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HomeMy WebLinkAbout05.0 Drainage ReportPRELIMINARY PLAN S IL Lkk SPRING VALLEY RANCH P.U.D. GARFIELD COUNTY, COLORADO MARCH 9, 2007 PREPARED FOR: SPRING VALLEY HOLDINGS. LLC 4000 COUNTY ROAD 115 GLENWOOD SPRINGS, COLORADO 81601 PREPARED BY: MICHAEL GAMBA P.E. P.L.S. 28036 GAMBA & ASSOCIATES GAMBA & ASSOCIATES, INC. CONSULTING ENGINEERS & LAND SURVEYORS 970/945-2550 • WWW.GAMBAENGINEERING.COM 113 NINTH ST.. STE. 214 • V.O. 802 1438 • GLENWOOD SPRINGS. CO 81602 MAR 1 6 2007, V SPRING VALLEY RANCH PROJECT GARFIELD COUNTY, COLORADO PRELIMINARY DRAINAGE REPORT March 9, 2007 PREPARED FOR: Tom Gray Spring Valley Holding, LLC. 4000 County Road 115 Glenwood Springs, Colorado 81601 PREPARED BY: Gamba & Associates, Inc. Consulting Engineers and Land Surveyors 113 Ninth Street - Suite 214 Glenwood Springs, Colorado 81601 Phone: (970) 945-2550 Fax: (970) 945-1410 Michael Gamba P.E. & P.L.S. 28036 TABLE OF CONTENTS INTRODUCTION AND LOCATION 3 PREVIOUS DRAINAGE STUDIES 3 HYDROLOGIC AREA 4 HYDROLOGIC CRITERIA AND METHODOLOGY 4 POST -DEVELOPMENT HYDROLOGIC CALCULATIONS AND MITIGATION OF PEAK RATE OF RUNOFF 5 ANALYSIS RESULTS 6 PROPOSED STORMWATER QUALITY MITIGATION 8 CONCLUSION 8 APPENDIX A - PRE AND POST -DEVELOPMENT DATA AND CALCULATION 9 Spring Valley Ranch PUD - Preliminary Plan Drainage Study March 9, 2007 Page 2 of 9 INTRODUCTION AND LOCATION This report was prepared to meet the requirements of the Garfield County Zoning Resolution, the Garfield County Subdivision Regulations, and the Garfield County Comprehensive Plan in regards to drainage issues for the Spring Valley Ranch Planned Unit Development (PUD) Preliminary Plan. The property is located approximately 5 miles due east of the city of Glenwood Springs. The majority of the property is tributary to the Roaring Fork River basin via Red Canyon Creek and Cattle Creek. A small portion of the property along the northern boundary is tributary to the Colorado River through Glenwood Canyon. The property is accessed via Garfield County Road 1 14, commonly known as the Colorado Mountain College (CMC) Road. The property borders federal lands to the north and west of the property. The majority of the northern boundary of the property borders the White River National Forest, and the majority of the western boundary of the property borders Bureau of Land Management (BLM) property. Along the southern and eastern boundaries the property borders other private lands. The proposed development improvements in the area analyzed include the following: 1. The development of a residential community consisting of primarily single-family structures. 2. The development of a community village center including a restaurant, fire station, Metro District buildings, general store, post office, community meeting facilities, and other associated structures. 3. The development of an 18 -hole world-class golf course, a 9 -hole par -three golf course, various other recreational amenities and associated structures. 4. The construction of the development infrastructure necessary to serve the proposed community including roads, trails, utility systems, and drainage infrastructure. PREVIOUS DRAINAGE STUDIES Gamba & Associates, Inc. (G&A) has prepared a previous drainage study for this property, dated December 21, 2000. The previous study was prepared for the PUD/Subdivision development plan currently approved for the property. This current drainage study was revised to reflect the proposed revisions to the development plan for the property. Spring Valley Ranch PUD - Preliminary Plan Drainage Study March 9, 2007 Page 3 of 9 HYDROLOGIC AREA For this analysis, we have delineated 18 separate primary tributary drainage basins. The pre -development boundaries for the tributary drainage basins are depicted on Pre - Developed Drainage Map. Post Developed drainage basins are often further divided into an area tributary to a stormwater detention basin and an area bypassing the basin. The post -development boundaries of the tributary drainage basins (tributary areas) are also depicted in greater detail in the Drainage Plan Set (D Sheets) included in the Spring Valley Ranch P.U.D. Exhibit 26. HYDROLOGIC CRITERIA AND METHODOLOGY Runoff flows for the different basins were calculated using the U.S. Department of Agriculture Soil Conservation Service Technical Release No. 20 methodology. The hydrologic calculations, reach attenuation calculations, and detention pond routing analysis calculations were performed with the HydroCAD release 8.00 software by HydroCAD Software Solutions LLC. The following data and calculations for both pre - development and post -development conditions for each of the 18 drainage basins are provided in the appendices: • Rainfall values • Drainage basin (watershed) areas • Hydrologic curve numbers • Times of concentrations • Travel time • Peak discharges • Calculated hydrographs for the pre -development conditions • Calculated hydrographs and proposed mitigation for post -development conditions The rate of runoff for 1 00 -year design frequency storm events were computed using the rain fall values for the Type 11 storm from the NOAA Atlas 2, Precipitation Frequency Atlas of the Western United States, Volume III -Colorado 1973. The Hydrologic Curve Numbers (HCN) for this analysis were determined from the best available information. HCN's are based on two factors, the hydrological soil type and the ground cover. For this analysis the hydrologic soil types (A, B, C or D) were determined from the U.S. Soil Conservation Service (SCS) maps of the specific area. The determination of the ground cover during pre -development conditions was based on the vegetation cover for the site, which was mapped by a botanist based on an on-site survey. The vegetation map for the site is included separately in the preliminary plan submittal. The ground cover for post -development conditions was modified from the pre - Spring Valley Ranch PUD - Preliminary Plan Drainage Study March 9, 2007 Page 4 of 9 development conditions by incorporating the affects of the development, including roads, structures, golf courses, etc. The T.R. 20 method requires the calculation of the times of concentration (Tc) of each basin and a subsequent travel time (Tt) from the basin outfall to the composite watershed outfall point. The Tc for each basin is calculated based on the type of flow, and the length, grade, roughness and geometry of the flowpath of the overland flow from the hydraulically most distant point in the basin to the outfall point. The overland flows for each sub area were broken into three categories of flow types as they applied to each specific basin. The three flow types are sheet flow, shallow concentrated flow, and channel flow. The individual calculations for the times of concentration based on the various flow types are provided for all basins and storm events in the appendices. In this analysis, each watershed outfall is a separate outfall point for an independent flow. Travel times are typically used when multiple tributary areas flow into one watershed outfall point. Therefore, with the one exception of Watershed L, travel times were not required in these calculations. The values of Tc and Tt are provided in Appendix A. Based on the input of the rainfall values, the drainage basin areas, hydrologic curve numbers, times of concentration and travel time, the computer model calculates a hydrograph providing the calculated rates of stormwater runoff over a specific time period. The computer model also calculates the peak rate of runoff. The rainfall values, drainage basin areas, hydrologic curve numbers, times of concentrations, travel times, peak discharges, and the calculated hydrographs for both pre -development conditions are provided in Appendix A. POST -DEVELOPMENT HYDROLOGIC CALCULATIONS AND MITIGATION OF PEAK RATE OF RUNOFF Methods similar to pre -development are used for post -development analysis. The boundaries of the post -development tributary areas (watersheds) differ from the pre - development tributary area boundaries due to the capture and diversion of certain areas based on the development infrastructure such as roads, driveways and structures. Also as briefly described above, in some instances, the post development tributary areas (watersheds) have been further divided compared to the pre -development analysis. In areas where stormwater detention basins are proposed to mitigate runoff, the pre - development watersheds are divided into areas tributary to the detention basin and areas bypassing the detention basin. Hydrographs are calculated for each sub -area, and then are combined at the watershed outfall point. The post -development Hydrologic Curve Numbers (HCN) were determined from the hydrological soil type and the post -development ground cover. The ground cover for Spring Valley Ranch PUD - Preliminary Plan Drainage Study March 9, 2007 Page 5 of 9 post -development conditions was modified from the pre -development conditions by incorporating the affects of the development, including roads, driveways, structures, golf courses, etc. The following assumptions for impervious area and irrigated lawn area for each lot within a particular zone district have been used in this analysis for the determination of the post -development HCN's: • Mountain Lots: 27,500 s.f. impervious area 4,000 s.f. irrigated lawn • Ranch Lots: 13,500 s.f. impervious area 2,500 s.f. irrigated lawn • Pasture Lots: 20,000 s.f. impervious area 4,000 s.f. irrigated lawn • Estate Lots: 9,500 s.f. impervious area 2,500 s.f. irrigated lawn • Cabin Lots: 5,000 s.f. impervious area 2000 s.f. irrigated lawn The post -development ground cover conditions for all other areas of development were based on site specific estimates of the proposed future development. The post -development Tc for each basin was calculated based on the type of flow, length, grade, roughness and geometry of the anticipated post -developed flowpath of the overland flow from the hydraulically most distant point in the basin to the outfall point. The individual calculations for the times of concentration based on the various flow types are provided for all basins and storm events in the appendices. Again, based on the input of the post -development hydrologic data, the computer model calculates a hydrograph as well as the peak rate of runoff. The hydrologic input data as well as the calculated results for the post -development conditions are provided in Appendix A. In the event the post -development peak rate of runoff exceeds the pre -development peak rate of runoff for a particular outfall point, then some form of mitigation is proposed. The mitigation is intended to reduce the post -developed peak rate of runoff to a level equal to or less than the pre -developed peak rate of runoff. The post -developed peak rates of runoff were mitigated on site via several different methods. The typical method for mitigating peak discharge is through the development of stormwater detention basins. These detention basins detain the increased post - development peak discharges and release stormwater flows at a rate intended to model pre -development conditions. This method is proposed in all watersheds with the exception of Areas F, G, I, and K. The proposed mitigation of watersheds F, G, I and K are provided below. ANALYSIS RESULTS Following are the resulting calculations for the pre -development peak rates of flow for each watershed and the mitigated post -development flows for the 100 -year storm event. Spring Valley Ranch PUD - Preliminary Plan Drainage Study March 9, 2007 Page 6 of 9 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Watershed or Tributary- Area Pre- Development Area (Acres) Pre- Development Peak Flow from the 100- Year Storm (CFS) Post- Development Area (Acres) Post- Development Bypass Area (Acres) Post - Development Peak Flow from the 100- Year Storm (CFS) Area -A 1623.01 168.08 689.09 934.79 159.92 Area -B 163.63 21.95 168.64 0.50 21.09 Area -C 65.26 24.31 58.46 9.20 21.75 Area -D 104.32 34.00 83.99 20.34 25.34 Area -E 198.35 18.20 162.27 36.41 14.2 Area -F 96.02 4.15 101.60 0.0 6.96 Area -G 302.08 23.44 297.42 n/a 22.15 Area -H 209.03 77.25 182.36 29.53 60.5 Area -I 116.98 36.36 110.12 0.0 38.07 Area -J-1 1772.90 176.97 747.44 1030.22 175.69 Area -J-2 677.60 116.09 664.87 15.84 105.52 Area -K 86.98 8.72 85.53 0.0 13.33 Area -L 193.08 47.23 69.43 123.79 47.19 Area -M 292.01 65.24 152.35 79.35 36.44 Area -N 94.02 25.10 49.64 77.43 23.79 Area -O 108.13 21.90 103.35 20.37 19.94 Area -P-1 228.69 22.69 201.59 28.73 20.79 Area -P-2 54.37 12.21 38.40 15.97 10.62 As shown above the proposed detention basins effectively mitigate flows for the majority of the watersheds within the site. In several tributary areas, the ability to construct functional detention basins was severely limited due to the steep topography and poor accessibility. In Watershed F the post developed peak rate of runoff exceeds the pre -developed peak by 2.81 cfs. The topography in this area severely limited the feasibility and functionality of the installation of a detention basin. This watershed is a small tributary that flows north from the property onto U.S. Forest Service property, ultimately entering the Colorado River in Glenwood Canyon. The increased flow is not channelized as it leaves the property and effectively leaves the site as shallow concentrated flows causing little or no additional disturbance. The minimal increase in runoff of 2.81 cfs poses no threat to public property or the environment. Also, this small increase in runoff is mostly mitigated through the adjacent Watershed G, which also flows north toward the Colorado River. For these reasons, we believe that there is no need to mitigate this minor increase in flows. In Watershed G, although a detention basin is not proposed, the post -developed peak rate of runoff is Tess than the pre -developed peak -rate of runoff due to the reduction in Spring Valley Ranch PUD - Preliminary Plan Drainage Study March 9, 2007 Page 7 of 9 the tributary area resulting from the construction of roads and storm drainage conveyance structures. Therefore, Watershed G does not require any further mitigation. In Watersheds I and K the topography again limits the ability to construct and maintain functional detention basins. These basins both lie directly north of CR 115 and flow south to the county road. Due to the undesirability of constructing a single detention structure within either of these watersheds, we propose the development of on-site detention within each individual lot located within these watersheds. For Watershed I Cabin Lots C166 -C186 will be required to infiltrate or detain a net 1.71 cfs, which is equivalent to 0.086 cfs/lot. In order to be conservative a design flow of .15 cfs was used to size on -lot detention structures. The combination of these individual facilities will mitigate the volumetric increase of .06 Ac -ft, or 2613 cubic feet (cf) for the entire basin. Each lot will be required to place a detention structure that detains 131 cf or 977gallons of storage. In Watershed K Lots R-33, R-34 and R-35 will be required to infiltrate or detain a 4.61 cfs increase in the peak rate of runoff. There are two options for basin K. The first option is to convey the increased flows across the County Road and then construct a detention basin south of C.R. 115 within the property. The other option is to use on lot detention similar to Watershed I. Under this alternative, the lots within Area K would be required to mitigate the 4.61 cfs increase of the peak flow, or 1.54 cfs per lot. PROPOSED STORMWATER QUALITY MITIGATION Appropriate erosion control measures and Best Management Practices (BMP's) will be incorporated into the development plan and employed throughout the development process in order to appropriately mitigate the quality of stormwater runoff. As required by the Colorado Department of Public Health and Environment, Storm Water Management Plans will be prepared prior to the commencement of each phase of construction. The specific erosion control measures and BMP's to be utilized will be provided in conjunction with the preparation of the final construction plans for each phase of construction on the site. CONCLUSION These hydrologic calculations demonstrate that the post -development peak rates of runoff for the 100 -year storm event can be mitigated to levels below the pre -development conditions for the Spring Valley Ranch PUD by constructing the storm water mitigation measures as proposed herein. Spring Valley Ranch PUD - Preliminary Plan Drainage Study March 9, 2007 Page 8 of 9 APPENDIX A PRE AND POST -DEVELOPMENT DATA AND CALCULATION Spring Valley Ranch PUD - Preliminary Plan Drainage Study March 9, 2007 Page 9 of 9 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 4_ubca Reach Area -A PRE Drainage Diagram for Pre -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Pre -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres1 CN Description (subcats) 6.445 51 Sagebrush range, Fair, HSG B (1S) 393.933 56 Brush, Fair, HSG B (1S) 369.893 57 Oak/aspen range, Fair, HSG C (1S) 0.648 58 Meadow, non -grazed, HSG B (1S) 23.866 63 Sagebrush range, Fair, HSG C (1S) 55.944 69 Pasture/grassland/range, Fair, HSG B (1S) 618.607 70 Brush, Fair, HSG C (1S) 9.059 71 Meadow, non -grazed, HSG C (1S) 111.593 77 Woods, Poor, HSG C (1S) 33.025 79 Pasture/grassland/range, Fair, HSG C (1S) 1,623.013 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Type 11 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=5.00-24.00 hrs, dt=0.05 hrs, 381 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Area -A Runoff Area=1,623.013 ac Runoff Depth>0.33" Flow Length=15,618' Tc=68.5 min CN=64 Runoff=168.08 cfs 44.948 af Total Runoff Area = 1,623.013 ac Runoff Volume = 44.948 af Average Runoff Depth = 0.33" 100.00% Pervious Area = 1,623.013 ac 0.00% Impervious Area = 0.000 ac Pre -Development Type 11 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 4 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 1S: Area -A Runoff = 168.08 cfs @ 12.94 hrs, Volume= 44.948 af, Depth> 0.33" Runoff by SCS TR -20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 YEAR Rainfall=2.70" Area (ac) CN Description 369.893 57 393.933 56 618.607 70 55.944 69 33.025 79 6.445 51 23.866 63 0.648 58 9.059 71 111.593 77 Oak/aspen range, Fair, HSG C Brush, Fair, HSG B Brush, Fair, HSG C Pasture/grassland/range, Fair, HSG B Pasture/grassland/range, Fair, HSG C Sagebrush range, Fair, HSG B Sagebrush range, Fair, HSG C Meadow, non -grazed, HSG B Meadow, non -grazed, HSG C Woods, Poor, HSG C 1,623.013 64 1,623.013 Tc (min) Weighted Average Pervious Area Length Slope (feet) (ft/ft) Velocity Capacity (ft/sec) (cfs) Description 41.3 15.0 12.2 100 0.0120 6,763 0.2180 8,755 0.0750 0.04 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 7.52 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 11.96 86.09 Channel Flow, Area= 7.2 sf Perim= 8.7' r= 0.83' n= 0.030 68.5 15,618 Total 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 YEAR Rainfall=2.70" Page 5 3/6/2007 Subcatchment 1S: Area -A Hydrograph 180= 170: 160 150 140= 130= 120- 110= a 1.3 100_ 0 90= LL 80 = 70= 60 50- 40= 30= 20= 10: 021 5 168.08 cfs I Type II 24 -hr 100 YEAR Rainfall=2.70" Runoff Area=1,623.013 ac Runoff Volume=44.948 of Runoff Depth>0.33" Flow Length=15,618' Tc=68.5 min CN=64 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff Pre -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 YEAR Rainfall=2.70" Page 6 3/6/2007 Time (hours) 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 Precip. (inches) 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 2.12 2.16 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2.43 2.45 2.46 2.47 2.49 Excess (inches) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.07 0.10 0.11 0.13 0.14 0.15 0.16 0.17 0.18 0.18 0.19 0.20 0.20 0.21 0.22 0.22 0.23 0.23 0.24 0.24 0.25 0.25 0.26 0.26 0.27 Hydrograph for Subcatchment 1S: Area -A Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.78 29.23 99.27 155.92 167.16 144.63 119.32 100.54 86.07 75.01 66.21 59.40 54.39 50.61 47.65 45.02 42.65 40.52 38.47 36.57 35.08 33.88 32.88 32.06 31.24 Time (hours) 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess (inches) 0.27 0.27 0.28 0.28 0.29 0.29 0.29 0.30 0.30 0.30 0.31 0.31 0.31 0.31 0.32 0.32 0.32 0.33 0.33 0.33 0.34 0.34 0.34 0.34 Runoff (cfs) 30.46 29.71 28.91 28.13 27.35 26.50 25.68 24.84 23.95 23.12 22.37 21.78 21.40 21.10 20.88 20.72 20.55 20.40 20.28 20.12 19.99 19.86 19.70 19.57 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Subcat Reach Area- A -Pond 1 Pond -A Homestead Area-A-bypa s 73R A -outfall Drainage Diagram for Post -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroCAD® 8.00 sln 004370 © 2006 HydroCAD Software Solutions LLC Post -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 5.304 51 Sagebrush range, Fair, HSG B (69S) 347.481 56 Brush, Fair, HSG B (69S) 344.795 57 Oak/aspen range, Fair, HSG C (68S,69S) 0.651 58 Meadow, non -grazed, HSG B (69S) 6.221 61 >75% Grass cover, Good, HSG B (69S) 17.105 63 Sagebrush range, Fair, HSG C (69S) 53.817 69 Pasture/grassland/range, Fair, HSG B (69S) 568.803 70 Brush, Fair, HSG C (68S,69S) 8.391 71 Meadow, non -grazed, HSG C (68S,69S) 109.873 73 Woods, Fair, HSG C (68S,69S) 40.894 74 >75% Grass cover, Good, HSG C (68S,69S) 17.508 79 Pasture/grassland/range, Fair, HSG C (68S,69S) 103.029 98 Paved roads w/curbs & sewers (68S,69S) 1,623.872 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 68S: Area-A-Pond1 Runoff Area=689.087 ac Runoff Depth>0.40" Flow Length=11,768' Tc=56.1 min CN=66 Runoff=105.92 cfs 22.842 af Subcatchment 69S: Area -A -bypass Runoff Area=934.785 ac Runoff Depth>0.40" Flow Length=16,779' Tc=57.9 min CN=66 Runoff=140.49 cfs 30.958 af Reach 73R: Reach -A Avg. Depth=1.23' Max Vel=8.16 fps Inflow=33.61 cfs 22.815 of n=0.030 L=7,670.1' S=0.0564 '/' Capacity=358.67 cfs Outflow=33.55 cfs 22.341 af Pond 71P: Pond -A Homestead Peak Elev=7,627.44' Storage=5.801 af Inflow=105.92 cfs 22.842 af Outflow=33.61 cfs 22.815 af Link 72L: A -outfall Inflow=159.92 cfs 53.299 af Primary=159.92 cfs 53.299 af Total Runoff Area = 1,623.872 ac Runoff Volume = 53.800 af Average Runoff Depth = 0.40" 93.66% Pervious Area = 1,520.843 ac 6.34% Impervious Area = 103.029 ac Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 4 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 68S: Area-A-Pondl Runoff = 105.92 cfs @ 12.71 hrs, Volume= 22.842 af, Depth> 0.40" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 300.382 57 Oak/aspen range, Fair, HSG C 289.470 70 Brush, Fair, HSG C 10.647 79 Pasture/grassland/range, Fair, HSG C 8.109 71 Meadow, non -grazed, HSG C 9.980 73 Woods, Fair, HSG C 35.169 74 >75% Grass cover, Good, HSG C 35.330 98 Paved roads w/curbs & sewers 689.087 66 Weighted Average 653.757 Pervious Area 35.330 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.5 100 0.0696 0.08 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 2.7 1,067 0.1671 6.58 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 1.5 949 0.0528 10.52 84.18 Channel Flow, Area= 8.0 sf Perim= 9.0' r= 0.89' n= 0.030 3.1 984 0.1208 5.21 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 2.3 1,864 0.0845 13.31 106.49 Channel Flow, Area= 8.0 sf Perim= 9.0' r= 0.89' n= 0.030 3.2 1,594 0.2635 8.26 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.7 433 0.0551 10.75 85.99 Channel Flow, Area= 8.0 sf Perim= 9.0' r= 0.89' n= 0.030 6.3 2,932 0.2285 7.70 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 15.8 1,845 0.0333 1.95 2.73 Channel Flow, Area= 1.4 sf Perim= 14.0' r= 0.10' n= 0.030 56.1 11,768 Total Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 5 3/6/2007 Subcatchment 68S: Area-A-Pondl Hydrograph 115 110- 1054 100= 95. 90. 85= 80= 75 704 651 607 55. 50 453 403 35- 30- 25, 5-30.25, 20- 15- 10 5= Type 1124 -hr 100 Year Rainfall=2.70" Runoff Area=689.087 ac Runoff Volume=22.842 of Runoff Depth>0.40" Flow Length=11,768' Tc=56.1 min CN=66 105.92 cfs 1 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 6 3/6/2007 Time (hours) 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 Precip. (inches) 0.00 0.01 0.01 0.02 0.03 0.04 0.04 0.05 0.06 0.07 0.08 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 Excess (inches) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.13 0.15 0.17 0.18 Hydrograph for Subcatchment 68S: Area-A-Pond1 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.62 35.87 90.99 105.43 86.63 Time (hours) 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.12 2.16 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2.43 2.45 2.46 2.47 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess (inches) 0.19 0.20 0.21 0.22 0.23 0.24 0.25 0.25 0.26 0.27 0.27 0.28 0.28 0.29 0.30 0.30 0.31 0.31 0.32 0.32 0.33 0.33 0.33 0.34 0.34 0.35 0.35 0.35 0.36 0.36 0.37 0.37 0.37 0.38 0.38 0.38 0.39 0.39 0.39 0.40 0.40 0.40 0.41 0.41 Runoff (cfs) 66.93 53.34 44.08 37.50 32.68 28.96 26.26 24.23 22.78 21.64 20.61 19.60 18.59 17.62 16.80 16.18 15.70 15.29 14.91 14.54 14.17 13.80 13.42 13.03 12.64 12.24 11.83 11.42 11.00 10.60 10.28 10.07 9.93 9.83 9.75 9.67 9.60 9.54 9.47 9.40 9.33 9.27 9.20 9.12 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 7 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 69S: Area -A -bypass Runoff = 140.49 cfs @ 12.73 hrs, Volume= 30.958 af, Depth> 0.40" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 44.413 57 Oak/aspen range, Fair, HSG C 347.481 56 Brush, Fair, HSG B 279.333 70 Brush, Fair, HSG C 53.817 69 Pasture/grassland/range, Fair, HSG B 6.861 79 Pasture/grassland/range, Fair, HSG C 5.304 51 Sagebrush range, Fair, HSG B 17.105 63 Sagebrush range, Fair, HSG C 0.651 58 Meadow, non -grazed, HSG B 0.282 71 Meadow, non -grazed, HSG C 99.893 73 Woods, Fair, HSG C 6.221 61 >75% Grass cover, Good, HSG B 5.725 74 >75% Grass cover, Good, HSG C 67.699 98 Paved roads w/curbs & sewers 934.785 66 Weighted Average 867.086 Pervious Area 67.699 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 19.7 100 0.0769 0.08 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 4.5 1,750 0.1620 6.48 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 1.6 1,039 0.0546 10.70 85.60 Channel Flow, Area= 8.0 sf Perim= 9.0' r= 0.89' n= 0.030 4.7 2,150 0.2278 7.68 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 1.0 653 0.0569 10.92 87.39 Channel Flow, Area= 8.0 sf Perim= 9.0' r= 0.89' n= 0.030 11.3 4,773 0.1902 7.02 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 15.1 6,314 0.0551 6.98 18.86 Channel Flow, Area= 2.7 sf Perim= 5.8' r= 0.47' n= 0.030 57.9 16,779 Total Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 8 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 69S: Area -A -bypass Hydrograph 150= 140= 130 120- 110- 100- • 90- • 80- 20110-100-90-ao- • 70- 70- 50: 50= 40- 30- 20-2 0330-20- 10- 0 140.49 cfs Type II 24 -hr 100 Year Rainfall=2.70" Runoff Area=934.785 ac Runoff Volume=30.958 of Runoff Depth>0.40" Flow Length=16,779' Tc=57.9 min CN=66 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 2.2 23 24 Time (hours) — Runoff 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 9 3/6/2007 Time Precip. (hours) (inches) 0.00 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 0.01 0.01 0.02 0.03 0.04 0.04 0.05 0.06 0.07 0.08 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 Hydrograph for Subcatchment 69S: Area -A -bypass Excess (inches) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.13 0.15 0.17 0.18 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.20 44.22 116.69 140.39 119.63 Time (hours) 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.12 2.16 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2.43 2.45 2.46 2.47 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess (inches) 0.19 0.20 0.21 0.22 0.23 0.24 0.25 0.25 0.26 0.27 0.27 0.28 0.28 0.29 0.30 0.30 0.31 0.31 0.32 0.32 0.33 0.33 0.33 0.34 0.34 0.35 0.35 0.35 0.36 0.36 0.37 0.37 0.37 0.38 0.38 0.38 0.39 0.39 0.39 0.40 0.40 0.40 0.41 0.41 Runoff (cfs) 92.60 74.01 61.12 51.92 45.16 39.96 36.12 33.31 31.17 29.57 28.13 26.75 25.37 24.04 22.90 22.03 21.36 20.79 20.27 19.76 19.26 18.76 18.25 17.74 17.21 16.67 16.12 15.55 14.98 14.44 14.00 13.69 13.49 13.34 13.22 13.12 13.03 12.94 12.85 12.76 12.67 12.58 12.48 12.39 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 10 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Reach 73R: Reach -A Inflow Area = 689.087 ac, Inflow Depth > 0.40" for 100 Year event Inflow = 33.61 cfs @ 14.20 hrs, Volume= 22.815 af Outflow = 33.55 cfs @ 14.68 hrs, Volume= 22.341 af, Atten= 0%, Lag= 29.1 min Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Max. Velocity= 8.16 fps, Min. Travel Time= 15.7 min Avg. Velocity = 7.11 fps, Avg. Travel Time= 18.0 min Peak Storage= 31,527 cf @ 14.42 hrs, Average Depth at Peak Storage= 1.23' Bank -Full Depth= 3.00', Capacity at Bank -Full= 358.67 cfs 0.00' x 3.00' deep channel, n= 0.030 Side Slope Z -value= 3.0 2.4 '/' Top Width= 16.20' Length= 7,670.1' Slope= 0.0564 '/' Inlet Invert= 7,618.50', Outlet Invert= 7,186.00' 36 34- 32 30- 28 26 24- 22- N 13 20- c 18 LL 16- 14 12: 10- 8 6 4- 2 0 Reach 73R: Reach -A Hydrograph Inflow Area=689.087 ac Avg. Depth=1.23' Max Vel=8.16 fps n=0.030 L=7,670.1' S=0.0564 '/' Capacity=358.67 cfs 33.55 cfs 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Inflow — Outflow — Storage 1 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 11 3/6/2007 m n 3 2- Reach 73R: Reach -A Stage -Discharge 0� 3 0 50 100 150 200 Discharge (cfs) 250 300 350 Reach 73R: Reach -A Stage -Storage 2- 0 , 0 20,000 40,000 60,000 80,000 100,000 120,000 140,060 160.000 180.000 Storage (cubic -feet) — Primary Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 12 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Hydrograph for Reach 73R: Reach -A Time Inflow Storage Elevation Outflow (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 7,618.50 0.00 0.50 0.00 0 7,618.50 0.00 1.00 0.00 0 7,618.50 0.00 1.50 0.00 0 7,618.50 0.00 2.00 0.00 0 7,618.50 0.00 2.50 0.00 0 7,618.50 0.00 3.00 0.00 0 7,618.50 0.00 3.50 0.00 0 7,618.50 0.00 4.00 0.00 0 7,618.50 0.00 4.50 0.00 0 7,618.50 0.00 5.00 0.00 0 7,618.50 0.00 5.50 0.00 0 7,618.50 0.00 6.00 0.00 0 7,618.50 0.00 6.50 0.00 0 7,618.50 0.00 7.00 0.00 0 7,618.50 0.00 7.50 0.00 0 7,618.50 0.00 8.00 0.00 0 7,618.50 0.00 8.50 0.00 0 7,618.50 0.00 9.00 0.00 0 7,618.50 0.00 9.50 0.00 0 7,618.50 0.00 10.00 0.00 0 7,618.50 0.00 10.50 0.00 0 7,618.50 0.00 11.00 0.00 0 7,618.50 0.00 11.50 0.00 0 7,618.50 0.00 12.00 1.55 263 7,618.61 0.00 12.50 