40 2.23 0.93 0.12 13.70 2.27 0.96 0.10 14.00 2.30 0.99 0.09 14.30 2.33 1.01 0.08 14.60 2.36 1.03 0.08 14.90 2.39 1.05 0.07 15.20 2.41 1.07 0.07 15.50 2.44 1.09 0.06 15.80 2.46 1.10 0.06 16.10 2.48 1.12 0.05 16.40 2.50 1.13 0.05 16.70 2.52 1.15 0.05 17.00 2.53 1.16 0.05 17.30 2.55 1.17 0.05 17.60 2.57 1.19 0.04 17.90 2.58 1.20 0.04 18.20 2.60 1.21 0.04 18.50 2.61 1.22 0.04 18.80 2.63 1.23 0.04 19.10 2.64 1.24 0.04 19.40 2.65 1.25 0.03 19.70 2.66 1.26 0.03 20.00 2.68 1.27 0.03 20.30 2.69 1.28 0.03 20.60 2.70 1.29 0.03 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.71 1.30 0.03 21.20 2.72 1.30 0.03 21.50 2.73 1.31 0.03 21.80 2.74 1.32 0.03 22.10 2.75 1.33 0.03 22.40 2.76 1.34 0.03 22.70 2.77 1.34 0.03 23.00 2.78 1.35 0.03 23.30 2.79 1.36 0.03 23.60 2.80 1.37 0.03 23.90 2.81 1.37 0.03 24.20 2.81 1.38 0.01 24.50 2.81 1.38 0.00 24.80 2.81 1.38 0.00 25.10 2.81 1.38 0.00 25.40 2.81 1.38 0.00 25.70 2.81 1.38 0.00 26.00 2.81 1.38 0.00 26.30 2.81 1.38 0.00 26.60 2.81 1.38 0.00 26.90 2.81 1.38 0.00 27.20 2.81 1.38 0.00 27.50 2.81 1.38 0.00 27.80 2.81 1.38 0.00 28.10 2.81 1.38 0.00 28.40 2.81 1.38 0.00 28.70 2.81 1.38 0.00 29.00 2.81 1.38 0.00 29.30 2.81 1.38 0.00 29.60 2.81 1.38 0.00 29.90 2.81 1.38 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 71HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 56S: PRE-AREA-01D Runoff = 3.16 cfs @ 12.07 hrs, Volume= 0.203 af, Depth= 1.26" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.15 Area (ac) CN Description 1.203 83 1/4 acre lots, 38% imp, HSG C 0.302 71 Meadow, non-grazed, HSG C 0.180 57 Oak/aspen range, Fair, HSG C 0.253 98 Paved parking, HSG C 1.938 81 Weighted Average 1.228 63.36% Pervious Area 0.710 36.64% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.7 201 0.1042 0.24 Sheet Flow, Yards - Residential Landscaping Grass: Short n= 0.150 P2= 1.33" 0.1 24 0.2353 3.40 Shallow Concentrated Flow, Cut Slope to Roadside Ditch Short Grass Pasture Kv= 7.0 fps 0.6 215 0.0376 5.80 15.96 Trap/Vee/Rect Channel Flow, Roadside Ditch Bot.W=0.00' D=1.00' Z= 3.0 & 2.5 '/' Top.W=5.50' n= 0.030 Earth, grassed & winding 14.4 440 Total Subcatchment 56S: PRE-AREA-01D Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)3 2 1 0 Type II 24-hr 100-YR Rainfall=2.81" Ia/S=0.15 Runoff Area=1.938 ac Runoff Volume=0.203 af Runoff Depth=1.26" Flow Length=440' Tc=14.4 min CN=81 3.16 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 72HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 56S: PRE-AREA-01D Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.18 0.00 0.00 5.30 0.19 0.00 0.00 5.60 0.21 0.00 0.00 5.90 0.22 0.00 0.00 6.20 0.24 0.00 0.00 6.50 0.25 0.00 0.00 6.80 0.27 0.00 0.00 7.10 0.28 0.00 0.00 7.40 0.30 0.00 0.00 7.70 0.32 0.00 0.00 8.00 0.34 0.00 0.00 8.30 0.36 0.00 0.00 8.60 0.38 0.00 0.00 8.90 0.40 0.00 0.00 9.20 0.43 0.00 0.01 9.50 0.46 0.00 0.01 9.80 0.49 0.01 0.02 10.10 0.52 0.01 0.02 10.40 0.56 0.02 0.03 10.70 0.60 0.02 0.05 11.00 0.66 0.04 0.07 11.30 0.73 0.05 0.10 11.60 0.86 0.09 0.17 11.90 1.60 0.43 1.34 12.20 1.96 0.66 1.85 12.50 2.07 0.72 0.55 12.80 2.13 0.77 0.32 13.10 2.19 0.80 0.25 13.40 2.23 0.84 0.21 13.70 2.27 0.86 0.18 14.00 2.30 0.89 0.16 14.30 2.33 0.91 0.14 14.60 2.36 0.93 0.13 14.90 2.39 0.95 0.13 15.20 2.41 0.97 0.12 15.50 2.44 0.98 0.11 15.80 2.46 1.00 0.10 16.10 2.48 1.01 0.09 16.40 2.50 1.03 0.09 16.70 2.52 1.04 0.09 17.00 2.53 1.05 0.08 17.30 2.55 1.06 0.08 17.60 2.57 1.08 0.08 17.90 2.58 1.09 0.08 18.20 2.60 1.10 0.07 18.50 2.61 1.11 0.07 18.80 2.63 1.12 0.07 19.10 2.64 1.13 0.06 19.40 2.65 1.14 0.06 19.70 2.66 1.15 0.06 20.00 2.68 1.16 0.06 20.30 2.69 1.16 0.05 20.60 2.70 1.17 0.05 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.71 1.18 0.05 21.20 2.72 1.19 0.05 21.50 2.73 1.20 0.05 21.80 2.74 1.20 0.05 22.10 2.75 1.21 0.05 22.40 2.76 1.22 0.05 22.70 2.77 1.23 0.05 23.00 2.78 1.23 0.05 23.30 2.79 1.24 0.05 23.60 2.80 1.25 0.05 23.90 2.81 1.26 0.05 24.20 2.81 1.26 0.02 24.50 2.81 1.26 0.00 24.80 2.81 1.26 0.00 25.10 2.81 1.26 0.00 25.40 2.81 1.26 0.00 25.70 2.81 1.26 0.00 26.00 2.81 1.26 0.00 26.30 2.81 1.26 0.00 26.60 2.81 1.26 0.00 26.90 2.81 1.26 0.00 27.20 2.81 1.26 0.00 27.50 2.81 1.26 0.00 27.80 2.81 1.26 0.00 28.10 2.81 1.26 0.00 28.40 2.81 1.26 0.00 28.70 2.81 1.26 0.00 29.00 2.81 1.26 0.00 29.30 2.81 1.26 0.00 29.60 2.81 1.26 0.00 29.90 2.81 1.26 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 73HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 62S: POST-AREA-01E Runoff = 0.32 cfs @ 12.42 hrs, Volume= 0.045 af, Depth= 0.58" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.15 Area (ac) CN Description 0.363 71 Meadow, non-grazed, HSG C 0.492 57 Oak/aspen range, Fair, HSG C 0.071 98 Paved parking, HSG C 0.926 66 Weighted Average 0.855 92.33% Pervious Area 0.071 7.67% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.6 41 0.0647 1.19 Sheet Flow, New Road Pavement Smooth surfaces n= 0.011 P2= 1.33" 1.0 9 0.3380 0.14 Sheet Flow, New Road Fill Slope Grass: Dense n= 0.240 P2= 1.33" 37.3 150 0.1358 0.07 Sheet Flow, Oak Brush Woods: Dense underbrush n= 0.800 P2= 1.33" 1.0 51 0.0297 0.86 Shallow Concentrated Flow, Meadow Woodland Kv= 5.0 fps 39.9 251 Total Subcatchment 62S: POST-AREA-01E Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr 100-YR Rainfall=2.81" Ia/S=0.15 Runoff Area=0.926 ac Runoff Volume=0.045 af Runoff Depth=0.58" Flow Length=251' Tc=39.9 min CN=66 0.32 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 74HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 62S: POST-AREA-01E Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.18 0.00 0.00 5.30 0.19 0.00 0.00 5.60 0.21 0.00 0.00 5.90 0.22 0.00 0.00 6.20 0.24 0.00 0.00 6.50 0.25 0.00 0.00 6.80 0.27 0.00 0.00 7.10 0.28 0.00 0.00 7.40 0.30 0.00 0.00 7.70 0.32 0.00 0.00 8.00 0.34 0.00 0.00 8.30 0.36 0.00 0.00 8.60 0.38 0.00 0.00 8.90 0.40 0.00 0.00 9.20 0.43 0.00 0.00 9.50 0.46 0.00 0.00 9.80 0.49 0.00 0.00 10.10 0.52 0.00 0.00 10.40 0.56 0.00 0.00 10.70 0.60 0.00 0.00 11.00 0.66 0.00 0.00 11.30 0.73 0.00 0.00 11.60 0.86 0.00 0.00 11.90 1.60 0.11 0.01 12.20 1.96 0.22 0.21 12.50 2.07 0.26 0.30 12.80 2.13 0.28 0.18 13.10 2.19 0.30 0.11 13.40 2.23 0.32 0.08 13.70 2.27 0.34 0.06 14.00 2.30 0.35 0.05 14.30 2.33 0.36 0.05 14.60 2.36 0.38 0.04 14.90 2.39 0.39 0.04 15.20 2.41 0.40 0.04 15.50 2.44 0.41 0.03 15.80 2.46 0.42 0.03 16.10 2.48 0.42 0.03 16.40 2.50 0.43 0.03 16.70 2.52 0.44 0.03 17.00 2.53 0.45 0.03 17.30 2.55 0.46 0.02 17.60 2.57 0.46 0.02 17.90 2.58 0.47 0.02 18.20 2.60 0.48 0.02 18.50 2.61 0.48 0.02 18.80 2.63 0.49 0.02 19.10 2.64 0.50 0.02 19.40 2.65 0.50 0.02 19.70 2.66 0.51 0.02 20.00 2.68 0.51 0.02 20.30 2.69 0.52 0.02 20.60 2.70 0.52 0.02 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.71 0.53 0.02 21.20 2.72 0.53 0.02 21.50 2.73 0.54 0.02 21.80 2.74 0.54 0.02 22.10 2.75 0.55 0.02 22.40 2.76 0.55 0.02 22.70 2.77 0.56 0.01 23.00 2.78 0.56 0.01 23.30 2.79 0.57 0.01 23.60 2.80 0.57 0.01 23.90 2.81 0.58 0.01 24.20 2.81 0.58 0.01 24.50 2.81 0.58 0.01 24.80 2.81 0.58 0.00 25.10 2.81 0.58 0.00 25.40 2.81 0.58 0.00 25.70 2.81 0.58 0.00 26.00 2.81 0.58 0.00 26.30 2.81 0.58 0.00 26.60 2.81 0.58 0.00 26.90 2.81 0.58 0.00 27.20 2.81 0.58 0.00 27.50 2.81 0.58 0.00 27.80 2.81 0.58 0.00 28.10 2.81 0.58 0.00 28.40 2.81 0.58 0.00 28.70 2.81 0.58 0.00 29.00 2.81 0.58 0.00 29.30 2.81 0.58 0.00 29.60 2.81 0.58 0.00 29.90 2.81 0.58 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 75HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 56R: POST-CULVERT-01B-2 [52] Hint: Inlet/Outlet conditions not evaluated Inflow Area = 3.410 ac, 27.24% Impervious, Inflow Depth = 1.15" for 100-YR event Inflow = 5.21 cfs @ 12.06 hrs, Volume= 0.326 af Outflow = 5.21 cfs @ 12.06 hrs, Volume= 0.326 af, Atten= 0%, Lag= 0.1 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 13.75 fps, Min. Travel Time= 0.2 min Avg. Velocity = 4.67 fps, Avg. Travel Time= 0.5 min Peak Storage= 53 cf @ 12.06 hrs Average Depth at Peak Storage= 0.40' , Surface Width= 1.33' Bank-Full Depth= 1.50' Flow Area= 1.8 sf, Capacity= 33.45 cfs 18.0" Round Pipe n= 0.012 Corrugated PP, smooth interior Length= 139.1' Slope= 0.0864 '/' Inlet Invert= 6,846.39', Outlet Invert= 6,834.37' Reach 56R: POST-CULVERT-01B-2 Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)5 4 3 2 1 0 Inflow Area=3.410 ac Avg. Flow Depth=0.40' Max Vel=13.75 fps 18.0" Round Pipe n=0.012 L=139.1' S=0.0864 '/' Capacity=33.45 cfs 5.21 cfs5.21 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 76HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 56R: POST-CULVERT-01B-2 Primary Stage-Discharge Discharge (cfs) 35302520151050Depth (feet)1 0 Reach 56R: POST-CULVERT-01B-2 Storage Stage-Storage Storage (cubic-feet) 240220200180160140120100806040200Depth (feet)1 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 77HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 56R: POST-CULVERT-01B-2 Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,846.39 0.00 5.60 0.00 0 6,846.39 0.00 6.20 0.00 0 6,846.39 0.00 6.80 0.00 0 6,846.39 0.00 7.40 0.00 0 6,846.39 0.00 8.00 0.00 0 6,846.39 0.00 8.60 0.00 0 6,846.39 0.00 9.20 0.00 0 6,846.40 0.00 9.80 0.02 1 6,846.41 0.02 10.40 0.04 2 6,846.43 0.04 11.00 0.09 3 6,846.45 0.09 11.60 0.25 6 6,846.48 0.25 12.20 2.74 34 6,846.68 2.79 12.80 0.51 10 6,846.52 0.51 13.40 0.35 8 6,846.50 0.35 14.00 0.26 6 6,846.48 0.26 14.60 0.22 6 6,846.48 0.22 15.20 0.20 5 6,846.47 0.20 15.80 0.17 5 6,846.47 0.17 16.40 0.15 4 6,846.46 0.15 17.00 0.14 4 6,846.46 0.14 17.60 0.13 4 6,846.46 0.13 18.20 0.12 4 6,846.46 0.12 18.80 0.11 4 6,846.45 0.11 19.40 0.10 3 6,846.45 0.10 20.00 0.09 3 6,846.45 0.09 20.60 0.09 3 6,846.45 0.09 21.20 0.09 3 6,846.45 0.09 21.80 0.08 3 6,846.45 0.08 22.40 0.08 3 6,846.44 0.08 23.00 0.08 3 6,846.44 0.08 23.60 0.08 3 6,846.44 0.08 24.20 0.04 2 6,846.43 0.04 24.80 0.00 0 6,846.39 0.00 25.40 0.00 0 6,846.39 0.00 26.00 0.00 0 6,846.39 0.00 26.60 0.00 0 6,846.39 0.00 27.20 0.00 0 6,846.39 0.00 27.80 0.00 0 6,846.39 0.00 28.40 0.00 0 6,846.39 0.00 29.00 0.00 0 6,846.39 0.00 29.60 0.00 0 6,846.39 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 78HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 56R: POST-CULVERT-01B-2 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,846.39 0.00 0.00 6,846.40 1.12 0.00 6,846.41 2.01 0.01 6,846.42 2.67 0.02 6,846.43 3.21 0.04 6,846.44 3.72 0.07 6,846.45 4.20 0.10 6,846.46 4.64 0.14 6,846.47 5.07 0.19 6,846.48 5.47 0.24 6,846.49 5.86 0.30 6,846.50 6.23 0.36 6,846.51 6.59 0.44 6,846.52 6.93 0.52 6,846.53 7.27 0.61 6,846.54 7.59 0.70 6,846.55 7.91 0.80 6,846.56 8.22 0.91 6,846.57 8.52 1.02 6,846.58 8.81 1.15 6,846.59 9.09 1.28 6,846.60 9.38 1.41 6,846.61 9.65 1.55 6,846.62 9.91 1.70 6,846.63 10.18 1.86 6,846.64 10.43 2.02 6,846.65 10.68 2.19 6,846.66 10.93 2.36 6,846.67 11.17 2.55 6,846.68 11.41 2.74 6,846.69 11.64 2.93 6,846.70 11.87 3.13 6,846.71 12.10 3.34 6,846.72 12.32 3.55 6,846.73 12.53 3.77 6,846.74 12.75 4.00 6,846.75 12.96 4.23 6,846.76 13.16 4.46 6,846.77 13.36 4.71 6,846.78 13.56 4.95 6,846.79 13.76 5.21 6,846.80 13.95 5.47 6,846.81 14.14 5.73 6,846.82 14.33 6.00 6,846.83 14.51 6.27 6,846.84 14.69 6.55 6,846.85 14.87 6.84 6,846.86 15.04 7.13 6,846.87 15.22 7.42 6,846.88 15.39 7.72 6,846.89 15.55 8.02 6,846.90 15.72 8.33 6,846.91 15.88 8.64 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,846.92 16.04 8.96 6,846.93 16.19 9.27 6,846.94 16.35 9.60 6,846.95 16.50 9.93 6,846.96 16.65 10.26 6,846.97 16.79 10.59 6,846.98 16.94 10.93 6,846.99 17.08 11.27 6,847.00 17.22 11.62 6,847.01 17.35 11.97 6,847.02 17.49 12.32 6,847.03 17.62 12.67 6,847.04 17.75 13.03 6,847.05 17.88 13.39 6,847.06 18.00 13.75 6,847.07 18.13 14.12 6,847.08 18.25 14.48 6,847.09 18.37 14.85 6,847.10 18.48 15.22 6,847.11 18.60 15.60 6,847.12 18.71 15.97 6,847.13 18.82 16.35 6,847.14 18.93 16.73 6,847.15 19.04 17.11 6,847.16 19.14 17.49 6,847.17 19.24 17.87 6,847.18 19.34 18.25 6,847.19 19.44 18.63 6,847.20 19.53 19.02 6,847.21 19.63 19.40 6,847.22 19.72 19.79 6,847.23 19.81 20.17 6,847.24 19.90 20.56 6,847.25 19.98 20.94 6,847.26 20.06 21.32 6,847.27 20.14 21.71 6,847.28 20.22 22.09 6,847.29 20.30 22.47 6,847.30 20.37 22.86 6,847.31 20.45 23.24 6,847.32 20.52 23.62 6,847.33 20.59 23.99 6,847.34 20.65 24.37 6,847.35 20.72 24.74 6,847.36 20.78 25.12 6,847.37 20.84 25.49 6,847.38 20.90 25.86 6,847.39 20.95 26.22 6,847.40 21.01 26.58 6,847.41 21.06 26.95 6,847.42 21.11 27.30 6,847.43 21.15 27.66 6,847.44 21.20 28.01 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,847.45 21.24 28.35 6,847.46 21.28 28.70 6,847.47 21.32 29.04 6,847.48 21.35 29.37 6,847.49 21.38 29.70 6,847.50 21.42 30.03 6,847.51 21.44 30.34 6,847.52 21.47 30.66 6,847.53 21.49 30.97 6,847.54 21.51 31.27 6,847.55 21.53 31.57 6,847.56 21.55 31.86 6,847.57 21.56 32.15 6,847.58 21.57 32.43 6,847.59 21.58 32.70 6,847.60 21.58 32.96 6,847.61 21.58 33.22 6,847.62 21.58 33.47 6,847.63 21.57 33.70 6,847.64 21.57 33.93 6,847.65 21.55 34.16 6,847.66 21.54 34.37 6,847.67 21.52 34.57 6,847.68 21.50 34.76 6,847.69 21.47 34.94 6,847.70 21.44 35.11 6,847.71 21.41 35.26 6,847.72 21.37 35.40 6,847.73 21.33 35.53 6,847.74 21.28 35.65 6,847.75 21.23 35.75 6,847.76 21.17 35.83 6,847.77 21.11 35.90 6,847.78 21.04 35.95 6,847.79 20.96 35.97 6,847.80 20.87 35.98 6,847.81 20.78 35.96 6,847.82 20.67 35.91 6,847.83 20.56 35.84 6,847.84 20.42 35.71 6,847.85 20.27 35.55 6,847.86 20.10 35.35 6,847.87 19.87 35.02 6,847.88 19.48 34.39 6,847.89 18.93 33.45 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 79HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 56R: POST-CULVERT-01B-2 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,846.39 0.0 0 6,846.41 0.0 1 6,846.43 0.0 2 6,846.45 0.0 3 6,846.47 0.0 5 6,846.49 0.1 7 6,846.51 0.1 9 6,846.53 0.1 12 6,846.55 0.1 14 6,846.57 0.1 17 6,846.59 0.1 19 6,846.61 0.2 22 6,846.63 0.2 25 6,846.65 0.2 29 6,846.67 0.2 32 6,846.69 0.3 35 6,846.71 0.3 38 6,846.73 0.3 42 6,846.75 0.3 45 6,846.77 0.4 49 6,846.79 0.4 53 6,846.81 0.4 56 6,846.83 0.4 60 6,846.85 0.5 64 6,846.87 0.5 68 6,846.89 0.5 72 6,846.91 0.5 76 6,846.93 0.6 80 6,846.95 0.6 84 6,846.97 0.6 88 6,846.99 0.7 92 6,847.01 0.7 96 6,847.03 0.7 100 6,847.05 0.7 104 6,847.07 0.8 108 6,847.09 0.8 112 6,847.11 0.8 117 6,847.13 0.9 121 6,847.15 0.9 125 6,847.17 0.9 129 6,847.19 1.0 133 6,847.21 1.0 137 6,847.23 1.0 142 6,847.25 1.0 146 6,847.27 1.1 150 6,847.29 1.1 154 6,847.31 1.1 158 6,847.33 1.2 162 6,847.35 1.2 166 6,847.37 1.2 170 6,847.39 1.3 174 6,847.41 1.3 178 6,847.43 1.3 182 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,847.45 1.3 186 6,847.47 1.4 189 6,847.49 1.4 193 6,847.51 1.4 197 6,847.53 1.4 200 6,847.55 1.5 204 6,847.57 1.5 207 6,847.59 1.5 211 6,847.61 1.5 214 6,847.63 1.6 217 6,847.65 1.6 220 6,847.67 1.6 223 6,847.69 1.6 226 6,847.71 1.6 229 6,847.73 1.7 232 6,847.75 1.7 234 6,847.77 1.7 237 6,847.79 1.7 239 6,847.81 1.7 241 6,847.83 1.7 243 6,847.85 1.8 244 6,847.87 1.8 245 6,847.89 1.8 246 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 80HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 57R: POST-CULVERT-01B-3 [52] Hint: Inlet/Outlet conditions not evaluated [61] Hint: Exceeded Reach 56R outlet invert by 0.33' @ 12.05 hrs Inflow Area = 4.446 ac, 29.98% Impervious, Inflow Depth = 1.20" for 100-YR event Inflow = 7.12 cfs @ 12.06 hrs, Volume= 0.445 af Outflow = 7.12 cfs @ 12.06 hrs, Volume= 0.445 af, Atten= 0%, Lag= 0.1 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 17.01 fps, Min. Travel Time= 0.1 min Avg. Velocity = 5.52 fps, Avg. Travel Time= 0.3 min Peak Storage= 43 cf @ 12.06 hrs Average Depth at Peak Storage= 0.43' , Surface Width= 1.36' Bank-Full Depth= 1.50' Flow Area= 1.8 sf, Capacity= 39.81 cfs 18.0" Round Pipe n= 0.012 Corrugated PP, smooth interior Length= 102.2' Slope= 0.1224 '/' Inlet Invert= 6,834.27', Outlet Invert= 6,821.76' Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 81HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 57R: POST-CULVERT-01B-3 Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)7 6 5 4 3 2 1 0 Inflow Area=4.446 ac Avg. Flow Depth=0.43' Max Vel=17.01 fps 18.0" Round Pipe n=0.012 L=102.2' S=0.1224 '/' Capacity=39.81 cfs 7.12 cfs7.12 cfs Reach 57R: POST-CULVERT-01B-3 Primary Stage-Discharge Discharge (cfs) 4035302520151050Depth (feet)1 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 82HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 57R: POST-CULVERT-01B-3 Storage Stage-Storage Storage (cubic-feet) 180160140120100806040200Depth (feet)1 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 83HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 57R: POST-CULVERT-01B-3 Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,834.27 0.00 5.60 0.00 0 6,834.27 0.00 6.20 0.00 0 6,834.27 0.00 6.80 0.00 0 6,834.27 0.00 7.40 0.00 0 6,834.27 0.00 8.00 0.00 0 6,834.27 0.00 8.60 0.00 0 6,834.28 0.00 9.20 0.01 0 6,834.29 0.01 9.80 0.03 1 6,834.30 0.03 10.40 0.06 2 6,834.31 0.06 11.00 0.14 3 6,834.33 0.14 11.60 0.36 5 6,834.37 0.36 12.20 3.78 27 6,834.58 3.82 12.80 0.69 8 6,834.41 0.69 13.40 0.47 6 6,834.38 0.47 14.00 0.35 5 6,834.37 0.35 14.60 0.30 5 6,834.36 0.30 15.20 0.26 4 6,834.36 0.26 15.80 0.23 4 6,834.35 0.23 16.40 0.20 3 6,834.35 0.20 17.00 0.19 3 6,834.34 0.19 17.60 0.18 3 6,834.34 0.18 18.20 0.16 3 6,834.34 0.16 18.80 0.15 3 6,834.34 0.15 19.40 0.14 3 6,834.33 0.14 20.00 0.12 2 6,834.33 0.12 20.60 0.12 2 6,834.33 0.12 21.20 0.12 2 6,834.33 0.12 21.80 0.11 2 6,834.33 0.11 22.40 0.11 2 6,834.33 0.11 23.00 0.11 2 6,834.33 0.11 23.60 0.11 2 6,834.33 0.11 24.20 0.05 1 6,834.31 0.05 24.80 0.00 0 6,834.27 0.00 25.40 0.00 0 6,834.27 0.00 26.00 0.00 0 6,834.27 0.00 26.60 0.00 0 6,834.27 0.00 27.20 0.00 0 6,834.27 0.00 27.80 0.00 0 6,834.27 0.00 28.40 0.00 0 6,834.27 0.00 29.00 0.00 0 6,834.27 0.00 29.60 0.00 0 6,834.27 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 84HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 57R: POST-CULVERT-01B-3 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,834.27 0.00 0.00 6,834.28 1.34 0.00 6,834.29 2.39 0.01 6,834.30 3.17 0.03 6,834.31 3.82 0.05 6,834.32 4.43 0.08 6,834.33 5.00 0.12 6,834.34 5.53 0.17 6,834.35 6.03 0.22 6,834.36 6.51 0.28 6,834.37 6.97 0.35 6,834.38 7.41 0.43 6,834.39 7.84 0.52 6,834.40 8.25 0.62 6,834.41 8.65 0.72 6,834.42 9.04 0.83 6,834.43 9.41 0.95 6,834.44 9.78 1.08 6,834.45 10.14 1.22 6,834.46 10.48 1.37 6,834.47 10.82 1.52 6,834.48 11.16 1.68 6,834.49 11.48 1.85 6,834.50 11.80 2.03 6,834.51 12.11 2.21 6,834.52 12.42 2.41 6,834.53 12.72 2.61 6,834.54 13.01 2.81 6,834.55 13.30 3.03 6,834.56 13.58 3.26 6,834.57 13.86 3.49 6,834.58 14.13 3.73 6,834.59 14.40 3.97 6,834.60 14.66 4.23 6,834.61 14.92 4.49 6,834.62 15.17 4.76 6,834.63 15.42 5.03 6,834.64 15.66 5.31 6,834.65 15.91 5.60 6,834.66 16.14 5.89 6,834.67 16.38 6.20 6,834.68 16.60 6.50 6,834.69 16.83 6.82 6,834.70 17.05 7.14 6,834.71 17.27 7.47 6,834.72 17.49 7.80 6,834.73 17.70 8.14 6,834.74 17.91 8.48 6,834.75 18.11 8.83 6,834.76 18.31 9.19 6,834.77 18.51 9.55 6,834.78 18.71 9.91 6,834.79 18.90 10.28 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,834.80 19.09 10.66 6,834.81 19.27 11.04 6,834.82 19.45 11.42 6,834.83 19.63 11.81 6,834.84 19.81 12.21 6,834.85 19.99 12.61 6,834.86 20.16 13.01 6,834.87 20.33 13.42 6,834.88 20.49 13.83 6,834.89 20.65 14.24 6,834.90 20.81 14.66 6,834.91 20.97 15.08 6,834.92 21.13 15.51 6,834.93 21.28 15.94 6,834.94 21.43 16.37 6,834.95 21.57 16.80 6,834.96 21.72 17.24 6,834.97 21.86 17.68 6,834.98 22.00 18.12 6,834.99 22.14 18.56 6,835.00 22.27 19.01 6,835.01 22.40 19.46 6,835.02 22.53 19.91 6,835.03 22.66 20.36 6,835.04 22.78 20.81 6,835.05 22.90 21.27 6,835.06 23.02 21.72 6,835.07 23.14 22.18 6,835.08 23.25 22.63 6,835.09 23.36 23.09 6,835.10 23.47 23.55 6,835.11 23.58 24.01 6,835.12 23.68 24.46 6,835.13 23.78 24.92 6,835.14 23.88 25.38 6,835.15 23.98 25.84 6,835.16 24.07 26.29 6,835.17 24.16 26.75 6,835.18 24.25 27.20 6,835.19 24.34 27.66 6,835.20 24.42 28.11 6,835.21 24.50 28.56 6,835.22 24.58 29.00 6,835.23 24.66 29.45 6,835.24 24.73 29.89 6,835.25 24.80 30.34 6,835.26 24.87 30.77 6,835.27 24.94 31.21 6,835.28 25.00 31.64 6,835.29 25.06 32.07 6,835.30 25.12 32.49 6,835.31 25.17 32.92 6,835.32 25.23 33.33 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,835.33 25.28 33.75 6,835.34 25.33 34.15 6,835.35 25.37 34.56 6,835.36 25.41 34.95 6,835.37 25.45 35.35 6,835.38 25.49 35.74 6,835.39 25.52 36.12 6,835.40 25.55 36.49 6,835.41 25.58 36.86 6,835.42 25.60 37.22 6,835.43 25.62 37.57 6,835.44 25.64 37.92 6,835.45 25.66 38.26 6,835.46 25.67 38.59 6,835.47 25.68 38.92 6,835.48 25.68 39.23 6,835.49 25.68 39.53 6,835.50 25.68 39.83 6,835.51 25.68 40.11 6,835.52 25.67 40.39 6,835.53 25.65 40.65 6,835.54 25.64 40.90 6,835.55 25.61 41.14 6,835.56 25.59 41.37 6,835.57 25.56 41.58 6,835.58 25.52 41.78 6,835.59 25.48 41.97 6,835.60 25.44 42.14 6,835.61 25.39 42.29 6,835.62 25.33 42.43 6,835.63 25.27 42.55 6,835.64 25.20 42.65 6,835.65 25.12 42.73 6,835.66 25.04 42.78 6,835.67 24.94 42.81 6,835.68 24.84 42.83 6,835.69 24.73 42.80 6,835.70 24.60 42.74 6,835.71 24.47 42.66 6,835.72 24.30 42.51 6,835.73 24.12 42.31 6,835.74 23.92 42.07 6,835.75 23.65 41.68 6,835.76 23.19 40.93 6,835.77 22.53 39.81 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 85HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 57R: POST-CULVERT-01B-3 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,834.27 0.0 0 6,834.29 0.0 0 6,834.31 0.0 1 6,834.33 0.0 2 6,834.35 0.0 4 6,834.37 0.1 5 6,834.39 0.1 7 6,834.41 0.1 9 6,834.43 0.1 10 6,834.45 0.1 12 6,834.47 0.1 14 6,834.49 0.2 16 6,834.51 0.2 19 6,834.53 0.2 21 6,834.55 0.2 23 6,834.57 0.3 26 6,834.59 0.3 28 6,834.61 0.3 31 6,834.63 0.3 33 6,834.65 0.4 36 6,834.67 0.4 39 6,834.69 0.4 41 6,834.71 0.4 44 6,834.73 0.5 47 6,834.75 0.5 50 6,834.77 0.5 53 6,834.79 0.5 56 6,834.81 0.6 59 6,834.83 0.6 61 6,834.85 0.6 64 6,834.87 0.7 67 6,834.89 0.7 70 6,834.91 0.7 73 6,834.93 0.7 77 6,834.95 0.8 80 6,834.97 0.8 83 6,834.99 0.8 86 6,835.01 0.9 89 6,835.03 0.9 92 6,835.05 0.9 95 6,835.07 1.0 98 6,835.09 1.0 101 6,835.11 1.0 104 6,835.13 1.0 107 6,835.15 1.1 110 6,835.17 1.1 113 6,835.19 1.1 116 6,835.21 1.2 119 6,835.23 1.2 122 6,835.25 1.2 125 6,835.27 1.3 128 6,835.29 1.3 131 6,835.31 1.3 134 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,835.33 1.3 136 6,835.35 1.4 139 6,835.37 1.4 142 6,835.39 1.4 145 6,835.41 1.4 147 6,835.43 1.5 150 6,835.45 1.5 152 6,835.47 1.5 155 6,835.49 1.5 157 6,835.51 1.6 160 6,835.53 1.6 162 6,835.55 1.6 164 6,835.57 1.6 166 6,835.59 1.6 168 6,835.61 1.7 170 6,835.63 1.7 172 6,835.65 1.7 174 6,835.67 1.7 175 6,835.69 1.7 177 6,835.71 1.7 178 6,835.73 1.8 179 6,835.75 1.8 180 6,835.77 1.8 181 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 86HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 59R: POST-REACH-01B Inflow Area = 2.123 ac, 24.18% Impervious, Inflow Depth = 1.20" for 100-YR event Inflow = 2.77 cfs @ 12.13 hrs, Volume= 0.213 af Outflow = 2.76 cfs @ 12.15 hrs, Volume= 0.213 af, Atten= 0%, Lag= 0.9 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 4.06 fps, Min. Travel Time= 1.2 min Avg. Velocity = 1.64 fps, Avg. Travel Time= 2.9 min Peak Storage= 191 cf @ 12.15 hrs Average Depth at Peak Storage= 0.50' , Surface Width= 2.73' Bank-Full Depth= 1.00' Flow Area= 2.8 sf, Capacity= 17.78 cfs 0.00' x 1.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 3.0 2.5 '/' Top Width= 5.50' Length= 280.8' Slope= 0.0467 '/' Inlet Invert= 6,837.54', Outlet Invert= 6,824.43' Reach 59R: POST-REACH-01B Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)3 2 1 0 Inflow Area=2.123 ac Avg. Flow Depth=0.50' Max Vel=4.06 fps n=0.030 L=280.8' S=0.0467 '/' Capacity=17.78 cfs 2.77 cfs2.76 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 87HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 59R: POST-REACH-01B Primary Stage-Discharge Discharge (cfs) 1614121086420Depth (feet)1 0 Reach 59R: POST-REACH-01B Storage Stage-Storage Storage (cubic-feet) 750700650600550500450400350300250200150100500Depth (feet)1 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 88HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 59R: POST-REACH-01B Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,837.54 0.00 5.60 0.00 0 6,837.54 0.00 6.20 0.00 0 6,837.54 0.00 6.80 0.00 0 6,837.54 0.00 7.40 0.00 0 6,837.54 0.00 8.00 0.00 0 6,837.54 0.00 8.60 0.00 0 6,837.54 0.00 9.20 0.00 1 6,837.58 0.00 9.80 0.01 3 6,837.60 0.01 10.40 0.03 6 6,837.63 0.03 11.00 0.06 10 6,837.65 0.06 11.60 0.15 20 6,837.70 0.14 12.20 2.50 182 6,838.03 2.59 12.80 0.40 46 6,837.79 0.42 13.40 0.24 31 6,837.74 0.24 14.00 0.18 24 6,837.72 0.18 14.60 0.14 21 6,837.70 0.15 15.20 0.13 19 6,837.70 0.13 15.80 0.11 17 6,837.69 0.11 16.40 0.10 16 6,837.68 0.10 17.00 0.09 15 6,837.68 0.09 17.60 0.08 14 6,837.67 0.09 18.20 0.08 13 6,837.67 0.08 18.80 0.07 13 6,837.67 0.07 19.40 0.07 12 6,837.66 0.07 20.00 0.06 11 6,837.66 0.06 20.60 0.06 10 6,837.66 0.06 21.20 0.06 10 6,837.65 0.06 21.80 0.05 10 6,837.65 0.05 22.40 0.05 10 6,837.65 0.05 23.00 0.05 10 6,837.65 0.05 23.60 0.05 10 6,837.65 0.05 24.20 0.04 8 6,837.64 0.04 24.80 0.00 1 6,837.57 0.00 25.40 0.00 0 6,837.55 0.00 26.00 0.00 0 6,837.54 0.00 26.60 0.00 0 6,837.54 0.00 27.20 0.00 0 6,837.54 0.00 27.80 0.00 0 6,837.54 0.00 28.40 0.00 0 6,837.54 0.00 29.00 0.00 0 6,837.54 0.00 29.60 0.00 0 6,837.54 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 89HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 59R: POST-REACH-01B Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,837.54 0.00 0.00 6,837.55 0.30 0.00 6,837.56 0.48 0.00 6,837.57 0.62 0.00 6,837.58 0.76 0.00 6,837.59 0.88 0.01 6,837.60 0.99 0.01 6,837.61 1.10 0.01 6,837.62 1.20 0.02 6,837.63 1.30 0.03 6,837.64 1.39 0.04 6,837.65 1.48 0.05 6,837.66 1.57 0.06 6,837.67 1.66 0.08 6,837.68 1.74 0.09 6,837.69 1.83 0.11 6,837.70 1.91 0.13 6,837.71 1.98 0.16 6,837.72 2.06 0.18 6,837.73 2.14 0.21 6,837.74 2.21 0.24 6,837.75 2.28 0.28 6,837.76 2.36 0.31 6,837.77 2.43 0.35 6,837.78 2.50 0.40 6,837.79 2.57 0.44 6,837.80 2.63 0.49 6,837.81 2.70 0.54 6,837.82 2.77 0.60 6,837.83 2.83 0.66 6,837.84 2.90 0.72 6,837.85 2.96 0.78 6,837.86 3.03 0.85 6,837.87 3.09 0.92 6,837.88 3.15 1.00 6,837.89 3.21 1.08 6,837.90 3.27 1.17 6,837.91 3.33 1.25 6,837.92 3.39 1.35 6,837.93 3.45 1.44 6,837.94 3.51 1.54 6,837.95 3.57 1.65 6,837.96 3.63 1.76 6,837.97 3.68 1.87 6,837.98 3.74 1.99 6,837.99 3.80 2.11 6,838.00 3.85 2.24 6,838.01 3.91 2.37 6,838.02 3.96 2.51 6,838.03 4.02 2.65 6,838.04 4.07 2.80 6,838.05 4.13 2.95 6,838.06 4.18 3.11 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,838.07 4.24 3.27 6,838.08 4.29 3.44 6,838.09 4.34 3.61 6,838.10 4.39 3.79 6,838.11 4.45 3.97 6,838.12 4.50 4.16 6,838.13 4.55 4.35 6,838.14 4.60 4.55 6,838.15 4.65 4.76 6,838.16 4.70 4.97 6,838.17 4.75 5.19 6,838.18 4.80 5.41 6,838.19 4.85 5.64 6,838.20 4.90 5.87 6,838.21 4.95 6.11 6,838.22 5.00 6.36 6,838.23 5.05 6.61 6,838.24 5.10 6.87 6,838.25 5.15 7.14 6,838.26 5.20 7.41 6,838.27 5.24 7.68 6,838.28 5.29 7.97 6,838.29 5.34 8.26 6,838.30 5.39 8.55 6,838.31 5.43 8.86 6,838.32 5.48 9.17 6,838.33 5.53 9.49 6,838.34 5.57 9.81 6,838.35 5.62 10.14 6,838.36 5.67 10.48 6,838.37 5.71 10.82 6,838.38 5.76 11.17 6,838.39 5.80 11.53 6,838.40 5.85 11.90 6,838.41 5.89 12.27 6,838.42 5.94 12.65 6,838.43 5.98 13.03 6,838.44 6.03 13.43 6,838.45 6.07 13.83 6,838.46 6.12 14.24 6,838.47 6.16 14.66 6,838.48 6.21 15.08 6,838.49 6.25 15.51 6,838.50 6.29 15.95 6,838.51 6.34 16.40 6,838.52 6.38 16.85 6,838.53 6.42 17.31 6,838.54 6.47 17.78 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 90HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 59R: POST-REACH-01B Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,837.54 0.0 0 6,837.55 0.0 0 6,837.56 0.0 0 6,837.57 0.0 1 6,837.58 0.0 1 6,837.59 0.0 2 6,837.60 0.0 3 6,837.61 0.0 4 6,837.62 0.0 5 6,837.63 0.0 6 6,837.64 0.0 8 6,837.65 0.0 9 6,837.66 0.0 11 6,837.67 0.0 13 6,837.68 0.1 15 6,837.69 0.1 17 6,837.70 0.1 20 6,837.71 0.1 22 6,837.72 0.1 25 6,837.73 0.1 28 6,837.74 0.1 31 6,837.75 0.1 34 6,837.76 0.1 37 6,837.77 0.1 41 6,837.78 0.2 44 6,837.79 0.2 48 6,837.80 0.2 52 6,837.81 0.2 56 6,837.82 0.2 61 6,837.83 0.2 65 6,837.84 0.2 69 6,837.85 0.3 74 6,837.86 0.3 79 6,837.87 0.3 84 6,837.88 0.3 89 6,837.89 0.3 95 6,837.90 0.4 100 6,837.91 0.4 106 6,837.92 0.4 112 6,837.93 0.4 117 6,837.94 0.4 124 6,837.95 0.5 130 6,837.96 0.5 136 6,837.97 0.5 143 6,837.98 0.5 149 6,837.99 0.6 156 6,838.00 0.6 163 6,838.01 0.6 171 6,838.02 0.6 178 6,838.03 0.7 185 6,838.04 0.7 193 6,838.05 0.7 201 6,838.06 0.7 209 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,838.07 0.8 217 6,838.08 0.8 225 6,838.09 0.8 234 6,838.10 0.9 242 6,838.11 0.9 251 6,838.12 0.9 260 6,838.13 1.0 269 6,838.14 1.0 278 6,838.15 1.0 287 6,838.16 1.1 297 6,838.17 1.1 306 6,838.18 1.1 316 6,838.19 1.2 326 6,838.20 1.2 336 6,838.21 1.2 347 6,838.22 1.3 357 6,838.23 1.3 368 6,838.24 1.3 378 6,838.25 1.4 389 6,838.26 1.4 400 6,838.27 1.5 412 6,838.28 1.5 423 6,838.29 1.5 434 6,838.30 1.6 446 6,838.31 1.6 458 6,838.32 1.7 470 6,838.33 1.7 482 6,838.34 1.8 494 6,838.35 1.8 507 6,838.36 1.8 519 6,838.37 1.9 532 6,838.38 1.9 545 6,838.39 2.0 558 6,838.40 2.0 571 6,838.41 2.1 584 6,838.42 2.1 598 6,838.43 2.2 612 6,838.44 2.2 625 6,838.45 2.3 639 6,838.46 2.3 654 6,838.47 2.4 668 6,838.48 2.4 682 6,838.49 2.5 697 6,838.50 2.5 712 6,838.51 2.6 727 6,838.52 2.6 742 6,838.53 2.7 757 6,838.54 2.8 772 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 91HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 61R: POST-REACH-01B-4 Inflow Area = 8.507 ac, 30.05% Impervious, Inflow Depth = 1.21" for 100-YR event Inflow = 12.63 cfs @ 12.07 hrs, Volume= 0.860 af Outflow = 12.63 cfs @ 12.08 hrs, Volume= 0.860 af, Atten= 0%, Lag= 0.1 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 5.38 fps, Min. Travel Time= 0.2 min Avg. Velocity = 1.85 fps, Avg. Travel Time= 0.5 min Peak Storage= 133 cf @ 12.08 hrs Average Depth at Peak Storage= 0.20' , Surface Width= 19.79' Bank-Full Depth= 0.50' Flow Area= 12.0 sf, Capacity= 112.36 cfs 4.00' x 0.50' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 40.0 '/' Top Width= 44.00' Length= 56.7' Slope= 0.2021 '/' Inlet Invert= 6,820.46', Outlet Invert= 6,809.00' ‡ Reach 61R: POST-REACH-01B-4 Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=8.507 ac Avg. Flow Depth=0.20' Max Vel=5.38 fps n=0.030 L=56.7' S=0.2021 '/' Capacity=112.36 cfs 12.63 cfs12.63 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 92HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 61R: POST-REACH-01B-4 Primary Stage-Discharge Discharge (cfs) 1101009080706050403020100Depth (feet)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Reach 61R: POST-REACH-01B-4 Storage Stage-Storage Storage (cubic-feet) 650600550500450400350300250200150100500Depth (feet)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 93HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 61R: POST-REACH-01B-4 Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,820.46 0.00 5.60 0.00 0 6,820.46 0.00 6.20 0.00 0 6,820.46 0.00 6.80 0.00 0 6,820.46 0.00 7.40 0.00 0 6,820.46 0.00 8.00 0.00 0 6,820.46 0.00 8.60 0.01 0 6,820.46 0.00 9.20 0.02 2 6,820.47 0.02 9.80 0.06 3 6,820.47 0.06 10.40 0.12 5 6,820.48 0.12 11.00 0.26 8 6,820.49 0.26 11.60 0.67 16 6,820.51 0.66 12.20 8.25 98 6,820.62 8.36 12.80 1.43 27 6,820.53 1.43 13.40 0.92 20 6,820.52 0.92 14.00 0.69 16 6,820.51 0.69 14.60 0.58 14 6,820.50 0.58 15.20 0.51 13 6,820.50 0.51 15.80 0.44 12 6,820.50 0.44 16.40 0.39 11 6,820.50 0.39 17.00 0.36 10 6,820.49 0.36 17.60 0.34 10 6,820.49 0.34 18.20 0.32 9 6,820.49 0.32 18.80 0.29 9 6,820.49 0.29 19.40 0.27 8 6,820.49 0.27 20.00 0.24 8 6,820.49 0.24 20.60 0.23 7 6,820.49 0.23 21.20 0.22 7 6,820.49 0.22 21.80 0.22 7 6,820.49 0.22 22.40 0.21 7 6,820.49 0.21 23.00 0.21 7 6,820.48 0.21 23.60 0.20 7 6,820.48 0.20 24.20 0.12 5 6,820.48 0.13 24.80 0.00 0 6,820.46 0.00 25.40 0.00 0 6,820.46 0.00 26.00 0.00 0 6,820.46 0.00 26.60 0.00 0 6,820.46 0.00 27.20 0.00 0 6,820.46 0.00 27.80 0.00 0 6,820.46 0.00 28.40 0.00 0 6,820.46 0.00 29.00 0.00 0 6,820.46 0.00 29.60 0.00 0 6,820.46 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 94HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 61R: POST-REACH-01B-4 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,820.46 0.00 0.00 6,820.47 0.98 0.04 6,820.48 1.48 0.14 6,820.49 1.87 0.29 6,820.50 2.20 0.49 6,820.51 2.49 0.75 6,820.52 2.76 1.06 6,820.53 3.01 1.43 6,820.54 3.24 1.86 6,820.55 3.45 2.36 6,820.56 3.66 2.93 6,820.57 3.86 3.57 6,820.58 4.05 4.28 6,820.59 4.24 5.07 6,820.60 4.42 5.94 6,820.61 4.59 6.89 6,820.62 4.77 7.93 6,820.63 4.93 9.06 6,820.64 5.10 10.28 6,820.65 5.26 11.59 6,820.66 5.42 13.00 6,820.67 5.57 14.51 6,820.68 5.72 16.12 6,820.69 5.87 17.84 6,820.70 6.02 19.66 6,820.71 6.17 21.59 6,820.72 6.31 23.63 6,820.73 6.45 25.79 6,820.74 6.60 28.07 6,820.75 6.73 30.46 6,820.76 6.87 32.98 6,820.77 7.01 35.62 6,820.78 7.14 38.39 6,820.79 7.27 41.28 6,820.80 7.40 44.31 6,820.81 7.53 47.47 6,820.82 7.66 50.77 6,820.83 7.79 54.20 6,820.84 7.92 57.77 6,820.85 8.04 61.49 6,820.86 8.17 65.35 6,820.87 8.29 69.35 6,820.88 8.41 73.51 6,820.89 8.54 77.82 6,820.90 8.66 82.28 6,820.91 8.78 86.89 6,820.92 8.90 91.66 6,820.93 9.01 96.59 6,820.94 9.13 101.68 6,820.95 9.25 106.94 6,820.96 9.36 112.36 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 95HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 61R: POST-REACH-01B-4 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,820.46 0.0 0 6,820.47 0.0 2 6,820.48 0.1 5 6,820.49 0.2 9 6,820.50 0.2 13 6,820.51 0.3 17 6,820.52 0.4 22 6,820.53 0.5 27 6,820.54 0.6 33 6,820.55 0.7 39 6,820.56 0.8 45 6,820.57 0.9 52 6,820.58 1.1 60 6,820.59 1.2 68 6,820.60 1.3 76 6,820.61 1.5 85 6,820.62 1.7 94 6,820.63 1.8 104 6,820.64 2.0 114 6,820.65 2.2 125 6,820.66 2.4 136 6,820.67 2.6 148 6,820.68 2.8 160 6,820.69 3.0 172 6,820.70 3.3 185 6,820.71 3.5 198 6,820.72 3.7 212 6,820.73 4.0 227 6,820.74 4.3 241 6,820.75 4.5 257 6,820.76 4.8 272 6,820.77 5.1 288 6,820.78 5.4 305 6,820.79 5.7 322 6,820.80 6.0 339 6,820.81 6.3 357 6,820.82 6.6 376 6,820.83 7.0 394 6,820.84 7.3 414 6,820.85 7.6 433 6,820.86 8.0 454 6,820.87 8.4 474 6,820.88 8.7 495 6,820.89 9.1 517 6,820.90 9.5 539 6,820.91 9.9 561 6,820.92 10.3 584 6,820.93 10.7 608 6,820.94 11.1 631 6,820.95 11.6 656 6,820.96 12.0 680 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 96HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Pond 52P: POST-CULVERT-01A [57] Hint: Peaked at 6,840.05' (Flood elevation advised) Inflow Area = 2.123 ac, 24.18% Impervious, Inflow Depth = 1.20" for 100-YR event Inflow = 2.77 cfs @ 12.13 hrs, Volume= 0.213 af Outflow = 2.77 cfs @ 12.13 hrs, Volume= 0.213 af, Atten= 0%, Lag= 0.0 min Primary = 2.77 cfs @ 12.13 hrs, Volume= 0.213 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Peak Elev= 6,840.05' @ 12.13 hrs Device Routing Invert Outlet Devices #1 Primary 6,839.01'12.0" Round Culvert L= 57.2' CPP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 6,839.01' / 6,837.54' S= 0.0257 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 0.79 sf Primary OutFlow Max=2.76 cfs @ 12.13 hrs HW=6,840.04' TW=6,838.04' (Dynamic Tailwater) 1=Culvert (Inlet Controls 2.76 cfs @ 3.51 fps) Pond 52P: POST-CULVERT-01A Inflow Primary Hydrograph Time (hours) 2826242220181614121086Flow (cfs)3 2 1 0 Inflow Area=2.123 ac Peak Elev=6,840.05' 12.0" Round Culvert n=0.012 L=57.2' S=0.0257 '/' 2.77 cfs2.77 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 97HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Pond 52P: POST-CULVERT-01A Primary Stage-Discharge Discharge (cfs) 210Elevation (feet)6,840 Culvert Pond 52P: POST-CULVERT-01A Storage Stage-Area-Storage Storage (acre-feet) 0Elevation (feet)6,840 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 98HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Pond 52P: POST-CULVERT-01A Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 5.00 0.00 6,839.01 0.00 5.30 0.00 6,839.01 0.00 5.60 0.00 6,839.01 0.00 5.90 0.00 6,839.01 0.00 6.20 0.00 6,839.01 0.00 6.50 0.00 6,839.01 0.00 6.80 0.00 6,839.01 0.00 7.10 0.00 6,839.01 0.00 7.40 0.00 6,839.01 0.00 7.70 0.00 6,839.01 0.00 8.00 0.00 6,839.01 0.00 8.30 0.00 6,839.01 0.00 8.60 0.00 6,839.01 0.00 8.90 0.00 6,839.02 0.00 9.20 0.00 6,839.04 0.00 9.50 0.01 6,839.05 0.01 9.80 0.01 6,839.06 0.01 10.10 0.02 6,839.07 0.02 10.40 0.03 6,839.09 0.03 10.70 0.04 6,839.10 0.04 11.00 0.06 6,839.13 0.06 11.30 0.09 6,839.15 0.09 11.60 0.15 6,839.19 0.15 11.90 0.88 6,839.49 0.88 12.20 2.50 6,839.94 2.50 12.50 0.81 6,839.47 0.81 12.80 0.40 6,839.32 0.40 13.10 0.29 6,839.27 0.29 13.40 0.24 6,839.25 0.24 13.70 0.20 6,839.23 0.20 14.00 0.18 6,839.21 0.18 14.30 0.16 6,839.20 0.16 14.60 0.14 6,839.19 0.14 14.90 0.14 6,839.19 0.14 15.20 0.13 6,839.18 0.13 15.50 0.12 6,839.18 0.12 15.80 0.11 6,839.17 0.11 16.10 0.10 6,839.16 0.10 16.40 0.10 6,839.16 0.10 16.70 0.09 6,839.16 0.09 17.00 0.09 6,839.15 0.09 17.30 0.09 6,839.15 0.09 17.60 0.08 6,839.15 0.08 17.90 0.08 6,839.15 0.08 18.20 0.08 6,839.14 0.08 18.50 0.08 6,839.14 0.08 18.80 0.07 6,839.14 0.07 19.10 0.07 6,839.14 0.07 19.40 0.07 6,839.13 0.07 19.70 0.06 6,839.13 0.06 20.00 0.06 6,839.13 0.06 20.30 0.06 6,839.12 0.06 20.60 0.06 6,839.12 0.06 Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 20.90 0.06 6,839.12 0.06 21.20 0.06 6,839.12 0.06 21.50 0.05 6,839.12 0.05 21.80 0.05 6,839.12 0.05 22.10 0.05 6,839.12 0.05 22.40 0.05 6,839.12 0.05 22.70 0.05 6,839.12 0.05 23.00 0.05 6,839.12 0.05 23.30 0.05 6,839.12 0.05 23.60 0.05 6,839.12 0.05 23.90 0.05 6,839.12 0.05 24.20 0.04 6,839.10 0.04 24.50 0.00 6,839.04 0.00 24.80 0.00 6,839.02 0.00 25.10 0.00 6,839.01 0.00 25.40 0.00 6,839.01 0.00 25.70 0.00 6,839.01 0.00 26.00 0.00 6,839.01 0.00 26.30 0.00 6,839.01 0.00 26.60 0.00 6,839.01 0.00 26.90 0.00 6,839.01 0.00 27.20 0.00 6,839.01 0.00 27.50 0.00 6,839.01 0.00 27.80 0.00 6,839.01 0.00 28.10 0.00 6,839.01 0.00 28.40 0.00 6,839.01 0.00 28.70 0.00 6,839.01 0.00 29.00 0.00 6,839.01 0.00 29.30 0.00 6,839.01 0.00 29.60 0.00 6,839.01 0.00 29.90 0.00 6,839.01 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 99HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Pond 52P: POST-CULVERT-01A Elevation (feet) Primary (cfs) 6,839.01 0.00 6,839.02 0.00 6,839.03 0.00 6,839.04 0.00 6,839.05 0.01 6,839.06 0.01 6,839.07 0.02 6,839.08 0.02 6,839.09 0.03 6,839.10 0.04 6,839.11 0.04 6,839.12 0.05 6,839.13 0.06 6,839.14 0.07 6,839.15 0.09 6,839.16 0.10 6,839.17 0.11 6,839.18 0.12 6,839.19 0.14 6,839.20 0.15 6,839.21 0.17 6,839.22 0.19 6,839.23 0.20 6,839.24 0.22 6,839.25 0.24 6,839.26 0.26 6,839.27 0.28 6,839.28 0.30 6,839.29 0.32 6,839.30 0.35 6,839.31 0.37 6,839.32 0.39 6,839.33 0.42 6,839.34 0.44 6,839.35 0.47 6,839.36 0.49 6,839.37 0.52 6,839.38 0.55 6,839.39 0.57 6,839.40 0.60 6,839.41 0.63 6,839.42 0.66 6,839.43 0.69 6,839.44 0.72 6,839.45 0.75 6,839.46 0.78 6,839.47 0.81 6,839.48 0.85 6,839.49 0.88 6,839.50 0.91 6,839.51 0.95 6,839.52 0.98 6,839.53 1.01 Elevation (feet) Primary (cfs) 6,839.54 1.05 6,839.55 1.08 6,839.56 1.12 6,839.57 1.15 6,839.58 1.19 6,839.59 1.22 6,839.60 1.26 6,839.61 1.30 6,839.62 1.33 6,839.63 1.37 6,839.64 1.41 6,839.65 1.45 6,839.66 1.48 6,839.67 1.52 6,839.68 1.56 6,839.69 1.60 6,839.70 1.63 6,839.71 1.67 6,839.72 1.71 6,839.73 1.75 6,839.74 1.79 6,839.75 1.83 6,839.76 1.86 6,839.77 1.90 6,839.78 1.94 6,839.79 1.98 6,839.80 2.01 6,839.81 2.05 6,839.82 2.09 6,839.83 2.13 6,839.84 2.16 6,839.85 2.20 6,839.86 2.23 6,839.87 2.27 6,839.88 2.30 6,839.89 2.34 6,839.90 2.37 6,839.91 2.40 6,839.92 2.44 6,839.93 2.47 6,839.94 2.50 6,839.95 2.53 6,839.96 2.56 6,839.97 2.58 6,839.98 2.61 6,839.99 2.63 6,840.00 2.66 6,840.01 2.67 6,840.02 2.70 6,840.03 2.73 6,840.04 2.75 6,840.05 2.78 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 100HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 52P: POST-CULVERT-01A Elevation (feet) Storage (acre-feet) 6,839.01 0.000 6,839.02 0.000 6,839.03 0.000 6,839.04 0.000 6,839.05 0.000 6,839.06 0.000 6,839.07 0.000 6,839.08 0.000 6,839.09 0.000 6,839.10 0.000 6,839.11 0.000 6,839.12 0.000 6,839.13 0.000 6,839.14 0.000 6,839.15 0.000 6,839.16 0.000 6,839.17 0.000 6,839.18 0.000 6,839.19 0.000 6,839.20 0.000 6,839.21 0.000 6,839.22 0.000 6,839.23 0.000 6,839.24 0.000 6,839.25 0.000 6,839.26 0.000 6,839.27 0.000 6,839.28 0.000 6,839.29 0.000 6,839.30 0.000 6,839.31 0.000 6,839.32 0.000 6,839.33 0.000 6,839.34 0.000 6,839.35 0.000 6,839.36 0.000 6,839.37 0.000 6,839.38 0.000 6,839.39 0.000 6,839.40 0.000 6,839.41 0.000 6,839.42 0.000 6,839.43 0.000 6,839.44 0.000 6,839.45 0.000 6,839.46 0.000 6,839.47 0.000 6,839.48 0.000 6,839.49 0.000 6,839.50 0.000 6,839.51 0.000 6,839.52 0.000 6,839.53 0.000 Elevation (feet) Storage (acre-feet) 6,839.54 0.000 6,839.55 0.000 6,839.56 0.000 6,839.57 0.000 6,839.58 0.000 6,839.59 0.000 6,839.60 0.000 6,839.61 0.000 6,839.62 0.000 6,839.63 0.000 6,839.64 0.000 6,839.65 0.000 6,839.66 0.000 6,839.67 0.000 6,839.68 0.000 6,839.69 0.000 6,839.70 0.000 6,839.71 0.000 6,839.72 0.000 6,839.73 0.000 6,839.74 0.000 6,839.75 0.000 6,839.76 0.000 6,839.77 0.000 6,839.78 0.000 6,839.79 0.000 6,839.80 0.000 6,839.81 0.000 6,839.82 0.000 6,839.83 0.000 6,839.84 0.000 6,839.85 0.000 6,839.86 0.000 6,839.87 0.000 6,839.88 0.000 6,839.89 0.000 6,839.90 0.000 6,839.91 0.000 6,839.92 0.000 6,839.93 0.000 6,839.94 0.000 6,839.95 0.000 6,839.96 0.000 6,839.97 0.000 6,839.98 0.000 6,839.99 0.000 6,840.00 0.000 6,840.01 0.000 6,840.02 0.000 6,840.03 0.000 6,840.04 0.000 6,840.05 0.000 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 101HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Pond 55P: POST-CULVERT-01B-1 [57] Hint: Peaked at 6,848.42' (Flood elevation advised) Inflow Area = 3.410 ac, 27.24% Impervious, Inflow Depth = 1.15" for 100-YR event Inflow = 5.21 cfs @ 12.06 hrs, Volume= 0.326 af Outflow = 5.21 cfs @ 12.06 hrs, Volume= 0.326 af, Atten= 0%, Lag= 0.0 min Primary = 5.21 cfs @ 12.06 hrs, Volume= 0.326 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Peak Elev= 6,848.42' @ 12.06 hrs Device Routing Invert Outlet Devices #1 Primary 6,847.28'18.0" Round Culvert L= 39.7' CPP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 6,847.28' / 6,846.49' S= 0.0199 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 1.77 sf Primary OutFlow Max=5.17 cfs @ 12.06 hrs HW=6,848.41' TW=6,846.79' (Dynamic Tailwater) 1=Culvert (Inlet Controls 5.17 cfs @ 3.62 fps) Pond 55P: POST-CULVERT-01B-1 Inflow Primary Hydrograph Time (hours) 2826242220181614121086Flow (cfs)5 4 3 2 1 0 Inflow Area=3.410 ac Peak Elev=6,848.42' 18.0" Round Culvert n=0.012 L=39.7' S=0.0199 '/' 5.21 cfs5.21 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 102HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Pond 55P: POST-CULVERT-01B-1 Primary Stage-Discharge Discharge (cfs) 76543210Elevation (feet)6,848 Culvert Pond 55P: POST-CULVERT-01B-1 Storage Stage-Area-Storage Storage (acre-feet) 0Elevation (feet)6,848 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 103HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Pond 55P: POST-CULVERT-01B-1 Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 5.00 0.00 6,847.28 0.00 5.30 0.00 6,847.28 0.00 5.60 0.00 6,847.28 0.00 5.90 0.00 6,847.28 0.00 6.20 0.00 6,847.28 0.00 6.50 0.00 6,847.28 0.00 6.80 0.00 6,847.28 0.00 7.10 0.00 6,847.28 0.00 7.40 0.00 6,847.28 0.00 7.70 0.00 6,847.28 0.00 8.00 0.00 6,847.28 0.00 8.30 0.00 6,847.28 0.00 8.60 0.00 6,847.28 0.00 8.90 0.00 6,847.28 0.00 9.20 0.00 6,847.30 0.00 9.50 0.01 6,847.32 0.01 9.80 0.02 6,847.33 0.02 10.10 0.03 6,847.35 0.03 10.40 0.04 6,847.37 0.04 10.70 0.06 6,847.39 0.06 11.00 0.09 6,847.41 0.09 11.30 0.14 6,847.44 0.14 11.60 0.25 6,847.50 0.25 11.90 2.22 6,847.97 2.22 12.20 2.74 6,848.05 2.74 12.50 0.85 6,847.69 0.85 12.80 0.51 6,847.59 0.51 13.10 0.41 6,847.56 0.41 13.40 0.35 6,847.54 0.35 13.70 0.30 6,847.52 0.30 14.00 0.26 6,847.50 0.26 14.30 0.23 6,847.49 0.23 14.60 0.22 6,847.48 0.22 14.90 0.21 6,847.48 0.21 15.20 0.20 6,847.47 0.20 15.50 0.18 6,847.46 0.18 15.80 0.17 6,847.46 0.17 16.10 0.16 6,847.45 0.16 16.40 0.15 6,847.45 0.15 16.70 0.14 6,847.44 0.14 17.00 0.14 6,847.44 0.14 17.30 0.14 6,847.44 0.14 17.60 0.13 6,847.44 0.13 17.90 0.13 6,847.43 0.13 18.20 0.12 6,847.43 0.12 18.50 0.12 6,847.43 0.12 18.80 0.11 6,847.42 0.11 19.10 0.11 6,847.42 0.11 19.40 0.10 6,847.42 0.10 19.70 0.10 6,847.41 0.10 20.00 0.09 6,847.41 0.09 20.30 0.09 6,847.41 0.09 20.60 0.09 6,847.41 0.09 Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 20.90 0.09 6,847.41 0.09 21.20 0.09 6,847.41 0.09 21.50 0.09 6,847.41 0.09 21.80 0.08 6,847.40 0.08 22.10 0.08 6,847.40 0.08 22.40 0.08 6,847.40 0.08 22.70 0.08 6,847.40 0.08 23.00 0.08 6,847.40 0.08 23.30 0.08 6,847.40 0.08 23.60 0.08 6,847.40 0.08 23.90 0.08 6,847.40 0.08 24.20 0.04 6,847.36 0.04 24.50 0.00 6,847.30 0.00 24.80 0.00 6,847.28 0.00 25.10 0.00 6,847.28 0.00 25.40 0.00 6,847.28 0.00 25.70 0.00 6,847.28 0.00 26.00 0.00 6,847.28 0.00 26.30 0.00 6,847.28 0.00 26.60 0.00 6,847.28 0.00 26.90 0.00 6,847.28 0.00 27.20 0.00 6,847.28 0.00 27.50 0.00 6,847.28 0.00 27.80 0.00 6,847.28 0.00 28.10 0.00 6,847.28 0.00 28.40 0.00 6,847.28 0.00 28.70 0.00 6,847.28 0.00 29.00 0.00 6,847.28 0.00 29.30 0.00 6,847.28 0.00 29.60 0.00 6,847.28 0.00 29.90 0.00 6,847.28 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 104HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Pond 55P: POST-CULVERT-01B-1 Elevation (feet) Primary (cfs) 6,847.28 0.00 6,847.29 0.00 6,847.30 0.00 6,847.31 0.00 6,847.32 0.01 6,847.33 0.01 6,847.34 0.02 6,847.35 0.03 6,847.36 0.04 6,847.37 0.04 6,847.38 0.05 6,847.39 0.07 6,847.40 0.08 6,847.41 0.09 6,847.42 0.11 6,847.43 0.12 6,847.44 0.14 6,847.45 0.16 6,847.46 0.17 6,847.47 0.19 6,847.48 0.21 6,847.49 0.23 6,847.50 0.26 6,847.51 0.28 6,847.52 0.30 6,847.53 0.33 6,847.54 0.36 6,847.55 0.38 6,847.56 0.41 6,847.57 0.44 6,847.58 0.47 6,847.59 0.50 6,847.60 0.53 6,847.61 0.56 6,847.62 0.60 6,847.63 0.63 6,847.64 0.67 6,847.65 0.70 6,847.66 0.74 6,847.67 0.78 6,847.68 0.81 6,847.69 0.85 6,847.70 0.89 6,847.71 0.93 6,847.72 0.98 6,847.73 1.02 6,847.74 1.06 6,847.75 1.11 6,847.76 1.15 6,847.77 1.20 6,847.78 1.24 6,847.79 1.29 6,847.80 1.34 Elevation (feet) Primary (cfs) 6,847.81 1.38 6,847.82 1.43 6,847.83 1.48 6,847.84 1.53 6,847.85 1.58 6,847.86 1.64 6,847.87 1.69 6,847.88 1.74 6,847.89 1.79 6,847.90 1.85 6,847.91 1.90 6,847.92 1.96 6,847.93 2.01 6,847.94 2.07 6,847.95 2.13 6,847.96 2.19 6,847.97 2.24 6,847.98 2.30 6,847.99 2.36 6,848.00 2.42 6,848.01 2.48 6,848.02 2.54 6,848.03 2.61 6,848.04 2.67 6,848.05 2.73 6,848.06 2.79 6,848.07 2.86 6,848.08 2.92 6,848.09 2.98 6,848.10 3.05 6,848.11 3.11 6,848.12 3.18 6,848.13 3.24 6,848.14 3.31 6,848.15 3.38 6,848.16 3.44 6,848.17 3.51 6,848.18 3.58 6,848.19 3.64 6,848.20 3.71 6,848.21 3.78 6,848.22 3.85 6,848.23 3.92 6,848.24 3.98 6,848.25 4.05 6,848.26 4.12 6,848.27 4.19 6,848.28 4.26 6,848.29 4.33 6,848.30 4.40 6,848.31 4.47 6,848.32 4.54 6,848.33 4.61 Elevation (feet) Primary (cfs) 6,848.34 4.68 6,848.35 4.75 6,848.36 4.82 6,848.37 4.89 6,848.38 4.96 6,848.39 5.03 6,848.40 5.10 6,848.41 5.17 6,848.42 5.24 6,848.43 5.31 6,848.44 5.38 6,848.45 5.45 6,848.46 5.52 6,848.47 5.58 6,848.48 5.65 6,848.49 5.72 6,848.50 5.79 6,848.51 5.86 6,848.52 5.92 6,848.53 5.99 6,848.54 6.06 6,848.55 6.12 6,848.56 6.19 6,848.57 6.25 6,848.58 6.32 6,848.59 6.38 6,848.60 6.44 6,848.61 6.50 6,848.62 6.57 6,848.63 6.63 6,848.64 6.69 6,848.65 6.75 6,848.66 6.80 6,848.67 6.86 6,848.68 6.92 6,848.69 6.97 6,848.70 7.02 6,848.71 7.07 6,848.72 7.12 6,848.73 7.17 6,848.74 7.22 6,848.75 7.26 6,848.76 7.30 6,848.77 7.34 6,848.78 7.37 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 105HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 55P: POST-CULVERT-01B-1 Elevation (feet) Storage (acre-feet) 6,847.28 0.000 6,847.29 0.000 6,847.30 0.000 6,847.31 0.000 6,847.32 0.000 6,847.33 0.000 6,847.34 0.000 6,847.35 0.000 6,847.36 0.000 6,847.37 0.000 6,847.38 0.000 6,847.39 0.000 6,847.40 0.000 6,847.41 0.000 6,847.42 0.000 6,847.43 0.000 6,847.44 0.000 6,847.45 0.000 6,847.46 0.000 6,847.47 0.000 6,847.48 0.000 6,847.49 0.000 6,847.50 0.000 6,847.51 0.000 6,847.52 0.000 6,847.53 0.000 6,847.54 0.000 6,847.55 0.000 6,847.56 0.000 6,847.57 0.000 6,847.58 0.000 6,847.59 0.000 6,847.60 0.000 6,847.61 0.000 6,847.62 0.000 6,847.63 0.000 6,847.64 0.000 6,847.65 0.000 6,847.66 0.000 6,847.67 0.000 6,847.68 0.000 6,847.69 0.000 6,847.70 0.000 6,847.71 0.000 6,847.72 0.000 6,847.73 0.000 6,847.74 0.000 6,847.75 0.000 6,847.76 0.000 6,847.77 0.000 6,847.78 0.000 6,847.79 0.000 6,847.80 0.000 Elevation (feet) Storage (acre-feet) 6,847.81 0.000 6,847.82 0.000 6,847.83 0.000 6,847.84 0.000 6,847.85 0.000 6,847.86 0.000 6,847.87 0.000 6,847.88 0.000 6,847.89 0.000 6,847.90 0.000 6,847.91 0.000 6,847.92 0.000 6,847.93 0.000 6,847.94 0.000 6,847.95 0.000 6,847.96 0.000 6,847.97 0.000 6,847.98 0.000 6,847.99 0.000 6,848.00 0.000 6,848.01 0.000 6,848.02 0.000 6,848.03 0.000 6,848.04 0.000 6,848.05 0.000 6,848.06 0.000 6,848.07 0.000 6,848.08 0.000 6,848.09 0.000 6,848.10 0.000 6,848.11 0.000 6,848.12 0.000 6,848.13 0.000 6,848.14 0.000 6,848.15 0.000 6,848.16 0.000 6,848.17 0.000 6,848.18 0.000 6,848.19 0.000 6,848.20 0.000 6,848.21 0.000 6,848.22 0.000 6,848.23 0.000 6,848.24 0.000 6,848.25 0.000 6,848.26 0.000 6,848.27 0.000 6,848.28 0.000 6,848.29 0.000 6,848.30 0.000 6,848.31 0.000 6,848.32 0.000 6,848.33 0.000 Elevation (feet) Storage (acre-feet) 6,848.34 0.000 6,848.35 0.000 6,848.36 0.000 6,848.37 0.000 6,848.38 0.000 6,848.39 0.000 6,848.40 0.000 6,848.41 0.000 6,848.42 0.000 6,848.43 0.000 6,848.44 0.000 6,848.45 0.000 6,848.46 0.000 6,848.47 0.000 6,848.48 0.000 6,848.49 0.000 6,848.50 0.000 6,848.51 0.000 6,848.52 0.000 6,848.53 0.000 6,848.54 0.000 6,848.55 0.000 6,848.56 0.000 6,848.57 0.000 6,848.58 0.000 6,848.59 0.000 6,848.60 0.000 6,848.61 0.000 6,848.62 0.000 6,848.63 0.000 6,848.64 0.000 6,848.65 0.000 6,848.66 0.000 6,848.67 0.000 6,848.68 0.000 6,848.69 0.000 6,848.70 0.000 6,848.71 0.000 6,848.72 0.000 6,848.73 0.000 6,848.74 0.000 6,848.75 0.000 6,848.76 0.000 6,848.77 0.000 6,848.78 0.000 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 106HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Pond 58R: POST-CULVERT-01B-4 [57] Hint: Peaked at 6,823.36' (Flood elevation advised) [62] Hint: Exceeded Reach 57R OUTLET depth by 1.17' @ 12.08 hrs Inflow Area = 8.507 ac, 30.05% Impervious, Inflow Depth = 1.21" for 100-YR event Inflow = 12.63 cfs @ 12.07 hrs, Volume= 0.860 af Outflow = 12.63 cfs @ 12.07 hrs, Volume= 0.860 af, Atten= 0%, Lag= 0.0 min Primary = 12.63 cfs @ 12.07 hrs, Volume= 0.860 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Peak Elev= 6,823.36' @ 12.07 hrs Device Routing Invert Outlet Devices #1 Primary 6,821.66'24.0" Round Culvert L= 42.5' Ke= 0.500 Inlet / Outlet Invert= 6,821.66' / 6,820.46' S= 0.0282 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 3.14 sf Primary OutFlow Max=12.57 cfs @ 12.07 hrs HW=6,823.35' TW=6,820.66' (Dynamic Tailwater) 1=Culvert (Inlet Controls 12.57 cfs @ 4.43 fps) Pond 58R: POST-CULVERT-01B-4 Inflow Primary Hydrograph Time (hours) 2826242220181614121086Flow (cfs)14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=8.507 ac Peak Elev=6,823.36' 24.0" Round Culvert n=0.012 L=42.5' S=0.0282 '/' 12.63 cfs12.63 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 107HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Pond 58R: POST-CULVERT-01B-4 Primary Stage-Discharge Discharge (cfs) 1514131211109876543210Elevation (feet)6,823 6,822 Culvert Pond 58R: POST-CULVERT-01B-4 Storage Stage-Area-Storage Storage (acre-feet) 0Elevation (feet)6,823 6,822 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 108HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Pond 58R: POST-CULVERT-01B-4 Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 5.00 0.00 6,821.66 0.00 5.30 0.00 6,821.66 0.00 5.60 0.00 6,821.66 0.00 5.90 0.00 6,821.66 0.00 6.20 0.00 6,821.66 0.00 6.50 0.00 6,821.66 0.00 6.80 0.00 6,821.66 0.00 7.10 0.00 6,821.66 0.00 7.40 0.00 6,821.66 0.00 7.70 0.00 6,821.66 0.00 8.00 0.00 6,821.67 0.00 8.30 0.00 6,821.68 0.00 8.60 0.01 6,821.69 0.01 8.90 0.01 6,821.70 0.01 9.20 0.02 6,821.72 0.02 9.50 0.04 6,821.74 0.04 9.80 0.06 6,821.76 0.06 10.10 0.08 6,821.78 0.08 10.40 0.12 6,821.80 0.12 10.70 0.18 6,821.83 0.18 11.00 0.26 6,821.86 0.26 11.30 0.40 6,821.91 0.40 11.60 0.67 6,821.99 0.67 11.90 5.11 6,822.63 5.11 12.20 8.25 6,822.95 8.25 12.50 2.57 6,822.33 2.57 12.80 1.43 6,822.15 1.43 13.10 1.10 6,822.09 1.10 13.40 0.92 6,822.05 0.92 13.70 0.79 6,822.02 0.79 14.00 0.69 6,822.00 0.69 14.30 0.61 6,821.98 0.61 14.60 0.58 6,821.97 0.58 14.90 0.54 6,821.96 0.54 15.20 0.51 6,821.95 0.51 15.50 0.48 6,821.94 0.48 15.80 0.44 6,821.93 0.44 16.10 0.41 6,821.92 0.41 16.40 0.39 6,821.91 0.39 16.70 0.38 6,821.91 0.38 17.00 0.36 6,821.90 0.36 17.30 0.35 6,821.90 0.35 17.60 0.34 6,821.89 0.34 17.90 0.33 6,821.89 0.33 18.20 0.32 6,821.89 0.32 18.50 0.30 6,821.88 0.30 18.80 0.29 6,821.88 0.29 19.10 0.28 6,821.87 0.28 19.40 0.27 6,821.87 0.27 19.70 0.25 6,821.86 0.25 20.00 0.24 6,821.86 0.24 20.30 0.23 6,821.85 0.23 20.60 0.23 6,821.85 0.23 Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 20.90 0.22 6,821.85 0.22 21.20 0.22 6,821.85 0.22 21.50 0.22 6,821.85 0.22 21.80 0.22 6,821.85 0.22 22.10 0.22 6,821.85 0.22 22.40 0.21 6,821.84 0.21 22.70 0.21 6,821.84 0.21 23.00 0.21 6,821.84 0.21 23.30 0.21 6,821.84 0.21 23.60 0.20 6,821.84 0.20 23.90 0.20 6,821.84 0.20 24.20 0.12 6,821.80 0.12 24.50 0.01 6,821.70 0.01 24.80 0.00 6,821.67 0.00 25.10 0.00 6,821.67 0.00 25.40 0.00 6,821.66 0.00 25.70 0.00 6,821.66 0.00 26.00 0.00 6,821.66 0.00 26.30 0.00 6,821.66 0.00 26.60 0.00 6,821.66 0.00 26.90 0.00 6,821.66 0.00 27.20 0.00 6,821.66 0.00 27.50 0.00 6,821.66 0.00 27.80 0.00 6,821.66 0.00 28.10 0.00 6,821.66 0.00 28.40 0.00 6,821.66 0.00 28.70 0.00 6,821.66 0.00 29.00 0.00 6,821.66 0.00 29.30 0.00 6,821.66 0.00 29.60 0.00 6,821.66 0.00 29.90 0.00 6,821.66 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 109HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Pond 58R: POST-CULVERT-01B-4 Elevation (feet) Primary (cfs) 6,821.66 0.00 6,821.67 0.00 6,821.68 0.00 6,821.69 0.01 6,821.70 0.01 6,821.71 0.02 6,821.72 0.02 6,821.73 0.03 6,821.74 0.04 6,821.75 0.05 6,821.76 0.06 6,821.77 0.08 6,821.78 0.09 6,821.79 0.11 6,821.80 0.12 6,821.81 0.14 6,821.82 0.16 6,821.83 0.18 6,821.84 0.20 6,821.85 0.23 6,821.86 0.25 6,821.87 0.27 6,821.88 0.30 6,821.89 0.33 6,821.90 0.36 6,821.91 0.39 6,821.92 0.42 6,821.93 0.45 6,821.94 0.48 6,821.95 0.52 6,821.96 0.55 6,821.97 0.59 6,821.98 0.62 6,821.99 0.66 6,822.00 0.70 6,822.01 0.74 6,822.02 0.79 6,822.03 0.83 6,822.04 0.87 6,822.05 0.92 6,822.06 0.96 6,822.07 1.01 6,822.08 1.06 6,822.09 1.11 6,822.10 1.16 6,822.11 1.21 6,822.12 1.26 6,822.13 1.31 6,822.14 1.37 6,822.15 1.42 6,822.16 1.48 6,822.17 1.54 6,822.18 1.59 Elevation (feet) Primary (cfs) 6,822.19 1.65 6,822.20 1.71 6,822.21 1.77 6,822.22 1.83 6,822.23 1.90 6,822.24 1.96 6,822.25 2.03 6,822.26 2.09 6,822.27 2.16 6,822.28 2.22 6,822.29 2.29 6,822.30 2.36 6,822.31 2.43 6,822.32 2.50 6,822.33 2.57 6,822.34 2.64 6,822.35 2.72 6,822.36 2.79 6,822.37 2.87 6,822.38 2.94 6,822.39 3.02 6,822.40 3.09 6,822.41 3.17 6,822.42 3.25 6,822.43 3.33 6,822.44 3.41 6,822.45 3.49 6,822.46 3.57 6,822.47 3.66 6,822.48 3.74 6,822.49 3.82 6,822.50 3.91 6,822.51 3.99 6,822.52 4.08 6,822.53 4.17 6,822.54 4.25 6,822.55 4.34 6,822.56 4.43 6,822.57 4.52 6,822.58 4.61 6,822.59 4.70 6,822.60 4.79 6,822.61 4.88 6,822.62 4.97 6,822.63 5.07 6,822.64 5.16 6,822.65 5.25 6,822.66 5.35 6,822.67 5.44 6,822.68 5.54 6,822.69 5.64 6,822.70 5.73 6,822.71 5.83 Elevation (feet) Primary (cfs) 6,822.72 5.93 6,822.73 6.02 6,822.74 6.12 6,822.75 6.22 6,822.76 6.32 6,822.77 6.42 6,822.78 6.52 6,822.79 6.62 6,822.80 6.72 6,822.81 6.83 6,822.82 6.93 6,822.83 7.03 6,822.84 7.13 6,822.85 7.24 6,822.86 7.34 6,822.87 7.44 6,822.88 7.55 6,822.89 7.65 6,822.90 7.76 6,822.91 7.86 6,822.92 7.97 6,822.93 8.07 6,822.94 8.18 6,822.95 8.29 6,822.96 8.39 6,822.97 8.50 6,822.98 8.60 6,822.99 8.71 6,823.00 8.82 6,823.01 8.93 6,823.02 9.03 6,823.03 9.14 6,823.04 9.25 6,823.05 9.36 6,823.06 9.46 6,823.07 9.57 6,823.08 9.68 6,823.09 9.79 6,823.10 9.89 6,823.11 10.00 6,823.12 10.11 6,823.13 10.22 6,823.14 10.32 6,823.15 10.43 6,823.16 10.54 6,823.17 10.65 6,823.18 10.75 6,823.19 10.86 6,823.20 10.97 6,823.21 11.07 6,823.22 11.18 6,823.23 11.29 6,823.24 11.39 Elevation (feet) Primary (cfs) 6,823.25 11.50 6,823.26 11.60 6,823.27 11.71 6,823.28 11.81 6,823.29 11.92 6,823.30 12.02 6,823.31 12.12 6,823.32 12.23 6,823.33 12.33 6,823.34 12.43 6,823.35 12.53 6,823.36 12.63 6,823.37 12.73 6,823.38 12.83 6,823.39 12.93 6,823.40 13.03 6,823.41 13.13 6,823.42 13.23 6,823.43 13.32 6,823.44 13.42 6,823.45 13.51 6,823.46 13.60 6,823.47 13.70 6,823.48 13.79 6,823.49 13.88 6,823.50 13.97 6,823.51 14.05 6,823.52 14.14 6,823.53 14.22 6,823.54 14.31 6,823.55 14.39 6,823.56 14.47 6,823.57 14.55 6,823.58 14.62 6,823.59 14.70 6,823.60 14.77 6,823.61 14.84 6,823.62 14.90 6,823.63 14.97 6,823.64 15.03 6,823.65 15.08 6,823.66 15.13 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 110HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 58R: POST-CULVERT-01B-4 Elevation (feet) Storage (acre-feet) 6,821.66 0.000 6,821.68 0.000 6,821.70 0.000 6,821.72 0.000 6,821.74 0.000 6,821.76 0.000 6,821.78 0.000 6,821.80 0.000 6,821.82 0.000 6,821.84 0.000 6,821.86 0.000 6,821.88 0.000 6,821.90 0.000 6,821.92 0.000 6,821.94 0.000 6,821.96 0.000 6,821.98 0.000 6,822.00 0.000 6,822.02 0.000 6,822.04 0.000 6,822.06 0.000 6,822.08 0.000 6,822.10 0.000 6,822.12 0.000 6,822.14 0.000 6,822.16 0.000 6,822.18 0.000 6,822.20 0.000 6,822.22 0.000 6,822.24 0.000 6,822.26 0.000 6,822.28 0.000 6,822.30 0.000 6,822.32 0.000 6,822.34 0.000 6,822.36 0.000 6,822.38 0.000 6,822.40 0.000 6,822.42 0.000 6,822.44 0.000 6,822.46 0.000 6,822.48 0.000 6,822.50 0.000 6,822.52 0.000 6,822.54 0.000 6,822.56 0.000 6,822.58 0.000 6,822.60 0.000 6,822.62 0.000 6,822.64 0.000 6,822.66 0.000 6,822.68 0.000 6,822.70 0.000 Elevation (feet) Storage (acre-feet) 6,822.72 0.000 6,822.74 0.000 6,822.76 0.000 6,822.78 0.000 6,822.80 0.000 6,822.82 0.000 6,822.84 0.000 6,822.86 0.000 6,822.88 0.000 6,822.90 0.000 6,822.92 0.000 6,822.94 0.000 6,822.96 0.000 6,822.98 0.000 6,823.00 0.000 6,823.02 0.000 6,823.04 0.000 6,823.06 0.000 6,823.08 0.000 6,823.10 0.000 6,823.12 0.000 6,823.14 0.000 6,823.16 0.000 6,823.18 0.000 6,823.20 0.000 6,823.22 0.000 6,823.24 0.000 6,823.26 0.000 6,823.28 0.000 6,823.30 0.000 6,823.32 0.000 6,823.34 0.000 6,823.36 0.000 6,823.38 0.000 6,823.40 0.000 6,823.42 0.000 6,823.44 0.000 6,823.46 0.000 6,823.48 0.000 6,823.50 0.000 6,823.52 0.000 6,823.54 0.000 6,823.56 0.000 6,823.58 0.000 6,823.60 0.000 6,823.62 0.000 6,823.64 0.000 6,823.66 0.000 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 111HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Pond 59P: Detention Basin Inflow Area = 9.433 ac, 27.85% Impervious, Inflow Depth = 1.15" for 100-YR event Inflow = 12.73 cfs @ 12.08 hrs, Volume= 0.905 af Outflow = 2.23 cfs @ 12.62 hrs, Volume= 0.889 af, Atten= 83%, Lag= 32.3 min Primary = 2.23 cfs @ 12.62 hrs, Volume= 0.889 af Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Peak Elev= 6,807.13' @ 12.62 hrs Surf.Area= 5,505 sf Storage= 15,138 cf Plug-Flow detention time= 83.3 min calculated for 0.889 af (98% of inflow) Center-of-Mass det. time= 72.9 min ( 922.1 - 849.1 ) Volume Invert Avail.Storage Storage Description #1 6,802.25' 30,863 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 6,802.25 2 0 0 6,802.50 939 118 118 6,802.75 1,956 362 480 6,803.00 2,090 506 985 6,803.25 2,228 540 1,525 6,803.50 2,370 575 2,100 6,803.75 2,515 611 2,710 6,804.00 2,664 647 3,358 6,804.25 2,817 685 4,043 6,804.50 2,973 724 4,767 6,804.75 3,134 763 5,530 6,805.00 3,298 804 6,334 6,805.25 3,466 846 7,180 6,805.50 3,638 888 8,068 6,805.75 3,814 932 8,999 6,806.00 3,993 976 9,975 6,806.25 4,193 1,023 10,998 6,806.50 4,434 1,078 12,077 6,806.75 4,717 1,144 13,220 6,807.00 5,111 1,229 14,449 6,807.25 5,870 1,373 15,822 6,807.50 6,508 1,547 17,369 6,807.75 7,087 1,699 19,068 6,808.00 8,022 1,889 20,957 6,808.25 9,070 2,137 23,093 6,808.50 10,045 2,389 25,483 6,808.75 10,818 2,608 28,091 6,809.00 11,362 2,773 30,863 Device Routing Invert Outlet Devices #1 Primary 6,802.83'6.