27.18 20,841 7,619.50 5.71 13.00 30.71 28,008 7,619.66 25.22 13.50 32.83 30,431 7,619.71 30.62 14.00 33.56 31,349 7,619.73 32.80 14.50 33.51 31,522 7,619.73 33.51 15.00 33.06 31,310 7,619.73 33.45 15.50 32.44 30,912 7,619.72 33.00 16.00 31.74 30,437 7,619.71 32.38 16.50 31.01 29,925 7,619.70 31.68 17.00 30.25 29,385 7,619.69 30.94 17.50 29.50 28,842 7,619.68 30.19 18.00 28.79 28,317 7,619.67 29.45 18.50 28.10 27,806 7,619.66 28.74 19.00 27.43 27,307 7,619.65 28.06 19.50 26.77 26,817 7,619.64 27.39 20.00 11.66 22,162 7,619.53 26.73 20.50 10.65 14,731 7,619.34 14.71 21.00 10.09 13,217 7,619.30 11.13 21.50 9.84 12,722 7,619.28 10.22 22.00 9.68 12,500 7,619.28 9.88 22.50 9.54 12,349 7,619.27 9.70 23.00 9.41 12,216 7,619.27 9.55 23.50 9.27 12,084 7,619.26 9.42 24.00 9.13 11,949 7,619.26 9.28 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 13 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Elevation Velocity Discharge (feet) (ft/sec) (cfs) 7,618.50 7,618.52 7,618.54 7,618.56 7,618.58 7,618.60 7,618.62 7,618.64 7,618.66 7,618.68 7,618.70 7,618.72 7,618.74 7,618.76 7,618.78 7,618.80 7,618.82 7,618.84 7,618.86 7,618.88 7,618.90 7,618.92 7,618.94 7,618.96 7,618.98 7,619.00 7,619.02 7,619.04 7,619.06 7,619.08 7,619.10 7,619.12 7,619.14 7,619.16 7,619.18 7,619.20 7,619.22 7,619.24 7,619.26 7,619.28 7,619.30 7,619.32 7,619.34 7,619.36 7,619.38 7,619.40 7,619.42 7,619.44 7,619.46 7,619.48 7,619.50 7,619.52 7,619.54 0.00 0.46 0.82 1.09 1.31 1.53 1.73 1.91 2.09 2.26 2.43 2.58 2.74 2.89 3.04 3.18 3.32 3.46 3.59 3.72 3.85 3.98 4.10 4.23 4.35 4.47 4.59 4.71 4.82 4.93 5.05 5.16 5.27 5.38 5.49 5.59 5.70 5.81 5.91 6.01 6.11 6.22 6.32 6.42 6.52 6.61 6.71 6.81 6.91 7.00 7.10 7.19 7.28 Stage -Discharge for Reach 73R: Reach -A 0.00 0.00 0.00 0.01 0.02 0.04 0.07 0.10 0.15 0.20 0.26 0.34 0.43 0.53 0.65 0.77 0.92 1.08 1.26 1.46 1.67 1.90 2.15 2.42 2.71 3.02 3.36 3.70 4.09 4.49 4.91 5.36 5.83 6.33 6.86 7.41 7.98 8.59 9.22 9.88 10.57 11.29 12.03 12.82 13.63 14.47 15.35 16.25 17.18 18.16 19.17 20.20 21.28 Elevation Velocity Discharge (feet) (ft/sec) (cfs) 7,619.56 7.38 22.39 7,619.58 7.47 23.52 7,619.60 7.56 24.71 7,619.62 7.65 25.93 7,619.64 7.74 27.17 7,619.66 7.83 28.47 7,619.68 7.92 29.80 7,619.70 8.01 31.15 7,619.72 8.10 32.57 7,619.74 8.19 34.01 7,619.76 8.28 35.48 7,619.78 8.37 37.02 7,619.80 8.45 38.58 7,619.82 8.54 40.17 7,619.84 8.62 41.82 7,619.86 8.71 43.51 7,619.88 8.80 45.22 7,619.90 8.88 47.00 7,619.92 8.96 48.82 7,619.94 9.05 50.66 7,619.96 9.13 52.57 7,619.98 9.22 54.51 7,620.00 9.30 56.49 7,620.02 9.38 58.53 7,620.04 9.46 60.60 7,620.06 9.54 62.71 7,620.08 9.63 64.89 7,620.10 9.71 67.11 7,620.12 9.79 69.35 7,620.14 9.87 71.67 7,620.16 9.95 74.03 7,620.18 10.03 76.42 7,620.20 10.11 78.88 7,620.22 10.19 81.38 7,620.24 10.27 83.91 7,620.26 10.34 86.52 7,620.28 10.42 89.17 7,620.30 10.50 91.85 7,620.32 10.58 94.61 7,620.34 10.65 97.41 7,620.36 10.73 100.25 7,620.38 10.81 103.16 7,620.40 10.89 106.11 7,620.42 10.96 109.10 7,620.44 11.04 112.17 7,620.46 11.11 115.28 7,620.48 11.19 118.43 7,620.50 11.26 121.66 7,620.52 11.34 124.94 7,620.54 11.41 128.25 7,620.56 11.49 131.64 7,620.58 11.56 135.08 7,620.60 11.64 138.55 Elevation Velocity Discharge (feet) (ft/sec) (cfs) 7,620.62 11.71 142.11 7,620.64 11.78 145.72 7,620.66 11.86 149.36 7,620.68 11.93 153.09 7,620.70 12.00 156.87 7,620.72 12.08 160.68 7,620.74 12.15 164.59 7,620.76 12.22 168.54 7,620.78 12.29 172.53 7,620.80 12.36 176.61 7,620.82 12.44 180.73 7,620.84 12.51 184.90 7,620.86 12.58 189.16 7,620.88 12.65 193.47 7,620.90 12.72 197.82 7,620.92 12.79 202.26 7,620.94 12.86 206.75 7,620.96 12.93 211.28 7,620.98 13.00 215.91 7,621.00 13.07 220.58 7,621.02 13.14 225.30 7,621.04 13.21 230.12 7,621.06 13.28 234.98 7,621.08 13.35 239.89 7,621.10 13.42 244.90 7,621.12 13.49 249.96 7,621.14 13.55 255.06 7,621.16 13.62 260.26 7,621.18 13.69 265.51 7,621.20 13.76 270.81 7,621.22 13.83 276.21 7,621.24 13.89 281.66 7,621.26 13.96 287.16 7,621.28 14.03 292.76 7,621.30 14.10 298.41 7,621.32 14.16 304.11 7,621.34 14.23 309.91 7,621.36 14.30 315.77 7,621.38 14.36 321.67 7,621.40 14.43 327.68 7,621.42 14.50 333.74 7,621.44 14.56 339.85 7,621.46 14.63 346.07 7,621.48 14.69 352.34 7,621.50 14.76 358.67 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 14 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Stage -Area -Storage for Reach 73R: Reach -A Elevation End -Area Storage (feet) (sq -ft) (cubic -feet) 7,618.50 7,618.55 7,618.60 7,618.65 7,618.70 7,618.75 7,618.80 7,618.85 7,618.90 7,618.95 7,619.00 7,619.05 7,619.10 7,619.15 7,619.20 7,619.25 7,619.30 7,619.35 7,619.40 7,619.45 7,619.50 7,619.55 7,619.60 7,619.65 7,619.70 7,619.75 7,619.80 7,619.85 7,619.90 7,619.95 7,620.00 7,620.05 7,620.10 7,620.15 7,620.20 7,620.25 7,620.30 7,620.35 7,620.40 7,620.45 7,620.50 7,620.55 7,620.60 7,620.65 7,620.70 7,620.75 7,620.80 7,620.85 7,620.90 7,620.95 7,621.00 7,621.05 7,621.10 0.0 0 0.0 56 0.0 211 0.1 466 0.1 833 0.2 1,298 0.2 1,864 0.3 2,541 0.4 3,318 0.5 4,194 0.7 5,181 0.8 6,269 1.0 7,455 1.1 8,754 1.3 10,152 1.5 11,649 1.7 13,258 2.0 14,967 2.2 16,775 2.4 18,694 2.7 20,713 3.0 22,832 3.3 25,062 3.6 27,392 3.9 29,821 4.2 32,362 4.6 35,003 4.9 37,743 5.3 40,594 5.7 43,545 6.1 46,596 6.5 49,758 6.9 53,020 7.4 56,381 7.8 59,854 8.3 63,426 8.7 67,098 9.2 70,882 9.7 74,765 10.3 78,747 10.8 82,841 11.3 87,035 11.9 91,328 12.5 95,733 13.1 100,237 13.7 104,841 14.3 109,556 14.9 114,371 15.6 119,285 16.2 124,312 16.9 129,437 17.6 134,662 18.3 139,999 Elevation End -Area Storage (feet) (sq -ft) (cubic -feet) 7,621.15 19.0 145,435 7,621.20 19.7 150,971 7,621.25 20.4 156,618 7,621.30 21.2 162,365 7,621.35 21.9 168,211 7,621.40 22.7 174,169 7,621.45 23.5 180,227 7,621.50 24.3 186,383 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 15 3/6/2007 Inflow Area = Inflow = Outflow = Primary = Pond 71P: Pond -A Homestead 689.087 ac, Inflow Depth > 0.40" 105.92 cfs @ 12.71 hrs, Volume= 33.61 cfs @ 14.20 hrs, Volume= 33.61 cfs @ 14.20 hrs, Volume= for 100 Year event 22.842 af 22.815 af, Atten= 68%, Lag= 89.5 min 22.815 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 7,627.44' @ 14.20 hrs Surf.Area= 4.129 ac Storage= 5.801 af Plug -Flow detention time= 69.5 min calculated for 22.815 af (100% of inflow) Center -of -Mass det. time= 68.9 min ( 1,008.4 - 939.5 ) Volume Invert Avail.Storage Storage Description #1 7,626.00' 8.138 af Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre-feet) (acre-feet) 3.933 0.000 0.000 4.205 8.138 8.138 7,626.00 7,628.00 Device Routing Invert Outlet Devices #1 Primary 7,622.00' #2 Primary 7,626.00' 24.0" x 130.0' long Culvert CMP, square edge headwall, Ke= 0.500 Outlet Invert= 7,620.00' S= 0.0154 '/' Cc= 0.900 n= 0.012 30.0 deg x 2.00' rise Sharp -Crested Vee/Trap Weir C= 2.61 Primary OutFlow Max=33.61 cfs @ 14.20 hrs HW=7,627.44' (Free Discharge) '1=Culvert (Inlet Controls 31.87 cfs @ 10.14 fps) 2=Sharp-Crested Vee/Trap Weir (Weir Controls 1.74 cfs @ 3.13 fps) Inflow Area=689.087 ac Peak EIev=7,627.44' Storage=5.801 of 105.92 cfs 1 4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Inflow II — Primary — Primary` Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 16 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Pond 71P: Pond -A Homestead Hydrograph 11f 110 1057 100 95 90 85 80 75 704. 65= 60-7 55 50 45 40- 35- 30- 25, 0735.30.25' 20 15= 10 5 0 Elevation (feet) 7,628 7,627 Pond 71P: Pond -A Homestead Stage -Discharge 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 Discharge (cfs) 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 — Surface — Storage 1 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 17 3/6/2007 Elevation (feet) 0 7,628 ' 7,627- 1 Pond 71P: Pond -A Homestead Stage -Area -Storage Surface/Horizontal/Wetted Area (acres) 2 3 7,626- 0 1 2 3 . . . . . , 4 5 6 7 8 Storage (acre-feet) Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 18 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Hydrograph for Pond 71P: Pond -A Homestead Time Inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet) (cfs) 0.00 0.00 0.000 7,626.00 0.00 0.50 0.00 0.000 7,626.00 0.00 1.00 0.00 0.000 7,626.00 0.00 1.50 0.00 0.000 7,626.00 0.00 2.00 0.00 0.000 7,626.00 0.00 2.50 0.00 0.000 7,626.00 0.00 3.00 0.00 0.000 7,626.00 0.00 3.50 0.00 0.000 7,626.00 0.00 4.00 0.00 0.000 7,626.00 0.00 4.50 0.00 0.000 7,626.00 0.00 5.00 0.00 0.000 7,626.00 0.00 5.50 0.00 0.000 7,626.00 0.00 6.00 0.00 0.000 7,626.00 0.00 6.50 0.00 0.000 7,626.00 0.00 7.00 0.00 0.000 7,626.00 0.00 7.50 0.00 0.000 7,626.00 0.00 8.00 0.00 0.000 7,626.00 0.00 8.50 0.00 0.000 7,626.00 0.00 9.00 0.00 0.000 7,626.00 0.00 9.50 0.00 0.000 7,626.00 0.00 10.00 0.00 0.000 7,626.00 0.00 10.50 0.00 0.000 7,626.00 0.00 11.00 0.00 0.000 7,626.00 0.00 11.50 0.00 0.000 7,626.00 0.00 12.00 2.62 0.005 7,626.00 1.55 12.50 90.99 0.889 7,626.23 27.18 13.00 86.63 3.818 7,626.95 30.71 13.50 53.34 5.306 7,627.32 32.83 14.00 37.50 5.770 7,627.43 33.56 14.50 28.96 5.741 7,627.42 33.51 15.00 24.23 5.454 7,627.35 33.06 15.50 21.64 5.043 7,627.26 32.44 16.00 19.60 4.569 7,627.14 31.74 16.50 17.62 4.040 7,627.01 31.01 17.00 16.18 3.470 7,626.87 30.25 17.50 15.29 2.884 7,626.72 29.50 18.00 14.54 2.296 7,626.58 28.79 18.50 13.80 1.706 7,626.43 28.10 19.00 13.03 1.113 7,626.28 27.43 19.50 12.24 0.515 7,626.13 26.77 20.00 11.42 0.035 7,626.01 11.66 20.50 10.60 0.032 7,626.01 10.65 21.00 10.07 0.030 7,626.01 10.09 21.50 9.83 0.029 7,626.01 9.84 22.00 9.67 0.029 7,626.01 9.68 22.50 9.54 0.029 7,626.01 9.54 23.00 9.40 0.028 7,626.01 9.41 23.50 9.27 0.028 7,626.01 9.27 24.00 9.12 0.027 7,626.01 9.13 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 19 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Elevation Primary I (feet) (cfs) 7,626.00 0.00 7,626.01 26.24 I 7,626.02 26.29 7,626.03 26.33 7,626.04 26.37 7,626.05 26.42 I 7,626.06 26.46 7,626.07 26.51 7,626.08 26.55 7,626.09 26.59 I 7,626.10 26.64 7,626.11 26.68 7,626.12 26.72 I 7,626.13 26.77 7,626.14 26.81 7,626.15 26.85 7,626.16 26.90 I 7,626.17 26.94 7,626.18 26.98 7,626.19 27.03 7,626.20 27.07 I 7,626.21 27.12 7,626.22 27.16 7,626.23 27.20 7,626.24 27.25 I7,626.25 27.29 7,626.26 27.34 7,626.27 27.38 I 7,626.28 27.42 7,626.29 27.47 7,626.30 27.51 7,626.31 27.56 I 7,626.32 27.60 7,626.33 27.65 7,626.34 27.69 7,626.35 27.74 I 7,626.36 27.78 7,626.37 27.83 7,626.38 27.87 I 7,626.39 27.92 7,626.40 27.96 7,626.41 28.01 7,626.42 28.05 I 7,626.43 28.10 7,626.44 28.15 7,626.45 28.19 7,626.46 28.24 I 7,626.47 28.28 7,626.48 28.33 7,626.49 28.38 7,626.50 28.42 I7,626.51 28.47 7,626.52 28.52 1 Stage -Discharge for Pond 71P: Pond -A Homestead Elevation Primary (feet) (cfs) 7,626.53 7,626.54 7,626.55 7,626.56 7,626.57 7,626.58 7,626.59 7,626.60 7,626.61 7,626.62 7,626.63 7,626.64 7,626.65 7,626.66 7,626.67 7,626.68 7,626.69 7,626.70 7,626.71 7,626.72 7,626.73 7,626.74 7,626.75 7,626.76 7,626.77 7,626.78 7,626.79 7,626.80 7,626.81 7,626.82 7,626.83 7,626.84 7,626.85 7,626.86 7,626.87 7,626.88 7,626.89 7,626.90 7,626.91 7,626.92 7,626.93 7,626.94 7,626.95 7,626.96 7,626.97 7,626.98 7,626.99 7,627.00 7,627.01 7,627.02 7,627.03 7,627.04 7,627.05 28.56 28.61 28.66 28.71 28.75 28.80 28.85 28.90 28.94 28.99 29.04 29.09 29.14 29.19 29.24 29.28 29.33 29.38 29.43 29.48 29.53 29.58 29.63 29.68 29.73 29.79 29.84 29.89 29.94 29.99 30.04 30.09 30.15 30.20 30.25 30.30 30.36 30.41 30.46 30.52 30.57 30.62 30.68 30.73 30.79 30.84 30.90 30.95 31.01 31.06 31.12 31.18 31.23 Elevation Primary (feet) (cfs) 7,627.06 7,627.07 7,627.08 7,627.09 7,627.10 7,627.11 7,627.12 7,627.13 7,627.14 7,627.15 7,627.16 7,627.17 7,627.18 7,627.19 7,627.20 7,627.21 7,627.22 7,627.23 7,627.24 7,627.25 7,627.26 7,627.27 7,627.28 7,627.29 7,627.30 7,627.31 7,627.32 7,627.33 7,627.34 7,627.35 7,627.36 7,627.37 7,627.38 7,627.39 7,627.40 7,627.41 7,627.42 7,627.43 7,627.44 7,627.45 7,627.46 7,627.47 7,627.48 7,627.49 7,627.50 7,627.51 7,627.52 7,627.53 7,627.54 7,627.55 7,627.56 7,627.57 7,627.58 31.29 31.35 31.40 31.46 31.52 31.57 31.63 31.69 31.75 31.81 31.87 31.93 31.98 32.04 32.10 32.16 32.22 32.28 32.35 32.41 32.47 32.53 32.59 32.65 32.71 32.78 32.84 32.90 32.97 33.03 33.09 33.16 33.22 33.29 33.35 33.42 33.48 33.55 33.61 33.68 33.75 33.81 33.88 33.95 34.02 34.08 34.15 34.22 34.29 34.36 34.43 34.50 34.57 Elevation Primary (feet) (cfs) 7,627.59 7,627.60 7,627.61 7,627.62 7,627.63 7,627.64 7,627.65 7,627.66 7,627.67 7,627.68 7,627.69 7,627.70 7,627.71 7,627.72 7,627.73 7,627.74 7,627.75 7,627.76 7,627.77 7,627.78 7,627.79 7,627.80 7,627.81 7,627.82 7,627.83 7,627.84 7,627.85 7,627.86 7,627.87 7,627.88 7,627.89 7,627.90 7,627.91 7,627.92 7,627.93 7,627.94 7,627.95 7,627.96 7,627.97 7,627.98 7,627.99 7,628.00 34.64 34.71 34.78 34.85 34.92 34.99 35.06 35.14 35.21 35.28 35.36 35.43 35.50 35.58 35.65 35.73 35.80 35.88 35.95 36.03 36.10 36.18 36.26 36.34 36.41 36.49 36.57 36.65 36.73 36.81 36.88 36.96 37.04 37.12 37.21 37.29 37.37 37.45 37.53 37.61 37.70 37.78 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 20 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Stage -Area -Storage for Pond 71 P: Pond -A Homestead Elevation Surface Storage Elevation Surface Storage (feet) (acres) (acre-feet) (feet) (acres) (acre-feet) 7,626.00 3.933 0.000 7,627.06 4.077 4.245 7,626.02 3.936 0.079 7,627.08 4.080 4.327 7,626.04 3.938 0.157 7,627.10 4.083 4.409 7,626.06 3.941 0.236 7,627.12 4.085 4.490 7,626.08 3.944 0.315 7,627.14 4.088 4.572 7,626.10 3.947 0.394 7,627.16 4.091 4.654 7,626.12 3.949 0.473 7,627.18 4.093 4.736 7,626.14 3.952 0.552 7,627.20 4.096 4.818 7,626.16 3.955 0.631 7,627.22 4.099 4.899 7,626.18 3.957 0.710 7,627.24 4.102 4.981 7,626.20 3.960 0.789 7,627.26 4.104 5.064 7,626.22 3.963 0.869 7,627.28 4.107 5.146 7,626.24 3.966 0.948 7,627.30 4.110 5.228 7,626.26 3.968 1.027 7,627.32 4.113 5.310 7,626.28 3.971 1.107 7,627.34 4.115 5.392 7,626.30 3.974 1.186 7,627.36 4.118 5.475 7,626.32 3.977 1.266 7,627.38 4.121 5.557 7,626.34 3.979 1.345 7,627.40 4.123 5.639 7,626.36 3.982 1.425 7,627.42 4.126 5.722 7,626.38 3.985 1.504 7,627.44 4.129 5.805 7,626.40 3.987 1.584 7,627.46 4.132 5.887 7,626.42 3.990 1.664 7,627.48 4.134 5.970 7,626.44 3.993 1.744 7,627.50 4.137 6.053 7,626.46 3.996 1.824 7,627.52 4.140 6.135 7,626.48 3.998 1.904 7,627.54 4.142 6.218 7,626.50 4.001 1.984 7,627.56 4.145 6.301 7,626.52 4.004 2.064 7,627.58 4.148 6.384 7,626.54 4.006 2.144 7,627.60 4.151 6.467 7,626.56 4.009 2.224 7,627.62 4.153 6.550 7,626.58 4.012 2.304 7,627.64 4.156 6.633 7,626.60 4.015 2.384 7,627.66 4.159 6.716 7,626.62 4.017 2.465 7,627.68 4.161 6.799 7,626.64 4.020 2.545 7,627.70 4.164 6.883 7,626.66 4.023 2.625 7,627.72 4.167 6.966 7,626.68 4.025 2.706 7,627.74 4.170 7.049 7,626.70 4.028 2.786 7,627.76 4.172 7.133 7,626.72 4.031 2.867 7,627.78 4.175 7.216 7,626.74 4.034 2.948 7,627.80 4.178 7.300 7,626.76 4.036 3.028 7,627.82 4.181 7.383 7,626.78 4.039 3.109 7,627.84 4.183 7.467 7,626.80 4.042 3.190 7,627.86 4.186 7.551 7,626.82 4.045 3.271 7,627.88 4.189 7.634 7,626.84 4.047 3.352 7,627.90 4.191 7.718 7,626.86 4.050 3.433 7,627.92 4.194 7.802 7,626.88 4.053 3.514 7,627.94 4.197 7.886 7,626.90 4.055 3.595 7,627.96 4.200 7.970 7,626.92 4.058 3.676 7,627.98 4.202 8.054 7,626.94 4.061 3.757 7,628.00 4.205 8.138 7,626.96 4.064 3.838 7,626.98 4.066 3.920 7,627.00 4.069 4.001 7,627.02 4.072 4.082 7,627.04 4.074 4.164 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 170 160= Post -Development Type Il 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 21 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Link 72L: A -outfall Inflow Area = 1,623.872 ac, Inflow Depth > 0.39" for 100 Year event Inflow = 159.92 cfs @ 12.79 hrs, Volume= 53.299 af Primary = 159.92 cfs @ 12.79 hrs, Volume= 53.299 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 72L: A -outfall Hydrograph 150= 140. 159.92 cfs Inflow Area=1,623.872 ac 130- 120- 110- w 100. U ' • 90- 8 • 80- 70 60- 50 40- 30= 20- 10- 0 0 1 2 3 4 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Inflow — Primary Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 22 3/6/2007 Time (hours) 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 Inflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.20 44.27 122.41 159.30 144.85 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Hydrograph for Link 72L: A -outfall Primary (cfs) (hours) 0.00 13.25 0.00 13.50 0.00 13.75 0.00 14.00 0.00 14.25 0.00 14.50 0.00 14.75 0.00 15.00 0.00 15.25 0.00 15.50 0.00 15.75 0.00 16.00 0.00 16.25 0.00 16.50 0.00 16.75 0.00 17.00 0.00 17.25 0.00 17.50 0.00 17.75 0.00 18.00 0.00 18.25 0.00 18.50 0.00 18.75 0.00 19.00 0.00 19.25 0.00 19.50 0.00 19.75 0.00 20.00 0.00 20.25 0.00 20.50 0.00 20.75 0.00 21.00 0.00 21.25 0.00 21.50 0.00 21.75 0.00 22.00 0.00 22.25 0.00 22.50 0.00 22.75 0.00 23.00 0.00 23.25 0.00 23.50 0.00 23.75 0.00 24.00 0.00 0.00 0.00 0.00 3.20 44.27 122.41 159.30 144.85 Time Inflow (cfs) 121.14 104.63 93.08 84.72 78.44 73.47 69.67 66.76 64.42 62.56 60.83 59.13 57.40 55.72 54.22 52.97 51.93 50.98 50.09 49.22 48.36 47.51 46.65 45.79 44.93 44.05 43.17 42.28 36.46 29.15 26.23 24.82 24.04 23.56 23.24 23.00 22.81 22.63 22.47 22.31 22.15 21.99 21.83 21.67 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 121.14 104.63 93.08 84.72 78.44 73.47 69.67 66.76 64.42 62.56 60.83 59.13 57.40 55.72 54.22 52.97 51.93 50.98 50.09 49.22 48.36 47.51 46.65 45.79 44.93 44.05 43.17 42.28 36.46 29.15 26.23 24.82 24.04 23.56 23.24 23.00 22.81 22.63 22.47 22.31 22.15 21.99 21.83 21.67 / \ [Subcat [Reach 2S Area B PRE Drainage Diagram for Pre -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Pre -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 77.760 56 Brush, Fair, HSG B (2S) 10.750 58 Meadow, non -grazed, HSG B (2S) 75.060 70 Brush, Fair, HSG C (2S) 2.870 71 Meadow, non -grazed, HSG C (2S) 1.190 73 Woods, Fair, HSG C (2S) 167.630 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Type 11 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=5.00-24.00 hrs, dt=0.05 hrs, 381 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 2S: Area B Runoff Area=167.630 ac Runoff Depth>0.31" Flow Length=6,346' Tc=37.7 min CN=63 Runoff=21.95 cfs 4.307 af Total Runoff Area = 167.630 ac Runoff Volume = 4.307 af Average Runoff Depth = 0.31" 100.00% Pervious Area = 167.630 ac 0.00% Impervious Area = 0.000 ac Pre -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 YEAR Rainfall=2.70" Page 4 3/6/2007 Runoff = Subcatchment 2S: Area B 21.95 cfs @ 12.47 hrs, Volume= 4.307 af, Depth> 0.31" Runoff by SCS TR -20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type I124 -hr 100 YEAR Rainfall=2.70" Area (ac) CN Description 77.760 56 75.060 70 10.750 58 2.870 71 1.190 73 Brush, Fair, HSG B Brush, Fair, HSG C Meadow, non -grazed, HSG B Meadow, non -grazed, HSG C Woods, Fair, HSG C 167.630 63 167.630 Tc Length (min) (feet) Weighted Average Pervious Area Slope (ft/ft) Velocity Capacity (ft/sec) (cfs) Description 24.5 100 0.0445 0.07 Sheet Flow, Woods: Light underbrush n= 0.400 5.2 2,389 0.2244 7.63 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 8.0 3,857 0.1218 8.02 9.62 Channel Flow, Area= 1.2 sf Perim= 3.8' r= 0.32' P2= 1.30" n= 0.030 37.7 6,346 Total Subcatchment 2S: Area B Hydrograph 24- 23- 22- 21- 20 19` 18- 17 16- 15- 14-e 13= 12 1110 9. 7' 6- 5 3- 2- 21.95 -2 21.95 cfs 1 Type II 24 -hr 100 YEAR Rainfall=2.70" Runoff Area=167.630 ac Runoff Volume=4.307 af Runoff Depth>0.31" Flow Length=6,346' Tc=37.7 m i n CN=63 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 2 Time (hours) — Runoff Pre -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 YEAR Rainfall=2.70" Page 5 3/6/2007 Time (hours) 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 Precip. (inches) 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 2.12 2.16 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2.43 2.45 2.46 2.47 2.49 Excess (inches) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.06 0.08 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.16 0.17 0.18 0.18 0.19 0.19 0.20 0.20 0.21 0.21 0.22 0.22 0.23 0.23 0.24 0.24 Hydrograph for Subcatchment 2S: Area B Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.98 14.89 21.78 16.25 11.95 9.37 7.83 6.82 6.04 5.44 4.98 4.68 4.48 4.30 4.12 3.93 3.74 3.54 3.37 3.25 3.17 3.10 3.03 2.97 2.90 Time (hours) 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess (inches) 0.24 0.25 0.25 0.25 0.26 0.26 0.26 0.27 0.27 0.27 0.28 0.28 0.28 0.29 0.29 0.29 0.29 0.30 0.30 0.30 0.31 0.31 0.31 0.31 Runoff (cfs) 2.82 2.75 2.67 2.60 2.51 2.43 2.35 2.26 2.18 2.11 2.07 2.05 2.03 2.02 2.01 2.00 1.98 1.97 1.96 1.95 1.93 1.92 1.90 1.89 22S 3S) B -Bypass\ P d -B Subcat 1Reach' Pon 23L B -outfall Drainage Diagram for Post -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Post -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 77.840 56 Brush, Fair, HSG B (3S,22S) 8.210 58 Meadow, non -grazed, HSG B (3S) 0.460 61 >75% Grass cover, Good, HSG B (3S) 71.630 70 Brush, Fair, HSG C (3S,22S) 2.880 71 Meadow, non -grazed, HSG C (3S) 1.230 73 Woods, Fair, HSG C (3S) 6.890 98 Paved roads w/curbs & sewers (3S) 169.140 Post -Development Type 1124 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 3S: Area -B Subcatchment 22S: B -Bypass Pond 5P: Pond -B Link 23L: B -outfall Runoff Area=168.640 ac Runoff Depth>0.34" Flow Length=6,614' Tc=31.0 min CN=64 Runoff=29.41 cfs 4.767 af Runoff Area=0.500 ac Runoff Depth>0.21" Tc=5.0 min CN=59 Runoff=0.09 cfs 0.009 af Peak Elev=7,674.94' Storage=0.458 af Inflow=29.41 cfs 4.767 af Outflow=21.07 cfs 4.690 af Inflow=21.09 cfs 4.699 af Primary=21.09 cfs 4.699 af Total Runoff Area = 169.140 ac Runoff Volume = 4.776 af Average Runoff Depth = 0.34" 95.93% Pervious Area = 162.250 ac 4.07% Impervious Area = 6.890 ac 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 4 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 3S: Area -B Runoff = 29.41 cfs @ 12.35 hrs, Volume= 4.767 af, Depth> 0.34" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 Year Rainfall=2.70" Area (ac) 77.430 71.540 8.210 2.880 1.230 6.890 0.460 168.640 161.750 6.890 CN 56 70 58 71 73 98 61 64 Tc Length (min) (feet) Description Brush, Fair, HSG B Brush, Fair, HSG C Meadow, non -grazed, HSG B Meadow, non -grazed, HSG C Woods, Fair, HSG C Paved roads w/curbs & sewers >75% Grass cover, Good, HSG B Weighted Average Pervious Area Impervious Area Slope Velocity (ft/ft) (ft/sec) Capacity Description (cfs) 16.3 100 5.2 2,389 0.0445 0.10 0.2244 7.63 5.0 2,566 0.1405 2.5 892 0.0759 2.0 667 0.0395 Sheet Flow, Grass: Dense n= 0.240 P2= 1.30" Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 8.61 10.33 Channel Flow, Area= 1.2 sf Perim= 3.8' r= 0.32' n= 0.030 Earth, grassed & winding 5.99 9.59 Channel Flow, Area= 1.6 sf Perim= 5.5' r= 0.29' n= 0.030 5.64 146.57 Channel Flow, Area= 26.0 sf Perim= 60.0' r= 0.43' n= 0.030 31.0 6,614 Total Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 5 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 32 30 28 26 24 22 20- • 18- • 16= c u - 14: 12 10 a 6 4 2 Subcatchment 3S: Area -B Hydrograph 29.41 cfsl Type II 24 -hr 100 Year Rainfall=2.70" Runoff Area=168.640 ac Runoff Volume=4.767 of Runoff Depth>0.34" Flow Length=6,614' Tc=31.0 min CN=64 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 6 3/6/2007 Time (hours) 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 Precip. (inches) 0.00 0.01 0.01 0.02 0.03 0.04 0.04 0.05 0.06 0.07 0.08 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 Excess (inches) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.07 0.10 0.11 0.13 0.14 Hydrograph for Subcatchment 3S: Area -B Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.65 26.48 24.83 16.31 11.62 Time (hours) 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.12 2.16 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2.43 2.45 2.46 2.47 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess (inches) 0.15 0.16 0.17 0.18 0.18 0.19 0.20 0.20 0.21 0.22 0.22 0.23 0.23 0.24 0.24 0.25 0.25 0.26 0.26 0.27 0.27 0.27 0.28 0.28 0.29 0.29 0.29 0.30 0.30 0.30 0.31 0.31 0.31 0.31 0.32 0.32 0.32 0.33 0.33 0.33 0.34 0.34 0.34 0.34 Runoff (cfs) 9.26 7.87 6.91 6.21 5.61 5.19 4.93 4.73 4.54 4.34 4.14 3.92 3.70 3.54 3.44 3.36 3.29 3.21 3.14 3.06 2.98 2.90 2.82 2.73 2.64 2.55 2.46 2.37 2.28 2.22 2.19 2.17 2.15 2.14 2.13 2.11 2.10 2.09 2.07 2.06 2.04 2.03 2.01 2.00 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 7 3/6/2007 Subcatchment 22S: B -Bypass [49] Hint: Tc<2dt may require smaller dt Runoff = 0.09 cfs @ 12.01 hrs, Volume= 0.009 af, Depth> 0.21" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 Year Rainfall=2.70" Area (ac) 0.410 0.090 0.500 0.500 CN Description 56 Brush, Fair, HSG B 70 Brush, Fair, HSG C 59 Weighted Average Pervious Area Tc Length Slope Velocity (min) (feet) (ft/ft) (ft/sec) 5.0 0.1- 0.095- 0.09- 0.085 .10.095-0.090.085 0.08= 0.075 0.07= 0.065= 0.06 u 0.055 0.054 LL 0.045= 0.04- 0.035'_ 0.03- 0.0254 0.024 0.015= 0.01 0.005- 0 Capacity (cfs) Description Direct Entry, Subcatchment 22S: B -Bypass Hydrograph Type 1124 -hr 100 Year Rainfall=2.70" Runoff Area=0.500 ac Runoff Volume=0.009 af Runoff Depth>0.21" Tc=5.0 min CN=59 cfs 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 8 3/6/2007 Time (hours) 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 Precip. (inches) 0.00 0.01 0.01 0.02 0.03 0.04 0.04 0.05 0.06 0.07 0.08 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 Excess (inches) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.04 0.05 0.06 0.06 Hydrograph for Subcatchment 22S: B -Bypass Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.03 0.02 0.02 0.02 Time (hours) 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.12 2.16 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2.43 2.45 2.46 2.47 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess (inches) 0.07 0.08 0.08 0.09 0.09 0.10 0.10 0.11 0.11 0.11 0.12 0.12 0.13 0.13 0.13 0.14 0.14 0.14 0.15 0.15 0.15 0.16 0.16 0.16 0.16 0.17 0.17 0.17 0.17 0.18 0.18 0.18 0.18 0.19 0.19 0.19 0.19 0.19 0.20 0.20 0.20 0.20 0.21 0.21 Runoff (cfs) 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 9 3/6/2007 Inflow Area = Inflow = Outflow = Primary = Pond 5P: Pond -B 168.640 ac, Inflow Depth > 0.34" 29.41 cfs © 12.35 hrs, Volume= 21.07 cfs @ 12.59 hrs, Volume= 21.07 cfs @ 12.59 hrs, Volume= for 100 Year event 4.767 af 4.690 af, Atten= 28%, Lag= 14.6 min 4.690 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 7,674.94' @ 12.59 hrs Surf.Area= 0.190 ac Storage= 0.458 af Plug -Flow detention time= 18.8 min calculated for 4.690 af (98% of inflow) Center -of -Mass det. time= 10.7 min ( 945.1 - 934.4 ) Volume Invert Avail.Storage Storage Description #1 7,671.50' 0.673 af Custom Stage Data (Prismatic)Listed below (Recalc) Elevation (feet) 7,671.50 7,672.00 7,673.00 7,674.00 7,675.00 7,676.00 Device Surf.Area (acres) 0.000 0.078 0.147 0.168 0.191 0.216 Inc.Store Cum.Store (acre-feet) (acre-feet) 0.000 0.000 0.020 0.020 0.112 0.132 0.158 0.290 0.180 0.469 0.203 0.673 Routing Invert Outlet Devices #1 Primary 7,671.50' #2 Device 1 7,672.00' 30.0" x 52.0' long Culvert CMP, square edge headwall, Ke= 0.500 Outlet Invert= 7,666.00' S= 0.1058 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior 24.0" Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=21.05 cfs @ 12.59 hrs HW=7,674.94' (Free Discharge) t Culvert (Passes 21.05 cfs of 34.96 cfs potential flow) 2=Orifice/Grate (Orifice Controls 21.05 cfs @ 6.70 fps) — Primary Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 10 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 32 30 28 26 24 22 20 w 18 3 16- 0 LL Elevation (feet) 14- 12- 10 8= 6- 4 - Pond 5P: Pond -B Hydrograph P -6741 -ail Inflow Area=168.640 ac Peak EIev=7,674.94' Storage=0.458 of 21.07 cfs 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 7.676 7.675 7,674 7.673 Pond 5P: Pond -B Stage -Discharge 7.672 Orifice/Grate Culvert 2 4 6 8 10 12 14 16 18 20 22 24 26 Discharge (cfs) — Inflow II Primary Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 11 3/6/2007 Elevation (feet) Pond 5P: Pond -B Stage -Area -Storage Surface/Horizontal/Wetted Area (acres) 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 7,676- 7,675 7,674- 7.673- 7,672 0.16 0.18 0.2 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 Storage (acre-feet) — Surface — Storage Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 12 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Hydrograph for Pond 5P: Pond -B Time Inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet) (cfs) 0.00 0.00 0.000 7,671.50 0.00 0.50 0.00 0.000 7,671.50 0.00 1.00 0.00 0.000 7,671.50 0.00 1.50 0.00 0.000 7,671.50 0.00 2.00 0.00 0.000 7,671.50 0.00 2.50 0.00 0.000 7,671.50 0.00 3.00 0.00 0.000 7,671.50 0.00 3.50 0.00 0.000 7,671.50 0.00 4.00 0.00 0.000 7,671.50 0.00 4.50 0.00 0.000 7,671.50 0.00 5.00 0.00 0.000 7,671.50 0.00 5.50 0.00 0.000 7,671.50 0.00 6.00 0.00 0.000 7,671.50 0.00 6.50 0.00 0.000 7,671.50 0.00 7.00 0.00 0.000 7,671.50 0.00 7.50 0.00 0.000 7,671.50 0.00 8.00 0.00 0.000 7,671.50 0.00 8.50 0.00 0.000 7,671.50 0.00 9.00 0.00 0.000 7,671.50 0.00 9.50 0.00 0.000 7,671.50 0.00 10.00 0.00 0.000 7,671.50 0.00 10.50 0.00 0.000 7,671.50 0.00 11.00 0.00 0.000 7,671.50 0.00 11.50 0.00 0.000 7,671.50 0.00 12.00 2.65 0.010 7,671.85 0.00 12.50 24.83 0.443 7,674.86 20.65 13.00 11.62 0.327 7,674.22 16.72 13.50 7.87 0.191 7,673.39 9.38 14.00 6.21 0.154 7,673.15 6.78 14.50 5.19 0.135 7,673.02 5.53 15.00 4.73 0.125 7,672.95 4.90 15.50 4.34 0.119 7,672.91 4.49 16.00 3.92 0.112 7,672.86 4.08 16.50 3.54 0.106 7,672.81 3.67 17.00 3.36 0.102 7,672.78 3.43 17.50 3.21 0.099 7,672.76 3.27 18.00 3.06 0.097 7,672.74 3.12 18.50 2.90 0.094 7,672.72 2.96 19.00 2.73 0.091 7,672.70 2.80 19.50 2.55 0.088 7,672.68 2.63 20.00 2.37 0.085 7,672.65 2.45 20.50 2.22 0.082 7,672.63 2.28 21.00 2.17 0.080 7,672.61 2.19 21.50 2.14 0.080 7,672.61 2.15 22.00 2.11 0.079 7,672.61 2.13 22.50 2.09 0.079 7,672.60 2.10 23.00 2.06 0.078 7,672.60 2.07 23.50 2.03 0.078 7,672.59 2.04 24.00 2.00 0.077 7,672.59 2.01 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 13 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Elevation Primary (feet) (cfs) 7,671.50 0.00 7,671.55 0.00 I 7,671.60 0.00 7,671.65 0.00 7,671.70 0.00 7,671.75 0.00 I 7,671.80 0.00 7,671.85 0.00 7,671.90 0.00 7,671.95 0.00 I 7,672.00 0.00 7,672.05 0.02 7,672.10 0.06 I 7,672.15 0.14 7,672.20 0.25 7,672.25 0.39 7,672.30 0.55 I 7,672.35 0.74 7,672.40 0.96 7,672.45 1.21 7,672.50 1.48 I 7,672.55 1.77 7,672.60 2.09 7,672.65 2.43 I 7,672.70 2.79 7,672.75 3.17 7,672.80 3.57 7,672.85 3.99 I 7,672.90 4.43 7,672.95 4.88 7,673.00 5.35 7,673.05 5.83 I 7,673.10 6.32 7,673.15 6.83 7,673.20 7.34 7,673.25 7.86 I 7,673.30 8.39 7,673.35 8.93 7,673.40 9.46 I 7,673.45 10.00 7,673.50 10.54 7,673.55 11.07 7,673.60 11.60 I 7,673.65 12.12 7,673.70 12.63 7,673.75 13.13 7,673.80 13.60 I 7,673.85 14.05 7,673.90 14.47 7,673.95 14.84 7,674.00 15.13 I 7,674.05 15.50 7,674.10 15.87 1 Stage -Discharge for Pond 5P: Pond -B Elevation Primary (feet) (cfs) 7,674.15 7,674.20 7,674.25 7,674.30 7,674.35 7,674.40 7,674.45 7,674.50 7,674.55 7,674.60 7,674.65 7,674.70 7,674.75 7,674.80 7,674.85 7,674.90 7,674.95 7,675.00 7,675.05 7,675.10 7,675.15 7,675.20 7,675.25 7,675.30 7,675.35 7,675.40 7,675.45 7,675.50 7,675.55 7,675.60 7,675.65 7,675.70 7,675.75 7,675.80 7,675.85 7,675.90 7,675.95 7,676.00 16.22 16.57 16.91 17.25 17.58 17.90 18.21 18.53 18.83 19.13 19.43 19.72 20.01 20.29 20.57 20.85 21.12 21.39 21.66 21.92 22.18 22.44 22.69 22.94 23.19 23.43 23.68 23.92 24.16 24.39 24.62 24.86 25.08 25.31 25.54 25.76 25.98 26.20 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 14 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Stage -Area -Storage for Pond 5P: Pond -B Elevation Surface Storage Elevation Surface Storage (feet) (acres) (acre-feet) (feet) (acres) (acre-feet) 7,671.50 0.000 0.000 7,674.15 0.171 0.315 7,671.55 0.008 0.000 7,674.20 0.173 0.324 7,671.60 0.016 0.001 7,674.25 0.174 0.332 7,671.65 0.023 0.002 7,674.30 0.175 0.341 7,671.70 0.031 0.003 7,674.35 0.176 0.350 7,671.75 0.039 0.005 7,674.40 0.177 0.359 7,671.80 0.047 0.007 7,674.45 0.178 0.367 7,671.85 0.055 0.010 7,674.50 0.180 0.376 7,671.90 0.062 0.012 7,674.55 0.181 0.385 7,671.95 0.070 0.016 7,674.60 0.182 0.394 7,672.00 0.078 0.020 7,674.65 0.183 0.404 7,672.05 0.081 0.023 7,674.70 0.184 0.413 7,672.10 0.085 0.028 7,674.75 0.185 0.422 7,672.15 0.088 0.032 7,674.80 0.186 0.431 7,672.20 0.092 0.036 7,674.85 0.188 0.441 7,672.25 0.095 0.041 7,674.90 0.189 0.450 7,672.30 0.099 0.046 7,674.95 0.190 0.459 7,672.35 0.102 0.051 7,675.00 0.191 0.469 7,672.40 0.106 0.056 7,675.05 0.192 0.479 7,672.45 0.109 0.062 7,675.10 0.194 0.488 7,672.50 0.112 0.067 7,675.15 0.195 0.498 7,672.55 0.116 0.073 7,675.20 0.196 0.508 7,672.60 0.119 0.079 7,675.25 0.197 0.518 7,672.65 0.123 0.085 7,675.30 0.199 0.527 7,672.70 0.126 0.091 7,675.35 0.200 0.537 7,672.75 0.130 0.097 7,675.40 0.201 0.547 7,672.80 0.133 0.104 7,675.45 0.202 0.557 7,672.85 0.137 0.111 7,675.50 0.203 0.568 7,672.90 0.140 0.118 7,675.55 0.205 0.578 7,672.95 0.144 0.125 7,675.60 0.206 0.588 7,673.00 0.147 0.132 7,675.65 0.207 0.598 7,673.05 0.148 0.139 7,675.70 0.208 0.609 7,673.10 0.149 0.147 7,675.75 0.210 0.619 7,673.15 0.150 0.154 7,675.80 0.211 0.630 7,673.20 0.151 0.162 7,675.85 0.212 0.640 7,673.25 0.152 0.169 7,675.90 0.213 0.651 7,673.30 0.153 0.177 7,675.95 0.215 0.662 7,673.35 0.154 0.185 7,676.00 0.216 0.673 7,673.40 0.155 0.192 7,673.45 0.156 0.200 7,673.50 0.158 0.208 7,673.55 0.159 0.216 7,673.60 0.160 0.224 7,673.65 0.161 0.232 7,673.70 0.162 0.240 7,673.75 0.163 0.248 7,673.80 0.164 0.256 7,673.85 0.165 0.265 7,673.90 0.166 0.273 7,673.95 0.167 0.281 7,674.00 0.168 0.290 7,674.05 0.169 0.298 7,674.10 0.170 0.306 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 15 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Link 23L: B -outfall Inflow Area = 169.140 ac, Inflow Depth > 0.33" for 100 Year event Inflow = 21.09 cfs @ 12.59 hrs, Volume= 4.699 af Primary = 21.09 cfs @ 12.59 hrs, Volume= 4.699 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs 0 LL Link 23L: B -outfall Hydrograph 23- 22 21- 20- 19 18` 17_ 16 15 14- 13 12- 11 10- 9 8-'. 7. 5- 3 2= Inflow Area=169.140 ac 21.09 cfs 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 16 19 Zu L1 ZZ LS L Time (hours) — Inflow II — Primary Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 16 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time (hours) 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 Inflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 11.76 20.67 20.23 16.74 Hydrograph for Link 23L: B -outfall Elevation Primary (feet) (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time (hours) 13.25 13.50 0.00 13.75 0.00 14.00 0.00 14.25 0.00 14.50 0.00 14.75 0.00 15.00 0.00 15.25 0.00 15.50 0.00 15.75 0.00 16.00 0.00 16.25 0.00 16.50 0.00 16.75 0.00 17.00 0.00 17.25 0.00 17.50 0.00 17.75 0.00 18.00 0.00 18.25 0.00 18.50 0.00 18.75 0.00 19.00 0.00 19.25 0.00 19.50 0.00 19.75 0.00 20.00 0.00 20.25 0.00 20.50 0.00 20.75 0.00 21.00 0.00 21.25 0.00 21.50 0.00 21.75 0.00 22.00 0.00 22.25 0.00 22.50 0.00 22.75 0.00 23.00 0.00 23.25 0.00 23.50 0.00 23.75 0.00 24.00 0.00 0.00 0.00 0.00 0.09 11.76 20.67 20.23 16.74 Inflow (cfs) 12.53 9.40 7.77 6.79 6.08 5.54 5.16 4.91 4.70 4.50 4.30 4.09 3.88 3.68 3.54 3.44 3.35 3.28 3.20 3.13 3.05 2.97 2.89 2.81 2.72 2.63 2.54 2.45 2.36 2.28 2.23 2.19 2.17 2.16 2.14 2.13 2.12 2.10 2.09 2.08 2.06 2.05 2.03 2.02 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 12.53 9.40 7.77 6.79 6.08 5.54 5.16 4.91 4.70 4.50 4.30 4.09 3.88 3.68 3.54 3.44 3.35 3.28 3.20 3.13 3.05 2.97 2.89 2.81 2.72 2.63 2.54 2.45 2.36 2.28 2.23 2.19 2.17 2.16 2.14 2.13 2.12 2.10 2.09 2.08 2.06 2.05 2.03 2.02 3S Area C PRE Subcat Reach'I Pon Drainage Diagram for Pre -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroCAD® 8.00 s/n 004370 2006 HydroCAD Software Solutions LLC Pre -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 11.610 56 Brush, Fair, HSG B (3S) 49.680 70 Brush, Fair, HSG C (3S) 3.970 71 Meadow, non -grazed, HSG C (3S) 65.260 Pre -Development Type 11 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=5.00-24.00 hrs, dt=0.05 hrs, 381 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 3S: Area C Runoff Area=65.260 ac Runoff Depth>0.47" Flow Length=3,560' Tc=22.7 min CN=68 Runoff=24.31 cfs 2.577 af Total Runoff Area = 65.260 ac Runoff Volume = 2.577 af Average Runoff Depth = 0.47" 100.00% Pervious Area = 65.260 ac 0.00% Impervious Area = 0.000 ac 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pre -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 YEAR Rainfall=2.70" Page 4 3/6/2007 Subcatchment 3S: Area C Runoff = 24.31 cfs @ 12.20 hrs, Volume= 2.577 af, Depth> 0.47" Runoff by SCS TR -20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type 1124 -hr 100 YEAR Rainfall=2.70" Area (ac) CN Description 11.610 56 49.680 70 3.970 71 Brush, Fair, HSG B Brush, Fair, HSG C Meadow, non -grazed, HSG C 65.260 68 65.260 Tc Length (min) (feet) 13.5 100 5.8 2,558 3.4 902 Weighted Average Pervious Area Slope (ft/ft) Velocity Capacity (ft/sec) (cfs) Description 0 0 0 .1986 0.12 .2097 7.37 .0726 4.37 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 1.31 Channel Flow, Area= 0.3 sf Perim= 1.6' r= 0.19' n= 0.030 22.7 3,560 Total Subcatchment 3S: Area C Hydrograph 26 25 24-- 23= 22 21 20- 19 18- 17- 16- 15- 14- 137- 112 817=16151413=11. 10- 8; 7. 6= 5 4; 3; 22 0' I24.31cis I Type II 24 -hr 100 YEAR Rainfall=2.70" Runoff Area=65.260 ac Runoff Volume=2.577 af Runoff Depth>0.47" Flow Length=3,560' Tc=22.7 m i n CN=68 5 — Runoff 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 YEAR Rainfall=2.70" Page 5 3/6/2007 Hydrograph for Subcatchment 3S: Area C Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.17 0.00 0.00 5.25 0.18 0.00 0.00 5.50 0.19 0.00 0.00 5.75 0.20 0.00 0.00 6.00 0.22 0.00 0.00 6.25 0.23 0.00 0.00 6.50 0.24 0.00 0.00 6.75 0.25 0.00 0.00 7.00 0.27 0.00 0.00 7.25 0.28 0.00 0.00 7.50 0.29 0.00 0.00 7.75 0.31 0.00 0.00 8.00 0.32 0.00 0.00 8.25 0.34 0.00 0.00 8.50 0.36 0.00 0.00 8.75 0.38 0.00 0.00 9.00 0.40 0.00 0.00 9.25 0.42 0.00 0.00 9.50 0.44 0.00 0.00 9.75 0.46 0.00 0.00 10.00 0.49 0.00 0.00 10.25 0.52 0.00 0.00 10.50 0.55 0.00 0.00 10.75 0.59 0.00 0.00 11.00 0.63 0.00 0.00 11.25 0.69 0.00 0.00 11.50 0.76 0.00 0.00 11.75 1.04 0.00 0.00 12.00 1.79 0.13 7.38 12.25 1.91 0.16 23.28 12.50 1.98 0.19 11.70 12.75 2.04 0.21 6.99 13.00 2.08 0.22 5.08 13.25 2.12 0.24 4.16 13.50 2.16 0.25 3.64 13.75 2.19 0.26 3.25 14.00 2.21 0.27 2.92 14.25 2.24 0.28 2.64 14.50 2.26 0.29 2.47 14.75 2.28 0.30 2.36 15.00 2.30 0.31 2.26 15.25 2.32 0.31 2.17 15.50 2.34 0.32 2.06 15.75 2.36 0.33 1.96 16.00 2.38 0.34 1.85 16.25 2.39 0.34 1.74 16.50 2.41 0.35 1.67 16.75 2.42 0.35 1.63 17.00 2.43 0.36 1.60 17.25 2.45 0.37 1.56 17.50 2.46 0.37 1.52 17.75 2.47 0.38 1.48 18.00 2.49 0.38 1.44 Time (hours) 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess (inches) 0.39 0.39 0.40 0.40 0.41 0.41 0.41 0.42 0.42 0.43 0.43 0.43 0.44 0.44 0.45 0.45 0.45 0.46 0.46 0.46 0.47 0.47 0.48 0.48 Runoff (cfs) 1.40 1.36 1.32 1.28 1.23 1.19 1.14 1.10 1.06 1.04 1.03 1.02 1.01 1.00 1.00 0.99 0.98 0.98 0.97 0.96 0.95 0.95 0.94 0.93 \ Subcat Reach 1S /\\\ S 6P C -outfall Drainage Diagram for Post -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroCADO 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Post -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 13.190 56 Brush, Fair, HSG B (1S,24S) 46.012 70 Brush, Fair, HSG C (1S,24S) 3.083 71 Meadow, non -grazed, HSG C (1S) 0.275 74 >75% Grass cover, Good, HSG C (1S) 0.110 98 Paved parking & roofs (24S) 4.988 98 Paved roads w/curbs & sewers (1S) 67.658 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Area -C Runoff Area=58.461 ac Runoff Depth>0.59" Flow Length=3,822' Tc=23.7 min CN=71 Runoff=29.08 cfs 2.868 af Subcatchment 24S: C -Bypass Runoff Area=9.197 ac Runoff Depth>0.31" Tc=5.0 min CN=63 Runoff=3.76 cfs 0.241 af Pond 6P: Pond -C Peak Elev=7,812.82' Storage=0.364 af Inflow=29.08 cfs 2.868 af Outflow=21.03 cfs 2.848 af Link 25L: C -outfall Inflow=21.75 cfs 3.088 af Primary=21.75 cfs 3.088 af Total Runoff Area = 67.658 ac Runoff Volume = 3.109 af Average Runoff Depth = 0.55" 92.47% Pervious Area = 62.560 ac 7.53% Impervious Area = 5.098 ac Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 4 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 1S: Area -C Runoff = 29.08 cfs @ 12.20 hrs, Volume= 2.868 af, Depth> 0.59" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 8.058 56 Brush, Fair, HSG B 42.057 70 Brush, Fair, HSG C 3.083 71 Meadow, non -grazed, HSG C 4.988 98 Paved roads w/curbs & sewers 0.275 74 >75% Grass cover, Good, HSG C 58.461 71 Weighted Average 53.473 Pervious Area 4.988 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 100 0.1986 0.12 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 5.0 2,231 0.2145 7.46 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 4.0 1,108 0.0705 4.57 4.11 Channel Flow, Area= 0.9 sf Perim= 4.4' r= 0.20' n= 0.030 1.2 383 0.1179 5.53 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 23.7 3,822 Total 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 11 11 11 11 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 5 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 1S: Area -C Hydrograph 32- 30. 28= 26- 24= 22- 20- U 16= 0 a 14i 12 10; 8- 6 4= 2-. 0 29.08 cfs 1 Type II 24 -hr 100 Year Rainfall=2.70" Runoff Area=58.461 ac Runoff Volume=2.868 of Runoff Depth>0.59" Flow Length=3,822' Tc=23.7 m i n CN=71 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 6 3/6/2007 Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.25 0.01 0.00 0.50 0.01 0.00 0.75 0.02 0.00 1.00 0.03 0.00 1.25 0.04 0.00 1.50 0.04 0.00 1.75 0.05 0.00 2.00 0.06 0.00 2.25 0.07 0.00 2.50 0.08 0.00 2.75 0.08 0.00 3.00 0.09 0.00 3.25 0.10 0.00 3.50 0.11 0.00 3.75 0.12 0.00 4.00 0.13 0.00 4.25 0.14 0.00 4.50 0.15 0.00 4.75 0.16 0.00 5.00 0.17 0.00 5.25 0.18 0.00 5.50 0.19 0.00 5.75 0.20 0.00 6.00 0.22 0.00 6.25 0.23 0.00 6.50 0.24 0.00 6.75 0.25 0.00 7.00 0.27 0.00 7.25 0.28 0.00 7.50 0.29 0.00 7.75 0.31 0.00 8.00 0.32 0.00 8.25 0.34 0.00 8.50 0.36 0.00 8.75 0.38 0.00 9.00 0.40 0.00 9.25 0.42 0.00 9.50 0.44 0.00 9.75 0.46 0.00 10.00 0.49 0.00 10.25 0.52 0.00 10.50 0.55 0.00 10.75 0.59 0.00 11.00 0.63 0.00 11.25 0.69 0.00 11.50 0.76 0.00 11.75 1.04 0.01 12.00 1.79 0.19 12.25 1.91 0.23 12.50 1.98 0.26 12.75 2.04 0.28 13.00 2.08 0.30 Hydrograph for Subcatchment 1S: Area -C Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.12 10.36 27.99 13.85 7.95 5.59 Time Precip. Excess (hours) (inches) (inches) 13.25 2.12 0.32 13.50 2.16 0.33 13.75 2.19 0.34 14.00 2.21 0.36 14.25 2.24 0.37 14.50 2.26 0.38 14.75 2.28 0.39 15.00 2.30 0.40 15.25 2.32 0.41 15.50 2.34 0.41 15.75 2.36 0.42 16.00 2.38 0.43 16.25 2.39 0.44 16.50 2.41 0.45 16.75 2.42 0.45 17.00 2.43 0.46 17.25 2.45 0.47 17.50 2.46 0.47 17.75 2.47 0.48 18.00 2.49 0.48 18.25 2.50 0.49 18.50 2.51 0.50 18.75 2.52 0.50 19.00 2.53 0.51 19.25 2.54 0.51 19.50 2.55 0.52 19.75 2.56 0.52 20.00 2.57 0.53 20.25 2.58 0.53 20.50 2.59 0.54 20.75 2.60 0.54 21.00 2.60 0.54 21.25 2.61 0.55 21.50 2.62 0.55 21.75 2.63 0.56 22.00 2.64 0.56 22.25 2.65 0.57 22.50 2.65 0.57 22.75 2.66 0.57 23.00 2.67 0.58 23.25 2.68 0.58 23.50 2.68 0.59 23.75 2.69 0.59 24.00 2.70 0.59 Runoff (cfs) 4.49 3.89 3.45 3.09 2.78 2.59 2.47 2.37 2.26 2.15 2.04 1.92 1.80 1.73 1.69 1.65 1.61 1.57 1.53 1.48 1.44 1.40 1.35 1.31 1.26 1.22 1.17 1.13 1.08 1.06 1.05 1.04 1.03 1.02 1.02 1.01 1.00 0.99 0.98 0.98 0.97 0.96 0.95 0.94 F 11 1 1 1 1 11 n 11 1 M I I I I I I I I 11 111 I I 11 I I u b 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 7 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 24S: C -Bypass [49] Hint: Tc<2dt may require smaller dt Runoff = 3.76 cfs @ 11.99 hrs, Volume= 0.241 af, Depth> 0.31" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 5.132 56 Brush, Fair, HSG B 3.955 70 Brush, Fair, HSG C 0.110 98 Paved parking & roofs 9.197 63 Weighted Average 9.087 Pervious Area 0.110 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, 0 Subcatchment 24S: C -Bypass Hydrograph 3.76 cfs Type 1124 -hr 100 Year Rainfall=2.70" Runoff Area=9.197 ac Runoff Volume=0.241 af Runoff Depth>0.31" Tc=5.0 m i n CN=63 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 8 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time (hours) 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 Precip. (inches) 0.00 0.01 0.01 0.02 0.03 0.04 0.04 0.05 0.06 0.07 0.08 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 Excess (inches) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.06 0.08 0.10 0.11 0.12 Hydrograph for Subcatchment 24S: C -Bypass Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.74 0.82 0.58 0.46 0.40 Time (hours) 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.12 2.16 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2.43 2.45 2.46 2.47 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess (inches) 0.13 0.14 0.15 0.16 0.16 0.17 0.18 0.18 0.19 0.19 0.20 0.20 0.21 0.21 0.22 0.22 0.23 0.23 0.24 0.24 0.24 0.25 0.25 0.25 0.26 0.26 0.26 0.27 0.27 0.27 0.28 0.28 0.28 0.29 0.29 0.29 0.29 0.30 0.30 0.30 0.31 0.31 0.31 0.31 Runoff (cfs) 0.36 0.32 0.30 0.27 0.25 0.24 0.24 0.23 0.22 0.21 0.19 0.18 0.18 0.17 0.17 0.17 0.16 0.16 0.15 0.15 0.15 0.14 0.14 0.13 0.13 0.12 0.12 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.10 0.10 0.10 0.10 11 11 11 11 1 1 1 11 11 11 11 11 11 11 11 11 11 11 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 9 3/6/2007 Inflow Area = Inflow = Outflow = Primary = Pond 6P: Pond -C 58.461 ac, Inflow Depth > 0.59" 29.08 cfs @ 12.20 hrs, Volume= 21.03 cfs @ 12.36 hrs, Volume= 21.03 cfs @ 12.36 hrs, Volume= for 100 Year event 2.868 af 2.848 af, Atten= 28%, Lag= 9.5 min 2.848 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 7,812.82' @ 12.36 hrs Surf.Area= 0.301 ac Storage= 0.364 af Plug -Flow detention time= 14.5 min calculated for 2.842 af (99% of inflow) Center -of -Mass det. time= 10.6 min ( 904.6 - 894.0 ) Volume Invert Avail.Storage Storage Description #1 7,811.00' 0.749 af Custom Stage Data (Prismatic)Listed below (Recalc) Elevation (feet) 7,811.00 7,812.00 7,813.00 7,814.00 Surf.Area (acres) 0.000 0.264 0.309 0.351 Inc.Store Cum.Store (acre-feet) (acre-feet) 0.000 0.000 0.132 0.132 0.286 0.419 0.330 0.749 Device Routing Invert Outlet Devices #1 Primary 7,811.00' 24.0" x 44.0' long Culvert CPP, square edge headwall, Ke= 0.500 Outlet Invert= 7,805.96' S= 0.1145 '/' Cc= 0.900 n= 0.013 #2 Primary 7,811.50' 20.0" Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=20.95 cfs @ 12.36 hrs HW=7,812.81' (Free Discharge) 4L1=Culvert (Inlet Controls 13.74 cfs @ 4.59 fps) 2=Orifice/Grate (Orifice Controls 7.21 cfs @ 3.90 fps) — Inflow II — Primary Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 10 3/6/2007 Pond 6P: Pond -C Hydrograph 32= 30� 28= 26t. 24= 22 20= H 18- m c 0 a) w 6= 4; 2. 0- 0 129.08 cfs I Inflow Area=58.461 ac Peak Elev=7,812.82' Storage=0.364 of 121.03 cfs I 7,814 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pond 6P: Pond -C Stage -Discharge 7,813- 7,812- 7,811-, 0 5 10 15 20 25 30 Discharge (cfs) — Primary 11 IF 1 11 11 1 1 1 11 11 n 11 11 u -- Surface - Storage 11 li 11 11 1 1 1 1 11 11 11 11 1 11 1 1 11 11 11 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 11 3/6/2007 Elevation (feet) Pond 6P: Pond -C Stage -Area -Storage Surface/HorizontaWVetted Area (acres) 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 0.22 0.24 0.26 0.28 0.3 0.32 0.34 7,814' " ' ' " '' 7,813 7,812 7,811 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 Storage (acre-feet) Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 12 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Hydrograph for Pond 6P: Pond -C Time Inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet) (cfs) 0.00 0.00 0.000 7,811.00 0.00 0.50 0.00 0.000 7,811.00 0.00 1.00 0.00 0.000 7,811.00 0.00 1.50 0.00 0.000 7,811.00 0.00 2.00 0.00 0.000 7,811.00 0.00 2.50 0.00 0.000 7,811.00 0.00 3.00 0.00 0.000 7,811.00 0.00 3.50 0.00 0.000 7,811.00 0.00 4.00 0.00 0.000 7,811.00 0.00 4.50 0.00 0.000 7,811.00 0.00 5.00 0.00 0.000 7,811.00 0.00 5.50 0.00 0.000 7,811.00 0.00 6.00 0.00 0.000 7,811.00 0.00 6.50 0.00 0.000 7,811.00 0.00 7.00 0.00 0.000 7,811.00 0.00 7.50 0.00 0.000 7,811.00 0.00 8.00 0.00 0.000 7,811.00 0.00 8.50 0.00 0.000 7,811.00 0.00 9.00 0.00 0.000 7,811.00 0.00 9.50 0.00 0.000 7,811.00 0.00 10.00 0.00 0.000 7,811.00 0.00 10.50 0.00 0.000 7,811.00 0.00 11.00 0.00 0.000 7,811.00 0.00 11.50 0.00 0.000 7,811.00 0.00 12.00 10.36 0.050 7,811.62 2.28 12.50 13.85 0.327 7,812.70 18.85 13.00 5.59 0.156 7,812.09 8.02 13.50 3.89 0.096 7,811.85 4.68 14.00 3.09 0.073 7,811.75 3.48 14.50 2.59 0.061 7,811.68 2.81 15.00 2.37 0.054 7,811.64 2.48 15.50 2.15 0.050 7,811.61 2.26 16.00 1.92 0.045 7,811.58 2.03 16.50 1.73 0.041 7,811.55 1.82 17.00 1.65 0.038 7,811.54 1.70 17.50 1.57 0.036 7,811.52 1.61 18.00 1.48 0.034 7,811.51 1.53 18.50 1.40 0.032 7,811.49 1.45 19.00 1.31 0.030 7,811.48 1.36 19.50 1.22 0.028 7,811.46 1.27 20.00 1.13 0.026 7,811.44 1.18 20.50 1.06 0.024 7,811.43 1.09 21.00 1.04 0.023 7,811.42 1.05 21.50 1.02 0.023 7,811.41 1.03 22.00 1.01 0.022 7,811.41 1.02 22.50 0.99 0.022 7,811.41 1.00 23.00 0.98 0.022 7,811.40 0.98 23.50 0.96 0.021 7,811.40 0.97 24.00 0.94 0.021 7,811.40 0.95 u N 11 1 1 ll 1 1 11 1 1 1 11 11 11 11 11 11 11 11 11 11 n Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 13 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Elevation Primary (feet) (cfs) 7,811.00 0.00 7,811.02 0.00 7,811.04 0.01 7,811.06 0.02 7,811.08 0.04 7,811.10 0.06 7,811.12 0.09 7,811.14 0.12 7,811.16 0.16 7,811.18 0.20 7,811.20 0.25 7,811.22 0.30 7,811.24 0.36 7,811.26 0.42 7,811.28 0.48 7,811.30 0.55 7,811.32 0.62 7,811.34 0.70 7,811.36 0.79 7,811.38 0.87 7,811.40 0.96 7,811.42 1.06 7,811.44 1.16 7,811.46 1.26 7,811.48 1.37 7,811.50 1.48 7,811.52 1.60 7,811.54 1.72 7,811.56 1.86 7,811.58 2.00 7,811.60 2.15 7,811.62 2.31 7,811.64 2.47 7,811.66 2.65 7,811.68 2.83 7,811.70 3.02 7,811.72 3.21 7,811.74 3.42 7,811.76 3.63 7,811.78 3.85 7,811.80 4.07 7,811.82 4.30 7,811.84 4.54 7,811.86 4.79 7,811.88 5.04 7,811.90 5.30 7,811.92 5.56 7,811.94 5.83 7,811.96 6.10 7,811.98 6.39 7,812.00 6.67 7,812.02 6.97 7,812.04 7.26 Stage -Discharge for Pond 6P: Pond -C Elevation Primary (feet) (cfs) 7,812.06 7.57 7,812.08 7.87 7,812.10 8.19 7,812.12 8.50 7,812.14 8.83 7,812.16 9.15 7,812.18 9.48 7,812.20 9.82 7,812.22 10.16 7,812.24 10.50 7,812.26 10.84 7,812.28 11.19 7,812.30 11.54 7,812.32 11.90 7,812.34 12.26 7,812.36 12.62 7,812.38 12.98 7,812.40 13.34 7,812.42 13.71 7,812.44 14.08 7,812.46 14.45 7,812.48 14.82 7,812.50 15.19 7,812.52 15.57 7,812.54 15.94 7,812.56 16.31 7,812.58 16.69 7,812.60 17.06 7,812.62 17.43 7,812.64 17.80 7,812.66 18.17 7,812.68 18.54 7,812.70 18.91 7,812.72 19.27 7,812.74 19.63 7,812.76 19.99 7,812.78 20.34 7,812.80 20.69 7,812.82 21.04 7,812.84 21.37 7,812.86 21.71 7,812.88 22.03 7,812.90 22.35 7,812.92 22.66 7,812.94 22.95 7,812.96 23.24 7,812.98 23.51 7,813.00 23.75 7,813.02 24.04 7,813.04 24.32 7,813.06 24.60 7,813.08 24.87 7,813.10 25.13 Elevation Primary (feet) (cfs) 7,813.12 7,813.14 7,813.16 7,813.18 7,813.20 7,813.22 7,813.24 7,813.26 7,813.28 7,813.30 7,813.32 7,813.34 7,813.36 7,813.38 7,813.40 7,813.42 7,813.44 7,813.46 7,813.48 7,813.50 7,813.52 7,813.54 7,813.56 7,813.58 7,813.60 7,813.62 7,813.64 7,813.66 7,813.68 7,813.70 7,813.72 7,813.74 7,813.76 7,813.78 7,813.80 7,813.82 7,813.84 7,813.86 7,813.88 7,813.90 7,813.92 7,813.94 7,813.96 7,813.98 7,814.00 25.39 25.63 25.86 26.10 26.35 26.60 26.85 27.09 27.33 27.58 27.81 28.05 28.28 28.52 28.75 28.98 29.20 29.43 29.65 29.87 30.09 30.31 30.53 30.74 30.96 31.17 31.38 31.59 31.80 32.00 32.21 32.41 32.61 32.82 33.02 33.22 33.41 33.61 33.80 34.00 34.19 34.38 34.58 34.76 34.95 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 14 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Stage -Area -Storage for Pond 6P: Pond -C Elevation Surface Storage (feet) (acres) (acre-feet) 7,811.00 0.000 0.000 7,811.05 0.013 0.000 7,811.10 0.026 0.001 7,811.15 0.040 0.003 7,811.20 0.053 0.005 7,811.25 0.066 0.008 7,811.30 0.079 0.012 7,811.35 0.092 0.016 7,811.40 0.106 0.021 7,811.45 0.119 0.027 7,811.50 0.132 0.033 7,811.55 0.145 0.040 7,811.60 0.158 0.048 7,811.65 0.172 0.056 7,811.70 0.185 0.065 7,811.75 0.198 0.074 7,811.80 0.211 0.084 7,811.85 0.224 0.095 7,811.90 0.238 0.107 7,811.95 0.251 0.119 7,812.00 0.264 0.132 7,812.05 0.266 0.145 7,812.10 0.269 0.159 7,812.15 0.271 0.172 7,812.20 0.273 0.186 7,812.25 0.275 0.199 7,812.30 0.278 0.213 7,812.35 0.280 0.227 7,812.40 0.282 0.241 7,812.45 0.284 0.255 7,812.50 0.286 0.270 7,812.55 0.289 0.284 7,812.60 0.291 0.299 7,812.65 0.293 0.313 7,812.70 0.295 0.328 7,812.75 0.298 0.343 7,812.80 0.300 0.358 7,812.85 0.302 0.373 7,812.90 0.304 0.388 7,812.95 0.307 0.403 7,813.00 0.309 0.419 7,813.05 0.311 0.434 7,813.10 0.313 0.450 7,813.15 0.315 0.465 7,813.20 0.317 0.481 7,813.25 0.320 0.497 7,813.30 0.322 0.513 7,813.35 0.324 0.529 7,813.40 0.326 0.545 7,813.45 0.328 0.562 7,813.50 0.330 0.578 7,813.55 0.332 0.595 7,813.60 0.334 0.611 Elevation Surface Storage (feet) (acres) (acre-feet) 7,813.65 0.336 0.628 7,813.70 0.338 0.645 7,813.75 0.341 0.662 7,813.80 0.343 0.679 7,813.85 0.345 0.696 7,813.90 0.347 0.714 7,813.95 0.349 0.731 7,814.00 0.351 0.749 I I 1 1 11 1 11 1 1 1 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 1 1 1 1 1 11 11 11 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 15 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Link 25L: C -outfall Inflow Area = 67.658 ac, Inflow Depth > 0.55" for 100 Year event Inflow = 21.75 cfs @ 12.36 hrs, Volume= 3.088 af Primary = 21.75 cfs @ 12.36 hrs, Volume= 3.088 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 25L: C -outfall Hydrograph 24 23- 22- 21- 20- 19 1-20-19 18 17 16; 15= 14- 13 13- 3 12= 2 11 u. 10- 9 8= 73 6- 4= 3� 24 1- 0 21.75 cfs Inflow Area=67.658 ac 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Inflow — Primary Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 16 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Hydrograph for Link 25L: C -outfall Time Inflow Elevation Primary Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 13.25 6.24 0.00 6.24 0.25 0.00 0.00 0.00 13.50 5.00 0.00 5.00 0.50 0.00 0.00 0.00 13.75 4.26 0.00 4.26 0.75 0.00 0.00 0.00 14.00 3.74 0.00 3.74 1.00 0.00 0.00 0.00 14.25 3.35 0.00 3.35 1.25 0.00 0.00 0.00 14.50 3.06 0.00 3.06 1.50 0.00 0.00 0.00 14.75 2.86 0.00 2.86 1.75 0.00 0.00 0.00 15.00 2.71 0.00 2.71 2.00 0.00 0.00 0.00 15.25 2.58 0.00 2.58 2.25 0.00 0.00 0.00 15.50 2.46 0.00 2.46 2.50 0.00 0.00 0.00 15.75 2.34 0.00 2.34 2.75 0.00 0.00 0.00 16.00 2.22 0.00 2.22 3.00 0.00 0.00 0.00 16.25 2.10 0.00 2.10 3.25 0.00 0.00 0.00 16.50 1.99 0.00 1.99 3.50 0.00 0.00 0.00 16.75 1.92 0.00 1.92 3.75 0.00 0.00 0.00 17.00 1.86 0.00 1.86 4.00 0.00 0.00 0.00 17.25 1.82 0.00 1.82 4.25 0.00 0.00 0.00 17.50 1.77 0.00 1.77 4.50 0.00 0.00 0.00 17.75 1.73 0.00 1.73 4.75 0.00 0.00 0.00 18.00 1.68 0.00 1.68 5.00 0.00 0.00 0.00 18.25 1.63 0.00 1.63 5.25 0.00 0.00 0.00 18.50 1.59 0.00 1.59 5.50 0.00 0.00 0.00 18.75 1.54 0.00 1.54 5.75 0.00 0.00 0.00 19.00 1.49 0.00 1.49 6.00 0.00 0.00 0.00 19.25 1.44 0.00 1.44 6.25 0.00 0.00 0.00 19.50 1.39 0.00 1.39 6.50 0.00 0.00 0.00 19.75 1.34 0.00 1.34 6.75 0.00 0.00 0.00 20.00 1.29 0.00 1.29 7.00 0.00 0.00 0.00 20.25 1.24 0.00 1.24 7.25 0.00 0.00 0.00 20.50 1.20 0.00 1.20 7.50 0.00 0.00 0.00 20.75 1.18 0.00 1.18 7.75 0.00 0.00 0.00 21.00 1.16 0.00 1.16 8.00 0.00 0.00 0.00 21.25 1.15 0.00 1.15 8.25 0.00 0.00 0.00 21.50 1.14 0.00 1.14 8.50 0.00 0.00 0.00 21.75 1.13 0.00 1.13 8.75 0.00 0.00 0.00 22.00 1.12 0.00 1.12 9.00 0.00 0.00 0.00 22.25 1.12 0.00 1.12 9.25 0.00 0.00 0.00 22.50 1.11 0.00 1.11 9.50 0.00 0.00 0.00 22.75 1.10 0.00 1.10 9.75 0.00 0.00 0.00 23.00 1.09 0.00 1.09 10.00 0.00 0.00 0.00 23.25 1.08 0.00 1.08 10.25 0.00 0.00 0.00 23.50 1.07 0.00 1.07 10.50 0.00 0.00 0.00 23.75 1.06 0.00 1.06 10.75 0.00 0.00 0.00 24.00 1.05 0.00 1.05 11.00 0.00 0.00 0.00 11.25 0.00 0.00 0.00 11.50 0.00 0.00 0.00 11.75 0.01 0.00 0.01 12.00 6.02 0.00 6.02 12.25 19.36 0.00 19.36 12.50 19.43 0.00 19.43 12.75 12.72 0.00 12.72 13.00 8.42 0.00 8.42 1 1 11 11 1 1 1 1 1 11 11 11 11 11 1 11 1 u 11 q 11 11 11 11 11 1 1 1 11 11 11 11 1 1 1 1 1 1 1 Reach 4S Area D PRE Drainage Diagram for Pre -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Pre -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 21.280 56 Brush, Fair, HSG B (4S) 13.600 70 Brush, Fair, HSG C (4S) 69.440 73 Woods, Fair, HSG C (4S) 104.320 II 11 11 11 11 1 1 1 11 11 11 11 II II 11 II II II II I I I I 11 11 11 il 1 1 II 11 11 11 II II II 11 11 11 II Pre -Development Type 11 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=5.00-24.00 hrs, dt=0.05 hrs, 381 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 4S: Area D Runoff Area=104.320 ac Runoff Depth>0.51" Flow Length=4,091' Tc=32.1 min CN=69 Runoff=34.00 cfs 4.422 af Total Runoff Area = 104.320 ac Runoff Volume = 4.422 af Average Runoff Depth = 0.51" 100.00% Pervious Area = 104.320 ac 0.00% Impervious Area = 0.000 ac Pre -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 YEAR Rainfall=2.70" Page 4 3/6/2007 Subcatchment 4S: Area D Runoff = 34.00 cfs @ 12.33 hrs, Volume= 4.422 af, Depth> 0.51" Runoff by SCS TR -20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 YEAR Rainfall=2.70" Area (ac) CN Description 21.280 56 13.600 70 69.440 73 Brush, Fair, HSG B Brush, Fair, HSG C Woods, Fair, HSG C 104.320 69 104.320 Tc (min) Length (feet) Weighted Average Pervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 22.1 8.9 1.1 100 3,138 853 0.0575 0.08 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 0.1339 5.89 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.1638 13.01 29.92 Channel Flow, Area= 2.3 sf Perim= 4.4' r= 0.52' n= 0.030 32.1 4,091 Total 38- 36= 34H. 32= 30 28- 26= 24H w 22H 20 0 18- i` 16] 14= 12" 10= 84 Subcatchment 4S: Area D Hydrograph 6= 2- 0t-.