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Secondary 6,807.46'12.0" Round Culvert L= 14.6' CPP, projecting, no headwall, Ke= 0.900 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 112HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Inlet / Outlet Invert= 6,807.46' / 6,807.09' S= 0.0253 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 0.79 sf Primary OutFlow Max=2.23 cfs @ 12.62 hrs HW=6,807.13' (Free Discharge) 1=Orifice/Grate (Orifice Controls 2.23 cfs @ 9.66 fps) Secondary OutFlow Max=0.00 cfs @ 5.00 hrs HW=6,802.25' (Free Discharge) 2=Culvert ( Controls 0.00 cfs) Pond 59P: Detention Basin Inflow Outflow Primary Secondary Hydrograph Time (hours) 2826242220181614121086Flow (cfs)14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=9.433 ac Peak Elev=6,807.13' Storage=15,138 cf 12.73 cfs 2.23 cfs2.23 cfs 0.00 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 113HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Pond 59P: Detention Basin Total Primary Secondary Stage-Discharge Discharge (cfs) 543210Elevation (feet)6,809 6,808 6,807 6,806 6,805 6,804 6,803 Orifice/Grate Culvert Pond 59P: Detention Basin Surface Storage Stage-Area-Storage Storage (cubic-feet) 30,00028,00026,00024,00022,00020,00018,00016,00014,00012,00010,0008,0006,0004,0002,0000 Surface/Horizontal/Wetted Area (sq-ft) 11,00010,0009,0008,0007,0006,0005,0004,0003,0002,0001,0000 Elevation (feet)6,809 6,808 6,807 6,806 6,805 6,804 6,803 Custom Stage Data Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 114HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Pond 59P: Detention Basin Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) Primary (cfs) Secondary (cfs) 5.00 0.00 0 6,802.25 0.00 0.00 0.00 5.60 0.00 0 6,802.25 0.00 0.00 0.00 6.20 0.00 0 6,802.25 0.00 0.00 0.00 6.80 0.00 0 6,802.25 0.00 0.00 0.00 7.40 0.00 0 6,802.25 0.00 0.00 0.00 8.00 0.00 0 6,802.27 0.00 0.00 0.00 8.60 0.00 6 6,802.30 0.00 0.00 0.00 9.20 0.02 31 6,802.38 0.00 0.00 0.00 9.80 0.06 115 6,802.50 0.00 0.00 0.00 10.40 0.12 299 6,802.65 0.00 0.00 0.00 11.00 0.26 689 6,802.86 0.00 0.00 0.00 11.60 0.66 1,342 6,803.17 0.30 0.30 0.00 12.20 8.56 12,090 6,806.50 2.05 2.05 0.00 12.80 1.62 14,906 6,807.09 2.22 2.22 0.00 13.40 1.00 12,923 6,806.69 2.10 2.10 0.00 14.00 0.74 10,429 6,806.11 1.93 1.93 0.00 14.60 0.62 7,941 6,805.47 1.71 1.71 0.00 15.20 0.55 5,775 6,804.83 1.46 1.46 0.00 15.80 0.48 4,022 6,804.24 1.19 1.19 0.00 16.40 0.42 2,726 6,803.76 0.90 0.90 0.00 17.00 0.39 1,944 6,803.43 0.64 0.64 0.00 17.60 0.36 1,581 6,803.28 0.46 0.46 0.00 18.20 0.34 1,453 6,803.22 0.37 0.37 0.00 18.80 0.31 1,394 6,803.19 0.33 0.33 0.00 19.40 0.29 1,351 6,803.17 0.30 0.30 0.00 20.00 0.26 1,311 6,803.15 0.28 0.28 0.00 20.60 0.24 1,276 6,803.14 0.25 0.25 0.00 21.20 0.24 1,260 6,803.13 0.24 0.24 0.00 21.80 0.23 1,250 6,803.12 0.24 0.24 0.00 22.40 0.23 1,242 6,803.12 0.23 0.23 0.00 23.00 0.22 1,234 6,803.12 0.23 0.23 0.00 23.60 0.22 1,226 6,803.11 0.22 0.22 0.00 24.20 0.14 1,205 6,803.10 0.21 0.21 0.00 24.80 0.00 980 6,803.00 0.08 0.08 0.00 25.40 0.00 860 6,802.94 0.04 0.04 0.00 26.00 0.00 800 6,802.91 0.02 0.02 0.00 26.60 0.00 765 6,802.89 0.01 0.01 0.00 27.20 0.00 742 6,802.88 0.01 0.01 0.00 27.80 0.00 726 6,802.87 0.01 0.01 0.00 28.40 0.00 714 6,802.87 0.00 0.00 0.00 29.00 0.00 705 6,802.86 0.00 0.00 0.00 29.60 0.00 698 6,802.86 0.00 0.00 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 115HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Pond 59P: Detention Basin Elevation (feet) Discharge (cfs) Primary (cfs) Secondary (cfs) 6,802.25 0.00 0.00 0.00 6,802.35 0.00 0.00 0.00 6,802.45 0.00 0.00 0.00 6,802.55 0.00 0.00 0.00 6,802.65 0.00 0.00 0.00 6,802.75 0.00 0.00 0.00 6,802.85 0.00 0.00 0.00 6,802.95 0.04 0.04 0.00 6,803.05 0.14 0.14 0.00 6,803.15 0.27 0.27 0.00 6,803.25 0.42 0.42 0.00 6,803.35 0.56 0.56 0.00 6,803.45 0.66 0.66 0.00 6,803.55 0.74 0.74 0.00 6,803.65 0.82 0.82 0.00 6,803.75 0.89 0.89 0.00 6,803.85 0.96 0.96 0.00 6,803.95 1.02 1.02 0.00 6,804.05 1.08 1.08 0.00 6,804.15 1.14 1.14 0.00 6,804.25 1.19 1.19 0.00 6,804.35 1.24 1.24 0.00 6,804.45 1.29 1.29 0.00 6,804.55 1.34 1.34 0.00 6,804.65 1.38 1.38 0.00 6,804.75 1.42 1.42 0.00 6,804.85 1.47 1.47 0.00 6,804.95 1.51 1.51 0.00 6,805.05 1.55 1.55 0.00 6,805.15 1.59 1.59 0.00 6,805.25 1.63 1.63 0.00 6,805.35 1.66 1.66 0.00 6,805.45 1.70 1.70 0.00 6,805.55 1.74 1.74 0.00 6,805.65 1.77 1.77 0.00 6,805.75 1.81 1.81 0.00 6,805.85 1.84 1.84 0.00 6,805.95 1.87 1.87 0.00 6,806.05 1.91 1.91 0.00 6,806.15 1.94 1.94 0.00 6,806.25 1.97 1.97 0.00 6,806.35 2.00 2.00 0.00 6,806.45 2.03 2.03 0.00 6,806.55 2.06 2.06 0.00 6,806.65 2.09 2.09 0.00 6,806.75 2.12 2.12 0.00 6,806.85 2.15 2.15 0.00 6,806.95 2.18 2.18 0.00 6,807.05 2.20 2.20 0.00 6,807.15 2.23 2.23 0.00 6,807.25 2.26 2.26 0.00 6,807.35 2.29 2.29 0.00 6,807.45 2.31 2.31 0.00 Elevation (feet) Discharge (cfs) Primary (cfs) Secondary (cfs) 6,807.55 2.37 2.34 0.03 6,807.65 2.49 2.37 0.12 6,807.75 2.67 2.39 0.27 6,807.85 2.89 2.42 0.48 6,807.95 3.16 2.44 0.72 6,808.05 3.46 2.47 1.00 6,808.15 3.78 2.49 1.29 6,808.25 4.11 2.52 1.59 6,808.35 4.41 2.54 1.87 6,808.45 4.66 2.57 2.10 6,808.55 4.88 2.59 2.29 6,808.65 5.09 2.61 2.48 6,808.75 5.29 2.64 2.65 6,808.85 5.48 2.66 2.82 6,808.95 5.65 2.68 2.97 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 116HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 59P: Detention Basin Elevation (feet) Surface (sq-ft) Storage (cubic-feet) 6,802.25 2 0 6,802.35 377 19 6,802.45 752 75 6,802.55 1,142 170 6,802.65 1,549 304 6,802.75 1,956 480 6,802.85 2,010 678 6,802.95 2,063 881 6,803.05 2,118 1,090 6,803.15 2,173 1,305 6,803.25 2,228 1,525 6,803.35 2,285 1,751 6,803.45 2,342 1,982 6,803.55 2,399 2,219 6,803.65 2,457 2,462 6,803.75 2,515 2,710 6,803.85 2,575 2,965 6,803.95 2,634 3,225 6,804.05 2,695 3,492 6,804.15 2,756 3,764 6,804.25 2,817 4,043 6,804.35 2,879 4,328 6,804.45 2,942 4,619 6,804.55 3,005 4,916 6,804.65 3,070 5,220 6,804.75 3,134 5,530 6,804.85 3,200 5,847 6,804.95 3,265 6,170 6,805.05 3,332 6,500 6,805.15 3,399 6,836 6,805.25 3,466 7,180 6,805.35 3,535 7,530 6,805.45 3,604 7,886 6,805.55 3,673 8,250 6,805.65 3,744 8,621 6,805.75 3,814 8,999 6,805.85 3,886 9,384 6,805.95 3,957 9,776 6,806.05 4,033 10,176 6,806.15 4,113 10,583 6,806.25 4,193 10,998 6,806.35 4,289 11,422 6,806.45 4,386 11,856 6,806.55 4,491 12,300 6,806.65 4,604 12,754 6,806.75 4,717 13,220 6,806.85 4,875 13,700 6,806.95 5,032 14,195 6,807.05 5,263 14,708 6,807.15 5,566 15,250 6,807.25 5,870 15,822 6,807.35 6,125 16,421 6,807.45 6,380 17,047 Elevation (feet) Surface (sq-ft) Storage (cubic-feet) 6,807.55 6,624 17,697 6,807.65 6,855 18,371 6,807.75 7,087 19,068 6,807.85 7,461 19,796 6,807.95 7,835 20,560 6,808.05 8,232 21,363 6,808.15 8,651 22,207 6,808.25 9,070 23,093 6,808.35 9,460 24,020 6,808.45 9,850 24,985 6,808.55 10,200 25,989 6,808.65 10,509 27,024 6,808.75 10,818 28,091 6,808.85 11,036 29,183 6,808.95 11,253 30,298 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 117HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment 51S: POST-AREA-01A Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 25-YR 2.21 1.76 0.137 0.78 100-YR 2.81 2.77 0.213 1.20 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 118HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment 53S: POST-AREA-01B Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 25-YR 2.21 3.28 0.209 0.73 100-YR 2.81 5.21 0.326 1.15 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 119HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment 54S: POST-AREA-01C Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 25-YR 2.21 1.26 0.079 0.92 100-YR 2.81 1.91 0.119 1.38 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 120HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment 56S: PRE-AREA-01D Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 25-YR 2.21 2.04 0.133 0.82 100-YR 2.81 3.16 0.203 1.26 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 121HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment 62S: POST-AREA-01E Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 25-YR 2.21 0.15 0.024 0.31 100-YR 2.81 0.32 0.045 0.58 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 122HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 56R: POST-CULVERT-01B-2 Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 3.28 3.28 6,846.71 38 100-YR 5.21 5.21 6,846.79 53 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 123HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 57R: POST-CULVERT-01B-3 Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 4.54 4.54 6,834.61 31 100-YR 7.12 7.12 6,834.70 43 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 124HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 59R: POST-REACH-01B Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 1.76 1.75 6,837.96 135 100-YR 2.77 2.76 6,838.04 191 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 125HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 61R: POST-REACH-01B-4 Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 8.05 8.05 6,820.62 95 100-YR 12.63 12.63 6,820.66 133 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 126HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Pond 52P: POST-CULVERT-01A Event Inflow (cfs) Primary (cfs) Elevation (feet) Storage (acre-feet) 25-YR 1.76 1.76 6,839.73 0.000 100-YR 2.77 2.77 6,840.05 0.000 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 127HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Pond 55P: POST-CULVERT-01B-1 Event Inflow (cfs) Primary (cfs) Elevation (feet) Storage (acre-feet) 25-YR 3.28 3.28 6,848.14 0.000 100-YR 5.21 5.21 6,848.42 0.000 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 128HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Pond 58R: POST-CULVERT-01B-4 Event Inflow (cfs) Primary (cfs) Elevation (feet) Storage (acre-feet) 25-YR 8.05 8.05 6,822.93 0.000 100-YR 12.63 12.63 6,823.36 0.000 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 129HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Pond 59P: Detention Basin Event Inflow (cfs) Outflow (cfs) Primary (cfs) Secondary (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 8.09 1.78 1.78 0.00 6,805.68 8,743 100-YR 12.73 2.23 2.23 0.00 6,807.13 15,138 Table of Contents03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC TABLE OF CONTENTS Project Reports 1 Routing Diagram 2 Rainfall Events Listing (selected events) 3 Area Listing (selected nodes) 4 Soil Listing (selected nodes) 5 Ground Covers (selected nodes) 6 Pipe Listing (selected nodes) 25-YR Event 7 Node Listing 8 Subcat 51S: POST-AREA-01A 10 Subcat 53S: POST-AREA-01B 13 Subcat 54S: POST-AREA-01C 16 Subcat 56S: PRE-AREA-01D 18 Subcat 62S: POST-AREA-01E 20 Reach 56R: POST-CULVERT-01B-2 25 Reach 57R: POST-CULVERT-01B-3 31 Reach 59R: POST-REACH-01B 36 Reach 61R: POST-REACH-01B-4 41 Pond 52P: POST-CULVERT-01A 46 Pond 55P: POST-CULVERT-01B-1 51 Pond 58R: POST-CULVERT-01B-4 56 Pond 59P: Detention Basin 100-YR Event 62 Node Listing 63 Subcat 51S: POST-AREA-01A 65 Subcat 53S: POST-AREA-01B 68 Subcat 54S: POST-AREA-01C 71 Subcat 56S: PRE-AREA-01D 73 Subcat 62S: POST-AREA-01E 75 Reach 56R: POST-CULVERT-01B-2 80 Reach 57R: POST-CULVERT-01B-3 86 Reach 59R: POST-REACH-01B 91 Reach 61R: POST-REACH-01B-4 96 Pond 52P: POST-CULVERT-01A 101 Pond 55P: POST-CULVERT-01B-1 106 Pond 58R: POST-CULVERT-01B-4 111 Pond 59P: Detention Basin Multi-Event Tables 117 Subcat 51S: POST-AREA-01A 118 Subcat 53S: POST-AREA-01B 119 Subcat 54S: POST-AREA-01C 120 Subcat 56S: PRE-AREA-01D 121 Subcat 62S: POST-AREA-01E 122 Reach 56R: POST-CULVERT-01B-2 123 Reach 57R: POST-CULVERT-01B-3 124 Reach 59R: POST-REACH-01B 125 Reach 61R: POST-REACH-01B-4 126 Pond 52P: POST-CULVERT-01A Table of Contents03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC 127 Pond 55P: POST-CULVERT-01B-1 128 Pond 58R: POST-CULVERT-01B-4 129 Pond 59P: Detention Basin APPENDIX B2 Post-Development 25-Year and 100-Year Hydrologic Analysis For Tributary Area-02 63S POST-AREA-02 Routing Diagram for 03385-2020-20210713 Prepared by Gamba Engineering, Printed 7/14/2021 HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcat Reach Pond Link 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 2HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 25-YR Type II 24-hr Default 24.00 1 2.21 2 2 100-YR Type II 24-hr Default 24.00 1 2.81 2 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 3HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 1.017 83 1/4 acre lots, 38% imp, HSG C (63S) 0.069 71 Meadow, non-grazed, HSG C (63S) 0.051 98 Paved parking, HSG C (63S) 1.137 83 TOTAL AREA 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 4HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Soil Listing (selected nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 1.137 HSG C 63S 0.000 HSG D 0.000 Other 1.137 TOTAL AREA 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 5HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Ground Covers (selected nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 1.017 0.000 0.000 1.017 1/4 acre lots, 38% imp 63S 0.000 0.000 0.069 0.000 0.000 0.069 Meadow, non-grazed 63S 0.000 0.000 0.051 0.000 0.000 0.051 Paved parking 63S 0.000 0.000 1.137 0.000 0.000 1.137 TOTAL AREA Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 6HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Time span=5.00-30.00 hrs, dt=0.03 hrs, 834 points x 3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=1.137 ac 38.47% Impervious Runoff Depth=0.92"Subcatchment 63S: POST-AREA-02 Flow Length=303' Tc=14.4 min CN=83 Runoff=1.35 cfs 0.087 af Total Runoff Area = 1.137 ac Runoff Volume = 0.087 af Average Runoff Depth = 0.92" 61.53% Pervious = 0.700 ac 38.47% Impervious = 0.437 ac Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 7HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 63S: POST-AREA-02 Runoff = 1.35 cfs @ 12.07 hrs, Volume= 0.087 af, Depth= 0.92" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.15 Area (ac) CN Description 1.017 83 1/4 acre lots, 38% imp, HSG C 0.069 71 Meadow, non-grazed, HSG C 0.051 98 Paved parking, HSG C 1.137 83 Weighted Average 0.700 61.53% Pervious Area 0.437 38.47% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.7 200 0.1031 0.24 Sheet Flow, Developed Yards Grass: Short n= 0.150 P2= 1.33" 0.7 103 0.1088 2.31 Shallow Concentrated Flow, Developed Yard Short Grass Pasture Kv= 7.0 fps 14.4 303 Total Subcatchment 63S: POST-AREA-02 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Type II 24-hr 25-YR Rainfall=2.21" Ia/S=0.15 Runoff Area=1.137 ac Runoff Volume=0.087 af Runoff Depth=0.92" Flow Length=303' Tc=14.4 min CN=83 1.35 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 8HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 63S: POST-AREA-02 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.14 0.00 0.00 5.30 0.15 0.00 0.00 5.60 0.16 0.00 0.00 5.90 0.17 0.00 0.00 6.20 0.18 0.00 0.00 6.50 0.20 0.00 0.00 6.80 0.21 0.00 0.00 7.10 0.22 0.00 0.00 7.40 0.24 0.00 0.00 7.70 0.25 0.00 0.00 8.00 0.27 0.00 0.00 8.30 0.28 0.00 0.00 8.60 0.30 0.00 0.00 8.90 0.32 0.00 0.00 9.20 0.34 0.00 0.00 9.50 0.36 0.00 0.00 9.80 0.38 0.00 0.00 10.10 0.41 0.00 0.01 10.40 0.44 0.01 0.01 10.70 0.48 0.01 0.02 11.00 0.52 0.02 0.02 11.30 0.58 0.03 0.04 11.60 0.68 0.06 0.07 11.90 1.25 0.30 0.55 12.20 1.54 0.47 0.79 12.50 1.62 0.52 0.24 12.80 1.68 0.55 0.14 13.10 1.72 0.58 0.11 13.40 1.76 0.60 0.09 13.70 1.79 0.62 0.08 14.00 1.81 0.64 0.07 14.30 1.84 0.65 0.06 14.60 1.86 0.67 0.06 14.90 1.88 0.68 0.06 15.20 1.90 0.70 0.05 15.50 1.92 0.71 0.05 15.80 1.93 0.72 0.05 16.10 1.95 0.73 0.04 16.40 1.96 0.74 0.04 16.70 1.98 0.75 0.04 17.00 1.99 0.76 0.04 17.30 2.01 0.77 0.04 17.60 2.02 0.78 0.03 17.90 2.03 0.79 0.03 18.20 2.04 0.80 0.03 18.50 2.05 0.80 0.03 18.80 2.07 0.81 0.03 19.10 2.08 0.82 0.03 19.40 2.09 0.83 0.03 19.70 2.10 0.83 0.03 20.00 2.10 0.84 0.02 20.30 2.11 0.85 0.02 20.60 2.12 0.85 0.02 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.13 0.86 0.02 21.20 2.14 0.86 0.02 21.50 2.15 0.87 0.02 21.80 2.15 0.88 0.02 22.10 2.16 0.88 0.02 22.40 2.17 0.89 0.02 22.70 2.18 0.89 0.02 23.00 2.19 0.90 0.02 23.30 2.19 0.90 0.02 23.60 2.20 0.91 0.02 23.90 2.21 0.91 0.02 24.20 2.21 0.92 0.01 24.50 2.21 0.92 0.00 24.80 2.21 0.92 0.00 25.10 2.21 0.92 0.00 25.40 2.21 0.92 0.00 25.70 2.21 0.92 0.00 26.00 2.21 0.92 0.00 26.30 2.21 0.92 0.00 26.60 2.21 0.92 0.00 26.90 2.21 0.92 0.00 27.20 2.21 0.92 0.00 27.50 2.21 0.92 0.00 27.80 2.21 0.92 0.00 28.10 2.21 0.92 0.00 28.40 2.21 0.92 0.00 28.70 2.21 0.92 0.00 29.00 2.21 0.92 0.00 29.30 2.21 0.92 0.00 29.60 2.21 0.92 0.00 29.90 2.21 0.92 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 9HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Time span=5.00-30.00 hrs, dt=0.03 hrs, 834 points x 3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=1.137 ac 38.47% Impervious Runoff Depth=1.38"Subcatchment 63S: POST-AREA-02 Flow Length=303' Tc=14.4 min CN=83 Runoff=2.04 cfs 0.130 af Total Runoff Area = 1.137 ac Runoff Volume = 0.130 af Average Runoff Depth = 1.38" 61.53% Pervious = 0.700 ac 38.47% Impervious = 0.437 ac Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 10HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 63S: POST-AREA-02 Runoff = 2.04 cfs @ 12.07 hrs, Volume= 0.130 af, Depth= 1.38" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.15 Area (ac) CN Description 1.017 83 1/4 acre lots, 38% imp, HSG C 0.069 71 Meadow, non-grazed, HSG C 0.051 98 Paved parking, HSG C 1.137 83 Weighted Average 0.700 61.53% Pervious Area 0.437 38.47% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.7 200 0.1031 0.24 Sheet Flow, Developed Yards Grass: Short n= 0.150 P2= 1.33" 0.7 103 0.1088 2.31 Shallow Concentrated Flow, Developed Yard Short Grass Pasture Kv= 7.0 fps 14.4 303 Total Subcatchment 63S: POST-AREA-02 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)2 1 0 Type II 24-hr 100-YR Rainfall=2.81" Ia/S=0.15 Runoff Area=1.137 ac Runoff Volume=0.130 af Runoff Depth=1.38" Flow Length=303' Tc=14.4 min CN=83 2.04 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 11HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 63S: POST-AREA-02 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.18 0.00 0.00 5.30 0.19 0.00 0.00 5.60 0.21 0.00 0.00 5.90 0.22 0.00 0.00 6.20 0.24 0.00 0.00 6.50 0.25 0.00 0.00 6.80 0.27 0.00 0.00 7.10 0.28 0.00 0.00 7.40 0.30 0.00 0.00 7.70 0.32 0.00 0.00 8.00 0.34 0.00 0.00 8.30 0.36 0.00 0.00 8.60 0.38 0.00 0.00 8.90 0.40 0.00 0.01 9.20 0.43 0.01 0.01 9.50 0.46 0.01 0.01 9.80 0.49 0.01 0.01 10.10 0.52 0.02 0.02 10.40 0.56 0.03 0.03 10.70 0.60 0.04 0.04 11.00 0.66 0.05 0.05 11.30 0.73 0.07 0.07 11.60 0.86 0.12 0.12 11.90 1.60 0.50 0.89 12.20 1.96 0.74 1.18 12.50 2.07 0.81 0.34 12.80 2.13 0.86 0.20 13.10 2.19 0.90 0.16 13.40 2.23 0.93 0.13 13.70 2.27 0.96 0.11 14.00 2.30 0.99 0.10 14.30 2.33 1.01 0.09 14.60 2.36 1.03 0.08 14.90 2.39 1.05 0.08 15.20 2.41 1.07 0.07 15.50 2.44 1.09 0.07 15.80 2.46 1.10 0.06 16.10 2.48 1.12 0.06 16.40 2.50 1.13 0.06 16.70 2.52 1.15 0.05 17.00 2.53 1.16 0.05 17.30 2.55 1.17 0.05 17.60 2.57 1.19 0.05 17.90 2.58 1.20 0.05 18.20 2.60 1.21 0.05 18.50 2.61 1.22 0.04 18.80 2.63 1.23 0.04 19.10 2.64 1.24 0.04 19.40 2.65 1.25 0.04 19.70 2.66 1.26 0.04 20.00 2.68 1.27 0.03 20.30 2.69 1.28 0.03 20.60 2.70 1.29 0.03 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.71 1.30 0.03 21.20 2.72 1.30 0.03 21.50 2.73 1.31 0.03 21.80 2.74 1.32 0.03 22.10 2.75 1.33 0.03 22.40 2.76 1.34 0.03 22.70 2.77 1.34 0.03 23.00 2.78 1.35 0.03 23.30 2.79 1.36 0.03 23.60 2.80 1.37 0.03 23.90 2.81 1.37 0.03 24.20 2.81 1.38 0.01 24.50 2.81 1.38 0.00 24.80 2.81 1.38 0.00 25.10 2.81 1.38 0.00 25.40 2.81 1.38 0.00 25.70 2.81 1.38 0.00 26.00 2.81 1.38 0.00 26.30 2.81 1.38 0.00 26.60 2.81 1.38 0.00 26.90 2.81 1.38 0.00 27.20 2.81 1.38 0.00 27.50 2.81 1.38 0.00 27.80 2.81 1.38 0.00 28.10 2.81 1.38 0.00 28.40 2.81 1.38 0.00 28.70 2.81 1.38 0.00 29.00 2.81 1.38 0.00 29.30 2.81 1.38 0.00 29.60 2.81 1.38 0.00 29.90 2.81 1.38 0.00 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 12HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment 63S: POST-AREA-02 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 25-YR 2.21 1.35 0.087 0.92 100-YR 2.81 2.04 0.130 1.38 Table of Contents03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC TABLE OF CONTENTS Project Reports 1 Routing Diagram 2 Rainfall Events Listing (selected events) 3 Area Listing (selected nodes) 4 Soil Listing (selected nodes) 5 Ground Covers (selected nodes) 25-YR Event 6 Node Listing 7 Subcat 63S: POST-AREA-02 100-YR Event 9 Node Listing 10 Subcat 63S: POST-AREA-02 Multi-Event Tables 12 Subcat 63S: POST-AREA-02 APPENDIX B3 Post-Development 25-Year and 100-Year Hydrologic Analysis For Tributary Area-03 40S POST-AREA-10 42S POST-AREA-03 43R POST-CULVERT-10A 44R POST-Reach-10B 45R POST-Reach-10C 48R POST-Reach 03C 50R POST-Reach-03B 62R Storm Sewer 4 41PCB POST-AREA-10-CULVERT Routing Diagram for 03385-2020-20210713 Prepared by Gamba Engineering, Printed 7/14/2021 HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcat Reach Pond Link 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 2HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 25-YR Type II 24-hr Default 24.00 1 2.21 2 2 100-YR Type II 24-hr Default 24.00 1 2.81 2 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 3HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 0.592 81 1/3 acre lots, 30% imp, HSG C (40S) 0.493 83 1/4 acre lots, 38% imp, HSG C (42S) 0.105 87 Dirt roads, HSG C (40S) 1.734 71 Meadow, non-grazed, HSG C (40S, 42S) 0.722 57 Oak/aspen range, Fair, HSG C (40S, 42S) 0.371 98 Paved parking, HSG C (40S, 42S) 4.017 74 TOTAL AREA 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 4HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Soil Listing (selected nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 4.017 HSG C 40S, 42S 0.000 HSG D 0.000 Other 4.017 TOTAL AREA 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 5HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Ground Covers (selected nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.592 0.000 0.000 0.592 1/3 acre lots, 30% imp 40S 0.000 0.000 0.493 0.000 0.000 0.493 1/4 acre lots, 38% imp 42S 0.000 0.000 0.105 0.000 0.000 0.105 Dirt roads 40S 0.000 0.000 1.734 0.000 0.000 1.734 Meadow, non-grazed 40S, 42S 0.000 0.000 0.722 0.000 0.000 0.722 Oak/aspen range, Fair 40S, 42S 0.000 0.000 0.371 0.000 0.000 0.371 Paved parking 40S, 42S 0.000 0.000 4.017 0.000 0.000 4.017 TOTAL AREA 03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 6HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Pipe Listing (selected nodes) Line# Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) n Width (inches) Diam/Height (inches) Inside-Fill (inches) 1 43R 6,878.98 6,877.35 81.4 0.0200 0.012 0.0 12.0 0.0 2 62R 6,817.06 6,816.00 87.2 0.0122 0.012 0.0 24.0 0.0 3 41P 6,880.73 6,879.51 38.8 0.0314 0.012 0.0 12.0 9.0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 7HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Time span=5.00-30.00 hrs, dt=0.03 hrs, 834 points x 3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2.069 ac 12.55% Impervious Runoff Depth=0.55"Subcatchment 40S: POST-AREA-10 Flow Length=473' Tc=25.6 min CN=74 Runoff=0.96 cfs 0.094 af Runoff Area=1.948 ac 24.45% Impervious Runoff Depth=0.58"Subcatchment 42S: POST-AREA-03 Flow Length=919' Tc=18.2 min CN=75 Runoff=1.22 cfs 0.094 af Avg. Flow Depth=0.19' Max Vel=4.17 fps Inflow=0.44 cfs 0.081 afReach 43R: POST-CULVERT-10A 12.0" Round Pipe n=0.012 L=81.4' S=0.0200 '/' Capacity=5.46 cfs Outflow=0.44 cfs 0.081 af Avg. Flow Depth=0.04' Max Vel=2.31 fps Inflow=0.44 cfs 0.081 afReach 44R: POST-Reach-10B n=0.030 L=91.5' S=0.1635 '/' Capacity=42.19 cfs Outflow=0.44 cfs 0.081 af Avg. Flow Depth=0.21' Max Vel=3.01 fps Inflow=0.96 cfs 0.094 afReach 45R: POST-Reach-10C n=0.030 L=555.8' S=0.0748 '/' Capacity=57.23 cfs Outflow=0.94 cfs 0.094 af Avg. Flow Depth=0.13' Max Vel=2.86 fps Inflow=1.96 cfs 0.188 afReach 48R: POST-Reach 03C n=0.035 L=92.4' S=0.0937 '/' Capacity=27.38 cfs Outflow=1.96 cfs 0.188 af Avg. Flow Depth=0.29' Max Vel=3.41 fps Inflow=1.96 cfs 0.188 afReach 50R: POST-Reach-03B n=0.030 L=92.2' S=0.0639 '/' Capacity=52.88 cfs Outflow=1.96 cfs 0.188 af Avg. Flow Depth=0.36' Max Vel=5.01 fps Inflow=1.96 cfs 0.188 afReach 62R: Storm Sewer 4 24.0" Round Pipe n=0.012 L=87.2' S=0.0122 '/' Capacity=27.02 cfs Outflow=1.96 cfs 0.188 af Peak Elev=6,882.15' Inflow=0.96 cfs 0.094 afPond 41P: POST-AREA-10-CULVERT Primary=0.44 cfs 0.081 af Secondary=0.53 cfs 0.013 af Outflow=0.96 cfs 0.094 af Total Runoff Area = 4.017 ac Runoff Volume = 0.188 af Average Runoff Depth = 0.56" 81.68% Pervious = 3.281 ac 18.32% Impervious = 0.736 ac Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 8HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 40S: POST-AREA-10 [47] Hint: Peak is 1380% of capacity of segment #3 [47] Hint: Peak is 615% of capacity of segment #4 [47] Hint: Peak is 210% of capacity of segment #5 Runoff = 0.96 cfs @ 12.21 hrs, Volume= 0.094 af, Depth= 0.55" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.15 Area (ac) CN Description 0.592 81 1/3 acre lots, 30% imp, HSG C 0.986 71 Meadow, non-grazed, HSG C 0.304 57 Oak/aspen range, Fair, HSG C 0.105 87 Dirt roads, HSG C 0.082 98 Paved parking, HSG C 2.069 74 Weighted Average 1.809 87.45% Pervious Area 0.260 12.55% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 22.9 200 0.2046 0.15 Sheet Flow, Oak Brush - Meadow Woods: Light underbrush n= 0.400 P2= 1.33" 0.3 45 0.3536 2.97 Shallow Concentrated Flow, Oak Brush - Meadow Woodland Kv= 5.0 fps 1.1 64 0.0144 1.00 0.07 Trap/Vee/Rect Channel Flow, Old Irrigation Ditch Bot.W=0.00' D=0.20' Z= 1.9 & 1.6 '/' Top.W=0.70' n= 0.035 Earth, dense weeds 0.7 64 0.2359 1.57 0.16 Trap/Vee/Rect Channel Flow, Slope through Oak Brush - Meado Bot.W=4.00' D=0.02' Z= 50.0 '/' Top.W=6.00' n= 0.030 Earth, grassed & winding 0.6 100 0.0624 2.94 0.46 Trap/Vee/Rect Channel Flow, Roadside Ditch Bot.W=0.00' D=0.25' Z= 2.5 '/' Top.W=1.25' n= 0.030 Earth, grassed & winding 25.6 473 Total Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 9HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcatchment 40S: POST-AREA-10 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Type II 24-hr 25-YR Rainfall=2.21" Ia/S=0.15 Runoff Area=2.069 ac Runoff Volume=0.094 af Runoff Depth=0.55" Flow Length=473' Tc=25.6 min CN=74 0.96 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 10HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 40S: POST-AREA-10 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.14 0.00 0.00 5.30 0.15 0.00 0.00 5.60 0.16 0.00 0.00 5.90 0.17 0.00 0.00 6.20 0.18 0.00 0.00 6.50 0.20 0.00 0.00 6.80 0.21 0.00 0.00 7.10 0.22 0.00 0.00 7.40 0.24 0.00 0.00 7.70 0.25 0.00 0.00 8.00 0.27 0.00 0.00 8.30 0.28 0.00 0.00 8.60 0.30 0.00 0.00 8.90 0.32 0.00 0.00 9.20 0.34 0.00 0.00 9.50 0.36 0.00 0.00 9.80 0.38 0.00 0.00 10.10 0.41 0.00 0.00 10.40 0.44 0.00 0.00 10.70 0.48 0.00 0.00 11.00 0.52 0.00 0.00 11.30 0.58 0.00 0.00 11.60 0.68 0.01 0.01 11.90 1.25 0.12 0.15 12.20 1.54 0.23 0.96 12.50 1.62 0.26 0.49 12.80 1.68 0.28 0.24 13.10 1.72 0.30 0.16 13.40 1.76 0.32 0.13 13.70 1.79 0.33 0.11 14.00 1.81 0.34 0.09 14.30 1.84 0.36 0.08 14.60 1.86 0.37 0.08 14.90 1.88 0.38 0.07 15.20 1.90 0.39 0.07 15.50 1.92 0.39 0.06 15.80 1.93 0.40 0.06 16.10 1.95 0.41 0.06 16.40 1.96 0.42 0.05 16.70 1.98 0.42 0.05 17.00 1.99 0.43 0.05 17.30 2.01 0.44 0.05 17.60 2.02 0.44 0.05 17.90 2.03 0.45 0.04 18.20 2.04 0.46 0.04 18.50 2.05 0.46 0.04 18.80 2.07 0.47 0.04 19.10 2.08 0.47 0.04 19.40 2.09 0.48 0.04 19.70 2.10 0.48 0.04 20.00 2.10 0.49 0.03 20.30 2.11 0.49 0.03 20.60 2.12 0.50 0.03 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.13 0.50 0.03 21.20 2.14 0.51 0.03 21.50 2.15 0.51 0.03 21.80 2.15 0.51 0.03 22.10 2.16 0.52 0.03 22.40 2.17 0.52 0.03 22.70 2.18 0.53 0.03 23.00 2.19 0.53 0.03 23.30 2.19 0.54 0.03 23.60 2.20 0.54 0.03 23.90 2.21 0.54 0.03 24.20 2.21 0.55 0.02 24.50 2.21 0.55 0.01 24.80 2.21 0.55 0.00 25.10 2.21 0.55 0.00 25.40 2.21 0.55 0.00 25.70 2.21 0.55 0.00 26.00 2.21 0.55 0.00 26.30 2.21 0.55 0.00 26.60 2.21 0.55 0.00 26.90 2.21 0.55 0.00 27.20 2.21 0.55 0.00 27.50 2.21 0.55 0.00 27.80 2.21 0.55 0.00 28.10 2.21 0.55 0.00 28.40 2.21 0.55 0.00 28.70 2.21 0.55 0.00 29.00 2.21 0.55 0.00 29.30 2.21 0.55 0.00 29.60 2.21 0.55 0.00 29.90 2.21 0.55 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 11HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 42S: POST-AREA-03 Runoff = 1.22 cfs @ 12.12 hrs, Volume= 0.094 af, Depth= 0.58" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.15 Area (ac) CN Description 0.748 71 Meadow, non-grazed, HSG C 0.418 57 Oak/aspen range, Fair, HSG C 0.289 98 Paved parking, HSG C 0.493 83 1/4 acre lots, 38% imp, HSG C 1.948 75 Weighted Average 1.472 75.55% Pervious Area 0.476 24.45% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.4 228 0.0581 1.60 Sheet Flow, Driveway Pavement Smooth surfaces n= 0.011 P2= 1.33" 14.7 151 0.1275 0.17 Sheet Flow, Grass Meadow Grass: Dense n= 0.240 P2= 1.33" 1.1 540 0.0750 8.37 39.35 Trap/Vee/Rect Channel Flow, Roadside Ditch Bot.W=0.00' D=1.00' Z= 2.1 & 7.3 '/' Top.W=9.40' n= 0.030 Earth, grassed & winding 18.2 919 Total Subcatchment 42S: POST-AREA-03 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Type II 24-hr 25-YR Rainfall=2.21" Ia/S=0.15 Runoff Area=1.948 ac Runoff Volume=0.094 af Runoff Depth=0.58" Flow Length=919' Tc=18.2 min CN=75 1.22 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 12HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 42S: POST-AREA-03 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.14 0.00 0.00 5.30 0.15 0.00 0.00 5.60 0.16 0.00 0.00 5.90 0.17 0.00 0.00 6.20 0.18 0.00 0.00 6.50 0.20 0.00 0.00 6.80 0.21 0.00 0.00 7.10 0.22 0.00 0.00 7.40 0.24 0.00 0.00 7.70 0.25 0.00 0.00 8.00 0.27 0.00 0.00 8.30 0.28 0.00 0.00 8.60 0.30 0.00 0.00 8.90 0.32 0.00 0.00 9.20 0.34 0.00 0.00 9.50 0.36 0.00 0.00 9.80 0.38 0.00 0.00 10.10 0.41 0.00 0.00 10.40 0.44 0.00 0.00 10.70 0.48 0.00 0.00 11.00 0.52 0.00 0.00 11.30 0.58 0.00 0.01 11.60 0.68 0.01 0.02 11.90 1.25 0.14 0.31 12.20 1.54 0.25 1.04 12.50 1.62 0.28 0.34 12.80 1.68 0.31 0.18 13.10 1.72 0.33 0.14 13.40 1.76 0.34 0.12 13.70 1.79 0.36 0.10 14.00 1.81 0.37 0.09 14.30 1.84 0.38 0.08 14.60 1.86 0.39 0.07 14.90 1.88 0.40 0.07 15.20 1.90 0.41 0.07 15.50 1.92 0.42 0.06 15.80 1.93 0.43 0.06 16.10 1.95 0.44 0.05 16.40 1.96 0.45 0.05 16.70 1.98 0.45 0.05 17.00 1.99 0.46 0.05 17.30 2.01 0.47 0.05 17.60 2.02 0.48 0.04 17.90 2.03 0.48 0.04 18.20 2.04 0.49 0.04 18.50 2.05 0.49 0.04 18.80 2.07 0.50 0.04 19.10 2.08 0.51 0.04 19.40 2.09 0.51 0.04 19.70 2.10 0.52 0.03 20.00 2.10 0.52 0.03 20.30 2.11 0.53 0.03 20.60 2.12 0.53 0.03 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.13 0.53 0.03 21.20 2.14 0.54 0.03 21.50 2.15 0.54 0.03 21.80 2.15 0.55 0.03 22.10 2.16 0.55 0.03 22.40 2.17 0.56 0.03 22.70 2.18 0.56 0.03 23.00 2.19 0.57 0.03 23.30 2.19 0.57 0.03 23.60 2.20 0.57 0.03 23.90 2.21 0.58 0.03 24.20 2.21 0.58 0.02 24.50 2.21 0.58 0.00 24.80 2.21 0.58 0.00 25.10 2.21 0.58 0.00 25.40 2.21 0.58 0.00 25.70 2.21 0.58 0.00 26.00 2.21 0.58 0.00 26.30 2.21 0.58 0.00 26.60 2.21 0.58 0.00 26.90 2.21 0.58 0.00 27.20 2.21 0.58 0.00 27.50 2.21 0.58 0.00 27.80 2.21 0.58 0.00 28.10 2.21 0.58 0.00 28.40 2.21 0.58 0.00 28.70 2.21 0.58 0.00 29.00 2.21 0.58 0.00 29.30 2.21 0.58 0.00 29.60 2.21 0.58 0.00 29.90 2.21 0.58 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 13HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 43R: POST-CULVERT-10A [52] Hint: Inlet/Outlet conditions not evaluated Inflow Area = 2.069 ac, 12.55% Impervious, Inflow Depth = 0.47" for 25-YR event Inflow = 0.44 cfs @ 12.21 hrs, Volume= 0.081 af Outflow = 0.44 cfs @ 12.22 hrs, Volume= 0.081 af, Atten= 0%, Lag= 0.6 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 4.17 fps, Min. Travel Time= 0.3 min Avg. Velocity = 2.15 fps, Avg. Travel Time= 0.6 min Peak Storage= 9 cf @ 12.22 hrs Average Depth at Peak Storage= 0.19' , Surface Width= 0.79' Bank-Full Depth= 1.00' Flow Area= 0.8 sf, Capacity= 5.46 cfs 12.0" Round Pipe n= 0.012 Corrugated PP, smooth interior Length= 81.4' Slope= 0.0200 '/' Inlet Invert= 6,878.98', Outlet Invert= 6,877.35' Reach 43R: POST-CULVERT-10A Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=2.069 ac Avg. Flow Depth=0.19' Max Vel=4.17 fps 12.0" Round Pipe n=0.012 L=81.4' S=0.0200 '/' Capacity=5.46 cfs 0.44 cfs0.44 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 14HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 43R: POST-CULVERT-10A Primary Stage-Discharge Discharge (cfs) 543210Depth (feet)1 0 Reach 43R: POST-CULVERT-10A Storage Stage-Storage Storage (cubic-feet) 605550454035302520151050Depth (feet)1 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 15HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 43R: POST-CULVERT-10A Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,878.98 0.00 5.60 0.00 0 6,878.98 0.00 6.20 0.00 0 6,878.98 0.00 6.80 0.00 0 6,878.98 0.00 7.40 0.00 0 6,878.98 0.00 8.00 0.00 0 6,878.98 0.00 8.60 0.00 0 6,878.98 0.00 9.20 0.00 0 6,878.98 0.00 9.80 0.00 0 6,878.98 0.00 10.40 0.00 0 6,878.98 0.00 11.00 0.00 0 6,878.98 0.00 11.60 0.01 1 6,879.01 0.01 12.20 0.44 9 6,879.17 0.44 12.80 0.24 6 6,879.12 0.25 13.40 0.13 4 6,879.09 0.13 14.00 0.09 3 6,879.07 0.10 14.60 0.08 3 6,879.06 0.08 15.20 0.07 2 6,879.06 0.07 15.80 0.06 2 6,879.05 0.06 16.40 0.05 2 6,879.05 0.05 17.00 0.05 2 6,879.05 0.05 17.60 0.05 2 6,879.05 0.05 18.20 0.04 2 6,879.04 0.04 18.80 0.04 2 6,879.04 0.04 19.40 0.04 2 6,879.04 0.04 20.00 0.03 1 6,879.04 0.03 20.60 0.03 1 6,879.03 0.03 21.20 0.03 1 6,879.03 0.03 21.80 0.03 1 6,879.03 0.03 22.40 0.03 1 6,879.03 0.03 23.00 0.03 1 6,879.03 0.03 23.60 0.03 1 6,879.03 0.03 24.20 0.02 1 6,879.03 0.03 24.80 0.00 0 6,878.99 0.00 25.40 0.00 0 6,878.98 0.00 26.00 0.00 0 6,878.98 0.00 26.60 0.00 0 6,878.98 0.00 27.20 0.00 0 6,878.98 0.00 27.80 0.00 0 6,878.98 0.00 28.40 0.00 0 6,878.98 0.00 29.00 0.00 0 6,878.98 0.00 29.60 0.00 0 6,878.98 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 16HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 43R: POST-CULVERT-10A Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,878.98 0.00 0.00 6,878.99 0.62 0.00 6,879.00 0.98 0.00 6,879.01 1.28 0.01 6,879.02 1.54 0.02 6,879.03 1.79 0.03 6,879.04 2.01 0.04 6,879.05 2.22 0.05 6,879.06 2.42 0.07 6,879.07 2.61 0.09 6,879.08 2.79 0.11 6,879.09 2.96 0.14 6,879.10 3.13 0.17 6,879.11 3.29 0.20 6,879.12 3.44 0.23 6,879.13 3.59 0.27 6,879.14 3.74 0.30 6,879.15 3.88 0.34 6,879.16 4.02 0.39 6,879.17 4.15 0.43 6,879.18 4.28 0.48 6,879.19 4.40 0.53 6,879.20 4.52 0.58 6,879.21 4.64 0.63 6,879.22 4.76 0.69 6,879.23 4.87 0.75 6,879.24 4.98 0.81 6,879.25 5.09 0.87 6,879.26 5.20 0.94 6,879.27 5.30 1.00 6,879.28 5.40 1.07 6,879.29 5.49 1.14 6,879.30 5.59 1.21 6,879.31 5.68 1.28 6,879.32 5.77 1.36 6,879.33 5.86 1.44 6,879.34 5.95 1.51 6,879.35 6.03 1.59 6,879.36 6.12 1.67 6,879.37 6.20 1.76 6,879.38 6.27 1.84 6,879.39 6.35 1.93 6,879.40 6.42 2.01 6,879.41 6.50 2.10 6,879.42 6.57 2.19 6,879.43 6.64 2.28 6,879.44 6.70 2.36 6,879.45 6.77 2.46 6,879.46 6.83 2.55 6,879.47 6.89 2.64 6,879.48 6.95 2.73 6,879.49 7.01 2.82 6,879.50 7.07 2.92 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,879.51 7.12 3.01 6,879.52 7.18 3.10 6,879.53 7.23 3.20 6,879.54 7.28 3.29 6,879.55 7.32 3.39 6,879.56 7.37 3.48 6,879.57 7.42 3.58 6,879.58 7.46 3.67 6,879.59 7.50 3.76 6,879.60 7.54 3.86 6,879.61 7.58 3.95 6,879.62 7.61 4.04 6,879.63 7.64 4.13 6,879.64 7.68 4.22 6,879.65 7.71 4.31 6,879.66 7.74 4.40 6,879.67 7.76 4.49 6,879.68 7.79 4.57 6,879.69 7.81 4.66 6,879.70 7.83 4.74 6,879.71 7.85 4.82 6,879.72 7.87 4.90 6,879.73 7.88 4.98 6,879.74 7.90 5.06 6,879.75 7.91 5.13 6,879.76 7.92 5.20 6,879.77 7.92 5.27 6,879.78 7.93 5.34 6,879.79 7.93 5.40 6,879.80 7.93 5.46 6,879.81 7.92 5.52 6,879.82 7.92 5.58 6,879.83 7.91 5.63 6,879.84 7.90 5.68 6,879.85 7.88 5.72 6,879.86 7.87 5.76 6,879.87 7.84 5.79 6,879.88 7.82 5.82 6,879.89 7.79 5.84 6,879.90 7.75 5.86 6,879.91 7.71 5.87 6,879.92 7.67 5.88 6,879.93 7.61 5.87 6,879.94 7.55 5.85 6,879.95 7.48 5.82 6,879.96 7.38 5.77 6,879.97 7.26 5.69 6,879.98 6.95 5.46 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 17HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 43R: POST-CULVERT-10A Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,878.98 0.0 0 6,878.99 0.0 0 6,879.00 0.0 0 6,879.01 0.0 1 6,879.02 0.0 1 6,879.03 0.0 1 6,879.04 0.0 2 6,879.05 0.0 2 6,879.06 0.0 2 6,879.07 0.0 3 6,879.08 0.0 3 6,879.09 0.0 4 6,879.10 0.1 4 6,879.11 0.1 5 6,879.12 0.1 5 6,879.13 0.1 6 6,879.14 0.1 7 6,879.15 0.1 7 6,879.16 0.1 8 6,879.17 0.1 8 6,879.18 0.1 9 6,879.19 0.1 10 6,879.20 0.1 10 6,879.21 0.1 11 6,879.22 0.1 12 6,879.23 0.2 12 6,879.24 0.2 13 6,879.25 0.2 14 6,879.26 0.2 15 6,879.27 0.2 15 6,879.28 0.2 16 6,879.29 0.2 17 6,879.30 0.2 18 6,879.31 0.2 18 6,879.32 0.2 19 6,879.33 0.2 20 6,879.34 0.3 21 6,879.35 0.3 22 6,879.36 0.3 22 6,879.37 0.3 23 6,879.38 0.3 24 6,879.39 0.3 25 6,879.40 0.3 25 6,879.41 0.3 26 6,879.42 0.3 27 6,879.43 0.3 28 6,879.44 0.4 29 6,879.45 0.4 30 6,879.46 0.4 30 6,879.47 0.4 31 6,879.48 0.4 32 6,879.49 0.4 33 6,879.50 0.4 34 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,879.51 0.4 34 6,879.52 0.4 35 6,879.53 0.4 36 6,879.54 0.5 37 6,879.55 0.5 38 6,879.56 0.5 38 6,879.57 0.5 39 6,879.58 0.5 40 6,879.59 0.5 41 6,879.60 0.5 42 6,879.61 0.5 42 6,879.62 0.5 43 6,879.63 0.5 44 6,879.64 0.5 45 6,879.65 0.6 46 6,879.66 0.6 46 6,879.67 0.6 47 6,879.68 0.6 48 6,879.69 0.6 49 6,879.70 0.6 49 6,879.71 0.6 50 6,879.72 0.6 51 6,879.73 0.6 51 6,879.74 0.6 52 6,879.75 0.6 53 6,879.76 0.7 54 6,879.77 0.7 54 6,879.78 0.7 55 6,879.79 0.7 55 6,879.80 0.7 56 6,879.81 0.7 57 6,879.82 0.7 57 6,879.83 0.7 58 6,879.84 0.7 58 6,879.85 0.7 59 6,879.86 0.7 60 6,879.87 0.7 60 6,879.88 0.7 61 6,879.89 0.8 61 6,879.90 0.8 62 6,879.91 0.8 62 6,879.92 0.8 62 6,879.93 0.8 63 6,879.94 0.8 63 6,879.95 0.8 63 6,879.96 0.8 64 6,879.97 0.8 64 6,879.98 0.8 64 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 18HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 44R: POST-Reach-10B [61] Hint: Exceeded Reach 43R outlet invert by 0.04' @ 12.23 hrs Inflow Area = 2.069 ac, 12.55% Impervious, Inflow Depth = 0.47" for 25-YR event Inflow = 0.44 cfs @ 12.22 hrs, Volume= 0.081 af Outflow = 0.44 cfs @ 12.22 hrs, Volume= 0.081 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 2.31 fps, Min. Travel Time= 0.7 min Avg. Velocity = 1.05 fps, Avg. Travel Time= 1.4 min Peak Storage= 17 cf @ 12.22 hrs Average Depth at Peak Storage= 0.04' , Surface Width= 4.86' Bank-Full Depth= 0.50' Flow Area= 4.5 sf, Capacity= 42.19 cfs 4.00' x 0.50' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 10.0 '/' Top Width= 14.00' Length= 91.5' Slope= 0.1635 '/' Inlet Invert= 6,877.35', Outlet Invert= 6,862.39' ‡ Reach 44R: POST-Reach-10B Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=2.069 ac Avg. Flow Depth=0.04' Max Vel=2.31 fps n=0.030 L=91.5' S=0.1635 '/' Capacity=42.19 cfs 0.44 cfs0.44 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 19HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 44R: POST-Reach-10B Primary Stage-Discharge Discharge (cfs) 4035302520151050Depth (feet)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Reach 44R: POST-Reach-10B Storage Stage-Storage Storage (cubic-feet) 400350300250200150100500Depth (feet)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 20HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 44R: POST-Reach-10B Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,877.35 0.00 5.60 0.00 0 6,877.35 0.00 6.20 0.00 0 6,877.35 0.00 6.80 0.00 0 6,877.35 0.00 7.40 0.00 0 6,877.35 0.00 8.00 0.00 0 6,877.35 0.00 8.60 0.00 0 6,877.35 0.00 9.20 0.00 0 6,877.35 0.00 9.80 0.00 0 6,877.35 0.00 10.40 0.00 0 6,877.35 0.00 11.00 0.00 0 6,877.35 0.00 11.60 0.01 1 6,877.35 0.01 12.20 0.44 17 6,877.39 0.44 12.80 0.25 12 6,877.38 0.25 13.40 0.13 8 6,877.37 0.13 14.00 0.10 7 6,877.37 0.10 14.60 0.08 6 6,877.37 0.08 15.20 0.07 5 6,877.36 0.07 15.80 0.06 5 6,877.36 0.06 16.40 0.05 5 6,877.36 0.05 17.00 0.05 4 6,877.36 0.05 17.60 0.05 4 6,877.36 0.05 18.20 0.04 4 6,877.36 0.04 18.80 0.04 4 6,877.36 0.04 19.40 0.04 4 6,877.36 0.04 20.00 0.03 3 6,877.36 0.03 20.60 0.03 3 6,877.36 0.03 21.20 0.03 3 6,877.36 0.03 21.80 0.03 3 6,877.36 0.03 22.40 0.03 3 6,877.36 0.03 23.00 0.03 3 6,877.36 0.03 23.60 0.03 3 6,877.36 0.03 24.20 0.03 3 6,877.36 0.03 24.80 0.00 0 6,877.35 0.00 25.40 0.00 0 6,877.35 0.00 26.00 0.00 0 6,877.35 0.00 26.60 0.00 0 6,877.35 0.00 27.20 0.00 0 6,877.35 0.00 27.80 0.00 0 6,877.35 0.00 28.40 0.00 0 6,877.35 0.00 29.00 0.00 0 6,877.35 0.00 29.60 0.00 0 6,877.35 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 21HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 44R: POST-Reach-10B Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,877.35 0.00 0.00 6,877.36 0.91 0.04 6,877.37 1.43 0.12 6,877.38 1.85 0.24 6,877.39 2.21 0.39 6,877.40 2.53 0.57 6,877.41 2.83 0.78 6,877.42 3.10 1.02 6,877.43 3.35 1.29 6,877.44 3.59 1.58 6,877.45 3.82 1.91 6,877.46 4.03 2.26 6,877.47 4.24 2.64 6,877.48 4.43 3.06 6,877.49 4.62 3.50 6,877.50 4.81 3.97 6,877.51 4.98 4.47 6,877.52 5.16 5.00 6,877.53 5.32 5.56 6,877.54 5.49 6.15 6,877.55 5.64 6.77 6,877.56 5.80 7.43 6,877.57 5.95 8.12 6,877.58 6.10 8.84 6,877.59 6.24 9.59 6,877.60 6.39 10.38 6,877.61 6.53 11.20 6,877.62 6.66 12.05 6,877.63 6.80 12.94 6,877.64 6.93 13.87 6,877.65 7.06 14.83 6,877.66 7.19 15.83 6,877.67 7.32 16.86 6,877.68 7.44 17.93 6,877.69 7.57 19.04 6,877.70 7.69 20.18 6,877.71 7.81 21.37 6,877.72 7.93 22.59 6,877.73 8.05 23.85 6,877.74 8.16 25.15 6,877.75 8.28 26.49 6,877.76 8.39 27.88 6,877.77 8.51 29.30 6,877.78 8.62 30.76 6,877.79 8.73 32.27 6,877.80 8.84 33.81 6,877.81 8.95 35.40 6,877.82 9.06 37.03 6,877.83 9.16 38.71 6,877.84 9.27 40.43 6,877.85 9.38 42.19 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 22HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 44R: POST-Reach-10B Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,877.35 0.0 0 6,877.36 0.0 4 6,877.37 0.1 8 6,877.38 0.1 12 6,877.39 0.2 16 6,877.40 0.2 21 6,877.41 0.3 25 6,877.42 0.3 30 6,877.43 0.4 35 6,877.44 0.4 40 6,877.45 0.5 46 6,877.46 0.6 51 6,877.47 0.6 57 6,877.48 0.7 63 6,877.49 0.8 69 6,877.50 0.8 75 6,877.51 0.9 82 6,877.52 1.0 89 6,877.53 1.0 96 6,877.54 1.1 103 6,877.55 1.2 110 6,877.56 1.3 117 6,877.57 1.4 125 6,877.58 1.4 133 6,877.59 1.5 141 6,877.60 1.6 149 6,877.61 1.7 157 6,877.62 1.8 166 6,877.63 1.9 174 6,877.64 2.0 183 6,877.65 2.1 192 6,877.66 2.2 201 6,877.67 2.3 211 6,877.68 2.4 220 6,877.69 2.5 230 6,877.70 2.6 240 6,877.71 2.7 250 6,877.72 2.8 261 6,877.73 3.0 271 6,877.74 3.1 282 6,877.75 3.2 293 6,877.76 3.3 304 6,877.77 3.4 315 6,877.78 3.6 327 6,877.79 3.7 338 6,877.80 3.8 350 6,877.81 4.0 362 6,877.82 4.1 374 6,877.83 4.2 386 6,877.84 4.4 399 6,877.85 4.5 412 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 23HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 45R: POST-Reach-10C [62] Hint: Exceeded Reach 44R OUTLET depth by 0.17' @ 12.26 hrs Inflow Area = 2.069 ac, 12.55% Impervious, Inflow Depth = 0.55" for 25-YR event Inflow = 0.96 cfs @ 12.21 hrs, Volume= 0.094 af Outflow = 0.94 cfs @ 12.26 hrs, Volume= 0.094 af, Atten= 3%, Lag= 2.7 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 3.01 fps, Min. Travel Time= 3.1 min Avg. Velocity = 1.38 fps, Avg. Travel Time= 6.7 min Peak Storage= 173 cf @ 12.26 hrs Average Depth at Peak Storage= 0.21' , Surface Width= 2.91' Bank-Full Depth= 1.00' Flow Area= 6.8 sf, Capacity= 57.23 cfs 0.00' x 1.