�, 5 6 7 8 9 34.00 cfs Type II 24 -hr 100 YEAR Rainfall=2.70" Runoff Area=104.320 ac Runoff Volume=4.422 af Runoff Depth>0.51" Flow Length=4,091' Tc=32.1 m i n CN=69 10 11 1 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff 11 1 1 1 11 11 11 11 1 11 1 11 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 4S: Area D Type 11 24 -hr 100 YEAR Rainfall=2.70" Page 5 3/6/2007 Time Precip. Excess (hours) (inches) (inches) 5.00 0.17 0.00 5.25 0.18 0.00 5.50 0.19 0.00 5.75 0.20 0.00 6.00 0.22 0.00 6.25 0.23 0.00 6.50 0.24 0.00 6.75 0.25 0.00 7.00 0.27 0.00 7.25 0.28 0.00 7.50 0.29 0.00 7.75 0.31 0.00 8.00 0.32 0.00 8.25 0.34 0.00 8.50 0.36 0.00 8.75 0.38 0.00 9.00 0.40 0.00 9.25 0.42 0.00 9.50 0.44 0.00 9.75 0.46 0.00 10.00 0.49 0.00 10.25 0.52 0.00 10.50 0.55 0.00 10.75 0.59 0.00 11.00 0.63 0.00 11.25 0.69 0.00 11.50 0.76 0.00 11.75 1.04 0.00 12.00 1.79 0.15 12.25 1.91 0.18 12.50 1.98 0.21 12.75 2.04 0.23 13.00 2.08 0.25 13.25 2.12 0.26 13.50 2.16 0.28 13.75 2.19 0.29 14.00 2.21 0.30 14.25 2.24 0.31 14.50 2.26 0.32 14.75 2.28 0.33 15.00 2.30 0.34 15.25 2.32 0.34 15.50 2.34 0.35 15.75 2.36 0.36 16.00 2.38 0.37 16.25 2.39 0.37 16.50 2.41 0.38 16.75 2.42 0.39 17.00 2.43 0.39 17.25 2.45 0.40 17.50 2.46 0.40 17.75 2.47 0.41 18.00 2.49 0.41 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 5.36 31.93 27.22 16.38 10.95 8.35 6.90 5.94 5.28 4.74 4.35 4.11 3.92 3.75 3.57 3.39 3.21 3.03 2.88 2.79 2.72 2.65 2.59 2.52 2.46 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.25 2.50 0.42 2.39 18.50 2.51 0.43 2.32 18.75 2.52 0.43 2.25 19.00 2.53 0.44 2.18 19.25 2.54 0.44 2.11 19.50 2.55 0.44 2.03 19.75 2.56 0.45 1.96 20.00 2.57 0.45 1.88 20.25 2.58 0.46 1.81 20.50 2.59 0.46 1.75 20.75 2.60 0.47 1.73 21.00 2.60 0.47 1.71 21.25 2.61 0.47 1.70 21.50 2.62 0.48 1.69 21.75 2.63 0.48 1.67 22.00 2.64 0.49 1.66 22.25 2.65 0.49 1.65 22.50 2.65 0.49 1.64 22.75 2.66 0.50 1.62 23.00 2.67 0.50 1.61 23.25 2.68 0.50 1.60 23.50 2.68 0.51 1.59 23.75 2.69 0.51 1.57 24.00 2.70 0.52 1.56 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Subcat Reach 4S D -Outfall Drainage Diagram for Post -Development Prepared by Gamba & Associates. Inc. 3/6/2007 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 1 Post -Development ' Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 20.440 56 Brush, Fair, HSG B (4S,26S) 12.840 70 Brush, Fair, HSG C (4S,26S) 65.270 73 Woods, Fair, HSG C (4S) 0.550 74 >75% Grass cover, Good, HSG C (4S) 5.230 98 Paved roads w/curbs & sewers (4S) 104.330 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 4S: Area -D Runoff Area=83.990 ac Runoff Depth>0.63" Flow Length=3,238' Tc=23.6 min CN=72 Runoff=46.01 cfs 4.411 af Subcatchment 26S: D -Bypass Runoff Area=20.340 ac Runoff Depth>0.31" Tc=5.0 min CN=63 Runoff=8.33 cfs 0.532 af Pond 8P: Pond D Peak Elev=8,618.96' Storage=0.777 af Inflow=46.01 cfs 4.411 af Outflow=23.92 cfs 4.344 af Link 27L: D -Outfall Inflow=25.34 cfs 4.876 af Primary=25.34 cfs 4.876 af Total Runoff Area = 104.330 ac Runoff Volume = 4.943 af Average Runoff Depth = 0.57" 94.99% Pervious Area = 99.100 ac 5.01% Impervious Area = 5.230 ac Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 4 3/6/2007 Subcatchment 4S: Area -D Runoff = 46.01 cfs @ 12.20 hrs, Volume= 4.411 af, Depth> 0.63" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type 11 24 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 9.820 56 3.120 70 65.270 73 0.550 74 5.230 98 Brush, Fair, HSG B Brush, Fair, HSG C Woods, Fair, HSG C >75% Grass cover, Good, HSG C Paved roads w/curbs & sewers 83.990 72 78.760 5.230 Tc Length (min) (feet) Weighted Average Pervious Area Impervious Area Slope Velocity (ft/ft) (ft/sec) Capacity Description (cfs) 14.7 100 0.0575 8.9 3,138 0.1339 0.11 Sheet Flow, Grass: Dense n= 0.240 P2= 1.30" 5.89 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 23.6 3,238 Total 3 0 u. Subcatchment 4S: Area -D Hydrograph 48- 46- 44- 42 40= 38= 36 34- 32- 30- 28 26- 24 22 20 18-' 16- 143 12' 10- 6 6 2 0 46.01 cfs Type II 24 -hr 100 Year Rainfall=2.70" Runoff Area=83.990 ac Runoff Volume=4.411 af Runoff Depth>0.63" Flow Length=3,238' Tc=23.6 min CN=72 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 5 3/6/2007 Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.25 0.01 0.00 0.50 0.01 0.00 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 0.02 0.03 0.04 0.04 0.05 0.06 0.07 0.08 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.21 0.25 0.29 0.31 0.33 Hydrograph for Subcatchment 4S: Area -D Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.38 17.66 43.96 21.30 12.11 8.47 Time (hours) 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. Excess Runoff (inches) (inches) (cfs) 2.12 0.35 6.78 2.16 0.36 5.88 2.19 0.37 5.21 2.21 0.39 4.66 2.24 0.40 4.20 2.26 0.41 3.91 2.28 0.42 3.72 2.30 0.43 3.56 2.32 0.44 3.40 2.34 0.45 3.23 2.36 0.46 3.06 2.38 0.47 2.88 2.39 0.47 2.71 2.41 0.48 2.60 2.42 0.49 2.53 2.43 0.50 2.47 2.45 0.50 2.41 2.46 0.51 2.35 2.47 0.52 2.29 2.49 0.52 2.22 2.50 0.53 2.16 2.51 0.53 2.09 2.52 0.54 2.03 2.53 0.55 1.96 2.54 0.55 1.89 2.55 0.56 1.82 2.56 0.56 1.75 2.57 0.57 1.68 2.58 0.57 1.62 2.59 0.57 1.58 2.60 0.58 1.56 2.60 0.58 1.55 2.61 0.59 1.54 2.62 0.59 1.53 2.63 0.60 1.52 2.64 0.60 1.51 2.65 0.61 1.49 2.65 0.61 1.48 2.66 0.61 1.47 2.67 0.62 1.46 2.68 0.62 1.45 2.68 0.63 1.43 2.69 0.63 1.42 2.70 0.64 1.41 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 6 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 26S: D -Bypass [49] Hint: Tc<2dt may require smaller dt Runoff = 8.33 cfs @ 11.99 hrs, Volume= 0.532 af, Depth> 0.31" 1 1 1 1 Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs I Type II 24 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 10.620 56 Brush, Fair, HSG B 9.720 70 Brush, Fair, HSG C 20.340 63 Weighted Average 20.340 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 26S: D -Bypass Hydrograph 18.33 cfs w0 0 u. 4- Type 1124 -hr 100 Year Rainfall=2.70" Runoff Area=20.340 ac Runoff Volume=0.532 of Runoff Depth>0.31" Tc=5.0 min CN=63 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 7 3/6/2007 Time (hours) 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 Precip. Excess (inches) (inches) 0.00 0.00 0.01 0.00 0.01 0.00 0.02 0.03 0.04 0.04 0.05 0.06 0.07 0.08 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 Hydrograph for Subcatchment 26S: D -Bypass 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.06 0.08 0.10 0.11 0.12 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 8.28 1.80 1.29 1.02 0.89 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 13.25 2.12 0.13 0.80 13.50 2.16 0.14 0.72 13.75 2.19 0.15 0.65 14.00 2.21 0.16 0.59 14.25 2.24 0.16 0.56 14.50 2.26 0.17 0.54 14.75 2.28 0.18 0.52 15.00 2.30 0.18 0.50 15.25 2.32 0.19 0.48 15.50 2.34 0.19 0.45 15.75 2.36 0.20 0.43 16.00 2.38 0.20 0.40 16.25 2.39 0.21 0.39 16.50 2.41 0.21 0.38 16.75 2.42 0.22 0.38 17.00 2.43 0.22 0.37 17.25 2.45 0.23 0.36 17.50 2.46 0.23 0.35 17.75 2.47 0.24 0.34 18.00 2.49 0.24 0.33 18.25 2.50 0.24 0.32 18.50 2.51 0.25 0.31 18.75 2.52 0.25 0.31 19.00 2.53 0.25 0.30 19.25 2.54 0.26 0.28 19.50 2.55 0.26 0.27 19.75 2.56 0.26 0.26 20.00 2.57 0.27 0.25 20.25 2.58 0.27 0.25 20.50 2.59 0.27 0.25 20.75 2.60 0.28 0.25 21.00 2.60 0.28 0.24 21.25 2.61 0.28 0.24 21.50 2.62 0.29 0.24 21.75 2.63 0.29 0.24 22.00 2.64 0.29 0.24 22.25 2.65 0.29 0.24 22.50 2.65 0.30 0.24 22.75 2.66 0.30 0.23 23.00 2.67 0.30 0.23 23.25 2.68 0.31 0.23 23.50 2.68 0.31 0.23 23.75 2.69 0.31 0.23 24.00 2.70 0.31 0.23 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 8 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Pond 8P: Pond D Inflow Area = 83.990 ac, Inflow Depth > 0.63" for 100 Year event Inflow = 46.01 cfs @ 12.20 hrs, Volume= 4.411 af Outflow = 23.92 cfs @ 12.46 hrs, Volume= 4.344 af, Atten= 48%, Lag= 15.7 min Primary = 23.92 cfs © 12.46 hrs, Volume= 4.344 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 8,618.96' @ 12.46 hrs Surf.Area= 0.229 ac Storage= 0.777 af Plug -Flow detention time= 22.7 min calculated for 4.344 af (98% of inflow) Center -of -Mass det. time= 14.5 min ( 904.3 - 889.8 ) Volume Invert Avail.Storage Storage Description #1 8,614.00' 1.030 af Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre-feet) (acre-feet) 8,614.00 0.000 0.000 0.000 8,615.00 0.133 0.066 0.066 8,616.00 0.155 0.144 0.210 8,617.00 0.179 0.167 0.378 8,618.00 0.204 0.191 0.569 8,619.00 0.230 0.217 0.786 8,620.00 0.258 0.244 1.030 Device Routing Invert Outlet Devices #1 Primary 8,614.00' 24.0" x 48.0' long Culvert CMP, square edge headwall, Ke= 0.500 Outlet Invert= 8,612.56' S= 0.0300 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior #2 Device 1 8,614.50' 22.0" Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=23.91 cfs @ 12.46 hrs HW=8,618.95' (Free Discharge) =Culvert (Passes 23.91 cfs of 30.08 cfs potential flow) 2=Orifice/Grate (Orifice Controls 23.91 cfs @ 9.06 fps) 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 9 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Pond 8P: Pond D Hydrograph 50- 48' 46 44' 42= 40` 38-= 36T 34= 32 30= u 28 26- 0 24 LL 22- 20-= 18: 16 2-20- 18- 16 14- 12 10' 8-- 6= 4 2- Elevation (feet) Inflow Area=83.990 ac Peak Elev=8,618.96' Storage=0.777 of 8,620 46.01 cfs 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pond 8P: Pond D Stage -Discharge 8,619- 8,618- 8,617- 8,616- 8,615- 8,614 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Discharge (cfs) — Inflow — Primary —Primary` Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 10 3/6/2007 0 8,620` 8,619 8,618- 8 0 8,617- > uJ 8,616- 8,615- 8,614 0 Pond 8P: Pond D Stage -Area -Storage Surface/Horizontal/Wetted Area (acres) 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 I L 1 1 1 . 1 0.2 0.22 0.24 Storage (acre-feet) — Surface — Storage 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Time Inflow 1 (hours) (cfs) 0.00 0.00 0.50 0.00 I 1.00 0.00 1.50 0.00 2.00 0.00 2.50 0.00 I 3.00 0.00 3.50 0.00 4.00 0.00 4.50 0.00 I 5.00 0.00 5.50 0.00 6.00 0.00 I 6.50 0.00 7.00 0.00 7.50 0.00 8.00 0.00 I 8.50 0.00 9.00 0.00 9.50 0.00 10.00 0.00 I 10.50 0.00 11.00 0.00 11.50 0.00 12.00 17.66 I12.50 21.30 13.00 8.47 13.50 5.88 I 14.00 4.66 14.50 3.91 15.00 3.56 15.50 3.23 I 16.00 2.88 16.50 2.60 17.00 2.47 17.50 2.35 I 18.00 2.22 18.50 2.09 19.00 1.96 19.50 1.82 I20.00 1.68 20.50 1.58 21.00 1.55 I 21.50 1.53 22.00 1.51 22.50 1.48 23.00 1.46 I 23.50 1.43 24.00 1.41 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 11 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 1 Hydrograph for Pond 8P: Pond D Storage Elevation Primary (acre-feet) (feet) (cfs) 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.000 8,614.00 0.00 0.104 8,615.28 3.21 0.772 8,618.94 23.86 0.433 8,617.30 17.45 0.190 8,615.87 8.42 0.140 8,615.53 5.26 0.122 8,615.40 4.19 0.114 8,615.34 3.72 0.107 8,615.30 3.38 0.101 8,615.26 3.04 0.095 8,615.21 2.72 0.092 8,615.19 2.54 0.089 8,615.17 2.41 0.086 8,615.15 2.29 0.084 8,615.13 2.16 0.081 8,615.11 2.03 0.078 8,615.09 1.89 0.075 8,615.06 1.76 0.072 8,615.04 1.63 0.071 8,615.03 1.57 0.070 8,615.03 1.54 0.069 8,615.02 1.52 0.069 8,615.02 1.50 0.068 8,615.01 1.47 0.068 8,615.01 1.45 0.067 8,615.00 1.42 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 12 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Stage -Discharge for Pond 8P: Pond D Elevation Primary Elevation Primary Elevation Primary (feet) (cfs) (feet) (cfs) (feet) (cfs) 8,614.00 0.00 8,616.12 10.70 8,618.24 21.36 8,614.04 0.00 8,616.16 11.02 8,618.28 21.51 8,614.08 0.00 8,616.20 11.34 8,618.32 21.66 8,614.12 0.00 8,616.24 11.63 8,618.36 21.81 8,614.16 0.00 8,616.28 11.89 8,618.40 21.95 8,614.20 0.00 8,616.32 12.11 8,618.44 22.10 8,614.24 0.00 8,616.36 12.35 8,618.48 22.25 8,614.28 0.00 8,616.40 12.60 8,618.52 22.39 8,614.32 0.00 8,616.44 12.86 8,618.56 22.54 8,614.36 0.00 8,616.48 13.11 8,618.60 22.68 8,614.40 0.00 8,616.52 13.35 8,618.64 22.82 8,614.44 0.00 8,616.56 13.59 8,618.68 22.96 8,614.48 0.00 8,616.60 13.83 8,618.72 23.10 8,614.52 0.00 8,616.64 14.06 8,618.76 23.24 8,614.56 0.02 8,616.68 14.29 8,618.80 23.38 8,614.60 0.06 8,616.72 14.51 8,618.84 23.52 8,614.64 0.12 8,616.76 14.73 8,618.88 23.65 8,614.68 0.19 8,616.80 14.95 8,618.92 23.79 8,614.72 0.29 8,616.84 15.16 8,618.96 23.93 8,614.76 0.40 8,616.88 15.38 8,619.00 24.06 8,614.80 0.53 8,616.92 15.58 8,619.04 24.19 8,614.84 0.67 8,616.96 15.79 8,619.08 24.33 8,614.88 0.83 8,617.00 15.99 8,619.12 24.46 8,614.92 1.01 8,617.04 16.19 8,619.16 24.59 8,614.96 1.20 8,617.08 16.39 8,619.20 24.72 8,615.00 1.40 8,617.12 16.59 8,619.24 24.85 8,615.04 1.62 8,617.16 16.78 8,619.28 24.98 8,615.08 1.86 8,617.20 16.97 8,619.32 25.11 8,615.12 2.11 8,617.24 17.16 8,619.36 25.24 8,615.16 2.37 8,617.28 17.35 8,619.40 25.37 8,615.20 2.64 8,617.32 17.54 8,619.44 25.50 8,615.24 2.92 8,617.36 17.72 8,619.48 25.62 8,615.28 3.22 8,617.40 17.90 8,619.52 25.75 8,615.32 3.52 8,617.44 18.08 8,619.56 25.87 8,615.36 3.84 8,617.48 18.26 8,619.60 26.00 8,615.40 4.16 8,617.52 18.43 8,619.64 26.12 8,615.44 4.50 8,617.56 18.61 8,619.68 26.24 8,615.48 4.84 8,617.60 18.78 8,619.72 26.37 8,615.52 5.19 8,617.64 18.95 8,619.76 26.49 8,615.56 5.54 8,617.68 19.12 8,619.80 26.61 8,615.60 5.91 8,617.72 19.29 8,619.84 26.73 8,615.64 6.27 8,617.76 19.46 8,619.88 26.85 8,615.68 6.64 8,617.80 19.62 8,619.92 26.97 8,615.72 7.02 8,617.84 19.79 8,619.96 27.09 8,615.76 7.39 8,617.88 19.95 8,620.00 27.21 8,615.80 7.77 8,617.92 20.11 8,615.84 8.15 8,617.96 20.27 8,615.88 8.53 8,618.00 20.43 8,615.92 8.90 8,618.04 20.59 8,615.96 9.27 8,618.08 20.74 8,616.00 9.64 8,618.12 20.90 8,616.04 10.00 8,618.16 21.05 8,616.08 10.35 8,618.20 21.21 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 13 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Stage -Area -Storage for Pond 8P: Pond D Elevation Surface Storage (feet) (acres) (acre-feet) 8,614.00 8,614.10 8,614.20 8,614.30 8,614.40 8,614.50 8,614.60 8,614.70 8,614.80 8,614.90 8,615.00 8,615.10 8,615.20 8,615.30 8,615.40 8,615.50 8,615.60 8,615.70 8,615.80 8,615.90 8,616.00 8,616.10 8,616.20 8,616.30 8,616.40 8,616.50 8,616.60 8,616.70 8,616.80 8,616.90 8,617.00 8,617.10 8,617.20 8,617.30 8,617.40 8,617.50 8,617.60 8,617.70 8,617.80 8,617.90 8,618.00 8,618.10 8,618.20 8,618.30 8,618.40 8,618.50 8,618.60 8,618.70 8,618.80 8,618.90 8,619.00 8,619.10 8,619.20 0.000 0.013 0.027 0.040 0.053 0.066 0.080 0.093 0.106 0.120 0.133 0.135 0.137 0.140 0.142 0.144 0.146 0.148 0.151 0.153 0.155 0.157 0.160 0.162 0.165 0.167 0.169 0.172 0.174 0.177 0.179 0.182 0.184 0.186 0.189 0.191 0.194 0.197 0.199 0.201 0.204 0.207 0.209 0.212 0.214 0.217 0.220 0.222 0.225 0.227 0.230 0.233 0.236 0.000 0.001 0.003 0.006 0.011 0.017 0.024 0.033 0.043 0.054 0.066 0.080 0.094 0.107 0.121 0.136 0.150 0.165 0.180 0.195 0.210 0.226 0.242 0.258 0.274 0.291 0.308 0.325 0.342 0.360 0.378 0.396 0.414 0.432 0.451 0.470 0.489 0.509 0.529 0.549 0.569 0.590 0.610 0.631 0.653 0.674 0.696 0.718 0.741 0.763 0.786 0.809 0.833 Elevation Surface Storage (feet) (acres) (acre-feet) 8,619.30 0.238 0.856 8,619.40 0.241 0.880 8,619.50 0.244 0.905 8,619.60 0.247 0.929 8,619.70 0.250 0.954 8,619.80 0.252 0.979 8,619.90 0.255 1.004 8,620.00 0.258 1.030 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 14 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Link 27L: D -Outfall Inflow Area = 104.330 ac, Inflow Depth > 0.56" for 100 Year event Inflow = 25.34 cfs @ 12.44 hrs, Volume= 4.876 af Primary = 25.34 cfs @ 12.44 hrs, Volume= 4.876 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 27L: D -Outfall Hydrograph 28- 26- 24 22 20 18 12 10 8� 6- 2- I 25.34 125.34 cfs I Inflow Area=104.330 ac 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Inflow II — Primary 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 15 3/6/2007 Time (hours) 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 Inflow Elevation (cfs) (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 11.49 22.73 25.15 22.59 18.34 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Hydrograph for Link 27L: D -Outfall Primary Time (cfs) (hours) 0.00 13.25 0.00 13.50 0.00 13.75 0.00 14.00 0.00 14.25 0.00 14.50 0.00 14.75 0.00 15.00 0.00 15.25 0.00 15.50 0.00 15.75 0.00 16.00 0.00 16.25 0.00 16.50 0.00 16.75 0.00 17.00 0.00 17.25 0.00 17.50 0.00 17.75 0.00 18.00 0.00 18.25 0.00 18.50 0.00 18.75 0.00 19.00 0.00 19.25 0.00 19.50 0.00 19.75 0.00 20.00 0.00 20.25 0.00 20.50 0.00 20.75 0.00 21.00 0.00 21.25 0.00 21.50 0.00 21.75 0.00 22.00 0.00 22.25 0.00 22.50 0.00 22.75 0.00 23.00 0.00 23.25 0.00 23.50 0.00 23.75 0.00 24.00 0.00 0.00 0.00 0.00 11.49 22.73 25.15 22.59 18.34 Inflow (cfs) 13.50 9.14 6.92 5.85 5.19 4.73 4.44 4.22 4.02 3.83 3.64 3.44 3.26 3.10 2.99 2.91 2.83 2.76 2.69 2.62 2.55 2.48 2.40 2.32 2.25 2.17 2.09 2.01 1.94 1.88 1.84 1.82 1.80 1.79 1.77 1.76 1.75 1.73 1.72 1.70 1.69 1.68 1.66 1.65 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 13.50 9.14 6.92 5.85 5.19 4.73 4.44 4.22 4.02 3.83 3.64 3.44 3.26 3.10 2.99 2.91 2.83 2.76 2.69 2.62 2.55 2.48 2.40 2.32 2.25 2.17 2.09 2.01 1.94 1.88 1.84 1.82 1.80 1.79 1.77 1.76 1.75 1.73 1.72 1.70 1.69 1.68 1.66 1.65 Subcat -1 Reach Area E PRE Drainage Diagram for Pre -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Pre -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 13.610 48 Oak/aspen range, Fair, HSG B (5S) 49.520 57 Oak/aspen range, Fair, HSG C (5S) 12.200 58 Meadow, non -grazed, HSG B (5S) 70.670 60 Woods, Fair, HSG B (5S) 27.130 71 Meadow, non -grazed, HSG C (5S) 25.220 73 Woods, Fair, HSG C (5S) 198.350 Pre -Development Type 11 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=5.00-24.00 hrs, dt=0.05 hrs, 381 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 5S: Area E Runoff Area=198.350 ac Runoff Depth>0.25" Flow Length=4,728' Tc=37.8 min CN=61 Runoff=18.20 cfs 4.181 af Total Runoff Area = 198.350 ac Runoff Volume = 4.181 af Average Runoff Depth = 0.25" '100.00% Pervious Area = 198.350 ac 0.00% Impervious Area = 0.000 ac Pre -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 YEAR Rainfall=2.70" Page 4 3/6/2007 Subcatchment 5S: Area E Runoff = 18.20 cfs @ 12.50 hrs, Volume= 4.181 af, Depth> 0.25" Runoff by SCS TR -20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 YEAR Rainfall=2.70" Area (ac) CN Description 13.610 48 49.520 57 70.670 60 25.220 73 27.130 71 12.200 58 Oak/aspen range, Fair, HSG B Oak/aspen range, Fair, HSG C Woods, Fair, HSG B Woods, Fair, HSG C Meadow, non -grazed, HSG C Meadow, non -grazed, HSG B 198.350 61 198.350 Tc Length (min) (feet) Weighted Average Pervious Area Slope (ft/ft) Velocity Capacity (ft/sec) (cfs) Description 22.4 100 0.0200 0.07 Sheet Flow, Grass: Dense n= 0.240 P2= 1.30" 12.2 2,906 0.0606 3.96 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 3.2 1,722 0.0327 8.96 77.93 Channel Flow, Area= 8.7 sf Perim= 8.7' r= 1.00' n= 0.030 37.8 4,728 Total Subcatchment 5S: Area E Hydrograph 20= 19: 18= 17= 16= 15= 14= 13= 12= , 11-1 10- 0 LL 9' 84 7. 6 5 4 3 2 1 0 118.20 cfs I Type II 24 -hr 100 YEAR Rainfall=2.70" Runoff Area=198.350 ac Runoff Volume=4.181 af Runoff Depth>0.25" Flow Length=4,728' Tc=37.8 m i n CN=61 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff Pre -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 YEAR Rainfall=2.70" Page 5 3/6/2007 Time (hours) 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 Precip. (inches) 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 2.12 2.16 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2.43 2.45 2.46 2.47 2.49 Excess (inches) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.04 0.06 0.07 0.08 0.09 0.10 0.11 0.11 0.12 0.13 0.13 0.14 0.14 0.15 0.15 0.16 0.16 0.16 0.17 0.17 0.18 0.18 0.18 0.19 0.19 Hydrograph for Subcatchment 5S: Area E Runoff cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.59 11.15 18.19 14.65 11.27 9.09 7.73 6.81 6.09 5.50 5.06 4.77 4.58 4.40 4.23 4.04 3.85 3.65 3.48 3.37 3.29 3.22 3.15 3.09 3.02 Time (hours) 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess (inches) 0.20 0.20 0.20 0.21 0.21 0.21 0.21 0.22 0.22 0.22 0.23 0.23 0.23 0.23 0.24 0.24 0.24 0.24 0.25 0.25 0.25 0.25 0.26 0.26 Runoff (cfs) 2.94 2.87 2.79 2.71 2.63 2.55 2.46 2.37 2.28 2.21 2.17 2.15 2.14 2.12 2.11 2.10 2.09 2.08 2.06 2.05 2.04 2.03 2.01 2.00 / \ ! Subcat Reach 28S 9S) Arela-E E -Bypass E 29L E -Outfall Drainage Diagram for Post -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Post-Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 12.180 48 Oak/aspen range, Fair, HSG B (9S) 48.580 57 Oak/aspen range, Fair, HSG C (9S,28S) 12.200 58 Meadow, non-grazed, HSG B (9S) 71.620 60 Woods, Fair, HSG B (9S) 24.810 71 Meadow, non-grazed, HSG C (9S,28S) 25.110 73 Woods, Fair, HSG C (9S,28S) 0.280 74 >75% Grass cover, Good, HSG C (9S) 3.900 98 Paved roads w/curbs & sewers (9S) 198.680 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 9S: Area -E Subcatchment 28S: E -Bypass Pond 9P: Pond E Link 29L: E -Outfall Runoff Area=162.270 ac Runoff Depth>0.25" Flow Length=3,848' Tc=42.5 min CN=61 Runoff=13.88 cfs 3.411 af Runoff Area=36.410 ac Runoff Depth>0.47" Flow Length=1,041' Tc=41.8 min CN=68 Runoff=8.79 cfs 1.425 af Peak Elev=9,194.96' Storage=0.465 af Inflow=13.88 cfs 3.411 af Outflow=8.00 cfs 3.310 af Inflow=14.20 cfs 4.736 af Primary=14.20 cfs 4.736 af Total Runoff Area = 198.680 ac Runoff Volume = 4.836 af Average Runoff Depth = 0.29" 98.04% Pervious Area = 194.780 ac 1.96% Impervious Area = 3.900 ac Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 4 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 9S: Area -E Runoff = 13.88 cfs @ 12.58 hrs, Volume= 3.411 af, Depth> 0.25" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 12.180 48 Oak/aspen range, Fair, HSG B 38.520 57 Oak/aspen range, Fair, HSG C 12.200 58 Meadow, non -grazed, HSG B 17.100 71 Meadow, non -grazed, HSG C 71.620 60 Woods, Fair, HSG B 6.470 73 Woods, Fair, HSG C 0.280 74 >75% Grass cover, Good, HSG C 3.900 98 Paved roads w/curbs & sewers 162.270 158.370 3.900 61 Weighted Average Pervious Area Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 21.2 9.3 12.0 100 0.0635 2,387 0.0713 1,361 0.0138 0.08 Sheet Flow, Woods: Light underbrush n= 0.400 4.30 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 1.89 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps P2= 1.30" 42.5 3,848 Total Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 5 3/6/2007 Subcatchment 9S: Area -E Hydrograph 5-_ 3-- 2- 0 13.88 cfs l Type II 24 -hr 100 Year Rainfall=2.70" Runoff Area=162.270 ac Runoff Volume=3.411 of Runoff Depth>0.25" Flow Length=3,848' Tc=42.5 m i n CN=61 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 6 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time (hours) 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 Precip. (inches) 0.00 0.01 0.01 0.02 0.03 0.04 0.04 0.05 0.06 0.07 0.08 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 Excess (inches) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.04 0.06 0.07 0.08 0.09 Hydrograph for Subcatchment 9S: Area -E Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.33 6.68 13.53 12.49 9.80 Time (hours) 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.12 2.16 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2.43 2.45 2.46 2.47 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess (inches) 0.10 0.11 0.11 0.12 0.13 0.13 0.14 0.14 0.15 0.15 0.16 0.16 0.16 0.17 0.17 0.18 0.18 0.18 0.19 0.19 0.20 0.20 0.20 0.21 0.21 0.21 0.21 0.22 0.22 0.22 0.23 0.23 0.23 0.23 0.24 0.24 0.24 0.24 0.25 0.25 0.25 0.25 0.26 0.26 Runoff (cfs) 7.90 6.66 5.82 5.18 4.66 4.25 3.98 3.80 3.65 3.50 3.35 3.20 3.03 2.89 2.78 2.71 2.65 2.60 2.54 2.48 2.42 2.36 2.30 2.24 2.17 2.10 2.03 1.96 1.89 1.83 1.79 1.77 1.75 1.74 1.73 1.72 1.71 1.70 1.69 1.68 1.67 1.66 1.65 1.64 1 ' Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 7 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 28S: E -Bypass ' Runoff = 8.79 cfs @ 12.48 hrs, Volume= 1.425 af, Depth> 0.47" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 Year Rainfall=2.70" 1 Area (ac) CN Description 10.060 57 Oak/aspen range, Fair, HSG C ' 7.710 71 Meadow, non -grazed, HSG C 18.640 73 Woods, Fair, HSG C 36.410 68 Weighted Average ' 36.410 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 37.5 100 0.0153 0.04 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 4.3 941 0.0510 3.64 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 41.8 1,041 Total ' Subcatchment 28S: E -Bypass Hydrograph 1 1 1 0 1 LL 1 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Type II 24 -hr 100 Year Rainfall=2.70" Runoff Area=36.410 ac Runoff Volume=1.425 af Runoff Depth>0.47" Flow Length=1,041' Tc=41.8 m i n CN=68 8.79 cfs Time (hours) 1 1 1 — Runoff Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 8 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time (hours) 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 Precip. (inches) 0.00 0.01 0.01 0.02 0.03 0.04 0.04 0.05 0.06 0.07 0.08 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 Excess (inches) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.13 0.16 0.19 0.21 0.22 Hydrograph for Subcatchment 28S: E -Bypass Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.63 5.90 8.77 6.49 4.49 Time (hours) 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.12 2.16 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2.43 2.45 2.46 2.47 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess Runoff (inches) 0.24 0.25 0.26 0.27 0.28 0.29 0.30 0.31 0.31 0.32 0.33 0.34 0.34 0.35 0.35 0.36 0.37 0.37 0.38 0.38 0.39 0.39 0.40 0.40 0.41 0.41 0.41 0.42 0.42 0.43 0.43 0.43 0.44 0.44 0.45 0.45 0.45 0.46 0.46 0.46 0.47 0.47 0.48 0.48 (cfs) 3.31 2.63 2.21 1.92 1.69 1.52 1.42 1.34 1.28 1.22 1.16 1.10 1.04 0.99 0.95 0.92 0.90 0.87 0.85 0.83 0.81 0.79 0.76 0.74 0.72 0.69 0.67 0.64 0.62 0.60 0.58 0.58 0.57 0.57 0.56 0.56 0.55 0.55 0.54 0.54 0.54 0.53 0.53 0.52 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 9 3/6/2007 Inflow Area = Inflow = Outflow = Primary = Pond 9P: Pond E 162.270 ac, Inflow Depth > 0.25" 13.88 cfs @ 12.58 hrs, Volume= 8.00 cfs @ 13.23 hrs, Volume= 8.00 cfs @ 13.23 hrs, Volume= for 100 Year event 3.411 af 3.310 af, Atten= 42%, Lag= 39.4 min 3.310 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 9,194.96' @ 13.23 hrs Surf.Area= 0.235 ac Storage= 0.465 af Plug -Flow detention time= 37.6 min calculated for 3.310 af (97% of inflow) Center -of -Mass det. time= 23.7 min ( 986.0 - 962.3 ) Volume Invert Avail.Storage Storage Description #1 9,192.00' 0.739 af Custom Stage Data (Prismatic)Listed below (Recalc) Elevation (feet) 9,192.00 9,193.00 9,194.00 9,195.00 9,196.00 Surf.Area (acres) 0.000 0.160 0.197 0.237 0.291 Inc.Store Cum.Store (acre-feet) (acre-feet) 0.000 0.000 0.080 0.080 0.179 0.259 0.217 0.476 0.264 0.739 Device Routing Invert Outlet Devices #1 #2 Primary 9,192.00' Device 1 9,192.50' 18.0" x 52.0' long Culvert CMP, square edge headwall, Ke= 0.500 Outlet Invert= 9,189.55' S= 0.0471 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior 15.0" Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=8.00 cfs @ 13.23 hrs HW=9,194.96' (Free Discharge) L Culvert (Passes 8.00 cfs of 12.64 cfs potential flow) 2=Orifice/Grate (Orifice Controls 8.00 cfs @ 6.52 fps) — Inflow Primary Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 10 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Elevation (feet) Pond 9P: Pond E Hydrograph 15= 14= 13- 12- 11- 10- 9 2-11-10_9 113.88 cfs I Inflow Area=162.270 ac Peak Elev=9,194.96' Storage=0.465 of 1 [8.Oocfs 1 9,196 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pond 9P: Pond E Stage -Discharge 9,195- 9,194- 9,193- 9,192 f--•—+—, . 0 1 2 Discharge (cfs) 10 — Primary Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 11 3/6/2007 Elevation (feet) 0 9,196 ' 9,195- 9,194- 9,193- 9,192 0.02 0.04 0.06 Pond 9P: Pond E Stage -Area -Storage Surface/Horizontal/Wetted Area (acres) 0.08 0.1 0.12 0.14 0.16 0.18 0.2 1 1. 1 1 . 1. 0.22 0.24 0.26 0.28 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 Storage (acre-feet) 0.5 0.55 0.6 0.65 0.7 - Surface ` - Storage 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 12 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Hydrograph for Pond 9P: Pond E Time Inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet) (cfs) 0.00 0.00 0.000 9,192.00 0.00 0.50 0.00 0.000 9,192.00 0.00 1.00 0.00 0.000 9,192.00 0.00 1.50 0.00 0.000 9,192.00 0.00 2.00 0.00 0.000 9,192.00 0.00 2.50 0.00 0.000 9,192.00 0.00 3.00 0.00 0.000 9,192.00 0.00 3.50 0.00 0.000 9,192.00 0.00 4.00 0.00 0.000 9,192.00 0.00 4.50 0.00 0.000 9,192.00 0.00 5.00 0.00 0.000 9,192.00 0.00 5.50 0.00 0.000 9,192.00 0.00 6.00 0.00 0.000 9,192.00 0.00 6.50 0.00 0.000 9,192.00 0.00 7.00 0.00 0.000 9,192.00 0.00 7.50 0.00 0.000 9,192.00 0.00 8.00 0.00 0.000 9,192.00 0.00 8.50 0.00 0.000 9,192.00 0.00 9.00 0.00 0.000 9,192.00 0.00 9.50 0.00 0.000 9,192.00 0.00 10.00 0.00 0.000 9,192.00 0.00 10.50 0.00 0.000 9,192.00 0.00 11.00 0.00 0.000 9,192.00 0.00 11.50 0.00 0.000 9,192.00 0.00 12.00 0.33 0.001 9,192.12 0.00 12.50 13.53 0.224 9,193.82 4.93 13.00 9.80 0.448 9,194.88 7.84 13.50 6.66 0.451 9,194.89 7.86 14.00 5.18 0.381 9,194.59 7.15 14.50 4.25 0.299 9,194.20 6.14 15.00 3.80 0.233 9,193.87 5.09 15.50 3.50 0.191 9,193.64 4.28 16.00 3.20 0.166 9,193.51 3.63 16.50 2.89 0.151 9,193.43 3.19 17.00 2.71 0.142 9,193.37 2.89 17.50 2.60 0.136 9,193.34 2.71 18.00 2.48 0.131 9,193.31 2.58 18.50 2.36 0.127 9,193.29 2.46 19.00 2.24 0.123 9,193.26 2.34 19.50 2.10 0.119 9,193.24 2.21 20.00 1.96 0.115 9,193.21 2.07 20.50 1.83 0.110 9,193.18 1.94 21.00 1.77 0.106 9,193.16 1.83 21.50 1.74 0.105 9,193.15 1.77 22.00 1.72 0.103 9,193.14 1.74 22.50 1.70 0.103 9,193.14 1.72 23.00 1.68 0.102 9,193.13 1.70 23.50 1.66 0.101 9,193.13 1.68 24.00 1.64 0.100 9,193.13 1.66 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 13 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Elevation Primary I (feet) (cfs) 9,192.00 0.00 9,192.02 0.00 I 9,192.04 0.00 9,192.06 0.00 9,192.08 0.00 9,192.10 0.00 I 9,192.12 0.00 9,192.14 0.00 9,192.16 0.00 9,192.18 0.00 I 9,192.20 0.00 9,192.22 0.00 9,192.24 0.00 I 9,192.26 0.00 9,192.28 0.00 9,192.30 0.00 9,192.32 0.00 I 9,192.34 0.00 9,192.36 0.00 9,192.38 0.00 9,192.40 0.00 I 9,192.42 0.00 9,192.44 0.00 9,192.46 0.00 9,192.48 0.00 I9,192.50 0.00 9,192.52 0.00 9,192.54 0.01 I 9,192.56 0.02 9,192.58 0.03 9,192.60 0.05 9,192.62 0.07 I 9,192.64 0.10 9,192.66 0.12 9,192.68 0.16 9,192.70 0.19 I 9,192.72 0.23 9,192.74 0.27 9,192.76 0.32 I 9,192.78 0.37 9,192.80 0.42 9,192.82 0.48 9,192.84 0.54 I 9,192.86 0.60 9,192.88 0.66 9,192.90 0.73 9,192.92 0.80 I 9,192.94 0.87 9,192.96 0.95 9,192.98 1.02 9,193.00 1.10 I9,193.02 1.19 9,193.04 1.27 1 Stage -Discharge for Pond 9P: Pond E Elevation Primary (feet) (cfs) 9,193.06 9,193.08 9,193.10 9,193.12 9,193.14 9,193.16 9,193.18 9,193.20 9,193.22 9,193.24 9,193.26 9,193.28 9,193.30 9,193.32 9,193.34 9,193.36 9,193.38 9,193.40 9,193.42 9,193.44 9,193.46 9,193.48 9,193.50 9,193.52 9,193.54 9,193.56 9,193.58 9,193.60 9,193.62 9,193.64 9,193.66 9,193.68 9,193.70 9,193.72 9,193.74 9,193.76 9,193.78 9,193.80 9,193.82 9,193.84 9,193.86 9,193.88 9,193.90 9,193.92 9,193.94 9,193.96 9,193.98 9,194.00 9,194.02 9,194.04 9,194.06 9,194.08 9,194.10 1.36 1.45 1.54 1.63 1.72 1.82 1.92 2.01 2.11 2.22 2.32 2.42 2.53 2.63 2.74 2.84 2.95 3.06 3.16 3.27 3.37 3.48 3.58 3.69 3.79 3.89 3.99 4.08 4.18 4.27 4.36 4.44 4.52 4.59 4.65 4.71 4.78 4.85 4.93 5.00 5.07 5.13 5.20 5.27 5.33 5.40 5.46 5.53 5.59 5.65 5.71 5.77 5.83 Elevation Primary (feet) (cfs) 9,194.12 9,194.14 9,194.16 9,194.18 9,194.20 9,194.22 9,194.24 9,194.26 9,194.28 9,194.30 9,194.32 9,194.34 9,194.36 9,194.38 9,194.40 9,194.42 9,194.44 9,194.46 9,194.48 9,194.50 9,194.52 9,194.54 9,194.56 9,194.58 9,194.60 9,194.62 9,194.64 9,194.66 9,194.68 9,194.70 9,194.72 9,194.74 9,194.76 9,194.78 9,194.80 9,194.82 9,194.84 9,194.86 9,194.88 9,194.90 9,194.92 9,194.94 9,194.96 9,194.98 9,195.00 9,195.02 9,195.04 9,195.06 9,195.08 9,195.10 9,195.12 9,195.14 9,195.16 5.89 5.95 6.01 6.07 6.13 6.18 6.24 6.30 6.35 6.41 6.46 6.51 6.57 6.62 6.67 6.72 6.78 6.83 6.88 6.93 6.98 7.03 7.08 7.13 7.18 7.22 7.27 7.32 7.37 7.42 7.46 7.51 7.56 7.60 7.65 7.69 7.74 7.78 7.83 7.87 7.92 7.96 8.00 8.05 8.09 8.13 8.18 8.22 8.26 8.30 8.35 8.39 8.43 Elevation Primary (feet) (cfs) 9,195.18 9,195.20 9,195.22 9,195.24 9,195.26 9,195.28 9,195.30 9,195.32 9,195.34 9,195.36 9,195.38 9,195.40 9,195.42 9,195.44 9,195.46 9,195.48 9,195.50 9,195.52 9,195.54 9,195.56 9,195.58 9,195.60 9,195.62 9,195.64 9,195.66 9,195.68 9,195.70 9,195.72 9,195.74 9,195.76 9,195.78 9,195.80 9,195.82 9,195.84 9,195.86 9,195.88 9,195.90 9,195.92 9,195.94 9,195.96 9,195.98 9,196.00 8.47 8.51 8.55 8.59 8.63 8.67 8.71 8.75 8.79 8.83 8.87 8.91 8.95 8.99 9.03 9.07 9.11 9.14 9.18 9.22 9.26 9.30 9.33 9.37 9.41 9.44 9.48 9.52 9.56 9.59 9.63 9.66 9.70 9.74 9.77 9.81 9.84 9.88 9.91 9.95 9.98 10.02 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 14 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Stage -Area -Storage for Pond 9P: Pond E Elevation Surface Storage Elevation Surface Storage (feet) (acres) (acre-feet) (feet) (acres) (acre-feet) 9,192.00 0.000 0.000 9,194.65 0.223 0.395 9,192.05 0.008 0.000 9,194.70 0.225 0.406 9,192.10 0.016 0.001 9,194.75 0.227 0.418 9,192.15 0.024 0.002 9,194.80 0.229 0.429 9,192.20 0.032 0.003 9,194.85 0.231 0.440 9,192.25 0.040 0.005 9,194.90 0.233 0.452 9,192.30 0.048 0.007 9,194.95 0.235 0.464 9,192.35 0.056 0.010 9,195.00 0.237 0.476 9,192.40 0.064 0.013 9,195.05 0.240 0.487 9,192.45 0.072 0.016 9,195.10 0.242 0.499 9,192.50 0.080 0.020 9,195.15 0.245 0.512 9,192.55 0.088 0.024 9,195.20 0.248 0.524 9,192.60 0.096 0.029 9,195.25 0.250 0.536 9,192.65 0.104 0.034 9,195.30 0.253 0.549 9,192.70 0.112 0.039 9,195.35 0.256 0.562 9,192.75 0.120 0.045 9,195.40 0.259 0.575 9,192.80 0.128 0.051 9,195.45 0.261 0.588 9,192.85 0.136 0.058 9,195.50 0.264 0.601 9,192.90 0.144 0.065 9,195.55 0.267 0.614 9,192.95 0.152 0.072 9,195.60 0.269 0.627 9,193.00 0.160 0.080 9,195.65 0.272 0.641 9,193.05 0.162 0.088 9,195.70 0.275 0.655 9,193.10 0.164 0.096 9,195.75 0.277 0.668 9,193.15 0.166 0.104 9,195.80 0.280 0.682 9,193.20 0.167 0.113 9,195.85 0.283 0.696 9,193.25 0.169 0.121 9,195.90 0.286 0.711 9,193.30 0.171 0.130 9,195.95 0.288 0.725 9,193.35 0.173 0.138 9,196.00 0.291 0.739 9,193.40 0.175 0.147 9,193.45 0.177 0.156 9,193.50 0.179 0.165 9,193.55 0.180 0.174 9,193.60 0.182 0.183 9,193.65 0.184 0.192 9,193.70 0.186 0.201 9,193.75 0.188 0.210 9,193.80 0.190 0.220 9,193.85 0.191 0.229 9,193.90 0.193 0.239 9,193.95 0.195 0.249 9,194.00 0.197 0.259 9,194.05 0.199 0.268 9,194.10 0.201 0.278 9,194.15 0.203 0.288 9,194.20 0.205 0.299 9,194.25 0.207 0.309 9,194.30 0.209 0.319 9,194.35 0.211 0.330 9,194.40 0.213 0.340 9,194.45 0.215 0.351 9,194.50 0.217 0.362 9,194.55 0.219 0.373 9,194.60 0.221 0.384 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 15 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Link 29L: E -Outfall Inflow Area = 198.680 ac, Inflow Depth > 0.29" for 100 Year event Inflow = 14.20 cfs @ 12.60 hrs, Volume= 4.736 af Primary = 14.20 cfs @ 12.60 hrs, Volume= 4.736 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 29L: E -Outfall Hydrograph 9 8- 7- 6 5 3- 0 Inflow Area=198.680 ac 11111,11J11 11 1111111 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Inflow II — Primary Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 16 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time (hours) 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 Inflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.63 6.44 13.70 13.57 12.33 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Hydrograph for Link 29L: E -Outfall Primary Time (cfs) (hours) 0.00 13.25 0.00 13.50 0.00 13.75 0.00 14.00 0.00 14.25 0.00 14.50 0.00 14.75 0.00 15.00 0.00 15.25 0.00 15.50 0.00 15.75 0.00 16.00 0.00 16.25 0.00 16.50 0.00 16.75 0.00 17.00 0.00 17.25 0.00 17.50 0.00 17.75 0.00 18.00 0.00 18.25 0.00 18.50 0.00 18.75 0.00 19.00 0.00 19.25 0.00 19.50 0.00 19.75 0.00 20.00 0.00 20.25 0.00 20.50 0.00 20.75 0.00 21.00 0.00 21.25 0.00 21.50 0.00 21.75 0.00 22.00 0.00 22.25 0.00 22.50 0.00 22.75 0.00 23.00 0.00 23.25 0.00 23.50 0.00 23.75 0.00 24.00 0.00 0.00 0.00 0.00 0.63 6.44 13.70 13.57 12.33 Inflow (cfs) 11.31 10.50 9.77 9.07 8.35 7.66 7.01 6.43 5.94 5.50 5.08 4.73 4.43 4.18 3.97 3.81 3.69 3.59 3.49 3.41 3.33 3.25 3.16 3.08 2.99 2.90 2.81 2.72 2.62 2.53 2.46 2.40 2.37 2.34 2.32 2.30 2.28 2.27 2.25 2.24 2.23 2.21 2.20 2.18 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 11.31 10.50 9.77 9.07 8.35 7.66 7.01 6.43 5.94 5.50 5.08 4.73 4.43 4.18 3.97 3.81 3.69 3.59 3.49 3.41 3.33 3.25 3.16 3.08 2.99 2.90 2.81 2.72 2.62 2.53 2.46 2.40 2.37 2.34 2.32 2.30 2.28 2.27 2.25 2.24 2.23 2.21 2.20 2.18 Subcat ; Reach] 6S Area F PRE Link Drainage Diagram for Pre -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Pre -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 96.020 57 Oak/aspen range, Fair, HSG C (6S) 96.020 Pre -Development Type 11 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=5.00-24.00 hrs, dt=0.05 hrs, 381 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 6S: Area F Runoff Area=96.020 ac Runoff Depth>0.16" Flow Length=2,111' Tc=23.4 min CN=57 Runoff=4.15 cfs 1.279 af Total Runoff Area = 96.020 ac Runoff Volume = 1.279 af Average Runoff Depth = 0.16" 100.00% Pervious Area = 96.020 ac 0.00% Impervious Area = 0.000 ac Pre -Development Type 11 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 4 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 6S: Area F Runoff = 4.15 cfs @ 12.35 hrs, Volume= 1.279 af, Depth> 0.16" Runoff by SCS TR -20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 YEAR Rainfall=2.70" Area (ac) CN Description 96.020 57 Oak/aspen range, Fair, HSG C 96.020 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 19.8 100 0.0758 0.08 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 3.2 1,542 0.2510 8.07 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.4 469 0.3188 18.74 63.71 Channel Flow, Area= 3.4 sf Perim= 6.2' r= 0.55' n= 0.030 23.4 2,111 Total Subcatchment 6S: Area F Hydrograph I4.15cfs N U 0 U 2- Type II 24 -hr 100 YEAR Rainfall=2.70" Runoff Area=96.020 ac Runoff Volume=1.279 of Runoff Depth>0.16" Flow Length=2,111' Tc=23.4 min CN=57 6 7 8 9 10 11 1'2 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff Pre -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 1124 -hr 100 YEAR Rainfall=2.70" Page 5 3/6/2007 Time Precip. Excess (hours) (inches) (inches) 5.00 0.17 0.00 5.25 0.18 0.00 5.50 0.19 0.00 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 2.12 2.16 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2.43 2.45 2.46 2.47 2.49 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.03 0.03 0.04 0.05 0.05 0.06 0.06 0.06 0.07 0.07 0.08 0.08 0.08 0.09 0.09 0.09 0.10 0.10 0.10 0.10 0.11 0.11 0.11 Hydrograph for Subcatchment 6S: Area F Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.16 3.77 3.84 3.13 2.63 2.33 2.12 1.95 1.80 1.66 1.58 1.54 1.49 1.45 1.39 1.34 1.27 1.21 1.17 1.15 1.13 1.12 1.10 1.07 1.05 Time (hours) 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess Runoff (inches) 0.11 0.12 0.12 0.12 0.12 0.13 0.13 0.13 0.13 0.14 0.14 0.14 0.14 0.14 0.15 0.15 0.15 0.15 0.15 0.15 0.16 0.16 0.16 0.16 (cfs) 1.03 1.00 0.98 0.95 0.92 0.89 0.86 0.83 0.80 0.79 0.78 0.78 0.78 0.77 0.77 0.77 0.77 0.76 0.76 0.75 0.75 0.75 0.74 0.74 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Subcat, Reach Area -F Drainage Diagram for Post -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Post -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 98.730 57 Oak/aspen range, Fair, HSG C (11S) 0.180 74 >75% Grass cover, Good, HSG C (11S) 2.690 98 Paved roads w/curbs & sewers (11S) 101.600 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 11S: Area -F Runoff Area=101.600 ac Runoff Depth>0.18" Flow Length=2,956' Tc=17.6 min CN=58 Runoff=6.96 cfs 1.545 af Total Runoff Area = 101.600 ac Runoff Volume = 1.545 af Average Runoff Depth = 0.18" 97.35% Pervious Area = 98.910 ac 2.65% Impervious Area = 2.690 ac Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 4 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Runoff Subcatchment 11S: Area -F = 6.96 cfs @ 12.21 hrs, Volume= 1.545 af, Depth> 0.18" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 98.730 57 Oak/aspen range, Fair, HSG C 2.690 98 Paved roads w/curbs & sewers 0.180 74 >75% Grass cover, Good, HSG C 101.600 58 Weighted Average 98.910 Pervious Area 2.690 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.7 100 0.1014 0.14 Sheet Flow, Grass: Dense n= 0.240 P2= 1.30" 5.6 2,534 0.2224 7.59 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.3 322 0.4006 21.00 71.42 Channel Flow, Area= 3.4 sf Perim= 6.2' r= 0.55' n= 0.030 17.6 2,956 Total 4 4 Subcatchment 11S: Area -F Hydrograph 1 6.96 cfs 1 i Type II 24 -hr 100 Year Rainfall=2.70" Runoff Area=101.600 ac Runoff Volume=1.545 of Runoff Depth>0.18" Flow Length=2,956' Tc=17.6 min CN=58 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 5 3/6/2007 Time (hours) 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 Precip. (inches) 0.00 0.01 0.01 0.02 0.03 0.04 0.04 0.05 0.06 0.07 0.08 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 Excess (inches) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.03 0.04 0.04 0.05 Hydrograph for Subcatchment 11S: Area -F Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.83 6.66 4.76 3.55 3.02 Time (hours) 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.12 2.16 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2.43 2.45 2.46 2.47 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess (inches) 0.06 0.06 0.07 0.07 0.08 0.08 0.09 0.09 0.09 0.10 0.10 0.11 0.11 0.11 0.12 0.12 0.12 0.12 0.13 0.13 0.13 0.14 0.14 0.14 0.14 0.15 0.15 0.15 0.15 0.15 0.16 0.16 0.16 0.16 0.17 0.17 0.17 0.17 0.17 0.18 0.18 0.18 0.18 0.18 Runoff (cfs) 2.68 2.46 2.25 2.07 1.90 1.83 1.78 1.73 1.67 1.60 1.53 1.45 1.38 1.35 1.33 1.30 1.28 1.26 1.23 1.20 1.17 1.14 1.11 1.08 1.05 1.01 0.98 0.94 0.91 0.90 0.89 0.89 0.89 0.88 0.88 0.88 0.87 0.87 0.86 0.86 0.85 0.85 0.84 0.84 Subcat) Reach Area G PRE Link Drainage Diagram for Pre -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Pre -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 262.620 57 Oak/aspen range, Fair, HSG C (7S) 39.460 70 Brush, Fair, HSG C (7S) 302.080 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Type 11 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=5.00-24.00 hrs, dt=0.05 hrs, 381 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 7S: Area G Runoff Area=302.080 ac Runoff Depth>0.20" Flow Length=6,183' Tc=23.2 min CN=59 Runoff=23.44 cfs 5.159 af Total Runoff Area = 302.080 ac Runoff Volume = 5.159 af Average Runoff Depth = 0.20" 100.00% Pervious Area = 302.080 ac 0.00% Impervious Area = 0.000 ac Pre -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 YEAR Rainfall=2.70" Page 4 3/6/2007 Subcatchment 7S: Area G Runoff = 23.44 cfs @ 12.29 hrs, Volume= 5.159 af, Depth> 0.20" Runoff by SCS TR -20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type 1124 -hr 100 YEAR Rainfall=2.70" Area (ac) CN Description 262.620 57 39.460 70 Oak/aspen range, Fair, HSG C Brush, Fair, HSG C 302.080 59 302.080 Tc Length (min) (feet) 14.7 100 Weighted Average Pervious Area Slope (ft/ft) Velocity Capacity (ft/sec) (cfs) Description 0.1582 5.8 2,945 0.2786 2.7 3,138 0.1582 0.11 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 8.50 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 19.36 220.74 Channel Flow, Area= 11.4 sf Perim= 11.7' r= 0.97' n= 0.030 23.2 6,183 Total 0 LL 26- 25- 23= 22= 21 20= 19 18= 17= 16 15 142 13 12= 11 10- 9_ 8, 7- 6- 5 4- 3= 2= 0 Subcatchment 7S: Area G Hydrograph 5 123.44 cfs I 6 7 8 9 10 11 12 Type II 24 -hr 100 YEAR Rainfall=2.70" Runoff Area=302.080 ac Runoff Volume=5.159 af Runoff Depth>0.20" Flow Length=6,183' Tc=23.2 m i n CN=59 13 14 15 16 17 18 19 20 21 22 23 Time (hours) 24 — Runoff 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Prepared Gamba & Associates, Inc. | vdr~C DO by 8.00 s/n 804370 © 2006 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 7S: Area G Type 824-hr100YEAR Rainfall=2.70" Page 5 3/6/2007 Time Precip. Excess (hours) (inches) (inches) 5.00 0.17 0.00 5.25 0.18 0.00 5.50 019 0.80 5.75 0.20 0.00 6.00 0.22 0.00 6.25 0.23 0.00 6.50 0,24 0.80 6.75 0.25 0.00 7.00 0.27 0.00 7.25 0.28 0.00 7.50 0.29 0.08 7.75 0.31 0.00 8.08 0.32 0.00 0.25 0.34 0.00 850 0.30 0.00 8.75 0.38 0.00 9.00 040 0.00 9.25 0.42 0.00 9.50 0.44 0.00 9.75 0.46 0.00 10.00 0.49 0.00 10.25 0.52 0.00 10.50 0.55 0.08 10.75 0.59 8.00 11.00 0.63 0.00 11.25 0.80 0.00 11.50 0.76 0.00 11.75 1.04 0.00 12D0 1.79 0.02 12.25 1.91 0.04 12.50 1.98 0.05 12.75 2.04 0.08 13.00 2.08 0.06 13.25 2.12 0.07 13.50 2.16 0.08 13.75 2.19 0D8 14.00 2.21 0.09 14.25 2.24 0.08 14.50 2.26 0i10 14.75 2.28 010 15.00 2.30 0.11 15.25 2.32 0.11 16.50 2.34 0.11 15.75 2.36 0.12 18.00 2.38 0.12 18.25 2.39 0.13 18.50 2.41 0.13 16.75 2.42 0.13 17.00 2.43 0.14 17.25 2.45 0.14 17.50 2.46 0.14 17.75 2.47 0.15 18.00 2.49 0.15 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.82 23.09 18.29 13.51 10.83 9.36 8.42 7.80 7.01 6.42 6.08 5.88 5.69 5.49 5.28 5.04 4.79 4.54 4.38 4.31 4.23 4.15 4.07 3.99 3.90 Time Precip. (hours) (inches) 18.25 2.50 18.50 2.51 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess (inches) 0.15 0.16 0.16 0.16 0.16 0.17 0.17 0.17 0.17 0.18 0.18 0.18 0.18 0.19 0.19 0.19 0.19 0.19 0.20 0.20 0.20 0.20 0.21 0.21 Runoff (cfs) 3.80 3.70 3.60 3,50 3.39 3.28 3.17 3.05 2.94 2.88 2.86 2.85 2.84 2.82 2.81 2.80 2.78 2.77 2.75 2.74 2.72 2.70 2.69 2.67 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1111111 1 1 1 1 1 1 (Subcat Reach 12S Area -G Link Drainage Diagram for Post -Development Prepared by Gamba & Associates, Inc. 316/2047 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Post-Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 316/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 245.740 57 Oak/aspen range, Fair, HSG C (12S) 39.040 70 Brush, Fair, HSG C (12S) 0.550 74 >75% Grass cover, Good, HSG C (12S) 12.090 98 Paved roads w/curbs & sewers (12S) 297.420 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfa11=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCADO 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Star -Ind method Subcatchment 12S: Area -G Runoff Area=297.420 ac Runoff Depth>0.23" Flow Length=6,375' Tc=38.4 rein CN=60 Runoff=22.15 cfs 5.631 af Total Runoff Area = 297.420 ac Runoff Volume = 5.631 af Average Runoff Depth = 0.23" 95.94% Pervious Area = 285.330 ac 4.06% Impervious Area =12.090 ac Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 4 2006 HydroCAD Software Solutions LLC Subcatchment 12S: Area -G Runoff = 22.15 cfs @ 12.53 hrs, Volume= 5.631 af, Depths 0.23" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 Year Rainfall=2.70" Type 11 24 -hr 100 Year Rainfall=2.70" Page 4 3/6/2007 Area ac CN Descri.tion 245.740 57 39.040 70 0.550 74 12.090 98 297.420 60 285.330 12.090 Tc (min) 29.4 2.4 1,2 Length (feet) 100 964 669 Oak/aspen range, Fair, HSG C Brush, Fair, HSG C >75% Grass cover, Good, HSG C Paved roads wlcurbs & sewers Weighted Average Pervious Area Impervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.0280 0.1793 0.0980 2.7 1,493 0.3289 2.7 3,149 0.1586 38.4 6,375 Total 0.06 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 6.82 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 9.03 18.06 Channel Flow, Area= 2.0 sf Perim= 4.5' r= 0.44' n= 0.030 Earth, grassed & winding 9.23 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 19.39 221.02 Channel Flow, Area= 11.4 sf Perim= 11.7' r= 0.97' n= 0.030 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 5 HydroCAD® 8,00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 12S: Area -G Hydrograph 24- 23_ 22 21 20- 19= 18= 17 16- 15- ur 14- 13= 0 12- IL, 11 10_ 9- 8 7= 6- 54 4 - Type I124 -hr 100 Year Rainfall=2.70" Runoff Area=297.420 ac Runoff Volume=5.631 of Runoff Depth>0.23" Flow Length=6,375' Tc=38.4 min CN=60 I 22.15 cfs I 2 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) —Runoff Post -Development Prepared by Gamba & Associates, Inc. HydroCADO 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type II 24 -hr 100 Year Rainfall -2.70" Page 6 3/612007 Hydrograph for Subcatchment 12S: Area -G Time Precip. Excess Runoff Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 13.25 2.12 0.08 12.26 0.25 0.01 0.00 0.00 13.50 2.16 0.09 10.53 0.50 0.01 0.00 0.00 13.75 2.19 0.10 9.33 0.75 0.02 0.00 0.00 14.00 2.21 0.10 8.38 1.00 0.03 0.00 0.00 14.25 2.24 0.11 7.59 1.25 0.04 0.00 0.00 14.50 2.26 0.11 6.98 1.50 0.04 0.00 0.00 14.75 2.28 0.12 6.60 1.75 0.05 0.00 0.00 15.00 2.30 0.12 6.33 2.00 0.06 0.00 0.00 15.25 2.32 0.13 6.10 2.25 0.07 0.00 0.00 15.50 2.34 0.13 5.87 2.50 0.08 0.00 0.00 15.75 2.36 0.14 5.62 2.75 0.08 0.00 0.00 16.00 2.38 0.14 5.36 3.00 0.09 0.00 0.00 16.25 2.39 0.14 5.09 3.25 0.10 0.00 0.00 16.50 2.41 0.15 4.86 3.50 0.11 0.00 0.00 16.75 2.42 0.15 4.70 3.75 0.12 0.00 0.00 17.00 2.43 0.16 4.59 4.00 0.13 0.00 0.00 17.25 2.45 0.16 4.50 4.25 0.14 0.00 0.00 17.50 2.46 0.16 4.40 4.50 0.15 0.00 0.00 17.75 2.47 0.17 4.31 4.75 0.16 0.00 0.00 18.00 2.49 0.17 4.22 5.00 0.17 0.00 0.00 18.25 2.50 0.17 4.12 5.25 0.18 0.00 0.00 18.50 2.51 0.18 4,02 5.50 0.19 0.00 0.00 18.75 2.52 0.18 3.91 5.75 0.20 0.00 0.00 19.00 2.53 0.18 3.80 6.00 0.22 0.00 0.00 19.25 2.54 0.19 3,69 6.25 0.23 0.00 0.00 19.50 2.55 0.19 3.58 6.50 0.24 0.00 0.00 19.75 2.56 0.19 3.46 6.75 0.25 0.00 0.00 20.00 2,57 0.19 3.34 7.00 0.27 0.00 0.00 20.25 2.58 0.20 3.21 7.25 0.28 0.00 0.00 20.50 2.59 0.20 3.11 7.50 0.29 0.00 0.00 20.75 2.60 0.20 3.06 7.75 0.31 0.00 0.00 21.00 2.60 0.20 3.02 8.00 0.32 0.00 0.00 21.25 2.61 0.21 3.00 8.25 0.34 0.00 0.00 21.50 2.62 0.21 2.99 8.50 0.36 0.00 0.00 21.75 2.63 0.21 2.97 8.75 0.38 0.00 0.00 22.00 2.64 0.21 2.96 9.00 0.40 0.00 0.00 22.25 2.65 0.22 2.94 9.25 0.42 0.00 0.00 22.50 2.65 0.22 2.93 9.50 0.44 0.00 0.00 22.75 2.66 0.22 2.91 9.75 0.46 0.00 0.00 23.00 2.67 0.22 2.89 10.00 0.49 0.00 0.00 23.25 2.68 0.23 2.88 10.25 0.52 0.00 0.00 23.50 2.68 0.23 2.86 10.50 0.55 0.00 0.00 23.75 2.69 0.23 2.84 10.75 0.59 0.00 0.00 24.00 2.70 0.23 2.82 11.00 0.63 0.00 0.00 11.25 0.69 0.00 0.00 11.50 0.76 0.00 0.00 11.75 1.04 0.00 0.00 12.00 1.79 0.03 0.52 12.25 1.91 0.05 12.34 12.50 1.98 0.06 22.03 12.75 2.04 0.07 18.91 13.00 2.08 0.08 14.96 4ubca> Reach Area H PRE Link Drainage Diagram for Pre -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Pre -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 29.180 56 Brush, Fair, HSG B (8S) 5.950 69 Pasture/grassland/range, Fair, HSG B (8S) 153.850 70 Brush, Fair, HSG C (8S) 20.050 79 Pasture/grassland/range, Fair, HSG C (8S) 209.030 Pre -Development Type 11 24 -hr 100 YEAR Rainfall=2.74" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=5.00-24.00 hrs, dt=0.05 hrs, 381 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 8S: Area H Runoff Area=209.030 ac Runoff Depth>0.51" Flow Length=5,592' Tc=27.0 min CN=69 Runoff=77.25 cfs 8.881 af Total Runoff Area = 209.030 ac Runoff Volume = 8.881 af Average Runoff Depth = 0.51" 100.00% Pervious Area = 209.030 ac 0.00% Impervious Area = 0.000 ac Pre -Development Type 11 24 -hr 100 YEAR Rainfa11=2.70" Prepared by Gamba & Associates, Inc. Page 4 HydroCADO 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 8S: Area H Runoff = 77.25 cfs @ 12.26 hrs, Volume= 8.881 af, Depths 0.51" Runoff by SCS TR -20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 YEAR Rainfall=2.70" Area (ac) CN Description 29.180 56 Brush, Fair, HSG B 153.850 70 Brush, Fair, HSG C 5.950 69 Pasture/grassland/range, Fair, HSG B 20.050 79 Pasture/grassland/range, Fair, HSG C 209.030 69 Weighted Average 209.030 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.3 100 0.2500 0.14 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 12.3 4,726 0.1580 6.40 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 2.4 766 0.1100 5.35 8.57 Channel Flow, Area= 1.6 sf Perim= 8.6' r= 0.19' n= 0.030 27.0 5,592 Total Subcatchment 8S: Area H Hydrograph 85- 80'= 75. 70. 651 60 55 50= 45_ 7. 40 35. 30= 25 201 15- 10 77.25 cfs Type 11 24 -hr 100 YEAR Rainfall=2.10" Runoff Area=209.030 ac Runoff Volume=8.881 af \\\\,.,___________ Runoff Depth?0.51 " Flow Length=5,592' Tc=21.0 m i n CN=69 0 5 fi 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff Pre -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC3/6/2007 Type 11 24 -hr 100 YEAR Rainfall=2,70" Page 5 Time (hours) 5 0 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11,75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18,00 Precip. (inches) 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 2.12 2.16 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2.43 2.45 2.46 2.47 2.49 Excess (inches) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.15 0.18 0.21 0.23 0.25 0.26 0.28 0.29 0.30 0.31 0.32 0.33 0.34 0.34 0.35 0.36 0.37 0.37 0.38 0.39 0.39 0.40 0.40 0.41 0.41 Hydrograph for Subcatchment BS: Area H Runoff 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.04 17.91 77.20 47.37 28.00 19.20 15.22 12.86 11.38 10.19 9.18 8.50 8.08 7.74 7.40 7.05 6.69 6.32 5.95 5.69 5.53 5.40 5.27 5.14 5.01 4.88 Time (hours) 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess (inches) 0.42 0.43 0.43 0.44 0.44 0.44 0.45 0,45 0.46 0.46 0.47 0.47 0.47 0.48 0.48 0.49 0.49 0.49 0.50 0.50 0.50 0.51 0.51 0.52 Runoff (cfs) 4.74 4.61 4.46 4.32 4.17 4.03 3.88 3.73 3.58 3.49 3.44 3.42 3.39 3.37 3.35 3.32 3.30 3.27 3.25 3,22 3.20 3.17 3.14 3.12 4.ubcat Reach <13S> Are-H 33SI /\\3\/ H -Bypass Link Pond H 34L H -Outfall Drainage Diagram for Post -Development Prepared by Gamna & Associates, Inc. 3/6/2007 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Post-Developrnent Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 24.086 56 Brush, Fair, HSG B (13S,33S) 0.344 61 >75% Grass cover, Good, HSG B (13S) 4.930 69 Pasture/grassland/range, Fair, HSG B (138) 151.904 70 Brush, Fair, HSG C (13S,33S) 0.723 74 >75% Grass cover, Good, HSG C (13S,33S) 19.830 79 Pasture/grassland/range, Fair, HSG C (135,33S) 10.067 98 Paved parking & roofs (13S,33S) 211.884 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 316/2007 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR -20 method, UH=SGS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 13S: Area -H Runoff Area=182.359 ac Runoff Depth>0.55' Row Length=4,979' Tc=25.1 min CN=70 Runoff=79.06 cfs 8.337 af Subcatchment 33S: H -Bypass Runoff Area=29.525 ac Runoff Depth>0.63" Tc=5.0 min CN=72 Runoff=31.89 cfs 1.562 af Pond 37P: Pond H Peak Elev=7,422.96' Storage=1.052 af Inflow=79.06 cfs 8.337 af Outflow=56.31 cfs 8.190 af Link 34L: H -Outfall Inflow=60.50 cfs 9.752 af Primary=60.50 cfs 9.752 af Total Runoff Area = 211.884 ac Runoff Volume = 9.899 af Average Runoff Depth = 0.56" 95.25% Pervious Area = 201.817 ac 4.75% Impervious Area = 10.067 ac Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 4 HydroCADD 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 13S: Area -H Runoff = 79.06 cfs @ 12.22 hrs, Volume= 8.337 af, Depths 0.55" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type 11 24 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 23.832 56 Brush, Fair, HSG B 125.326 70 Brush, Fair, HSG C 4.930 69 Pasture/grassland/range, Fair, HSG B 19.079 79 Pasture/grassland/range, Fair, HSG C 0.344 61 >75% Grass cover, Good, HSG B 0.402 74 >75% Grass cover, Good, HSG C 8.446 98 Paved parking & roofs 182.359 70 Weighted Average 173.913 Pervious Area 8.446 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ftlsec) (cfs) 12.3 100 0.2500 0.14 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 12.8 4,879 0.1549 6.34 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 25.1 4,979 Total 0 0 Subcatchment 13S: Area -H Hydrograph 85 80- Type II 24 -hr 100 Year 70- 65 Rainfal 1=2.70" 60 Runoff Area=182,359 ac 55- 50 Runoff Volume=8.337 af 45 Runoff Depth>0.55" 40 35 Flow Length=4,979' 30 25 Tc=25,1 min 1 79.06 #s 1 20 CIV =70 15= 10= 5 0 1 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Time (hours) 9 20 21 22 23 24 Runoff Post -Development Prepared by Gamba & Associates, Inc. HydroCA[xOO.00 sin 004370 © 2006 HydroCAD Software Solutions LLC316/2007 Type 11 24 -hr 100 Year RGinf3ll=270" Page 5 Time (hours) 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.0} 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 Precip. (inches) 0.00 0.01 0.01 0.02 0.03 0.04 0.04 0.05 0.06 0.07 0.08 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 Excess (inches) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.17 0.21 0.23 0.26 0.27 Hydrograph for Subcatchment 13S: Area -H Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.12 23.32 78.15 42.12 24.49 17.01 Time (hours) 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.0O 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 2.12 2.16 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2.43 2.45 2.46 2.47 2.49 2.5O 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess (inches) 0.29 0.30 0.32 0.33 0.34 0.35 0.36 0.37 0.37 0.38 0.39 0.40 8,48 0.41 0.42 0.42 0.43 0.44 0.44 0.45 0.45 0.46 0.47 O47 0.48 0.48 0.48 0.49 0.49 0.50 0.50 0.51 0.51 0.51 0.52 O.S2 0.53 0.53 0,53 0.54 0.54 0.55 0.55 0.55 Runoff (cfs) 13.59 11.65 10.33 9.25 8.33 7.74 7.38 7,08 6.75 6.42 6.09 5.74 5.40 5.18 5.04 4.92 4.80 4.69 4.56 4.44 4.32 4.19 4.06 3.93 3.79 3.66 3.52 3.38 3.24 3.17 3.13 3.11 3.09 3.06 3.04 3.02 3.00 2.97 2.95 2.93 2.90 2.88 2.85 2.83 Post -Development Type 11 24 -hr 100 Year Rainfal1=2.70" Prepared by Gamba & Associates, Inc. Page 6 HydroCAD® 8.00 sin 004370 0 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 33S: H -Bypass [49] Hint: Tc<2dt may require smaller dt Runoff = 31.89 cfs @ 11.97 hrs, Volume= 1.562 af, Depth> 0.63" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type 11 24 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 0.254 56 Brush, Fair, HSG B 26.578 70 Brush, Fair, HSG C 0.751 79 Pasture/grassland/range, Fair, HSG C 0.321 74 >75% Grass cover, Good, HSG C 1.621 98 Paved parking & roofs 29.525 72 Weighted Average 27.904 Pervious Area 1.621 Impervious Area Tc Length Slope Velocity Capacity Description (minL (feet) (ft/ft) (ft/sec) (cfs) 5.0 G ti Direct Entry, Subcatchment 335: H -Bypass Hyd rog raph 34 32= 30 28 26- 24- 22= 20 18T 16- 14- 12= 10= 8= 6 4= 2-5 31.89 cfs Type 1124 -hr 100 Year Rainfall=2.70" Runoff Area=29,525 ac Runoff Volume=1.562 af Runoff 'Depth>0.63" Tc=5.0 min CN=72 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) -- Runoff Post -Development Prepared by Gamba & Associates, Inc. HvdnoCAD®8.O0 sin 004370 C)2UO6HydnnCADSoftware Solutions LLC Type 11 24 -hr 100 Year Rkaioha8=2.7O" Page 7 3/6/2007 Time II:ors) 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 Precip. (inches) 0.00 0.01 0.01 0.02 0.03 0.04 0.04 0.05 0.06 0.07 0.08 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 Excess (inches) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.21 0.25 0.29 0.31 0.33 Hydrograph for Subcatchment 33S: H -Bypass Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.12 29.97 5.09 3.47 2.67 2.28 Time Precip. Excess (hours) (inches) (inches) 13.25 2.12 0.35 13.50 2J6 0.38 13.75 2.19 0.37 14.00 2.21 0.39 14.25 2.24 0,40 14.50 2.26 0.41 14.75 2.28 0.42 15.00 2.30 0.43 15.25 2.32 0.44 15.50 2.34 0.45 15.75 2.36 0.48 16.80 2.38 0.47 18.25 2.39 0.47 18.50 2.41 0.48 16.75 2.42 0.49 17.00 2.43 0.50 17.25 245 0.50 17.50 2.46 0.51 17.75 2.47 0.52 18.00 2.49 0.52 18.25 2.50 0.53 18.60 2.51 0.53 18.75 2.52 0.54 19.00 2.53 0.65 19.25 2.54 0.55 19.50 2.55 0.58 19.75 2.56 0.56 20.00 2.57 0.57 20.25 2.58 0.57 20.50 2.59 0.57 20.75 2.60 0.58 21.00 2.60 0.58 21.25 2.61 0.59 21.50 2.62 0.59 21.75 2.63 0.80 22.00 2.64 0.80 22.25 2.65 0.61 22.50 2.65 0.81 22.75 2.66 0.61 23.00 2.67 0.62 23.25 2.68 0.62 23.50 2.68 0.83 23.75 2.69 0.83 24.00 2.70 0.64 Runoff (cfs) 2.01 1.79 1.61 1.44 1.35 1.30 1.24 1.19 1.13 1.07 1.00 0.94 0.91 0.89 0.87 0.84 0.82 0.80 0.78 0.76 0.73 0.71 0.69 0.66 0.64 0.61 0.59 0.56 0.55 0.55 0.54 0.54 0.54 0.53 0.53 0.52 0.52 0.52 0.51 0.51 0.50 0.50 0.49 0.49 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 8 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 316/2007 Pond 37P: Pond H Inflow Area = 182.359 ac, Inflow Depth > 0.55" for 100 Year event Inflow = 79.06 cfs @ 12.22 hrs, Volume= 8.337 af Outflow = 56.31 cfs @ 12.40 hrs, Volume= 8.190 af, Atten= 29%, Lag= 10.5 min Primary = 56.31 cfs @ 12.40 hrs, Volume= 8.190 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 7,422.96' © 12.40 hrs Surf.Area= 0.378 ac Storage= 1.052 af Plug -Flow detention time= 21.5 min calculated for 8.173 af (98% of inflow) Center -of -Mass det. time= 12.1 min ( 911.4 - 899.3 ) Volume Invert Avail.Storage Storage Description #1 7,419.00' 1.468 af Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre-feet) (acre-feet) 7,419.00 0.000 0.000 0.000 7,420.00 0.243 0.122 0.122 7,421.00 0.296 0.270 0.391 7,422.00 0.337 0.317 0.707 7,423.00 0.380 0.358 1.066 7,424.00 0.425 0.403 1.468 Device Routing Invert Outlet Devices #1 Primary 7,419.00' 42.0" x 50.0' long Culvert RCP, sq.cut end projecting, Ke= 0.500 Outlet Invert= 7,418.55' S= 0.0090 '1' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections #2 Device 1 7,419.50' 40.0" Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=56.31 cfs @ 12.40 hrs HW=7,422.96' (Free Discharge) L1Culvert (Passes 56.31 cfs of 63.80 cfs potential flow) 2=Orifice/Grate (Orifice Controls 56.31 cfs @ 6.45 fps) Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Type II 24 -hr 100 Year Rainfall=2.70" Page 9 3/6/2007 Pond 37P: Pond H Hydrograph 85- 80 75 70 65 60- 55 50-; u .~ 45- X IT 40_ Elevation (feet) 5 3o. 25- 20 15- 10- 79.06 cis Inflow 5-10- Inflow Area=182.359 ac Peak Elev=7,422.96' Storage=1.052 of 156 31 cfs 0�}... ., ...�.. .. �. .. .... �.,... .. ,. .. .. ..Tr1. .., 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 7,424 Pond 37P: Pond H Stage -Discharge 7,423 7,422- 7,421- 7,4 7,419 . 