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 1.9 11.7 '/' Top Width= 13.60' Length= 555.8' Slope= 0.0748 '/' Inlet Invert= 6,862.39', Outlet Invert= 6,820.81' ‡ Reach 45R: POST-Reach-10C Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Inflow Area=2.069 ac Avg. Flow Depth=0.21' Max Vel=3.01 fps n=0.030 L=555.8' S=0.0748 '/' Capacity=57.23 cfs 0.96 cfs 0.94 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 24HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 45R: POST-Reach-10C Primary Stage-Discharge Discharge (cfs) 5550454035302520151050Depth (feet)1 0 Reach 45R: POST-Reach-10C Storage Stage-Storage Storage (cubic-feet) 3,5003,0002,5002,0001,5001,0005000Depth (feet)1 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 25HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 45R: POST-Reach-10C Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,862.39 0.00 5.60 0.00 0 6,862.39 0.00 6.20 0.00 0 6,862.39 0.00 6.80 0.00 0 6,862.39 0.00 7.40 0.00 0 6,862.39 0.00 8.00 0.00 0 6,862.39 0.00 8.60 0.00 0 6,862.39 0.00 9.20 0.00 0 6,862.39 0.00 9.80 0.00 0 6,862.39 0.00 10.40 0.00 0 6,862.39 0.00 11.00 0.00 0 6,862.39 0.00 11.60 0.01 2 6,862.41 0.00 12.20 0.96 166 6,862.60 0.89 12.80 0.25 70 6,862.53 0.28 13.40 0.13 40 6,862.49 0.13 14.00 0.10 32 6,862.48 0.10 14.60 0.08 27 6,862.47 0.08 15.20 0.07 25 6,862.47 0.07 15.80 0.06 23 6,862.47 0.06 16.40 0.05 20 6,862.46 0.05 17.00 0.05 19 6,862.46 0.05 17.60 0.05 18 6,862.46 0.05 18.20 0.04 17 6,862.46 0.04 18.80 0.04 16 6,862.46 0.04 19.40 0.04 15 6,862.45 0.04 20.00 0.03 14 6,862.45 0.03 20.60 0.03 14 6,862.45 0.03 21.20 0.03 13 6,862.45 0.03 21.80 0.03 13 6,862.45 0.03 22.40 0.03 13 6,862.45 0.03 23.00 0.03 13 6,862.45 0.03 23.60 0.03 13 6,862.45 0.03 24.20 0.03 12 6,862.45 0.03 24.80 0.00 3 6,862.42 0.00 25.40 0.00 0 6,862.40 0.00 26.00 0.00 0 6,862.39 0.00 26.60 0.00 0 6,862.39 0.00 27.20 0.00 0 6,862.39 0.00 27.80 0.00 0 6,862.39 0.00 28.40 0.00 0 6,862.39 0.00 29.00 0.00 0 6,862.39 0.00 29.60 0.00 0 6,862.39 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 26HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 45R: POST-Reach-10C Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,862.39 0.00 0.00 6,862.40 0.39 0.00 6,862.41 0.62 0.00 6,862.42 0.81 0.00 6,862.43 0.98 0.01 6,862.44 1.14 0.02 6,862.45 1.29 0.03 6,862.46 1.43 0.05 6,862.47 1.56 0.07 6,862.48 1.69 0.09 6,862.49 1.81 0.12 6,862.50 1.93 0.16 6,862.51 2.05 0.20 6,862.52 2.16 0.25 6,862.53 2.27 0.30 6,862.54 2.38 0.36 6,862.55 2.48 0.43 6,862.56 2.58 0.51 6,862.57 2.68 0.59 6,862.58 2.78 0.68 6,862.59 2.88 0.78 6,862.60 2.97 0.89 6,862.61 3.07 1.01 6,862.62 3.16 1.14 6,862.63 3.25 1.27 6,862.64 3.34 1.42 6,862.65 3.43 1.58 6,862.66 3.52 1.74 6,862.67 3.60 1.92 6,862.68 3.69 2.11 6,862.69 3.77 2.31 6,862.70 3.85 2.52 6,862.71 3.94 2.74 6,862.72 4.02 2.98 6,862.73 4.10 3.22 6,862.74 4.18 3.48 6,862.75 4.26 3.75 6,862.76 4.34 4.04 6,862.77 4.42 4.34 6,862.78 4.49 4.65 6,862.79 4.57 4.97 6,862.80 4.64 5.31 6,862.81 4.72 5.66 6,862.82 4.79 6.03 6,862.83 4.87 6.41 6,862.84 4.94 6.81 6,862.85 5.01 7.22 6,862.86 5.09 7.64 6,862.87 5.16 8.08 6,862.88 5.23 8.54 6,862.89 5.30 9.01 6,862.90 5.37 9.50 6,862.91 5.44 10.01 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,862.92 5.51 10.53 6,862.93 5.58 11.07 6,862.94 5.65 11.62 6,862.95 5.72 12.19 6,862.96 5.79 12.78 6,862.97 5.85 13.39 6,862.98 5.92 14.01 6,862.99 5.99 14.66 6,863.00 6.05 15.32 6,863.01 6.12 15.99 6,863.02 6.18 16.69 6,863.03 6.25 17.41 6,863.04 6.31 18.14 6,863.05 6.38 18.90 6,863.06 6.44 19.67 6,863.07 6.51 20.46 6,863.08 6.57 21.27 6,863.09 6.63 22.11 6,863.10 6.70 22.96 6,863.11 6.76 23.83 6,863.12 6.82 24.72 6,863.13 6.89 25.64 6,863.14 6.95 26.57 6,863.15 7.01 27.53 6,863.16 7.07 28.50 6,863.17 7.13 29.50 6,863.18 7.19 30.52 6,863.19 7.25 31.56 6,863.20 7.31 32.63 6,863.21 7.37 33.71 6,863.22 7.43 34.82 6,863.23 7.49 35.95 6,863.24 7.55 37.10 6,863.25 7.61 38.28 6,863.26 7.67 39.47 6,863.27 7.73 40.70 6,863.28 7.79 41.94 6,863.29 7.84 43.21 6,863.30 7.90 44.50 6,863.31 7.96 45.82 6,863.32 8.02 47.16 6,863.33 8.08 48.52 6,863.34 8.13 49.91 6,863.35 8.19 51.32 6,863.36 8.25 52.76 6,863.37 8.30 54.23 6,863.38 8.36 55.71 6,863.39 8.42 57.23 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 27HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 45R: POST-Reach-10C Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,862.39 0.0 0 6,862.40 0.0 0 6,862.41 0.0 2 6,862.42 0.0 3 6,862.43 0.0 6 6,862.44 0.0 9 6,862.45 0.0 14 6,862.46 0.0 19 6,862.47 0.0 24 6,862.48 0.1 31 6,862.49 0.1 38 6,862.50 0.1 46 6,862.51 0.1 54 6,862.52 0.1 64 6,862.53 0.1 74 6,862.54 0.2 85 6,862.55 0.2 97 6,862.56 0.2 109 6,862.57 0.2 122 6,862.58 0.2 136 6,862.59 0.3 151 6,862.60 0.3 167 6,862.61 0.3 183 6,862.62 0.4 200 6,862.63 0.4 218 6,862.64 0.4 236 6,862.65 0.5 255 6,862.66 0.5 276 6,862.67 0.5 296 6,862.68 0.6 318 6,862.69 0.6 340 6,862.70 0.7 363 6,862.71 0.7 387 6,862.72 0.7 412 6,862.73 0.8 437 6,862.74 0.8 463 6,862.75 0.9 490 6,862.76 0.9 517 6,862.77 1.0 546 6,862.78 1.0 575 6,862.79 1.1 605 6,862.80 1.1 635 6,862.81 1.2 667 6,862.82 1.3 699 6,862.83 1.3 732 6,862.84 1.4 765 6,862.85 1.4 800 6,862.86 1.5 835 6,862.87 1.6 871 6,862.88 1.6 907 6,862.89 1.7 945 6,862.90 1.8 983 6,862.91 1.8 1,022 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,862.92 1.9 1,062 6,862.93 2.0 1,102 6,862.94 2.1 1,143 6,862.95 2.1 1,185 6,862.96 2.2 1,228 6,862.97 2.3 1,271 6,862.98 2.4 1,316 6,862.99 2.4 1,361 6,863.00 2.5 1,406 6,863.01 2.6 1,453 6,863.02 2.7 1,500 6,863.03 2.8 1,548 6,863.04 2.9 1,597 6,863.05 3.0 1,646 6,863.06 3.1 1,697 6,863.07 3.1 1,748 6,863.08 3.2 1,799 6,863.09 3.3 1,852 6,863.10 3.4 1,905 6,863.11 3.5 1,959 6,863.12 3.6 2,014 6,863.13 3.7 2,070 6,863.14 3.8 2,126 6,863.15 3.9 2,183 6,863.16 4.0 2,241 6,863.17 4.1 2,299 6,863.18 4.2 2,359 6,863.19 4.4 2,419 6,863.20 4.5 2,480 6,863.21 4.6 2,541 6,863.22 4.7 2,604 6,863.23 4.8 2,667 6,863.24 4.9 2,731 6,863.25 5.0 2,795 6,863.26 5.1 2,861 6,863.27 5.3 2,927 6,863.28 5.4 2,994 6,863.29 5.5 3,061 6,863.30 5.6 3,130 6,863.31 5.8 3,199 6,863.32 5.9 3,269 6,863.33 6.0 3,340 6,863.34 6.1 3,411 6,863.35 6.3 3,483 6,863.36 6.4 3,556 6,863.37 6.5 3,630 6,863.38 6.7 3,704 6,863.39 6.8 3,779 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 28HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 48R: POST-Reach 03C [61] Hint: Exceeded Reach 50R outlet invert by 0.13' @ 12.20 hrs Inflow Area = 4.017 ac, 18.32% Impervious, Inflow Depth = 0.56" for 25-YR event Inflow = 1.96 cfs @ 12.18 hrs, Volume= 0.188 af Outflow = 1.96 cfs @ 12.19 hrs, Volume= 0.188 af, Atten= 0%, Lag= 0.4 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 2.86 fps, Min. Travel Time= 0.5 min Avg. Velocity = 0.98 fps, Avg. Travel Time= 1.6 min Peak Storage= 63 cf @ 12.19 hrs Average Depth at Peak Storage= 0.13' , Surface Width= 6.58' Bank-Full Depth= 0.50' Flow Area= 4.5 sf, Capacity= 27.38 cfs 4.00' x 0.50' deep channel, n= 0.035 Earth, dense weeds Side Slope Z-value= 10.0 '/' Top Width= 14.00' Length= 92.4' Slope= 0.0937 '/' Inlet Invert= 6,810.65', Outlet Invert= 6,801.99' ‡ Reach 48R: POST-Reach 03C Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)2 1 0 Inflow Area=4.017 ac Avg. Flow Depth=0.13' Max Vel=2.86 fps n=0.035 L=92.4' S=0.0937 '/' Capacity=27.38 cfs 1.96 cfs1.96 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 29HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 48R: POST-Reach 03C Primary Stage-Discharge Discharge (cfs) 26242220181614121086420Depth (feet)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Reach 48R: POST-Reach 03C Storage Stage-Storage Storage (cubic-feet) 400350300250200150100500Depth (feet)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 30HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 48R: POST-Reach 03C Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,810.65 0.00 5.60 0.00 0 6,810.65 0.00 6.20 0.00 0 6,810.65 0.00 6.80 0.00 0 6,810.65 0.00 7.40 0.00 0 6,810.65 0.00 8.00 0.00 0 6,810.65 0.00 8.60 0.00 0 6,810.65 0.00 9.20 0.00 0 6,810.65 0.00 9.80 0.00 0 6,810.65 0.00 10.40 0.00 0 6,810.65 0.00 11.00 0.00 0 6,810.65 0.00 11.60 0.02 3 6,810.66 0.02 12.20 1.95 63 6,810.78 1.95 12.80 0.48 25 6,810.71 0.48 13.40 0.25 16 6,810.69 0.26 14.00 0.19 14 6,810.68 0.19 14.60 0.15 12 6,810.68 0.15 15.20 0.14 11 6,810.68 0.14 15.80 0.12 10 6,810.68 0.12 16.40 0.11 9 6,810.67 0.11 17.00 0.10 9 6,810.67 0.10 17.60 0.09 9 6,810.67 0.09 18.20 0.09 8 6,810.67 0.09 18.80 0.08 8 6,810.67 0.08 19.40 0.07 7 6,810.67 0.07 20.00 0.07 7 6,810.67 0.07 20.60 0.06 7 6,810.67 0.06 21.20 0.06 7 6,810.67 0.06 21.80 0.06 7 6,810.67 0.06 22.40 0.06 6 6,810.67 0.06 23.00 0.06 6 6,810.67 0.06 23.60 0.06 6 6,810.67 0.06 24.20 0.05 6 6,810.67 0.05 24.80 0.01 2 6,810.65 0.01 25.40 0.00 0 6,810.65 0.00 26.00 0.00 0 6,810.65 0.00 26.60 0.00 0 6,810.65 0.00 27.20 0.00 0 6,810.65 0.00 27.80 0.00 0 6,810.65 0.00 28.40 0.00 0 6,810.65 0.00 29.00 0.00 0 6,810.65 0.00 29.60 0.00 0 6,810.65 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 31HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 48R: POST-Reach 03C Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,810.65 0.00 0.00 6,810.66 0.59 0.02 6,810.67 0.93 0.08 6,810.68 1.20 0.15 6,810.69 1.43 0.25 6,810.70 1.64 0.37 6,810.71 1.83 0.51 6,810.72 2.01 0.66 6,810.73 2.18 0.84 6,810.74 2.33 1.03 6,810.75 2.48 1.24 6,810.76 2.62 1.47 6,810.77 2.75 1.72 6,810.78 2.88 1.98 6,810.79 3.00 2.27 6,810.80 3.12 2.57 6,810.81 3.24 2.90 6,810.82 3.35 3.24 6,810.83 3.46 3.61 6,810.84 3.56 3.99 6,810.85 3.66 4.40 6,810.86 3.76 4.82 6,810.87 3.86 5.27 6,810.88 3.96 5.74 6,810.89 4.05 6.22 6,810.90 4.14 6.73 6,810.91 4.24 7.27 6,810.92 4.32 7.82 6,810.93 4.41 8.40 6,810.94 4.50 9.00 6,810.95 4.58 9.62 6,810.96 4.67 10.27 6,810.97 4.75 10.94 6,810.98 4.83 11.64 6,810.99 4.91 12.36 6,811.00 4.99 13.10 6,811.01 5.07 13.87 6,811.02 5.15 14.66 6,811.03 5.22 15.48 6,811.04 5.30 16.32 6,811.05 5.37 17.19 6,811.06 5.45 18.09 6,811.07 5.52 19.01 6,811.08 5.59 19.96 6,811.09 5.67 20.94 6,811.10 5.74 21.94 6,811.11 5.81 22.97 6,811.12 5.88 24.03 6,811.13 5.95 25.12 6,811.14 6.02 26.24 6,811.15 6.08 27.38 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 32HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 48R: POST-Reach 03C Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,810.65 0.0 0 6,810.66 0.0 4 6,810.67 0.1 8 6,810.68 0.1 12 6,810.69 0.2 16 6,810.70 0.2 21 6,810.71 0.3 26 6,810.72 0.3 30 6,810.73 0.4 35 6,810.74 0.4 41 6,810.75 0.5 46 6,810.76 0.6 52 6,810.77 0.6 58 6,810.78 0.7 64 6,810.79 0.8 70 6,810.80 0.8 76 6,810.81 0.9 83 6,810.82 1.0 90 6,810.83 1.0 96 6,810.84 1.1 104 6,810.85 1.2 111 6,810.86 1.3 118 6,810.87 1.4 126 6,810.88 1.4 134 6,810.89 1.5 142 6,810.90 1.6 150 6,810.91 1.7 159 6,810.92 1.8 167 6,810.93 1.9 176 6,810.94 2.0 185 6,810.95 2.1 194 6,810.96 2.2 203 6,810.97 2.3 213 6,810.98 2.4 223 6,810.99 2.5 232 6,811.00 2.6 243 6,811.01 2.7 253 6,811.02 2.8 263 6,811.03 3.0 274 6,811.04 3.1 285 6,811.05 3.2 296 6,811.06 3.3 307 6,811.07 3.4 318 6,811.08 3.6 330 6,811.09 3.7 342 6,811.10 3.8 353 6,811.11 4.0 366 6,811.12 4.1 378 6,811.13 4.2 390 6,811.14 4.4 403 6,811.15 4.5 416 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 33HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 50R: POST-Reach-03B [62] Hint: Exceeded Reach 62R OUTLET depth by 0.55' @ 25.10 hrs Inflow Area = 4.017 ac, 18.32% Impervious, Inflow Depth = 0.56" for 25-YR event Inflow = 1.96 cfs @ 12.17 hrs, Volume= 0.188 af Outflow = 1.96 cfs @ 12.18 hrs, Volume= 0.188 af, Atten= 0%, Lag= 0.3 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 3.41 fps, Min. Travel Time= 0.5 min Avg. Velocity = 1.51 fps, Avg. Travel Time= 1.0 min Peak Storage= 53 cf @ 12.18 hrs Average Depth at Peak Storage= 0.29' , Surface Width= 3.95' Bank-Full Depth= 1.00' Flow Area= 6.8 sf, Capacity= 52.88 cfs 0.00' x 1.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 1.9 11.7 '/' Top Width= 13.60' Length= 92.2' Slope= 0.0639 '/' Inlet Invert= 6,816.54', Outlet Invert= 6,810.65' ‡ Reach 50R: POST-Reach-03B Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)2 1 0 Inflow Area=4.017 ac Avg. Flow Depth=0.29' Max Vel=3.41 fps n=0.030 L=92.2' S=0.0639 '/' Capacity=52.88 cfs 1.96 cfs1.96 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 34HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 50R: POST-Reach-03B Primary Stage-Discharge Discharge (cfs) 50454035302520151050Depth (feet)1 0 Reach 50R: POST-Reach-03B Storage Stage-Storage Storage (cubic-feet) 600550500450400350300250200150100500Depth (feet)1 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 35HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 50R: POST-Reach-03B Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,816.54 0.00 5.60 0.00 0 6,816.54 0.00 6.20 0.00 0 6,816.54 0.00 6.80 0.00 0 6,816.54 0.00 7.40 0.00 0 6,816.54 0.00 8.00 0.00 0 6,816.54 0.00 8.60 0.00 0 6,816.54 0.00 9.20 0.00 0 6,816.54 0.00 9.80 0.00 0 6,816.54 0.00 10.40 0.00 0 6,816.54 0.00 11.00 0.00 0 6,816.54 0.00 11.60 0.02 2 6,816.59 0.02 12.20 1.94 53 6,816.83 1.95 12.80 0.47 18 6,816.71 0.48 13.40 0.25 11 6,816.68 0.25 14.00 0.19 9 6,816.66 0.19 14.60 0.15 8 6,816.65 0.15 15.20 0.14 7 6,816.65 0.14 15.80 0.12 7 6,816.64 0.12 16.40 0.10 6 6,816.64 0.11 17.00 0.10 6 6,816.63 0.10 17.60 0.09 5 6,816.63 0.09 18.20 0.09 5 6,816.63 0.09 18.80 0.08 5 6,816.63 0.08 19.40 0.07 4 6,816.62 0.07 20.00 0.07 4 6,816.62 0.07 20.60 0.06 4 6,816.62 0.06 21.20 0.06 4 6,816.62 0.06 21.80 0.06 4 6,816.62 0.06 22.40 0.06 4 6,816.62 0.06 23.00 0.06 4 6,816.62 0.06 23.60 0.06 4 6,816.62 0.06 24.20 0.05 3 6,816.61 0.05 24.80 0.00 1 6,816.57 0.01 25.40 0.00 0 6,816.55 0.00 26.00 0.00 0 6,816.54 0.00 26.60 0.00 0 6,816.54 0.00 27.20 0.00 0 6,816.54 0.00 27.80 0.00 0 6,816.54 0.00 28.40 0.00 0 6,816.54 0.00 29.00 0.00 0 6,816.54 0.00 29.60 0.00 0 6,816.54 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 36HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 50R: POST-Reach-03B Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,816.54 0.00 0.00 6,816.55 0.36 0.00 6,816.56 0.57 0.00 6,816.57 0.75 0.00 6,816.58 0.91 0.01 6,816.59 1.06 0.02 6,816.60 1.19 0.03 6,816.61 1.32 0.04 6,816.62 1.44 0.06 6,816.63 1.56 0.09 6,816.64 1.68 0.11 6,816.65 1.79 0.15 6,816.66 1.89 0.19 6,816.67 2.00 0.23 6,816.68 2.10 0.28 6,816.69 2.20 0.34 6,816.70 2.29 0.40 6,816.71 2.39 0.47 6,816.72 2.48 0.55 6,816.73 2.57 0.63 6,816.74 2.66 0.72 6,816.75 2.75 0.82 6,816.76 2.83 0.93 6,816.77 2.92 1.05 6,816.78 3.00 1.18 6,816.79 3.09 1.31 6,816.80 3.17 1.46 6,816.81 3.25 1.61 6,816.82 3.33 1.77 6,816.83 3.41 1.95 6,816.84 3.49 2.13 6,816.85 3.56 2.33 6,816.86 3.64 2.53 6,816.87 3.71 2.75 6,816.88 3.79 2.98 6,816.89 3.86 3.22 6,816.90 3.94 3.47 6,816.91 4.01 3.73 6,816.92 4.08 4.01 6,816.93 4.15 4.29 6,816.94 4.22 4.59 6,816.95 4.29 4.91 6,816.96 4.36 5.23 6,816.97 4.43 5.57 6,816.98 4.50 5.92 6,816.99 4.57 6.29 6,817.00 4.63 6.67 6,817.01 4.70 7.06 6,817.02 4.77 7.47 6,817.03 4.83 7.89 6,817.04 4.90 8.33 6,817.05 4.96 8.78 6,817.06 5.03 9.25 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,817.07 5.09 9.73 6,817.08 5.16 10.23 6,817.09 5.22 10.74 6,817.10 5.28 11.27 6,817.11 5.35 11.81 6,817.12 5.41 12.37 6,817.13 5.47 12.95 6,817.14 5.53 13.54 6,817.15 5.59 14.15 6,817.16 5.65 14.78 6,817.17 5.72 15.42 6,817.18 5.78 16.09 6,817.19 5.84 16.77 6,817.20 5.90 17.46 6,817.21 5.95 18.18 6,817.22 6.01 18.91 6,817.23 6.07 19.66 6,817.24 6.13 20.43 6,817.25 6.19 21.22 6,817.26 6.25 22.02 6,817.27 6.30 22.85 6,817.28 6.36 23.69 6,817.29 6.42 24.55 6,817.30 6.48 25.44 6,817.31 6.53 26.34 6,817.32 6.59 27.26 6,817.33 6.65 28.20 6,817.34 6.70 29.17 6,817.35 6.76 30.15 6,817.36 6.81 31.15 6,817.37 6.87 32.17 6,817.38 6.92 33.22 6,817.39 6.98 34.28 6,817.40 7.03 35.37 6,817.41 7.09 36.48 6,817.42 7.14 37.61 6,817.43 7.20 38.76 6,817.44 7.25 39.93 6,817.45 7.30 41.12 6,817.46 7.36 42.34 6,817.47 7.41 43.58 6,817.48 7.46 44.84 6,817.49 7.52 46.12 6,817.50 7.57 47.43 6,817.51 7.62 48.76 6,817.52 7.67 50.11 6,817.53 7.72 51.48 6,817.54 7.78 52.88 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 37HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 50R: POST-Reach-03B Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,816.54 0.0 0 6,816.55 0.0 0 6,816.56 0.0 0 6,816.57 0.0 1 6,816.58 0.0 1 6,816.59 0.0 2 6,816.60 0.0 2 6,816.61 0.0 3 6,816.62 0.0 4 6,816.63 0.1 5 6,816.64 0.1 6 6,816.65 0.1 8 6,816.66 0.1 9 6,816.67 0.1 11 6,816.68 0.1 12 6,816.69 0.2 14 6,816.70 0.2 16 6,816.71 0.2 18 6,816.72 0.2 20 6,816.73 0.2 23 6,816.74 0.3 25 6,816.75 0.3 28 6,816.76 0.3 30 6,816.77 0.4 33 6,816.78 0.4 36 6,816.79 0.4 39 6,816.80 0.5 42 6,816.81 0.5 46 6,816.82 0.5 49 6,816.83 0.6 53 6,816.84 0.6 56 6,816.85 0.7 60 6,816.86 0.7 64 6,816.87 0.7 68 6,816.88 0.8 72 6,816.89 0.8 77 6,816.90 0.9 81 6,816.91 0.9 86 6,816.92 1.0 91 6,816.93 1.0 95 6,816.94 1.1 100 6,816.95 1.1 105 6,816.96 1.2 111 6,816.97 1.3 116 6,816.98 1.3 121 6,816.99 1.4 127 6,817.00 1.4 133 6,817.01 1.5 138 6,817.02 1.6 144 6,817.03 1.6 151 6,817.04 1.7 157 6,817.05 1.8 163 6,817.06 1.8 170 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,817.07 1.9 176 6,817.08 2.0 183 6,817.09 2.1 190 6,817.10 2.1 197 6,817.11 2.2 204 6,817.12 2.3 211 6,817.13 2.4 218 6,817.14 2.4 226 6,817.15 2.5 233 6,817.16 2.6 241 6,817.17 2.7 249 6,817.18 2.8 257 6,817.19 2.9 265 6,817.20 3.0 273 6,817.21 3.1 281 6,817.22 3.1 290 6,817.23 3.2 298 6,817.24 3.3 307 6,817.25 3.4 316 6,817.26 3.5 325 6,817.27 3.6 334 6,817.28 3.7 343 6,817.29 3.8 353 6,817.30 3.9 362 6,817.31 4.0 372 6,817.32 4.1 381 6,817.33 4.2 391 6,817.34 4.4 401 6,817.35 4.5 411 6,817.36 4.6 422 6,817.37 4.7 432 6,817.38 4.8 442 6,817.39 4.9 453 6,817.40 5.0 464 6,817.41 5.1 475 6,817.42 5.3 486 6,817.43 5.4 497 6,817.44 5.5 508 6,817.45 5.6 519 6,817.46 5.8 531 6,817.47 5.9 542 6,817.48 6.0 554 6,817.49 6.1 566 6,817.50 6.3 578 6,817.51 6.4 590 6,817.52 6.5 602 6,817.53 6.7 614 6,817.54 6.8 627 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 38HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 62R: Storm Sewer 4 [52] Hint: Inlet/Outlet conditions not evaluated Inflow Area = 4.017 ac, 18.32% Impervious, Inflow Depth = 0.56" for 25-YR event Inflow = 1.96 cfs @ 12.17 hrs, Volume= 0.188 af Outflow = 1.96 cfs @ 12.17 hrs, Volume= 0.188 af, Atten= 0%, Lag= 0.2 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 5.01 fps, Min. Travel Time= 0.3 min Avg. Velocity = 1.98 fps, Avg. Travel Time= 0.7 min Peak Storage= 34 cf @ 12.17 hrs Average Depth at Peak Storage= 0.36' , Surface Width= 1.54' Bank-Full Depth= 2.00' Flow Area= 3.1 sf, Capacity= 27.02 cfs 24.0" Round Pipe n= 0.012 Length= 87.2' Slope= 0.0122 '/' Inlet Invert= 6,817.06', Outlet Invert= 6,816.00' Reach 62R: Storm Sewer 4 Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)2 1 0 Inflow Area=4.017 ac Avg. Flow Depth=0.36' Max Vel=5.01 fps 24.0" Round Pipe n=0.012 L=87.2' S=0.0122 '/' Capacity=27.02 cfs 1.96 cfs1.96 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 39HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 62R: Storm Sewer 4 Primary Stage-Discharge Discharge (cfs) 2826242220181614121086420Depth (feet)2 1 0 Reach 62R: Storm Sewer 4 Storage Stage-Storage Storage (cubic-feet) 260240220200180160140120100806040200Depth (feet)2 1 0 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 40HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 62R: Storm Sewer 4 Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,817.06 0.00 5.60 0.00 0 6,817.06 0.00 6.20 0.00 0 6,817.06 0.00 6.80 0.00 0 6,817.06 0.00 7.40 0.00 0 6,817.06 0.00 8.00 0.00 0 6,817.06 0.00 8.60 0.00 0 6,817.06 0.00 9.20 0.00 0 6,817.06 0.00 9.80 0.00 0 6,817.06 0.00 10.40 0.00 0 6,817.06 0.00 11.00 0.00 0 6,817.06 0.00 11.60 0.03 2 6,817.10 0.02 12.20 1.93 34 6,817.42 1.94 12.80 0.46 13 6,817.24 0.47 13.40 0.25 8 6,817.20 0.25 14.00 0.19 7 6,817.18 0.19 14.60 0.15 6 6,817.17 0.15 15.20 0.14 5 6,817.16 0.14 15.80 0.12 5 6,817.16 0.12 16.40 0.10 4 6,817.15 0.10 17.00 0.10 4 6,817.15 0.10 17.60 0.09 4 6,817.14 0.09 18.20 0.09 4 6,817.14 0.09 18.80 0.08 4 6,817.14 0.08 19.40 0.07 3 6,817.14 0.07 20.00 0.07 3 6,817.13 0.07 20.60 0.06 3 6,817.13 0.06 21.20 0.06 3 6,817.13 0.06 21.80 0.06 3 6,817.13 0.06 22.40 0.06 3 6,817.13 0.06 23.00 0.06 3 6,817.13 0.06 23.60 0.06 3 6,817.13 0.06 24.20 0.05 3 6,817.12 0.05 24.80 0.00 1 6,817.08 0.00 25.40 0.00 0 6,817.06 0.00 26.00 0.00 0 6,817.06 0.00 26.60 0.00 0 6,817.06 0.00 27.20 0.00 0 6,817.06 0.00 27.80 0.00 0 6,817.06 0.00 28.40 0.00 0 6,817.06 0.00 29.00 0.00 0 6,817.06 0.00 29.60 0.00 0 6,817.06 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 41HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 62R: Storm Sewer 4 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,817.06 0.00 0.00 6,817.08 0.77 0.00 6,817.10 1.21 0.02 6,817.12 1.58 0.04 6,817.14 1.91 0.08 6,817.16 2.21 0.13 6,817.18 2.49 0.19 6,817.20 2.75 0.27 6,817.22 2.99 0.35 6,817.24 3.23 0.45 6,817.26 3.45 0.56 6,817.28 3.66 0.69 6,817.30 3.87 0.83 6,817.32 4.07 0.98 6,817.34 4.26 1.14 6,817.36 4.44 1.31 6,817.38 4.62 1.50 6,817.40 4.80 1.70 6,817.42 4.97 1.91 6,817.44 5.13 2.13 6,817.46 5.29 2.37 6,817.48 5.45 2.61 6,817.50 5.60 2.87 6,817.52 5.74 3.14 6,817.54 5.89 3.41 6,817.56 6.03 3.70 6,817.58 6.16 4.00 6,817.60 6.30 4.31 6,817.62 6.43 4.63 6,817.64 6.55 4.95 6,817.66 6.68 5.29 6,817.68 6.80 5.64 6,817.70 6.91 5.99 6,817.72 7.03 6.35 6,817.74 7.14 6.73 6,817.76 7.25 7.10 6,817.78 7.36 7.49 6,817.80 7.46 7.88 6,817.82 7.56 8.29 6,817.84 7.66 8.69 6,817.86 7.76 9.11 6,817.88 7.85 9.52 6,817.90 7.95 9.95 6,817.92 8.04 10.38 6,817.94 8.12 10.82 6,817.96 8.21 11.25 6,817.98 8.29 11.70 6,818.00 8.37 12.15 6,818.02 8.45 12.60 6,818.04 8.53 13.05 6,818.06 8.60 13.51 6,818.08 8.67 13.97 6,818.10 8.74 14.43 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,818.12 8.81 14.90 6,818.14 8.88 15.36 6,818.16 8.94 15.83 6,818.18 9.00 16.29 6,818.20 9.06 16.76 6,818.22 9.12 17.22 6,818.24 9.17 17.69 6,818.26 9.22 18.15 6,818.28 9.27 18.62 6,818.30 9.32 19.08 6,818.32 9.37 19.53 6,818.34 9.41 19.99 6,818.36 9.46 20.44 6,818.38 9.49 20.89 6,818.40 9.53 21.33 6,818.42 9.57 21.77 6,818.44 9.60 22.20 6,818.46 9.63 22.62 6,818.48 9.66 23.04 6,818.50 9.69 23.45 6,818.52 9.71 23.86 6,818.54 9.73 24.25 6,818.56 9.75 24.64 6,818.58 9.77 25.02 6,818.60 9.78 25.38 6,818.62 9.79 25.74 6,818.64 9.80 26.08 6,818.66 9.80 26.41 6,818.68 9.81 26.73 6,818.70 9.80 27.03 6,818.72 9.80 27.32 6,818.74 9.79 27.59 6,818.76 9.78 27.84 6,818.78 9.77 28.08 6,818.80 9.75 28.29 6,818.82 9.73 28.49 6,818.84 9.70 28.65 6,818.86 9.67 28.80 6,818.88 9.63 28.91 6,818.90 9.59 29.00 6,818.92 9.54 29.05 6,818.94 9.48 29.07 6,818.96 9.42 29.03 6,818.98 9.34 28.95 6,819.00 9.25 28.80 6,819.02 9.13 28.55 6,819.04 8.98 28.15 6,819.06 8.60 27.02 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 42HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 62R: Storm Sewer 4 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,817.06 0.0 0 6,817.08 0.0 0 6,817.10 0.0 1 6,817.12 0.0 2 6,817.14 0.0 4 6,817.16 0.1 5 6,817.18 0.1 7 6,817.20 0.1 8 6,817.22 0.1 10 6,817.24 0.1 12 6,817.26 0.2 14 6,817.28 0.2 16 6,817.30 0.2 19 6,817.32 0.2 21 6,817.34 0.3 23 6,817.36 0.3 26 6,817.38 0.3 28 6,817.40 0.4 31 6,817.42 0.4 34 6,817.44 0.4 36 6,817.46 0.4 39 6,817.48 0.5 42 6,817.50 0.5 45 6,817.52 0.5 48 6,817.54 0.6 51 6,817.56 0.6 54 6,817.58 0.6 57 6,817.60 0.7 60 6,817.62 0.7 63 6,817.64 0.8 66 6,817.66 0.8 69 6,817.68 0.8 72 6,817.70 0.9 76 6,817.72 0.9 79 6,817.74 0.9 82 6,817.76 1.0 85 6,817.78 1.0 89 6,817.80 1.1 92 6,817.82 1.1 96 6,817.84 1.1 99 6,817.86 1.2 102 6,817.88 1.2 106 6,817.90 1.3 109 6,817.92 1.3 113 6,817.94 1.3 116 6,817.96 1.4 120 6,817.98 1.4 123 6,818.00 1.5 127 6,818.02 1.5 130 6,818.04 1.5 133 6,818.06 1.6 137 6,818.08 1.6 140 6,818.10 1.7 144 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,818.12 1.7 147 6,818.14 1.7 151 6,818.16 1.8 154 6,818.18 1.8 158 6,818.20 1.8 161 6,818.22 1.9 165 6,818.24 1.9 168 6,818.26 2.0 172 6,818.28 2.0 175 6,818.30 2.0 178 6,818.32 2.1 182 6,818.34 2.1 185 6,818.36 2.2 188 6,818.38 2.2 192 6,818.40 2.2 195 6,818.42 2.3 198 6,818.44 2.3 202 6,818.46 2.3 205 6,818.48 2.4 208 6,818.50 2.4 211 6,818.52 2.5 214 6,818.54 2.5 217 6,818.56 2.5 220 6,818.58 2.6 223 6,818.60 2.6 226 6,818.62 2.6 229 6,818.64 2.7 232 6,818.66 2.7 235 6,818.68 2.7 238 6,818.70 2.8 240 6,818.72 2.8 243 6,818.74 2.8 246 6,818.76 2.8 248 6,818.78 2.9 251 6,818.80 2.9 253 6,818.82 2.9 255 6,818.84 3.0 258 6,818.86 3.0 260 6,818.88 3.0 262 6,818.90 3.0 264 6,818.92 3.0 266 6,818.94 3.1 267 6,818.96 3.1 269 6,818.98 3.1 270 6,819.00 3.1 272 6,819.02 3.1 273 6,819.04 3.1 273 6,819.06 3.1 274 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 43HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Pond 41P: POST-AREA-10-CULVERT [57] Hint: Peaked at 6,882.15' (Flood elevation advised) Inflow Area = 2.069 ac, 12.55% Impervious, Inflow Depth = 0.55" for 25-YR event Inflow = 0.96 cfs @ 12.21 hrs, Volume= 0.094 af Outflow = 0.96 cfs @ 12.21 hrs, Volume= 0.094 af, Atten= 0%, Lag= 0.0 min Primary = 0.44 cfs @ 12.21 hrs, Volume= 0.081 af Secondary = 0.53 cfs @ 12.21 hrs, Volume= 0.013 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Peak Elev= 6,882.15' @ 12.21 hrs Device Routing Invert Outlet Devices #1 Primary 6,881.48'12.0" Round Culvert w/ 9.0" inside fill L= 38.8' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 6,880.73' / 6,879.51' S= 0.0314 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 0.15 sf #2 Secondary 6,882.03'Asymmetrical Weir, C= 3.27 Offset (feet) 0.00 49.91 60.67 72.06 82.74 Height (feet) 1.24 0.00 0.23 0.82 1.24 Primary OutFlow Max=0.44 cfs @ 12.21 hrs HW=6,882.15' TW=6,879.17' (Dynamic Tailwater) 1=Culvert (Inlet Controls 0.44 cfs @ 2.85 fps) Secondary OutFlow Max=0.52 cfs @ 12.21 hrs HW=6,882.15' TW=6,862.60' (Dynamic Tailwater) 2=Asymmetrical Weir (Weir Controls 0.52 cfs @ 0.45 fps) Pond 41P: POST-AREA-10-CULVERT Inflow Outflow Primary Secondary Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Inflow Area=2.069 ac Peak Elev=6,882.15' 0.96 cfs0.96 cfs 0.44 cfs0.53 cfs Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 44HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Pond 41P: POST-AREA-10-CULVERT Total Primary Secondary Stage-Discharge Discharge (cfs) 140120100806040200Elevation (feet)6,883 6,882 Culvert Asymmetrical Weir Pond 41P: POST-AREA-10-CULVERT Storage Stage-Area-Storage Storage (acre-feet) 0Elevation (feet)6,883 6,882 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 45HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Pond 41P: POST-AREA-10-CULVERT Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) Primary (cfs) Secondary (cfs) 5.00 0.00 6,881.48 0.00 0.00 0.00 5.60 0.00 6,881.48 0.00 0.00 0.00 6.20 0.00 6,881.48 0.00 0.00 0.00 6.80 0.00 6,881.48 0.00 0.00 0.00 7.40 0.00 6,881.48 0.00 0.00 0.00 8.00 0.00 6,881.48 0.00 0.00 0.00 8.60 0.00 6,881.48 0.00 0.00 0.00 9.20 0.00 6,881.48 0.00 0.00 0.00 9.80 0.00 6,881.48 0.00 0.00 0.00 10.40 0.00 6,881.48 0.00 0.00 0.00 11.00 0.00 6,881.48 0.00 0.00 0.00 11.60 0.01 6,881.51 0.01 0.01 0.00 12.20 0.96 6,882.15 0.96 0.44 0.52 12.80 0.24 6,881.77 0.24 0.24 0.00 13.40 0.13 6,881.64 0.13 0.13 0.00 14.00 0.09 6,881.61 0.09 0.09 0.00 14.60 0.08 6,881.59 0.08 0.08 0.00 15.20 0.07 6,881.58 0.07 0.07 0.00 15.80 0.06 6,881.58 0.06 0.06 0.00 16.40 0.05 6,881.57 0.05 0.05 0.00 17.00 0.05 6,881.56 0.05 0.05 0.00 17.60 0.05 6,881.56 0.05 0.05 0.00 18.20 0.04 6,881.56 0.04 0.04 0.00 18.80 0.04 6,881.55 0.04 0.04 0.00 19.40 0.04 6,881.55 0.04 0.04 0.00 20.00 0.03 6,881.54 0.03 0.03 0.00 20.60 0.03 6,881.54 0.03 0.03 0.00 21.20 0.03 6,881.54 0.03 0.03 0.00 21.80 0.03 6,881.54 0.03 0.03 0.00 22.40 0.03 6,881.54 0.03 0.03 0.00 23.00 0.03 6,881.54 0.03 0.03 0.00 23.60 0.03 6,881.54 0.03 0.03 0.00 24.20 0.02 6,881.53 0.02 0.02 0.00 24.80 0.00 6,881.49 0.00 0.00 0.00 25.40 0.00 6,881.48 0.00 0.00 0.00 26.00 0.00 6,881.48 0.00 0.00 0.00 26.60 0.00 6,881.48 0.00 0.00 0.00 27.20 0.00 6,881.48 0.00 0.00 0.00 27.80 0.00 6,881.48 0.00 0.00 0.00 28.40 0.00 6,881.48 0.00 0.00 0.00 29.00 0.00 6,881.48 0.00 0.00 0.00 29.60 0.00 6,881.48 0.00 0.00 0.00 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 46HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Pond 41P: POST-AREA-10-CULVERT Elevation (feet) Discharge (cfs) Primary (cfs) Secondary (cfs) 6,881.48 0.00 0.00 0.00 6,881.50 0.01 0.01 0.00 6,881.52 0.02 0.02 0.00 6,881.54 0.03 0.03 0.00 6,881.56 0.05 0.05 0.00 6,881.58 0.07 0.07 0.00 6,881.60 0.08 0.08 0.00 6,881.62 0.10 0.10 0.00 6,881.64 0.13 0.13 0.00 6,881.66 0.15 0.15 0.00 6,881.68 0.17 0.17 0.00 6,881.70 0.19 0.19 0.00 6,881.72 0.21 0.21 0.00 6,881.74 0.23 0.23 0.00 6,881.76 0.24 0.24 0.00 6,881.78 0.26 0.26 0.00 6,881.80 0.27 0.27 0.00 6,881.82 0.28 0.28 0.00 6,881.84 0.29 0.29 0.00 6,881.86 0.31 0.31 0.00 6,881.88 0.32 0.32 0.00 6,881.90 0.33 0.33 0.00 6,881.92 0.34 0.34 0.00 6,881.94 0.35 0.35 0.00 6,881.96 0.36 0.36 0.00 6,881.98 0.37 0.37 0.00 6,882.00 0.38 0.38 0.00 6,882.02 0.38 0.38 0.00 6,882.04 0.39 0.39 0.00 6,882.06 0.42 0.40 0.02 6,882.08 0.47 0.41 0.06 6,882.10 0.57 0.42 0.15 6,882.12 0.70 0.43 0.28 6,882.14 0.89 0.44 0.46 6,882.16 1.14 0.44 0.69 6,882.18 1.44 0.45 0.99 6,882.20 1.81 0.46 1.36 6,882.22 2.26 0.47 1.79 6,882.24 2.77 0.47 2.30 6,882.26 3.37 0.48 2.89 6,882.28 4.04 0.49 3.56 6,882.30 4.79 0.49 4.30 6,882.32 5.62 0.50 5.12 6,882.34 6.53 0.51 6.03 6,882.36 7.52 0.51 7.01 6,882.38 8.59 0.52 8.07 6,882.40 9.74 0.53 9.22 6,882.42 10.98 0.53 10.45 6,882.44 12.30 0.54 11.76 6,882.46 13.71 0.55 13.16 6,882.48 15.20 0.55 14.65 6,882.50 16.78 0.56 16.23 6,882.52 18.46 0.56 17.89 Elevation (feet) Discharge (cfs) Primary (cfs) Secondary (cfs) 6,882.54 20.23 0.57 19.65 6,882.56 22.08 0.58 21.51 6,882.58 24.04 0.58 23.46 6,882.60 26.09 0.59 25.50 6,882.62 28.24 0.59 27.64 6,882.64 30.48 0.60 29.88 6,882.66 32.83 0.61 32.23 6,882.68 35.28 0.61 34.67 6,882.70 37.83 0.62 37.21 6,882.72 40.48 0.62 39.86 6,882.74 43.24 0.63 42.62 6,882.76 46.11 0.63 45.48 6,882.78 49.09 0.64 48.45 6,882.80 52.17 0.64 51.53 6,882.82 55.36 0.65 54.71 6,882.84 58.67 0.65 58.01 6,882.86 62.08 0.66 61.43 6,882.88 65.62 0.66 64.95 6,882.90 69.27 0.67 68.60 6,882.92 73.03 0.67 72.36 6,882.94 76.92 0.68 76.24 6,882.96 80.93 0.68 80.25 6,882.98 85.07 0.69 84.38 6,883.00 89.33 0.69 88.63 6,883.02 93.71 0.70 93.01 6,883.04 98.22 0.70 97.52 6,883.06 102.87 0.71 102.16 6,883.08 107.64 0.71 106.93 6,883.10 112.54 0.72 111.83 6,883.12 117.58 0.72 116.86 6,883.14 122.76 0.73 122.03 6,883.16 128.06 0.73 127.33 6,883.18 133.51 0.74 132.77 6,883.20 139.09 0.74 138.35 6,883.22 144.82 0.75 144.07 6,883.24 150.68 0.75 149.93 6,883.26 156.69 0.76 155.93 Type II 24-hr 25-YR Rainfall=2.21", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 47HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 41P: POST-AREA-10-CULVERT Elevation (feet) Storage (acre-feet) 6,881.48 0.000 6,881.50 0.000 6,881.52 0.000 6,881.54 0.000 6,881.56 0.000 6,881.58 0.000 6,881.60 0.000 6,881.62 0.000 6,881.64 0.000 6,881.66 0.000 6,881.68 0.000 6,881.70 0.000 6,881.72 0.000 6,881.74 0.000 6,881.76 0.000 6,881.78 0.000 6,881.80 0.000 6,881.82 0.000 6,881.84 0.000 6,881.86 0.000 6,881.88 0.000 6,881.90 0.000 6,881.92 0.000 6,881.94 0.000 6,881.96 0.000 6,881.98 0.000 6,882.00 0.000 6,882.02 0.000 6,882.04 0.000 6,882.06 0.000 6,882.08 0.000 6,882.10 0.000 6,882.12 0.000 6,882.14 0.000 6,882.16 0.000 6,882.18 0.000 6,882.20 0.000 6,882.22 0.000 6,882.24 0.000 6,882.26 0.000 6,882.28 0.000 6,882.30 0.000 6,882.32 0.000 6,882.34 0.000 6,882.36 0.000 6,882.38 0.000 6,882.40 0.000 6,882.42 0.000 6,882.44 0.000 6,882.46 0.000 6,882.48 0.000 6,882.50 0.000 6,882.52 0.000 Elevation (feet) Storage (acre-feet) 6,882.54 0.000 6,882.56 0.000 6,882.58 0.000 6,882.60 0.000 6,882.62 0.000 6,882.64 0.000 6,882.66 0.000 6,882.68 0.000 6,882.70 0.000 6,882.72 0.000 6,882.74 0.000 6,882.76 0.000 6,882.78 0.000 6,882.80 0.000 6,882.82 0.000 6,882.84 0.000 6,882.86 0.000 6,882.88 0.000 6,882.90 0.000 6,882.92 0.000 6,882.94 0.000 6,882.96 0.000 6,882.98 0.000 6,883.00 0.000 6,883.02 0.000 6,883.04 0.000 6,883.06 0.000 6,883.08 0.000 6,883.10 0.000 6,883.12 0.000 6,883.14 0.000 6,883.16 0.000 6,883.18 0.000 6,883.20 0.000 6,883.22 0.000 6,883.24 0.000 6,883.26 0.000 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 48HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Time span=5.00-30.00 hrs, dt=0.03 hrs, 834 points x 3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2.069 ac 12.55% Impervious Runoff Depth=0.90"Subcatchment 40S: POST-AREA-10 Flow Length=473' Tc=25.6 min CN=74 Runoff=1.68 cfs 0.155 af Runoff Area=1.948 ac 24.45% Impervious Runoff Depth=0.95"Subcatchment 42S: POST-AREA-03 Flow Length=919' Tc=18.2 min CN=75 Runoff=2.06 cfs 0.153 af Avg. Flow Depth=0.20' Max Vel=4.22 fps Inflow=0.46 cfs 0.115 afReach 43R: POST-CULVERT-10A 12.0" Round Pipe n=0.012 L=81.4' S=0.0200 '/' Capacity=5.46 cfs Outflow=0.46 cfs 0.115 af Avg. Flow Depth=0.04' Max Vel=2.34 fps Inflow=0.46 cfs 0.115 afReach 44R: POST-Reach-10B n=0.030 L=91.5' S=0.1635 '/' Capacity=42.19 cfs Outflow=0.46 cfs 0.115 af Avg. Flow Depth=0.26' Max Vel=3.46 fps Inflow=1.68 cfs 0.155 afReach 45R: POST-Reach-10C n=0.030 L=555.8' S=0.0748 '/' Capacity=57.23 cfs Outflow=1.65 cfs 0.155 af Avg. Flow Depth=0.17' Max Vel=3.40 fps Inflow=3.42 cfs 0.309 afReach 48R: POST-Reach 03C n=0.035 L=92.4' S=0.0937 '/' Capacity=27.38 cfs Outflow=3.42 cfs 0.309 af Avg. Flow Depth=0.36' Max Vel=3.92 fps Inflow=3.42 cfs 0.309 afReach 50R: POST-Reach-03B n=0.030 L=92.2' S=0.0639 '/' Capacity=52.88 cfs Outflow=3.42 cfs 0.309 af Avg. Flow Depth=0.48' Max Vel=5.89 fps Inflow=3.42 cfs 0.309 afReach 62R: Storm Sewer 4 24.0" Round Pipe n=0.012 L=87.2' S=0.0122 '/' Capacity=27.02 cfs Outflow=3.42 cfs 0.309 af Peak Elev=6,882.19' Inflow=1.68 cfs 0.155 afPond 41P: POST-AREA-10-CULVERT Primary=0.46 cfs 0.115 af Secondary=1.22 cfs 0.040 af Outflow=1.68 cfs 0.155 af Total Runoff Area = 4.017 ac Runoff Volume = 0.309 af Average Runoff Depth = 0.92" 81.68% Pervious = 3.281 ac 18.32% Impervious = 0.736 ac Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 49HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 40S: POST-AREA-10 [47] Hint: Peak is 2400% of capacity of segment #3 [47] Hint: Peak is 1069% of capacity of segment #4 [47] Hint: Peak is 365% of capacity of segment #5 Runoff = 1.68 cfs @ 12.21 hrs, Volume= 0.155 af, Depth= 0.90" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.15 Area (ac) CN Description 0.592 81 1/3 acre lots, 30% imp, HSG C 0.986 71 Meadow, non-grazed, HSG C 0.304 57 Oak/aspen range, Fair, HSG C 0.105 87 Dirt roads, HSG C 0.082 98 Paved parking, HSG C 2.069 74 Weighted Average 1.809 87.45% Pervious Area 0.260 12.55% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 22.9 200 0.2046 0.15 Sheet Flow, Oak Brush - Meadow Woods: Light underbrush n= 0.400 P2= 1.33" 0.3 45 0.3536 2.97 Shallow Concentrated Flow, Oak Brush - Meadow Woodland Kv= 5.0 fps 1.1 64 0.0144 1.00 0.07 Trap/Vee/Rect Channel Flow, Old Irrigation Ditch Bot.W=0.00' D=0.20' Z= 1.9 & 1.6 '/' Top.W=0.70' n= 0.035 Earth, dense weeds 0.7 64 0.2359 1.57 0.16 Trap/Vee/Rect Channel Flow, Slope through Oak Brush - Meado Bot.W=4.00' D=0.02' Z= 50.0 '/' Top.W=6.00' n= 0.030 Earth, grassed & winding 0.6 100 0.0624 2.94 0.46 Trap/Vee/Rect Channel Flow, Roadside Ditch Bot.W=0.00' D=0.25' Z= 2.5 '/' Top.W=1.25' n= 0.030 Earth, grassed & winding 25.6 473 Total Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 50HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Subcatchment 40S: POST-AREA-10 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Type II 24-hr 100-YR Rainfall=2.81" Ia/S=0.15 Runoff Area=2.069 ac Runoff Volume=0.155 af Runoff Depth=0.90" Flow Length=473' Tc=25.6 min CN=74 1.68 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 51HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 40S: POST-AREA-10 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.18 0.00 0.00 5.30 0.19 0.00 0.00 5.60 0.21 0.00 0.00 5.90 0.22 0.00 0.00 6.20 0.24 0.00 0.00 6.50 0.25 0.00 0.00 6.80 0.27 0.00 0.00 7.10 0.28 0.00 0.00 7.40 0.30 0.00 0.00 7.70 0.32 0.00 0.00 8.00 0.34 0.00 0.00 8.30 0.36 0.00 0.00 8.60 0.38 0.00 0.00 8.90 0.40 0.00 0.00 9.20 0.43 0.00 0.00 9.50 0.46 0.00 0.00 9.80 0.49 0.00 0.00 10.10 0.52 0.00 0.00 10.40 0.56 0.00 0.00 10.70 0.60 0.00 0.00 11.00 0.66 0.00 0.01 11.30 0.73 0.01 0.03 11.60 0.86 0.03 0.06 11.90 1.60 0.25 0.34 12.20 1.96 0.42 1.68 12.50 2.07 0.47 0.80 12.80 2.13 0.50 0.39 13.10 2.19 0.53 0.26 13.40 2.23 0.56 0.20 13.70 2.27 0.58 0.17 14.00 2.30 0.60 0.15 14.30 2.33 0.61 0.13 14.60 2.36 0.63 0.12 14.90 2.39 0.65 0.11 15.20 2.41 0.66 0.11 15.50 2.44 0.67 0.10 15.80 2.46 0.69 0.09 16.10 2.48 0.70 0.09 16.40 2.50 0.71 0.08 16.70 2.52 0.72 0.08 17.00 2.53 0.73 0.07 17.30 2.55 0.74 0.07 17.60 2.57 0.75 0.07 17.90 2.58 0.76 0.07 18.20 2.60 0.77 0.07 18.50 2.61 0.78 0.06 18.80 2.63 0.79 0.06 19.10 2.64 0.79 0.06 19.40 2.65 0.80 0.06 19.70 2.66 0.81 0.05 20.00 2.68 0.82 0.05 20.30 2.69 0.82 0.05 20.60 2.70 0.83 0.05 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.71 0.83 0.05 21.20 2.72 0.84 0.05 21.50 2.73 0.85 0.05 21.80 2.74 0.85 0.04 22.10 2.75 0.86 0.04 22.40 2.76 0.87 0.04 22.70 2.77 0.87 0.04 23.00 2.78 0.88 0.04 23.30 2.79 0.89 0.04 23.60 2.80 0.89 0.04 23.90 2.81 0.90 0.04 24.20 2.81 0.90 0.04 24.50 2.81 0.90 0.01 24.80 2.81 0.90 0.00 25.10 2.81 0.90 0.00 25.40 2.81 0.90 0.00 25.70 2.81 0.90 0.00 26.00 2.81 0.90 0.00 26.30 2.81 0.90 0.00 26.60 2.81 0.90 0.00 26.90 2.81 0.90 0.00 27.20 2.81 0.90 0.00 27.50 2.81 0.90 0.00 27.80 2.81 0.90 0.00 28.10 2.81 0.90 0.00 28.40 2.81 0.90 0.00 28.70 2.81 0.90 0.00 29.00 2.81 0.90 0.00 29.30 2.81 0.90 0.00 29.60 2.81 0.90 0.00 29.90 2.81 0.90 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 52HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment 42S: POST-AREA-03 Runoff = 2.06 cfs @ 12.12 hrs, Volume= 0.153 af, Depth= 0.95" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.15 Area (ac) CN Description 0.748 71 Meadow, non-grazed, HSG C 0.418 57 Oak/aspen range, Fair, HSG C 0.289 98 Paved parking, HSG C 0.493 83 1/4 acre lots, 38% imp, HSG C 1.948 75 Weighted Average 1.472 75.55% Pervious Area 0.476 24.45% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.4 228 0.0581 1.60 Sheet Flow, Driveway Pavement Smooth surfaces n= 0.011 P2= 1.33" 14.7 151 0.1275 0.17 Sheet Flow, Grass Meadow Grass: Dense n= 0.240 P2= 1.33" 1.1 540 0.0750 8.37 39.35 Trap/Vee/Rect Channel Flow, Roadside Ditch Bot.W=0.00' D=1.00' Z= 2.1 & 7.3 '/' Top.W=9.40' n= 0.030 Earth, grassed & winding 18.2 919 Total Subcatchment 42S: POST-AREA-03 Runoff Hydrograph Time (hours) 2826242220181614121086Flow (cfs)2 1 0 Type II 24-hr 100-YR Rainfall=2.81" Ia/S=0.15 Runoff Area=1.948 ac Runoff Volume=0.153 af Runoff Depth=0.95" Flow Length=919' Tc=18.2 min CN=75 2.06 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 53HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 42S: POST-AREA-03 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 5.00 0.18 0.00 0.00 5.30 0.19 0.00 0.00 5.60 0.21 0.00 0.00 5.90 0.22 0.00 0.00 6.20 0.24 0.00 0.00 6.50 0.25 0.00 0.00 6.80 0.27 0.00 0.00 7.10 0.28 0.00 0.00 7.40 0.30 0.00 0.00 7.70 0.32 0.00 0.00 8.00 0.34 0.00 0.00 8.30 0.36 0.00 0.00 8.60 0.38 0.00 0.00 8.90 0.40 0.00 0.00 9.20 0.43 0.00 0.00 9.50 0.46 0.00 0.00 9.80 0.49 0.00 0.00 10.10 0.52 0.00 0.00 10.40 0.56 0.00 0.00 10.70 0.60 0.00 0.01 11.00 0.66 0.01 0.02 11.30 0.73 0.02 0.04 11.60 0.86 0.04 0.08 11.90 1.60 0.27 0.63 12.20 1.96 0.45 1.73 12.50 2.07 0.50 0.54 12.80 2.13 0.54 0.29 13.10 2.19 0.57 0.22 13.40 2.23 0.59 0.18 13.70 2.27 0.61 0.15 14.00 2.30 0.63 0.14 14.30 2.33 0.65 0.12 14.60 2.36 0.67 0.11 14.90 2.39 0.68 0.11 15.20 2.41 0.70 0.10 15.50 2.44 0.71 0.09 15.80 2.46 0.73 0.09 16.10 2.48 0.74 0.08 16.40 2.50 0.75 0.08 16.70 2.52 0.76 0.07 17.00 2.53 0.77 0.07 17.30 2.55 0.78 0.07 17.60 2.57 0.79 0.07 17.90 2.58 0.80 0.06 18.20 2.60 0.81 0.06 18.50 2.61 0.82 0.06 18.80 2.63 0.83 0.06 19.10 2.64 0.84 0.06 19.40 2.65 0.84 0.05 19.70 2.66 0.85 0.05 20.00 2.68 0.86 0.05 20.30 2.69 0.87 0.05 20.60 2.70 0.87 0.05 Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 20.90 2.71 0.88 0.04 21.20 2.72 0.89 0.04 21.50 2.73 0.89 0.04 21.80 2.74 0.90 0.04 22.10 2.75 0.91 0.04 22.40 2.76 0.91 0.04 22.70 2.77 0.92 0.04 23.00 2.78 0.93 0.04 23.30 2.79 0.93 0.04 23.60 2.80 0.94 0.04 23.90 2.81 0.94 0.04 24.20 2.81 0.95 0.03 24.50 2.81 0.95 0.00 24.80 2.81 0.95 0.00 25.10 2.81 0.95 0.00 25.40 2.81 0.95 0.00 25.70 2.81 0.95 0.00 26.00 2.81 0.95 0.00 26.30 2.81 0.95 0.00 26.60 2.81 0.95 0.00 26.90 2.81 0.95 0.00 27.20 2.81 0.95 0.00 27.50 2.81 0.95 0.00 27.80 2.81 0.95 0.00 28.10 2.81 0.95 0.00 28.40 2.81 0.95 0.00 28.70 2.81 0.95 0.00 29.00 2.81 0.95 0.00 29.30 2.81 0.95 0.00 29.60 2.81 0.95 0.00 29.90 2.81 0.95 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 54HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 43R: POST-CULVERT-10A [52] Hint: Inlet/Outlet conditions not evaluated Inflow Area = 2.069 ac, 12.55% Impervious, Inflow Depth = 0.67" for 100-YR event Inflow = 0.46 cfs @ 12.21 hrs, Volume= 0.115 af Outflow = 0.46 cfs @ 12.21 hrs, Volume= 0.115 af, Atten= 0%, Lag= 0.2 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 4.22 fps, Min. Travel Time= 0.3 min Avg. Velocity = 2.36 fps, Avg. Travel Time= 0.6 min Peak Storage= 9 cf @ 12.21 hrs Average Depth at Peak Storage= 0.20' , Surface Width= 0.79' Bank-Full Depth= 1.00' Flow Area= 0.8 sf, Capacity= 5.46 cfs 12.0" Round Pipe n= 0.012 Corrugated PP, smooth interior Length= 81.4' Slope= 0.0200 '/' Inlet Invert= 6,878.98', Outlet Invert= 6,877.35' Reach 43R: POST-CULVERT-10A Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=2.069 ac Avg. Flow Depth=0.20' Max Vel=4.22 fps 12.0" Round Pipe n=0.012 L=81.4' S=0.0200 '/' Capacity=5.46 cfs 0.46 cfs0.46 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 55HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 43R: POST-CULVERT-10A Primary Stage-Discharge Discharge (cfs) 543210Depth (feet)1 0 Reach 43R: POST-CULVERT-10A Storage Stage-Storage Storage (cubic-feet) 605550454035302520151050Depth (feet)1 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 56HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 43R: POST-CULVERT-10A Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,878.98 0.00 5.60 0.00 0 6,878.98 0.00 6.20 0.00 0 6,878.98 0.00 6.80 0.00 0 6,878.98 0.00 7.40 0.00 0 6,878.98 0.00 8.00 0.00 0 6,878.98 0.00 8.60 0.00 0 6,878.98 0.00 9.20 0.00 0 6,878.98 0.00 9.80 0.00 0 6,878.98 0.00 10.40 0.00 0 6,878.98 0.00 11.00 0.01 1 6,879.01 0.01 11.60 0.06 2 6,879.05 0.05 12.20 0.46 9 6,879.18 0.46 12.80 0.39 8 6,879.16 0.39 13.40 0.20 5 6,879.11 0.20 14.00 0.15 4 6,879.09 0.15 14.60 0.12 3 6,879.08 0.12 15.20 0.11 3 6,879.08 0.11 15.80 0.09 3 6,879.07 0.09 16.40 0.08 3 6,879.06 0.08 17.00 0.07 2 6,879.06 0.07 17.60 0.07 2 6,879.06 0.07 18.20 0.07 2 6,879.06 0.07 18.80 0.06 2 6,879.05 0.06 19.40 0.06 2 6,879.05 0.06 20.00 0.05 2 6,879.05 0.05 20.60 0.05 2 6,879.05 0.05 21.20 0.05 2 6,879.04 0.05 21.80 0.04 2 6,879.04 0.04 22.40 0.04 2 6,879.04 0.04 23.00 0.04 2 6,879.04 0.04 23.60 0.04 2 6,879.04 0.04 24.20 0.04 2 6,879.04 0.04 24.80 0.00 0 6,878.99 0.00 25.40 0.00 0 6,878.98 0.00 26.00 0.00 0 6,878.98 0.00 26.60 0.00 0 6,878.98 0.00 27.20 0.00 0 6,878.98 0.00 27.80 0.00 0 6,878.98 0.00 28.40 0.00 0 6,878.98 0.00 29.00 0.00 0 6,878.98 0.00 29.60 0.00 0 6,878.98 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 57HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 43R: POST-CULVERT-10A Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,878.98 0.00 0.00 6,878.99 0.62 0.00 6,879.00 0.98 0.00 6,879.01 1.28 0.01 6,879.02 1.54 0.02 6,879.03 1.79 0.03 6,879.04 2.01 0.04 6,879.05 2.22 0.05 6,879.06 2.42 0.07 6,879.07 2.61 0.09 6,879.08 2.79 0.11 6,879.09 2.96 0.14 6,879.10 3.13 0.17 6,879.11 3.29 0.20 6,879.12 3.44 0.23 6,879.13 3.59 0.27 6,879.14 3.74 0.30 6,879.15 3.88 0.34 6,879.16 4.02 0.39 6,879.17 4.15 0.43 6,879.18 4.28 0.48 6,879.19 4.40 0.53 6,879.20 4.52 0.58 6,879.21 4.64 0.63 6,879.22 4.76 0.69 6,879.23 4.87 0.75 6,879.24 4.98 0.81 6,879.25 5.09 0.87 6,879.26 5.20 0.94 6,879.27 5.30 1.00 6,879.28 5.40 1.07 6,879.29 5.49 1.14 6,879.30 5.59 1.21 6,879.31 5.68 1.28 6,879.32 5.77 1.36 6,879.33 5.86 1.44 6,879.34 5.95 1.51 6,879.35 6.03 1.59 6,879.36 6.12 1.67 6,879.37 6.20 1.76 6,879.38 6.27 1.84 6,879.39 6.35 1.93 6,879.40 6.42 2.01 6,879.41 6.50 2.10 6,879.42 6.57 2.19 6,879.43 6.64 2.28 6,879.44 6.70 2.36 6,879.45 6.77 2.46 6,879.46 6.83 2.55 6,879.47 6.89 2.64 6,879.48 6.95 2.73 6,879.49 7.01 2.82 6,879.50 7.07 2.92 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,879.51 7.12 3.01 6,879.52 7.18 3.10 6,879.53 7.23 3.20 6,879.54 7.28 3.29 6,879.55 7.32 3.39 6,879.56 7.37 3.48 6,879.57 7.42 3.58 6,879.58 7.46 3.67 6,879.59 7.50 3.76 6,879.60 7.54 3.86 6,879.61 7.58 3.95 6,879.62 7.61 4.04 6,879.63 7.64 4.13 6,879.64 7.68 4.22 6,879.65 7.71 4.31 6,879.66 7.74 4.40 6,879.67 7.76 4.49 6,879.68 7.79 4.57 6,879.69 7.81 4.66 6,879.70 7.83 4.74 6,879.71 7.85 4.82 6,879.72 7.87 4.90 6,879.73 7.88 4.98 6,879.74 7.90 5.06 6,879.75 7.91 5.13 6,879.76 7.92 5.20 6,879.77 7.92 5.27 6,879.78 7.93 5.34 6,879.79 7.93 5.40 6,879.80 7.93 5.46 6,879.81 7.92 5.52 6,879.82 7.92 5.58 6,879.83 7.91 5.63 6,879.84 7.90 5.68 6,879.85 7.88 5.72 6,879.86 7.87 5.76 6,879.87 7.84 5.79 6,879.88 7.82 5.82 6,879.89 7.79 5.84 6,879.90 7.75 5.86 6,879.91 7.71 5.87 6,879.92 7.67 5.88 6,879.93 7.61 5.87 6,879.94 7.55 5.85 6,879.95 7.48 5.82 6,879.96 7.38 5.77 6,879.97 7.26 5.69 6,879.98 6.95 5.46 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 58HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 43R: POST-CULVERT-10A Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,878.98 0.0 0 6,878.99 0.0 0 6,879.00 0.0 0 6,879.01 0.0 1 6,879.02 0.0 1 6,879.03 0.0 1 6,879.04 0.0 2 6,879.05 0.0 2 6,879.06 0.0 2 6,879.07 0.0 3 6,879.08 0.0 3 6,879.09 0.0 4 6,879.10 0.1 4 6,879.11 0.1 5 6,879.12 0.1 5 6,879.13 0.1 6 6,879.14 0.1 7 6,879.15 0.1 7 6,879.16 0.1 8 6,879.17 0.1 8 6,879.18 0.1 9 6,879.19 0.1 10 6,879.20 0.1 10 6,879.21 0.1 11 6,879.22 0.1 12 6,879.23 0.2 12 6,879.24 0.2 13 6,879.25 0.2 14 6,879.26 0.2 15 6,879.27 0.2 15 6,879.28 0.2 16 6,879.29 0.2 17 6,879.30 0.2 18 6,879.31 0.2 18 6,879.32 0.2 19 6,879.33 0.2 20 6,879.34 0.3 21 6,879.35 0.3 22 6,879.36 0.3 22 6,879.37 0.3 23 6,879.38 0.3 24 6,879.39 0.3 25 6,879.40 0.3 25 6,879.41 0.3 26 6,879.42 0.3 27 6,879.43 0.3 28 6,879.44 0.4 29 6,879.45 0.4 30 6,879.46 0.4 30 6,879.47 0.4 31 6,879.48 0.4 32 6,879.49 0.4 33 6,879.50 0.4 34 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,879.51 0.4 34 6,879.52 0.4 35 6,879.53 0.4 36 6,879.54 0.5 37 6,879.55 0.5 38 6,879.56 0.5 38 6,879.57 0.5 39 6,879.58 0.5 40 6,879.59 0.5 41 6,879.60 0.5 42 6,879.61 0.5 42 6,879.62 0.5 43 6,879.63 0.5 44 6,879.64 0.5 45 6,879.65 0.6 46 6,879.66 0.6 46 6,879.67 0.6 47 6,879.68 0.6 48 6,879.69 0.6 49 6,879.70 0.6 49 6,879.71 0.6 50 6,879.72 0.6 51 6,879.73 0.6 51 6,879.74 0.6 52 6,879.75 0.6 53 6,879.76 0.7 54 6,879.77 0.7 54 6,879.78 0.7 55 6,879.79 0.7 55 6,879.80 0.7 56 6,879.81 0.7 57 6,879.82 0.7 57 6,879.83 0.7 58 6,879.84 0.7 58 6,879.85 0.7 59 6,879.86 0.7 60 6,879.87 0.7 60 6,879.88 0.7 61 6,879.89 0.8 61 6,879.90 0.8 62 6,879.91 0.8 62 6,879.92 0.8 62 6,879.93 0.8 63 6,879.94 0.8 63 6,879.95 0.8 63 6,879.96 0.8 64 6,879.97 0.8 64 6,879.98 0.8 64 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 59HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 44R: POST-Reach-10B [61] Hint: Exceeded Reach 43R outlet invert by 0.04' @ 12.23 hrs Inflow Area = 2.069 ac, 12.55% Impervious, Inflow Depth = 0.67" for 100-YR event Inflow = 0.46 cfs @ 12.21 hrs, Volume= 0.115 af Outflow = 0.46 cfs @ 12.22 hrs, Volume= 0.115 af, Atten= 0%, Lag= 0.7 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 2.34 fps, Min. Travel Time= 0.7 min Avg. Velocity = 1.18 fps, Avg. Travel Time= 1.3 min Peak Storage= 18 cf @ 12.22 hrs Average Depth at Peak Storage= 0.04' , Surface Width= 4.88' Bank-Full Depth= 0.50' Flow Area= 4.5 sf, Capacity= 42.19 cfs 4.00' x 0.50' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 10.0 '/' Top Width= 14.00' Length= 91.5' Slope= 0.1635 '/' Inlet Invert= 6,877.35', Outlet Invert= 6,862.39' ‡ Reach 44R: POST-Reach-10B Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=2.069 ac Avg. Flow Depth=0.04' Max Vel=2.34 fps n=0.030 L=91.5' S=0.1635 '/' Capacity=42.19 cfs 0.46 cfs0.46 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 60HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 44R: POST-Reach-10B Primary Stage-Discharge Discharge (cfs) 4035302520151050Depth (feet)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Reach 44R: POST-Reach-10B Storage Stage-Storage Storage (cubic-feet) 400350300250200150100500Depth (feet)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 61HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 44R: POST-Reach-10B Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,877.35 0.00 5.60 0.00 0 6,877.35 0.00 6.20 0.00 0 6,877.35 0.00 6.80 0.00 0 6,877.35 0.00 7.40 0.00 0 6,877.35 0.00 8.00 0.00 0 6,877.35 0.00 8.60 0.00 0 6,877.35 0.00 9.20 0.00 0 6,877.35 0.00 9.80 0.00 0 6,877.35 0.00 10.40 0.00 0 6,877.35 0.00 11.00 0.01 2 6,877.35 0.01 11.60 0.05 5 6,877.36 0.05 12.20 0.46 18 6,877.39 0.46 12.80 0.39 16 6,877.39 0.40 13.40 0.20 11 6,877.38 0.20 14.00 0.15 9 6,877.37 0.15 14.60 0.12 8 6,877.37 0.12 15.20 0.11 7 6,877.37 0.11 15.80 0.09 6 6,877.37 0.09 16.40 0.08 6 6,877.37 0.08 17.00 0.07 6 6,877.37 0.07 17.60 0.07 5 6,877.36 0.07 18.20 0.07 5 6,877.36 0.07 18.80 0.06 5 6,877.36 0.06 19.40 0.06 5 6,877.36 0.06 20.00 0.05 4 6,877.36 0.05 20.60 0.05 4 6,877.36 0.05 21.20 0.05 4 6,877.36 0.05 21.80 0.04 4 6,877.36 0.04 22.40 0.04 4 6,877.36 0.04 23.00 0.04 4 6,877.36 0.04 23.60 0.04 4 6,877.36 0.04 24.20 0.04 4 6,877.36 0.04 24.80 0.00 0 6,877.35 0.00 25.40 0.00 0 6,877.35 0.00 26.00 0.00 0 6,877.35 0.00 26.60 0.00 0 6,877.35 0.00 27.20 0.00 0 6,877.35 0.00 27.80 0.00 0 6,877.35 0.00 28.40 0.00 0 6,877.35 0.00 29.00 0.00 0 6,877.35 0.00 29.60 0.00 0 6,877.35 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 62HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 44R: POST-Reach-10B Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,877.35 0.00 0.00 6,877.36 0.91 0.04 6,877.37 1.43 0.12 6,877.38 1.85 0.24 6,877.39 2.21 0.39 6,877.40 2.53 0.57 6,877.41 2.83 0.78 6,877.42 3.10 1.02 6,877.43 3.35 1.29 6,877.44 3.59 1.58 6,877.45 3.82 1.91 6,877.46 4.03 2.26 6,877.47 4.24 2.64 6,877.48 4.43 3.06 6,877.49 4.62 3.50 6,877.50 4.81 3.97 6,877.51 4.98 4.47 6,877.52 5.16 5.00 6,877.53 5.32 5.56 6,877.54 5.49 6.15 6,877.55 5.64 6.77 6,877.56 5.80 7.43 6,877.57 5.95 8.12 6,877.58 6.10 8.84 6,877.59 6.24 9.59 6,877.60 6.39 10.38 6,877.61 6.53 11.20 6,877.62 6.66 12.05 6,877.63 6.80 12.94 6,877.64 6.93 13.87 6,877.65 7.06 14.83 6,877.66 7.19 15.83 6,877.67 7.32 16.86 6,877.68 7.44 17.93 6,877.69 7.57 19.04 6,877.70 7.69 20.18 6,877.71 7.81 21.37 6,877.72 7.93 22.59 6,877.73 8.05 23.85 6,877.74 8.16 25.15 6,877.75 8.28 26.49 6,877.76 8.39 27.88 6,877.77 8.51 29.30 6,877.78 8.62 30.76 6,877.79 8.73 32.27 6,877.80 8.84 33.81 6,877.81 8.95 35.40 6,877.82 9.06 37.03 6,877.83 9.16 38.71 6,877.84 9.27 40.43 6,877.85 9.38 42.19 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 63HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 44R: POST-Reach-10B Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,877.35 0.0 0 6,877.36 0.0 4 6,877.37 0.1 8 6,877.38 0.1 12 6,877.39 0.2 16 6,877.40 0.2 21 6,877.41 0.3 25 6,877.42 0.3 30 6,877.43 0.4 35 6,877.44 0.4 40 6,877.45 0.5 46 6,877.46 0.6 51 6,877.47 0.6 57 6,877.48 0.7 63 6,877.49 0.8 69 6,877.50 0.8 75 6,877.51 0.9 82 6,877.52 1.0 89 6,877.53 1.0 96 6,877.54 1.1 103 6,877.55 1.2 110 6,877.56 1.3 117 6,877.57 1.4 125 6,877.58 1.4 133 6,877.59 1.5 141 6,877.60 1.6 149 6,877.61 1.7 157 6,877.62 1.8 166 6,877.63 1.9 174 6,877.64 2.0 183 6,877.65 2.1 192 6,877.66 2.2 201 6,877.67 2.3 211 6,877.68 2.4 220 6,877.69 2.5 230 6,877.70 2.6 240 6,877.71 2.7 250 6,877.72 2.8 261 6,877.73 3.0 271 6,877.74 3.1 282 6,877.75 3.2 293 6,877.76 3.3 304 6,877.77 3.4 315 6,877.78 3.6 327 6,877.79 3.7 338 6,877.80 3.8 350 6,877.81 4.0 362 6,877.82 4.1 374 6,877.83 4.2 386 6,877.84 4.4 399 6,877.85 4.5 412 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 64HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 45R: POST-Reach-10C [62] Hint: Exceeded Reach 44R OUTLET depth by 0.22' @ 12.23 hrs Inflow Area = 2.069 ac, 12.55% Impervious, Inflow Depth = 0.90" for 100-YR event Inflow = 1.68 cfs @ 12.21 hrs, Volume= 0.155 af Outflow = 1.65 cfs @ 12.24 hrs, Volume= 0.155 af, Atten= 2%, Lag= 2.2 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 3.46 fps, Min. Travel Time= 2.7 min Avg. Velocity = 1.50 fps, Avg. Travel Time= 6.2 min Peak Storage= 264 cf @ 12.24 hrs Average Depth at Peak Storage= 0.26' , Surface Width= 3.59' Bank-Full Depth= 1.00' Flow Area= 6.8 sf, Capacity= 57.23 cfs 0.00' x 1.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 1.9 11.7 '/' Top Width= 13.60' Length= 555.8' Slope= 0.0748 '/' Inlet Invert= 6,862.39', Outlet Invert= 6,820.81' ‡ Reach 45R: POST-Reach-10C Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Inflow Area=2.069 ac Avg. Flow Depth=0.26' Max Vel=3.46 fps n=0.030 L=555.8' S=0.0748 '/' Capacity=57.23 cfs 1.68 cfs 1.65 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 65HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 45R: POST-Reach-10C Primary Stage-Discharge Discharge (cfs) 5550454035302520151050Depth (feet)1 0 Reach 45R: POST-Reach-10C Storage Stage-Storage Storage (cubic-feet) 3,5003,0002,5002,0001,5001,0005000Depth (feet)1 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 66HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 45R: POST-Reach-10C Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,862.39 0.00 5.60 0.00 0 6,862.39 0.00 6.20 0.00 0 6,862.39 0.00 6.80 0.00 0 6,862.39 0.00 7.40 0.00 0 6,862.39 0.00 8.00 0.00 0 6,862.39 0.00 8.60 0.00 0 6,862.39 0.00 9.20 0.00 0 6,862.39 0.00 9.80 0.00 0 6,862.39 0.00 10.40 0.00 0 6,862.39 0.00 11.00 0.01 4 6,862.42 0.01 11.60 0.05 17 6,862.46 0.04 12.20 1.68 258 6,862.65 1.60 12.80 0.40 97 6,862.55 0.44 13.40 0.20 56 6,862.51 0.21 14.00 0.15 44 6,862.50 0.15 14.60 0.12 37 6,862.49 0.12 15.20 0.11 34 6,862.48 0.11 15.80 0.09 31 6,862.48 0.09 16.40 0.08 28 6,862.48 0.08 17.00 0.07 26 6,862.47 0.08 17.60 0.07 25 6,862.47 0.07 18.20 0.07 24 6,862.47 0.07 18.80 0.06 22 6,862.47 0.06 19.40 0.06 21 6,862.46 0.06 20.00 0.05 19 6,862.46 0.05 20.60 0.05 18 6,862.46 0.05 21.20 0.05 18 6,862.46 0.05 21.80 0.04 18 6,862.46 0.04 22.40 0.04 17 6,862.46 0.04 23.00 0.04 17 6,862.46 0.04 23.60 0.04 17 6,862.46 0.04 24.20 0.04 16 6,862.46 0.04 24.80 0.00 4 6,862.42 0.01 25.40 0.00 1 6,862.40 0.00 26.00 0.00 0 6,862.39 0.00 26.60 0.00 0 6,862.39 0.00 27.20 0.00 0 6,862.39 0.00 27.80 0.00 0 6,862.39 0.00 28.40 0.00 0 6,862.39 0.00 29.00 0.00 0 6,862.39 0.00 29.60 0.00 0 6,862.39 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 67HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 45R: POST-Reach-10C Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,862.39 0.00 0.00 6,862.40 0.39 0.00 6,862.41 0.62 0.00 6,862.42 0.81 0.00 6,862.43 0.98 0.01 6,862.44 1.14 0.02 6,862.45 1.29 0.03 6,862.46 1.43 0.05 6,862.47 1.56 0.07 6,862.48 1.69 0.09 6,862.49 1.81 0.12 6,862.50 1.93 0.16 6,862.51 2.05 0.20 6,862.52 2.16 0.25 6,862.53 2.27 0.30 6,862.54 2.38 0.36 6,862.55 2.48 0.43 6,862.56 2.58 0.51 6,862.57 2.68 0.59 6,862.58 2.78 0.68 6,862.59 2.88 0.78 6,862.60 2.97 0.89 6,862.61 3.07 1.01 6,862.62 3.16 1.14 6,862.63 3.25 1.27 6,862.64 3.34 1.42 6,862.65 3.43 1.58 6,862.66 3.52 1.74 6,862.67 3.60 1.92 6,862.68 3.69 2.11 6,862.69 3.77 2.31 6,862.70 3.85 2.52 6,862.71 3.94 2.74 6,862.72 4.02 2.98 6,862.73 4.10 3.22 6,862.74 4.18 3.48 6,862.75 4.26 3.75 6,862.76 4.34 4.04 6,862.77 4.42 4.34 6,862.78 4.49 4.65 6,862.79 4.57 4.97 6,862.80 4.64 5.31 6,862.81 4.72 5.66 6,862.82 4.79 6.03 6,862.83 4.87 6.41 6,862.84 4.94 6.81 6,862.85 5.01 7.22 6,862.86 5.09 7.64 6,862.87 5.16 8.08 6,862.88 5.23 8.54 6,862.89 5.30 9.01 6,862.90 5.37 9.50 6,862.91 5.44 10.01 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,862.92 5.51 10.53 6,862.93 5.58 11.07 6,862.94 5.65 11.62 6,862.95 5.72 12.19 6,862.96 5.79 12.78 6,862.97 5.85 13.39 6,862.98 5.92 14.01 6,862.99 5.99 14.66 6,863.00 6.05 15.32 6,863.01 6.12 15.99 6,863.02 6.18 16.69 6,863.03 6.25 17.41 6,863.04 6.31 18.14 6,863.05 6.38 18.90 6,863.06 6.44 19.67 6,863.07 6.51 20.46 6,863.08 6.57 21.27 6,863.09 6.63 22.11 6,863.10 6.70 22.96 6,863.11 6.76 23.83 6,863.12 6.82 24.72 6,863.13 6.89 25.64 6,863.14 6.95 26.57 6,863.15 7.01 27.53 6,863.16 7.07 28.50 6,863.17 7.13 29.50 6,863.18 7.19 30.52 6,863.19 7.25 31.56 6,863.20 7.31 32.63 6,863.21 7.37 33.71 6,863.22 7.43 34.82 6,863.23 7.49 35.95 6,863.24 7.55 37.10 6,863.25 7.61 38.28 6,863.26 7.67 39.47 6,863.27 7.73 40.70 6,863.28 7.79 41.94 6,863.29 7.84 43.21 6,863.30 7.90 44.50 6,863.31 7.96 45.82 6,863.32 8.02 47.16 6,863.33 8.08 48.52 6,863.34 8.13 49.91 6,863.35 8.19 51.32 6,863.36 8.25 52.76 6,863.37 8.30 54.23 6,863.38 8.36 55.71 6,863.39 8.42 57.23 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 68HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 45R: POST-Reach-10C Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,862.39 0.0 0 6,862.40 0.0 0 6,862.41 0.0 2 6,862.42 0.0 3 6,862.43 0.0 6 6,862.44 0.0 9 6,862.45 0.0 14 6,862.46 0.0 19 6,862.47 0.0 24 6,862.48 0.1 31 6,862.49 0.1 38 6,862.50 0.1 46 6,862.51 0.1 54 6,862.52 0.1 64 6,862.53 0.1 74 6,862.54 0.2 85 6,862.55 0.2 97 6,862.56 0.2 109 6,862.57 0.2 122 6,862.58 0.2 136 6,862.59 0.3 151 6,862.60 0.3 167 6,862.61 0.3 183 6,862.62 0.4 200 6,862.63 0.4 218 6,862.64 0.4 236 6,862.65 0.5 255 6,862.66 0.5 276 6,862.67 0.5 296 6,862.68 0.6 318 6,862.69 0.6 340 6,862.70 0.7 363 6,862.71 0.7 387 6,862.72 0.7 412 6,862.73 0.8 437 6,862.74 0.8 463 6,862.75 0.9 490 6,862.76 0.9 517 6,862.77 1.0 546 6,862.78 1.0 575 6,862.79 1.1 605 6,862.80 1.1 635 6,862.81 1.2 667 6,862.82 1.3 699 6,862.83 1.3 732 6,862.84 1.4 765 6,862.85 1.4 800 6,862.86 1.5 835 6,862.87 1.6 871 6,862.88 1.6 907 6,862.89 1.7 945 6,862.90 1.8 983 6,862.91 1.8 1,022 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,862.92 1.9 1,062 6,862.93 2.0 1,102 6,862.94 2.1 1,143 6,862.95 2.1 1,185 6,862.96 2.2 1,228 6,862.97 2.3 1,271 6,862.98 2.4 1,316 6,862.99 2.4 1,361 6,863.00 2.5 1,406 6,863.01 2.6 1,453 6,863.02 2.7 1,500 6,863.03 2.8 1,548 6,863.04 2.9 1,597 6,863.05 3.0 1,646 6,863.06 3.1 1,697 6,863.07 3.1 1,748 6,863.08 3.2 1,799 6,863.09 3.3 1,852 6,863.10 3.4 1,905 6,863.11 3.5 1,959 6,863.12 3.6 2,014 6,863.13 3.7 2,070 6,863.14 3.8 2,126 6,863.15 3.9 2,183 6,863.16 4.0 2,241 6,863.17 4.1 2,299 6,863.18 4.2 2,359 6,863.19 4.4 2,419 6,863.20 4.5 2,480 6,863.21 4.6 2,541 6,863.22 4.7 2,604 6,863.23 4.8 2,667 6,863.24 4.9 2,731 6,863.25 5.0 2,795 6,863.26 5.1 2,861 6,863.27 5.3 2,927 6,863.28 5.4 2,994 6,863.29 5.5 3,061 6,863.30 5.6 3,130 6,863.31 5.8 3,199 6,863.32 5.9 3,269 6,863.33 6.0 3,340 6,863.34 6.1 3,411 6,863.35 6.3 3,483 6,863.36 6.4 3,556 6,863.37 6.5 3,630 6,863.38 6.7 3,704 6,863.39 6.8 3,779 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 69HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 48R: POST-Reach 03C [61] Hint: Exceeded Reach 50R outlet invert by 0.17' @ 12.17 hrs Inflow Area = 4.017 ac, 18.32% Impervious, Inflow Depth = 0.92" for 100-YR event Inflow = 3.42 cfs @ 12.17 hrs, Volume= 0.309 af Outflow = 3.42 cfs @ 12.17 hrs, Volume= 0.309 af, Atten= 0%, Lag= 0.3 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 3.40 fps, Min. Travel Time= 0.5 min Avg. Velocity = 1.11 fps, Avg. Travel Time= 1.4 min Peak Storage= 93 cf @ 12.17 hrs Average Depth at Peak Storage= 0.17' , Surface Width= 7.50' Bank-Full Depth= 0.50' Flow Area= 4.5 sf, Capacity= 27.38 cfs 4.00' x 0.50' deep channel, n= 0.035 Earth, dense weeds Side Slope Z-value= 10.0 '/' Top Width= 14.00' Length= 92.4' Slope= 0.0937 '/' Inlet Invert= 6,810.65', Outlet Invert= 6,801.99' ‡ Reach 48R: POST-Reach 03C Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)3 2 1 0 Inflow Area=4.017 ac Avg. Flow Depth=0.17' Max Vel=3.40 fps n=0.035 L=92.4' S=0.0937 '/' Capacity=27.38 cfs 3.42 cfs3.42 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 70HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 48R: POST-Reach 03C Primary Stage-Discharge Discharge (cfs) 26242220181614121086420Depth (feet)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Reach 48R: POST-Reach 03C Storage Stage-Storage Storage (cubic-feet) 400350300250200150100500Depth (feet)0.5 0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 71HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 48R: POST-Reach 03C Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,810.65 0.00 5.60 0.00 0 6,810.65 0.00 6.20 0.00 0 6,810.65 0.00 6.80 0.00 0 6,810.65 0.00 7.40 0.00 0 6,810.65 0.00 8.00 0.00 0 6,810.65 0.00 8.60 0.00 0 6,810.65 0.00 9.20 0.00 0 6,810.65 0.00 9.80 0.00 0 6,810.65 0.00 10.40 0.00 0 6,810.65 0.00 11.00 0.03 4 6,810.66 0.02 11.60 0.11 10 6,810.67 0.11 12.20 3.36 92 6,810.82 3.38 12.80 0.74 33 6,810.73 0.75 13.40 0.39 22 6,810.70 0.39 14.00 0.29 18 6,810.69 0.29 14.60 0.23 15 6,810.69 0.23 15.20 0.21 14 6,810.69 0.21 15.80 0.18 13 6,810.68 0.18 16.40 0.16 12 6,810.68 0.16 17.00 0.15 12 6,810.68 0.15 17.60 0.14 11 6,810.68 0.14 18.20 0.13 11 6,810.68 0.13 18.80 0.12 10 6,810.68 0.12 19.40 0.11 10 6,810.67 0.11 20.00 0.10 9 6,810.67 0.10 20.60 0.09 9 6,810.67 0.09 21.20 0.09 8 6,810.67 0.09 21.80 0.09 8 6,810.67 0.09 22.40 0.09 8 6,810.67 0.09 23.00 0.08 8 6,810.67 0.08 23.60 0.08 8 6,810.67 0.08 24.20 0.07 7 6,810.67 0.07 24.80 0.01 2 6,810.66 0.01 25.40 0.00 0 6,810.65 0.00 26.00 0.00 0 6,810.65 0.00 26.60 0.00 0 6,810.65 0.00 27.20 0.00 0 6,810.65 0.00 27.80 0.00 0 6,810.65 0.00 28.40 0.00 0 6,810.65 0.00 29.00 0.00 0 6,810.65 0.00 29.60 0.00 0 6,810.65 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 72HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 48R: POST-Reach 03C Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,810.65 0.00 0.00 6,810.66 0.59 0.02 6,810.67 0.93 0.08 6,810.68 1.20 0.15 6,810.69 1.43 0.25 6,810.70 1.64 0.37 6,810.71 1.83 0.51 6,810.72 2.01 0.66 6,810.73 2.18 0.84 6,810.74 2.33 1.03 6,810.75 2.48 1.24 6,810.76 2.62 1.47 6,810.77 2.75 1.72 6,810.78 2.88 1.98 6,810.79 3.00 2.27 6,810.80 3.12 2.57 6,810.81 3.24 2.90 6,810.82 3.35 3.24 6,810.83 3.46 3.61 6,810.84 3.56 3.99 6,810.85 3.66 4.40 6,810.86 3.76 4.82 6,810.87 3.86 5.27 6,810.88 3.96 5.74 6,810.89 4.05 6.22 6,810.90 4.14 6.73 6,810.91 4.24 7.27 6,810.92 4.32 7.82 6,810.93 4.41 8.40 6,810.94 4.50 9.00 6,810.95 4.58 9.62 6,810.96 4.67 10.27 6,810.97 4.75 10.94 6,810.98 4.83 11.64 6,810.99 4.91 12.36 6,811.00 4.99 13.10 6,811.01 5.07 13.87 6,811.02 5.15 14.66 6,811.03 5.22 15.48 6,811.04 5.30 16.32 6,811.05 5.37 17.19 6,811.06 5.45 18.09 6,811.07 5.52 19.01 6,811.08 5.59 19.96 6,811.09 5.67 20.94 6,811.10 5.74 21.94 6,811.11 5.81 22.97 6,811.12 5.88 24.03 6,811.13 5.95 25.12 6,811.14 6.02 26.24 6,811.15 6.08 27.38 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 73HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 48R: POST-Reach 03C Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,810.65 0.0 0 6,810.66 0.0 4 6,810.67 0.1 8 6,810.68 0.1 12 6,810.69 0.2 16 6,810.70 0.2 21 6,810.71 0.3 26 6,810.72 0.3 30 6,810.73 0.4 35 6,810.74 0.4 41 6,810.75 0.5 46 6,810.76 0.6 52 6,810.77 0.6 58 6,810.78 0.7 64 6,810.79 0.8 70 6,810.80 0.8 76 6,810.81 0.9 83 6,810.82 1.0 90 6,810.83 1.0 96 6,810.84 1.1 104 6,810.85 1.2 111 6,810.86 1.3 118 6,810.87 1.4 126 6,810.88 1.4 134 6,810.89 1.5 142 6,810.90 1.6 150 6,810.91 1.7 159 6,810.92 1.8 167 6,810.93 1.9 176 6,810.94 2.0 185 6,810.95 2.1 194 6,810.96 2.2 203 6,810.97 2.3 213 6,810.98 2.4 223 6,810.99 2.5 232 6,811.00 2.6 243 6,811.01 2.7 253 6,811.02 2.8 263 6,811.03 3.0 274 6,811.04 3.1 285 6,811.05 3.2 296 6,811.06 3.3 307 6,811.07 3.4 318 6,811.08 3.6 330 6,811.09 3.7 342 6,811.10 3.8 353 6,811.11 4.0 366 6,811.12 4.1 378 6,811.13 4.2 390 6,811.14 4.4 403 6,811.15 4.5 416 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 74HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 50R: POST-Reach-03B [62] Hint: Exceeded Reach 62R OUTLET depth by 0.55' @ 25.19 hrs Inflow Area = 4.017 ac, 18.32% Impervious, Inflow Depth = 0.92" for 100-YR event Inflow = 3.42 cfs @ 12.16 hrs, Volume= 0.309 af Outflow = 3.42 cfs @ 12.17 hrs, Volume= 0.309 af, Atten= 0%, Lag= 0.3 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 3.92 fps, Min. Travel Time= 0.4 min Avg. Velocity = 1.65 fps, Avg. Travel Time= 0.9 min Peak Storage= 80 cf @ 12.17 hrs Average Depth at Peak Storage= 0.36' , Surface Width= 4.87' Bank-Full Depth= 1.00' Flow Area= 6.8 sf, Capacity= 52.88 cfs 0.00' x 1.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z-value= 1.9 11.7 '/' Top Width= 13.60' Length= 92.2' Slope= 0.0639 '/' Inlet Invert= 6,816.54', Outlet Invert= 6,810.65' ‡ Reach 50R: POST-Reach-03B Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)3 2 1 0 Inflow Area=4.017 ac Avg. Flow Depth=0.36' Max Vel=3.92 fps n=0.030 L=92.2' S=0.0639 '/' Capacity=52.88 cfs 3.42 cfs3.42 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 75HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 50R: POST-Reach-03B Primary Stage-Discharge Discharge (cfs) 50454035302520151050Depth (feet)1 0 Reach 50R: POST-Reach-03B Storage Stage-Storage Storage (cubic-feet) 600550500450400350300250200150100500Depth (feet)1 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 76HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 50R: POST-Reach-03B Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,816.54 0.00 5.60 0.00 0 6,816.54 0.00 6.20 0.00 0 6,816.54 0.00 6.80 0.00 0 6,816.54 0.00 7.40 0.00 0 6,816.54 0.00 8.00 0.00 0 6,816.54 0.00 8.60 0.00 0 6,816.54 0.00 9.20 0.00 0 6,816.54 0.00 9.80 0.00 0 6,816.54 0.00 10.40 0.00 0 6,816.56 0.00 11.00 0.03 2 6,816.60 0.03 11.60 0.12 6 6,816.64 0.11 12.20 3.34 79 6,816.90 3.36 12.80 0.73 25 6,816.74 0.74 13.40 0.39 16 6,816.70 0.39 14.00 0.29 13 6,816.68 0.29 14.60 0.23 11 6,816.67 0.23 15.20 0.21 10 6,816.67 0.21 15.80 0.18 9 6,816.66 0.18 16.40 0.16 8 6,816.65 0.16 17.00 0.15 8 6,816.65 0.15 17.60 0.14 7 6,816.65 0.14 18.20 0.13 7 6,816.64 0.13 18.80 0.12 6 6,816.64 0.12 19.40 0.11 6 6,816.64 0.11 20.00 0.10 6 6,816.63 0.10 20.60 0.09 5 6,816.63 0.09 21.20 0.09 5 6,816.63 0.09 21.80 0.09 5 6,816.63 0.09 22.40 0.09 5 6,816.63 0.09 23.00 0.08 5 6,816.63 0.08 23.60 0.08 5 6,816.63 0.08 24.20 0.07 4 6,816.62 0.07 24.80 0.01 1 6,816.57 0.01 25.40 0.00 0 6,816.55 0.00 26.00 0.00 0 6,816.54 0.00 26.60 0.00 0 6,816.54 0.00 27.20 0.00 0 6,816.54 0.00 27.80 0.00 0 6,816.54 0.00 28.40 0.00 0 6,816.54 0.00 29.00 0.00 0 6,816.54 0.00 29.60 0.00 0 6,816.54 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 77HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 50R: POST-Reach-03B Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,816.54 0.00 0.00 6,816.55 0.36 0.00 6,816.56 0.57 0.00 6,816.57 0.75 0.00 6,816.58 0.91 0.01 6,816.59 1.06 0.02 6,816.60 1.19 0.03 6,816.61 1.32 0.04 6,816.62 1.44 0.06 6,816.63 1.56 0.09 6,816.64 1.68 0.11 6,816.65 1.79 0.15 6,816.66 1.89 0.19 6,816.67 2.00 0.23 6,816.68 2.10 0.28 6,816.69 2.20 0.34 6,816.70 2.29 0.40 6,816.71 2.39 0.47 6,816.72 2.48 0.55 6,816.73 2.57 0.63 6,816.74 2.66 0.72 6,816.75 2.75 0.82 6,816.76 2.83 0.93 6,816.77 2.92 1.05 6,816.78 3.00 1.18 6,816.79 3.09 1.31 6,816.80 3.17 1.46 6,816.81 3.25 1.61 6,816.82 3.33 1.77 6,816.83 3.41 1.95 6,816.84 3.49 2.13 6,816.85 3.56 2.33 6,816.86 3.64 2.53 6,816.87 3.71 2.75 6,816.88 3.79 2.98 6,816.89 3.86 3.22 6,816.90 3.94 3.47 6,816.91 4.01 3.73 6,816.92 4.08 4.01 6,816.93 4.15 4.29 6,816.94 4.22 4.59 6,816.95 4.29 4.91 6,816.96 4.36 5.23 6,816.97 4.43 5.57 6,816.98 4.50 5.92 6,816.99 4.57 6.29 6,817.00 4.63 6.67 6,817.01 4.70 7.06 6,817.02 4.77 7.47 6,817.03 4.83 7.89 6,817.04 4.90 8.33 6,817.05 4.96 8.78 6,817.06 5.03 9.25 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,817.07 5.09 9.73 6,817.08 5.16 10.23 6,817.09 5.22 10.74 6,817.10 5.28 11.27 6,817.11 5.35 11.81 6,817.12 5.41 12.37 6,817.13 5.47 12.95 6,817.14 5.53 13.54 6,817.15 5.59 14.15 6,817.16 5.65 14.78 6,817.17 5.72 15.42 6,817.18 5.78 16.09 6,817.19 5.84 16.77 6,817.20 5.90 17.46 6,817.21 5.95 18.18 6,817.22 6.01 18.91 6,817.23 6.07 19.66 6,817.24 6.13 20.43 6,817.25 6.19 21.22 6,817.26 6.25 22.02 6,817.27 6.30 22.85 6,817.28 6.36 23.69 6,817.29 6.42 24.55 6,817.30 6.48 25.44 6,817.31 6.53 26.34 6,817.32 6.59 27.26 6,817.33 6.65 28.20 6,817.34 6.70 29.17 6,817.35 6.76 30.15 6,817.36 6.81 31.15 6,817.37 6.87 32.17 6,817.38 6.92 33.22 6,817.39 6.98 34.28 6,817.40 7.03 35.37 6,817.41 7.09 36.48 6,817.42 7.14 37.61 6,817.43 7.20 38.76 6,817.44 7.25 39.93 6,817.45 7.30 41.12 6,817.46 7.36 42.34 6,817.47 7.41 43.58 6,817.48 7.46 44.84 6,817.49 7.52 46.12 6,817.50 7.57 47.43 6,817.51 7.62 48.76 6,817.52 7.67 50.11 6,817.53 7.72 51.48 6,817.54 7.78 52.88 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 78HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 50R: POST-Reach-03B Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,816.54 0.0 0 6,816.55 0.0 0 6,816.56 0.0 0 6,816.57 0.0 1 6,816.58 0.0 1 6,816.59 0.0 2 6,816.60 0.0 2 6,816.61 0.0 3 6,816.62 0.0 4 6,816.63 0.1 5 6,816.64 0.1 6 6,816.65 0.1 8 6,816.66 0.1 9 6,816.67 0.1 11 6,816.68 0.1 12 6,816.69 0.2 14 6,816.70 0.2 16 6,816.71 0.2 18 6,816.72 0.2 20 6,816.73 0.2 23 6,816.74 0.3 25 6,816.75 0.3 28 6,816.76 0.3 30 6,816.77 0.4 33 6,816.78 0.4 36 6,816.79 0.4 39 6,816.80 0.5 42 6,816.81 0.5 46 6,816.82 0.5 49 6,816.83 0.6 53 6,816.84 0.6 56 6,816.85 0.7 60 6,816.86 0.7 64 6,816.87 0.7 68 6,816.88 0.8 72 6,816.89 0.8 77 6,816.90 0.9 81 6,816.91 0.9 86 6,816.92 1.0 91 6,816.93 1.0 95 6,816.94 1.1 100 6,816.95 1.1 105 6,816.96 1.2 111 6,816.97 1.3 116 6,816.98 1.3 121 6,816.99 1.4 127 6,817.00 1.4 133 6,817.01 1.5 138 6,817.02 1.6 144 6,817.03 1.6 151 6,817.04 1.7 157 6,817.05 1.8 163 6,817.06 1.8 170 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,817.07 1.9 176 6,817.08 2.0 183 6,817.09 2.1 190 6,817.10 2.1 197 6,817.11 2.2 204 6,817.12 2.3 211 6,817.13 2.4 218 6,817.14 2.4 226 6,817.15 2.5 233 6,817.16 2.6 241 6,817.17 2.7 249 6,817.18 2.8 257 6,817.19 2.9 265 6,817.20 3.0 273 6,817.21 3.1 281 6,817.22 3.1 290 6,817.23 3.2 298 6,817.24 3.3 307 6,817.25 3.4 316 6,817.26 3.5 325 6,817.27 3.6 334 6,817.28 3.7 343 6,817.29 3.8 353 6,817.30 3.9 362 6,817.31 4.0 372 6,817.32 4.1 381 6,817.33 4.2 391 6,817.34 4.4 401 6,817.35 4.5 411 6,817.36 4.6 422 6,817.37 4.7 432 6,817.38 4.8 442 6,817.39 4.9 453 6,817.40 5.0 464 6,817.41 5.1 475 6,817.42 5.3 486 6,817.43 5.4 497 6,817.44 5.5 508 6,817.45 5.6 519 6,817.46 5.8 531 6,817.47 5.9 542 6,817.48 6.0 554 6,817.49 6.1 566 6,817.50 6.3 578 6,817.51 6.4 590 6,817.52 6.5 602 6,817.53 6.7 614 6,817.54 6.8 627 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 79HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Reach 62R: Storm Sewer 4 [52] Hint: Inlet/Outlet conditions not evaluated Inflow Area = 4.017 ac, 18.32% Impervious, Inflow Depth = 0.92" for 100-YR event Inflow = 3.42 cfs @ 12.16 hrs, Volume= 0.309 af Outflow = 3.42 cfs @ 12.16 hrs, Volume= 0.309 af, Atten= 0%, Lag= 0.2 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Max. Velocity= 5.89 fps, Min. Travel Time= 0.2 min Avg. Velocity = 2.19 fps, Avg. Travel Time= 0.7 min Peak Storage= 51 cf @ 12.16 hrs Average Depth at Peak Storage= 0.48' , Surface Width= 1.71' Bank-Full Depth= 2.00' Flow Area= 3.1 sf, Capacity= 27.02 cfs 24.0" Round Pipe n= 0.012 Length= 87.2' Slope= 0.0122 '/' Inlet Invert= 6,817.06', Outlet Invert= 6,816.00' Reach 62R: Storm Sewer 4 Inflow Outflow Hydrograph Time (hours) 2826242220181614121086Flow (cfs)3 2 1 0 Inflow Area=4.017 ac Avg. Flow Depth=0.48' Max Vel=5.89 fps 24.0" Round Pipe n=0.012 L=87.2' S=0.0122 '/' Capacity=27.02 cfs 3.42 cfs3.42 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 80HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Reach 62R: Storm Sewer 4 Primary Stage-Discharge Discharge (cfs) 2826242220181614121086420Depth (feet)2 1 0 Reach 62R: Storm Sewer 4 Storage Stage-Storage Storage (cubic-feet) 260240220200180160140120100806040200Depth (feet)2 1 0 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 81HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Reach 62R: Storm Sewer 4 Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) 5.00 0.00 0 6,817.06 0.00 5.60 0.00 0 6,817.06 0.00 6.20 0.00 0 6,817.06 0.00 6.80 0.00 0 6,817.06 0.00 7.40 0.00 0 6,817.06 0.00 8.00 0.00 0 6,817.06 0.00 8.60 0.00 0 6,817.06 0.00 9.20 0.00 0 6,817.06 0.00 9.80 0.00 0 6,817.06 0.00 10.40 0.00 0 6,817.07 0.00 11.00 0.03 2 6,817.11 0.03 11.60 0.12 5 6,817.16 0.12 12.20 3.33 50 6,817.53 3.34 12.80 0.72 17 6,817.29 0.73 13.40 0.39 11 6,817.23 0.39 14.00 0.29 9 6,817.20 0.29 14.60 0.23 8 6,817.19 0.23 15.20 0.21 7 6,817.18 0.21 15.80 0.18 6 6,817.18 0.18 16.40 0.16 6 6,817.17 0.16 17.00 0.15 6 6,817.17 0.15 17.60 0.14 5 6,817.16 0.14 18.20 0.13 5 6,817.16 0.13 18.80 0.12 5 6,817.16 0.12 19.40 0.11 5 6,817.15 0.11 20.00 0.10 4 6,817.15 0.10 20.60 0.09 4 6,817.14 0.09 21.20 0.09 4 6,817.14 0.09 21.80 0.09 4 6,817.14 0.09 22.40 0.09 4 6,817.14 0.09 23.00 0.08 4 6,817.14 0.08 23.60 0.08 4 6,817.14 0.08 24.20 0.07 3 6,817.13 0.07 24.80 0.01 1 6,817.08 0.01 25.40 0.00 0 6,817.06 0.00 26.00 0.00 0 6,817.06 0.00 26.60 0.00 0 6,817.06 0.00 27.20 0.00 0 6,817.06 0.00 27.80 0.00 0 6,817.06 0.00 28.40 0.00 0 6,817.06 0.00 29.00 0.00 0 6,817.06 0.00 29.60 0.00 0 6,817.06 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 82HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Reach 62R: Storm Sewer 4 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,817.06 0.00 0.00 6,817.08 0.77 0.00 6,817.10 1.21 0.02 6,817.12 1.58 0.04 6,817.14 1.91 0.08 6,817.16 2.21 0.13 6,817.18 2.49 0.19 6,817.20 2.75 0.27 6,817.22 2.99 0.35 6,817.24 3.23 0.45 6,817.26 3.45 0.56 6,817.28 3.66 0.69 6,817.30 3.87 0.83 6,817.32 4.07 0.98 6,817.34 4.26 1.14 6,817.36 4.44 1.31 6,817.38 4.62 1.50 6,817.40 4.80 1.70 6,817.42 4.97 1.91 6,817.44 5.13 2.13 6,817.46 5.29 2.37 6,817.48 5.45 2.61 6,817.50 5.60 2.87 6,817.52 5.74 3.14 6,817.54 5.89 3.41 6,817.56 6.03 3.70 6,817.58 6.16 4.00 6,817.60 6.30 4.31 6,817.62 6.43 4.63 6,817.64 6.55 4.95 6,817.66 6.68 5.29 6,817.68 6.80 5.64 6,817.70 6.91 5.99 6,817.72 7.03 6.35 6,817.74 7.14 6.73 6,817.76 7.25 7.10 6,817.78 7.36 7.49 6,817.80 7.46 7.88 6,817.82 7.56 8.29 6,817.84 7.66 8.69 6,817.86 7.76 9.11 6,817.88 7.85 9.52 6,817.90 7.95 9.95 6,817.92 8.04 10.38 6,817.94 8.12 10.82 6,817.96 8.21 11.25 6,817.98 8.29 11.70 6,818.00 8.37 12.15 6,818.02 8.45 12.60 6,818.04 8.53 13.05 6,818.06 8.60 13.51 6,818.08 8.67 13.97 6,818.10 8.74 14.43 Elevation (feet) Velocity (ft/sec) Discharge (cfs) 6,818.12 8.81 14.90 6,818.14 8.88 15.36 6,818.16 8.94 15.83 6,818.18 9.00 16.29 6,818.20 9.06 16.76 6,818.22 9.12 17.22 6,818.24 9.17 17.69 6,818.26 9.22 18.15 6,818.28 9.27 18.62 6,818.30 9.32 19.08 6,818.32 9.37 19.53 6,818.34 9.41 19.99 6,818.36 9.46 20.44 6,818.38 9.49 20.89 6,818.40 9.53 21.33 6,818.42 9.57 21.77 6,818.44 9.60 22.20 6,818.46 9.63 22.62 6,818.48 9.66 23.04 6,818.50 9.69 23.45 6,818.52 9.71 23.86 6,818.54 9.73 24.25 6,818.56 9.75 24.64 6,818.58 9.77 25.02 6,818.60 9.78 25.38 6,818.62 9.79 25.74 6,818.64 9.80 26.08 6,818.66 9.80 26.41 6,818.68 9.81 26.73 6,818.70 9.80 27.03 6,818.72 9.80 27.32 6,818.74 9.79 27.59 6,818.76 9.78 27.84 6,818.78 9.77 28.08 6,818.80 9.75 28.29 6,818.82 9.73 28.49 6,818.84 9.70 28.65 6,818.86 9.67 28.80 6,818.88 9.63 28.91 6,818.90 9.59 29.00 6,818.92 9.54 29.05 6,818.94 9.48 29.07 6,818.96 9.42 29.03 6,818.98 9.34 28.95 6,819.00 9.25 28.80 6,819.02 9.13 28.55 6,819.04 8.98 28.15 6,819.06 8.60 27.02 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 83HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Reach 62R: Storm Sewer 4 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,817.06 0.0 0 6,817.08 0.0 0 6,817.10 0.0 1 6,817.12 0.0 2 6,817.14 0.0 4 6,817.16 0.1 5 6,817.18 0.1 7 6,817.20 0.1 8 6,817.22 0.1 10 6,817.24 0.1 12 6,817.26 0.2 14 6,817.28 0.2 16 6,817.30 0.2 19 6,817.32 0.2 21 6,817.34 0.3 23 6,817.36 0.3 26 6,817.38 0.3 28 6,817.40 0.4 31 6,817.42 0.4 34 6,817.44 0.4 36 6,817.46 0.4 39 6,817.48 0.5 42 6,817.50 0.5 45 6,817.52 0.5 48 6,817.54 0.6 51 6,817.56 0.6 54 6,817.58 0.6 57 6,817.60 0.7 60 6,817.62 0.7 63 6,817.64 0.8 66 6,817.66 0.8 69 6,817.68 0.8 72 6,817.70 0.9 76 6,817.72 0.9 79 6,817.74 0.9 82 6,817.76 1.0 85 6,817.78 1.0 89 6,817.80 1.1 92 6,817.82 1.1 96 6,817.84 1.1 99 6,817.86 1.2 102 6,817.88 1.2 106 6,817.90 1.3 109 6,817.92 1.3 113 6,817.94 1.3 116 6,817.96 1.4 120 6,817.98 1.4 123 6,818.00 1.5 127 6,818.02 1.5 130 6,818.04 1.5 133 6,818.06 1.6 137 6,818.08 1.6 140 6,818.10 1.7 144 Elevation (feet) End-Area (sq-ft) Storage (cubic-feet) 6,818.12 1.7 147 6,818.14 1.7 151 6,818.16 1.8 154 6,818.18 1.8 158 6,818.20 1.8 161 6,818.22 1.9 165 6,818.24 1.9 168 6,818.26 2.0 172 6,818.28 2.0 175 6,818.30 2.0 178 6,818.32 2.1 182 6,818.34 2.1 185 6,818.36 2.2 188 6,818.38 2.2 192 6,818.40 2.2 195 6,818.42 2.3 198 6,818.44 2.3 202 6,818.46 2.3 205 6,818.48 2.4 208 6,818.50 2.4 211 6,818.52 2.5 214 6,818.54 2.5 217 6,818.56 2.5 220 6,818.58 2.6 223 6,818.60 2.6 226 6,818.62 2.6 229 6,818.64 2.7 232 6,818.66 2.7 235 6,818.68 2.7 238 6,818.70 2.8 240 6,818.72 2.8 243 6,818.74 2.8 246 6,818.76 2.8 248 6,818.78 2.9 251 6,818.80 2.9 253 6,818.82 2.9 255 6,818.84 3.0 258 6,818.86 3.0 260 6,818.88 3.0 262 6,818.90 3.0 264 6,818.92 3.0 266 6,818.94 3.1 267 6,818.96 3.1 269 6,818.98 3.1 270 6,819.00 3.1 272 6,819.02 3.1 273 6,819.04 3.1 273 6,819.06 3.1 274 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 84HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Summary for Pond 41P: POST-AREA-10-CULVERT [57] Hint: Peaked at 6,882.19' (Flood elevation advised) Inflow Area = 2.069 ac, 12.55% Impervious, Inflow Depth = 0.90" for 100-YR event Inflow = 1.68 cfs @ 12.21 hrs, Volume= 0.155 af Outflow = 1.68 cfs @ 12.21 hrs, Volume= 0.155 af, Atten= 0%, Lag= 0.0 min Primary = 0.46 cfs @ 12.21 hrs, Volume= 0.115 af Secondary = 1.22 cfs @ 12.21 hrs, Volume= 0.040 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-29.99 hrs, dt= 0.03 hrs / 3 Peak Elev= 6,882.19' @ 12.21 hrs Device Routing Invert Outlet Devices #1 Primary 6,881.48'12.0" Round Culvert w/ 9.0" inside fill L= 38.8' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 6,880.73' / 6,879.51' S= 0.0314 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 0.15 sf #2 Secondary 6,882.03'Asymmetrical Weir, C= 3.27 Offset (feet) 0.00 49.91 60.67 72.06 82.74 Height (feet) 1.24 0.00 0.23 0.82 1.24 Primary OutFlow Max=0.46 cfs @ 12.21 hrs HW=6,882.19' TW=6,879.18' (Dynamic Tailwater) 1=Culvert (Inlet Controls 0.46 cfs @ 2.97 fps) Secondary OutFlow Max=1.22 cfs @ 12.21 hrs HW=6,882.19' TW=6,862.65' (Dynamic Tailwater) 2=Asymmetrical Weir (Weir Controls 1.22 cfs @ 0.53 fps) Pond 41P: POST-AREA-10-CULVERT Inflow Outflow Primary Secondary Hydrograph Time (hours) 2826242220181614121086Flow (cfs)1 0 Inflow Area=2.069 ac Peak Elev=6,882.19' 1.68 cfs1.68 cfs 0.46 cfs 1.22 cfs Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 85HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Pond 41P: POST-AREA-10-CULVERT Total Primary Secondary Stage-Discharge Discharge (cfs) 140120100806040200Elevation (feet)6,883 6,882 Culvert Asymmetrical Weir Pond 41P: POST-AREA-10-CULVERT Storage Stage-Area-Storage Storage (acre-feet) 0Elevation (feet)6,883 6,882 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 86HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Hydrograph for Pond 41P: POST-AREA-10-CULVERT Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) Primary (cfs) Secondary (cfs) 5.00 0.00 6,881.48 0.00 0.00 0.00 5.60 0.00 6,881.48 0.00 0.00 0.00 6.20 0.00 6,881.48 0.00 0.00 0.00 6.80 0.00 6,881.48 0.00 0.00 0.00 7.40 0.00 6,881.48 0.00 0.00 0.00 8.00 0.00 6,881.48 0.00 0.00 0.00 8.60 0.00 6,881.48 0.00 0.00 0.00 9.20 0.00 6,881.48 0.00 0.00 0.00 9.80 0.00 6,881.48 0.00 0.00 0.00 10.40 0.00 6,881.48 0.00 0.00 0.00 11.00 0.01 6,881.51 0.01 0.01 0.00 11.60 0.06 6,881.57 0.06 0.06 0.00 12.20 1.68 6,882.19 1.68 0.46 1.22 12.80 0.39 6,882.03 0.39 0.39 0.00 13.40 0.20 6,881.71 0.20 0.20 0.00 14.00 0.15 6,881.66 0.15 0.15 0.00 14.60 0.12 6,881.63 0.12 0.12 0.00 15.20 0.11 6,881.62 0.11 0.11 0.00 15.80 0.09 6,881.61 0.09 0.09 0.00 16.40 0.08 6,881.60 0.08 0.08 0.00 17.00 0.07 6,881.59 0.07 0.07 0.00 17.60 0.07 6,881.59 0.07 0.07 0.00 18.20 0.07 6,881.58 0.07 0.07 0.00 18.80 0.06 6,881.57 0.06 0.06 0.00 19.40 0.06 6,881.57 0.06 0.06 0.00 20.00 0.05 6,881.56 0.05 0.05 0.00 20.60 0.05 6,881.56 0.05 0.05 0.00 21.20 0.05 6,881.56 0.05 0.05 0.00 21.80 0.04 6,881.56 0.04 0.04 0.00 22.40 0.04 6,881.56 0.04 0.04 0.00 23.00 0.04 6,881.55 0.04 0.04 0.00 23.60 0.04 6,881.55 0.04 0.04 0.00 24.20 0.04 6,881.55 0.04 0.04 0.00 24.80 0.00 6,881.49 0.00 0.00 0.00 25.40 0.00 6,881.48 0.00 0.00 0.00 26.00 0.00 6,881.48 0.00 0.00 0.00 26.60 0.00 6,881.48 0.00 0.00 0.00 27.20 0.00 6,881.48 0.00 0.00 0.00 27.80 0.00 6,881.48 0.00 0.00 0.00 28.40 0.00 6,881.48 0.00 0.00 0.00 29.00 0.00 6,881.48 0.00 0.00 0.00 29.60 0.00 6,881.48 0.00 0.00 0.00 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 87HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Discharge for Pond 41P: POST-AREA-10-CULVERT Elevation (feet) Discharge (cfs) Primary (cfs) Secondary (cfs) 6,881.48 0.00 0.00 0.00 6,881.50 0.01 0.01 0.00 6,881.52 0.02 0.02 0.00 6,881.54 0.03 0.03 0.00 6,881.56 0.05 0.05 0.00 6,881.58 0.07 0.07 0.00 6,881.60 0.08 0.08 0.00 6,881.62 0.10 0.10 0.00 6,881.64 0.13 0.13 0.00 6,881.66 0.15 0.15 0.00 6,881.68 0.17 0.17 0.00 6,881.70 0.19 0.19 0.00 6,881.72 0.21 0.21 0.00 6,881.74 0.23 0.23 0.00 6,881.76 0.24 0.24 0.00 6,881.78 0.26 0.26 0.00 6,881.80 0.27 0.27 0.00 6,881.82 0.28 0.28 0.00 6,881.84 0.29 0.29 0.00 6,881.86 0.31 0.31 0.00 6,881.88 0.32 0.32 0.00 6,881.90 0.33 0.33 0.00 6,881.92 0.34 0.34 0.00 6,881.94 0.35 0.35 0.00 6,881.96 0.36 0.36 0.00 6,881.98 0.37 0.37 0.00 6,882.00 0.38 0.38 0.00 6,882.02 0.38 0.38 0.00 6,882.04 0.39 0.39 0.00 6,882.06 0.42 0.40 0.02 6,882.08 0.47 0.41 0.06 6,882.10 0.57 0.42 0.15 6,882.12 0.70 0.43 0.28 6,882.14 0.89 0.44 0.46 6,882.16 1.14 0.44 0.69 6,882.18 1.44 0.45 0.99 6,882.20 1.81 0.46 1.36 6,882.22 2.26 0.47 1.79 6,882.24 2.77 0.47 2.30 6,882.26 3.37 0.48 2.89 6,882.28 4.04 0.49 3.56 6,882.30 4.79 0.49 4.30 6,882.32 5.62 0.50 5.12 6,882.34 6.53 0.51 6.03 6,882.36 7.52 0.51 7.01 6,882.38 8.59 0.52 8.07 6,882.40 9.74 0.53 9.22 6,882.42 10.98 0.53 10.45 6,882.44 12.30 0.54 11.76 6,882.46 13.71 0.55 13.16 6,882.48 15.20 0.55 14.65 6,882.50 16.78 0.56 16.23 6,882.52 18.46 0.56 17.89 Elevation (feet) Discharge (cfs) Primary (cfs) Secondary (cfs) 6,882.54 20.23 0.57 19.65 6,882.56 22.08 0.58 21.51 6,882.58 24.04 0.58 23.46 6,882.60 26.09 0.59 25.50 6,882.62 28.24 0.59 27.64 6,882.64 30.48 0.60 29.88 6,882.66 32.83 0.61 32.23 6,882.68 35.28 0.61 34.67 6,882.70 37.83 0.62 37.21 6,882.72 40.48 0.62 39.86 6,882.74 43.24 0.63 42.62 6,882.76 46.11 0.63 45.48 6,882.78 49.09 0.64 48.45 6,882.80 52.17 0.64 51.53 6,882.82 55.36 0.65 54.71 6,882.84 58.67 0.65 58.01 6,882.86 62.08 0.66 61.43 6,882.88 65.62 0.66 64.95 6,882.90 69.27 0.67 68.60 6,882.92 73.03 0.67 72.36 6,882.94 76.92 0.68 76.24 6,882.96 80.93 0.68 80.25 6,882.98 85.07 0.69 84.38 6,883.00 89.33 0.69 88.63 6,883.02 93.71 0.70 93.01 6,883.04 98.22 0.70 97.52 6,883.06 102.87 0.71 102.16 6,883.08 107.64 0.71 106.93 6,883.10 112.54 0.72 111.83 6,883.12 117.58 0.72 116.86 6,883.14 122.76 0.73 122.03 6,883.16 128.06 0.73 127.33 6,883.18 133.51 0.74 132.77 6,883.20 139.09 0.74 138.35 6,883.22 144.82 0.75 144.07 6,883.24 150.68 0.75 149.93 6,883.26 156.69 0.76 155.93 Type II 24-hr 100-YR Rainfall=2.81", Ia/S=0.1503385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 88HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 41P: POST-AREA-10-CULVERT Elevation (feet) Storage (acre-feet) 6,881.48 0.000 6,881.50 0.000 6,881.52 0.000 6,881.54 0.000 6,881.56 0.000 6,881.58 0.000 6,881.60 0.000 6,881.62 0.000 6,881.64 0.000 6,881.66 0.000 6,881.68 0.000 6,881.70 0.000 6,881.72 0.000 6,881.74 0.000 6,881.76 0.000 6,881.78 0.000 6,881.80 0.000 6,881.82 0.000 6,881.84 0.000 6,881.86 0.000 6,881.88 0.000 6,881.90 0.000 6,881.92 0.000 6,881.94 0.000 6,881.96 0.000 6,881.98 0.000 6,882.00 0.000 6,882.02 0.000 6,882.04 0.000 6,882.06 0.000 6,882.08 0.000 6,882.10 0.000 6,882.12 0.000 6,882.14 0.000 6,882.16 0.000 6,882.18 0.000 6,882.20 0.000 6,882.22 0.000 6,882.24 0.000 6,882.26 0.000 6,882.28 0.000 6,882.30 0.000 6,882.32 0.000 6,882.34 0.000 6,882.36 0.000 6,882.38 0.000 6,882.40 0.000 6,882.42 0.000 6,882.44 0.000 6,882.46 0.000 6,882.48 0.000 6,882.50 0.000 6,882.52 0.000 Elevation (feet) Storage (acre-feet) 6,882.54 0.000 6,882.56 0.000 6,882.58 0.000 6,882.60 0.000 6,882.62 0.000 6,882.64 0.000 6,882.66 0.000 6,882.68 0.000 6,882.70 0.000 6,882.72 0.000 6,882.74 0.000 6,882.76 0.000 6,882.78 0.000 6,882.80 0.000 6,882.82 0.000 6,882.84 0.000 6,882.86 0.000 6,882.88 0.000 6,882.90 0.000 6,882.92 0.000 6,882.94 0.000 6,882.96 0.000 6,882.98 0.000 6,883.00 0.000 6,883.02 0.000 6,883.04 0.000 6,883.06 0.000 6,883.08 0.000 6,883.10 0.000 6,883.12 0.000 6,883.14 0.000 6,883.16 0.000 6,883.18 0.000 6,883.20 0.000 6,883.22 0.000 6,883.24 0.000 6,883.26 0.000 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 89HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment 40S: POST-AREA-10 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 25-YR 2.21 0.96 0.094 0.55 100-YR 2.81 1.68 0.155 0.90 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 90HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Subcatchment 42S: POST-AREA-03 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 25-YR 2.21 1.22 0.094 0.58 100-YR 2.81 2.06 0.153 0.95 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 91HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 43R: POST-CULVERT-10A Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 0.44 0.44 6,879.17 9 100-YR 0.46 0.46 6,879.18 9 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 92HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 44R: POST-Reach-10B Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 0.44 0.44 6,877.39 17 100-YR 0.46 0.46 6,877.39 18 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 93HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 45R: POST-Reach-10C Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 0.96 0.94 6,862.60 173 100-YR 1.68 1.65 6,862.65 264 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 94HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 48R: POST-Reach 03C Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 1.96 1.96 6,810.78 63 100-YR 3.42 3.42 6,810.82 93 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 95HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 50R: POST-Reach-03B Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 1.96 1.96 6,816.83 53 100-YR 3.42 3.42 6,816.90 80 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 96HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Reach 62R: Storm Sewer 4 Event Inflow (cfs) Outflow (cfs) Elevation (feet) Storage (cubic-feet) 25-YR 1.96 1.96 6,817.42 34 100-YR 3.42 3.42 6,817.54 51 Multi-Event Tables03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering Page 97HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC Events for Pond 41P: POST-AREA-10-CULVERT Event Inflow (cfs) Outflow (cfs) Primary (cfs) Secondary (cfs) Elevation (feet) Storage (acre-feet) 25-YR 0.96 0.96 0.44 0.53 6,882.15 0.000 100-YR 1.68 1.68 0.46 1.22 6,882.19 0.000 Table of Contents03385-2020-20210713 Printed 7/14/2021Prepared by Gamba Engineering HydroCAD® 10.10-5a s/n 04370 © 2020 HydroCAD Software Solutions LLC TABLE OF CONTENTS Project Reports 1 Routing Diagram 2 Rainfall Events Listing (selected events) 3 Area Listing (selected nodes) 4 Soil Listing (selected nodes) 5 Ground Covers (selected nodes) 6 Pipe Listing (selected nodes) 25-YR Event 7 Node Listing 8 Subcat 40S: POST-AREA-10 11 Subcat 42S: POST-AREA-03 13 Reach 43R: POST-CULVERT-10A 18 Reach 44R: POST-Reach-10B 23 Reach 45R: POST-Reach-10C 28 Reach 48R: POST-Reach 03C 33 Reach 50R: POST-Reach-03B 38 Reach 62R: Storm Sewer 4 43 Pond 41P: POST-AREA-10-CULVERT 100-YR Event 48 Node Listing 49 Subcat 40S: POST-AREA-10 52 Subcat 42S: POST-AREA-03 54 Reach 43R: POST-CULVERT-10A 59 Reach 44R: POST-Reach-10B 64 Reach 45R: POST-Reach-10C 69 Reach 48R: POST-Reach 03C 74 Reach 50R: POST-Reach-03B 79 Reach 62R: Storm Sewer 4 84 Pond 41P: POST-AREA-10-CULVERT Multi-Event Tables 89 Subcat 40S: POST-AREA-10 90 Subcat 42S: POST-AREA-03 91 Reach 43R: POST-CULVERT-10A 92 Reach 44R: POST-Reach-10B 93 Reach 45R: POST-Reach-10C 94 Reach 48R: POST-Reach 03C 95 Reach 50R: POST-Reach-03B 96 Reach 62R: Storm Sewer 4 97 Pond 41P: POST-AREA-10-CULVERT APPENDIX C Precipitation Frequency Data NOAA Atlas 14, Volume 8, Version 2 APPENDIX D Custom Soil Resource Report Natural Resources Conservation Service United States Department of Agriculture A product of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom Soil Resource Report for Aspen-Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties; and Holy Cross Area, Colorado, Parts of Eagle, Garfield, Mesa, Pitkin, and Summit Counties Natural Resources Conservation Service April 13, 2021 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nrcs.usda.gov/wps/ portal/nrcs/main/soils/health/) and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (https://offices.sc.egov.usda.gov/locator/app?agency=nrcs) or your NRCS State Soil Scientist (http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/contactus/? cid=nrcs142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (NRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require 2 alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. 3 Contents Preface....................................................................................................................2 How Soil Surveys Are Made..................................................................................6 Soil Map..................................................................................................................9 Soil Map..............................................................................................................10 Legend................................................................................................................11 Map Unit Legend................................................................................................13 Map Unit Descriptions........................................................................................14 Aspen-Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties...................................................................................................17 4—Acree loam, 6 to 12 percent slopes.......................................................17 9—Ansel-Anvik association, 25 to 45 percent slopes.................................18 10—Anvik-Skylick-Sligting association, 10 to 25 percent slopes................20 11—Anvik-Skylick-Sligting association, 25 to 50 percent slopes................22 12—Arle-Ansari-Rock outcrop complex, 12 to 50 percent slopes...............24 18—Cochetopa-Antrobus association, 12 to 25 percent slopes.................27 19—Cochetopa-Antrobus association, 25 to 50 percent slopes.................28 42—Fluvaquents, 0 to 10 percent slopes....................................................30 64—Jerry loam, 25 to 65 percent slopes.....................................................31 94—Showalter-Morval complex, 5 to 15 percent slopes.............................32 95—Showalter-Morval complex, 15 to 25 percent slopes...........................34 104—Torriorthents-Camborthids-Rock outcrop complex, 6 to 65 percent..36 Holy Cross Area, Colorado, Parts of Eagle, Garfield, Mesa, Pitkin, and Summit Counties......................................................................................39 104A—Haplocryolls-Cryaquolls complex, 0 to 15 percent slopes...............39 220B—Leadville family, till substratum, 5 to 40 percent slopes..................40 226B—Leadville family-Cryaquolls complex, 0 to 25 percent slopes..........41 313B—Scout family-Rubble land-Seitz family complex, 5 to 40 percent slopes....................................................................................................43 331C—Peeler-Leadville families complex, 40 to 65 percent slopes...........45 333B—Fughes-Godding families complex, 5 to 40 percent slopes.............46 333C—Herm-Kolob families complex, 40 to 65 percent slopes..................48 338B—Wetopa-Doughspon-Echemoor families complex, 5 to 40 percent slopes.......................................................................................50 345B—Doughspoon family, 5 to 40 percent slopes....................................52 345C—Doughspoon family, 40 to 60 percent slopes..................................53 354B—Typic Argicryolls-Typic Haplocryalfs complex, 5 to 40 percent slopes....................................................................................................54 367B—Scout-Leadville families complex, 5 to 40 percent slopes...............56 420C—Subwell-Duffymont families complex, 40 to 65 percent slopes.......57 449C—Tampico-Echemoor-Eyre families complex, 30 to 65 percent slopes....................................................................................................59 654D—Tolby family-Rock outcrop-Hiwan family complex, 40 to 75 percent slopes.......................................................................................61 AG9—Ansel-Anvik association, 25 to 45 percent slopes............................63 4 AG11—Anvik-Skylick-Sligting association, 25 to 50 percent slopes...........64 Soil Information for All Uses...............................................................................68 Soil Properties and Qualities..............................................................................68 Soil Qualities and Features.............................................................................68 Hydrologic Soil Group.................................................................................68 References............................................................................................................76 Glossary................................................................................................................78 Custom Soil Resource Report 5 How Soil Surveys Are Made Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas (MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform, a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape. Commonly, individual soils on the landscape merge into one another as their characteristics gradually change. To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil-vegetation-landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes (units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil 6 scientists classified and named the soils in the survey area, they compared the individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping, design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil-landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil-landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include field measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of characteristics for the components. The aggregated values are presented. Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other properties. While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field-observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management. Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and Custom Soil Resource Report 7 identified each as a specific map unit. Aerial photographs show trees, buildings, fields, roads, and rivers, all of which help in locating boundaries accurately. Custom Soil Resource Report 8 Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. 9 10 Custom Soil Resource Report Soil Map 436590043666004367300436800043687004369400436590043666004367300436800043687004369400295300 296000 296700 297400 298100 298800 299500 300200 300900 301600 295300 296000 296700 297400 298100 298800 299500 300200 300900 301600 39° 27' 14'' N 107° 22' 47'' W39° 27' 14'' N107° 18' 16'' W39° 24' 57'' N 107° 22' 47'' W39° 24' 57'' N 107° 18' 16'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 0 1000 2000 4000 6000 Feet 0 400 800 1600 2400 Meters Map Scale: 1:29,700 if printed on A landscape (11" x 8.5") sheet. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:24,000. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Aspen-Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties Survey Area Data: Version 11, Jun 5, 2020 Soil Survey Area: Holy Cross Area, Colorado, Parts of Eagle, Garfield, Mesa, Pitkin, and Summit Counties Survey Area Data: Version 3, Jun 11, 2020 Your area of interest (AOI) includes more than one soil survey area. These survey areas may have been mapped at different scales, with a different land use in mind, at different times, or at different levels of detail. This may result in map unit symbols, soil properties, and interpretations that do not completely agree across soil survey area boundaries. Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jul 14, 2010—Nov 1, 2017 Custom Soil Resource Report 11 MAP LEGEND MAP INFORMATION The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Custom Soil Resource Report 12 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 4 Acree loam, 6 to 12 percent slopes 183.2 4.0% 9 Ansel-Anvik association, 25 to 45 percent slopes 47.8 1.1% 10 Anvik-Skylick-Sligting association, 10 to 25 percent slopes 20.2 0.4% 11 Anvik-Skylick-Sligting association, 25 to 50 percent slopes 231.3 5.1% 12 Arle-Ansari-Rock outcrop complex, 12 to 50 percent slopes 14.6 0.3% 18 Cochetopa-Antrobus association, 12 to 25 percent slopes 37.4 0.8% 19 Cochetopa-Antrobus association, 25 to 50 percent slopes 30.8 0.7% 42 Fluvaquents, 0 to 10 percent slopes 29.7 0.7% 64 Jerry loam, 25 to 65 percent slopes 485.5 10.7% 94 Showalter-Morval complex, 5 to 15 percent slopes 65.4 1.4% 95 Showalter-Morval complex, 15 to 25 percent slopes 295.1 6.5% 104 Torriorthents-Camborthids-Rock outcrop complex, 6 to 65 percent 86.8 1.9% Subtotals for Soil Survey Area 1,527.9 33.7% Totals for Area of Interest 4,530.0 100.0% Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 104A Haplocryolls-Cryaquolls complex, 0 to 15 percent slopes 27.2 0.6% 220B Leadville family, till substratum, 5 to 40 percent slopes 509.0 11.2% 226B Leadville family-Cryaquolls complex, 0 to 25 percent slopes 71.4 1.6% 313B Scout family-Rubble land-Seitz family complex, 5 to 40 percent slopes 171.6 3.8% Custom Soil Resource Report 13 Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 331C Peeler-Leadville families complex, 40 to 65 percent slopes 49.9 1.1% 333B Fughes-Godding families complex, 5 to 40 percent slopes 118.4 2.6% 333C Herm-Kolob families complex, 40 to 65 percent slopes 53.7 1.2% 338B Wetopa-Doughspon-Echemoor families complex, 5 to 40 percent slopes 702.4 15.5% 345B Doughspoon family, 5 to 40 percent slopes 369.3 8.2% 345C Doughspoon family, 40 to 60 percent slopes 7.0 0.2% 354B Typic Argicryolls-Typic Haplocryalfs complex, 5 to 40 percent slopes 55.2 1.2% 367B Scout-Leadville families complex, 5 to 40 percent slopes 149.5 3.3% 420C Subwell-Duffymont families complex, 40 to 65 percent slopes 134.7 3.0% 449C Tampico-Echemoor-Eyre families complex, 30 to 65 percent slopes 94.3 2.1% 654D Tolby family-Rock outcrop- Hiwan family complex, 40 to 75 percent slopes 369.0 8.1% AG9 Ansel-Anvik association, 25 to 45 percent slopes 62.9 1.4% AG11 Anvik-Skylick-Sligting association, 25 to 50 percent slopes 56.2 1.2% Subtotals for Soil Survey Area 3,001.7 66.3% Totals for Area of Interest 4,530.0 100.0% Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some Custom Soil Resource Report 14 observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The Custom Soil Resource Report 15 pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha-Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. Custom Soil Resource Report 16 Aspen-Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties 4—Acree loam, 6 to 12 percent slopes Map Unit Setting National map unit symbol: jq5w Elevation: 6,500 to 8,200 feet Mean annual precipitation: 16 to 18 inches Mean annual air temperature: 38 to 42 degrees F Frost-free period: 95 to 105 days Farmland classification: Not prime farmland Map Unit Composition Acree and similar soils:90 percent Minor components:10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Acree Setting Landform:Alluvial fans, valley sides Down-slope shape:Linear Across-slope shape:Linear Parent material:Alluvium derived from sandstone and shale and/or residuum weathered from sandstone and shale Typical profile H1 - 0 to 10 inches: loam H2 - 10 to 27 inches: clay H3 - 27 to 60 inches: gravelly clay loam, clay loam H3 - 27 to 60 inches: Properties and qualities Slope:6 to 12 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat):Moderately low to moderately high (0.06 to 0.20 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Calcium carbonate, maximum content:10 percent Maximum salinity:Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water capacity:Very high (about 14.0 inches) Interpretive groups Land capability classification (irrigated): 4e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: C Ecological site: R048AY228CO Other vegetative classification: Mountain Loam (null_42) Hydric soil rating: No Custom Soil Resource Report 17 Minor Components Other soils Percent of map unit:10 percent Hydric soil rating: No 9—Ansel-Anvik association, 25 to 45 percent slopes Map Unit Setting National map unit symbol: jq7n Elevation: 7,500 to 9,500 feet Mean annual precipitation: 18 to 22 inches Mean annual air temperature: 38 to 40 degrees F Frost-free period: 70 to 80 days Farmland classification: Not prime farmland Map Unit Composition Ansel and similar soils:70 percent Anvik and similar soils:20 percent Minor components:10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Ansel Setting Landform:Fans, hills Landform position (two-dimensional):Footslope Landform position (three-dimensional):Lower third of mountainflank Down-slope shape:Linear Across-slope shape:Linear Parent material:Mixed alluvium Typical profile H1 - 0 to 23 inches: loam H2 - 23 to 48 inches: stony clay loam H3 - 48 to 60 inches: clay loam Properties and qualities Slope:25 to 45 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.20 to 0.60 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:High (about 9.3 inches) Custom Soil Resource Report 18 Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Other vegetative classification: Spruce-Fir (null_21) Hydric soil rating: No Description of Anvik Setting Landform:Mountain slopes, fans Landform position (three-dimensional):Lower third of mountainflank Down-slope shape:Linear Across-slope shape:Linear Parent material:Mixed alluvium and/or mixed colluvium Typical profile H1 - 0 to 12 inches: loam H2 - 12 to 18 inches: sandy loam H3 - 18 to 42 inches: cobbly clay loam, clay loam H3 - 18 to 42 inches: cobbly clay loam H4 - 42 to 60 inches: Properties and qualities Slope:25 to 45 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat):Moderately high to high (0.20 to 2.00 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:Very high (about 12.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: B Other vegetative classification: Spruce-Fir (null_21) Hydric soil rating: No Minor Components Other soils Percent of map unit:10 percent Hydric soil rating: No Custom Soil Resource Report 19 10—Anvik-Skylick-Sligting association, 10 to 25 percent slopes Map Unit Setting National map unit symbol: jq46 Elevation: 7,500 to 9,500 feet Mean annual precipitation: 18 to 22 inches Mean annual air temperature: 38 to 40 degrees F Frost-free period: 70 to 80 days Farmland classification: Not prime farmland Map Unit Composition Sligting and similar soils:35 percent Anvik and similar soils:30 percent Skylick and similar soils:25 percent Minor components:10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Sligting Setting Landform:Mountains Landform position (three-dimensional):Mountainflank Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium derived from sandstone and/or colluvium derived from basalt and/or residuum weathered from sandstone and/or residuum weathered from basalt Typical profile H1 - 0 to 24 inches: very stony loam H2 - 24 to 30 inches: extremely cobbly clay loam H3 - 30 to 36 inches: very cobbly clay H4 - 36 to 60 inches: very stony clay Properties and qualities Slope:10 to 25 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat):Moderately low to moderately high (0.06 to 0.20 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:Low (about 4.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Custom Soil Resource Report 20 Hydrologic Soil Group: C Hydric soil rating: No Description of Anvik Setting Landform:Fans, mountain slopes Landform position (three-dimensional):Lower third of mountainflank Down-slope shape:Linear Across-slope shape:Linear Parent material:Mixed alluvium and/or mixed colluvium Typical profile H1 - 0 to 12 inches: loam H2 - 12 to 18 inches: sandy loam H3 - 18 to 42 inches: cobbly clay loam, clay loam H3 - 18 to 42 inches: cobbly clay loam H4 - 42 to 60 inches: Properties and qualities Slope:10 to 25 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat):Moderately high to high (0.20 to 2.00 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:Very high (about 12.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6e Hydrologic Soil Group: B Other vegetative classification: QUAKING ASPEN (null_18) Hydric soil rating: No Description of Skylick Setting Landform:Mountains Landform position (three-dimensional):Mountainflank Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium derived from sandstone and/or residuum weathered from sandstone Typical profile H1 - 0 to 31 inches: loam H2 - 31 to 48 inches: clay loam H3 - 48 to 60 inches: gravelly sandy clay loam Properties and qualities Slope:10 to 25 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: Medium Custom Soil Resource Report 21 Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.20 to 0.60 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:High (about 9.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6e Hydrologic Soil Group: C Hydric soil rating: No Minor Components Other soils Percent of map unit:10 percent Hydric soil rating: No 11—Anvik-Skylick-Sligting association, 25 to 50 percent slopes Map Unit Setting National map unit symbol: jq4k Elevation: 7,500 to 9,500 feet Mean annual precipitation: 18 to 22 inches Mean annual air temperature: 38 to 40 degrees F Frost-free period: 70 to 80 days Farmland classification: Not prime farmland Map Unit Composition Sligting and similar soils:35 percent Skylick and similar soils:30 percent Anvik and similar soils:25 percent Minor components:10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Sligting Setting Landform:Mountains Landform position (three-dimensional):Mountainflank Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium derived from sandstone and/or colluvium derived from basalt and/or residuum weathered from sandstone and/or residuum weathered from basalt Custom Soil Resource Report 22 Typical profile H1 - 0 to 24 inches: very stony loam H2 - 24 to 30 inches: extremely cobbly clay loam H3 - 30 to 36 inches: very cobbly clay H4 - 36 to 60 inches: very stony clay Properties and qualities Slope:25 to 50 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat):Moderately low to moderately high (0.06 to 0.20 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:Low (about 4.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: C Other vegetative classification: QUAKING ASPEN (null_18) Hydric soil rating: No Description of Skylick Setting Landform:Mountains Landform position (three-dimensional):Mountainflank Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium derived from sandstone and/or residuum weathered from sandstone Typical profile H1 - 0 to 31 inches: loam H2 - 31 to 48 inches: clay loam H3 - 48 to 60 inches: gravelly sandy clay loam Properties and qualities Slope:25 to 50 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.20 to 0.60 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:High (about 9.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Other vegetative classification: QUAKING ASPEN (null_18) Custom Soil Resource Report 23 Hydric soil rating: No Description of Anvik Setting Landform:Fans, mountain slopes Landform position (three-dimensional):Lower third of mountainflank Down-slope shape:Linear Across-slope shape:Linear Parent material:Mixed alluvium and/or mixed colluvium Typical profile H1 - 0 to 12 inches: loam H2 - 12 to 18 inches: sandy loam H3 - 18 to 42 inches: clay loam, cobbly clay loam H3 - 18 to 42 inches: cobbly clay loam H4 - 42 to 60 inches: Properties and qualities Slope:25 to 50 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat):Moderately high to high (0.20 to 2.00 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:Very high (about 12.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: B Other vegetative classification: QUAKING ASPEN (null_18) Hydric soil rating: No Minor Components Other soils Percent of map unit:10 percent Hydric soil rating: No 12—Arle-Ansari-Rock outcrop complex, 12 to 50 percent slopes Map Unit Setting National map unit symbol: jq4x Elevation: 6,000 to 8,200 feet Mean annual precipitation: 16 to 18 inches Custom Soil Resource Report 24 Mean annual air temperature: 42 to 45 degrees F Frost-free period: 80 to 100 days Farmland classification: Not prime farmland Map Unit Composition Arle and similar soils:40 percent Ansari and similar soils:30 percent Rock outcrop:20 percent Minor components:10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Arle Setting Landform:Valley sides, ridges, mountains Landform position (three-dimensional):Mountainflank Down-slope shape:Convex Across-slope shape:Convex Parent material:Residuum weathered from sandstone and shale Typical profile H1 - 0 to 10 inches: very stony loam H2 - 10 to 30 inches: very stony sandy loam H3 - 30 to 34 inches: weathered bedrock Properties and qualities Slope:12 to 50 percent Depth to restrictive feature:20 to 40 inches to paralithic bedrock Drainage class:Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat):Moderately low to high (0.06 to 2.00 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Calcium carbonate, maximum content:10 percent Maximum salinity:Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water capacity:Very low (about 2.2 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: B Ecological site: R048AY303CO Other vegetative classification: LOAMY SLOPES (null_31) Hydric soil rating: No Description of Ansari Setting Landform:Mountains, ridges Landform position (three-dimensional):Mountainflank Down-slope shape:Linear Across-slope shape:Linear Parent material:Residuum weathered from sandstone and shale Custom Soil Resource Report 25 Typical profile H1 - 0 to 8 inches: loam H2 - 8 to 14 inches: loam H3 - 14 to 18 inches: unweathered bedrock Properties and qualities Slope:12 to 50 percent Depth to restrictive feature:10 to 20 inches to lithic bedrock Drainage class:Well drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat):Moderately low to moderately high (0.06 to 0.20 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Calcium carbonate, maximum content:10 percent Maximum salinity:Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water capacity:Very low (about 2.3 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: D Ecological site: R048AY303CO Other vegetative classification: LOAMY SLOPES (null_31) Hydric soil rating: No Description of Rock Outcrop Typical profile H1 - 0 to 60 inches: unweathered bedrock Properties and qualities Slope:25 to 50 percent Depth to restrictive feature:0 inches to lithic bedrock Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat):Very low to low (0.00 to 0.00 in/hr) Available water capacity:Very low (about 0.