0 5 10 • 15 20 25 30 35 40 45 50 55 60 65 70 Discharge (cfs) — Inflow — Primary — Primary Post -Development Prepared by Gamba & Associates, Inc. HydroCADO 8.00 sin 004370 C 2006 HydroCAD Software Solutions LLC Type 1124 -hr 100 Year Rainfa11=2, 70„ Page 10 3/612007 0 7,424 - 7,423- m 7,422- 4 c 6 w 7,421- 7,420-, ,421- 7,420 7,419 Pond 37P: Pond H Stage -Area -Storage Surface/Horizontal/Wetted Area (acres) 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 Storage (acre-feet) — Surface — Storage 1 1 1 Post -Development Type 824-hrf00 Year Rainfall=2.70" Page bV(�8[Ob8��Associates, Inc. P��e 11 HydroCAD@)8.00 o/n0O437U 6D2OO8HydnoCADSoftware Solutions LLC 3/6/2007 Hydrograph for Pond 37P: Pond H Time Inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet)h:�) �� 0.00 0.00 0]300 7,419.000l0 0.50 0.00 0.000 7.418.00 0.00 1.00 0.00 0.000 7.419.00 0.00 I 1.50 0.00 0.000 7.419.00 0.00 2.00 0.00 0.080 7.419.00 0.80 2.60 0.80 0.000 7.418.00 0.00 3.00 0.00 0.000 7.419.00 0.00 I 3.5O O.00 O�O00 7,41Q.00 O.08 4.00 0.08 0.000 7`419.00 0.00 4.50 0.00 8.008 7.419.00 0.00 5.00 0.00 0.000 7.419.00 0.00 I8.5O 0.00 0.000 7,419.00 0.00 6.00 0.00 0.000 7.410.00 0.00 8.50 0.00 8.000 7.419.00 0.00 I 7.00 0.00 0.000 7.418.00 0.00 7.50 0.00 0.000 7.419.00 0.00 8.00 0.00 0.000 7.419,00 0.00 8.50 0.00 0.000 7.419.00 0.00 I9.00 0.00 0.000 7.419.00 0.00 8.50 0.00 0.000 7'419.00 0.00 10.00 0.00 0.000 7.419.00 0.80 10.50 0.00 0.000 7.418.00 0.00 I11.0O 0.00 0.000 7,419.00 0.00 11.50 0.00 0.000 7.418.08 0.08 12.00 23.32 O.1�3 7,420.01 2.04 I 12.50 42.12 0�S� 7,4��.8i 54.O2 13.00 17.O1 0.504 7,421.37 23.53 13.50 11.65 0.354 7,420.87 13.55 14.00 9.25 0.299 7,420.68 10.24 I 14.SO 7�74 O�385 7.42D.58 8.34 15.00 7.08 0.248 7.420.49 7.39 16.50 6.42 0.235 7.430.44 6.73 16.00 5.74 0.222 7.420.39 6.07 I ����O 5�1B D.20G 7.42U�34 5.44 17.00 4.92 0.200 7,420.31 5.07 17.50 4.69 0.196 7.420.29 4.82 18.00 4.44 8.189 7'420.27 4.57 U 18.50 4.19 0.184 7,420.25 4.33 19.00 3.93 0.178 7.420.23 4.07 19.50 3.660.172 7.420.20 3.81 I 20.00 3.38 0.165 7.420.18 3.54 20.50 3.17 0.159 7,420.15 3.29 21.00 3.11 0.155 7,420.14 3.16 21.50 3.06 0.153 7.420.13 3.10 I 22.00 3.02 0.152 7,420.12 3.05 22.50 2.97 0.161 7.420.12 3.00 33.00 2.93 0.160 7'420.11 2.96 23.50 2.88 0.149 7,420.11 2.91 I24.00 2.83 0.147 7,420.10 2.86 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 12 HydroCAD® 8.00 s/n 004370 CI 2006 HydroCAD Software Solutions LLC 3/6/2007 Stage -Discharge for Pond 37P: Pond H Elevation Primary Elevation Primary (feet) (cfs) (feet) (cfs) 7,419.00 0.00 7,421.65 29.71 7,419.05 0.00 7,421.70 30.86 7,419.10 0.00 7,421.75 32.01 7,419.15 0.00 7,421.80 33.16 7,419.20 0.00 7,421.85 34.32 7,419.25 0.00 7,421.90 35.48 7,419.30 0.00 7,421.95 36.64 7,419.35 0.00 7,422.00 37.79 7,419.40 0.00 7,422.05 38.95 7,419.45 0.00 7,422.10 40.09 7,419.50 0.00 7,422.15 41.23 7,419.55 0.02 7,422,20 42.36 7,419.60 0.08 7,422.25 43.48 7,419.65 0.18 7,422.30 44.58 7,419.70 0.33 7,422.35 45.67 7,419.75 0.51 7,422.40 46.73 7,419.80 0.73 7,422.45 47.77 7,419.85 0.98 7,422.50 48.78 7,419.90 1.28 7,422.55 49.76 7,419.95 1.61 7,422.60 50.70 7,420.00 1.98 7,422.65 51.60 7,420.05 2.38 7,422.70 52.44 7,420.10 2.82 7,422.75 53.21 7,420.15 3.29 7,422.80 53.88 7,420.20 3.79 7,422.85 54.52 7,420.25 4.33 7,422.90 55.32 7,420.30 4.90 7,422.95 56.11 7,420.35 5.51 7,423.00 56.89 7,420.40 6.14 7,423.05 57.66 7,420.45 6.80 7,423.10 58.42 7,420.50 7.50 7,423.15 59.18 7,420.55 8.22 7,423.20 59.92 7,420.60 8.97 7,423.25 60.65 7,420.65 9.75 7,423.30 61.37 7,420.70 10.55 7,423.35 62.09 7,420.75 11.38 7,423.40 62.79 7,420.80 12.23 7,423.45 63.49 7,420.85 13.11 7,423.50 64.18 7,420.90 14.01 7,423.55 64.87 7,420.95 14.94 7,423.60 65.55 7,421.00 15.88 7,423.65 66.22 7,421.05 16.85 7,423.70 66.88 7,421.10 17.83 7,423.75 67.54 7,421.15 18.84 7,423.80 68.19 7,421.20 19.86 7,423.85 68.83 7,421.25 20.90 7,423.90 69.47 7,421.30 21.96 7,423.95 70.10 7,421.35 23.03 7,424.00 70.73 7,421.40 24.12 7,421.45 25.21 7,421.50 26.32 7,421.55 27.44 7,421,60 28.57 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type ll 24 -hr 100 Year Rainfall -2.70" Prepared by Gamba & Associates, Inc. Page 13 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/612007 Stage -Area -Storage for Pond 37P: Pond H Elevation Surface Storage (feel) (acres) (acre-feet) 7,419.00 7,419.05 7,419.10 7,419.15 7,419.20 7,419.25 7,419.30 7,419.35 7,419.40 7,419.45 7,419.50 7,419.55 7,419.60 7,419.65 7,419.70 7,419.75 7,419.80 7,419.85 7,419.90 7,419.95 7,420.00 7,420.05 7,420.10 7,420.15 7,420.20 7,420.25 7,420.30 7,420.35 7,420.40 7,420.45 7,420.50 7,420.55 7,420.60 7,420.65 7,420,70 7,420.75 7,420.80 7,420.85 7,420.90 7,420.95 7,421.00 7,421.05 7,421.10 7,421.15 7,421.20 7,421.25 7,421.30 7,421.35 7,421.40 7,421.45 7,421.50 7,421.55 7,421.60 0.000 0.012 0.024 0.036 0.049 0.061 0.073 0.085 0,097 0.109 0.122 0.134 0.146 0.158 0.170 0.182 0.194 0.207 0.219 0.231 0.243 0.246 0.248 0.251 0.254 0.256 0.259 0.262 0.264 0.267 0.270 0.272 0.275 0.277 0.280 0.283 0.285 0.288 0.291 0.293 0.296 0.298 0.300 0.302 0.304 0.306 0.308 0.310 0.312 0.314 0.317 0.319 0.321 0.000 0.000 0.001 0.003 0.005 0.008 0.011 0.015 0.019 0.025 0.030 0.037 0.044 0.051 0.060 0.068 0.078 0.088 0.098 0.110 0.122 0.134 0.146 0.159 0.171 0.184 0.197 0.210 0.223 0.236 0.250 0.263 0.277 0.291 0.305 0.319 0.333 0.347 0.362 0.376 0.391 0.406 0.421 0.436 0.451 0.466 0.482 0.497 0.513 0.528 0.544 0.560 0.576 Elevation Surface Storage (feet) (acres) (acre-feet) 7,421.65 0.323 7,421.70 0.325 7,421.75 0.327 7,421.80 0.329 7,421.85 0.331 7,421.90 0.333 7,421.95 0.335 7,422.00 0.337 7,422.05 0.339 7,422.10 0.341 7,422.15 0.343 7,422.20 0.346 7,422.25 0.348 7,422.30 0.350 7,422.35 0.352 7,422.40 0.354 7,422.45 0.356 7,422.50 0.358 7,422.55 0.361 7,422.60 0.363 7,422.65 0.365 7,422.70 0.367 7,422.75 0.369 7,422.80 0.371 7,422.85 0.374 7,422.90 0.376 7,422.95 0.378 7,423.00 0.380 7,423.05 0.382 7,423.10 0.385 7,423.15 0.387 7,423.20 0.389 7,423.25 0.391 7,423.30 0.394 7,423.35 0.396 7,423.40 0.398 7,423.45 0.400 7,423.50 0.403 7,423.55 0.405 7,423.60 0.407 7,423.65 0.409 7,423.70 0.411 7,423.75 0.414 7,423.80 0.416 7,423.85 0.418 7,423.90 0.420 7,423.95 0.423 7,424.00 0.425 0.592 0.608 0.625 0.641 0.657 0.674 0.691 0.707 0.724 0.741 0.759 0.776 0.793 0.811 0.828 0.846 0.864 0.881 0.899 0.917 0.936 0.954 0.972 0.991 1.009 1.028 1.047 1.066 1.085 1.104 1.124 1.143 1.162 1.182 1.202 1.222 1.242 1.262 1.282 1.302 1.323 1.343 1.364 1.384 1.405 1.426 1.447 1.468 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 14 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Link 34L: H -Outfall Inflow Area = 211.884 ac, Inflow Depth > 0.55" for 100 Year event Inflow = 60.50 cfs cx 12.39 hrs, Volume= 9.752 af Primary = 60.50 cfs @ 12.39 hrs, Volume= 9.752 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs 6 6 5 5: 4 4� 3 0 Z 3i Link 34L: H -Outfall Hyd rog raph 25 20 1: 11 l 60,50 cfs 1 Inflow Area=211.884 ac 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Inflow — Primary 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. Hyd.CADO 8.00sin 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 15 3/6/2007 Time (hours) 0.00 0.25 0.50 N� 0.75 1.00 1.25 1.50 1.75 m� 2.00 2.25 2.50 2.75 3.00 3.25 3.50 ~- 3.75 4.00 14.25 4.5O 4.75 5.00 5.25 5.50 5.75 6.00 6.25 N� 6.50 6.75 7.00 N� 7.25 7.50 7.75 8.00 N� 8.25 8.50 8.75 9.00 9.25 9.50 9.75 N� 10.00 ~~ 10.25 10.50 10.75 N� 11.00 11.25 11.50 11.75 12.00 12.25 12.50 N� 12.75 13.00 1 Inflow Elevation (cfs) (feet) 0.00 OA:18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.12 32.01 53.41 57.49 40.01 25.81 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Hydrograph for Link 34L: H -Outfall Primary Time (cfs) (hours) 0.00 13.25 0.00 13.50 0.00 13.75 0.00 14.00 0.00 14.25 0.00 14.50 0.00 14.75 0.00 15.00 0.00 15.25 0_0O 15.50 0.00 15.75 0.00 16.00 0.00 16.25 0.00 16.50 0.00 16.75 0.00 17.00 0,00 17.25 0.00 17.50 0.00 17.75 0.00 18.00 0.00 18.25 0.00 18.50 0.00 18.75 0.00 19.00 0.00 19.25 0.00 19.50 0.00 19.75 0.00 20.00 0.00 20.25 0.00 20.50 0.00 20.75 0.00 21.00 0.00 21.25 0.00 21.50 0.00 21.75 0.00 22.00 0.00 22.25 0.00 22.50 0.00 22.75 0.00 23.00 0.00 23.25 0.00 23.50 0.00 23.75 0.00 24.00 0.00 0.00 0.00 3.12 32.01 53.41 57.49 40.01 25.81 Inflow (cfs) 18.96 15.34 13.22 11.69 10.S2 9_64 9.04 8.58 818 7.80 7.41 7.01 6.65 6.33 6.09 5.91 5.76 5.62 5.47 S.33 5.18 5.04 4.89 4.74 4.58 4.42 4.27 4.11 3.96 3.84 3.76 3.70 3.66 3.63 3.60 3.57 3.55 3.52 3.49 3.46 3.44 3.41 3.38 3.35 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 O.00 0.00 0.00 0.00 0.00 D.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 18.96 15.34 13.22 11.69 10.52 9.64 9.04 8.58 8.18 7.80 7.41 7.01 6.65 6.33 6.09 5.91 5.76 5.62 5.47 5.33 5.18 5.04 4.89 474 4.58 4.42 4.27 4.11 3.96 3.84 3.76 3.70 3.66 3.63 3.60 3.57 3.55 3.52 3.49 3.46 3.44 3.41 3.38 3.35 Reach 9S Area I PRE Link Drainage Diagram for Pre -Development Prepared by Garnba & Associates, inc. 3/6/2447 HydroCAD® 8,00 sin 004370 C`32006 HydroCAD Software Solutions LLC Pre -Development Prepared by Garnba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Page 2 316/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 8.790 56 Brush, Fair, HSG B (9S) 108.190 70 Brush, Fair, HSG C (9S) 116.9801 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Type 11 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=5.00-24.00 hrs, dt=0.05 hrs, 381 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 9S: Area 1 Runoff Area 116.980 ac Runoff Depth>0.51" Flow Length=1,728' Tc=34.3 min CN=69 Runoff=36.36 cfs 4.954 af Total Runoff Area = 116.980 ac Runoff Volume = 4.954 af Average Runoff Depth = 0.51" 100.00% Pervious Area = 116.980 ac 0.00% Impervious Area = 0.000 ac Pre -Development Prepared by Garnba & Associates, Inc, HydroCAD® 8.00 sin 004370 G 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 YEAR Rainfall=2.70" Page 4 3/612007 Subcatchment 9S: Area 1 Runoff = 36.36 cfs @ 12.36 hrs, Volume= 4.954 af, Depths 0.51" Runoff by SCS TR -20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type 11 24 -hr 100 YEAR Rainfall=2.70" Area ac CN Descri.tion 8.790 108.190 116.980 116.980 56 Brush, Fair, HSG B 70 Brush, Fair, HSG C 69 Weighted Average Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 30.7 100 0.0091 0.05 Sheet Flow, Grass: Dense n= 0.240 P2= 1.30" 3.6 1,628 0.2166 7.49 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 34.3 1,728 Total Subcatchment 9S: Area 1 Hydrograph 40 38-7 36- 34 32= 30=. 28= 26 24= 22 20 18- 16 14' 12 10- 8-, 6 23, 36.36 cfs. 1 Type 11 24-hr 100 YEAR Rainfall=2.70" Runoff Area=116.980 ac Runoff Volume=4.954 af Runoff Depth>0.51" Flow Length=1,728' Tc=34.3 min CN=69 5 6 7 8 9 10 11 12 13 14 15 16 17 Time (hours) 18 19 20 21 22 23 24 — Runoff Pre -Development Prepared by Gamba & Associates, Inc. HydroCADD 8.00 sin 004370 © 2006 HydroCAD Software Solutions Time Preop. (hours) (inches) 5.00 0.17 5.25 0.18 5.50 5.75 6,00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8,75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 2.12 2.16 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2.43 2.45 2.40 2.47 2.49 Excess (inches) 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.15 0.18 0.21 0.23 0.25 0.26 0.28 0.29 0.30 0.31 0.32 0.33 0.34 0.34 8.35 0.36 0.37 0.37 0.38 0.39 0.39 0.40 0.40 0.41 0.41 Type 11 24 -hr 100 YEAR Rainfal1=2.70" Page 5 LLC 3/6/2007 Hydrograph forSubcatchr0ent 9S: Area 1 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4.87 32.28 31.72 19.50 13.05 8.79 7.99 6.85 6.03 5.40 4.94 4.64 4.43 4.23 4.03 3.83 3.63 3.42 3.25 3.14 3.06 2.98 2.91 2.84 2.76 Time (hours) 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess (inches) 0.42 0.43 0.43 0.44 0.44 0.44 0.45 0.45 0.46 D.40 0.47 0.47 0.47 0.48 0.48 0.49 0.49 0.49 0.50 0.50 0.50 0.51 0.51 0.52 Runoff (cfs) 2.69 2.61 2.53 2.45 2.37 2.29 2.21 2.12 2.04 1.97 1.94 1.92 1.91 1.89 1.88 1.87 1.85 1 84 1.82 1.81 1.79 1.78 1.77 1.75 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 4bca> Reach 14S Area -I Link Drainage Diagram for Post -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Post -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 8.789 56 Brush, Fair, HSG B (14S) 97.783 TO Brush, Fair, HSG C (14S) 0.723 74 >75% Grass cover, Good, HSG C (14S) 2.820 98 Paved parking & roofs (14S) 110.115 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 sin 004370 Q 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=0.00424.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 14S: Area -1 Runoff Area=110.115 ac Runoff Depth>0.55" Flow Length=1,728' Tc=34.3 min CN=70 Runoff= -38.07 cfs 5.014 af Total Runoff Area = 110.115 ac Runoff Volume = 5.014 af Average Runoff Depth = 0.55" 97.44% Pervious Area = 107.295 ac 2.56% Impervious Area = 2.820 ac Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc, Page 4 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 316/2007 Subcatchment 14S: Area -I MITIGATE THROUGH ONLOT DETENTION Runoff = 38.07 cfs @ 12.35 hrs, Volume= 5.014 af, Depth> 0.55" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 8.789 56 Brush, Fair, HSG B 97.783 70 Brush, Fair, HSG C 0,723 74 >75% Grass cover, Good, HSG C 2.820 98 Paved parking & roofs 110.115 70 Weighted Average 107.295 Pervious Area 2.820 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ft/sec) (cfs) 30.7 100 0.0091 0.05 3.6 1,628 0.2166 Sheet Flow, Grass: Dense n= 0.240 P2= 1.30" 7.49 Shallow Concentrated Flow, Unsaved Kv= 16.1 f 34.3 1,728 Total Subcatchment 14S: Area -I Hydrograph 42 40 34 32- 30 28 26 24 22' a 20- a 18- 16' 14 12 10- 8 4-1 Type I124 -hr 100 Year Rainfall=2.70" Runoff Area=110.115 ac Runoff Volume=5.014 af Runoff Depth>0.55" Flow Length=1,728' Tc=34.3 min CN=70 0 1 2 3 4 38.47 cfs 1 _1. 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — lug {)1f Post -Development Prepared by Gamba & Associates, Inc. HydroCA[xO8.DO sin 004370 © 2006 HydroCAD Software Solutions LLC 7yne11 24 -hr 100 Year Ra/nfal1=2.70" Page 5 3/6/2007 Time pours) 0.00 0,25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 Pnecp. (inches) 0.00 0.01 0.01 0.02 0.03 0.04 0.04 0.05 0.06 0.07 0.08 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0,52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 Excess (inches) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.17 0.21 0.23 0.26 0.27 Hydrograph for Subcatchment 145: Area -I Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 OOO 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 5.74 34.26 32.81 19.88 13.17 Time (hours) 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.12 2.16 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2.43 2.45 2.46 2.47 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess (inches) 0.29 0.30 0,32 0.33 0.34 0.35 0.36 0.37 0.37 0.38 0.39 0.40 0.40 0.41 0.42 0.42 0.43 0.44 0.44 0.45 0.45 0.46 0.47 0.47 0.48 0.48 0.48 0.49 0.49 0.50 0.50 0.51 0.51 0.51 0,52 0.52 0.53 0.53 0.53 0.54 0.54 0.55 0.55 0.55 Runoff (cf ) 9.81 7.98 6.82 5.99 5.36 4.89 4.60 4.38 4.18 3.99 3.79 3.58 3.38 3.21 3.10 3.O2 2.94 2.87 2.80 2.72 2.65 2.57 2.49 2.42 2.34 2.25 2.17 2.09 2.01 1.94 1.91 1.89 1.87 1.86 1.85 1.83 1.82 1.80 1.79 1.78 1.76 1.75 1.73 1.72 4tb4 Reach 32S Area J1 PRE Link Drainage Diagram for Pre -Development Prepared by Garnba & Associates. Inc. 3/6/2007 HydroCAM 8,00 sin 004370 © 2006 HydroCA[7 Software Solutions LLC Pre -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 577.059 57 Oak/aspen range, Fair, HSG C (32S) 43.629 58 Meadow, non -grazed, HSG B (32S) 15.067 63 Sagebrush range, Fair, HSG C (32S) 11.841 66 Oak/aspen range, Poor, HSG B (32S) 201.719 66 Woods, Poor, HSG B (32S) 568.845 70 Brush, Fair, HSG C (32S) 82.593 71 Meadow, non -grazed, HSG C (32S) 272.143 77 Woods, Poor, HSG C (32S) 1,772.896 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Type 11 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCADC 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 316/2007 Time span =5.00-24.00 hrs, dt=0.05 hrs, 381 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 32S: Area J1 Runoff Area=1,772.896 ac Runoff Depth>0.39" Flow Length=2.4,815' Tc=105.1 rain CN=66 Runoff=176.97 cfs 57.270 af Total Runoff Area = 1,772.896 ac Runoff Volume = 57.270 af Average Runoff Depth = 0.39" 100.00% Pervious Area = 1,772.896 ac 0.00% Impervious Area = 0.000 ac Pre -Development Type 11 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 4 HydroCAD® 8.00 sin 004370 02006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 32S: Area J1 Runoff 176.97 cfs @ 13.46 hrs, Volume= 57.270 af, Depths 0.39" Runoff by SCS TR -20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 YEAR Rainfall=2.70" Area (ac) CN Description 11.841 66 Oak/aspen range, Poor, HSG B 577.059 57 Oak/aspen range, Fair, HSG C 568.845 70 Brush, Fair, HSG C 15.067 63 Sagebrush range, Fair, HSG C 43.629 58 Meadow, non -grazed, HSG B 82.593 71 Meadow, non -grazed, HSG C 272.143 77 Woods, Poor, HSG C 201.719 66 Woods, Poor, HSG B 1,772.896 66 Weighted Average 1,772.896 Pervious Area Tc Length Slope Velocity Capacity Description (min} (feet) (ftlft) (ftlsec) (cfs} 33.7 100 0.0200 0.05 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 27.0 4,512 0.0300 2.79 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 44.4 20,203 0.1086 7.59 49.34 Channel Flow, Area= 6.5 sf Perim= 20.5' r= 0.32' n---• 0.030 105.1 24,815 Total 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Type 1/ 24 -hr 100 YEAR Rainfaf1=2.70" Prepared by Gamba & Associates, Inc. Page 5 HydroCAD® 8.00 sin 004370 C7 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 32S: Area J1 Hydrograph 190-1 180; 170- 160- 1601 70=160-150: 140- 130- 120- 110 40-130-120-110 100- 90= u. 80- 70- 60- 50 0-70-6050 40 30 20 10 0 176.97 ifs I Type I124 -hr 100 YEAR Rainfall=2.70" Runoff Area=1,772.896 ac Runoff Volume=57.270 of Runoff Depth>0.39" Flow Length=24,815" Tc=105.1 min CN=66 5 6 7 8 9 10 11 12 13 14 15 r 16 17 18 19 20 21 Time (hours) 22 23 24 — Rurno Pre -Development Prepared by Gamba & Associates, Inc. HydnnCAOO8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 YEAR /98infall=2.70" Page 6 3/612007 Time (hours) 5.00 5.25 5.50 5.75 6.00 6.25 6.50 675 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 1075 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 Precip. (inches) 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0,40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 2.12 2.16 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2.43 2.45 2.46 2.47 2.49 Excess (inches) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.13 0.15 0.17 0.18 0.19 0.20 0.21 0.22 0.23 0.24 0.25 0.25 0.26 0.27 0.27 0.28 0.28 0.29 0.30 0.30 0.31 0.31 0.32 0.32 Hydrograph for Subcatchment 32S: Area J1 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.40 13.11 44.30 94.19 141.85 169.60 176.49 166.41 146.88 128.23 113.22 100.52 89.80 81.07 73.95 68.16 63.42 59.36 55.73 52.45 49.57 47.05 44.85 42.92 41.33 Time (hours) 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess (inches) 0.33 0.33 0.33 0.34 0.34 0.35 0.35 0.35 0.36 0.36 0.37 0.37 0.37 0.38 0.38 0.38 0.39 0.39 0.39 0.40 0.40 0.40 0.41 0.41 Runoff (cfs) 40.02 38.84 37.74 36.68 35.65 34.62 33.58 32.54 31.48 30.43 29.39 28.44 27.61 26.93 26.39 25.96 25.62 25.33 25.08 24.85 24.63 24.43 24.23 24.03 subcaj) <62S> Are J-1 U /79S\ 65 P Area J-1-byps opkir�s-Res Reach Link 42 L J-3 Outfall Drainage Diagram for Post -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Post -Development Prepared by Garnba & Associates, Inc. Page 2 HydroCADC 8.00 sin 004370 © 2006 HydroCA❑ Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 546.800 57 Oaklaspen range, Fair, HSG C (62S,79S) 42.414 58 Meadow, non -grazed, HSG B (62S) 274.028 60 Woods, Fair, HSG B (625) 0.275 61 >75% Grass cover, Good, HSG B (62S) 5.662 63 Sagebrush range, Fair, HSG C (79S) 531.673 70 Brush, Fair, HSG C (79S) 29.193 71 Meadow, non -grazed, HSG C (62S,79S) 211.156 73 Woods, Fair, HSG C (62S) 4.940 74 >75% Grass cover, Good, HSG C (62S,79S) 41.328 76 Woods/grass comb., Fair, HSG C (79S) 90.189 98 Paved parking & roofs (625,795) 1,777.658 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Star -Ind method Subcatchment 62S: Area J-1 Runoff Area=747.437 ac Runoff Depth>0.33" Flow Length=9,593' Tc=65.3 min CN=64 Runoff=79,69 cfs 20/36 af Subcatchment 79S: Area J -1 -bypass Runoff Area=1,030,221 ac Runoff Depth>0.43" Flow Length=16,165" Tc=58.1 min CN=67 Runoff=175.49 cfs 37.004 af Pond 65P: Hopkins -Res Peak EIev=9,001.17" Storage=17,117 af inflow=79.69 cfs 20.736 af Outflow=5.57 cfs 3.613 af Link 42L: J-3 Outfall Inflow=175.69 cfs 40.617 af Primary=175.69 cfs 40.617 af Total Runoff Area = 1,777.658 ac Runoff Volume = 57.740 af Average Runoff Depth = 0.39" 94.93% Pervious Area = 1,687.469 ac 5.07% Impervious Area = 90.189 ac Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 4 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 62S: Area J-1 Runoff = 79.69 cfs @ 12.88 hrs, Volume= 20.736 af, Depth> 0.33" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type 1124 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 176.154 57 Oak/aspen range, Fair, HSG C 42.414 58 Meadow, non -grazed, HSG B 23.003 71 Meadow, non -grazed, HSG C 274.028 60 Woods, Fair, HSG B 211.156 73 Woods, Fair, HSG C 0.275 61 >75% Grass cover, Good, HSG B 0.826 74 >75% Grass cover, Good, HSG C 19.581 98 Paved parking & roofs 747.437 64 Weighted Average 727.856 Pervious Area 19.581 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 33.7 100 0.0200 0.05 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 27.0 4,512 0.0300 2.79 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 4.6 4,981 0.0587 18.09 759.65 Channel Flow, Area= 42.0 sf Perim= 22.7' r= 1.85' n= 0.030 65.3 9,593 Total Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.747" Page 5 3/6/2007 Subcatchment 62S: Area J-1 Hydrograph 85 80 75-- 70 65 60 55- 50 45 40 35 30 25 20- 15 10-= Type 1124 -hr 100 Year Rainfall=2.70" Runoff Area=747.437 ac Runoff Volurne=20.736 of Runoff Depth>0.33" Flow Length=9,593' Tc=65.3 min CN=64 2 3 4 5 6 7 8 9 10 11 12 13 14 Time (hours) 15 16 17 18 19 20 21 22 23 24 — Runoff Post -Development Prepared by Gamba & Associates, Inc. HydroCADQ 8.00 sin 004370 4 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 6 3/612007 Time (hours) 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 Precip. (inches) 0.00 0.01 0.01 0.02 0.03 0.04 0.04 0.05 0.06 0.07 0.08 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 Excess (inches) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.07 0.10 0.11 0.13 0.14 Hydrograph for Subcatchrnent 62S: Area J-1 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.21 16.24 51.65 76.21 77.89 Time (hours) 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.12 2.16 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2.43 2.45 2.46 2.47 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess (inches) 0.15 0.16 0.17 0.18 0.18 0.19 0.20 0.20 0.21 0.22 0.22 0.23 0.23 0.24 0.24 0.25 0.25 0.26 0.26 0.27 0.27 0.27 0.28 0.28 0.29 0.29 0.29 0.30 0.30 0.30 0.31 0.31 0.31 0.31 0.32 0.32 0.32 0.33 0.33 0.33 0.34 0.34 0.34 0.34 Runoff (cfs) 64.90 53.38 44.83 38.45 33.48 29.63 26.70 24.51 22.90 21.57 20.44 19.43 18.45 17.52 16.69 16.00 15.48 15.06 14.68 14.30 13.96 13.61 13.25 12.88 12.52 12.14 11.75 11.36 10.96 10.57 10.23 9.98 9.81 9.69 9.59 9.52 9.45 9.38 9.32 9.26 9.19 9.12 9.07 9.00 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 7 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/612007 Subcatchment 79S: Area J -1 -bypass Runoff = 175.49 cfs @ 12.73 hrs, Volume= 37.004 af, Depth> 0.43" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type 1124 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 370.646 57 Oak/aspen range, Fair, HSG C 531.673 70 Brush, Fair, HSG C 5.662 63 Sagebrush range, Fair, HSG C 6.190 71 Meadow, non -grazed, HSG C 41.328 76 Woods/grass comb., Fair, HSG C 4.114 74 >75% Grass cover, Good, HSG C 70.608 98 Paved parking & roofs 1,030.221 67 Weighted Average 959.613 Pervious Area 70.608 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ft/sec) (cfs) 23.9 100 0.0472 0.07 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 0.1 79 0.4095 10.30 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 13.2 7,198 0.1550 9.07 58.94 Channel Flow, Area= 6.5 sf Perim= 20.5' r= 0.32' n= 0.030 1.2 773 0.0568 10.91 87.31 Channel Flow, Area= 8.0 sf Perim= 9.0' r= 0.89' n= 0.030 19.7 8,015 0.0864 6.77 44.01 Channel Flow, Area= 6.5 sf Perim= 20.5' r= 0.32' n= 0.030 58.1 16,165 Total Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Garnba & Associates, Inc. Page 8 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/8/2007 3 0 LL Subcatchment 79S: Area J -1 -bypass Hydrograph 190:, 180- 170: 160- 1503 1403 130. 120 110 100 9o= 802 70- 60- 50= 40= 30= 20 103 0' 0 Type II 24 -hr 100 Year Rainfall=2.70" Runoff Area=1,030.221 ac Runoff Volume=37.004 of Runoff Depth>0.43" Flow Length=1 G,1 G5' Tc=58.1 min CN=67 1175.49 cfs j 11\111 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff Post -Development Prepared by Gamba & Associates, Inc. HydroCAOO8.OU s/n 004370 © 2006 HydroCAD Software Solutions LLC 7ype1/24-hyY00Year Rain/a8=2.70" Page 9 3/6/2007 Time (hours) 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 575 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11,00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 Precip. (inches) 0.00 0.01 0.01 0.02 0.03 0.04 0.04 0.05 0.06 0.07 0.08 0.08 0.09 0.10 0,11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.83 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 Hydrograph for Subcatchment 79S: Area J -1 -bypass Excess (inches) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.11 0.15 0.17 0.19 0.20 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.57 55.98 145.72 175.31 148.53 Time (hours) 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.12 2.16 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2.43 2.45 2.46 2.47 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess (inches) 0.21 0.23 0.24 0.25 0.25 0.26 0.27 0.28 0.29 0.29 0.30 0.31 0.31 0.32 0.32 0.33 0.34 0.34 0.35 0.35 0.36 0.36 0.37 0.37 0.37 0.38 0.38 0.39 0.39 0.39 0.40 0.40 0.40 0.41 0.41 0.42 0.42 0.42 0.43 0.43 0.43 0.44 0.44 0.44 Runoff (cfs) 113.00 89,40 73.19 61.73 53.43 47.07 42.43 39.03 36.41 34.51 32.81 31.18 29.56 28.00 26.67 25.65 24.87 24.19 23.57 22.98 22.38 21.78 21.18 20.56 19.94 19.30 18.66 18.01 1735 16.72 16.21 15.85 15.62 15.45 15.31 15.19 15.07 14.96 14.85 14.74 14.63 14.52 14.40 14.29 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 10 3/6/2007 Inflow Area = Inflow = Outflow = Primary Pond 65P: Hopkins -Res 747.437 ac, Inflow Depth > 0.33" 79.69 cfs @ 12.88 hrs, Volume= 5.57 cfs @ 24.00 hrs, Volume= 5.57 cfs @ 24.00 hrs, Volume= for 100 Year event 20.736 af 3.613 af, Atten= 93%, Lag= 667.2 min 3.613 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 9,001.17' @ 24.00 hrs Surf.Area= 14.962 ac Storage= 17.117 of Plug -Flow detention time= 412.5 min calculated for 3,613 af (17% of inflow) Center -of -Mass det. time= 215.4 min ( 1,172.1 - 956.7 ) Volume Invert Avail,Storage Storage Description #1 9,000.00' 29.734 af Custom Stage Data (Prismatic)Listed below (Recalc) Elevation (feet) 9,000.00 9,002.00 Surf.Area (acres) 14.308 15.426 Device Routing Inc.Store (acre-feet) 0.000 29.734 Invert Cum.Store (acre-feet) 0.000 29.734 Outlet Devices #1 Primary 8,976.00' #2 Device 1 9,000.00' 24.0" x 250.0' long Culvert CMP, square edge headwall, Ke= 0.500 Outlet Invert= 8,956.00' S= 0.0800 '/' Cc= 0.900 n= 0.030 30.0 deg x 1.1' long x 2.00' rise Sharp -Crested Vee/Trap Weir C= 2.61 Primary OutFlow Max=5.57 cfs @ 24.00 hrs HW=9,001.17' (Free Discharge) =Culvert (Passes 5.57 cfs of 38.94 cfs potential flow) 2=Sharp-Crested Vee!Trap Weir (Weir Controls 5.57 cfs @ 3.37 fps) Post -Development Type 11 24 -hr 100 Year Rainfal1=2.70 Prepared by Gamba & Associates, Inc. Page 11 HydroCAD® 8,00 sin 004370 Q 2006 HydroCAD Software Solutions LLC 3/6/2007 Elevation (feet) Pond 65P: Hopkins -Res Hydrog ra ph 85 80- 75 Inflow Area=747.437 ac 70= 65- Peak Elegy=9,001,17' 60 Storage=17.117 of 50- 45 40 35- 30 25 20 15. 10- 5 0 1 179.69 cis 1 — Inflow — Primary —{5.57cis 8 9 10 11 12 13 14 15 16 Time (hours) 7 18 Pond 65P: Hopkins -Res Stage -Discharge 9 20 21 22 23 24 4 • 6....7....8 Discharge jcfsj 10 11 12 13 14 — Primary — Surface — Storage Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 1124 -hr 100 Year Rainfall=2.70" Page 12 3/6/2007 0 2 Pond 65P: Hopkins -Res Stage -Area -Storage SurfaceiHorizont llWetted Area (acres) 5 6 7 8 9 10 11 12 13 14 15 0 2 4 6 10 12 14 16 1$ Storage (acre-feet) 20 22 24 26 28 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 13 HydroCAD® 8.00 sin 004370 ® 2006 HydroCAD Software Solutions LLC 3/6/2007 1 Hydrograph for Pond 65P: Hopkins -Res Time Inflow 0.00 PrimaryI /pours) (cfs) (acre-feet)(feet)(�o) � O.D0 0.000 9.000,00 O.00 0.50 0.00 0.000 9.000.00 0.00 1.00 0.00 0.000 0.000.00 0.00 I1�SO 0.00 0.000 9,000.00 0.00 3.00 0.00 0.000 9.000.00 0.00 2.50 0.00 0.000 9.000.00 0.00 I 3.00 U.80 0.80U Q^U80.0U U.UO 3.50 0.00 0.000 9,000.00 0.00 4.00 0.00 0.000 9.000.00 0.00 4.50 0.00 0.000 9.000.00 0.00 I 5.00 0.00 0.000 9.080.00 0.00 5.50 0.00 0.000 9.000.00 0.00 8.00 0.00 0.000 8.000.00 0.00 0.60 0.00 0.000 0.080.00 0.00 U 7.00 0.00 0.000 9.008,00 0.00 7.50 0.08 0.000 9.000.00 0.00 8.00 0.00 0.000 9.000.00 0.00 8.50 0.00 0.000 9.000.00 0.00 IQ�UO 0.00 0.000 9,000.00 0.00 9.50 0.00 0.000 9`000.08 0.00 10.00 0.00 0.000 9.000.08 0.00 U 1U.50 O.00 U.0OU 9.00D.0U 8.0O 11.00 0.00 0.000 S.QOO.0O 0.00 11.50 0.00 0.000 9'000.00 0.00 12.00 1.21 0.005 9.000.00 0.00 I1�.50 51.65 0.830 9,000.06 0.05 13.00 77.89 3.809 9.000.28 0.51 13.50 53.38 6.475 9.800.45 1.17 14.00 38.45 8.283 9.000.57 1.73 114.50 29.63 9.594 9,000.66 2.18 15.00 24.51 10.804 9'000.73 2.56 15.50 21.57 11.439 9.000.78 2.89 I 16.UO 1O.43 12.16A A.U0O.84 3.1A 16.50 17.52 12.784 9,000.88 3.46 17.00 16.00 13.326 0.000.92 3.70 17.50 18.06 13.809 9.000.95 3.92 I 18.00 14.30 14.349 9.000.98 4.13 18.50 13.61 14.851 8.001.08 4.32 19.00 12.88 15.017 9.001.03 4.50 19.50 12.14 15.345 8.001.05 4.66 I 20.00 11�38 15.635 9,001.07 4.80 20.50 10.57 15.886 0.001.08 4.93 21.00 9.98 16.104 9.001.10 5.04 21.50 8.09 16.298 0.001.11 5.14 I�2.0O 9.52 16.481 9,001.13 5.24 22.50 9.38 16.653 9.001.14 5.33 23.00 9.28 16.816 0.001.15 5.41 I 23.50 8.12 18.871 A.001.10 S.6O 24.00 9.00 17.117 9,001.17 5.57 Post -Development Prepared by Garnba & Associates, Inc. HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Type 1124 -hr 100 Year Rainfall=2.70" Page 14 316/2007 Stage -Discharge for Pond 65P: Hopkins -Res Elevation Primary Elevation Primary Elevation Primary Elevation Primary (feet) (cfs) (feet) (cfs) (feet) (cfs) (feet) (cfs) 9,000.00 0.00 9,000.53 1.53 9,001.06 4.73 9,001.59 9.42 9,000.01 0.00 9,000.54 1.57 9,001.07 4.80 9,001.60 9.53 9,000.02 0.01 9,000.55 1.62 9,001.08 4.88 9,001.61 9.63 9,000.03 0.02 9,000.56 1.67 9,001.09 4.95 9,001.62 9.74 9,000.04 0,03 9,000.57 1.72 9,001.10 5.03 9,001.63 9.84 9,000.05 0.04 9,000.58 1.76 9,001.11 5.10 9,001.64 9.95 9,000.06 0.05 9,000.59 1.81 9,001.12 5.18 9,001.65 10.05 9,000.07 0.07 9,000.60 1.86 9,001.13 5.26 9,001.66 10.16 9,000.08 0.08 9,000.61 1.91 9,001.14 5.34 9,001.67 10.27 9,000.09 0.10 9,000.62 1.96 9,001.15 5.42 9,001.68 10.37 9,000.10 0.12 9,000.63 2.01 9,001.16 5.50 9,001.69 10.48 9,000.11 0.13 9,000.64 2.07 9,001.17 5.58 9,001.70 10.59 9,000.12 0.15 9,000.65 2.12 9,001.18 5.66 9,001.71 10.70 9,000.13 0.17 9,000.66 2.17 9,001.19 5.74 9,001.72 10.81 9,000.14 0.19 9,000.67 2,23 9,001.20 5.82 9,001.73 10.92 9,000.15 0.21 9,000.68 2.28 9,001.21 5.90 9,001.74 11.03 9,000.16 0.24 9,000.69 2.33 9,001.22 5.99 9,001.75 11.14 9,000.17 0.26 9,000.70 2.39 9,001.23 6.07 9,001.76 11.25 9,000.18 0.28 9,000.71 2.44 9,001.24 6.15 9,001.77 11.37 9,000.19 0.31 9,000.72 2.50 9,001.25 6.24 9,001.78 11.48 9,000.20 0.33 9,000.73 2.56 9,001.26 6.32 9,001.79 11.59 9,000.21 0.36 9,000.74 2.61 9,001.27 6.41 9,001.80 11.71 9,000.22 0.39 9,000.75 2.67 9,001.28 6.49 9,001.81 11.82 9,000.23 0.41 9,000.76 2.73 9,001.29 6.58 9,001.82 11.94 9,000.24 0.44 9,000.77 2.79 9,001.30 6.67 9,001.83 12.05 9,000.25 0.47 9,000.78 2.85 9,001.31 6.75 9,001.84 12.17 9,000.26 0.50 9,000.79 2.91 9,001.32 6.84 9,001.85 12.29 9,000.27 0.53 9,000.80 2.97 9,001.33 6.93 9,001.86 12.40 9,000.28 0.56 9,000.81 3.03 9,001.34 7.02 9,001.87 12.52 9,000.29 0.59 9,000.82 3.09 9,001.35 7.11 9,001.88 12.64 9,000.30 0.62 9,000.83 3.15 9,001.36 7.20 9,001.89 12.76 9,000.31 0.66 9,000.84 3.22 9,001.37 7.29 9,001.90 12.88 9,000.32 0.69 9,000.85 3.28 9,001.38 7.38 9,001.91 13.00 9,000.33 0.72 9,000.86 3.34 9,001.39 7.47 9,001.92 13.12 9,000.34 0.76 9,000.87 3.41 9,001.40 7.57 9,001.93 13.24 9,000.35 0.79 9,000.88 3.47 9,001.41 7.66 9,001.94 13.36 9,000.36 0.83 9,000.89 3.54 9,001.42 7.75 9,001.95 13.49 9,000.37 0.87 9,000.90 3.60 9,001.43 7.85 9,001.96 13.61 9,000.38 0.90 9,000.91 3.67 9,001.44 7.94 9,001.97 13.73 9,000.39 0.94 9,000.92 3.73 9,001.45 8.04 9,001.98 13.86 9,000.40 0.98 9,000.93 3.80 9,001.46 8.13 9,001.99 13.98 9,000.41 1.02 9,000.94 3.87 9,001.47 8.23 9,002.00 14.11 9,000.42 1.06 9,000.95 3.94 9,001.48 8.33 9,000.43 1.10 9,000.96 4.01 9,001.49 8.42 9,000.44 1.14 9,000.97 4.08 9,001.50 8.52 9,000.45 1.18 9,000.98 4.15 9,001.51 8.62 9,000.46 1.22 9,000.99 4.22 9,001.52 8.72 9,000.47 1.26 9,001.00 4.29 9,001.53 8.82 9,000.48 1.31 9,001.01 4.36 9,001.54 8.92 9,000.49 1.35 9,001.02 4.43 9,001.55 9.02 9,000.50 1.39 9,001.03 4.50 9,001.56 9.12 9,000.51 1.44 9,001.04 4.58 9,001.57 9.22 9,000.52 1.48 9,001.05 4.65 9,001.58 9.32 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 1124 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 15 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 316/2007 Stage -Area -Storage for Pond 65P: Hopkins -Res Elevation Surface Storage (feet) (acres) (acre-feet) 9,000.00 9,000.02 9,000.04 9,000.06 9,000.08 9,000.10 9,000.12 9,000.14 9,000.16 9,000.18 9,000.20 9,000.22 9,000.24 9,000.26 9,000.28 9,000.30 9,000.32 9,000.34 9,000.36 9,000.38 9,000.40 9,000.42 9,000.44 9,000.46 9,000.48 9,000.50 9,000.52 9,000.54 9,000.56 9,000.58 9,000.60 9,000,62 9,000.64 9,000.66 9,000.68 9,000.70 9,000.72 9,000.74 9,000.76 9,000.78 9,000.80 9,000.82 9,000.84 9,000.86 9,000.88 9,000.90 9,000.92 9,000.94 9,000.96 9,000.98 9,001.00 9,001.02 9,001.04 14.308 14.319 14.330 14.342 14.353 14.364 14.375 14.386 14.397 14.409 14.420 14.431 14.442 14.453 14.465 14.476 14.487 14.498 14.509 14.520 14.532 14.543 14.554 14.565 14.576 14.587 14.599 14.610 14.621 14.632 14.643 14.655 14.666 14.677 14.688 14.699 14.710 14.722 14.733 14.744 14.755 14.766 14.778 14.789 14.800 14.811 14.822 14.833 14.845 14.856 14.867 14.878 14.889 0.000 0.286 0.573 0.859 1.146 1.434 1.721 2.009 2.296 2.584 2.873 3.161 3.450 3.739 4.028 4.318 4.607 4.897 5.187 5.477 5.768 6.059 6.350 6,641 6.932 7.224 7.516 7.808 8.100 8.393 8.685 8.978 9.272 9.565 9.859 10.153 10.447 10.741 11.036 11.330 11.625 11.920 12.216 12.512 12.807 13.104 13.400 13.696 13.993 14.290 14.587 14.885 15.183 Elevation Surface Storage (feet) (acres) (acre-feet) 9,001.06 14.901 9,001.08 14.912 9,001.10 14.923 9,001.12 14.934 9,001.14 14.945 9,001.16 14.956 9,001.18 14.968 9,001.20 14.979 9,001.22 14.990 9,001.24 15.001 9,001.26 15.012 9,001.28 15.024 9,001.30 15.035 9,001.32 15.046 9,001.34 15.057 9,001.36 15.068 9,001.38 15.079 9,001.40 15.091 9,001.42 15.102 9,001.44 15.113 9,001.46 15.124 9,001.48 15.135 9,001.50 15.147 9,001.52 15.158 9,001.54 15.169 9,001.56 15.180 9,001.58 15.191 9,001.60 15.202 9,001.62 15.214 9,001.64 15.225 9,001.66 15.236 9,001.68 15.247 9,001.70 15.258 9,001.72 15.269 9,001.74 15.281 9,001.76 15.292 9,001.78 15.303 9,001.80 15.314 9,001.82 15.325 9,001.84 15.337 9,001.86 15.348 9,001.88 15.359 9,001.90 15.370 9,001.92 15.381 9,001.94 15.392 9,001.96 15.404 9,001.98 15.415 9,002.00 15.426 15.481 15.779 16.077 16.376 16.674 16.973 17.273 17.572 17.872 18.172 18.472 18.772 19.073 19.374 19.675 19.976 20.277 20.579 20.881 21.183 21.485 21.788 22.091 22.394 22.697 23,001 23.304 23.608 23.912 24.217 24.521 24.826 25.131 25.437 25.742 26.048 26.354 26.660 26.966 27.273 27.580 27.887 28.194 28.502 28.809 29.117 29.426 29.734 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 16 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2407 Link 42L: J-3 Outfall Inflow Area = 1,777.658 ac, Inflow Depth > 0,27" for 100 Year event Inflow = 175.69 cfs @ 12.73 hrs, Volume= 40.617 of Primary = 175.69 cfs @ 12.73 hrs, Volume= 40.617 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 42L: J-3 Outfall Hydrog raph 190 180 170= 160 150- 140: 130- 120 110 100-_ 90 80 70 60 Inflow Area=1,777.658 ac 50. 