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 8s Hydrologic Soil Group: D Hydric soil rating: No Minor Components Other soils Percent of map unit:10 percent Hydric soil rating: No Custom Soil Resource Report 26 18—Cochetopa-Antrobus association, 12 to 25 percent slopes Map Unit Setting National map unit symbol: jq53 Elevation: 8,500 to 10,500 feet Mean annual precipitation: 18 to 20 inches Mean annual air temperature: 36 to 38 degrees F Frost-free period: 45 to 60 days Farmland classification: Not prime farmland Map Unit Composition Cochetopa and similar soils:45 percent Antrobus and similar soils:35 percent Minor components:20 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Cochetopa Setting Landform:Fans, mountains Landform position (three-dimensional):Lower third of mountainflank Down-slope shape:Linear Across-slope shape:Linear Parent material:Alluvium derived from basalt Typical profile H1 - 0 to 3 inches: loam H2 - 3 to 38 inches: clay loam H3 - 38 to 60 inches: gravelly clay loam Properties and qualities Slope:12 to 20 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.20 to 0.60 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:High (about 10.4 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6e Hydrologic Soil Group: C Ecological site: R048AY250CO Custom Soil Resource Report 27 Other vegetative classification: subalpine loam (null_84) Hydric soil rating: No Description of Antrobus Setting Landform:Fans, mountains Landform position (three-dimensional):Lower third of mountainflank Down-slope shape:Linear Across-slope shape:Linear Parent material:Alluvium derived from basalt and/or colluvium derived from basalt Typical profile H1 - 0 to 13 inches: very stony loam H2 - 13 to 60 inches: extremely stony loam Properties and qualities Slope:15 to 25 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat):Moderately high to high (0.20 to 2.00 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Calcium carbonate, maximum content:10 percent Maximum salinity:Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water capacity:Low (about 3.4 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: B Ecological site: R048AY237CO - Stony Loam Other vegetative classification: Stony Loam (null_82) Hydric soil rating: No Minor Components Other soils Percent of map unit:20 percent Hydric soil rating: No 19—Cochetopa-Antrobus association, 25 to 50 percent slopes Map Unit Setting National map unit symbol: jq54 Elevation: 8,500 to 10,500 feet Mean annual precipitation: 18 to 20 inches Custom Soil Resource Report 28 Mean annual air temperature: 36 to 38 degrees F Frost-free period: 45 to 60 days Farmland classification: Not prime farmland Map Unit Composition Cochetopa and similar soils:45 percent Antrobus and similar soils:40 percent Minor components:15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Cochetopa Setting Landform:Fans, mountains Landform position (three-dimensional):Lower third of mountainflank Down-slope shape:Linear Across-slope shape:Linear Parent material:Alluvium derived from basalt Typical profile H1 - 0 to 3 inches: loam H2 - 3 to 38 inches: clay loam H3 - 38 to 60 inches: gravelly clay loam Properties and qualities Slope:25 to 40 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.20 to 0.60 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:High (about 10.4 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Ecological site: R048AY250CO Other vegetative classification: subalpine loam (null_84) Hydric soil rating: No Description of Antrobus Setting Landform:Fans, mountains Landform position (three-dimensional):Lower third of mountainflank Down-slope shape:Linear Across-slope shape:Linear Parent material:Alluvium derived from basalt and/or colluvium derived from basalt Typical profile H1 - 0 to 13 inches: very stony loam H2 - 13 to 60 inches: extremely stony loam Custom Soil Resource Report 29 Properties and qualities Slope:30 to 50 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat):Moderately high to high (0.20 to 2.00 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Calcium carbonate, maximum content:10 percent Maximum salinity:Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water capacity:Low (about 3.4 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: B Ecological site: R048AY237CO - Stony Loam Other vegetative classification: Stony Loam (null_82) Hydric soil rating: No Minor Components Other soils Percent of map unit:15 percent Other vegetative classification:SOT (null_80) Hydric soil rating: No 42—Fluvaquents, 0 to 10 percent slopes Map Unit Setting National map unit symbol: jq5z Elevation: 3,500 to 7,200 feet Mean annual precipitation: 14 to 18 inches Mean annual air temperature: 45 to 52 degrees F Frost-free period: 80 to 150 days Farmland classification: Not prime farmland Map Unit Composition Fluvaquents and similar soils:90 percent Minor components:10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Fluvaquents Setting Landform:Flood plains, valley floors Down-slope shape:Concave Custom Soil Resource Report 30 Across-slope shape:Linear Parent material:Mixed alluvium Typical profile H1 - 0 to 10 inches: variable H2 - 10 to 24 inches: stratified gravelly sand to clay H3 - 24 to 60 inches: very gravelly sand, gravelly sand H3 - 24 to 60 inches: Properties and qualities Slope:0 to 10 percent Depth to restrictive feature:More than 80 inches Drainage class:Somewhat poorly drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat):Moderately high to high (0.60 to 2.00 in/hr) Depth to water table:About 6 to 24 inches Frequency of flooding:OccasionalNone Frequency of ponding:None Calcium carbonate, maximum content:10 percent Maximum salinity:Nonsaline to moderately saline (0.0 to 8.0 mmhos/cm) Available water capacity:Moderate (about 8.2 inches) Interpretive groups Land capability classification (irrigated): 6w Land capability classification (nonirrigated): 6w Hydrologic Soil Group: B/D Ecological site: R048AY236CO - River Bottom Other vegetative classification: riverbottom (null_19) Hydric soil rating: No Minor Components Redrob Percent of map unit:10 percent Hydric soil rating: No 64—Jerry loam, 25 to 65 percent slopes Map Unit Setting National map unit symbol: jq6r Elevation: 7,500 to 9,500 feet Mean annual precipitation: 18 to 20 inches Mean annual air temperature: 37 to 40 degrees F Frost-free period: 70 to 80 days Farmland classification: Not prime farmland Map Unit Composition Jerry and similar soils:85 percent Minor components:15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Custom Soil Resource Report 31 Description of Jerry Setting Landform:Alluvial fans, hills Landform position (two-dimensional):Footslope Landform position (three-dimensional):Base slope Down-slope shape:Linear Across-slope shape:Linear Parent material:Alluvium derived from sandstone and shale Typical profile H1 - 0 to 11 inches: loam H2 - 11 to 34 inches: channery clay loam H3 - 34 to 60 inches: very channery clay loam Properties and qualities Slope:25 to 65 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.20 to 0.60 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Calcium carbonate, maximum content:5 percent Available water capacity:Moderate (about 7.8 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Ecological site: R048AY238CO Other vegetative classification: BRUSHY LOAM (null_4) Hydric soil rating: No Minor Components Other soils Percent of map unit:15 percent Hydric soil rating: No 94—Showalter-Morval complex, 5 to 15 percent slopes Map Unit Setting National map unit symbol: jq7t Elevation: 7,000 to 8,500 feet Mean annual precipitation: 14 to 16 inches Mean annual air temperature: 42 to 44 degrees F Frost-free period: 80 to 90 days Custom Soil Resource Report 32 Farmland classification: Not prime farmland Map Unit Composition Showalter and similar soils:45 percent Morval and similar soils:35 percent Minor components:20 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Showalter Setting Landform:Terraces, alluvial fans, valley sides Landform position (three-dimensional):Tread Down-slope shape:Linear Across-slope shape:Linear Parent material:Alluvium derived from basalt Typical profile H1 - 0 to 8 inches: very stony loam H2 - 8 to 39 inches: very cobbly clay H3 - 39 to 60 inches: very cobbly clay loam Properties and qualities Slope:5 to 15 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat):Moderately low to moderately high (0.06 to 0.20 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Calcium carbonate, maximum content:10 percent Available water capacity:Low (about 5.5 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: C Ecological site: R048AY303CO Other vegetative classification: LOAMY SLOPES (null_31) Hydric soil rating: No Description of Morval Setting Landform:Alluvial fans Down-slope shape:Linear Across-slope shape:Linear Parent material:Alluvium derived from basalt Typical profile H1 - 0 to 7 inches: loam H2 - 7 to 19 inches: clay loam H3 - 19 to 60 inches: loam Properties and qualities Slope:5 to 15 percent Custom Soil Resource Report 33 Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.20 to 0.60 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Calcium carbonate, maximum content:25 percent Maximum salinity:Nonsaline to slightly saline (0.0 to 4.0 mmhos/cm) Available water capacity:High (about 9.3 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soil Group: C Ecological site: R048AY292CO Other vegetative classification: DEEP LOAM (null_11) Hydric soil rating: No Minor Components Other soils Percent of map unit:20 percent Hydric soil rating: No 95—Showalter-Morval complex, 15 to 25 percent slopes Map Unit Setting National map unit symbol: jq7v Elevation: 7,000 to 8,500 feet Mean annual precipitation: 14 to 16 inches Mean annual air temperature: 42 to 44 degrees F Frost-free period: 80 to 90 days Farmland classification: Not prime farmland Map Unit Composition Showalter and similar soils:45 percent Morval and similar soils:35 percent Minor components:20 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Showalter Setting Landform:Alluvial fans, terraces, valley sides Landform position (three-dimensional):Tread Down-slope shape:Linear Across-slope shape:Linear Custom Soil Resource Report 34 Parent material:Alluvium derived from basalt Typical profile H1 - 0 to 8 inches: very stony loam H2 - 8 to 39 inches: very cobbly clay H3 - 39 to 60 inches: very cobbly clay loam Properties and qualities Slope:15 to 25 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat):Moderately low to moderately high (0.06 to 0.20 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Calcium carbonate, maximum content:10 percent Available water capacity:Low (about 5.5 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: C Ecological site: R048AY303CO Other vegetative classification: LOAMY SLOPES (null_31) Hydric soil rating: No Description of Morval Setting Landform:Alluvial fans Down-slope shape:Linear Across-slope shape:Linear Parent material:Alluvium derived from basalt Typical profile H1 - 0 to 7 inches: loam H2 - 7 to 19 inches: clay loam H3 - 19 to 60 inches: loam Properties and qualities Slope:15 to 25 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.20 to 0.60 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Calcium carbonate, maximum content:25 percent Maximum salinity:Nonsaline to slightly saline (0.0 to 4.0 mmhos/cm) Available water capacity:High (about 9.3 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6e Custom Soil Resource Report 35 Hydrologic Soil Group: C Ecological site: R048AY292CO Other vegetative classification: DEEP LOAM (null_11) Hydric soil rating: No Minor Components Other soils Percent of map unit:20 percent Hydric soil rating: No 104—Torriorthents-Camborthids-Rock outcrop complex, 6 to 65 percent Map Unit Setting National map unit symbol: jq4c Elevation: 5,000 to 8,500 feet Mean annual precipitation: 10 to 15 inches Mean annual air temperature: 39 to 46 degrees F Frost-free period: 80 to 105 days Farmland classification: Not prime farmland Map Unit Composition Torriorthents and similar soils:45 percent Camborthids and similar soils:20 percent Rock outcrop:15 percent Minor components:20 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Torriorthents Setting Landform:Mountains, hills, ridges Landform position (two-dimensional):Footslope, backslope Landform position (three-dimensional):Mountainflank, base slope, side slope Down-slope shape:Concave Across-slope shape:Concave Parent material:Colluvium derived from sedimentary rock and/or residuum weathered from sedimentary rock Typical profile H1 - 0 to 4 inches: variable H2 - 4 to 30 inches: gravelly loam H3 - 30 to 34 inches: unweathered bedrock Properties and qualities Slope:6 to 65 percent Depth to restrictive feature:4 to 30 inches to lithic bedrock Drainage class:Well drained Runoff class: High Custom Soil Resource Report 36 Capacity of the most limiting layer to transmit water (Ksat):Moderately low to moderately high (0.06 to 0.20 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Calcium carbonate, maximum content:5 percent Maximum salinity:Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water capacity:Low (about 3.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Hydric soil rating: No Description of Camborthids Setting Landform:Hills, mountains, ridges Landform position (two-dimensional):Footslope, backslope Landform position (three-dimensional):Mountainflank, base slope, side slope Down-slope shape:Linear Across-slope shape:Linear Parent material:Alluvium derived from shale and/or colluvium derived from shale and/or alluvium derived from sandstone and/or colluvium derived from sandstone and/or alluvium derived from basalt and/or colluvium derived from basalt Typical profile H1 - 0 to 4 inches: variable H2 - 4 to 30 inches: clay loam H3 - 30 to 34 inches: unweathered bedrock Properties and qualities Slope:6 to 65 percent Depth to restrictive feature:15 to 60 inches to lithic bedrock Drainage class:Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat):Moderately low to moderately high (0.06 to 0.20 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Calcium carbonate, maximum content:10 percent Gypsum, maximum content:2 percent Maximum salinity:Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water capacity:Low (about 4.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Hydric soil rating: No Custom Soil Resource Report 37 Description of Rock Outcrop Typical profile H1 - 0 to 60 inches: unweathered bedrock Properties and qualities Slope:6 to 65 percent Depth to restrictive feature:0 inches to lithic bedrock Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat):Very low to low (0.00 to 0.00 in/hr) Available water capacity:Very low (about 0.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 8s Hydrologic Soil Group: D Hydric soil rating: No Minor Components Other soils Percent of map unit:20 percent Hydric soil rating: No Custom Soil Resource Report 38 Holy Cross Area, Colorado, Parts of Eagle, Garfield, Mesa, Pitkin, and Summit Counties 104A—Haplocryolls-Cryaquolls complex, 0 to 15 percent slopes Map Unit Setting National map unit symbol: 1jh8f Elevation: 6,990 to 11,640 feet Mean annual precipitation: 20 to 40 inches Mean annual air temperature: 36 to 40 degrees F Frost-free period: 20 to 60 days Farmland classification: Not prime farmland Map Unit Composition Haplocryolls and similar soils:65 percent Cryaquolls and similar soils:30 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Haplocryolls Setting Landform:Stream terraces on mountain valleys Down-slope shape:Linear Across-slope shape:Linear Parent material:Alluvium derived from igneous and sedimentary rock Typical profile A1 - 0 to 2 inches: cobbly silt loam A2 - 2 to 12 inches: silt loam AC - 12 to 20 inches: silt loam C1 - 20 to 47 inches: cobbly silt loam C2 - 47 to 60 inches: cobbly silt loam Properties and qualities Slope:0 to 15 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Moderately high to high (0.71 to 2.13 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.0 mmhos/cm) Available water capacity:Moderate (about 8.2 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6c Hydrologic Soil Group: B Other vegetative classification: Quaking aspen/mountain snowberry (POTR5/ SYOR2) (D0511) Hydric soil rating: No Custom Soil Resource Report 39 Description of Cryaquolls Setting Landform:Flood plains on mountain valleys Down-slope shape:Concave Across-slope shape:Concave Parent material:Alluvium derived from igneous and sedimentary rock Typical profile Oi - 0 to 2 inches: slightly decomposed plant material A - 2 to 13 inches: silt loam Bg - 13 to 22 inches: gravelly sandy clay loam Cg - 22 to 60 inches: clay loam Properties and qualities Slope:0 to 5 percent Depth to restrictive feature:More than 80 inches Drainage class:Very poorly drained Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.21 to 0.71 in/hr) Depth to water table:About 0 to 6 inches Frequency of flooding:NoneFrequent Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.0 mmhos/cm) Available water capacity:High (about 11.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6w Hydrologic Soil Group: C/D Other vegetative classification: Planeleaf willow/water sedge (SAPLP2/CAAQ) (S1405) Hydric soil rating: Yes 220B—Leadville family, till substratum, 5 to 40 percent slopes Map Unit Setting National map unit symbol: 1jh94 Elevation: 8,990 to 10,990 feet Mean annual precipitation: 20 to 40 inches Mean annual air temperature: 36 to 40 degrees F Frost-free period: 20 to 60 days Farmland classification: Not prime farmland Map Unit Composition Leadville family, till substratum, and similar soils:95 percent Estimates are based on observations, descriptions, and transects of the mapunit. Custom Soil Resource Report 40 Description of Leadville Family, Till Substratum Setting Landform:Moraines Down-slope shape:Linear Across-slope shape:Linear Parent material:Till derived from igneous and sedimentary rock Typical profile Oi - 0 to 2 inches: slightly decomposed plant material A1 - 2 to 3 inches: loam A2 - 3 to 9 inches: gravelly silt loam E - 9 to 17 inches: very cobbly silt loam B/E - 17 to 22 inches: very cobbly fine sandy loam Bt1 - 22 to 33 inches: extremely cobbly sandy clay loam Bt2 - 33 to 42 inches: extremely cobbly clay loam C - 42 to 59 inches: very cobbly clay loam Properties and qualities Slope:5 to 40 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.21 to 0.71 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:Low (about 5.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Other vegetative classification: Subalpine fir - Engelmann spruce/myrtle whortleberry (ABLA-PIEN/VAMY2) (C0320) Hydric soil rating: No 226B—Leadville family-Cryaquolls complex, 0 to 25 percent slopes Map Unit Setting National map unit symbol: 1jh9j Elevation: 8,990 to 11,610 feet Mean annual precipitation: 25 to 40 inches Mean annual air temperature: 36 to 40 degrees F Frost-free period: 20 to 60 days Farmland classification: Not prime farmland Map Unit Composition Leadville family and similar soils:65 percent Cryaquolls and similar soils:30 percent Estimates are based on observations, descriptions, and transects of the mapunit. Custom Soil Resource Report 41 Description of Leadville Family Setting Landform:Glacial-valley floors Down-slope shape:Linear Across-slope shape:Linear Parent material:Till derived from igneous and sedimentary rock Typical profile Oi - 0 to 2 inches: slightly decomposed plant material A1 - 2 to 3 inches: loam A2 - 3 to 9 inches: gravelly silt loam E - 9 to 17 inches: very cobbly silt loam B/E - 17 to 22 inches: very cobbly fine sandy loam Bt1 - 22 to 33 inches: extremely cobbly sandy clay loam Bt2 - 33 to 42 inches: extremely cobbly clay loam C - 42 to 59 inches: very cobbly clay loam Properties and qualities Slope:0 to 25 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.21 to 0.71 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:Low (about 5.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6e Hydrologic Soil Group: C Other vegetative classification: Subalpine fir - Engelmann spruce/myrtle whortleberry (ABLA-PIEN/VAMY2) (C0320) Hydric soil rating: No Description of Cryaquolls Setting Landform:Flood plains Down-slope shape:Linear Across-slope shape:Concave Parent material:Alluvium derived from igneous and sedimentary rock Typical profile Oi - 0 to 2 inches: slightly decomposed plant material A - 2 to 13 inches: silt loam Bg - 13 to 22 inches: gravelly sandy clay loam Cg - 22 to 60 inches: clay loam Properties and qualities Slope:0 to 5 percent Depth to restrictive feature:More than 80 inches Drainage class:Very poorly drained Runoff class: Medium Custom Soil Resource Report 42 Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.21 to 0.71 in/hr) Depth to water table:About 0 to 6 inches Frequency of flooding:OccasionalNone Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.0 mmhos/cm) Available water capacity:High (about 11.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 5w Hydrologic Soil Group: C/D Other vegetative classification: Planeleaf willow/water sedge (SAPLP2/CAAQ) (S1405) Hydric soil rating: Yes 313B—Scout family-Rubble land-Seitz family complex, 5 to 40 percent slopes Map Unit Setting National map unit symbol: 1jhbj Elevation: 8,990 to 10,990 feet Mean annual precipitation: 25 to 40 inches Mean annual air temperature: 37 to 40 degrees F Frost-free period: 20 to 60 days Farmland classification: Not prime farmland Map Unit Composition Scout family and similar soils:45 percent Rubble land:30 percent Seitz family and similar soils:20 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Scout Family Setting Landform:Landslides on mountain slopes Down-slope shape:Concave, linear Across-slope shape:Linear Parent material:Colluvium derived from igneous and sedimentary rock Typical profile Oi - 0 to 2 inches: slightly decomposed plant material A - 2 to 9 inches: very cobbly loam Bw1 - 9 to 21 inches: extremely cobbly fine sandy loam Bw2 - 21 to 32 inches: extremely gravelly sandy loam C1 - 32 to 41 inches: extremely gravelly sandy loam C2 - 41 to 59 inches: extremely cobbly sandy loam C3 - 59 to 72 inches: extremely cobbly sandy clay loam Custom Soil Resource Report 43 Properties and qualities Slope:5 to 40 percent Depth to restrictive feature:More than 80 inches Drainage class:Somewhat excessively drained Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.21 to 0.71 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:Low (about 3.2 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: B Other vegetative classification: Subalpine fir - Engelmann spruce/myrtle whortleberry (ABLA-PIEN/VAMY2) (C0320) Hydric soil rating: No Description of Rubble Land Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 8 Hydric soil rating: No Description of Seitz Family Setting Landform:Landslides on mountain slopes Down-slope shape:Concave, linear Across-slope shape:Linear Parent material:Colluvium derived from igneous and metamorphic rock Typical profile Oi - 0 to 1 inches: slightly decomposed plant material A - 1 to 4 inches: stony silt loam B/E - 4 to 19 inches: cobbly silt loam Bt1 - 19 to 24 inches: very cobbly silty clay Bt2 - 24 to 46 inches: very cobbly clay C1 - 46 to 65 inches: extremely stony clay C2 - 65 to 72 inches: extremely cobbly clay Properties and qualities Slope:5 to 40 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Very low to moderately low (0.00 to 0.07 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:Low (about 5.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Custom Soil Resource Report 44 Hydrologic Soil Group: D Other vegetative classification: Subalpine fir - Engelmann spruce/myrtle whortleberry (ABLA-PIEN/VAMY2) (C0320) Hydric soil rating: No 331C—Peeler-Leadville families complex, 40 to 65 percent slopes Map Unit Setting National map unit symbol: 1jhbw Elevation: 8,990 to 10,500 feet Mean annual precipitation: 25 to 40 inches Mean annual air temperature: 36 to 40 degrees F Frost-free period: 20 to 60 days Farmland classification: Not prime farmland Map Unit Composition Peeler family and similar soils:50 percent Leadville family and similar soils:35 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Peeler Family Setting Landform:Landslides on mountain slopes Down-slope shape:Concave, linear Across-slope shape:Linear Parent material:Colluvium derived from igneous and sedimentary rock Typical profile Oi - 0 to 1 inches: slightly decomposed plant material A - 1 to 2 inches: silt loam B/E - 2 to 17 inches: loam Bt - 17 to 46 inches: gravelly clay loam C - 46 to 60 inches: sandy loam Properties and qualities Slope:40 to 65 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.21 to 0.71 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:Moderate (about 8.9 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Custom Soil Resource Report 45 Other vegetative classification: Subalpine fir - Engelmann spruce/elk sedge (ABLA-PIEN/CAGE2) (C0307) Hydric soil rating: No Description of Leadville Family Setting Landform:Landslides on mountain slopes Down-slope shape:Linear, concave Across-slope shape:Linear Parent material:Colluvium derived from igneous and sedimentary rock Typical profile Oi - 0 to 2 inches: slightly decomposed plant material A1 - 2 to 3 inches: loam A2 - 3 to 9 inches: gravelly silt loam E - 9 to 17 inches: very cobbly silt loam B/E - 17 to 22 inches: very cobbly fine sandy loam Bt1 - 22 to 33 inches: extremely cobbly sandy clay loam Bt2 - 33 to 42 inches: extremely cobbly clay loam C - 42 to 59 inches: very cobbly clay loam Properties and qualities Slope:40 to 65 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.21 to 0.71 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:Low (about 5.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Other vegetative classification: Subalpine fir - Engelmann spruce/elk sedge (ABLA-PIEN/CAGE2) (C0307) Hydric soil rating: No 333B—Fughes-Godding families complex, 5 to 40 percent slopes Map Unit Setting National map unit symbol: 1jhc4 Elevation: 6,990 to 9,020 feet Mean annual precipitation: 16 to 20 inches Mean annual air temperature: 40 to 46 degrees F Frost-free period: 70 to 110 days Farmland classification: Not prime farmland Custom Soil Resource Report 46 Map Unit Composition Fughes family and similar soils:60 percent Godding family and similar soils:30 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Fughes Family Setting Landform:Mountain slopes Down-slope shape:Linear Across-slope shape:Concave Parent material:Colluvium and/or slope alluvium derived from sandstone and shale Typical profile Oi - 0 to 2 inches: slightly decomposed plant material A1 - 2 to 6 inches: silt loam A2 - 6 to 19 inches: silty clay loam ABt - 19 to 30 inches: silty clay loam Bt - 30 to 60 inches: clay Properties and qualities Slope:5 to 40 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Moderately low to moderately high (0.07 to 0.21 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.0 mmhos/cm) Available water capacity:High (about 11.8 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Other vegetative classification: Gambel oak/mountain snowberry (QUGA/SYOR2) (S1305) Hydric soil rating: No Description of Godding Family Setting Landform:Mountain slopes Down-slope shape:Concave Across-slope shape:Linear Parent material:Colluvium and/or slope alluvium derived from sandstone and shale Typical profile A - 0 to 5 inches: stony silty clay loam ABt - 5 to 17 inches: cobbly silty clay Bt1 - 17 to 33 inches: very cobbly silty clay loam Bt2 - 33 to 43 inches: very cobbly clay Bt3 - 43 to 57 inches: clay loam Custom Soil Resource Report 47 BC - 57 to 63 inches: very channery loam Properties and qualities Slope:5 to 40 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Moderately low to moderately high (0.07 to 0.21 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.0 mmhos/cm) Available water capacity:Moderate (about 8.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Other vegetative classification: Gambel oak/mountain snowberry (QUGA/SYOR2) (S1305) Hydric soil rating: No 333C—Herm-Kolob families complex, 40 to 65 percent slopes Map Unit Setting National map unit symbol: 1jhc5 Elevation: 6,990 to 9,020 feet Mean annual precipitation: 16 to 20 inches Mean annual air temperature: 40 to 46 degrees F Frost-free period: 70 to 110 days Farmland classification: Not prime farmland Map Unit Composition Herm family and similar soils:60 percent Kolob family and similar soils:30 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Herm Family Setting Landform:Mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium and/or slope alluvium derived from igneous and sedimentary rock Typical profile Oi - 0 to 5 inches: slightly decomposed plant material A - 5 to 13 inches: silt loam Bt1 - 13 to 17 inches: silty clay loam Bt2 - 17 to 33 inches: clay Custom Soil Resource Report 48 BC - 33 to 48 inches: silty clay loam C - 48 to 60 inches: clay loam Properties and qualities Slope:40 to 65 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Very low to moderately low (0.00 to 0.07 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:High (about 11.9 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: D Other vegetative classification: Gambel oak/mountain snowberry (QUGA/SYOR2) (S1305) Hydric soil rating: No Description of Kolob Family Setting Landform:Mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium over residuum weathered from igneous and sedimentary rock Typical profile A1 - 0 to 3 inches: stony silt loam A2 - 3 to 11 inches: very cobbly silty clay loam Bt1 - 11 to 19 inches: very cobbly clay loam Bt2 - 19 to 33 inches: very gravelly clay loam Bt3 - 33 to 50 inches: very cobbly clay loam BCt - 50 to 61 inches: very gravelly sandy loam Cr - 61 to 72 inches: bedrock Properties and qualities Slope:40 to 65 percent Depth to restrictive feature:60 to 72 inches to paralithic bedrock Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Low to moderately high (0.00 to 0.28 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.0 mmhos/cm) Available water capacity:Moderate (about 6.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Custom Soil Resource Report 49 Other vegetative classification: Gambel oak/mountain snowberry (QUGA/SYOR2) (S1305) Hydric soil rating: No 338B—Wetopa-Doughspon-Echemoor families complex, 5 to 40 percent slopes Map Unit Setting National map unit symbol: 1jhcg Elevation: 8,000 to 10,000 feet Mean annual precipitation: 20 to 30 inches Mean annual air temperature: 37 to 40 degrees F Frost-free period: 45 to 75 days Farmland classification: Not prime farmland Map Unit Composition Wetopa family and similar soils:40 percent Doughspon family and similar soils:30 percent Echemoor family and similar soils:20 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Wetopa Family Setting Landform:Landslides on mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium derived from sandstone and shale Typical profile Oi - 0 to 0 inches: slightly decomposed plant material A - 0 to 13 inches: silty clay loam Bt1 - 13 to 17 inches: silty clay loam Bt2 - 17 to 45 inches: silty clay C - 45 to 60 inches: cobbly silty clay loam Properties and qualities Slope:5 to 40 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Very low to moderately low (0.00 to 0.07 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.0 mmhos/cm) Available water capacity:High (about 10.8 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Custom Soil Resource Report 50 Hydrologic Soil Group: D Other vegetative classification: Quaking aspen/mountain snowberry (POTR5/ SYOR2) (D0511) Hydric soil rating: No Description of Doughspon Family Setting Landform:Landslides on mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium derived from sandstone and shale Typical profile Oi - 0 to 0 inches: slightly decomposed plant material A - 0 to 4 inches: loam BA - 4 to 14 inches: cobbly silt loam Bt1 - 14 to 19 inches: very cobbly silty clay loam Bt2 - 19 to 30 inches: very cobbly clay loam C - 30 to 60 inches: very cobbly clay Properties and qualities Slope:5 to 40 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Very low to moderately low (0.00 to 0.07 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.0 mmhos/cm) Available water capacity:Moderate (about 6.5 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: D Other vegetative classification: Quaking aspen/mountain snowberry (POTR5/ SYOR2) (D0511) Hydric soil rating: No Description of Echemoor Family Setting Landform:Landslides on mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium over residuum weathered from shale Typical profile Oi - 0 to 0 inches: slightly decomposed plant material A - 0 to 17 inches: silt loam Bt - 17 to 22 inches: clay loam C - 22 to 34 inches: sandy clay loam Cr - 34 to 60 inches: bedrock Properties and qualities Slope:5 to 40 percent Custom Soil Resource Report 51 Depth to restrictive feature:20 to 40 inches to paralithic bedrock Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Low to moderately high (0.00 to 0.28 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:Moderate (about 6.8 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Other vegetative classification: Quaking aspen/mountain snowberry (POTR5/ SYOR2) (D0511) Hydric soil rating: No 345B—Doughspoon family, 5 to 40 percent slopes Map Unit Setting National map unit symbol: 1jhcw Elevation: 8,000 to 10,500 feet Mean annual precipitation: 20 to 30 inches Mean annual air temperature: 37 to 40 degrees F Frost-free period: 45 to 75 days Farmland classification: Not prime farmland Map Unit Composition Doughspon family and similar soils:90 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Doughspon Family Setting Landform:Landslides on mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium derived from sandstone and shale Typical profile Oi - 0 to 0 inches: slightly decomposed plant material A - 0 to 4 inches: loam BA - 4 to 14 inches: cobbly silt loam Bt1 - 14 to 19 inches: very cobbly silty clay loam Bt2 - 19 to 30 inches: very cobbly clay loam C - 30 to 60 inches: very cobbly clay Properties and qualities Slope:5 to 40 percent Depth to restrictive feature:More than 80 inches Custom Soil Resource Report 52 Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Very low to moderately low (0.00 to 0.07 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.0 mmhos/cm) Available water capacity:Moderate (about 6.5 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: D Other vegetative classification: Quaking aspen/mountain snowberry (POTR5/ SYOR2) (D0511) Hydric soil rating: No 345C—Doughspoon family, 40 to 60 percent slopes Map Unit Setting National map unit symbol: 1jhcx Elevation: 8,000 to 10,500 feet Mean annual precipitation: 20 to 30 inches Mean annual air temperature: 37 to 40 degrees F Frost-free period: 45 to 75 days Farmland classification: Not prime farmland Map Unit Composition Doughspon family and similar soils:90 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Doughspon Family Setting Landform:Landslides on mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium derived from sandstone and shale Typical profile Oi - 0 to 0 inches: slightly decomposed plant material A - 0 to 4 inches: loam BA - 4 to 14 inches: cobbly silt loam Bt1 - 14 to 19 inches: very cobbly silty clay loam Bt2 - 19 to 30 inches: very cobbly clay loam C - 30 to 60 inches: very cobbly clay Properties and qualities Slope:40 to 60 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Custom Soil Resource Report 53 Capacity of the most limiting layer to transmit water (Ksat):Very low to moderately low (0.00 to 0.07 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.0 mmhos/cm) Available water capacity:Moderate (about 6.5 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: D Other vegetative classification: Quaking aspen/mountain snowberry (POTR5/ SYOR2) (D0511) Hydric soil rating: No 354B—Typic Argicryolls-Typic Haplocryalfs complex, 5 to 40 percent slopes Map Unit Setting National map unit symbol: 1jhdj Elevation: 8,500 to 10,500 feet Mean annual precipitation: 20 to 30 inches Mean annual air temperature: 36 to 40 degrees F Frost-free period: 40 to 60 days Farmland classification: Not prime farmland Map Unit Composition Typic argicryolls and similar soils:60 percent Typic haplocryalfs and similar soils:35 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Typic Argicryolls Setting Landform:Mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Slope alluvium and/or colluvium derived from igneous and sedimentary rock Typical profile A - 0 to 14 inches: loam BA - 14 to 22 inches: gravelly sandy loam Bt1 - 22 to 34 inches: extremely stony sandy clay loam Bt2 - 34 to 48 inches: very cobbly sandy clay loam BC - 48 to 60 inches: very cobbly sandy clay loam Properties and qualities Slope:5 to 40 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Custom Soil Resource Report 54 Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.21 to 0.71 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.0 mmhos/cm) Available water capacity:Moderate (about 6.8 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Other vegetative classification: Subalpine fir - Engelmann spruce/myrtle whortleberry (ABLA-PIEN/VAMY2) (C0320) Hydric soil rating: No Description of Typic Haplocryalfs Setting Landform:Mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Slope alluvium and/or colluvium derived from igneous and sedimentary rock Typical profile Oi - 0 to 2 inches: slightly decomposed plant material A1 - 2 to 3 inches: loam A2 - 3 to 9 inches: gravelly silt loam E - 9 to 17 inches: very cobbly silt loam B/E - 17 to 22 inches: very cobbly fine sandy loam Bt1 - 22 to 33 inches: extremely cobbly sandy clay loam Bt2 - 33 to 42 inches: extremely cobbly clay loam C - 42 to 59 inches: very cobbly clay loam Properties and qualities Slope:5 to 40 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.21 to 0.71 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:Low (about 5.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Other vegetative classification: Subalpine fir - Engelmann spruce/myrtle whortleberry (ABLA-PIEN/VAMY2) (C0320) Hydric soil rating: No Custom Soil Resource Report 55 367B—Scout-Leadville families complex, 5 to 40 percent slopes Map Unit Setting National map unit symbol: 1jhdw Elevation: 8,990 to 11,610 feet Mean annual precipitation: 20 to 40 inches Mean annual air temperature: 31 to 40 degrees F Frost-free period: 20 to 60 days Farmland classification: Not prime farmland Map Unit Composition Scout family and similar soils:50 percent Leadville family and similar soils:40 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Scout Family Setting Landform:Mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium derived from igneous and sedimentary rock Typical profile Oi - 0 to 2 inches: slightly decomposed plant material A - 2 to 9 inches: very cobbly loam Bw1 - 9 to 21 inches: extremely cobbly fine sandy loam Bw2 - 21 to 32 inches: extremely gravelly sandy loam C1 - 32 to 41 inches: extremely gravelly sandy loam C2 - 41 to 59 inches: extremely cobbly sandy loam C3 - 59 to 72 inches: extremely cobbly sandy clay loam Properties and qualities Slope:5 to 40 percent Depth to restrictive feature:More than 80 inches Drainage class:Somewhat excessively drained Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.21 to 0.71 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:Low (about 3.2 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: B Other vegetative classification: Subalpine fir - Engelmann spruce/myrtle whortleberry (ABLA-PIEN/VAMY2) (C0320) Hydric soil rating: No Custom Soil Resource Report 56 Description of Leadville Family Setting Landform:Mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium derived from igneous and sedimentary rock Typical profile Oi - 0 to 2 inches: slightly decomposed plant material A1 - 2 to 3 inches: loam A2 - 3 to 9 inches: gravelly silt loam E - 9 to 17 inches: very cobbly silt loam B/E - 17 to 22 inches: very cobbly fine sandy loam Bt1 - 22 to 33 inches: extremely cobbly sandy clay loam Bt2 - 33 to 42 inches: extremely cobbly clay loam C - 42 to 59 inches: very cobbly clay loam Properties and qualities Slope:5 to 40 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.21 to 0.71 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:Low (about 5.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Other vegetative classification: Subalpine fir - Engelmann spruce/myrtle whortleberry (ABLA-PIEN/VAMY2) (C0320) Hydric soil rating: No 420C—Subwell-Duffymont families complex, 40 to 65 percent slopes Map Unit Setting National map unit symbol: 1jhfq Elevation: 6,990 to 9,510 feet Mean annual precipitation: 16 to 25 inches Mean annual air temperature: 40 to 46 degrees F Frost-free period: 70 to 110 days Farmland classification: Not prime farmland Map Unit Composition Subwell family and similar soils:60 percent Duffymont family and similar soils:25 percent Custom Soil Resource Report 57 Estimates are based on observations, descriptions, and transects of the mapunit. Description of Subwell Family Setting Landform:Mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium derived from igneous and sedimentary rock Typical profile Oi - 0 to 2 inches: slightly decomposed plant material A - 2 to 8 inches: bouldery loam BA - 8 to 15 inches: very cobbly loam Bw - 15 to 24 inches: very cobbly loam C1 - 24 to 33 inches: very cobbly sandy clay loam C2 - 33 to 60 inches: sandy clay loam Properties and qualities Slope:40 to 65 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.21 to 0.71 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:Moderate (about 8.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: C Other vegetative classification: Gambel oak/saskatoon serviceberry (QUGA/ AMAL2) (S1301-0) Hydric soil rating: No Description of Duffymont Family Setting Landform:Mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium over residuum weathered from sandstone Typical profile Oi - 0 to 1 inches: slightly decomposed plant material A - 1 to 5 inches: very gravelly fine sandy loam Bw - 5 to 8 inches: very gravelly loam C - 8 to 15 inches: extremely channery loam R - 15 to 60 inches: bedrock Properties and qualities Slope:40 to 65 percent Depth to restrictive feature:10 to 20 inches to lithic bedrock Drainage class:Somewhat excessively drained Capacity of the most limiting layer to transmit water (Ksat):Low to moderately high (0.01 to 0.57 in/hr) Custom Soil Resource Report 58 Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.0 mmhos/cm) Available water capacity:Very low (about 1.3 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: D Other vegetative classification: Gambel oak/saskatoon serviceberry (QUGA/ AMAL2) (S1301-0) Hydric soil rating: No 449C—Tampico-Echemoor-Eyre families complex, 30 to 65 percent slopes Map Unit Setting National map unit symbol: 1jhg3 Elevation: 8,990 to 10,500 feet Mean annual precipitation: 20 to 30 inches Mean annual air temperature: 36 to 40 degrees F Frost-free period: 40 to 75 days Farmland classification: Not prime farmland Map Unit Composition Tampico family and similar soils:50 percent Echemoor family and similar soils:35 percent Eyre family and similar soils:15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Tampico Family Setting Landform:Landslides on mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium over residuum weathered from sandstone Typical profile Oi - 0 to 1 inches: slightly decomposed plant material A1 - 1 to 4 inches: loam A2 - 4 to 14 inches: clay loam Bw - 14 to 19 inches: sandy clay loam C - 19 to 24 inches: sandy clay loam Cr - 24 to 60 inches: bedrock Properties and qualities Slope:30 to 65 percent Depth to restrictive feature:20 to 40 inches to paralithic bedrock Drainage class:Well drained Custom Soil Resource Report 59 Capacity of the most limiting layer to transmit water (Ksat):Low to moderately high (0.00 to 0.28 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:Low (about 4.8 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Other vegetative classification: Quaking aspen/mountain snowberry (POTR5/ SYOR2) (D0511) Hydric soil rating: No Description of Echemoor Family Setting Landform:Landslides on mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium over residuum weathered from shale Typical profile Oi - 0 to 0 inches: slightly decomposed plant material A - 0 to 17 inches: silt loam Bt - 17 to 22 inches: clay loam C - 22 to 34 inches: sandy clay loam Cr - 34 to 60 inches: bedrock Properties and qualities Slope:30 to 65 percent Depth to restrictive feature:20 to 40 inches to paralithic bedrock Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Low to moderately high (0.00 to 0.28 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:Moderate (about 6.8 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Other vegetative classification: Quaking aspen/mountain snowberry (POTR5/ SYOR2) (D0511) Hydric soil rating: No Description of Eyre Family Setting Landform:Landslides on mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium over residuum weathered from sandstone Custom Soil Resource Report 60 Typical profile Oi - 0 to 1 inches: slightly decomposed plant material A - 1 to 6 inches: gravelly loam Bw - 6 to 13 inches: very gravelly loam C - 13 to 17 inches: extremely cobbly sandy clay loam R - 17 to 60 inches: bedrock Properties and qualities Slope:30 to 65 percent Depth to restrictive feature:10 to 20 inches to lithic bedrock Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Low to moderately high (0.01 to 0.57 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:Very low (about 2.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: D Other vegetative classification: Douglas-fir/Gambel oak (PSME/QUGA) (C1214) Hydric soil rating: No 654D—Tolby family-Rock outcrop-Hiwan family complex, 40 to 75 percent slopes Map Unit Setting National map unit symbol: 1jhgn Elevation: 8,990 to 11,810 feet Mean annual precipitation: 20 to 40 inches Mean annual air temperature: 36 to 40 degrees F Frost-free period: 20 to 60 days Farmland classification: Not prime farmland Map Unit Composition Tolby family and similar soils:40 percent Rock outcrop:30 percent Hiwan family and similar soils:20 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Tolby Family Setting Landform:Mountain slopes Down-slope shape:Linear Across-slope shape:Linear Custom Soil Resource Report 61 Parent material:Colluvium derived from igneous and metamorphic rock Typical profile Oi - 0 to 1 inches: slightly decomposed plant material A - 1 to 15 inches: gravelly silt loam Bw - 15 to 26 inches: very cobbly loamy fine sand C - 26 to 60 inches: very cobbly coarse sand Properties and qualities Slope:40 to 75 percent Depth to restrictive feature:More than 80 inches Drainage class:Excessively drained Capacity of the most limiting layer to transmit water (Ksat):Moderately high to high (0.71 to 2.13 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water capacity:Low (about 3.4 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 8 Hydrologic Soil Group: B Other vegetative classification: Subalpine fir - Engelmann spruce/common juniper (ABLA-PIEN/JUCO6) (C0309) Hydric soil rating: No Description of Rock Outcrop Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 8 Hydric soil rating: No Description of Hiwan Family Setting Landform:Mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium over residuum weathered from igneous and metamorphic rock Typical profile Oi - 0 to 1 inches: slightly decomposed plant material A - 1 to 5 inches: very gravelly sandy loam C - 5 to 16 inches: very gravelly loamy sand R - 16 to 60 inches: bedrock Properties and qualities Slope:40 to 75 percent Depth to restrictive feature:10 to 20 inches to lithic bedrock Drainage class:Excessively drained Capacity of the most limiting layer to transmit water (Ksat):Low to moderately high (0.01 to 0.57 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Custom Soil Resource Report 62 Maximum salinity:Nonsaline (0.0 to 1.0 mmhos/cm) Available water capacity:Very low (about 1.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 8 Hydrologic Soil Group: D Other vegetative classification: Subalpine fir - Engelmann spruce/common juniper (ABLA-PIEN/JUCO6) (C0309) Hydric soil rating: No AG9—Ansel-Anvik association, 25 to 45 percent slopes Map Unit Setting National map unit symbol: 1jhhj Elevation: 7,510 to 9,510 feet Mean annual precipitation: 18 to 22 inches Mean annual air temperature: 38 to 40 degrees F Frost-free period: 70 to 80 days Farmland classification: Not prime farmland Map Unit Composition Ansel and similar soils:70 percent Anvik and similar soils:20 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Ansel Setting Landform:Mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium derived from igneous and sedimentary rock Typical profile A - 0 to 23 inches: loam Bt1 - 23 to 48 inches: stony clay loam Bt2 - 48 to 60 inches: clay loam Properties and qualities Slope:25 to 45 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.21 to 0.71 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.0 mmhos/cm) Custom Soil Resource Report 63 Available water capacity:High (about 9.4 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Ecological site: F048AY918CO - Spruce-Fir Woodland Other vegetative classification: Spruce-Fir (null_21) Hydric soil rating: No Description of Anvik Setting Landform:Mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium derived from igneous and sedimentary rock Typical profile A - 0 to 12 inches: loam E - 12 to 18 inches: loam Bt - 18 to 42 inches: cobbly clay loam C - 42 to 60 inches: cobbly clay loam Properties and qualities Slope:25 to 45 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.21 to 0.71 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.0 mmhos/cm) Available water capacity:High (about 9.5 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Ecological site: F048AY918CO - Spruce-Fir Woodland Other vegetative classification: Spruce-Fir (null_21) Hydric soil rating: No AG11—Anvik-Skylick-Sligting association, 25 to 50 percent slopes Map Unit Setting National map unit symbol: 1jhhl Elevation: 7,510 to 9,510 feet Mean annual precipitation: 18 to 22 inches Custom Soil Resource Report 64 Mean annual air temperature: 37 to 40 degrees F Frost-free period: 70 to 80 days Farmland classification: Not prime farmland Map Unit Composition Anvik and similar soils:35 percent Skylick and similar soils:30 percent Sligting and similar soils:25 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Anvik Setting Landform:Mountain slopes Landform position (three-dimensional):Lower third of mountainflank Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium derived from igneous and sedimentary rock Typical profile A - 0 to 12 inches: loam E - 12 to 18 inches: loam Bt - 18 to 42 inches: cobbly clay loam C - 42 to 60 inches: cobbly clay loam Properties and qualities Slope:25 to 50 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.21 to 0.71 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.0 mmhos/cm) Available water capacity:High (about 9.5 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Ecological site: F048AY449CO Hydric soil rating: No Description of Skylick Setting Landform:Mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium derived from igneous and sedimentary rock Typical profile A - 0 to 31 inches: loam Bt1 - 31 to 48 inches: clay loam Bt2 - 48 to 60 inches: gravelly sandy clay loam Custom Soil Resource Report 65 Properties and qualities Slope:25 to 50 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Moderately high (0.21 to 0.71 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.0 mmhos/cm) Available water capacity:High (about 11.2 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Ecological site: F048AY449CO Hydric soil rating: No Description of Sligting Setting Landform:Mountain slopes Down-slope shape:Linear Across-slope shape:Linear Parent material:Colluvium derived from sandstone and/or basalt Typical profile A - 0 to 24 inches: very stony loam BA - 24 to 30 inches: extremely cobbly clay loam Bt1 - 30 to 36 inches: very cobbly clay Bt2 - 36 to 60 inches: very stony clay Properties and qualities Slope:25 to 50 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Very low to moderately low (0.00 to 0.07 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.0 mmhos/cm) Available water capacity:Low (about 5.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: D Ecological site: F048AY449CO Hydric soil rating: No Custom Soil Resource Report 66 Custom Soil Resource Report 67 Soil Information for All Uses Soil Properties and Qualities The Soil Properties and Qualities section includes various soil properties and qualities displayed as thematic maps with a summary table for the soil map units in the selected area of interest. A single value or rating for each map unit is generated by aggregating the interpretive ratings of individual map unit components. This aggregation process is defined for each property or quality. Soil Qualities and Features Soil qualities are behavior and performance attributes that are not directly measured, but are inferred from observations of dynamic conditions and from soil properties. Example soil qualities include natural drainage, and frost action. Soil features are attributes that are not directly part of the soil. Example soil features include slope and depth to restrictive layer. These features can greatly impact the use and management of the soil. Hydrologic Soil Group Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. 68 Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Custom Soil Resource Report 69 70 Custom Soil Resource Report Map—Hydrologic Soil Group 436590043666004367300436800043687004369400436590043666004367300436800043687004369400295300 296000 296700 297400 298100 298800 299500 300200 300900 301600 295300 296000 296700 297400 298100 298800 299500 300200 300900 301600 39° 27' 14'' N 107° 22' 47'' W39° 27' 14'' N107° 18' 16'' W39° 24' 57'' N 107° 22' 47'' W39° 24' 57'' N 107° 18' 16'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 0 1000 2000 4000 6000 Feet 0 400 800 1600 2400 Meters Map Scale: 1:29,700 if printed on A landscape (11" x 8.5") sheet. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons A A/D B B/D C C/D D Not rated or not available Soil Rating Lines A A/D B B/D C C/D D Not rated or not available Soil Rating Points A A/D B B/D C C/D D Not rated or not available Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:24,000. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Aspen-Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties Survey Area Data: Version 11, Jun 5, 2020 Soil Survey Area: Holy Cross Area, Colorado, Parts of Eagle, Garfield, Mesa, Pitkin, and Summit Counties Survey Area Data: Version 3, Jun 11, 2020 Your area of interest (AOI) includes more than one soil survey area. These survey areas may have been mapped at different scales, with a different land use in mind, at different times, or at different levels of detail. This may result in map unit symbols, soil properties, and interpretations that do not completely agree across soil survey area boundaries. Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jul 14, 2010—Nov 1, 2017 Custom Soil Resource Report 71 MAP LEGEND MAP INFORMATION The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Custom Soil Resource Report 72 Table—Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 4 Acree loam, 6 to 12 percent slopes C 183.2 4.0% 9 Ansel-Anvik association, 25 to 45 percent slopes C 47.8 1.1% 10 Anvik-Skylick-Sligting association, 10 to 25 percent slopes C 20.2 0.4% 11 Anvik-Skylick-Sligting association, 25 to 50 percent slopes C 231.3 5.1% 12 Arle-Ansari-Rock outcrop complex, 12 to 50 percent slopes D 14.6 0.3% 18 Cochetopa-Antrobus association, 12 to 25 percent slopes C 37.4 0.8% 19 Cochetopa-Antrobus association, 25 to 50 percent slopes C 30.8 0.7% 42 Fluvaquents, 0 to 10 percent slopes B/D 29.7 0.7% 64 Jerry loam, 25 to 65 percent slopes C 485.5 10.7% 94 Showalter-Morval complex, 5 to 15 percent slopes C 65.4 1.4% 95 Showalter-Morval complex, 15 to 25 percent slopes C 295.1 6.5% 104 Torriorthents- Camborthids-Rock outcrop complex, 6 to 65 percent C 86.8 1.9% Subtotals for Soil Survey Area 1,527.9 33.7% Totals for Area of Interest 4,530.0 100.0% Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 104A Haplocryolls-Cryaquolls complex, 0 to 15 percent slopes B 27.2 0.6% 220B Leadville family, till substratum, 5 to 40 percent slopes C 509.0 11.2% 226B Leadville family- Cryaquolls complex, 0 to 25 percent slopes C 71.4 1.6% Custom Soil Resource Report 73 Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 313B Scout family-Rubble land-Seitz family complex, 5 to 40 percent slopes B 171.6 3.8% 331C Peeler-Leadville families complex, 40 to 65 percent slopes C 49.9 1.1% 333B Fughes-Godding families complex, 5 to 40 percent slopes C 118.4 2.6% 333C Herm-Kolob families complex, 40 to 65 percent slopes D 53.7 1.2% 338B Wetopa-Doughspon- Echemoor families complex, 5 to 40 percent slopes D 702.4 15.5% 345B Doughspoon family, 5 to 40 percent slopes D 369.3 8.2% 345C Doughspoon family, 40 to 60 percent slopes D 7.0 0.2% 354B Typic Argicryolls-Typic Haplocryalfs complex, 5 to 40 percent slopes C 55.2 1.2% 367B Scout-Leadville families complex, 5 to 40 percent slopes B 149.5 3.3% 420C Subwell-Duffymont families complex, 40 to 65 percent slopes C 134.7 3.0% 449C Tampico-Echemoor-Eyre families complex, 30 to 65 percent slopes C 94.3 2.1% 654D Tolby family-Rock outcrop-Hiwan family complex, 40 to 75 percent slopes B 369.0 8.1% AG9 Ansel-Anvik association, 25 to 45 percent slopes C 62.9 1.4% AG11 Anvik-Skylick-Sligting association, 25 to 50 percent slopes C 56.2 1.2% Subtotals for Soil Survey Area 3,001.7 66.3% Totals for Area of Interest 4,530.0 100.0% Rating Options—Hydrologic Soil Group Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Custom Soil Resource Report 74 Tie-break Rule: Higher Custom Soil Resource Report 75 References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31. Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. National Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U.S. Department of Agriculture Handbook 18. http://www.nrcs.usda.gov/wps/portal/ nrcs/detail/national/soils/?cid=nrcs142p2_054262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http:// www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http:// www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1. United States Department of Agriculture, Natural Resources Conservation Service. National forestry manual. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ home/?cid=nrcs142p2_053374 United States Department of Agriculture, Natural Resources Conservation Service. National range and pasture handbook. http://www.nrcs.usda.gov/wps/portal/nrcs/ detail/national/landuse/rangepasture/?cid=stelprdb1043084 76 United States Department of Agriculture, Natural Resources Conservation Service. National soil survey handbook, title 430-VI. http://www.nrcs.usda.gov/wps/portal/ nrcs/detail/soils/scientists/?cid=nrcs142p2_054242 United States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/? cid=nrcs142p2_053624 United States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. U.S. Department of Agriculture Handbook 210. http:// www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_052290.pdf Custom Soil Resource Report 77 Glossary Many of the terms relating to landforms, geology, and geomorphology are defined in more detail in the following National Soil Survey Handbook link: “National Soil Survey Handbook.” ABC soil A soil having an A, a B, and a C horizon. Ablation till Loose, relatively permeable earthy material deposited during the downwasting of nearly static glacial ice, either contained within or accumulated on the surface of the glacier. AC soil A soil having only an A and a C horizon. Commonly, such soil formed in recent alluvium or on steep, rocky slopes. Aeration, soil The exchange of air in soil with air from the atmosphere. The air in a well aerated soil is similar to that in the atmosphere; the air in a poorly aerated soil is considerably higher in carbon dioxide and lower in oxygen. Aggregate, soil Many fine particles held in a single mass or cluster. Natural soil aggregates, such as granules, blocks, or prisms, are called peds. Clods are aggregates produced by tillage or logging. Alkali (sodic) soil A soil having so high a degree of alkalinity (pH 8.5 or higher) or so high a percentage of exchangeable sodium (15 percent or more of the total exchangeable bases), or both, that plant growth is restricted. Alluvial cone A semiconical type of alluvial fan having very steep slopes. It is higher, narrower, and steeper than a fan and is composed of coarser and thicker layers of material deposited by a combination of alluvial episodes and (to a much lesser degree) landslides (debris flow). The coarsest materials tend to be concentrated at the apex of the cone. 78 Alluvial fan A low, outspread mass of loose materials and/or rock material, commonly with gentle slopes. It is shaped like an open fan or a segment of a cone. The material was deposited by a stream at the place where it issues from a narrow mountain valley or upland valley or where a tributary stream is near or at its junction with the main stream. The fan is steepest near its apex, which points upstream, and slopes gently and convexly outward (downstream) with a gradual decrease in gradient. Alluvium Unconsolidated material, such as gravel, sand, silt, clay, and various mixtures of these, deposited on land by running water. Alpha,alpha-dipyridyl A compound that when dissolved in ammonium acetate is used to detect the presence of reduced iron (Fe II) in the soil. A positive reaction implies reducing conditions and the likely presence of redoximorphic features. Animal unit month (AUM) The amount of forage required by one mature cow of approximately 1,000 pounds weight, with or without a calf, for 1 month. Aquic conditions Current soil wetness characterized by saturation, reduction, and redoximorphic features. Argillic horizon A subsoil horizon characterized by an accumulation of illuvial clay. Arroyo The flat-floored channel of an ephemeral stream, commonly with very steep to vertical banks cut in unconsolidated material. It is usually dry but can be transformed into a temporary watercourse or short-lived torrent after heavy rain within the watershed. Aspect The direction toward which a slope faces. Also called slope aspect. Association, soil A group of soils or miscellaneous areas geographically associated in a characteristic repeating pattern and defined and delineated as a single map unit. Available water capacity (available moisture capacity) The capacity of soils to hold water available for use by most plants. It is commonly defined as the difference between the amount of soil water at field moisture capacity and the amount at wilting point. It is commonly expressed as inches of water per inch of soil. The capacity, in inches, in a 60-inch profile or to a limiting layer is expressed as: Custom Soil Resource Report 79 Very low: 0 to 3 Low: 3 to 6 Moderate: 6 to 9 High: 9 to 12 Very high: More than 12 Backslope The position that forms the steepest and generally linear, middle portion of a hillslope. In profile, backslopes are commonly bounded by a convex shoulder above and a concave footslope below. Backswamp A flood-plain landform. Extensive, marshy or swampy, depressed areas of flood plains between natural levees and valley sides or terraces. Badland A landscape that is intricately dissected and characterized by a very fine drainage network with high drainage densities and short, steep slopes and narrow interfluves. Badlands develop on surfaces that have little or no vegetative cover overlying unconsolidated or poorly cemented materials (clays, silts, or sandstones) with, in some cases, soluble minerals, such as gypsum or halite. Bajada A broad, gently inclined alluvial piedmont slope extending from the base of a mountain range out into a basin and formed by the lateral coalescence of a series of alluvial fans. Typically, it has a broadly undulating transverse profile, parallel to the mountain front, resulting from the convexities of component fans. The term is generally restricted to constructional slopes of intermontane basins. Basal area The area of a cross section of a tree, generally referring to the section at breast height and measured outside the bark. It is a measure of stand density, commonly expressed in square feet. Base saturation The degree to which material having cation-exchange properties is saturated with exchangeable bases (sum of Ca, Mg, Na, and K), expressed as a percentage of the total cation-exchange capacity. Base slope (geomorphology) A geomorphic component of hills consisting of the concave to linear (perpendicular to the contour) slope that, regardless of the lateral shape, forms an apron or wedge at the bottom of a hillside dominated by colluvium and slope-wash sediments (for example, slope alluvium). Bedding plane A planar or nearly planar bedding surface that visibly separates each successive layer of stratified sediment or rock (of the same or different lithology) Custom Soil Resource Report 80 from the preceding or following layer; a plane of deposition. It commonly marks a change in the circumstances of deposition and may show a parting, a color difference, a change in particle size, or various combinations of these. The term is commonly applied to any bedding surface, even one that is conspicuously bent or deformed by folding. Bedding system A drainage system made by plowing, grading, or otherwise shaping the surface of a flat field. It consists of a series of low ridges separated by shallow, parallel dead furrows. Bedrock The solid rock that underlies the soil and other unconsolidated material or that is exposed at the surface. Bedrock-controlled topography A landscape where the configuration and relief of the landforms are determined or strongly influenced by the underlying bedrock. Bench terrace A raised, level or nearly level strip of earth constructed on or nearly on a contour, supported by a barrier of rocks or similar material, and designed to make the soil suitable for tillage and to prevent accelerated erosion. Bisequum Two sequences of soil horizons, each of which consists of an illuvial horizon and the overlying eluvial horizons. Blowout (map symbol) A saucer-, cup-, or trough-shaped depression formed by wind erosion on a preexisting dune or other sand deposit, especially in an area of shifting sand or loose soil or where protective vegetation is disturbed or destroyed. The adjoining accumulation of sand derived from the depression, where recognizable, is commonly included. Blowouts are commonly small. Borrow pit (map symbol) An open excavation from which soil and underlying material have been removed, usually for construction purposes. Bottom land An informal term loosely applied to various portions of a flood plain. Boulders Rock fragments larger than 2 feet (60 centimeters) in diameter. Breaks A landscape or tract of steep, rough or broken land dissected by ravines and gullies and marking a sudden change in topography. Custom Soil Resource Report 81 Breast height An average height of 4.5 feet above the ground surface; the point on a tree where diameter measurements are ordinarily taken. Brush management Use of mechanical, chemical, or biological methods to make conditions favorable for reseeding or to reduce or eliminate competition from woody vegetation and thus allow understory grasses and forbs to recover. Brush management increases forage production and thus reduces the hazard of erosion. It can improve the habitat for some species of wildlife. Butte An isolated, generally flat-topped hill or mountain with relatively steep slopes and talus or precipitous cliffs and characterized by summit width that is less than the height of bounding escarpments; commonly topped by a caprock of resistant material and representing an erosion remnant carved from flat-lying rocks. Cable yarding A method of moving felled trees to a nearby central area for transport to a processing facility. Most cable yarding systems involve use of a drum, a pole, and wire cables in an arrangement similar to that of a rod and reel used for fishing. To reduce friction and soil disturbance, felled trees generally are reeled in while one end is lifted or the entire log is suspended. Calcareous soil A soil containing enough calcium carbonate (commonly combined with magnesium carbonate) to effervesce visibly when treated with cold, dilute hydrochloric acid. Caliche A general term for a prominent zone of secondary carbonate accumulation in surficial materials in warm, subhumid to arid areas. Caliche is formed by both geologic and pedologic processes. Finely crystalline calcium carbonate forms a nearly continuous surface-coating and void-filling medium in geologic (parent) materials. Cementation ranges from weak in nonindurated forms to very strong in indurated forms. Other minerals (e.g., carbonates, silicate, and sulfate) may occur as accessory cements. Most petrocalcic horizons and some calcic horizons are caliche. California bearing ratio (CBR) The load-supporting capacity of a soil as compared to that of standard crushed limestone, expressed as a ratio. First standardized in California. A soil having a CBR of 16 supports 16 percent of the load that would be supported by standard crushed limestone, per unit area, with the same degree of distortion. Canopy The leafy crown of trees or shrubs. (See Crown.) Custom Soil Resource Report 82 Canyon A long, deep, narrow valley with high, precipitous walls in an area of high local relief. Capillary water Water held as a film around soil particles and in tiny spaces between particles. Surface tension is the adhesive force that holds capillary water in the soil. Catena A sequence, or “chain,” of soils on a landscape that formed in similar kinds of parent material and under similar climatic conditions but that have different characteristics as a result of differences in relief and drainage. Cation An ion carrying a positive charge of electricity. The common soil cations are calcium, potassium, magnesium, sodium, and hydrogen. Cation-exchange capacity The total amount of exchangeable cations that can be held by the soil, expressed in terms of milliequivalents per 100 grams of soil at neutrality (pH 7.0) or at some other stated pH value. The term, as applied to soils, is synonymous with base-exchange capacity but is more precise in meaning. Catsteps See Terracettes. Cement rock Shaly limestone used in the manufacture of cement. Channery soil material Soil material that has, by volume, 15 to 35 percent thin, flat fragments of sandstone, shale, slate, limestone, or schist as much as 6 inches (15 centimeters) along the longest axis. A single piece is called a channer. Chemical treatment Control of unwanted vegetation through the use of chemicals. Chiseling Tillage with an implement having one or more soil-penetrating points that shatter or loosen hard, compacted layers to a depth below normal plow depth. Cirque A steep-walled, semicircular or crescent-shaped, half-bowl-like recess or hollow, commonly situated at the head of a glaciated mountain valley or high on the side of a mountain. It was produced by the erosive activity of a mountain glacier. It commonly contains a small round lake (tarn). Custom Soil Resource Report 83 Clay As a soil separate, the mineral soil particles less than 0.002 millimeter in diameter. As a soil textural class, soil material that is 40 percent or more clay, less than 45 percent sand, and less than 40 percent silt. Clay depletions See Redoximorphic features. Clay film A thin coating of oriented clay on the surface of a soil aggregate or lining pores or root channels. Synonyms: clay coating, clay skin. Clay spot (map symbol) A spot where the surface texture is silty clay or clay in areas where the surface layer of the soils in the surrounding map unit is sandy loam, loam, silt loam, or coarser. Claypan A dense, compact subsoil layer that contains much more clay than the overlying materials, from which it is separated by a sharply defined boundary. The layer restricts the downward movement of water through the soil. A claypan is commonly hard when dry and plastic and sticky when wet. Climax plant community The stabilized plant community on a particular site. The plant cover reproduces itself and does not change so long as the environment remains the same. Coarse textured soil Sand or loamy sand. Cobble (or cobblestone) A rounded or partly rounded fragment of rock 3 to 10 inches (7.6 to 25 centimeters) in diameter. Cobbly soil material Material that has 15 to 35 percent, by volume, rounded or partially rounded rock fragments 3 to 10 inches (7.6 to 25 centimeters) in diameter. Very cobbly soil material has 35 to 60 percent of these rock fragments, and extremely cobbly soil material has more than 60 percent. COLE (coefficient of linear extensibility) See Linear extensibility. Colluvium Unconsolidated, unsorted earth material being transported or deposited on side slopes and/or at the base of slopes by mass movement (e.g., direct gravitational action) and by local, unconcentrated runoff. Custom Soil Resource Report 84 Complex slope Irregular or variable slope. Planning or establishing terraces, diversions, and other water-control structures on a complex slope is difficult. Complex, soil A map unit of two or more kinds of soil or miscellaneous areas in such an intricate pattern or so small in area that it is not practical to map them separately at the selected scale of mapping. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Concretions See Redoximorphic features. Conglomerate A coarse grained, clastic sedimentary rock composed of rounded or subangular rock fragments more than 2 millimeters in diameter. It commonly has a matrix of sand and finer textured material. Conglomerate is the consolidated equivalent of gravel. Conservation cropping system Growing crops in combination with needed cultural and management practices. In a good conservation cropping system, the soil-improving crops and practices more than offset the effects of the soil-depleting crops and practices. Cropping systems are needed on all tilled soils. Soil-improving practices in a conservation cropping system include the use of rotations that contain grasses and legumes and the return of crop residue to the soil. Other practices include the use of green manure crops of grasses and legumes, proper tillage, adequate fertilization, and weed and pest control. Conservation tillage A tillage system that does not invert the soil and that leaves a protective amount of crop residue on the surface throughout the year. Consistence, soil Refers to the degree of cohesion and adhesion of soil material and its resistance to deformation when ruptured. Consistence includes resistance of soil material to rupture and to penetration; plasticity, toughness, and stickiness of puddled soil material; and the manner in which the soil material behaves when subject to compression. Terms describing consistence are defined in the “Soil Survey Manual.” Contour stripcropping Growing crops in strips that follow the contour. Strips of grass or close-growing crops are alternated with strips of clean-tilled crops or summer fallow. Control section The part of the soil on which classification is based. The thickness varies among different kinds of soil, but for many it is that part of the soil profile between depths of 10 inches and 40 or 80 inches. Custom Soil Resource Report 85 Coprogenous earth (sedimentary peat) A type of limnic layer composed predominantly of fecal material derived from aquatic animals. Corrosion (geomorphology) A process of erosion whereby rocks and soil are removed or worn away by natural chemical processes, especially by the solvent action of running water, but also by other reactions, such as hydrolysis, hydration, carbonation, and oxidation. Corrosion (soil survey interpretations) Soil-induced electrochemical or chemical action that dissolves or weakens concrete or uncoated steel. Cover crop A close-growing crop grown primarily to improve and protect the soil between periods of regular crop production, or a crop grown between trees and vines in orchards and vineyards. Crop residue management Returning crop residue to the soil, which helps to maintain soil structure, organic matter content, and fertility and helps to control erosion. Cropping system Growing crops according to a planned system of rotation and management practices. Cross-slope farming Deliberately conducting farming operations on sloping farmland in such a way that tillage is across the general slope. Crown The upper part of a tree or shrub, including the living branches and their foliage. Cryoturbate A mass of soil or other unconsolidated earthy material moved or disturbed by frost action. It is typically coarser than the underlying material. Cuesta An asymmetric ridge capped by resistant rock layers of slight or moderate dip (commonly less than 15 percent slopes); a type of homocline produced by differential erosion of interbedded resistant and weak rocks. A cuesta has a long, gentle slope on one side (dip slope) that roughly parallels the inclined beds; on the other side, it has a relatively short and steep or clifflike slope (scarp) that cuts through the tilted rocks. Custom Soil Resource Report 86 Culmination of the mean annual increment (CMAI) The average annual increase per acre in the volume of a stand. Computed by dividing the total volume of the stand by its age. As the stand increases in age, the mean annual increment continues to increase until mortality begins to reduce the rate of increase. The point where the stand reaches its maximum annual rate of growth is called the culmination of the mean annual increment. Cutbanks cave The walls of excavations tend to cave in or slough. Decreasers The most heavily grazed climax range plants. Because they are the most palatable, they are the first to be destroyed by overgrazing. Deferred grazing Postponing grazing or resting grazing land for a prescribed period. Delta A body of alluvium having a surface that is fan shaped and nearly flat; deposited at or near the mouth of a river or stream where it enters a body of relatively quiet water, generally a sea or lake. Dense layer A very firm, massive layer that has a bulk density of more than 1.8 grams per cubic centimeter. Such a layer affects the ease of digging and can affect filling and compacting. Depression, closed (map symbol) A shallow, saucer-shaped area that is slightly lower on the landscape than the surrounding area and that does not have a natural outlet for surface drainage. Depth, soil Generally, the thickness of the soil over bedrock. Very deep soils are more than 60 inches deep over bedrock; deep soils, 40 to 60 inches; moderately deep, 20 to 40 inches; shallow, 10 to 20 inches; and very shallow, less than 10 inches. Desert pavement A natural, residual concentration or layer of wind-polished, closely packed gravel, boulders, and other rock fragments mantling a desert surface. It forms where wind action and sheetwash have removed all smaller particles or where rock fragments have migrated upward through sediments to the surface. It typically protects the finer grained underlying material from further erosion. Diatomaceous earth A geologic deposit of fine, grayish siliceous material composed chiefly or entirely of the remains of diatoms. Custom Soil Resource Report 87 Dip slope A slope of the land surface, roughly determined by and approximately conforming to the dip of the underlying bedrock. Diversion (or diversion terrace) A ridge of earth, generally a terrace, built to protect downslope areas by diverting runoff from its natural course. Divided-slope farming A form of field stripcropping in which crops are grown in a systematic arrangement of two strips, or bands, across the slope to reduce the hazard of water erosion. One strip is in a close-growing crop that provides protection from erosion, and the other strip is in a crop that provides less protection from erosion. This practice is used where slopes are not long enough to permit a full stripcropping pattern to be used. Drainage class (natural) Refers to the frequency and duration of wet periods under conditions similar to those under which the soil formed. Alterations of the water regime by human activities, either through drainage or irrigation, are not a consideration unless they have significantly changed the morphology of the soil. Seven classes of natural soil drainage are recognized—excessively drained, somewhat excessively drained, well drained, moderately well drained, somewhat poorly drained, poorly drained, and very poorly drained. These classes are defined in the “Soil Survey Manual.” Drainage, surface Runoff, or surface flow of water, from an area. Drainageway A general term for a course or channel along which water moves in draining an area. A term restricted to relatively small, linear depressions that at some time move concentrated water and either do not have a defined channel or have only a small defined channel. Draw A small stream valley that generally is shallower and more open than a ravine or gulch and that has a broader bottom. The present stream channel may appear inadequate to have cut the drainageway that it occupies. Drift A general term applied to all mineral material (clay, silt, sand, gravel, and boulders) transported by a glacier and deposited directly by or from the ice or transported by running water emanating from a glacier. Drift includes unstratified material (till) that forms moraines and stratified deposits that form outwash plains, eskers, kames, varves, and glaciofluvial sediments. The term is generally applied to Pleistocene glacial deposits in areas that no longer contain glaciers. Custom Soil Resource Report 88 Drumlin A low, smooth, elongated oval hill, mound, or ridge of compact till that has a core of bedrock or drift. It commonly has a blunt nose facing the direction from which the ice approached and a gentler slope tapering in the other direction. The longer axis is parallel to the general direction of glacier flow. Drumlins are products of streamline (laminar) flow of glaciers, which molded the subglacial floor through a combination of erosion and deposition. Duff A generally firm organic layer on the surface of mineral soils. It consists of fallen plant material that is in the process of decomposition and includes everything from the litter on the surface to underlying pure humus. Dune A low mound, ridge, bank, or hill of loose, windblown granular material (generally sand), either barren and capable of movement from place to place or covered and stabilized with vegetation but retaining its characteristic shape. Earthy fill See Mine spoil. Ecological site An area where climate, soil, and relief are sufficiently uniform to produce a distinct natural plant community. An ecological site is the product of all the environmental factors responsible for its development. It is typified by an association of species that differ from those on other ecological sites in kind and/or proportion of species or in total production. Eluviation The movement of material in true solution or colloidal suspension from one place to another within the soil. Soil horizons that have lost material through eluviation are eluvial; those that have received material are illuvial. Endosaturation A type of saturation of the soil in which all horizons between the upper boundary of saturation and a depth of 2 meters are saturated. Eolian deposit Sand-, silt-, or clay-sized clastic material transported and deposited primarily by wind, commonly in the form of a dune or a sheet of sand or loess. Ephemeral stream A stream, or reach of a stream, that flows only in direct response to precipitation. It receives no long-continued supply from melting snow or other source, and its channel is above the water table at all times. Custom Soil Resource Report 89 Episaturation A type of saturation indicating a perched water table in a soil in which saturated layers are underlain by one or more unsaturated layers within 2 meters of the surface. Erosion The wearing away of the land surface by water, wind, ice, or other geologic agents and by such processes as gravitational creep. Erosion (accelerated) Erosion much more rapid than geologic erosion, mainly as a result of human or animal activities or of a catastrophe in nature, such as a fire, that exposes the surface. Erosion (geologic) Erosion caused by geologic processes acting over long geologic periods and resulting in the wearing away of mountains and the building up of such landscape features as flood plains and coastal plains. Synonym: natural erosion. Erosion pavement A surficial lag concentration or layer of gravel and other rock fragments that remains on the soil surface after sheet or rill erosion or wind has removed the finer soil particles and that tends to protect the underlying soil from further erosion. Erosion surface A land surface shaped by the action of erosion, especially by running water. Escarpment A relatively continuous and steep slope or cliff breaking the general continuity of more gently sloping land surfaces and resulting from erosion or faulting. Most commonly applied to cliffs produced by differential erosion. Synonym: scarp. Escarpment, bedrock (map symbol) A relatively continuous and steep slope or cliff, produced by erosion or faulting, that breaks the general continuity of more gently sloping land surfaces. Exposed material is hard or soft bedrock. Escarpment, nonbedrock (map symbol) A relatively continuous and steep slope or cliff, generally produced by erosion but in some places produced by faulting, that breaks the continuity of more gently sloping land surfaces. Exposed earthy material is nonsoil or very shallow soil. Esker A long, narrow, sinuous, steep-sided ridge of stratified sand and gravel deposited as the bed of a stream flowing in an ice tunnel within or below the ice (subglacial) or between ice walls on top of the ice of a wasting glacier and left Custom Soil Resource Report 90 behind as high ground when the ice melted. Eskers range in length from less than a kilometer to more than 160 kilometers and in height from 3 to 30 meters. Extrusive rock Igneous rock derived from deep-seated molten matter (magma) deposited and cooled on the earth’s surface. Fallow Cropland left idle in order to restore productivity through accumulation of moisture. Summer fallow is common in regions of limited rainfall where cereal grain is grown. The soil is tilled for at least one growing season for weed control and decomposition of plant residue. Fan remnant A general term for landforms that are the remaining parts of older fan landforms, such as alluvial fans, that have been either dissected or partially buried. Fertility, soil The quality that enables a soil to provide plant nutrients, in adequate amounts and in proper balance, for the growth of specified plants when light, moisture, temperature, tilth, and other growth factors are favorable. Fibric soil material (peat) The least decomposed of all organic soil material. Peat contains a large amount of well preserved fiber that is readily identifiable according to botanical origin. Peat has the lowest bulk density and the highest water content at saturation of all organic soil material. Field moisture capacity The moisture content of a soil, expressed as a percentage of the ovendry weight, after the gravitational, or free, water has drained away; the field moisture content 2 or 3 days after a soaking rain; also called normal field capacity, normal moisture capacity, or capillary capacity. Fill slope A sloping surface consisting of excavated soil material from a road cut. It commonly is on the downhill side of the road. Fine textured soil Sandy clay, silty clay, or clay. Firebreak An area cleared of flammable material to stop or help control creeping or running fires. It also serves as a line from which to work and to facilitate the movement of firefighters and equipment. Designated roads also serve as firebreaks. Custom Soil Resource Report 91 First bottom An obsolete, informal term loosely applied to the lowest flood-plain steps that are subject to regular flooding. Flaggy soil material Material that has, by volume, 15 to 35 percent flagstones. Very flaggy soil material has 35 to 60 percent flagstones, and extremely flaggy soil material has more than 60 percent flagstones. Flagstone A thin fragment of sandstone, limestone, slate, shale, or (rarely) schist 6 to 15 inches (15 to 38 centimeters) long. Flood plain The nearly level plain that borders a stream and is subject to flooding unless protected artificially. Flood-plain landforms A variety of constructional and erosional features produced by stream channel migration and flooding. Examples include backswamps, flood-plain splays, meanders, meander belts, meander scrolls, oxbow lakes, and natural levees. Flood-plain splay A fan-shaped deposit or other outspread deposit formed where an overloaded stream breaks through a levee (natural or artificial) and deposits its material (commonly coarse grained) on the flood plain. Flood-plain step An essentially flat, terrace-like alluvial surface within a valley that is frequently covered by floodwater from the present stream; any approximately horizontal surface still actively modified by fluvial scour and/or deposition. May occur individually or as a series of steps. Fluvial Of or pertaining to rivers or streams; produced by stream or river action. Foothills A region of steeply sloping hills that fringes a mountain range or high-plateau escarpment. The hills have relief of as much as 1,000 feet (300 meters). Footslope The concave surface at the base of a hillslope. A footslope is a transition zone between upslope sites of erosion and transport (shoulders and backslopes) and downslope sites of deposition (toeslopes). Forb Any herbaceous plant not a grass or a sedge. Custom Soil Resource Report 92 Forest cover All trees and other woody plants (underbrush) covering the ground in a forest. Forest type A stand of trees similar in composition and development because of given physical and biological factors by which it may be differentiated from other stands. Fragipan A loamy, brittle subsurface horizon low in porosity and content of organic matter and low or moderate in clay but high in silt or very fine sand. A fragipan appears cemented and restricts roots. When dry, it is hard or very hard and has a higher bulk density than the horizon or horizons above. When moist, it tends to rupture suddenly under pressure rather than to deform slowly. Genesis, soil The mode of origin of the soil. Refers especially to the processes or soil-forming factors responsible for the formation of the solum, or true soil, from the unconsolidated parent material. Gilgai Commonly, a succession of microbasins and microknolls in nearly level areas or of microvalleys and microridges parallel with the slope. Typically, the microrelief of clayey soils that shrink and swell considerably with changes in moisture content. Glaciofluvial deposits Material moved by glaciers and subsequently sorted and deposited by streams flowing from the melting ice. The deposits are stratified and occur in the form of outwash plains, valley trains, deltas, kames, eskers, and kame terraces. Glaciolacustrine deposits Material ranging from fine clay to sand derived from glaciers and deposited in glacial lakes mainly by glacial meltwater. Many deposits are bedded or laminated. Gleyed soil Soil that formed under poor drainage, resulting in the reduction of iron and other elements in the profile and in gray colors. Graded stripcropping Growing crops in strips that grade toward a protected waterway. Grassed waterway A natural or constructed waterway, typically broad and shallow, seeded to grass as protection against erosion. Conducts surface water away from cropland. Custom Soil Resource Report 93 Gravel Rounded or angular fragments of rock as much as 3 inches (2 millimeters to 7.6 centimeters) in diameter. An individual piece is a pebble. Gravel pit (map symbol) An open excavation from which soil and underlying material have been removed and used, without crushing, as a source of sand or gravel. Gravelly soil material Material that has 15 to 35 percent, by volume, rounded or angular rock fragments, not prominently flattened, as much as 3 inches (7.6 centimeters) in diameter. Gravelly spot (map symbol) A spot where the surface layer has more than 35 percent, by volume, rock fragments that are mostly less than 3 inches in diameter in an area that has less than 15 percent rock fragments. Green manure crop (agronomy) A soil-improving crop grown to be plowed under in an early stage of maturity or soon after maturity. Ground water Water filling all the unblocked pores of the material below the water table. Gully (map symbol) A small, steep-sided channel caused by erosion and cut in unconsolidated materials by concentrated but intermittent flow of water. The distinction between a gully and a rill is one of depth. A gully generally is an obstacle to farm machinery and is too deep to be obliterated by ordinary tillage whereas a rill is of lesser depth and can be smoothed over by ordinary tillage. Hard bedrock Bedrock that cannot be excavated except by blasting or by the use of special equipment that is not commonly used in construction. Hard to reclaim Reclamation is difficult after the removal of soil for construction and other uses. Revegetation and erosion control are extremely difficult. Hardpan A hardened or cemented soil horizon, or layer. The soil material is sandy, loamy, or clayey and is cemented by iron oxide, silica, calcium carbonate, or other substance. Custom Soil Resource Report 94 Head slope (geomorphology) A geomorphic component of hills consisting of a laterally concave area of a hillside, especially at the head of a drainageway. The overland waterflow is converging. Hemic soil material (mucky peat) Organic soil material intermediate in degree of decomposition between the less decomposed fibric material and the more decomposed sapric material. High-residue crops Such crops as small grain and corn used for grain. If properly managed, residue from these crops can be used to control erosion until the next crop in the rotation is established. These crops return large amounts of organic matter to the soil. Hill A generic term for an elevated area of the land surface, rising as much as 1,000 feet above surrounding lowlands, commonly of limited summit area and having a well defined outline. Slopes are generally more than 15 percent. The distinction between a hill and a mountain is arbitrary and may depend on local usage. Hillslope A generic term for the steeper part of a hill between its summit and the drainage line, valley flat, or depression floor at the base of a hill. Horizon, soil A layer of soil, approximately parallel to the surface, having distinct characteristics produced by soil-forming processes. In the identification of soil horizons, an uppercase letter represents the major horizons. Numbers or lowercase letters that follow represent subdivisions of the major horizons. An explanation of the subdivisions is given in the “Soil Survey Manual.” The major horizons of mineral soil are as follows: Custom Soil Resource Report 95 O horizon: An organic layer of fresh and decaying plant residue. L horizon: A layer of organic and mineral limnic materials, including coprogenous earth (sedimentary peat), diatomaceous earth, and marl. A horizon: The mineral horizon at or near the surface in which an accumulation of humified organic matter is mixed with the mineral material. Also, a plowed surface horizon, most of which was originally part of a B horizon. E horizon: The mineral horizon in which the main feature is loss of silicate clay, iron, aluminum, or some combination of these. B horizon: The mineral horizon below an A horizon. The B horizon is in part a layer of transition from the overlying A to the underlying C horizon. The B horizon also has distinctive characteristics, such as (1) accumulation of clay, sesquioxides, humus, or a combination of these; (2) prismatic or blocky structure; (3) redder or browner colors than those in the A horizon; or (4) a combination of these. C horizon: The mineral horizon or layer, excluding indurated bedrock, that is little affected by soil-forming processes and does not have the properties typical of the overlying soil material. The material of a C horizon may be either like or unlike that in which the solum formed. If the material is known to differ from that in the solum, an Arabic numeral, commonly a 2, precedes the letter C. Cr horizon: Soft, consolidated bedrock beneath the soil. R layer: Consolidated bedrock beneath the soil. The bedrock commonly underlies a C horizon, but it can be directly below an A or a B horizon. M layer: A root-limiting subsoil layer consisting of nearly continuous, horizontally oriented, human-manufactured materials. W layer: A layer of water within or beneath the soil. Humus The well decomposed, more or less stable part of the organic matter in mineral soils. Hydrologic soil groups Refers to soils grouped according to their runoff potential. The soil properties that influence this potential are those that affect the minimum rate of water infiltration on a bare soil during periods after prolonged wetting when the soil is not frozen. These properties include depth to a seasonal high water table, the infiltration rate, and depth to a layer that significantly restricts the downward movement of water. The slope and the kind of plant cover are not considered but are separate factors in predicting runoff. Igneous rock Rock that was formed by cooling and solidification of magma and that has not been changed appreciably by weathering since its formation. Major varieties include plutonic and volcanic rock (e.g., andesite, basalt, and granite). Illuviation The movement of soil material from one horizon to another in the soil profile. Generally, material is removed from an upper horizon and deposited in a lower horizon. Custom Soil Resource Report 96 Impervious soil A soil through which water, air, or roots penetrate slowly or not at all. No soil is absolutely impervious to air and water all the time. Increasers Species in the climax vegetation that increase in amount as the more desirable plants are reduced by close grazing. Increasers commonly are the shorter plants and the less palatable to livestock. Infiltration The downward entry of water into the immediate surface of soil or other material, as contrasted with percolation, which is movement of water through soil layers or material. Infiltration capacity The maximum rate at which water can infiltrate into a soil under a given set of conditions. Infiltration rate The rate at which water penetrates the surface of the soil at any given instant, usually expressed in inches per hour. The rate can be limited by the infiltration capacity of the soil or the rate at which water is applied at the surface. Intake rate The average rate of water entering the soil under irrigation. Most soils have a fast initial rate; the rate decreases with application time. Therefore, intake rate for design purposes is not a constant but is a variable depending on the net irrigation application. The rate of water intake, in inches per hour, is expressed as follows: Very low: Less than 0.2 Low: 0.2 to 0.4 Moderately low: 0.4 to 0.75 Moderate: 0.75 to 1.25 Moderately high: 1.25 to 1.75 High: 1.75 to 2.5 Very high: More than 2.5 Interfluve A landform composed of the relatively undissected upland or ridge between two adjacent valleys containing streams flowing in the same general direction. An elevated area between two drainageways that sheds water to those drainageways. Interfluve (geomorphology) A geomorphic component of hills consisting of the uppermost, comparatively level or gently sloping area of a hill; shoulders of backwearing hillslopes can narrow the upland or can merge, resulting in a strongly convex shape. Custom Soil Resource Report 97 Intermittent stream A stream, or reach of a stream, that does not flow year-round but that is commonly dry for 3 or more months out of 12 and whose channel is generally below the local water table. It flows only during wet periods or when it receives ground-water discharge or long, continued contributions from melting snow or other surface and shallow subsurface sources. Invaders On range, plants that encroach into an area and grow after the climax vegetation has been reduced by grazing. Generally, plants invade following disturbance of the surface. Iron depletions See Redoximorphic features. Irrigation Application of water to soils to assist in production of crops. Methods of irrigation are: Basin: Water is applied rapidly to nearly level plains surrounded by levees or dikes. Border: Water is applied at the upper end of a strip in which the lateral flow of water is controlled by small earth ridges called border dikes, or borders. Controlled flooding: Water is released at intervals from closely spaced field ditches and distributed uniformly over the field. Corrugation: Water is applied to small, closely spaced furrows or ditches in fields of close-growing crops or in orchards so that it flows in only one direction. Drip (or trickle): Water is applied slowly and under low pressure to the surface of the soil or into the soil through such applicators as emitters, porous tubing, or perforated pipe. Furrow: Water is applied in small ditches made by cultivation implements. Furrows are used for tree and row crops. Sprinkler: Water is sprayed over the soil surface through pipes or nozzles from a pressure system. Subirrigation: Water is applied in open ditches or tile lines until the water table is raised enough to wet the soil. Wild flooding: Water, released at high points, is allowed to flow onto an area without controlled distribution. Kame A low mound, knob, hummock, or short irregular ridge composed of stratified sand and gravel deposited by a subglacial stream as a fan or delta at the margin of a melting glacier; by a supraglacial stream in a low place or hole on the surface of the glacier; or as a ponded deposit on the surface or at the margin of stagnant ice. Custom Soil Resource Report 98 Karst (topography) A kind of topography that formed in limestone, gypsum, or other soluble rocks by dissolution and that is characterized by closed depressions, sinkholes, caves, and underground drainage. Knoll A small, low, rounded hill rising above adjacent landforms. Ksat See Saturated hydraulic conductivity. Lacustrine deposit Material deposited in lake water and exposed when the water level is lowered or the elevation of the land is raised. Lake plain A nearly level surface marking the floor of an extinct lake filled by well sorted, generally fine textured, stratified deposits, commonly containing varves. Lake terrace A narrow shelf, partly cut and partly built, produced along a lakeshore in front of a scarp line of low cliffs and later exposed when the water level falls. Landfill (map symbol) An area of accumulated waste products of human habitation, either above or below natural ground level. Landslide A general, encompassing term for most types of mass movement landforms and processes involving the downslope transport and outward deposition of soil and rock materials caused by gravitational forces; the movement may or may not involve saturated materials. The speed and distance of movement, as well as the amount of soil and rock material, vary greatly. Large stones Rock fragments 3 inches (7.6 centimeters) or more across. Large stones adversely affect the specified use of the soil. Lava flow (map symbol) A solidified, commonly lobate body of rock formed through lateral, surface outpouring of molten lava from a vent or fissure. Leaching The removal of soluble material from soil or other material by percolating water. Custom Soil Resource Report 99 Levee (map symbol) An embankment that confines or controls water, especially one built along the banks of a river to prevent overflow onto lowlands. Linear extensibility Refers to the change in length of an unconfined clod as moisture content is decreased from a moist to a dry state. Linear extensibility is used to determine the shrink-swell potential of soils. It is an expression of the volume change between the water content of the clod at 1/3- or 1/10-bar tension (33kPa or 10kPa tension) and oven dryness. Volume change is influenced by the amount and type of clay minerals in the soil. The volume change is the percent change for the whole soil. If it is expressed as a fraction, the resulting value is COLE, coefficient of linear extensibility. Liquid limit The moisture content at which the soil passes from a plastic to a liquid state. Loam Soil material that is 7 to 27 percent clay particles, 28 to 50 percent silt particles, and less than 52 percent sand particles. Loess Material transported and deposited by wind and consisting dominantly of silt- sized particles. Low strength The soil is not strong enough to support loads. Low-residue crops Such crops as corn used for silage, peas, beans, and potatoes. Residue from these crops is not adequate to control erosion until the next crop in the rotation is established. These crops return little organic matter to the soil. Marl An earthy, unconsolidated deposit consisting chiefly of calcium carbonate mixed with clay in approximately equal proportions; formed primarily under freshwater lacustrine conditions but also formed in more saline environments. Marsh or swamp (map symbol) A water-saturated, very poorly drained area that is intermittently or permanently covered by water. Sedges, cattails, and rushes are the dominant vegetation in marshes, and trees or shrubs are the dominant vegetation in swamps. Not used in map units where the named soils are poorly drained or very poorly drained. Mass movement A generic term for the dislodgment and downslope transport of soil and rock material as a unit under direct gravitational stress. Custom Soil Resource Report 100 Masses See Redoximorphic features. Meander belt The zone within which migration of a meandering channel occurs; the flood- plain area included between two imaginary lines drawn tangential to the outer bends of active channel loops. Meander scar A crescent-shaped, concave or linear mark on the face of a bluff or valley wall, produced by the lateral erosion of a meandering stream that impinged upon and undercut the bluff. Meander scroll One of a series of long, parallel, close-fitting, crescent-shaped ridges and troughs formed along the inner bank of a stream meander as the channel migrated laterally down-valley and toward the outer bank. Mechanical treatment Use of mechanical equipment for seeding, brush management, and other management practices. Medium textured soil Very fine sandy loam, loam, silt loam, or silt. Mesa A broad, nearly flat topped and commonly isolated landmass bounded by steep slopes or precipitous cliffs and capped by layers of resistant, nearly horizontal rocky material. The summit width is characteristically greater than the height of the bounding escarpments. Metamorphic rock Rock of any origin altered in mineralogical composition, chemical composition, or structure by heat, pressure, and movement at depth in the earth’s crust. Nearly all such rocks are crystalline. Mine or quarry (map symbol) An open excavation from which soil and underlying material have been removed and in which bedrock is exposed. Also denotes surface openings to underground mines. Mine spoil An accumulation of displaced earthy material, rock, or other waste material removed during mining or excavation. Also called earthy fill. Mineral soil Soil that is mainly mineral material and low in organic material. Its bulk density is more than that of organic soil. Custom Soil Resource Report 101 Minimum tillage Only the tillage essential to crop production and prevention of soil damage. Miscellaneous area A kind of map unit that has little or no natural soil and supports little or no vegetation. Miscellaneous water (map symbol) Small, constructed bodies of water that are used for industrial, sanitary, or mining applications and that contain water most of the year. Moderately coarse textured soil Coarse sandy loam, sandy loam, or fine sandy loam. Moderately fine textured soil Clay loam, sandy clay loam, or silty clay loam. Mollic epipedon A thick, dark, humus-rich surface horizon (or horizons) that has high base saturation and pedogenic soil structure. It may include the upper part of the subsoil. Moraine In terms of glacial geology, a mound, ridge, or other topographically distinct accumulation of unsorted, unstratified drift, predominantly till, deposited primarily by the direct action of glacial ice in a variety of landforms. Also, a general term for a landform composed mainly of till (except for kame moraines, which are composed mainly of stratified outwash) that has been deposited by a glacier. Some types of moraines are disintegration, end, ground, kame, lateral, recessional, and terminal. Morphology, soil The physical makeup of the soil, including the texture, structure, porosity, consistence, color, and other physical, mineral, and biological properties of the various horizons, and the thickness and arrangement of those horizons in the soil profile. Mottling, soil Irregular spots of different colors that vary in number and size. Descriptive terms are as follows: abundance—few, common, and many; size—fine, medium, and coarse; and contrast—faint, distinct, and prominent. The size measurements are of the diameter along the greatest dimension. Fine indicates less than 5 millimeters (about 0.2 inch); medium, from 5 to 15 millimeters (about 0.2 to 0.6 inch); and coarse, more than 15 millimeters (about 0.6 inch). Mountain A generic term for an elevated area of the land surface, rising more than 1,000 feet (300 meters) above surrounding lowlands, commonly of restricted summit area (relative to a plateau) and generally having steep sides. A mountain can Custom Soil Resource Report 