40= 30 20; 10: a; 0 1 2 3 4 175.69 cfs 5 6 7 8 9 10 11 12 13 14 15 16 Time (hours) 17 18 19 20 21 22 23 24 — Inflow — Primary 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. Hyd.CA[O 8.00sin 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rain/all=2.70" Page 17 3/6/2007 Time (hours) m� 0.00 0.25 0.50 0.75 1.00 1.25 1.50 N� 1.75 2.00 2.25 N� 2.50 2.75 3.00 3.25 3.50 N� 3.75 4.00 4.25 N� 4.50 m� 475 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 N� 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11 .00 m� 11.25 11.50 11.75 12.00 12.25 12.50 N� 12.75 13.00 1 Inflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.57 55.99 145.78 175.54 149.04 Hydrograph for Link 42L: J-3 Outfall Elevation Primary (feet) (ofs\ 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time (hours) 13.25 13.50 0.00 13.75 0.00 14.00 0.00 14.25 0.00 14.50 0.00 14.75 0.00 15.00 0,00 15.25 0.00 15.50 0.00 15.75 0.00 16.00 0.00 16.25 0.00 16.50 0.00 16.75 0.00 17,00 0.00 17.26 0.00 17.50 0.00 17.75 0.00 18.00 0.00 18.25 0.00 18.50 0.00 18.75 0.00 19.00 0.00 19.25 0.00 19.50 0.00 19.75 0.00 20.00 0.00 20.25 0.00 20.50 0.00 20.75 0.00 21.00 0.00 21.25 0.00 21.50 0.00 21.75 0.00 22.00 0.00 22.25 0.00 22.50 0.00 22.75 0.00 23.00 0.00 23.25 0.00 23.50 0.00 23.75 0.00 24.00 0.00 0.00 0.00 0.00 4.57 55.99 145.78 175.54 149.04 Inflow (cfs) 113.86 90.57 74.66 63.46 55.40 49.25 44.81 41.59 39.15 37.40 35.85 34.37 32.89 31.46 30.26 29.36 28.68 28.12 27.60 27.10 26.61 26.10 25.59 25.06 24.52 23.96 23.39 22.81 22.21 21.65 21.19 20.89 20.71 20.59 20.50 20.42 20.36 20.29 20.22 20.15 20.08 20.01 19.34 19.86 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 113.86 90.57 74.66 63.46 55.40 49.25 44.81 41.59 39.15 37.40 35.85 34.37 32.89 31.46 30.26 29.36 28.68 28.12 27.60 27.10 26.61 26.10 25.59 25.06 24.52 23.96 23.39 22.81 22.21 21.65 21.19 20.89 20.71 20.59 20.50 20.42 20.36 20.29 20.22 20.15 20.08 20.01 19.94 19.86 SSubcat Reach 17S Area J2 PRE Link Drainage Diagram for Pre -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroCADQ 8.00 sin 004370 O 2006 HydroCAD Software Solutions LLC Pre -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcats) 185.269 57 Oak/aspen range, Fair, HSG C (17S) 3.950 63 Sagebrush range, Fair, HSG C (17S) 463.791 70 Brush, Fair, HSG C (17S) 20.060 77 Woods, Poor, HSG C (17S) 4.530 82 Farmsteads, HSG C (17S) 677.600 Page 2 3/6/2007 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Type 11 24 -hr 100 YEAR Rainfa11=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=5.00-24.00 hrs, dt=0.05 hrs, 381 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 17S: Area J2 Runoff Area=677.600 ac Runoff Depth>0.43" Flow Length=12,997' Tc=57.1 min CN=67 Runoff=116.09 cfs 24.350 af Total Runoff Area = 677.600 ac Runoff Volume = 24.350 af Average Runoff Depth = 0.43" 100.00% Pervious Area = 677.600 ac 0.00% Impervious Area = 0.000 ac 125; 120' 115- 110- 105_ 100- 95- 90- 85- 84 3 75. 70' 65-, 60 55` 50= 45= 40 35 30- 25 20 15 10- Pre -Development Type 1/ 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 4 H droCADO 8.00 stn 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 17S: Area J2 Runoff = 116.09 cfs @ 12.72 hrs, Volume= 24.350 af, Depths 0.43" Runoff by SCS TR -20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type 1124 -hr 100 YEAR Rainfall=2.70" Area (ac) CN Description 185.269 57 Oak/aspen range, Fair, HSG C 463.791 70 Brush, Fair, HSG C 4.530 82 Farmsteads, HSG C 3.950 63 Sagebrush range, Fair, HSG C 20.060 77 Woods, Poor, HSG C 677.600 67 Weighted Average 677.600 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 29.3 100 0.0284 0.06 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 6.5 3,008 0.2305 7.73 Shallow Concentrated Flow, Unpaved Kw-- 16.1 fps 21.3 9,889 0.1124 7.73 15.46 Channel Flow, Area= 2.0 sf Perim 6.3' r= 0.32' n= 0.030 Earth, grassed & winding 57.1 12,997 Total 130. Subcatchment 17S: Area J2 Hydrograph 5 0 1 116.09 cfs 1 Type 1124 -hr 100 YEAR Rainfall=2.70" Runoff Area=677.600 ac Runoff Volume=24.350 af Runoff Depth>0.43" Flow Length=12,997' Tc=57.1 min CN=67 6 7 8 9 10 11 12 13 14 15 16 Time (hours) 17 18 19 20 21 22 23 24 — Rano 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Type���-�r���\��\/� ����0=� Pre-Development-Development''70" Prepared by Gamba & Associates, Inc. Page 5 HvdroCAO®8.DO sin 004370 © 2006 HydroCAD Software Solutions LLC 3/812007 Hydrograph for Subcatchment 17S: Area J2 Time Precip. Excess (hours) (inches) (inches) 5]00 0.17 0.80 5.25 0.18 0.00 5.50 0.19 0.00 5.75 0.20 0.00 0.00 0.22 0.00 6.25 0.23 0D0 6.50 0.24 0.00 6.75 0.25 0.00 7.00 0.27 0.00 7.25 0.28 0.08 7.50 029 0.00 7.75 0.31 0.00 8.00 0.32 0.00 8.25 0.34 0.00 8.60 0.38 0.00 8.75 0,38 0.00 9.00 0.40 0.00 9.25 0.42 0.00 9.50 0.44 0.00 9.75 0.48 0.00 10.00 0.49 0.00 10.26 0.62 0.00 10.50 0.55 0.00 10.75 0.59 0.00 11.00 0.83 0.00 11.25 0.69 0.08 11.50 0.76 0.00 11.75 1.04 0.00 12.00 1.79 0i11 12.25 1.91 0.15 12.50 1}98 0.17 12.75 2.04 0i19 13.00 2.08 0.20 13.25 2.12 0.21 13.50 2.16 0.23 13.75 219 0.24 14.00 2.21 0.25 14.25 2.24 025 14.50 2.26 0.28 14.75 2.28 0.27 15.08 2.30 0.28 15.25 2.32 0.20 15.50 2.34 0.28 15.75 2.36 0.30 18.00 2.38 0.31 16.25 2.39 0.31 16.50 2.41 0.32 1675 2.42 0.32 17.00 2.43 0.33 17.25 2.45 0.34 17.50 2/46 0.34 17.75 2.47 0.35 18O0 3.49 0.35 Runoff (cfs) 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.46 39.83 99.12 115.94 95.89 73.25 57.89 47.45 40.08 34.74 30.65 27.68 25.48 23.84 22.61 21.51 20.44 19.37 18.35 17.48 16.82 16.31 15.87 15.46 15.07 Time (hours) 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. Excess (inches) (inches) 2.50 0.36 2.51 0.36 2.52 0.37 2.53 0.37 2.54 0.37 2.55 0.38 2.56 0.38 2.57 0.39 2.58 0.39 2.59 0.39 2.60 0.40 2.60 0.40 2.61 0.40 2.62 0.41 2.63 0.41 2.64 0.42 2.65 0.42 2.65 0.42 2.66 0.43 2.67 0.43 2.68 0.43 2.68 0.44 2.69 0.44 2.70 0.44 Runoff (cfs) 14.69 14.30 13.90 13.50 13.10 12.68 12.26 11.83 11.39 10.97 10.64 10.41 10.26 10.15 10.06 9.98 9.91 9.84 9.76 9.69 9.62 9.55 9.47 9.40 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 (Subcat <59S> Are J-2 U <54S> /5/5\1;\)\ J -2 -Bypass Por4I-J2 U 55 L J-2 Outfall Reach Link Drainage Diagram for Post -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroCADO 8.00 sin 004370 O 2006 HydroCAd Software Solutions LLC Post -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/612007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 172.279 57 Oak/aspen range, Fair, HSG C (59S) 3.845 63 Sagebrush range, Fair, HSG C (59S) 472.301 70 Brush, Fair, HSG C (54S,59S) 2.078 74 >75% Grass cover, Good, HSG C (59S) 3.443 79 Pasture/grassland/range, Fair, HSG C (59S) 26.760 98 Paved parking & roofs (59S) 680.706 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 1! 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=0.00-24.613 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=15.838 ac Runoff Depth}0.55" Tc=5.0 min CN=70 Runoff=14.44 cfs 0.730 of Subcatchment 54S: J -2 -Bypass Subcatchment 59S: Area J-2 Pond 55P: Pond -J2 Link 55L: J-2 Outfall Runoff Area=884.868 ac Runoff Depth>0.47" Flow Length=12,002' Tc=51.4 min CN=68 Runoff=138.64 cfs 25.907 af Peak EIev=7,310.00` Storage=1.676 af Inflow=138.64 cfs 25.907 af Outflow=104.37 cfs 25.903 af Inflow=105.52 cfs 26.633 af Primary=105.52 cfs 26.633 af Total Runoff Area = 680.706 ac Runoff Volume = 26.638 of Average Runoff Depth = 0.47" 96.07% Pervious Area = 653.946 ac 3.93% Impervious Area = 26.760 ac Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 4 HydroCADO 8.00 sin 004370 a 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 54S: J -2 -Bypass [49] Hint: Tc<2dt may require smaller dt Runoff = 14.44 cfs @ 11.97 hrs, Volume= 0.730 af, Depth> 0.55" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type 11 24 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 15.838 15.838 70 Brush, Fair, H GC Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) _ (ft/ft) (ft/sec) (cfs) 5.0 16- 15- 14H 13: q 9._ 4 ▪ 7 64 4- 2- 3 Direct Entry, Subcatchment 54S: J -2 -Bypass Hydrograph 14.44 cfs Type 1124 -hr 100 Year Rainfall=2.70" Runoff Area=15.838 ac Runoff Volume=0.730 af Runoff Depth>0.55" Tc=5.0 min CN=70 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by (�8n1b0��Associates, Inc. CAD�OD sin 002O06Hydro�ADSohwmne8ou�onmLLC Hydnz 8� / Hydrograph for Subcatchment 54S: J -2 -Bypass Type If24J7rYD0 Year R@infall=2.70" Page 5 3/612007 Time Pnacip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.25 0.01 0.00 0.50 0.01 0.00 0.75 0.02 0.00 1.00 8.03 0.00 1.25 0.04 0.00 1.50 0.04 0.08 1.75 0.05 0.00 2.00 0.08 0.00 2.25 0.07 0.00 2.50 0.08 0.00 2.75 0.08 0.00 3.00 0.00 0.00 3.25 0.10 0.00 3.50 0.11 0.00 3.75 0.12 0.00 4.00 0.13 0.00 4.25 0.14 0.00 4.50 0.15 0.00 4.75 0.16 0.00 5.00 0.17 0.00 5.25 0.18 0.00 5.50 0L19 0.00 5.75 0.20 0.00 6.00 0.22 0.00 6.25 0.23 0.00 8.50 0.24 0.00 6.75 0.25 0.00 7.00 0.27 0.00 7.25 0.28 0.00 7.50 0.29 0.00 7.75 0.31 0.00 8.00 0.32 0.00 8.25 0.34 0.00 8.50 0.36 0.00 8.75 0.38 0.00 8.00 0/40 0.08 9.25 0.42 0.00 9.50 0.44 0.00 9.75 0.48 0.00 10.00 0.43 0.00 10.25 0.52 0.00 10.50 0.56 0.00 10.75 0.58 0.00 11.00 0.83 0.00 11.25 0.69 0.00 11.50 0.76 0.00 11.75 1.04 0.01 12.00 1.79 0.17 12.25 1.91 0.21 12.50 1.90 0.23 12.75 2.04 0.26 13.00 2.08 0.27 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 O.0O 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.77 13.77 2.42 1.66 1.28 1.10 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 13.25 2.12 0.29 0.97 13.50 2.16 0.30 0.87 13.75 2.19 0.32 0.78 14.00 2.21 0.33 0.70 14.25 2.24 0.34 0.66 14.50 2.26 0.36 0.83 14J5 2.28 0.36 0.81 15.00 2.30 0.37 0.58 15.25 2.32 0.37 0.55 15.50 2.34 0.38 0.63 15.75 2.36 0.39 0.49 18D0 2.38 0.40 0/46 16.25 2.39 0.40 0.44 18.50 2.41 0.41 0.43 16.75 2.42 0.42 0.43 17.00 2.43 0.42 0.41 17.25 2.45 0.43 0.40 17.50 2.46 0.44 0.39 17.75 2.47 0.44 0.38 18.00 2.49 0.45 0.37 18.25 2.50 0,46 0.36 18.50 2.51 0/6 0.35 18.75 2.52 0.47 0.34 19D0 2.53 0.47 0.33 19.25 2.54 0.48 0.31 19.50 2.55 0.48 8.30 19.75 2.56 0.48 0.29 20.00 2.57 0.49 0.28 30.25 2.58 0.49 0.27 20.60 2.69 0.50 0.27 20.75 2.60 0.50 0.27 21.00 2.60 0.51 0.27 21.25 2.61 0.51 0.27 21.50 2.62 0i51 0.28 21.75 2.63 0.52 0.26 22.00 2.64 0.52 0.26 22.25 2.65 0.53 0.26 22.50 2.65 0.53 0.26 22.75 2.66 0.53 0.25 23.00 2.67 0.54 0.25 23.25 2.68 0.54 0.25 23.50 2.68 0.55 0.25 23.75 3.69 0.56 0.25 24.00 2.70 0.55 0.24 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 6 H droCAD® 8.00 sin 004370 U 2006 H droCAD Software Solutions LLC 3/6/2007 Subcatchment 59S: Area J-2 Runoff = 138.64 cfs @ 12.62 hrs, Volume= 25.907 af, Depth> 0.47" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 172.279 57 Oak/aspen range, Fair, HSG C 456.463 70 Brush, Fair, HSG C 3.443 79 Pasture/grassland/range, Fair, HSG C 3.845 63 Sagebrush range, Fair, HSG C 2.078 74 >75% Grass cover, Good, HSG C 26.760 98 Paved parking & roofs 664.868 68 Weighted Average 638.108 Pervious Area 26.760 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ft/sec) (cfs) 26.5 100 0.0365 0.06 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 0.6 159 0.0709 4.29 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 2.2 1,354 0.0508 10,32 82.57 Channel Flow, Area= 8.0 sf Perim= 9.0' r= 0.89' n= 0.030 Earth, grassed & winding 2.9 1,171 0.1716 6.67 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.2 174 0.0889 13.65 109.23 Channel Flow, Area= 8.0 sf Perim= 9.0' r= 0.89' n= 0.030 2.3 1,242 0.3172 9.07 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 16.7 7,802 0.1138 7.78 15.55 Channel Flow, Area= 2.0 sf Perim= 6.3' r= 0.32' n= 0.030 51.4 12,002 Total 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -development Type /1 24 -hr 100 Year RarrifaIl=2.70" Prepared by Ganba & Associates, Inc. Page 7 HydroCAD® 8,00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/612007 V 0 w Subcatchment 595: Area J-2 Hydrograph 150- 140- 130- 120- 110- 100- 90- 80 50- 140-130120-110-100-90-80 74 60- 50- 40 0- 20- 107 -20-107 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 1 138.64 efs Type 11 24 -hr 100 Year Rainfall=2.70" Runoff Area=664.868 ac Runoff Volume=25.907 of Runoff Depth?0.47" Flow Length=12,002' Tc=51.4 min CN=68 — Runoff Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 0 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 8 3/612007 Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.25 0.01 0.00 0.50 0.01 0,00 0.75 0.02 0.00 1.00 0.03 0.00 1.25 0.04 0.00 1.50 0.04 0.00 1.75 0.05 0,00 2.00 0.06 0.00 2.25 0.07 0.00 2.50 0.08 0.00 2.75 0.08 0.00 3.00 0.09 0.00 3.25 0.10 0.00 3.50 0.11 0.00 3.75 0.12 0.00 4.00 0.13 0.00 4.25 0.14 0.00 4.50 0.15 0.00 4.75 0.16 0.00 5.00 0.17 0.00 5.25 0.18 0.00 5.50 0.19 0.00 5.75 0.20 0.00 6.00 0.22 0.00 6.25 0.23 0.00 6.50 0.24 0.00 6.75 0.25 0.00 7.00 0.27 0.00 7.25 0.28 0.00 7.50 0.29 0.00 7.75 0.31 0.00 8.00 0.32 0.00 8.25 0.34 0.00 8.50 0.36 0.00 8.75 0.38 0.00 9.00 0.40 0.00 9.25 0.42 0.00 9.50 0.44 0.00 9.75 0.46 0.00 10.00 0.49 0.00 10.25 0.52 0.00 10.50 0.55 0.00 10.75 0.59 0.00 11.00 0.63 0.00 11.25 0.69 0.00 11.50 0.76 0.00 11.75 1.04 0.00 12.00 1.79 0.13 12.25 1.91 0.16 12.50 1.98 0.19 12.75 2.04 0.21 13.00 2.08 0.22 Hydrograph for Subcatchment 59S: Area J-2 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5.81 61.83 131.08 131.20 96.32 Time Precip. Excess (hours) (inches) (inches) 13.25 2.12 0.24 13.50 2.16 0.25 13.75 2.19 0.26 14.00 2.21 0.27 14.25 2.24 0.28 14.50 2.26 0.29 14.75 2.28 0,30 15.00 2.30 0.31 15.25 2.32 0.31 15.50 2.34 0.32 15.75 2.36 0.33 16.00 2.38 0.34 16.25 2.39 0.34 16.50 2.41 0.35 16.75 2.42 0.35 17.00 2.43 0.36 17.25 2.45 0.37 17.50 2.46 0.37 17.75 2.47 0.38 18.00 2.49 0.38 18.25 2.50 0.39 18.50 2.51 0.39 18.75 2.52 0.40 19.00 2.53 0.40 19.25 2.54 0.41 19.50 2.55 0.41 19.75 2.56 0.41 20.00 2.57 0.42 20.25 2.58 0.42 20.50 2.59 0.43 20.75 2.60 0.43 21.00 2.60 0.43 21.25 2.61 0.44 21.50 2.62 0.44 21.75 2.63 0.45 22.00 2.64 0.45 22.25 2.65 0.45 22.50 2.65 0.46 22.75 2.66 0.46 23.00 2.67 0.46 23.25 2.68 0.47 23.50 2.68 0.47 23.75 2.69 0.48 24,00 2.70 0.48 Runoff (cfs) 72.23 56.39 46.16 39.24 34.14 30.31 27.41 25.52 24.16 22.98 21.86 20.76 19.66 18.62 17.77 17.14 16.64 16.21 15.81 15.41 15.00 14.59 14.18 13.77 13.34 12.90 12.45 12.00 11.56 11.14 10.82 10.61 10.48 10.38 10.30 10.23 10.15 10.07 10.00 9.93 9,85 9.77 9.69 9.61 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Type 1/ 24 -hr 100 Year Rainfall=2.7011 Page 9 3/6/2007 Inflow Area = Inflow = Outflow = Primary = Pond 55P: Pond -J2 664.868 ac, Inflow Depth > 0.47" 138.64 cfs @ 12.62 hrs, Volume= 104.37 cfs @ 12.94 hrs, Volume= 104.37 cfs @ 12.94 hrs, Volume= for 100 Year event 25.907 af 25.903 af, Atten= 25%, Lag= 19.2 min 25.903 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 7,310.00' @ 12.94 hrs Surf.Area= 0.704 ac Storage= 1.676 af Plug -Flow detention time= 3.6 min calculated for 25.903 af (100% of inflow) Center -of -Mass det. time= 3.5 min ( 929.9 - 926.4 ) Volume Invert Avail.Storage Storage Description #1 7,301.00' 3.420 af Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area (feet) (acres) 7,301.00 0,000 7,302.00 0.005 7,304.00 0.037 7,306.00 0.092 7,308.00 0.353 7,310.00 0.704 7,312.00 1.041 Device Routing Inc.Store Cum.Store (acre-feet) (acre-feet) 0.000 0.000 0.003 0.003 0.042 0.045 0.129 0.174 0.445 0.619 1.057 1.676 1.745 3.420 Invert Outlet Devices #1 Primary 7,301.00' #2 Primary 7,302.50' 30.0" x 98.0' long Culvert CMP, square edge headwall, Ke= 0.500 Outlet Invert= 7,293.48' S= 0.0767 '1' Cc= 0.900 n= 0.013 Concrete pipe, bends & connections 24.0" Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=104.35 cfs @ 12.94 hrs HW=7,310.00' (Free Discharge) t1=Culvert (Inlet Controls 65.79 cfs @ 13.40 fps) 2=Orifice/Grate (Orifice Controls 38.56 cfs @ 12.27 fps) Post -Development Prepared by Ganba & Associates, Inc. HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Type It 24 -hr 100 Year Rainfall=2.70" Page 10 3/6/2007 Pond 55P: Pond -J2 Hydrograph 150- 140- 130- 120- 110: 100- 902. 50-140-130-120-110100- 90- 80= 70. 60: 50 40_ 30- 20- 10 - Inflow Area=664.868 ac Peak EIev=7,314.O0' Storage=1.676 of 1138.64 cfs I 1 7 cfs 0 1 2 3 4 7,312 7,311- 7,310- 7,309- 7,308- 11m • 7,307- c a a 7,306) 7,305- 7.304 7,303- 7.302- 7,301 ,303-7.302- 7,301 8 9 10 11 12 13 14 Time (hours) 15 16 17 18 19 20 21 22 23 24 Pond 55P: Pond -J2 Stage -Discharge — inflow — Primary 0 10 20 30 40 50 . 60 . . .70 . 80 90 100 110 Discharge (cfs) 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 O 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 11 3/6/2007 Elevation (feet) 0 7,312 7,311 7,310- 7,309- 7,308- 7,307- 7,3067.- 7,305- 7,304: 7,303 7,302 7,301 0 Pond 55P: Pond -J2 Stage -Area -Storage Surface/Horizontal/Wetted Area (acres) Storage (acre-feet) 2 — Surface — Storage Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 ®OOO8HydnoCADSoftware Solutions LLC Type 11 24 -hr 100 Year Rainfall=2./0" Page 12 3/6/2007 Hydrograph for Pond 55P: Pond -J2 Time Inflow Storage Elevation Primary (hours) (cis) (acre-feet) (feet) (cfs) 0.00 0.00 0.000 7.301.00 0.00 0.60 0.00 0.000 7.301.00 0.00 1.00 8.00 0.000 7.381.00 0.00 1.50 0.00 0.000 7.301.00 0.00 2.00 0.00 0.000 7.301.00 0.00 2.50 0.00 0.000 7.301.00 0.08 3.00 0.00 0.000 7.301.00 0.00 3.50 0.00 0.000 7.301.00 0.00 4.00 0.08 0.000 7.301.00 0.00 4.50 0.00 0.000 7`301.00 0.00 5.00 0.00 0.000 7,381.00 0.00 5.50 0.00 0.000 7.301.00 0.00 8.00 0.08 0.000 7.301.08 0.08 6.50 0.00 0.000 7.301.00 0.00 7.00 0.00 0.000 7.301.00 0.00 7.50 0.00 0.000 7.301.00 0.00 8.00 0.00 0.000 7.301.00 0.00 8.50 0.00 0.000 7.301.00 0.00 9.00 0.00 0.000 7.301.00 0.00 9.50 0.00 0.000 7.301.00 0.00 10.00 0.80 8.000 7.381.00 0.00 10.50 0.00 0.800 7.301.00 0.00 11.00 0.00 DOOD 7.301.00 8.00 11.50 8.00 0.000 7.301.00 0.00 12.00 5.81 0.002 7`301.82 5.41 12.50 131.08 0.831 7,308.03 09.06 13.00 96.32 1.656 7,309.97 104.16 13.50 56.39 0.820 7.308.01 88.81 14.00 39.24 0.041 7.303.90 39,74 14.50 30.31 0.028 7'303.43 30.58 15.00 25.52 0.020 7.303.19 25.59 15.50 22.98 0.017 7.303.00 23.03 18.00 20.76 0.015 7.302.96 30.82 18.50 18.62 0.012 7.302.84 18.65 17O0 17.14 0.011 7.302.70 17.17 17.50 16.21 0.010 7.302.71 16.23 18.00 15.41 0.009 7^303.80 15.43 18.50 14.59 0.009 7.302.62 14.61 19.00 13.77 0.008 7^302.58 13.78 19.60 12.00 0.007 7.302.51 12.92 20.00 12.00 0.006 7,30244 12.02 20.50 11.14 0.006 7.382.38 11.15 21.00 10.81 0.005 7,302.34 10.82 21.50 10.38 0.085 7,302.33 10.39 22.00 10.23 0.005 7.302.32 10.23 22.50 10.07 0.006 7`302.30 10.07 23.00 9.03 0.005 7.302.28 9.93 23.50 9.77 0.005 7.302.38 9.78 24.00 9.81 0.004 7.30227 9.62 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development .,,7�»e824-hyY00Year R8in0a8=2.70" 13 Prepared bV(�@[Db8 ��/\83OCi@tes. Inc, Page HydroCADO 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Stage -Discharge for Pond 55P: Pond -J2 Elevation Primary Elevation Primary Elevation Primary (feet)(�s) (feet)k�o) (feet)(�a) I7,301.000.00 7,304.18 45.27 7.307.36 O3.15 7.301.08 0.03 7,304.24 46.37 7,307.42 83.69 7.301.12 0.10 7.304.38 47.44 7`307.48 84.23 I 7,301.18 823 73043G 4847 7307.S4 84.77 . . . � 7.301.24 0.40 7,304.42 49.44 7^307.80 85.30 7.301.80 0.62 7.304.48 50.32 7.307.86 85.83 7.301.38 0.89 7.304.54 51.19 7.307.72 88.35 I 7.�U1.42 1�3D 7.30�.G0 5��10 7.3O778 8S.88 7.801.48 1.55 7.304.88 52.98 7,307.84 87.39 7.301.54 1.95 7,304,72 53,85 7.307.00 87.91 7,301.60 2.39 7,304.78 54.71 7.307.96 88.42 I7.3U1�88 2.87 7.304�84 55.55 7,308.02 88.83 7.381.72 3.38 7.304.90 56.37 7.308.08 89.44 7,301.78 3.93 7,304.98 57.19 7`308.14 80.95 �� 7,301.84 73O5O� 57.99 7,308.20 90.45 �� 4.52. . ~~ 7.301.00 5.14 7.305D8 58.77 7.308.26 90.95 7.301.98 5.79 7,305.14 59.55 7.308.32 91.44 7^302.02 6.47 7'305.20 60.32 7.308.38 91.93 I 7.3O2�O8 7�1D 7.3O6.28 81�O7 7.3O8.44 A2.43 7.302.14 7.92 7.305.32 61.82 7.388.50 92.91 7.802.20 8.69 7.305.38 62.56 7,308.56 93.40 7.302.20 9.48 7.305.44 63.28 7.308.82 93.88 I�.3O2.82 10.28 7.305�5D 64.00 7,308.68 04,88 7.302.38 11.11 7.305.56 64.71 7.308.74 94.84 7.302.44 11.96 7,305.62 65.41 7,308.80 95.31 I 73O25O 1282 73U6G8 6S.11 7'3U8.88 95.79 . � . . . 7,302.561372 7,305.7466.797,308.9296.28 7.302.62 14.68 7`305.80 67.47 7.308.08 98.73 7.302.88 15.68 7.305.88 88.15 7.309.04 97.19 U 73U274 73O682 G881 7.3O0.10 97.86 ' � 16.74' ' � 7.303.80 17.83 7.305.98 69.47 7.309.16 98.13 7.302.88 18.97 7.306.04 70.12 7.309.23 98.58 7.302.92 20.14 7.308.10 70.77 7,309.28 99.03 N� 7,302.98 21.34 7.300�10 71.41 7.3O0�34 99.49 -- 7.303.04 22.57 7,306.22 72.04 7.309.40 90.94 7.303.10 28.81 7,308.38 72.67 7.300.46 100.39 7.303.10 25.06 7,306.34 73.29 7.309.52 100.84 U 7^3U3.22 28�31 7.3DG�4O 73.91 7,309,58 101.28 7.302.28 27.56 7.308.40 74.52 7.300,84 101.73 7.303.34 28.78 7.306.52 75.13 7.309.70 102.18 I 73D340 2997 73O858 7573 T.30&.78 102.S2 ^ ' ' ' � � 7,303.46 31.10 7.306.64 76.33 7.309.83 103.08 7,303.52 32.17 7.386.70 70.92 7.309.88 103.49 7.303.58 33.38 7.306.78 77.51 7,309.94 103.93 I 73O3R� 730682 78O8 7.310�OU 1O4.38 ' ' 34.59^ � ' 7.30370 35.80 7`308.88 78.67 7.310.06 104.80 7.303J6 37.01 7.208.94 79.24 7.310.12 105.23 7.303.82 38.22 7.307.00 79.81 7.310.18 105.65 I7.3U3.88 39.42 7.307�U8 80.38 7,310.24 106.08 7,303.94 40.82 7,307.12 80.94 7`310.30 108.51 7`304.00 41.81 7,307.18 81.50 7,310.36 106.93 I 73O�O8 4�B8 73U724 82.O5 7.31D.42 1O7.35 ' � ' ' ' 7,304.12 44.13 7,307.30 82.60 | 7,310.48 107.77 Elevation Primary (feet) (cfs) 7.310.54 10819 7.310f80 108.60 7.310.88 109.02 7.31073 109.43 7,310.78 109.84 7.310.84 110.25 7.310.90 110.86 7.310.08 111.07 7.311I2 111.48 7,311.08 111.88 7,311.14 112.28 7.311.20 112.68 7,311.26 113.08 7,311.32 113.48 7,311.38 113.88 7,311.44 114.27 7.311.50 114.67 7,311.56 115.06 7,311.62 115.45 7.311J68 115.84 7,311.74 116.23 7,311.80 116]62 7,311.86 117.01 7.311.92 117.39 7,311.98 117J8 Post -Development Type 11 24 -hr 100 Year Rainfal1=2.70" Prepared by Gamba & Associates, Inc. Page 14 HydroCAD® 8.00 sin 004370 0 2006 HydroCAD Software Solutions LLC 3/6/2007 Stage -Area -Storage for Pond 55P: Pond -J2 Elevation Surface Storage (feet) (acres) (acre-feet) 7,301.00 0.000 0.000 7,301.15 0.001 0.000 7,301.30 0.002 0.000 7,301.45 0.002 0.001 7,301.60 0.003 0.001 7,301.75 0.004 0.001 7,301.90 0.004 0.002 7,302.05 0.006 0.003 7,302.20 0.008 0.004 7,302.35 0.011 0.005 7,302.50 0.013 0.007 7,302.65 0.015 0.009 7,302.80 0.018 0.012 7,302.95 0.020 0.014 7,303.10 0.023 0.018 7,303.25 0.025 0.021 7,303.40 0.027 0.025 7,303.55 0.030 0.029 7,303.70 0.032 0.034 7,303,85 0.035 0.039 7,304.00 0.037 0.045 7,304.15 0.041 0.050 7,304.30 0.045 0.057 7,304.45 0.049 0.064 7,304.60 0.054 0.072 7,304.75 0.058 0.080 7,304.90 0.062 0.089 7,305.05 0.066 0.099 7,305.20 0.070 0.109 7,305.35 0.074 0.120 7,305.50 0.078 0.131 7,305.65 0.082 0.143 7,305.80 0.087 0.156 7,305.95 0.091 0.169 7,306.10 0.105 0.183 7,306,25 0.125 0.201 7,306.40 0.144 0.221 7,306.55 0.164 0.244 7,306.70 0.183 0.270 7,306.85 0.203 0.299 7,307.00 0.223 0.331 7,307.15 0.242 0.366 7,307.30 0.262 0.403 7,307.45 0.281 0.444 7,307.60 0.301 0.488 7,307.75 0.320 0.534 7,307.90 0.340 0.584 7,308.05 0.362 0.636 7,308.20 0.388 0.693 7,308.35 0.414 0.753 7,308.50 0.441 0.817 7,308.65 0.467 0.885 7,308.80 0.493 0.957 Elevation Surface Storage (feet) (acres) (acre-feet 7,308.95 0.520 1.033 7,309.10 0.546 1.113 7,309.25 0.572 1.197 7,309.40 0.599 1.285 7,309.55 0.625 1.376 7,309.70 0.651 1.472 7,309.85 0.678 1.572 7,310.00 0.704 1.676 7,310.15 0.729 1.783 7,310.30 0.755 1.894 7,310.45 0.780 2.009 7,310.60 0.805 2.128 7,310.75 0.830 2.251 7,310.90 0.856 2.377 7,311.05 0.881 2.508 7,311.20 0.906 2.642 7,311.35 0.931 2.779 7,311.50 0.957 2.921 7,311.65 0.982 3.066 7,311.80 1.007 3.216 7,311.95 1.033 3.369 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -development Type 11 24 -hr 100 Year Rainfa11=2.70" Prepared by Gamba & Associates, Inc. Page 15 HydroCAD® 6.00 slrl 004370 ® 2006 HydroCAD Software Solutions LLC 3/6/2007 Link 55L: J-2 Outfall Inflow Area = 680.706 ac, Inflow Depth > 0.47" for 100 Year event Inflow = 105.52 cfs © 12.93 hrs, Volume= 26.633 af Primary = 105.52 cfs @ 12.93 hrs, Volume= 26.633 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 55L: J-2 Outfall 11 11 10 10 9 9 8 8 7 7 6 u 6 0 5 LT. 5 4 4� 3 3 2 2 Hydrog raph Inflow Area=680.706 ac 105.52 cis 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Inflow y — Primary 1 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 0 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 16 3/6/2007 Hydrograph for Link 55L: J-2 Outfall Time Inflow Elevation Primary Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 13.25 100.67 0.00 100.67 0.25 0.00 0.00 0.00 13.50 89.68 0.00 89.68 0.50 0.00 0.00 0.00 13.75 57.85 0.00 57.85 0.75 0.00 0.00 0.00 14.00 40.44 0.00 40.44 1.00 0.00 0.00 0.00 14.25 35.15 0.00 35.15 1.25 0.00 0.00 0.00 14.50 31.21 0.00 31.21 1.50 0.00 0.00 0.00 14.75 28.16 0.00 28.16 1.75 0.00 0.00 0.00 15.00 26.17 0.00 26.17 2.00 0.00 0.00 0.00 15.25 24.77 0.00 24.77 2.25 0.00 0.00 0.00 15.50 23.56 0.00 23.56 2.50 0.00 0.00 0.00 15.75 22.41 0.00 22.41 2.75 0.00 0.00 0.00 16.00 21,28 0.00 21.28 3.00 0.00 0.00 0.00 16.25 20.15 0.00 20.15 3.25 0.00 0.00 0.00 16.50 19.09 0.00 19.09 3.50 0.00 0.00 0.00 16.75 18.22 0.00 18.22 3.75 0.00 0.00 0.00 17.00 17.58 0.00 17.58 4.00 0.00 0.00 0.00 17.25 17.07 0.00 17.07 4.25 0.00 0.00 0.00 17.50 16.63 0.00 16.63 4.50 0.00 0.00 0.00 17.75 16.21 0.00 16.21 4.75 0.00 0.00 0.00 18.00 15.80 0.00 15.80 5.00 0.00 0,00 0.00 18.25 15.39 0.00 15.39 5.25 0.00 0.00 0.00 18.50 14.96 0.00 14.96 5.50 0.00 0.00 0.00 18.75 14.54 0.00 14.54 5.75 0.00 0.00 0.00 19.00 14.11 0.00 14.11 6.00 0.00 0.00 0.00 19.25 13.67 0.00 13.67 6.25 0.00 0.00 0.00 19.50 13.22 0.00 13.22 6.50 0.00 0.00 0.00 19.75 12.77 0.00 12.77 6.75 0.00 0.00 0.00 20.00 12.30 0.00 12.30 7.00 0.00 0.00 0.00 20.25 11.84 0.00 11.84 7.25 0.00 0.00 0.00 20.50 11.42 0.00 11.42 7.50 0.00 0.00 0.00 20.75 11.10 0.00 11.10 7.75 0.00 0.00 0.00 21.00 10.89 0.00 10.89 8.00 0.00 0.00 0.00 21.25 10.75 0.00 10.75 8.25 0.00 0.00 0.00 21.50 10.65 0.00 10.65 8.50 0.00 0.00 0.00 21.75 10.56 0.00 10,56 8.75 0.00 0,00 0.00 22.00 10.49 0.00 10.49 9.00 0.00 0.00 0.00 22.25 10.41 0.00 10.41 9.25 0.00 0.00 0.00 22.50 10.33 0.00 10.33 9.50 0.00 0.00 0.00 22.75 10.25 0.00 10.25 9.75 0.00 0.00 0.00 23.00 10.18 0.00 10.18 10.00 0.00 0.00 0.00 23.25 10,10 0.00 10.10 10.25 0.00 0.00 0.00 23.50 10.02 0.00 10.02 10.50 0.00 0.00 0.00 23.75 9.94 0.00 9.94 10.75 0.00 0.00 0.00 24.00 9.86 0.00 9.86 11.00 0.00 0.00 0.00 11.25 0.00 0.00 0.00 11.50 0.00 0.00 0.00 11.75 0.77 0.00 0.77 12.00 19.18 0.00 19.18 12.25 54.73 0.00 54.73 12.50 90.72 0.00 90.72 12.75 103.13 0.00 103.13 13.00 105.26 0.00 105.26 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Reach Area K PRE Link Drainage Diagram for Pre.Development Prepared by Gamba & Associates, Inc. 31612007 HydroCAD® 8.00 sin 004370 O 2006 HydroCAD Software Solutions LLC Pre -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 sin 004370 0 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 51.410 56 Brush, Fair, HSG B (11S) 35.570 70 Brush, Fair, HSG C (11S) 86.980 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Type 11 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=5.00-24.00 hrs, dt=0.05 hrs, 381 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 11S: Area K Runoff Area=86.980 ac Runoff Depth>0.28" Flow Length=2,300' Tc=44.0 min CN=62 Runoff=8.72 cfs 2.022 af Total Runoff Area = 86.980 ac Runoff Volume = 2.022 af Average Runoff Depth = 0.28" 100.00% Pervious Area = 86.980 ac 0.00% Impervious Area = 0.000 ac Pre -Development Prepared by Gamba & Associates, Inc. HydroCADO 