102 occur as a single, isolated mass or in a group forming a chain or range. Mountains are formed primarily by tectonic activity and/or volcanic action but can also be formed by differential erosion. Muck Dark, finely divided, well decomposed organic soil material. (See Sapric soil material.) Mucky peat See Hemic soil material. Mudstone A blocky or massive, fine grained sedimentary rock in which the proportions of clay and silt are approximately equal. Also, a general term for such material as clay, silt, claystone, siltstone, shale, and argillite and that should be used only when the amounts of clay and silt are not known or cannot be precisely identified. Munsell notation A designation of color by degrees of three simple variables—hue, value, and chroma. For example, a notation of 10YR 6/4 is a color with hue of 10YR, value of 6, and chroma of 4. Natric horizon A special kind of argillic horizon that contains enough exchangeable sodium to have an adverse effect on the physical condition of the subsoil. Neutral soil A soil having a pH value of 6.6 to 7.3. (See Reaction, soil.) Nodules See Redoximorphic features. Nose slope (geomorphology) A geomorphic component of hills consisting of the projecting end (laterally convex area) of a hillside. The overland waterflow is predominantly divergent. Nose slopes consist dominantly of colluvium and slope-wash sediments (for example, slope alluvium). Nutrient, plant Any element taken in by a plant essential to its growth. Plant nutrients are mainly nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, iron, manganese, copper, boron, and zinc obtained from the soil and carbon, hydrogen, and oxygen obtained from the air and water. Organic matter Plant and animal residue in the soil in various stages of decomposition. The content of organic matter in the surface layer is described as follows: Custom Soil Resource Report 103 Very low: Less than 0.5 percent Low: 0.5 to 1.0 percent Moderately low: 1.0 to 2.0 percent Moderate: 2.0 to 4.0 percent High: 4.0 to 8.0 percent Very high: More than 8.0 percent Outwash Stratified and sorted sediments (chiefly sand and gravel) removed or “washed out” from a glacier by meltwater streams and deposited in front of or beyond the end moraine or the margin of a glacier. The coarser material is deposited nearer to the ice. Outwash plain An extensive lowland area of coarse textured glaciofluvial material. An outwash plain is commonly smooth; where pitted, it generally is low in relief. Paleoterrace An erosional remnant of a terrace that retains the surface form and alluvial deposits of its origin but was not emplaced by, and commonly does not grade to, a present-day stream or drainage network. Pan A compact, dense layer in a soil that impedes the movement of water and the growth of roots. For example, hardpan, fragipan, claypan, plowpan, and traffic pan. Parent material The unconsolidated organic and mineral material in which soil forms. Peat Unconsolidated material, largely undecomposed organic matter, that has accumulated under excess moisture. (See Fibric soil material.) Ped An individual natural soil aggregate, such as a granule, a prism, or a block. Pedisediment A layer of sediment, eroded from the shoulder and backslope of an erosional slope, that lies on and is being (or was) transported across a gently sloping erosional surface at the foot of a receding hill or mountain slope. Pedon The smallest volume that can be called “a soil.” A pedon is three dimensional and large enough to permit study of all horizons. Its area ranges from about 10 to 100 square feet (1 square meter to 10 square meters), depending on the variability of the soil. Custom Soil Resource Report 104 Percolation The movement of water through the soil. Perennial water (map symbol) Small, natural or constructed lakes, ponds, or pits that contain water most of the year. Permafrost Ground, soil, or rock that remains at or below 0 degrees C for at least 2 years. It is defined on the basis of temperature and is not necessarily frozen. pH value A numerical designation of acidity and alkalinity in soil. (See Reaction, soil.) Phase, soil A subdivision of a soil series based on features that affect its use and management, such as slope, stoniness, and flooding. Piping Formation of subsurface tunnels or pipelike cavities by water moving through the soil. Pitting Pits caused by melting around ice. They form on the soil after plant cover is removed. Plastic limit The moisture content at which a soil changes from semisolid to plastic. Plasticity index The numerical difference between the liquid limit and the plastic limit; the range of moisture content within which the soil remains plastic. Plateau (geomorphology) A comparatively flat area of great extent and elevation; specifically, an extensive land region that is considerably elevated (more than 100 meters) above the adjacent lower lying terrain, is commonly limited on at least one side by an abrupt descent, and has a flat or nearly level surface. A comparatively large part of a plateau surface is near summit level. Playa The generally dry and nearly level lake plain that occupies the lowest parts of closed depressions, such as those on intermontane basin floors. Temporary flooding occurs primarily in response to precipitation and runoff. Playa deposits are fine grained and may or may not have a high water table and saline conditions. Custom Soil Resource Report 105 Plinthite The sesquioxide-rich, humus-poor, highly weathered mixture of clay with quartz and other diluents. It commonly appears as red mottles, usually in platy, polygonal, or reticulate patterns. Plinthite changes irreversibly to an ironstone hardpan or to irregular aggregates on repeated wetting and drying, especially if it is exposed also to heat from the sun. In a moist soil, plinthite can be cut with a spade. It is a form of laterite. Plowpan A compacted layer formed in the soil directly below the plowed layer. Ponding Standing water on soils in closed depressions. Unless the soils are artificially drained, the water can be removed only by percolation or evapotranspiration. Poorly graded Refers to a coarse grained soil or soil material consisting mainly of particles of nearly the same size. Because there is little difference in size of the particles, density can be increased only slightly by compaction. Pore linings See Redoximorphic features. Potential native plant community See Climax plant community. Potential rooting depth (effective rooting depth) Depth to which roots could penetrate if the content of moisture in the soil were adequate. The soil has no properties restricting the penetration of roots to this depth. Prescribed burning Deliberately burning an area for specific management purposes, under the appropriate conditions of weather and soil moisture and at the proper time of day. Productivity, soil The capability of a soil for producing a specified plant or sequence of plants under specific management. Profile, soil A vertical section of the soil extending through all its horizons and into the parent material. Proper grazing use Grazing at an intensity that maintains enough cover to protect the soil and maintain or improve the quantity and quality of the desirable vegetation. This practice increases the vigor and reproduction capacity of the key plants and Custom Soil Resource Report 106 promotes the accumulation of litter and mulch necessary to conserve soil and water. Rangeland Land on which the potential natural vegetation is predominantly grasses, grasslike plants, forbs, or shrubs suitable for grazing or browsing. It includes natural grasslands, savannas, many wetlands, some deserts, tundras, and areas that support certain forb and shrub communities. Reaction, soil A measure of acidity or alkalinity of a soil, expressed as pH values. A soil that tests to pH 7.0 is described as precisely neutral in reaction because it is neither acid nor alkaline. The degrees of acidity or alkalinity, expressed as pH values, are: Ultra acid: Less than 3.5 Extremely acid: 3.5 to 4.4 Very strongly acid: 4.5 to 5.0 Strongly acid: 5.1 to 5.5 Moderately acid: 5.6 to 6.0 Slightly acid: 6.1 to 6.5 Neutral: 6.6 to 7.3 Slightly alkaline: 7.4 to 7.8 Moderately alkaline: 7.9 to 8.4 Strongly alkaline: 8.5 to 9.0 Very strongly alkaline: 9.1 and higher Red beds Sedimentary strata that are mainly red and are made up largely of sandstone and shale. Redoximorphic concentrations See Redoximorphic features. Redoximorphic depletions See Redoximorphic features. Redoximorphic features Redoximorphic features are associated with wetness and result from alternating periods of reduction and oxidation of iron and manganese compounds in the soil. Reduction occurs during saturation with water, and oxidation occurs when the soil is not saturated. Characteristic color patterns are created by these processes. The reduced iron and manganese ions may be removed from a soil if vertical or lateral fluxes of water occur, in which case there is no iron or manganese precipitation in that soil. Wherever the iron and manganese are oxidized and precipitated, they form either soft masses or hard concretions or nodules. Movement of iron and manganese as a result of redoximorphic processes in a soil may result in redoximorphic features that are defined as follows: Custom Soil Resource Report 107 1.Redoximorphic concentrations.—These are zones of apparent accumulation of iron-manganese oxides, including: A.Nodules and concretions, which are cemented bodies that can be removed from the soil intact. Concretions are distinguished from nodules on the basis of internal organization. A concretion typically has concentric layers that are visible to the naked eye. Nodules do not have visible organized internal structure; and B.Masses, which are noncemented concentrations of substances within the soil matrix; and C.Pore linings, i.e., zones of accumulation along pores that may be either coatings on pore surfaces or impregnations from the matrix adjacent to the pores. 2.Redoximorphic depletions.—These are zones of low chroma (chromas less than those in the matrix) where either iron-manganese oxides alone or both iron-manganese oxides and clay have been stripped out, including: A.Iron depletions, i.e., zones that contain low amounts of iron and manganese oxides but have a clay content similar to that of the adjacent matrix; and B.Clay depletions, i.e., zones that contain low amounts of iron, manganese, and clay (often referred to as silt coatings or skeletans). 3.Reduced matrix.—This is a soil matrix that has low chroma in situ but undergoes a change in hue or chroma within 30 minutes after the soil material has been exposed to air. Reduced matrix See Redoximorphic features. Regolith All unconsolidated earth materials above the solid bedrock. It includes material weathered in place from all kinds of bedrock and alluvial, glacial, eolian, lacustrine, and pyroclastic deposits. Relief The relative difference in elevation between the upland summits and the lowlands or valleys of a given region. Residuum (residual soil material) Unconsolidated, weathered or partly weathered mineral material that accumulated as bedrock disintegrated in place. Rill A very small, steep-sided channel resulting from erosion and cut in unconsolidated materials by concentrated but intermittent flow of water. A rill generally is not an obstacle to wheeled vehicles and is shallow enough to be smoothed over by ordinary tillage. Custom Soil Resource Report 108 Riser The vertical or steep side slope (e.g., escarpment) of terraces, flood-plain steps, or other stepped landforms; commonly a recurring part of a series of natural, steplike landforms, such as successive stream terraces. Road cut A sloping surface produced by mechanical means during road construction. It is commonly on the uphill side of the road. Rock fragments Rock or mineral fragments having a diameter of 2 millimeters or more; for example, pebbles, cobbles, stones, and boulders. Rock outcrop (map symbol) An exposure of bedrock at the surface of the earth. Not used where the named soils of the surrounding map unit are shallow over bedrock or where “Rock outcrop” is a named component of the map unit. Root zone The part of the soil that can be penetrated by plant roots. Runoff The precipitation discharged into stream channels from an area. The water that flows off the surface of the land without sinking into the soil is called surface runoff. Water that enters the soil before reaching surface streams is called ground-water runoff or seepage flow from ground water. Saline soil A soil containing soluble salts in an amount that impairs growth of plants. A saline soil does not contain excess exchangeable sodium. Saline spot (map symbol) An area where the surface layer has an electrical conductivity of 8 mmhos/cm more than the surface layer of the named soils in the surrounding map unit. The surface layer of the surrounding soils has an electrical conductivity of 2 mmhos/cm or less. Sand As a soil separate, individual rock or mineral fragments from 0.05 millimeter to 2.0 millimeters in diameter. Most sand grains consist of quartz. As a soil textural class, a soil that is 85 percent or more sand and not more than 10 percent clay. Sandstone Sedimentary rock containing dominantly sand-sized particles. Custom Soil Resource Report 109 Sandy spot (map symbol) A spot where the surface layer is loamy fine sand or coarser in areas where the surface layer of the named soils in the surrounding map unit is very fine sandy loam or finer. Sapric soil material (muck) The most highly decomposed of all organic soil material. Muck has the least amount of plant fiber, the highest bulk density, and the lowest water content at saturation of all organic soil material. Saturated hydraulic conductivity (Ksat) The ease with which pores of a saturated soil transmit water. Formally, the proportionality coefficient that expresses the relationship of the rate of water movement to hydraulic gradient in Darcy’s Law, a law that describes the rate of water movement through porous media. Commonly abbreviated as “Ksat.” Terms describing saturated hydraulic conductivity are: Very high: 100 or more micrometers per second (14.17 or more inches per hour) High: 10 to 100 micrometers per second (1.417 to 14.17 inches per hour) Moderately high: 1 to 10 micrometers per second (0.1417 inch to 1.417 inches per hour) Moderately low: 0.1 to 1 micrometer per second (0.01417 to 0.1417 inch per hour) Low: 0.01 to 0.1 micrometer per second (0.001417 to 0.01417 inch per hour) Very low: Less than 0.01 micrometer per second (less than 0.001417 inch per hour). To convert inches per hour to micrometers per second, multiply inches per hour by 7.0572. To convert micrometers per second to inches per hour, multiply micrometers per second by 0.1417. Saturation Wetness characterized by zero or positive pressure of the soil water. Under conditions of saturation, the water will flow from the soil matrix into an unlined auger hole. Scarification The act of abrading, scratching, loosening, crushing, or modifying the surface to increase water absorption or to provide a more tillable soil. Sedimentary rock A consolidated deposit of clastic particles, chemical precipitates, or organic remains accumulated at or near the surface of the earth under normal low temperature and pressure conditions. Sedimentary rocks include consolidated equivalents of alluvium, colluvium, drift, and eolian, lacustrine, and marine deposits. Examples are sandstone, siltstone, mudstone, claystone, shale, conglomerate, limestone, dolomite, and coal. Custom Soil Resource Report 110 Sequum A sequence consisting of an illuvial horizon and the overlying eluvial horizon. (See Eluviation.) Series, soil A group of soils that have profiles that are almost alike, except for differences in texture of the surface layer. All the soils of a series have horizons that are similar in composition, thickness, and arrangement. Severely eroded spot (map symbol) An area where, on the average, 75 percent or more of the original surface layer has been lost because of accelerated erosion. Not used in map units in which “severely eroded,” “very severely eroded,” or “gullied” is part of the map unit name. Shale Sedimentary rock that formed by the hardening of a deposit of clay, silty clay, or silty clay loam and that has a tendency to split into thin layers. Sheet erosion The removal of a fairly uniform layer of soil material from the land surface by the action of rainfall and surface runoff. Short, steep slope (map symbol) A narrow area of soil having slopes that are at least two slope classes steeper than the slope class of the surrounding map unit. Shoulder The convex, erosional surface near the top of a hillslope. A shoulder is a transition from summit to backslope. Shrink-swell The shrinking of soil when dry and the swelling when wet. Shrinking and swelling can damage roads, dams, building foundations, and other structures. It can also damage plant roots. Shrub-coppice dune A small, streamlined dune that forms around brush and clump vegetation. Side slope (geomorphology) A geomorphic component of hills consisting of a laterally planar area of a hillside. The overland waterflow is predominantly parallel. Side slopes are dominantly colluvium and slope-wash sediments. Silica A combination of silicon and oxygen. The mineral form is called quartz. Custom Soil Resource Report 111 Silica-sesquioxide ratio The ratio of the number of molecules of silica to the number of molecules of alumina and iron oxide. The more highly weathered soils or their clay fractions in warm-temperate, humid regions, and especially those in the tropics, generally have a low ratio. Silt As a soil separate, individual mineral particles that range in diameter from the upper limit of clay (0.002 millimeter) to the lower limit of very fine sand (0.05 millimeter). As a soil textural class, soil that is 80 percent or more silt and less than 12 percent clay. Siltstone An indurated silt having the texture and composition of shale but lacking its fine lamination or fissility; a massive mudstone in which silt predominates over clay. Similar soils Soils that share limits of diagnostic criteria, behave and perform in a similar manner, and have similar conservation needs or management requirements for the major land uses in the survey area. Sinkhole (map symbol) A closed, circular or elliptical depression, commonly funnel shaped, characterized by subsurface drainage and formed either by dissolution of the surface of underlying bedrock (e.g., limestone, gypsum, or salt) or by collapse of underlying caves within bedrock. Complexes of sinkholes in carbonate-rock terrain are the main components of karst topography. Site index A designation of the quality of a forest site based on the height of the dominant stand at an arbitrarily chosen age. For example, if the average height attained by dominant and codominant trees in a fully stocked stand at the age of 50 years is 75 feet, the site index is 75. Slickensides (pedogenic) Grooved, striated, and/or glossy (shiny) slip faces on structural peds, such as wedges; produced by shrink-swell processes, most commonly in soils that have a high content of expansive clays. Slide or slip (map symbol) A prominent landform scar or ridge caused by fairly recent mass movement or descent of earthy material resulting from failure of earth or rock under shear stress along one or several surfaces. Slope The inclination of the land surface from the horizontal. Percentage of slope is the vertical distance divided by horizontal distance, then multiplied by 100. Thus, a slope of 20 percent is a drop of 20 feet in 100 feet of horizontal distance. Custom Soil Resource Report 112 Slope alluvium Sediment gradually transported down the slopes of mountains or hills primarily by nonchannel alluvial processes (i.e., slope-wash processes) and characterized by particle sorting. Lateral particle sorting is evident on long slopes. In a profile sequence, sediments may be distinguished by differences in size and/or specific gravity of rock fragments and may be separated by stone lines. Burnished peds and sorting of rounded or subrounded pebbles or cobbles distinguish these materials from unsorted colluvial deposits. Slow refill The slow filling of ponds, resulting from restricted water transmission in the soil. Slow water movement Restricted downward movement of water through the soil. See Saturated hydraulic conductivity. Sodic (alkali) soil A soil having so high a degree of alkalinity (pH 8.5 or higher) or so high a percentage of exchangeable sodium (15 percent or more of the total exchangeable bases), or both, that plant growth is restricted. Sodic spot (map symbol) An area where the surface layer has a sodium adsorption ratio that is at least 10 more than that of the surface layer of the named soils in the surrounding map unit. The surface layer of the surrounding soils has a sodium adsorption ratio of 5 or less. Sodicity The degree to which a soil is affected by exchangeable sodium. Sodicity is expressed as a sodium adsorption ratio (SAR) of a saturation extract, or the ratio of Na+ to Ca++ + Mg++. The degrees of sodicity and their respective ratios are: Slight: Less than 13:1 Moderate: 13-30:1 Strong: More than 30:1 Sodium adsorption ratio (SAR) A measure of the amount of sodium (Na) relative to calcium (Ca) and magnesium (Mg) in the water extract from saturated soil paste. It is the ratio of the Na concentration divided by the square root of one-half of the Ca + Mg concentration. Soft bedrock Bedrock that can be excavated with trenching machines, backhoes, small rippers, and other equipment commonly used in construction. Custom Soil Resource Report 113 Soil A natural, three-dimensional body at the earth’s surface. It is capable of supporting plants and has properties resulting from the integrated effect of climate and living matter acting on earthy parent material, as conditioned by relief and by the passage of time. Soil separates Mineral particles less than 2 millimeters in equivalent diameter and ranging between specified size limits. The names and sizes, in millimeters, of separates recognized in the United States are as follows: Very coarse sand: 2.0 to 1.0 Coarse sand: 1.0 to 0.5 Medium sand: 0.5 to 0.25 Fine sand: 0.25 to 0.10 Very fine sand: 0.10 to 0.05 Silt: 0.05 to 0.002 Clay: Less than 0.002 Solum The upper part of a soil profile, above the C horizon, in which the processes of soil formation are active. The solum in soil consists of the A, E, and B horizons. Generally, the characteristics of the material in these horizons are unlike those of the material below the solum. The living roots and plant and animal activities are largely confined to the solum. Spoil area (map symbol) A pile of earthy materials, either smoothed or uneven, resulting from human activity. Stone line In a vertical cross section, a line formed by scattered fragments or a discrete layer of angular and subangular rock fragments (commonly a gravel- or cobble- sized lag concentration) that formerly was draped across a topographic surface and was later buried by additional sediments. A stone line generally caps material that was subject to weathering, soil formation, and erosion before burial. Many stone lines seem to be buried erosion pavements, originally formed by sheet and rill erosion across the land surface. Stones Rock fragments 10 to 24 inches (25 to 60 centimeters) in diameter if rounded or 15 to 24 inches (38 to 60 centimeters) in length if flat. Stony Refers to a soil containing stones in numbers that interfere with or prevent tillage. Custom Soil Resource Report 114 Stony spot (map symbol) A spot where 0.01 to 0.1 percent of the soil surface is covered by rock fragments that are more than 10 inches in diameter in areas where the surrounding soil has no surface stones. Strath terrace A type of stream terrace; formed as an erosional surface cut on bedrock and thinly mantled with stream deposits (alluvium). Stream terrace One of a series of platforms in a stream valley, flanking and more or less parallel to the stream channel, originally formed near the level of the stream; represents the remnants of an abandoned flood plain, stream bed, or valley floor produced during a former state of fluvial erosion or deposition. Stripcropping Growing crops in a systematic arrangement of strips or bands that provide vegetative barriers to wind erosion and water erosion. Structure, soil The arrangement of primary soil particles into compound particles or aggregates. The principal forms of soil structure are: Platy: Flat and laminated Prismatic: Vertically elongated and having flat tops Columnar: Vertically elongated and having rounded tops Angular blocky: Having faces that intersect at sharp angles (planes) Subangular blocky: Having subrounded and planar faces (no sharp angles) Granular: Small structural units with curved or very irregular faces Structureless soil horizons are defined as follows: Single grained: Entirely noncoherent (each grain by itself), as in loose sand Massive: Occurring as a coherent mass Stubble mulch Stubble or other crop residue left on the soil or partly worked into the soil. It protects the soil from wind erosion and water erosion after harvest, during preparation of a seedbed for the next crop, and during the early growing period of the new crop. Subsoil Technically, the B horizon; roughly, the part of the solum below plow depth. Subsoiling Tilling a soil below normal plow depth, ordinarily to shatter a hardpan or claypan. Custom Soil Resource Report 115 Substratum The part of the soil below the solum. Subsurface layer Any surface soil horizon (A, E, AB, or EB) below the surface layer. Summer fallow The tillage of uncropped land during the summer to control weeds and allow storage of moisture in the soil for the growth of a later crop. A practice common in semiarid regions, where annual precipitation is not enough to produce a crop every year. Summer fallow is frequently practiced before planting winter grain. Summit The topographically highest position of a hillslope. It has a nearly level (planar or only slightly convex) surface. Surface layer The soil ordinarily moved in tillage, or its equivalent in uncultivated soil, ranging in depth from 4 to 10 inches (10 to 25 centimeters). Frequently designated as the “plow layer,” or the “Ap horizon.” Surface soil The A, E, AB, and EB horizons, considered collectively. It includes all subdivisions of these horizons. Talus Rock fragments of any size or shape (commonly coarse and angular) derived from and lying at the base of a cliff or very steep rock slope. The accumulated mass of such loose broken rock formed chiefly by falling, rolling, or sliding. Taxadjuncts Soils that cannot be classified in a series recognized in the classification system. Such soils are named for a series they strongly resemble and are designated as taxadjuncts to that series because they differ in ways too small to be of consequence in interpreting their use and behavior. Soils are recognized as taxadjuncts only when one or more of their characteristics are slightly outside the range defined for the family of the series for which the soils are named. Terminal moraine An end moraine that marks the farthest advance of a glacier. It typically has the form of a massive arcuate or concentric ridge, or complex of ridges, and is underlain by till and other types of drift. Terrace (conservation) An embankment, or ridge, constructed across sloping soils on the contour or at a slight angle to the contour. The terrace intercepts surface runoff so that water soaks into the soil or flows slowly to a prepared outlet. A terrace in a field Custom Soil Resource Report 116 generally is built so that the field can be farmed. A terrace intended mainly for drainage has a deep channel that is maintained in permanent sod. Terrace (geomorphology) A steplike surface, bordering a valley floor or shoreline, that represents the former position of a flood plain, lake, or seashore. The term is usually applied both to the relatively flat summit surface (tread) that was cut or built by stream or wave action and to the steeper descending slope (scarp or riser) that has graded to a lower base level of erosion. Terracettes Small, irregular steplike forms on steep hillslopes, especially in pasture, formed by creep or erosion of surficial materials that may be induced or enhanced by trampling of livestock, such as sheep or cattle. Texture, soil The relative proportions of sand, silt, and clay particles in a mass of soil. The basic textural classes, in order of increasing proportion of fine particles, are sand, loamy sand, sandy loam, loam, silt loam, silt, sandy clay loam, clay loam, silty clay loam, sandy clay, silty clay, and clay. The sand, loamy sand, and sandy loam classes may be further divided by specifying “coarse,” “fine,” or “very fine.” Thin layer Otherwise suitable soil material that is too thin for the specified use. Till Dominantly unsorted and nonstratified drift, generally unconsolidated and deposited directly by a glacier without subsequent reworking by meltwater, and consisting of a heterogeneous mixture of clay, silt, sand, gravel, stones, and boulders; rock fragments of various lithologies are embedded within a finer matrix that can range from clay to sandy loam. Till plain An extensive area of level to gently undulating soils underlain predominantly by till and bounded at the distal end by subordinate recessional or end moraines. Tilth, soil The physical condition of the soil as related to tillage, seedbed preparation, seedling emergence, and root penetration. Toeslope The gently inclined surface at the base of a hillslope. Toeslopes in profile are commonly gentle and linear and are constructional surfaces forming the lower part of a hillslope continuum that grades to valley or closed-depression floors. Custom Soil Resource Report 117 Topsoil The upper part of the soil, which is the most favorable material for plant growth. It is ordinarily rich in organic matter and is used to topdress roadbanks, lawns, and land affected by mining. Trace elements Chemical elements, for example, zinc, cobalt, manganese, copper, and iron, in soils in extremely small amounts. They are essential to plant growth. Tread The flat to gently sloping, topmost, laterally extensive slope of terraces, flood- plain steps, or other stepped landforms; commonly a recurring part of a series of natural steplike landforms, such as successive stream terraces. Tuff A generic term for any consolidated or cemented deposit that is 50 percent or more volcanic ash. Upland An informal, general term for the higher ground of a region, in contrast with a low-lying adjacent area, such as a valley or plain, or for land at a higher elevation than the flood plain or low stream terrace; land above the footslope zone of the hillslope continuum. Valley fill The unconsolidated sediment deposited by any agent (water, wind, ice, or mass wasting) so as to fill or partly fill a valley. Variegation Refers to patterns of contrasting colors assumed to be inherited from the parent material rather than to be the result of poor drainage. Varve A sedimentary layer or a lamina or sequence of laminae deposited in a body of still water within a year. Specifically, a thin pair of graded glaciolacustrine layers seasonally deposited, usually by meltwater streams, in a glacial lake or other body of still water in front of a glacier. Very stony spot (map symbol) A spot where 0.1 to 3.0 percent of the soil surface is covered by rock fragments that are more than 10 inches in diameter in areas where the surface of the surrounding soil is covered by less than 0.01 percent stones. Water bars Smooth, shallow ditches or depressional areas that are excavated at an angle across a sloping road. They are used to reduce the downward velocity of water and divert it off and away from the road surface. Water bars can easily be driven over if constructed properly. Custom Soil Resource Report 118 Weathering All physical disintegration, chemical decomposition, and biologically induced changes in rocks or other deposits at or near the earth’s surface by atmospheric or biologic agents or by circulating surface waters but involving essentially no transport of the altered material. Well graded Refers to soil material consisting of coarse grained particles that are well distributed over a wide range in size or diameter. Such soil normally can be easily increased in density and bearing properties by compaction. Contrasts with poorly graded soil. Wet spot (map symbol) A somewhat poorly drained to very poorly drained area that is at least two drainage classes wetter than the named soils in the surrounding map unit. Wilting point (or permanent wilting point) The moisture content of soil, on an ovendry basis, at which a plant (specifically a sunflower) wilts so much that it does not recover when placed in a humid, dark chamber. Windthrow The uprooting and tipping over of trees by the wind. Custom Soil Resource Report 119 H:\03385\2020\Design\ECP\OMR ‐ Filing 4 ‐ Phase 3 Preliminary Construction Management Plan ‐ 20220114.doc OAK MEADOWS RANCH FILING 4 - PHASE 3 IMPROVEMENTS Garfield County, Colorado PRELIMINARY CONSTRUCTION MANAGEMENT PLAN Owner: Oak Meadows, Filing 4, Phase 3 LLC Gary Johnson, Manager 320 Big Pinion Drive Basalt, Colorado 81621 Phone: (970) 379‐3632 Prepared By: Gamba & Associates, Inc. 1001 Grand Avenue, Suite 003 Glenwood Springs, Colorado 81601 (970) 945‐2550 Michael J. Gamba, P.E. 28036 January 14, 2022 Oak Meadows Ranch – Filing 4 – Phase 2 Preliminary Construction Management Plan Oak Meadows Ranch – Filing 4 – Phase 3 – Preliminary Construction Management Plan Page 2 Reclamation and Revegetation Plan Table of Contents Page INTRODUCTION:....................................................................................................................................... 5  Project Location: ..................................................................................................................................................... 5  Project Description: ............................................................................................................................................... 5  Project Owner: ......................................................................................................................................................... 5  Project Contractor: ................................................................................................................................................. 5  PROJECT IMPLEMENTATION: .............................................................................................................. 5  Estimated Dates of Construction:..................................................................................................................... 5  Hours of Construction: ......................................................................................................................................... 5  Construction Phasing: ........................................................................................................................................... 5  Construction Plans: ................................................................................................................................................ 5  Construction Specifications: ............................................................................................................................... 6  PROJECT MANAGEMENT: ...................................................................................................................... 6  Areas of Disturbance ............................................................................................................................................. 6  Proposed BMPs (Best Management Practices) .......................................................................................... 6  Construction Parking ............................................................................................................................................ 6  Material and Equipment Storage ..................................................................................................................... 6  Construction Staging ............................................................................................................................................. 6  Emergency Vehicle Access: ................................................................................................................................. 6  TRAFFIC CONTROL .................................................................................................................................. 6  Construction Access ............................................................................................................................................... 6  Weight and Dimensions of Construction Vehicles .................................................................................... 6  Delivery of Construction Equipment and Materials ................................................................................. 7  SEDIMENT AND EROSION CONTROL ................................................................................................. 7  Best Management Practices (BMPs) ............................................................................................................... 7  Fugitive Dust Control ............................................................................................................................................ 7  VEHCILE EMISSIONS ............................................................................................................................... 7  General ........................................................................................................................................................................ 7  NOISE SUPPRESSION ............................................................................................................................... 7  General ........................................................................................................................................................................ 7  Noise Controls .......................................................................................................................................................... 8  RECLAMATION: ......................................................................................................................................... 8  General ........................................................................................................................................................................ 8  APPENDIX A ............................................................................................................................................... 9  BEST MANAGEMENT PRACTICE (BMP) ............................................................................................ 9  CONSTRUCTION SPECIFICATIONS ..................................................................................................... 9  TEMPORARY GRAVEL CONSTRUCTION ENTRANCE/EXIT ............................................................... 10  LAND GRADING FOR MINIMIZING EROSION ........................................................................................... 12  MINIMIZE DISTURBANCE AND BUFFER STRIPS ................................................................................... 14  MULCHING .............................................................................................................................................................. 15  PERMANENT SEEDING...................................................................................................................................... 19  SURFACE ROUGHENING ................................................................................................................................... 21  TEMPORARY SEEDING ...................................................................................................................................... 26  TOPSOILING ........................................................................................................................................................... 28  ENERGY DISSIPATOR ......................................................................................................................................... 30  Oak Meadows Ranch – Filing 4 – Phase 2 Preliminary Construction Management Plan Oak Meadows Ranch – Filing 4 – Phase 3 – Preliminary Construction Management Plan Page 3 WATERBARS AND ROLLING DIPS ................................................................................................................ 32  TEMPORARY SEDIMENT BASIN .................................................................................................................... 34  SILT FENCE ............................................................................................................................................................. 37  STRAW BALE SEDIMENT BARRIERS (SEMI-PERVIOUS) .................................................................... 39  STRAW BALE DIKE ............................................................................................................................................. 41  COIR LOGS / STRAW ROLLS (WATTLES) .................................................................................................. 43  CHECK DAMS ......................................................................................................................................................... 45  EROSION CONTROL BLANKETS AND MATS ............................................................................................ 50  TEMPORARY DIVERSION DIKE ..................................................................................................................... 55  APPENDIX B ............................................................................................................................................ 57  CONSTRUCTION SPECIFICATIONS .................................................................................................. 57  SPECIAL CONDITIONS ......................................................................................................................... 61  1. GENERAL ....................................................................................................................................................... 61  2. SCOPE OF WORK ........................................................................................................................................ 61  3. SCHEDULE OF WORK ............................................................................................................................... 61  4. CONSTRUCTION DRAWINGS ................................................................................................................ 61  5. CONSTRUCTION ACCESS ........................................................................................................................ 61  6. DELIVERY OF CONSTRUCTION MATERIALS AND EQUIPMENT ............................................ 61  7. EMERGENCY VEHICLE ACCESS ............................................................................................................ 61  8. MATERIAL TESTING ................................................................................................................................. 61  9. CONSTRUCTION STAKING ..................................................................................................................... 62  10. MAINTENANCE OF UTILITIES .............................................................................................................. 62  11. EROSION CONTROL AND BEST MANAGEMENT PRACTICES .................................................. 62  12. CLEARING AND GRUBBING ................................................................................................................... 63  13. EARTHWORK EXCAVATION AND RECOMPACTION OF ONSITE MATERIAL .................... 63  14. POTABLE WATER MAINS ....................................................................................................................... 63  15. JOINT RESTRAINT ..................................................................................................................................... 64  16. FIRE HYDRANT ASSEMBLIES ............................................................................................................... 64  17. MAIN LINE ISOLATION VALVES AND BOXES. ............................................................................... 64  18. CONNECTION TO EXISTING WATER LINES ................................................................................... 65  19. WATER SERVICE LINES .......................................................................................................................... 65  20. SERVICE SADDLES, CORPORATION STOPS, CURB STOPS AND RISER BOXES ................. 65  21. SANITARY SEWER MAIN LINE CONSTRUCTION .......................................................................... 65  22. SANITARY SEWER MANHOLE CONSTRUCTION ........................................................................... 65  23. SANITARY SEWER SERVICE LINE CONSTRUCTION ................................................................... 66  24. EXCAVATE SHALLOW UTILITY TRENCHES FOR ELECTRIC, PHONE, CABLE T.V. AND GAS. .................................................................................................................................................................. 66  25. SUBGRADE PREPARATION .................................................................................................................... 66  26. AGGREGATE BASE COURSE PLACEMENT ....................................................................................... 66  27. PROOF ROLLING, STABILITY ................................................................................................................ 66  28. HOT BITUMINOUS PAVEMENT ............................................................................................................ 67  29. TRAFFIC SIGNS ........................................................................................................................................... 67  30. TRAFFIC CONTROL ................................................................................................................................... 67  31. REVEGETATION OF DISTURBED AREAS ......................................................................................... 67  TRAFFIC REGULATION ........................................................................................................................ 68  CLEARING AND GRUBBING ................................................................................................................ 69  EXCAVATION .......................................................................................................................................... 70  EARTH FILL ............................................................................................................................................. 73  ROAD AGGREGATE ............................................................................................................................... 77  HOT BITUMINOUS PAVEMENT ......................................................................................................... 79  Oak Meadows Ranch – Filing 4 – Phase 2 Preliminary Construction Management Plan Oak Meadows Ranch – Filing 4 – Phase 3 – Preliminary Construction Management Plan Page 4 PORTLAND CEMENT CONCRETE ..................................................................................................... 91  STORM DRAINAGE ................................................................................................................................ 96  DRAINAGE CULVERTS ....................................................................................................................... 103  SEWER PIPELINE CONSTRUCTION ............................................................................................... 106  SEWER TESTING BY AIR PRESSURE ............................................................................................. 113  VACUUM TESTING OF MANHOLES ................................................................................................ 116  WATER PIPELINE CONSTRUCTION ............................................................................................... 117  HYDROSTATIC TESTING OF WATER PIPELINES ...................................................................... 124  FLUSHING AND DISINFECTION OF WATER LINES ................................................................... 127  SERVICE CONNECTIONS, SERVICE LINES, METERS AND APPURTENANCES ................... 128  SHALLOW UTILITIES ......................................................................................................................... 131  PAVEMENT MARKING ....................................................................................................................... 134  SEEDING AND MULCHING ................................................................................................................ 136  RESTORATION OF GROUNDS .......................................................................................................... 142  TESTING AND INSPECTION .............................................................................................................. 143  RECORD DRAWINGS .......................................................................................................................... 145  AIR POLLUTION CONTROL .............................................................................................................. 146  APPENDIX B1 ....................................................................................................................................... 147  AWWA Standard for Disinfecting Water Mains ....................................................................... 147  APPENDIX B2 ....................................................................................................................................... 148  Geotechnical Report from HP Geotech ....................................................................................... 148  Oak Meadows Ranch – Filing 4 – Phase 2 Preliminary Construction Management Plan Oak Meadows Ranch – Filing 4 – Phase 3 – Preliminary Construction Management Plan Page 5 INTRODUCTION: Project Location: The project is located on a 44.66 acre parcel which is within the Four Mile corridor approximately 6.0 miles from the intersection of 27th Street and Highway 82 in Glenwood Springs. More specifically the property is located west of Oak Way North (Garfield County Road 168A) and north of Overland View Drive within the Oak Meadows Ranch PUD in unincorporated Garfield, Colorado. Project Description: The project is a residential development and the work generally consists of the construction of the primary road and utility infrastructure necessary to serve the future residential development, which includes the following: site preparation; sanitary sewer system; domestic water supply system; storm drainage system; road; and shallow utilities. Project Owner: Oak Meadows, Filing 4, Phase 3 LLC Gary Johnson, Manager 320 Big Pinion Drive Basalt, Colorado 81621 gary@gmjcon.com Phone: (970) 379-3632 Project Contractor: To Be Determined PROJECT IMPLEMENTATION: Estimated Dates of Construction: Start Construction: Spring/Summer, 2022 End Construction: Fall 2022 / Spring 2023 Hours of Construction: Construction hours shall be limited to 7 AM to 6 PM Monday through Saturday. No construction is permitted on Sundays, and federally designated holidays. Construction Phasing: Although this development is the final phase of a larger multi-phase project, this proposed development is a single phase project. Construction Plans: The preliminary construction plans for the civil infrastructure elements of this project are as follows: Oak Meadows Ranch PUD – Preliminary Plan, Filing No. 4, Phase 3 Dated: June 28, 2021 Prepared by: Gamba & Associates, Inc. Oak Meadows Ranch – Filing 4 – Phase 2 Preliminary Construction Management Plan Oak Meadows Ranch – Filing 4 – Phase 3 – Preliminary Construction Management Plan Page 6 Final Construction Plans will be prepared and provided at the time of the application for Final Plat approval with Garfield County. Construction Specifications: The construction specifications for the civil infrastructure elements of this project will be prepared and provided at the time of the application for Final Plat approval with Garfield County. Reclamation and revegetation specification are attached hereto under Appendix B. PROJECT MANAGEMENT: An EROSION CONTROL PLAN (ECP) is included in the construction plans and identifies the following: Areas of Disturbance Depicted on the Erosion Control Plan. Proposed BMPs (Best Management Practices) Depicted on the Erosion Control Plan. Construction Parking Depicted on the Erosion Control Plan. Material and Equipment Storage Depicted on the Erosion Control Plan. Construction Staging Depicted on the Erosion Control Plan. Emergency Vehicle Access: The project can be accessed via two separate points of ingress and egress which are depicted on the ECP. At least one point of access shall be maintained in an unobstructed condition at all times. TRAFFIC CONTROL Construction Access All construction traffic shall access the project from Four Mile Road via Oak Way North. Access directly to the site will be through either of the proposed connections of the development road (Silver King Loop) to existing roads (Oak Way North or Overland View Drive). Weight and Dimensions of Construction Vehicles All construction related vehicles accessing the site shall be limited to the maximum weight and dimensions of vehicles allowed on Four Mile Road in accordance with all applicable Garfield County standards and regulations. Oak Meadows Ranch – Filing 4 – Phase 2 Preliminary Construction Management Plan Oak Meadows Ranch – Filing 4 – Phase 3 – Preliminary Construction Management Plan Page 7 Delivery of Construction Equipment and Materials All construction deliveries shall be limited to the hours of construction without exception. SEDIMENT AND EROSION CONTROL Best Management Practices (BMPs) The location and type of BMPs for sediment and erosion control for the project are depicted on the Erosion Control Plan. Also, attached hereto as Appendix A are the BMP specifications. Fugitive Dust Control In addition to the BMPs identified on the CMP, the project will utilize the following fugitive dust control measures:  Vehicle speeds on site shall be limited to 15 MPH  Contractor shall comply with the AIR POLLUTION CONTROL Construction Specifications included in the project specifications. This work shall include the application of a dust palliative on earthwork areas and haul roads to prevent the generation of dust on the site or other work areas.  The contractor shall maintain appropriate street sweeping equipment on site which shall be used as necessary if mud, sediment or other debris has been tracked onto any adjacent public road. VEHCILE EMISSIONS General All vehicles and equipment used on site shall be properly maintained such that the engines will function within the manufacturer’s standards or parameters, and shall comply with all applicable emissions standards. NOISE SUPPRESSION General The noise limit for all construction activities is 80 decibels as measured at the property line of the project. Construction equipment shall be adequately muffled and maintained to minimize project noise. The installation of plywood and matting around the project site is the minimum technique to suppress noise, particularly when jack hammering of concrete occurs. Any activity that generates noise in excess of 80 decibels will require a noise suppression plan and shall be restricted to operating between the hours of 9AM and 5PM Monday through Friday. Oak Meadows Ranch – Filing 4 – Phase 2 Preliminary Construction Management Plan Oak Meadows Ranch – Filing 4 – Phase 3 – Preliminary Construction Management Plan Page 8 Noise Controls The following noise controls shall be employed during construction:  Pile Driver – Enclosure and Muffler  Stone Saw Cutting - Noise Control Pad with Water  Handheld Impact Drills - Reduction Of Reflected Sound  Circular Saw Blades - 15° Tooth Angle, New Tooth Configuration, Slotted Saw Blades, Viscoelastic Damping  Pneumatic Tools - Muffler  Pavement Breaker / Rock Drill - Muffler and Enclosure of Cylinder Case and Front Head.  Portable Air Compressor - Muffler And Enclosure  Vibratory Roller - Flexible Mounting For Pump Compartment  Joint Cutter - Anti-Vibration Mounting Fixtures RECLAMATION: General All disturbed areas within the Oak Meadows Ranch – Filing 4 – Phase 3 project shall be reclaimed at a minimum in accordance with the Erosion Control Plan, the Construction Specifications REVEGETATION OF DISTURBED AREAS, and the BMP specifications included in Appendix A of this report. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 9 APPENDIX A BEST MANAGEMENT PRACTICE (BMP) CONSTRUCTION SPECIFICATIONS Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 10 TEMPORARY GRAVEL CONSTRUCTION ENTRANCE/EXIT Construction Specifications:  The aggregate size for construction of the pad shall be 2-3 inch (51-76 mm) stone. Place the gravel to the specific grade and dimensions shown on the plans, and smooth it.  The thickness of the pad shall not be less than 6 inches (0.2 m). Use geotextile fabrics, if necessary, to improve stability of the foundation in locations subject to seepage or high water table.  The width of the pad shall not be less than the full width of all points of ingress or egress and in any case shall not be less than 12 feet (3.6 m) wide.  The length of the pad shall be as required, but not less than 50 feet (15.2 m).  Locate construction entrances and exits to limit sediment leaving the site and to provide for maximum utility by all construction vehicles. Avoid entrances which have steep grades and entrances at curves in public roads.  The entrance shall be maintained in a condition that will prevent tracking or flowing of sediment onto public rights-of-way. This may require periodic top dressing with additional stone as conditions demand, and repair and/or maintenance of any measures used to trap sediment.  All sediment spilled, dropped, washed or tracked onto public rights-of-way shall be removed immediately.  Provide drainage to carry water to a sediment trap or other suitable outlet.  When necessary, wheels shall be cleaned to remove sediment prior to entrance onto public rights-of-way. When washing is required, it shall be done on an area stabilized with crushed stone that drains into an approved sediment trap or sediment basin.  All sediment shall be prevented from entering any storm drain, ditch or watercourse through use of sand bags, gravel, straw bales, or other approved methods. Inspection and Maintenance:  Maintain the gravel pad in a condition to prevent mud or sediment from leaving the construction site.  Replace gravel material when surface voids are visible.  After each rainfall, inspect any structure used to trap sediment and clean it out as necessary.  Immediately remove all objectionable materials spilled, washed, or tracked onto public roadways. Remove all sediment deposited on paved roadways within 24 hours. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 11 Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 12 LAND GRADING FOR MINIMIZING EROSION Construction Specifications:  Only disturb, clear, or grade areas necessary for construction. Flag or otherwise delineate areas not to be disturbed. Exclude vehicles and construction equipment from these areas to preserve natural vegetation.  All graded or disturbed areas including slopes shall be protected during clearing and construction in accordance with the approved erosion and sediment control plan until they are permanently stabilized.  All sediment control measures shall be constructed and maintained in accordance with the approved erosion and sediment control plan and according to the standards and specifications for the appropriate erosion control practices.  If topsoil is required for the establishment of vegetation, it shall be stockpiled in the amount necessary to complete finished grading and protected from erosion during the interim.  Areas to be filled shall be cleared, grubbed to remove trees, vegetation, roots and other objectionable material, and stripped of topsoil.  Areas to receive topsoil shall be scarified to a minimum depth of 3 inches (76 mm) prior to placement of topsoil.  All fills shall be compacted as required by building standards to reduce erosion, slippage, settlement, subsidence and other related problems. Fill intended to support buildings, structures, conduits, etc., shall be compacted in accordance with local requirements or codes.  The outer face of the fill slope should be allowed to stay loose, not rolled, compacted, or bladed smooth. A bulldozer may run up and down the fill slope so the dozer treads (cleat tracks) create grooves perpendicular to the slope. If the soil is not too moist, excessive compaction will not occur.  All fill shall be placed and compacted in layers not to exceed 8 inches (0.2 m) per lift.  Use slope breaks, such as diversions, benches, or contour furrows as appropriate, to reduce the length of cut-and-fill slopes to limit sheet and rill erosion and prevent gully erosion.  The finished cut-and-fill slopes, which are to be vegetated with grass and legumes, should not be steeper than 2:1.  Slopes to be maintained by tractor or other equipment should not be steeper than 3:1.  Slopes in excess of 2:1 may require hydroseeding, hydromulching, tactifying, and/or "punching-in" straw, bioengineering techniques, or retaining walls.  Roughen the surface of all slopes during the construction operation to retain water, increase infiltration, and facilitate vegetation establishment.  Seeps or springs encountered during construction shall be handled in accordance with approved methods. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 13  Stabilize all graded areas with vegetation, crushed stone, riprap, or other ground cover as soon as grading is completed or if work is interrupted for 21 working days or more.  Use mulch to stabilize areas temporarily where final grading must be delayed.  Stockpiles, borrow areas and spoil areas shall be shown on the plans and shall be stabilized to prevent erosion and sedimentation. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 14 MINIMIZE DISTURBANCE AND BUFFER STRIPS Construction Specifications:  Designate areas of no disturbance. Clearly show on the plans, and flag in the field areas of no disturbance and construction vehicle exclusion.  Designate trees and shrubs that are to be preserved.  Designate watercourse buffer-filter strips on the site design plan.  Maintain and preserve riparian and naturally vegetated buffer strips along watercourses.  The width of a buffer strip between a road and the stream is recommended to be 50 feet plus four times the slope of the land in percent, measured between the road and the top of stream bank. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 15 MULCHING Construction Specifications: Erosion Control Blankets Erosion control blankets are typically made from straw, coconut fiber, excelsior or synthetic material that is enveloped in plastic or biodegradable netting. Erosion control blankets are suited for post-construction site stabilization, but may be used for temporary stabilization of highly erosive soils. Erosion control blankets are suitable for steep slopes, stream banks and where vegetation will be slow to establish. Blankets and mats may be used in channels where water velocities 3 ft./sec. (3 km/hr.) and 6 ft./sec. (7 km/hr.) is likely to wash out new vegetation. Erosion control blankets made of excelsior, coconut, or straw must be stapled to the surface especially in waterways and on steep slopes. See Erosion Control Blankets and Mats BMP. Straw Straw is an excellent mulch material. Because of its length and bulk, it is highly effective in reducing the impact of raindrops and in moderating the microclimate of the soil surface. Straw mulch can be applied by hand on small sites and blown on by machine on large sites. Straw blowers have a range of about 50 feet (15 m). Some commercial models advertise a range up to 85 feet (25.9 m) and a capacity of 15 tons/hr (14,000 kg/hr). Mulch should not be applied more than 2 inches (5 cm) deep on seeded sites, unless it is incorporated into the soil by tracking, disking, or other ‘punching in’ techniques. If the straw is applied at rates higher than 3 tons/acre (7 tons/ha), the mulch may be too dense for the sunlight and seedlings to penetrate. Prior to mulching, install any needed erosion and sediment control practices such as diversions, grade stabilization structures, berms, dikes, grass-lined channels and sediment basins. See Temporary Diversion Dike, Grass-Lined Channels, Continuous Berm, and Sediment Basin BMPs.  Obtain clean wheat, barley, oat, or rice straw in order to prevent the spread of noxious weeds. Avoid moldy, compacted straw because it tends to clump and is not distributed evenly.  The straw shall be evenly distributed by hand or machine to the desired depth of 2-4 inches (50-100 mm) and should cover the exposed area to a uniform depth.  Approximately one bale (approximately 80 lbs. (35 kg)) of straw covers 1000 ft2 (93 m2) adequately. The soil surface should be barely visible through the straw mulch. On steep or high wind sites, straw must be anchored to keep it from blowing away.  For seeded sites apply: 1.5-2 tons/acre (3300-4500 kg/ha), 1-2 inches (25-50 mm) deep, covering 80% of the soil surface.  For unseeded sites: 2-3 tons/acre(4500-6700 kg/ha), 2-4 inches (50-100 mm) deep, covering 90% of the soil surface. Anchoring Mulch must be anchored immediately to minimize loss by wind or water. Straw mulch is commonly anchored by: Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 16  crimping, tracking, disking, or punching into the soil; or  covering with a netting; or  spraying with asphaltic or organic tackifier; or  tacking with cellulose fiber mulch at a rate of 750 lbs/ac (840 kg/ha). Crimping:  On small sites, where straw has been distributed by hand, it can be anchored by hand punching it into the soil every 1-2 feet (0.3-0.6 m) with a dull, round-nosed shovel. A sharp shovel will merely cut the straw and not anchor it.  A mulch anchoring tool is a tractor drawn implement designed to punch and anchor mulch into the top 2-8 inches (50-200 mm) of soil. This practice affords maximum erosion control but is limited to flatter slopes where equipment can operate safely.  Tracking is the process of cutting straw into the soil using a bulldozer or other equipment that runs on cleated tracks. Tracking is used primarily on slopes 3:1 or shallower; where this type of equipment can safely operate. This is an effective way to crimp straw on fill slopes. Tracking equipment must operate up and down the slope so the cleat tracks are perpendicular to flow. Nettings:  Nettings of biodegradable paper, plastic or cotton netting can be used to cover straw mulch. Netting should be specified judiciously since birds, snakes and other wildlife can get trapped in the nettings. Tacifiers:  Polymer tackifiers are generally applied at rates of 40-60 lbs/ac (44-67 kg/ha), however manufacturers recommendations may vary.  Organic tackifiers are generally applied at rates of 80-120 lbs/acre (89.7-134.5 kg/ha), however manufacturer’s recommendations vary.  Applications of liquid mulch binders shall be heavier at edges, in valleys, and at crests of banks and other areas where the mulch may be moved by wind or water. All other areas shall have a uniform application of the tackifier. Wood chips or Bark  Apply at a rate of approximately 6 tons/acre (1300 kg/ha) or 275 lbs/1,000 ft.2 (125 kg/93 m2).  The mulch should be evenly distributed across the soil surface to a depth of 2-3 inches (50-75 mm).  If decomposition, soil building and re-vegetation is desirable, increase the application rate of nitrogen fertilizer by 20 lbs. of N/acre (22 kg/ha), to compensate for the temporary diversion (loss) of available N to the soil microbes Hydraulic Mulches from Recycled Paper This mulch is made from recycled newsprint, magazine, or other waste paper sources. This type of mulch is to be mixed in a hydraulic application machine (hydroseeder) and applied as a liquid slurry which contains the recommended rates of seed and fertilizer for the site. It can be specified with or without a tackifier. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 17  Apply at rate of 1500-2000 lbs/ac (1700-2200 kg/ha), mixed with seed and fertilizer, at recommended rates, in order to achieve uniform, effective coverage.  Paper mulch used to tack and bind straw mulch can be specified at a lower rate, 750 lbs/ac (850 kg/ha). Hydraulic Mulches from Wood Fiber This type of mulch is manufactured from wood waste. This type of mulch is also to be mixed in a hydraulic application machine (hydroseeder) and applied as a liquid slurry which contains the recommended rates of seed and fertilizer for the site. A wood fiber mulch can be manufactured containing a tackifier in each bag or specified without a tackifier. Hydraulic Mulches from Wood and Paper Fiber These combination mulches are generally comprised of 70% wood fiber and 30% paper fiber, manufactured from lumber mill waste, virgin wood chips, recycled newsprint, office paper and other waste paper. The mulch is mixed in a hydraulic applicating machine (hydroseeder) and applied as a slurry in combination with the recommended seed and fertilizer. The mulch can be specified with or without a tackifier. Recommendations: Wood, paper or combination fiber mulches are typically applied with a hydraulic applicator (hydroseeder) at a minimum rate of 1500 lbs/ac (1681 kg/ha). A typical construction specification and application for mulch is as follows:  Moisture content (total weight basis) not to exceed 12% +/- 3%.  Organic matter content (oven dry weight basis) is 98% minimum.  Inorganic matter (ash) content (oven dried basis) 2% maximum.  pH at 3% consistently in water should be 4.9.  Fiber shall be dyed to aid visual metering during application. The dye shall be biodegradable and shall not inhibit plant growth.  Water holding capacity (oven dried basis) minimum 1.0 gal/lb of fiber (850g H20/100g fiber).  The mulch shall be mixed with seed and fertilizer as specified and applied at a rate recommended by the manufacturer in order to achieve uniform, effective coverage and provide adequate distribution of seed. For enhanced performance, apply seed and mulch in a two or three-stage process. Two Step Method: 1. Apply seed, at recommended rate, and half the recommended mulch, 750 lbs/ac (840 kg/ha), as a slurry. This first step assures maximum seed to soil contact. 2. Apply the remaining recommended mulch 750 lbs/ac (840 kg/ha), with recommended tackifier and fertilizer. Polymer tackifiers are applied at rates of 40-60 lbs/ac (44-67 kg/ha) and organic tackifiers at a rate of 80-120 lbs/ac (89-135 kg/ha). See Hydraulic Planting BMP. Three-Step Straw Mulch Method, for steep and critical erosion sites: 1. Apply seed hydraulically in a slurry with 500 lbs/ac (600 kg/ha) hydraulic mulch. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 18 2. Followed by the application of straw mulch at a rate of 1 T/ac (2250 kg/ha). 3. Fertilizer, tackifier and the remaining hydraulic mulch, 500-750 lbs/ac (600-850 kg/ha) minimum, is then applied. Inspection and Maintenance: If properly applied and anchored, little additional maintenance is required during the first few months. After high winds, or significant rainstorms, mulched areas should be checked for adequate cover and re-mulched if necessary. Mulch needs to last until vegetation develops to provide permanent erosion resistant cover. Straw mulch can last from 6 months to 3 years. Erosion control blankets are effective for up to two years. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 19 PERMANENT SEEDING Construction Specifications: Timing:  Apply permanent seeding on areas left dormant for 1 year or more.  Apply permanent seeding when no further disturbances are planned.  To determine optimum seeding schedule, consult a local agronomist or erosion control specialist.  Apply permanent seeding before seasonal rains or freezing weather is anticipated.  Use dormant seeding for late fall or winter seeding schedules. Seed Mixes:  Use seeds appropriate to the season and site conditions.  Consult local agronomist or erosion control specialists for seed mix.  Use a seed blend to include annuals, perennials and legumes.  Use seed rates based on pure live seed (PLS) of 80%. When PLS is below 80% adjust rates accordingly. Site Preparation:  Bring the planting area to final grade and install the necessary erosion control practices.  Divert concentrated flows away from the seeded area.  Conduct soil test to determine pH and nutrient content. Roughen the soil by harrowing, tracking, grooving or furrowing.  Apply amendments as needed to adjust pH to 6.0-7.5. Incorporate these amendments into the soil.  Prepare a 3-5 inch (76-127 mm) deep seedbed, with the top 3-4 inches (76-102 mm) consisting of topsoil.  The seedbed should be firm but not compact. The top three inches of soil should be loose, moist and free of large clods and stones.  The topsoil surface should be in reasonably close conformity to the lines, grades and cross sections shown on the grading plans. Planting:  Seed to soil contact is the key to good germination.  Seed should be applied immediately after seedbed preparation while the soil is loose and moist. If the seedbed has been idle long enough for the soil to become compact, the topsoil should be harrowed with a disk, spring tooth drag, spike tooth drag, or other equipment designed to conditions the soil for seeding.  Harrowing, tracking or furrowing should be done horizontally across the face of the slope. Seed to soil contact is the key to good germination. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 20  Always apply seed before applying mulch.  Apply seed at the rates specified using calibrated seed spreaders, cyclone seeders, mechanical drills, or hydroseeder so the seed is applied uniformly on the site  Broadcast seed should be incorporated into the soil by raking or chain dragging, and then lightly compacted to provide good seed-soil contact.  Apply fertilizer as specified.  Apply mulch or erosion control blanket, as specified, over the seeded areas. Inspection and Maintenance:  Newly seeded areas need to be inspected frequently to ensure the grass is growing.  If the seeded area is damaged due to runoff, additional stormwater measures may be needed.  Spot seeding can be done on small areas to fill in bare spots where grass did not grow properly. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 21 SURFACE ROUGHENING Construction Specifications: Cut Slope Roughening:  Stair-step grade or groove the cut slopes that are steeper than 3:1.  Use stair-step grading on any erodible material soft enough to be ripped with a bulldozer. Slopes consisting of soft rock with some subsoil are particularly suited to stair- step grading.  Make the vertical cut distance less than the horizontal distance, and slightly slope the horizontal position of the "step" in toward the vertical wall.  Do not make individual vertical cuts more than 2 feet (0.6 m) high in soft materials or more than 3 feet (0.9 m) high in rocky materials.  Groove the slope using machinery to create a series of ridges and depressions that run across the slope, on the contour. Fill Slope Roughening:  Place fill slopes with a gradient steeper than 3:1 in lifts not to exceed 8 inches (0.2 m), and make sure each lift is properly compacted.  Ensure that the face of the slope consists of loose, uncompacted fill 4-6 inches (0.1-0.2 m) deep.  Use grooving or tracking to roughen the face of the slopes, if necessary.  Apply seed, fertilizer and straw mulch then track or punch in the mulch with the bulldozer.  Do not blade or scrape the final slope face. Cuts, Fills, and Graded Areas:  Make mowed slopes no steeper than 3:1.  Roughen these areas to shallow grooves by normal tilling, disking, harrowing, or use a cultipacker-seeder. Make the final pass of any such tillage on the contour.  Make grooves formed by such implements close together (less than 10 inches (0.3 m)), and not less than 1 inch (25.4 mm) deep.  Excessive roughness is undesirable where mowing is planned. Roughening With Tracked Machinery:  Limit roughening with tracked machinery to soils with a sandy textural component to avoid undue compaction of the soil surface.  Operate tracked machinery up and down the slope to leave horizontal depressions in the soil. Do not back-blade during the final grading operation.  Immediately seed and mulch roughened areas to obtain optimum seed germination and growth. Inspection and Maintenance: Periodically check the seeded slopes for rills and washes. Fill these areas slightly above the original grade, then reseed and mulch as soon as possible. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 22 Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 23 Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 24 Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 25 Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 26 TEMPORARY SEEDING Construction Specifications: Timing: The proper time to seed is dependent upon the climate of the area. Seed Mixes: Select plants appropriate to the season and site conditions.  Legumes should be inoculated with the proper rhizobium bacteria before planting. Pellet inoculated seed can be purchased or inoculation can be done in the field. Use only fresh, age dated inoculate specifically labeled for use with the legume you are using. Site Preparation:  Grade as needed and feasible to permit the use of equipment for seedbed preparation.  Install needed erosion control practices, such as sediment basins, diversion dikes and channels, prior to seeding. Divert concentrated flows away from seeded areas.  Soil tests should be done to determine the nutrient and pH content of soil. Depending on the results of soil tests, soil management may be necessary to adjust the pH to between 6.5 and 7.0 (for most conditions). All lime, fertilizer and other soil amendments should be addressed following sound soil management practices.  Surface roughening: If the area has been recently loosened or disturbed, no further roughening is required. When the area is compacted, crusted or hardened the soil shall be loosened with discing, raking or harrowing. Tracking with bulldozer cleats is very effective on sandy soils.  Hydroseeding and hydraulic planting generally require less seedbed prep.  Generally, slopes steeper than 2:1 that cannot have good seedbed preparations with equipment, and will sometimes require hydraulic planting techniques.  Seed to soil contact is the key to good germination. Prepare a 3-5 inch (76-127 mm) deep seedbed, with the top 3-4 inches (76-102 mm) consisting of topsoil. Note that the earth bed upon which the topsoil is to be placed should be at the required grade.  The seedbed should be firm but not compact. The top 3 inches (76 mm) of soil should be loose , moist and free of large clods and stones. For most applications, all stones larger than 2 inches (51 mm) in diameter, roots, litter and any foreign matter should be raked and removed.  The topsoil surface should be in reasonably close conformity to the lines, grades and cross sections shown on the grading plans. Planting:  Seed should be applied as soon after seedbed preparation as possible, when the soil is loose and moist.  Always apply seed before mulch.  Apply seed using calibrated spreaders, cyclone seeders, mechanical drills, or hydroseeders so the seed is applied uniformly on the site. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 27  Apply fertilizer if required. Seed and fertilizer should be incorporated into the soil by raking or chain dragging, or otherwise floated, then lightly compacted to provide good seed- soil contact.  Straw mulch, erosion control blankets or mulch and tackifiers/soil binders should be applied over the seeded areas. Inspection and Maintenance:  Newly seeded areas need to be inspected frequently to ensure the grass is growing. Areas which fail to establish cover adequate to prevent sheet and rill erosion will be reseeded as soon as such areas are identified. Spot seeding can be done on small areas to fill in bare spots where grass did not grow properly.  If the seeded area is damaged due to concentrated runoff, additional practices may be needed.  Temporary vegetated areas will be maintained until permanent vegetation or other erosion control practices can be established Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 28 TOPSOILING Construction Specifications:  Determine whether the quality and quantity of available topsoil justifies selective handling.  Soils of the textural class of loam, sandy loam, and silt loam are best; sandy clay loam, silty clay loam, clay loam, and loamy sand are fair. Do not use heavy clay and organic soils such as peat or muck as topsoil.  Strip topsoil only from those areas that will be disturbed by excavation, filling, road building, or compacting by equipment. A 4-6 inch (0.1-0.2 m) stripping depth is common, but depth varies depending on the site.  Determine depth of stripping by taking soil cores at several locations within each area to be stripped. Topsoil depth generally varies along a gradient from hilltop to toe of the slope.  Put sediment basins, diversions, and other controls into place before stripping.  Select stockpile location to avoid slopes, natural drainage ways, and traffic routes. On large sites, re-spreading is easier and more economical when topsoil is stockpiled in small piles located near areas where they will be used.  Use silt fences or other barriers where necessary to retain sediment.  Protect topsoil stockpiles by temporarily seeding and/or mulching as soon as possible to assure the stored material is not exposed and allowed to erode.  If stockpiles will not be used within 12 months they must be stabilized with permanent vegetation to control erosion and weed growth.  Before spreading topsoil, establish erosion and sedimentation control practices such as diversions, berms, dikes, waterways, and sediment basins.  Where the pH of the existing subsoil is 6.0 or less, or the soil is composed of heavy clays, incorporate agricultural limestone in amounts recommended by soil tests or specified for the seeding mixture to be used. Incorporate lime to a depth of at least 2 inches (51 mm) by disking.  Immediately prior to spreading the topsoil, loosen the subgrade by disking or scarifying to a depth of at least 3 inches (76 mm), to ensure bonding of the topsoil and subsoil. If no amendments have been incorporated, loosen the soil to a depth of at least 6 inches (0.15 m) before spreading topsoil.  Uniformly distribute topsoil to a minimum compacted depth of 2 inches (51 mm) on 3:1 slopes and 4 inches (0.1 m) on flatter slopes.  Do not spread topsoil while it is frozen or muddy or when the subgrade is wet or frozen.  Correct any irregularities in the surface that result from topsoiling or other operations to prevent the formation of depressions or water pockets.  Compact the topsoil enough to ensure good contact with the underlying soil, but avoid excessive compacting, as it increases runoff and inhibits seed germination. Light packing with a roller is recommended where high maintenance turf is to be established. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 29  On slopes and areas that will not be mowed, the surface may be left rough after spreading topsoil. A disk may be used to promote bonding at the interface between the topsoil and subsoil. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 30 ENERGY DISSIPATOR Construction Specifications:  Ensure that the subgrade for the filter and riprap follows the required lines and grades shown in the plan. Compact any fill required in the subgrade to the density of the surrounding undisturbed material. Low areas in the subgrade on undisturbed soil may also be filled by increasing the riprap thickness.  The riprap and gravel filter must conform to the specified grading limits shown on the plans.  Filter cloth, when used, must meet design requirements and be properly protected from punching or tearing during installation. Repair any damaged fabric by removing the riprap and placing another piece of filter cloth over the damaged area. All connecting joints should overlap a minimum of 1 foot (0.3 m). If the damage is extensive, replace the entire filter cloth.  Riprap may be placed by equipment, but take care to avoid damaging the filter.  The minimum thickness of the riprap should be 1.5 times the maximum stone diameter.  Riprap may be field stone or rough quarry stone. It should be hard, angular, highly weather-resistant and well graded.  Construct the apron on zero grade with no overfall at the end. Make the top of the riprap at the downstream end level with the receiving area or slightly below it.  Ensure that the apron is properly aligned with the receiving stream and preferably straight throughout its length. If a curve is needed to fit site conditions, place it in the upper section of the apron.  Immediately after construction, stabilize all disturbed areas with vegetation. Inspection and Maintenance: Inspect riprap outlet structures after heavy rains to see if any erosion around or below the riprap has taken place or if stones have been dislodged. Immediately make all needed repairs to prevent further damage. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 31 Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 32 WATERBARS AND ROLLING DIPS Construction Specifications:  Install the diversion as soon as the right-of-way has been cleared and graded.  Construct a rolling dip if the road is intended for winter use and use by vehicles with low clearance.  The waterbars and rolling dips should be built at an angle of 45 to 60 degrees from the centerline.  The diversion should have a positive grade of 2% minimum.  For rolling dips the height from channel bottom to the top of the settled ridge shall be 18 inches (0.5 m) and the side slopes of the ridge shall be 2:1 or flatter.  The distance it takes for unrocked, unprotected running surface of a nearby road to develop a 1 inch (25.4 mm) rill is a rough measure of the appropriate spacing distance. Inspection and Maintenance:  Periodically inspect waterbars and rolling dips. Inspect after every heavy rainfall for erosion damage. Immediately remove sediment from the flow area.  Check outlet areas and make timely repairs as needed. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 33 Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 34 TEMPORARY SEDIMENT BASIN Construction Specifications:  Construct the basin by excavating or building an embankment before any clearing or grading work begins.  Areas under the embankment and any structural works shall be cleared, grubbed and stripped of any vegetation and rootmat as shown on the erosion and sediment control plan.  In order to facilitate cleanout and restoration, the basin area shall be cleared, grubbed and stripped of any vegetation.  A cut-off trench shall be excavated along the centerline of the earth fill embankments. The minimum depth shall be 2 feet (0.6 m) The cut-off trench shall extend up both abutments to the riser crest elevation.  Fill material for the embankment should be clean mineral soil free of roots, woody vegetation, oversized stones, rocks or other objectionable material.  The fill material shall contain sufficient moisture so that it can be formed by hand into a ball without crumbling.  Fill material shall be placed in 6 inch (0.2 m) lifts, continuous layers over the entire length of the fill. Compacting shall be obtained by routing the hauling equipment over the fill so that the entire surface of each layer of the fill is traversed by at least one wheel or tread track of the equipment, or by the use of a compactor.  The embankment should be constructed to an elevation of 10 percent higher than the design height to allow for settlement if compacting is achieved with hauling equipment. If compactors are used for compacting, the overbuild may be reduced to not less than 5 percent.  The principle spillway riser shall be securely attached to the discharge pipe by welding all around. All connections shall be watertight.  The pipe and riser shall be placed on a firm, smooth soil foundation. The connection between the riser and the riser base shall be watertight. Pervious materials such as sand, gravel or crushed stone shall not be used as backfill around the pipe or anti-seep collars.  The fill material around the pipe spillway shall be placed in 4-inch (101 mm) layers and compacted under the shoulders and around the pipe to at least the same density as the adjacent embankment. A minimum of 2 feet (0.6 m) of compacted backfill shall be placed over the pipe spillway before crossing it with construction equipment.  Steel base plates shall have at least 2 1/2 feet (0.8 m) of compacted earth, stone or gravel over them to prevent flotation.  The emergency spillway shall not be installed in fill. Elevations, design width, and entrance and exit channel slopes are critical to the successful operation of the emergency spillway.  Baffles shall be constructed of 4 inch (101 mm) by 4 inch (101 mm) posts and of 4 foot (1.2 m) by 8 foot (2.4 m) - 1/2inch (12.7 mm) exterior plywood. The posts shall be set at least 3 feet (0.9 m) into the ground, no further apart than 8 feet (2.4 m) center to center, and shall reach a height 6 inches (.2 m) below the riser crest elevation.  The embankment and emergency spillway shall be stabilized with vegetation immediately following construction. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 35  Construction operations shall be carried out in such a manner that erosion and water pollution will be minimized.  Local and state requirements shall be met concerning fencing and signs warning the public of hazards of soft sediment and floodwater. Inspection and Maintenance:  Inspect weekly and after each rain.  All damages caused by soil erosion or construction equipment shall be repaired before the end of each working day.  Remove sediment when the sediment strorage zone is half full. This sediment shall be placed in such a manner that it will not erode from the site. The sediment shall not be deposited downstream from the embankment or in or adjacent to a stream or floodplain.  When temporary structures have served their intended purpose and the contributing drainage area has been properly stabilized, the embankment and resulting sediment deposit shall be leveled or otherwise disposed of in accordance with the approved erosion and sediment control plan. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 36 Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 37 SILT FENCE Construction Specifications:  The height of a silt fence shall not exceed 36 inches (0.9 m). Storage height and ponding height shall never exceed 18 inches (0.5 m).  The fence line shall follow the contour as closely as possible.  If possible, the filter fabric shall be cut from a continuous roll to avoid the use of joints. When joints are necessary, filter cloth shall be spliced only at a support post, with a minimum 6 inch (0.2 m) overlap and both ends securely fastened to the post.  Posts shall be spaced a maximum of 10 feet (3.1 m) apart and driven securely into the ground (minimum of 12 inches (0.3 m)). When extra-strength fabric is used without the wire support fence, post spacing shall not exceed 6 feet (1.8 m).  Turn the ends of the fence uphill.  A trench shall be excavated approximately 4 inches (101 mm) wide and 6 inches (0.2 m) deep along the line of posts and upslope from the barrier.  When standard-strength filter fabric is used, a wire mesh support fence shall be fastened securely to the upslope side of the posts using heavy duty wire staples at least 1inch (25.4 mm) long, tie wires or hog rings. The wire shall extend into the trench a minimum of 2 inches (51 mm) and shall not extend more than 36 inches (0.9 m) above the original ground surface.  The standard-strength filter fabric shall be stapled or wired to the fence, and 6 inches (0.2 m) of the fabric shall extend into the trench. The fabric shall not extend more than 36 inches (0.9 m) above the original ground surface. Filter fabric shall not be stapled to existing trees.  When extra-strength filter fabric and closer post spacing are used, the wire mesh support fence may be eliminated. In such a case, the filter fabric is stapled or wired directly to the posts.  The trench shall be backfilled and the soil compacted over the toe of the filter fabric.  Silt fences placed at the toe of a slope shall be set at least 6 feet (1.8 m) from the toe in order to increase ponding volume.  Silt fences shall be removed when they have served their useful purpose, but not before the upslope area has been permanently stabilized and any sediment stored behind the silt fence has been removed. Inspection and Maintenance:  Silt fences and filter barriers shall be inspected weekly after each significant storm (1 inch (25.4 mm) in 24 hour). Any required repairs shall be made immediately.  Sediment should be removed when it reaches 1/3 height of the fence or 9 inches (0.3 m) maximum.  The removed sediment shall conform with the existing grade and be vegetated or otherwise stabilized. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 38 Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 39 STRAW BALE SEDIMENT BARRIERS (SEMI‐PERVIOUS) Construction Specifications:  The rock spillway shall be constructed of graded drain rock, 1 1/2 inch (38 mm) minimum, that is sized according to expected flows. Filter fabric may be used to cover the bales and be enveloped in the rock spillway. Filter fabric will increase the useful life of the barrier beyond one year.  The rock spillway shall be constructed to a height of 2/3 that of the straw bales.  The maximum height of the spillway shall be 2 feet (0.6 m).  Place bales in a single row, lengthwise, oriented perpendicular to the flow, and with ends of adjacent bales tightly abutting one another.  Each bale shall be embedded in the soil a minimum of 4 inches (101 mm). Use straw, rocks, or filter fabric to fill any gaps between the bales and tamp the backfill material to prevent erosion under or around the bales.  If the bales are wire bound, they should be oriented so the bindings are around the sides rather than along the top and bottom. Wire bindings that are placed in contact with the soil soon disintegrate and may allow the bale to fall apart.  The bales shall be securely anchored in place by two wooden stakes or rebar driven through the bales. The first stake in each bale shall be driven toward the previously laid bale to force the bales tightly together. Drive the stakes at least 18 inches (0.5 m) into the ground. Proper staking is particularly important in channel flow applications.  Extend the barrier, across the swale, to such a length that the bottoms of the end bales are at a higher elevation than the top of the rock spillway to assure that sediment-laden runoff will flow either through or over the barrier but not around it.  Rock and/or filter fabric placed immediately downstream of the rock spillway will dissipate the energy of the falling water and reduce downstream erosion. Inspection and Maintenance:  The semi-pervious straw bale barriers shall be inspected periodically during the winter and after each significant storm (1 inch (25.4 mm) in 24 hr). Repairs and/or replacement shall be made promptly.  Sediment shall be removed when the barrier is 60 percent full. The removed sediment shall be deposited in an area that will not contribute sediment off-site and can be permanently stabilized.  Remove the straw bales and stakes, and remove or spread the rock in the channel bottom when the upslope areas have been permanently stabilized.  Properly dispose of all the bindings which have fallen from the straw bales. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 40 Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 41 STRAW BALE DIKE Construction Specifications:  The bales shall be placed on the slope contour at the toe of the slope or around the perimeter of the construction site. If the dike is constructed at the toe of a slope, place it 5-6 feet (1.5-1.8 m) away from the slope if possible.  Do not construct the dike more than one bale high.  Bales shall be placed in a row with the ends tightly abutting.  Each bale shall be embedded in the soil a minimum of 4 inches (101 mm). Use straw, rocks, or filter fabric to fill any gaps between the bales and tamp the backfill material to prevent erosion under or around the bales.  If the bales are wire bound, they should be oriented so the bindings are around the sides rather than along the top and bottom. Wire bindings that are placed in contact with the soil soon disintegrate and may allow the bale to fall apart.  The bales shall be securely anchored in place by two wooden stakes or rebar driven through the bales. The first stake in each bale shall be driven toward the previously laid bale to force the bales tightly together. Drive the stakes at least 18 inches (0.5 m) into the ground.  The straw bales do not need to be anchored if the bales are used on a relatively flat construction area and the straw bale dike is inspected regularly. The trapped sediment should be removed when required, and repairs made promptly. The bales also do not need to be anchored if they are to be removed and replaced daily to facilitate construction. Inspection and Maintenance:  The straw bale dikes shall be inspected weekly and after each significant storm (1 inch (25.4 mm) in 24 hr).  Repairs and/or replacement shall be made promptly.  Remove sediment behind the barrier when it reaches a depth of 6 inches (0.2 m).  Remove the straw bales when the upslope areas have been permanently stabilized. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 42 Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 43 COIR LOGS / STRAW ROLLS (WATTLES) Construction Specifications:  Prepare the slope before the wattling procedure is started.  Shallow gullies should be smoothed as work progresses.  Dig small trenches across the slope on contour, to place rolls in. The trench should be deep enough to accommodate half the thickness of the roll. When the soil is loose and uncompacted, the trench should be deep enough to bury the roll 2/3 of its thickness because the ground will settle.  It is critical that rolls are installed perpendicular to water movement, parallel to the slope contour.  Start building trenches and install rolls from the bottom of the slope and work up.  Construct trenches at contour intervals of 3-12 feet (0.9-3.7 m) apart depending on steepness of slope. The steeper the slope, the closer together the trenches.  Lay the roll along the trenches fitting it snugly against the soil. Make sure no gaps exist between the soil and the straw wattle.  Use a straight bar to drive holes through the wattle and into the soil for the willow or wooden stakes.  Drive the stake through prepared hole into soil. Leave only 1 or 2 inches (25 or 51 mm) of stake exposed above roll.  Install stakes at least every 4 feet (1.2 m) apart through the wattle. Additional stakes may be driven on the downslope side of the trenches on highly erosive or very steep slopes. Inspection and Maintenance:  Inspect the straw rolls and the slopes after significant storms. Make sure the rolls are in contact with the soil.  Repair any rills or gullys promptly.  Reseed or replant vegetation if necessary until the slope is stabilized. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 44 Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 45 CHECK DAMS Construction Specifications:  Obtain appropriate permits or approvals from local or state regulatory agencies.  The maximum spacing between the dams shall be such that the toe of the upstream dam is at the same elevation as the top of the downstream dam.  Rock dams shall be constructed of 2-15 inch (51-381 mm) rock.  Keep the center rock (spillway) section at least 6 inches (0.2 m) lower than the outer edges.  Extend the abutments 18 inches (0.5 m) into the channel bank.  Straw bales shall be placed in a single row, lengthwise, oriented perpendicular to the flow, with the ends of adjacent bales tightly abutting one another.  Straw bale dams shall be extended such that the bottoms of the end bales are higher in elevation than the top of the middle bale spillway to ensure that sediment-laden runoff will flow over the barrier, and not around it.  Each straw bale shall be embedded in the soil a minimum of 4 inches (101 mm). Use straw, rocks, or filter fabric to fill any gaps between the bales and tamp the backfill material to prevent erosion under or around the bales.  If the straw bales are wire bound, they should be oriented so the bindings are around the sides rather than along the top and bottom. Wire bindings that are placed in contact with the soil soon disintegrate and may allow the bale to fall apart.  The straw bales shall be securely anchored in place by two wooden stakes or rebar driven through the bales. The first stake in each bale shall be driven toward the previously laid bale to force the bales tightly together. Drive the stakes at least 18 inches (0.5 m) into the ground. Proper staking is particularly important in channel flow applications.  Construct an energy dissipator to reduce downstream erosion. Inspection and Maintenance:  The check dams shall be inspected for damage periodically during the winter and after each significant storm (1 inch (25 mm) in 24 hours) Prompt repairs shall be made to ensure that the dam is functioning properly. Any erosion caused by flows around the edges of the dam or under the structure shall be corrected immediately.  Remove sediment from behind the dams when they become 60 percent full, or as needed. The removed sediment shall be deposited in an area that will not contribute sediment off-site and can be permanently stabilized.  Remove checkdams and stakes when stabilization is complete. Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 46 Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 47 Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 48 Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 49 Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 50 EROSION CONTROL BLANKETS AND MATS Construction Specifications: Site Preparation:  Proper site preparation is essential to ensure complete contact of the protection matting with the soil.  Grade and shape area of installation.  Remove all rocks, clods, vegetative or other obstructions so that the installed blankets, or mats will have direct contact with the soil.  Prepare seedbed by loosening 2-3 inches (50.8-76.2 mm) of topsoil above final grade.  Incorporate amendments, such as lime and fertilizer, into soil according to soil test and the seeding plan. Seeding:  Seed area before blanket installation for erosion control and re-vegetation. Seeding after mat installation is often specified for turf reinforcement application. When seeding prior to blanket installation, all check slots and other areas disturbed during installation must be reseeded.  Where soil filling is specified, seed the matting and the entire disturbed area after installation and prior to filling the mat with soil. Anchoring: U-shaped wire staples, metal geotextile stake pins, or triangular wooden stakes can be used to anchor mats to the ground surface. Wire staples should be a minimum of 11 gauge. Metal stake pins should be 3/16 inch (4.8 mm) diameter steel with a 1 1/2 inch (38.1 mm) steel washer at the head of the pin. Wire staples and metal stakes should be driven flush to the soil surface. All anchors should be 6-8 inches (0.2-0.5 m) long and have sufficient ground penetration to resist pullout. Longer anchors may be required for loose soils. Installation on Slopes:  Begin at the top of the slope and anchor its blanket in a 6 inch (0.2 m) deep x 6 inch (0.2 m) wide trench. Backfill trench and tamp earth firmly.  Unroll blanket downslope in the direction of the water flow.  The edges of adjacent parallel rolls must be overlapped 2-3 inches (51-76 mm) and be stapled every 3 feet (0.9 m).  When blankets must be spliced, place blankets end over end (shingle style) with 6 inch (0.2 m) overlap. Staple through overlapped area, approximately 12 inches (0.3 m) apart.  Lay blankets loosely and maintain direct contact with the soil - do not stretch.  Blankets shall be stapled sufficiently to anchor blanket and maintain contact with the soil. Staples shall be placed down the center and staggered with the staples placed along the edges. Steep slopes, 1:1 to 2:1, require 2 staples per square yard. Moderate slopes, 2:1 to 3:1, require 1-2 staples per square yard (1 staple 3’ o.c.). Gentle slopes require 1 staple per square yard. Installation in channels: Oak Meadows Ranch – Filing 4 - Phase 3 – Best Management Practices Appendix A APPENDIX A Page 51  Dig initial anchor trench 12 inches (0.3 m) deep and 6 inches (0.2 m) wide across the channel at the lower end of the project area.  Excavate intermittent check slots, 6 inches (0.2 m) deep and 6 inches (0.2 m) wide across the channel at 25-30 foot (7.6-9.1 m) intervals along the channel.  Cut longitudinal channel anchor slots 4 inches (101 mm) deep and 4 inches (101 mm) wide along each side of the installation to bury edges of matting. Whenever possible extend matting 2-3 inches (51-76 mm) above the crest of channel side slopes.  Beginning at the downstream end and in the center of the channel, place the initial end of the first roll in the anchor trench and secure with fastening devices at 1 foot (.3 m) intervals. Note: matting will initially be upside down in anchor trench.  In the same manner, position adjacent rolls in anchor trench, overlapping the preceding roll a minimum of 3 inches (7.6 cm).  Secure these initial ends of mats with anchors at 1 foot (0.3 m) intervals, backfill and compact soil.  Unroll center strip of matting upstream. Stop at next check slot or terminal anchor trench.  Unroll adjacent mats upstream in similar fashion, maintaining a 3 inch (76 mm) overlap.  Fold and secure all rolls of matting snugly into all transverse check slots. Lay mat in the bottom of the slot then fold back against itself. Anchor through both layers of mat at 1 inch (25.4 mm) intervals, then backfill and compact soil. Continue rolling all mat widths upstream to the next check slot or terminal anchor trench.  Alternate method for noncritical installations: place two rows of anchors on 6 inch (0.2 m) centers at 25-30 feet (7.6-9.1 m) intervals in lieu of excavated check slots.  Shingle-lap spliced ends by a minimum of 1 foot (0.3 m) with upstream mat on top to prevent uplifting by water or begin new rolls in a check slot. Anchor overlapped area by placing two rows of anchors, 1 foot (0.3 m) apart on 1 foot (0.3 m) intervals.  Place edges of outside mats in previously excavated longitudinal slots, anchor using prescribed staple pattern, backfill and compact soil.  Anchor, fill and compact upstream end of mat in a 12 inch (0.3 m) x 6 inch (0.2 m) terminal trench.  Secure mat to ground surface using U-shaped wire staples geotextile pins or wooden stakes.  Seed and fill turf reinforcement matting with soil, if specified. Soil filling if specified for turf reinforcement:  After seeding, spread and lightly rake 1/2-3/4 inches (12.7-19.1 mm) of fine topsoil into the mat apertures to completely fill mat thickness. Use backside of rake or other flat implement.  Spread topsoil using lightweight loader, backhoe, or other power equipment. Avoid sharp turns with equipment.  Do n