8.00 sin 004370 © 2006 I-fydroCAD Software Solutions LLC Type 11 24 -hr 100 YEAR Rainfall=2.70" Page 4 3/6/2007 Subcatchment 11S: Area K Runoff = 8/2 cfs @ 12.59 hrs, Volume= 2.022 af, Depths 0.28" Runoff by SCS TR -20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 YEAR Rainfall=2.70" Area (ac) CN Description 51.410 56 Brush, Fair, HSG B 35.570 70 Brush, Fair, HSG C 86.980 86.980 Tc Length (min) (feet) 62 Weighted Average Pervious Area Slope Velocity Capacity (Mt) (ft/sec) (cfs) Description 39.3 100 0.0136 0.04 4.7 2,200 0.2314 7.74 44.0 2,300 Total • 5 • 4 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" Shallow Concentrated Flow, Unpaved Kv= 16.1 fps Subcatchment 115: Area K Hydrograph 0-58r 8.72 cfs Type 11 24 -hr 100 YEAR Rainfall=2.70" Runoff Area=86.980 ac Runoff Volume=2.022 af Runoff Depth>0.28" Flow Length=2,300' Tc=44.0 min CN=62 9 10 11 12 13 14 15 16 17 18 19 20 21 Time (hours) 22 23 24 — Runoff 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Prepared ' Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 C 2006 HdroCAD Software Solutions LLC Type 11 24 -hr 100 YEAR Rain/all=2.70" Page 5 3/6/2007 Time Precip. (hours) (inches) 5.00 0.17 5.25 0.18 5.50 0.19 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 1325 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 2.12 2.16 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2.43 2.45 2.46 2.47 2.49 Excess (inches) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.05 0.07 0.08 0.10 0.11 0.11 0.12 0.13 0.14 0.14 0.15 0.16 0.16 0.17 0.17 0.18 0.18 0.19 0.19 0.19 0.20 0.20 0.21 0.21 0.22 Hydrograph for Subcatchment 115: Area K Runoff 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.23 4.17 8.45 7.90 6.07 4.83 4.01 3.47 3.07 2.75 2.49 2.32 2.21 2.11 2.03 1.94 1.85 1.75 1.67 1.61 1.50 1.53 1.49 1.46 1.42 Time /hours) (inches) 18.25 2.50 18.50 2.61 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 2_52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.83 2.64 2.65 2.65 2.66 2.67 2,88 2.68 2.69 2.70 Excess (inches) 0.22 0.22 0.23 0.23 0.23 0.24 0.24 0.24 0.24 0.25 0.25 0.25 0.26 0.26 0.26 0.26 0.27 0.27 0.27 0.28 0.28 0.28 0.28 0.29 Runoff (cfs) 1.39 1.36 1.32 1.28 1.24 1.20 110 1.12 1.08 1.05 1.02 1.01 1.00 0.99 0.99 0.98 0.97 0.97 0.96 0.96 0.95 0.94 0.94 0.93 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 \ubca/ Reach K70S) Area -K Link Drainage Diagram► for Post -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroGAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Post-Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 51.022 56 Brush, Fair, HSG B (70S) 33.114 70 Brush, Fair, HSG C (70S) 0.172 74 >75% Grass cover, Good, HSG C (70S) 1.217 98 Paved parking & roofs (70S) 85.525 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 O 2006 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 708: Area -K Runoff Area=85.525 ac Runoff Depth>0.28" Flow Length=1,958' Tc=22.1 min CN=62 Runoff=13.33 cfs 2.014 af Total Runoff Area = 85.525 ac Runoff Volume = 2.014 af Average Runoff Depth = 0.28" 98.58% Pervious Area = 84.308 ac 1.42% Impervious Area = 1.217 ac Type ll 24 -hr 100 Year Rainfall=2.70" Page 3 3/6/2007 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 O 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 4 3/6/2007 Subcatchment 70S: Area -K Runoff = 13.33 cfs @ 12.23 hrs, Volume= 2.014 af, Depths 0.28" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type 11 24 -hr 100 Year Rainfall=2.70" Area CN Descri stion 51.022 56 Brush, Fair, HSG B 33.114 70 Brush, Fair, HSG C 0.172 74 >75% Grass cover, Good, HSG C 1.217 98 Paved . arkin. & roofs 85.525 62 Weighted Average 84.308 Pervious Area 1.217 Impervious Area ac Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ft/sec) (cfs) 18.3 100 0.0329 0.09 Sheet Flow, Grass: Dense n= 0.240 P2= 1.30" 3.8 1,868 0.2613 8.23 Shallow Concentrated Flow, Unpaved Kv= 16.1 figs 22.1 1,968 Total Subcatchment 70S: Area -K Hydrograph 14- 13 12- 1 10- 8_ o 7- I 6 4- 3- 2 0 13.33 cfs Type 1124 -hr 100 Year Rainfall=2.70" Runoff Area=85.525 ac Runoff Volume=2.014 af Runoff Depth>0.28" Flow Length=1,968' Tc=22.1 m i n C N =62 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, Time Preoip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.25 0.01 0.80 0.50 0D1 0.00 075 0.03 0.00 1.00 0.03 0.00 1.25 0.04 0.00 1.50 0.04 0.00 175 0.05 0.00 2.00 0.06 0.00 2.26 0.07 0.00 2.50 0.08 0.00 2.75 0.08 0.00 3.00 0.09 0.00 3.25 0.10 0.00 3.50 0.11 0.00 3.75 0.12 0.00 4.00 0.13 0.00 4.25 0.14 0.00 4.50 0.15 0.00 4.75 0.16 0.00 5.00 0.17 0I0 5.25 0.18 0.00 5.50 0.19 8.00 5.75 0.20 0.00 6.00 0.22 0.00 6.25 0.23 0.00 6.58 0.24 0.00 6.75 0.25 0.00 7.00 0.27 0.00 7.25 0.28 0.00 7.50 0.29 0.00 7.75 0.31 0.00 8.00 0.32 0.00 8.25 0.34 0.00 8.50 0.38 0.00 8.75 0.38 0.00 9.00 0.40 0.00 9.25 0.42 0.00 9.50 0.44 0.00 9J5 0.46 0.00 10.00 0.49 0.00 10.25 0.52 0.00 18.50 0.55 8.00 10.75 0.59 0.00 11.00 8.63 0.00 11.26 0.89 0.00 11.50 0.78 0.00 11.75 1.04 0.00 12/00 1.79 0J35 12.25 1.91 0.87 12.50 1.98 0.08 12.75 2.04 0.10 13.00 2.08 0.11 Typell 24 -hr 100 Year Rainfall=2.70" Inc.Page 5 3/6/2007 droCAD Software Solutions LLC Hydrograph for SUbcatchDDent70S: Area -K Runoff Time Precip. Excess Runoff (cfs) (hours) (inches) (inches) (cfs) 0.00 13.25 2.12 011 3.51 0.00 13.50 2.16 012 3.13 0.00 13.75 2.19 0L13 2.82 0l0 14.00 2.21 0i14 2.56 0.00 14.25 2.24 0.14 2.33 0.00 14.50 2.26 015 2.20 0.00 14.75 2.28 0.16 2.12 0.00 15.00 2.30 0.16 2.04 0.00 15.25 2.32 0.17 1J90 0.00 15.50 2.34 0.17 1.88 0.00 15J5 2.36 0.18 1.79 0J00 16.00 2.38 0.18 1.69 0.00 16.25 2.39 8.19 1.60 0.00 16.50 2.41 0.19 1.55 0.00 16.75 2.42 0.19 1.51 0.00 17.00 2.43 0.20 1,48 0.00 17.25 3.45 0.20 1.45 0.00 17.50 2.46 0.21 1.42 0.00 17.75 2.47 0.21 1.39 0.00 18D0 2.49 0.22 1.36 0.00 18.25 2.80 0.22 1.32 0.00 18.50 2.51 0.22 1.28 0.00 18.75 2.52 0.23 1.25 0.00 19D0 2.53 0.23 1.21 0.00 19.25 2.54 0.23 1.17 0.00 19.50 2.55 0.24 1.13 0.00 19.75 2.56 0.24 1.09 0.00 20l0 2.57 0.24 1.05 0.00 20.25 2.58 0.24 1.01 0.00 20.50 2.59 0.25 0.99 0.00 20.75 2.60 0.25 0.98 0.00 21.00 2.60 0.25 0.98 0.00 21.25 2.61 0.26 0.87 0.00 21.60 2.62 0.26 0,97 0.00 21.75 2.63 0.26 0.96 0.00 22.00 2.64 0.26 0.98 0.00 22.25 2.65 0.27 0.95 0.00 22.50 2.65 0.27 0.94 0.80 22.75 2.66 0.27 0.04 0.00 23.00 2.67 0.28 0.93 0.00 23.25 2,88 0.28 0.93 0.00 23.50 2.68 0.28 0.92 0.00 23.75 2.69 0.28 0.91 0.00 24.00 2.70 0.29 0.91 0.00 0.00 0.00 0.00 2.05 13.26 8.03 5.36 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 (Subcat \\\ / Reach 26S Area L PRE Link Drainage Diagram for Pre -Development Prepared by Gamba & Associates. Inc. 3/6/2007 HydroCAD® 8.00 sin 004370 © 2006 HydroGAD Software Solutions LLC Pre -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 29.150 56 Brush, Fair, HSG B (26S) 163.930 70 Brush, Fair, HSG C (265) 193.080 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre-Development Type 1124-hr 100 YEAR Rainfa11=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=5.00-24.00 hrs, dt=0.05 hrs, 381 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Star-Ind method Subcatchment 26S: Area L Runoff Area=193.080 ac Runoff Depth>0.47" Flow Length=5,431' Tc=40.9 min CN=68 Runof=47.23 cfs 7.561 af Total Runoff Area = 193.080 ac Runoff Volume = 7.561 af Average Runoff Depth = 0.47" 100.00% Pervious Area = 193.080 ac 0.00% Impervious Area = 0.000 ac Pre -Development Prepared by Gamba & Associates, Inc. HydroCADO 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 YEAR Rainfall=2.70" Page 4 316/2007 Runoff Subcatchment 26S: Area L 47,23 cfs @ 12.47 hrs, Volume= 7.561 af, Depth> 0.47" Runoff by SCS TR -20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 YEAR Rainfall=2.70" Area (ac) CN Description 29.150 56 Brush, Fair, HSG B 163.930 70 Brush, Fair, HSG C 193.080 68 Weighted Average 193.080 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ftlsec) (cfs) 28.4 100 0.0306 0.06 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 1.2 283 0.0573 3.85 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 4.1 1,727 0.1197 7.10 5.68 Channel Flow, Area= 0.8 sf Perim 3.0' r= 0.27' n= 0.030 7.2 3,321 0.1391 7.65 6.12 Channel Flow, Area= 0.8 sf Perim= 3.0' r= 0.27' n= 0.030 40.9 5,431 Total 52= 50- 48 46= 44 42 404 38= 36 34= 32 m 30 V 28A g 24 22= 20 181 16- 14 12= 10- 8 2 Subcatchment 26S: Area L Hydrograph 47.23 cfs Type I124 -hr 100 YEAR Rainfall=2.70" Runoff Area=193.080 ac Runoff Volurne=7.561 af Runoff Cie pth ►0.47" Flow Length=5431' Tc=40.9 m i n CN=68 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Type /1 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 5 H droCAD® 8.00 s!n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Hydrograph for Subcatchment 26S: Area L Time Precip. Excess (hours) (inches) (inches) 5.00 0.17 0.00 5.25 0.18 0.00 5.50 0.19 0.00 5.75 0.20 0.00 6.00 0.22 0.00 6.25 0,23 0.00 6.50 0.24 0.00 6.75 0.25 0.00 7.00 0.27 0.00 7.25 0.28 0.00 7.50 0.29 0.00 7.75 0.31 0.00 8.00 0.32 0.00 8.25 0.34 0.00 8.50 0.36 0.00 8.75 0.38 0.00 9.00 0.40 0.00 9.25 0.42 0.00 9.50 0.44 0.00 9.75 0.46 0.00 10.00 0.49 0.00 10.25 0.52 0.00 10.50 0.55 0.00 10.75 0.59 0.00 11.00 0.63 0.00 11.25 0.69 0.00 11.50 0.76 0.00 11.75 1.04 0.00 12.00 1.79 0.13 12.25 1.91 0.16 12.50 1.98 0.19 12.75 2.04 0.21 13.00 2.08 0.22 13.25 2.12 0.24 13.50 2.16 0.25 13.75 2.19 0.26 14.00 2.21 0.27 14.25 2.24 0.28 14.50 2.26 0.29 14.75 2.28 0.30 15.00 2.30 0.31 15.25 2.32 0.31 15.50 2.34 0.32 15.75 2.36 0.33 16.00 2.38 0.34 16.25 2.39 0.34 16.50 2.41 0.35 16.75 2.42 0.35 17.00 2.43 0.36 17.25 2.45 0.37 17.50 2.46 0.37 17.75 2.47 0.38 18.00 2.49 0.38 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.67 32.92 46.96 33.83 23.35 17.25 13.77 11.59 10.08 8.88 8.03 7.47 7.08 6.76 6.45 6.14 5.82 5.50 5.22 5.01 4.86 4.74 4.63 4.51 4.40 Time (hours) 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Excess (inches) 0.39 0.39 0.40 0.40 0.41 0.41 0.41 0.42 0.42 0.43 0.43 0.43 0.44 0.44 0.45 0.45 0.45 0.46 0.46 0.46 0.47 0.47 0.48 0.48 Runoff (cfs) 4.28 4.16 4.04 3.92 3.79 3.67 3.53 3.40 3.27 3.16 3.09 3.05 3.02 3.00 2.98 2.95 2.93 2.91 2.89 2.87 2.85 2.82 2.80 2.78 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Reach <64S> Area-L 3S> t 65R Link 64L L Outfall Drainage Diagram for Post -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 1 Post -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 27.370 56 Brush, Fair, HSG B (63S) 0.184 61 >75% Grass cover, Good, HSG B (63S) 134.315 70 Brush, Fair, HSG C (63S,64S) 3.914 74 >75% Grass cover, Good, HSG C (63S,64S) 27.437 98 Paved parking & roofs (63S,64S) 193.220 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfaf1=2.70 Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 63S: Area -L -Bypass Runoff Area=123.793 ac Runoff Depth>0.59" Flow Length=1,990' Tc=34.6 min CN=71 Runoff=47.16 cfs 6.046 af Subcatchment 64S: Area -L Reach 65R: Reach L Pond 63P: Pond L Link 64L: L Outfall Runoff Area=69.427 ac Runoff Depth>0.76" Flow Length=2,101' Tc=33.6 min CN=75 Runoff=38.50 cfs 4.404 af Avg. Depth=0.40' Max Vel=6.13 fps Inflow=2.61 cfs 2.215 af n=0.030 L=3,082.2" S=0.1435 '1' Capacity=2,235.49 cfs Outflow=2.61 cfs 2.167 af Peak Elev=7,519.75' Storage=2.584 af Inflow=38.50 cfs 4.404 af Outflow=2.61 cfs 2.215 af Inflow=47.19 cfs 8.213 af Primary=47.19 cfs 8.213 af Total Runoff Area = 193.220 ac Runoff Volume = 10.450 af Average Runoff Depth = 0.65" 85.80% Pervious Area = 165.783 ac 14.20% Impervious Area = 27.437 ac Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 4 3/6/2007 Runoff Subcatchment 63S: Area -L -Bypass 47.16 cfs @ 12.35 hrs, Volume= 6.046 af, Depth> 0.59" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 Year Rainfall=2.70" Area ac CN Descri.tion 27.370 56 Brush, Fair, HSG B 77.314 70 Brush, Fair, HSG C 16.446 98 Paved parking & roofs 0.184 61 >75% Grass cover, Good, HSG B 2.479 74 >75% Grass cover, Good, HSG C 123.793 71 Weighted Average 107.347 Pervious Area 16.446 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ft/sec) (cfs) 30.7 100 0.0252 0.05 Sheet Flow, Woods: Light underbrush n- 0.400 P2= 1.30" 2.9 1,360 0.2384 7.86 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 1.0 530 0.1762 8.61 6.89 Channel Flow, Area= 0.8 sf Perim= 3.0' r= 0.27' n= 0.030 _ 34.6 1,990 Total 52 5o 48= 46 . 44 42- 40= 38 36_ 34- 32± 30 u 3 V 28- 3 26` • 24 ▪ 22- 20 18- 163. 141 12 10- 4 2 0 Subcatchment 63S: Area -L -Bypass Hydrograph 47.16 cfs 1 Type II 24 -hr 100 Year Rainfall=2.70" Runoff Area=123.793 ac Runoff Volume=6.046 af Runoff Depth>0.59" Flow Length=1,990' Tc=34.6 min CN=71 1 2 3 4 5 6 7 8 9 10 11 12 13 14 '15 16 1'7 18 19 20 21 22 23 24 Time (hours) -- Runnff 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. H droCADO 8.00 sln 004370 U 2006 H droCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 5 3/6/2007 Hydrograph for Subcatchment 63S: Area -L -Bypass Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.25 0.01 0.00 0.50 0.01 0.00 0.75 0.02 0,00 1.00 0.03 0.00 1.25 0.04 0.00 1.50 0.04 0.00 1.75 0.05 0.00 2,00 0.06 0.00 2.25 0.07 0.00 2.50 0.08 0.00 2.75 0.08 0.00 3.00 0.09 0.00 3.25 0.10 0.00 3.50 0.11 0.00 3.75 0.12 0.00 4.00 0.13 0.00 4.25 0.14 0.00 4.50 0.15 0.00 4.75 0.16 0.00 5.00 0.17 0.00 5.25 0.18 0.00 5.50 0.19 0.00 5.75 0.20 0.00 6.00 0.22 0.00 6.25 0.23 0.00 6.50 0.24 0.00 6.75 0.25 0.00 7.00 0.27 0.00 7.25 0.28 0.00 7.50 0.29 0.00 7.75 0.31 0.00 8.00 0.32 0.00 8.25 0.34 0.00 8.50 0.36 0.00 8.75 0.38 0.00 9.00 0.40 0.00 9.25 0.42 0.00 9.50 0.44 0.00 9.75 0.46 0.00 10.00 0.49 0.00 10.25 0.52 0.00 10.50 0.55 0.00 10.75 0.59 0.00 11.00 0.63 0.00 11.25 0.69 0.00 11.50 0.76 0.00 11.75 1.04 0.01 12.00 1.79 0.19 12.25 1.91 0.23 12.50 1.98 0.26 12.75 2.04 0.28 13.00 2.08 0.30 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.07 7.84 42.65 40.43 24.28 15.94 Time Precip. Excess (hours) (inches) (inches) 13.25 2.12 0.32 13.50 2.16 0.33 13.75 2.19 0.34 14.00 2.21 0.36 14.25 2.24 0.37 14.50 2.26 0.38 14.75 2.28 0.39 15.00 2.30 0.40 15.25 2.32 0.41 15.50 2.34 0.41 15.75 2.36 0.42 16.00 2.38 0.43 16.25 2.39 0.44 16.50 2.41 0.45 16.75 2.42 0.45 17.00 2.43 0.46 17.25 2.45 0.47 17.50 2.46 0.47 17.75 2.47 0.48 18.00 2.49 0.48 18.25 2.50 0.49 18.50 2.51 0.50 18.75 2.52 0.50 19.00 2.53 0.51 19.25 2.54 0.51 19.50 2.55 0.52 19.75 2.56 0.52 20.00 2.57 0.53 20.25 2.58 0.53 20.50 2.59 0.54 20.75 2.60 0.54 21.00 2.60 0.54 21.25 2.61 0.55 21.50 2.62 0.55 21.75 2.63 0.56 22.00 2,64 0.56 22.25 2.65 0.57 22.50 2.65 0.57 22.75 2.66 0.57 23.00 2.67 0.58 23.25 2.68 0.58 23.50 2.68 0.59 23.75 2.69 0.59 24.00 2.70 0.59 Runoff (cfs) 11.80 9.54 8.12 7.11 6.36 5.80 5.44 5.18 4.94 4.71 4.47 4.23 3.98 3.78 3.65 3.55 3.46 3.38 3.29 3.20 3.11 3.02 2.93 2.84 2.74 2.65 2.55 2.45 2.35 2.28 2.24 2.21 2.19 2.18 2.16 2.14 2.13 2.11 2.09 2,08 2.06 2.04 2.03 2.01 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 6 HydroCAD® 8.00 sin 004370 a 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 64S: Area -L Runoff = 38.50 cfs @ 12.32 hrs, Volume= 4.404 af, Depth> 0.76" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type 1124 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 57.001 70 Brush, Fair, HSG C 10.991 98 Paved parking & roofs 1.435 74 >75% Grass cover, Good, HSG C 69.427 75 Weighted Average 58.436 Pervious Area 10.991 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 28.4 100 0.0306 0.06 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 1.2 283 0.0573 3.85 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 4.0 1,718 0.1191 7.08 5.67 Channel Flow, Area= 0.8 sf Perim= 3.0' r= 0.27' n= 0.030 33.6 2,101 Total Subcatchment 64S: Area -L Hydrograph 42- 40, 38 36- 34- 32 30= 28, 26 . 24 22- a 20- u. 18' 16 14 12 10• 8 2 - Type I124 -hr 100 Year Rainfall=2.70" Runoff Area=69.427 ac Runoff Volume=4.404 af Runoff Depth>0.76" Flow Length=2,101' Tc=33.6 min CN=75 1 39.50 cfs 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development > vdPrepared^Gamba & Associates, Inc. roCADO `0O sin 004370 © 2006 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 64S: Area -- Type 024-hrY[0 Year Rainfall=2.70" Page 7 3/6/2007 Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.25 0.01 0.00 8.50 0.01 0,00 0.75 0.02 0.00 1.00 8.03 0.00 1.25 0.04 0.00 1.50 0.04 0.00 1.75 0.05 0.00 3.00 0.08 0.00 2.25 0.07 0.00 2.50 0.08 0.00 2.75 0.08 0.00 3.00 0.89 0.00 3.25 0.10 0.00 3.50 0.11 0.00 3.75 012 0J30 4.00 0.13 0.00 4.25 0.14 0.00 4.50 015 0.00 4.75 0.16 0.80 5.00 0.17 0.00 5.25 0.18 0.00 5.50 0.19 0,00 5.75 0.20 0.00 6.00 0.22 0.00 6.25 0.23 0.00 6.60 0.24 0.00 6.75 0.25 0.00 7.00 0.27 0.00 7.25 0.28 0.00 7.50 0.29 0.00 7.75 0.31 0.00 8.80 0.32 0.80 8.25 0.34 0.00 8.50 0.36 0.00 8.75 0.38 0.08 9.00 0.40 0.00 9.25 0.42 0.00 9.50 0/4 0.00 9.75 0/48 0.00 18.00 0.48 0.00 10.35 0.52 0.00 10.50 0.56 0.00 10.75 0.59 0.00 11.00 0.63 0.00 11.25 0.69 0.00 11.50 0.76 0.00 11.75 1.04 0.04 12.00 1.79 0.20 12.25 1.91 0.34 12.50 1.98 0.37 12.75 2.04 0.40 13.08 2.08 0.42 Runoff (cfs) 0.00 0.00 0.00 0,00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.06 0.74 9.68 36.62 30.54 17.39 11.05 Time Precip. Excess Uhouny) (inches) (inches) 13.25 2.12 0.44 13.50 2.16 0/48 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22,00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 2.19 2.21 2.24 2.26 2.28 2.30 2.32 2.34 2.36 2.38 2.39 2.41 2.42 2,43 2.45 2.46 2.47 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 0.48 0.49 0.50 0.52 0.53 0.54 0.55 0.56 0.57 0,58 0.59 0.60 0.60 0.61 0.62 0.63 0.S4 0.64 0.65 0.66 0.66 0.67 0.68 0.68 0.69 0.69 0.70 0.70 0.71 0.71 0.72 0.72 0.73 0.73 0.74 0.74 0.75 0.75 0.76 0.76 0,77 0.77 Runoff (cfs) 8.05 6.45 5.45 4.78 4.26 3.88 3.64 3.46 3.29 3.13 2.97 2.80 2.64 2.50 2.41 2.35 2.28 2.23 2.17 2.10 2.05 1.98 1.92 1.80 1.79 1.73 1.67 1.60 1.53 1.49 1.46 1.44 1.43 1.42 1.41 1.40 1.38 1.37 1.36 1.35 1.34 1.33 1.31 1.30 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc.Page 8 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Reach 65R: Reach L Inflow Area = 69.427 ac, Inflow Depth > 0.38" for 100 Year event Inflow = 2.61 cfs @ 16.29 hrs, Volume= 2.215 of Outflow = 2.61 cfs @ 16.54 hrs, Volume= 2.167 af, Atten= 0%, Lag= 15.2 min Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Max. Velocity= 6.13 fps, Min. Travel Time= 8,4 min Avg. Velocity = 5.70 fps, Avg. Travel Time= 9.0 min Peak Storage= 1,314 cf @ 16.40 hrs, Average Depth at Peak Storage= 0.40' Bank -Full Depth= 5.00', Capacity at Bank -Full= 2,235.49 cfs 0.00' x 5.00' deep channel, n= 0.030 Earth, grassed & winding Side Slope Z -value= 2.7 '/' Top Width= 27.00' Length= 3,082.2' Slope= 0.1435 '1' Inlet Invert= 7,499.99', Outlet Invert= 7,057.57' Reach 65R: Reach L Hydrograph 0-+ Inflow Area=69.427 ac Avg. Depth=0.40' Max Vel=6.13 fps n=0.030 L=3,082.2' S=0.1435 'I' Capacity=2,235.49 cfs f l 2.61 cfs . 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Inflow -- Outflow 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 Q 2006 HydroCAD Software Solutions LLC Type 1124 -hr 100 Year Rainfall=2.70H Page 9 /6/2007 Reach 65R: Reach L Stage -Discharge a 200 5- 4-, 3-- 400 600 .840 1,000 1,200 1,400 1,600 1,800 2,000 2,200 Discharge (cfs) Reach 65R: Reach L Stage -Storage 0-1 0 20,000 40,000 60.000 80,000 100,000 120,000 Storage (cubic -feet) 140,000 160,000 180,000 200,000 -- Primary — Storage Post -Development Type //24-hr100 Year 70" Prepared by Gamba & Associates, Inc. Page e 1O MyUnoCAU0O.UO s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Hydrograph for Reach 65R: Reach L Time Inflow Storage Elevation Outflow (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 7.499.99 0O0 0.80 0.00 0 7.488.98 0.00 1.00 0.00 0 7.499.99 0.00 1.50 0.00 0 7.499.99 0.00 2.00 8.00 0 7.498.99 0.00 2.50 0.00 0 7'499.99 0.00 3.00 0.00 0 7,499.99 0.80 3.50 0.00 0 7,499.99 0.00 4.00 0.00 0 7.499.99 0.00 4.50 0.00 0 7'499.99 0.00 5.00 0.00 0 7'490.09 0.00 5.50 0.00 0 7.499.98 0.00 8.00 0.00 0 7.499.99 0.00 6.50 0.00 0 7,499.99 0.00 7.00 0.00 0 7.499.99 0.00 7.50 0.00 0 7.499.99 0.00 8.00 0.00 0 7.499.99 0.00 8.50 0.00 0 7.499.99 0.00 9.00 0.00 0 7.499.99 0.00 9.50 0.00 0 7.499.99 0.00 10.00 0.00 0 7.489.99 0.00 10.50 0.00 0 7.499.99 0.00 11.00 0.00 0 7.499.99 0.00 11.50 0.00 0 7.499.89 0.00 12.00 0.81 3 7.500.00 0.00 13.50 0.85 351 7.50019 0.17 13.00 1.73 887 7.500.32 1.31 13.50 2.11 1.090 7.500.35 1.94 14.00 2.32 1,186 7.500.37 2.23 14.50 2.45 1,242 7.500.38 2.39 15.00 2.53 1,276 7.500.38 2.49 15.50 2.58 1,298 7.500.38 2.56 18.00 2.61 1,311 7,800.39 2.00 16.50 2.61 1,313 7.500.39 2.61 17.00 2.60 1,309 7.500.39 2.60 17.50 2.58 1,302 7.500.38 2.59 18.00 2.55 1.291 7.500.38 2.58 18,50 2.51 1,279 7`500.38 2.53 19.00 2.47 1,264 7.500.38 2.50 19.50 2.43 1,247 7,500.38 2.45 20.00 2.38 1.228 7.500.37 2.41 30.50 2.33 1,207 7.500.37 2.35 21.00 2.27 1,185 7.500.37 2.30 21.50 2.22 1,184 7.500.38 2.24 22.00 2.17 1,144 7.500.38 2.19 22.50 2.12 1,125 7.500.30 2.14 23.00 2.07 1,106 7.500.35 2.08 23.50 2.03 1.089 7.600.35 2.05 24.00 1.98 1,072 7.500.35 2.01 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 1124 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 11 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 316/2007 Stage -Discharge for Reach 65R: Reach L Elevation Velocity Discharge Elevation Velocity Discharge (cls (feet) (ft/sec) (cfs) 7,499.99 0.00 0.00 7,502.64 21.69 411.25 7,500.04 1.54 0.01 7,502.69 21.96 432.27 I 7,500.09 2.44 0.07 7,502.74 22.23 453.95 7,500.14 3.20 0.19 7,502.79 22.50 476.29 7,500.19 3.87 0.42 7,502.84 22.77 499.31 7,500.24 4.49 0.76 7,502.89 23.03 523.01 I 7,500.29 5.08 1.23 7,502.94 23.30 547.41 7,500.34 5.63 1.86 7,502.99 23.56 572.50 7,500.39 6.15 2.66 7,503.04 23.82 598.30 7,500.44 6.65 3.64 7,503.09 24.08 624.81 I 7,500.49 7.14 4.82 7,503.14 24.34 652.05 7,500.54 7.60 6.21 7,503.19 24.60 680.02 7,500.59 8.06 7.83 7,503.24 24.85 708.72 7,500.64 8.50 9.70 7,503.29 25.11 738.17 7,500.69 8,93 11.81 7,503.34 25.36 768.37 7,500.74 9.35 14.20 7,503.39 25.61 799.34 7,500.79 9.76 16.87 7,503.44 25.86 831.07 I 7,500.84 10.16 19.83 7,503.49 26.11 863.58 7,500.89 10.56 23.09 7,503.54 26.36 896.87 7,500.94 10.95 26.67 7,503.59 26.60 930.95 7,500.99 11.33 30.58 7,503,64 26.85 965.83 I 7,501.04 11.70 34.83 7,503.69 27.10 1,001.51 7,501.09 12.07 39.43 7,503.74 27.34 1,038.01 7,501.14 12.43 44.39 7,503.79 27.58 1,075.33 7,501.19 12.79 49.73 7,503.84 27.82 1,113.48 I 7,501.24 13.14 55.45 7,503.89 28.06 1,152.46 7,501.29 13.49 61.56 7,503.94 28.30 1,192.28 7,501.34 13.83 68.08 7,503.99 28.54 1,232.95 ' 7,501.39 14.17 75.01 7,504.04 28.78 1,274.48 7,501.44 14.51 82.37 7,504.09 29.01 1,316.87 7,501.49 14.84 90.16 7,504,14 29.25 1,360.13 7,501.54 15.17 98.40 7,504.19 29.48 1,404.27 1 7,501.59 15.49 107.10 7,504.24 29.72 1,449.29 7,501.64 15.82 116.25 7,504.29 29.95 1,495.21 7,501.69 16.13 125.89 7,504.34 30.18 1,542.02 7,501.74 16.45 136.00 7,504.39 30.41 1,589.74 I 7,501.79 16.76 146.62 7,504.44 30.64 1, 638.37 7,501.84 17.07 157.73 7,504.49 30.87 1,687.92 7,501.89 17.37 169.35 7,504.54 31.10 1,738.40 7,501.94 17.68 181.50 7,504.59 31.33 1,789.81 I 7,501.99 17.98 194.18 7,504.64 31.55 1,842.16 7,502.04 18.28 207.39 7,504.69 31.78 1,895.46 7,502.09 18.57 221.16 7,504.74 32.01 1,949.71 I 7,502.14 18.87 235.48 7,504.79 32.23 2,004.91 7,502.19 19.16 250.37 7,504.84 32.45 2,061.09 7,502.24 19.45 265.83 7,504.89 32.68 2,118.24 7,502.29 19.74 281.88 7,504.94 32.90 2,176.37 I 7,502.34 20.02 298.52 7,504.99 33.12 2,235.49 7,502.39 20.30 315.75 7,502.44 20.58 333.60 7,502.49 20.86 352.07 I 7,502.54 21.14 371.16 7,502.59 21.42 390.88 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 12 3/6/2007 Stage -Area -Storage for Reach 65R: Reach L Elevation End -Area Storage Elevation End -Area Storage (feet) (sq -ft) (cubic -feet) (feet) (sq -ft) (cubic -feet) 7,499.99 0.0 0 7,502.64 19,0 58,441 7,500,04 0.0 21 7,502.69 19.7 60,667 7,500.09 0.0 83 7,502.74 20.4 62,935 7,500.14 0.1 187 7,502.79 21.2 65,244 7,500.19 0.1 333 7,502.84 21.9 67,595 7,500.24 0.2 520 7,502.89 22.7 69,988 7,500.29 0.2 749 7,502.94 23.5 72,422 7,500.34 0.3 1,019 7,502.99 24.3 74,897 7,500,39 0.4 1,332 7,503.04 25.1 77,415 7,500.44 0.5 1,685 7,503.09 25.9 79,974 7,500.49 0.7 2,080 7,503.14 26.8 82,574 7,500.54 0.8 2,517 7,503.19 27.6 85,217 7,500.59 1.0 2,996 7,503.24 28.5 87,900 7,500.64 1.1 3,516 7,503.29 29.4 90,626 7,500.69 1.3 4,078 7,503.34 30.3 93,393 7,500.74 1.5 4,681 7,503.39 31.2 96,202 7,500.79 1.7 5,326 7,503.44 32.1 99,052 7,500.84 2.0 6,013 7,503.49 33.1 101,944 7,500.89 2.2 6,741 7,503.54 34.0 104,877 7,500.94 2.4 7,511 7,503.59 35.0 107,852 7,500.99 2.7 8,322 7,503.64 36.0 110,869 7,501.04 3.0 9,175 7,503.69 37.0 113,927 7,501.09 3.3 10,070 7,503.74 38.0 117,027 7,501.14 3.6 11,006 7,503.79 39.0 120,169 7,501.19 3.9 11,984 7,503.84 40.0 123,352 7,501.24 4.2 13,003 7,503.89 41.1 126,577 7,501.29 4.6 14,064 7,503.94 42.1 129,843 7,501.34 4.9 15,167 7,503.99 43.2 133,151 7,501.39 5.3 16,311 7,504.04 44.3 136,501 7,501.44 5.7 17,497 7,504.09 45.4 139,892 7,501,49 6.1 18,724 7,504.14 46.5 143,325 7,501.54 6.5 19,993 7,504.19 47.6 146,799 7,501.59 6.9 21,304 7,504.24 48.8 150,315 7,501.64 7.4 22,656 7,504.29 49.9 153,873 7,501.69 7.8 24,050 7,504.34 51.1 157,472 7,501.74 8.3 25,486 7,504.39 52.3 161,113 7,501.79 8.7 26,963 7,504.44 53.5 164,795 7,501.84 9.2 28,482 7,504,49 54.7 168,519 7,501.89 9.7 30,042 7,504.54 55.9 172,285 7,501.94 10.3 31,644 7,504.59 57.1 176,092 7,501.99 10.8 33,288 7,504.64 58.4 179,941 7,502.04 11.3 34,973 7,504.69 59.6 183,832 7,502.09 11.9 36,700 7,504.74 60.9 187,764 7,502.14 12.5 38,468 7,504.79 62.2 191,737 7,502.19 13.1 40,278 7,504.84 63.5 195,753 7,502.24 13.7 42,130 7,504.89 64.8 199,810 7,502.29 14.3 44,023 7,504.94 66.2 203,908 7,502.34 14.9 45,958 7,504.99 67.5 208,049 7,502.39 15.6 47,934 7,502.44 16.2 49,952 7,502.49 16.9 52,012 7,502.54 17.6 54,113 7,502,59 18.3 56,256 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 13 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Pond 63P: Pond L Inflow Area = 69.427 ac, Inflow Depth > 0.76" for 100 Year event Inflow = 38.50 cfs @ 12.32 hrs, Volume= 4.404 af Outflow = 2.61 cfs @ 16.29 hrs, Volume= 2.215 af, Atten= 93%, Lag= 238.1 min Primary = 2.61 cfs c@r 16.29 hrs, Volume= 2.215 of Routing by Star -Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 7,519.75' @ 16.29 hrs Surf.Area= 3.486 ac Storage= 2.584 af Plug -Flow detention time= 343.8 min calculated for 2.210 af (50% of inflow) Center -of -Mass det. time= 206.9 min ( 1,092.3 - 885.4 ) Volume Invert Avail.Storage Storage Description #1 7,519.00' 3.451 af Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre-feet) (acre-feet) 7,519.00 3.381 0.000 0.000 7,520.00 3.520 3.451 3.451 Device Routing Invert Outlet Devices #1 Primary 7,504.00' 24.0" x 250.0' long Culvert CMP, square edge headwall, Ke= 0.500 Outlet Invert= 7,501.00' S= 0.0120 '1' Cc= 0.900 n= 0.012 #2 Device 1 7,519.00' 45.0 deg x 1.0' long x 2.00' rise Sharp -Crested Vee/Trap Weir C= 2.56 Primary OutFlow Max=2.61 cfs @ 16.29 hrs HW=7,519.75' (Free Discharge) L�Culvert (Passes 2.61 cfs of 50.62 cfs potential flow) 2=Sharp-Crested VeefTrap Weir (Weir Controls 2.61 cfs @ 2.64 fps) Post -Development Type 11 24 -hr 100 Year Rainfa1J=2.70„ Prepared by Gamba & Associates, Inc. Page 14 HydroCAD® 8.00 sin 004370 U 2006 HydroCAD Software Solutions LLC 3/6/2007 42= 40= 38 36, 34= 32= 30= 28-` 26= 24 22= 0 20: 163 14 12- 10 Elevation (feet) 8 4' 2= Pond 63P: Pond L Hydrogra Ph 1 38.50 cfs j Inflow Area=69.427 ac Peak EIev=7,519.75' Storage=2.584 of 0. 2.61 cfs 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pond 63P: Pond L Stage -Discharge 0 2 3 4 7 8 9 Discharge (cfs) 10....11, . _ 1 Z... 1 3....14, , , 15 — Inflow — Primary — Primary 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 15 3/6/2007 7,521 4 Pond 63P: Pond L Stage -Area -Storage Surface/Horizontal/Wetted Area (acres) 2 0 7,520- 2 ,520 m W 7,5194 Q Storage (acre-feet) Surface II — Storage Post -Development Type II24-hr1O0Year Ra/nfall=2.70° Prepared by Gamba & Associates, Inc. Page 16 8.00HydroCAD®sin ��2OO8HydnuCAO�o0m�naSoud|unoLLC / 3/6/2007 Hydrograph for Pond 63P: Pond L Time Inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet) (cfs) 0.00 0.00 0.000 7.519.00 0.00 0.80 0.00 0.000 7.519.00 0.00 1.00 0.00 0.000 7,519.00 0.00 1.50 0.00 0.000 7.519.00 0.00 2.00 0.00 0.000 7.510.00 0.00 2.50 0.00 0.000 7,518.00 0.00 3.00 0.00 0.000 7.519.00 0.00 3.50 0.00 0.000 7.518.00 0.00 4.00 0.00 0.000 7.518.00 0.08 4.50 0.00 0.008 7'519.00 0.00 5.00 0.00 0.000 7.519.00 0.00 5.50 0.00 0.000 7.619.00 0.00 6.00 0.00 0.000 7.519.80 0.00 6.50 0.00 0.000 7.519.00 0.00 7.00 0.00 0.000 7.519.00 0.00 7.50 0.00 0.000 7.519.00 0.00 8Q0 0.80 0.000 7.519.00 0.00 8.50 0.00 0.000 7.519.00 0.00 9.00 0.00 0.000 7.519.00 0.00 9.50 0.00 0.000 7.519.00 0.00 10.00 0.00 0.000 7.519.00 0.00 10.50 0.00 0.000 7,510.00 0.00 71.00 0.00 0.008 7'510.00 0.00 11.50 0.06 0.800 7.519.00 0.00 12.00 9.68 0.081 7.519.02 0.01 12.50 30.54 1.304 7.519.38 0.85 13.00 11.05 2.013 7,519.59 1.73 13.50 6.45 2.275 7.519.88 2.11 14.00 4.78 2.410 7,519.70 2.32 14,50 3.88 2.488 7.618.73 2.45 15.00 3.46 3.536 7,519.74 2.53 15.50 3.13 2.567 7.519.75 2.58 10.00 2.80 2.502 7.519.75 2.61 16.50 2.50 2.583 7,519.75 2.61 17.00 2.35 2.575 7.519.75 2.60 17.50 2.23 2.563 7.619.75 2.58 18D0 2.10 2.547 7,519.74 2.55 18.60 1.98 2.526 7.519.74 2.51 18.00 1.86 2.503 7.519.73 2.47 19.50 1.73 2.476 7.519.72 2.43 20.00 1.60 2.445 7.519.71 2.38 30.58 1.49 2.411 7.519.70 2.33 21.00 1.44 2.377 7.619.88 2.27 21.50 1.42 2.343 7.519.88 2.22 22.00 1.40 2.311 7.519.67 2.17 22.50 1.37 2.379 7.519.67 2.12 23.00 1.35 2.249 7,519.66 2.07 23.60 1.33 2.220 7.519.85 2.03 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type II 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 17 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Stage -Discharge for Pond 63P: Pond L Elevation Primary Elevation Primary Elevation Primary Elevation Primary (feet) (cfs) (feet) (cfs) (feet) (cfs) (feet) (cfs) 7,519.00 0.00 7,519.53 1.45 7,520.06 4.72 7,520.59 9.80 7,519.01 0.00 7,519.54 1.50 7,520.07 4.80 7,520.60 9.91 7,519.02 0.01 7,519.55 1.54 7,520.08 4.88 7,520.61 10.02 7,519.03 0.02 7,519.56 1.59 7,520.09 4.96 7,520.62 10.14 7,519.04 0.03 7,519.57 1.64 7,520.10 5.04 7,520.63 10.26 7,519.05 0.04 7,519.58 1.69 7,520.11 5.12 7,520.64 10.37 7,519.06 0.05 7,519.59 1.73 7,520.12 5.20 7,520.65 10.49 7,519.07 0.06 7,519.60 1.78 7,520.13 5.28 7,520.66 10.61 7,519.08 0.07 7,519.61 1.83 7,520.14 5.37 7,520.67 10.73 7,519.09 0.09 7,519.62 1.88 7,520.15 5.45 7,520.68 10.85 7,519.10 0.10 7,519.63 1.93 7,520.16 5.53 7,520.69 10.97 7,519.11 0.12 7,519.64 1.99 7,520.17 5.62 7,520.70 11.09 7,519.12 0.14 7,519.65 2.04 7,520.18 5.71 7,520.71 11.21 7,519.13 0.16 7,519.66 2.09 7,520.19 5.79 7,520.72 11.33 7,519.14 0.18 7,519.67 2.14 7,520.20 5.88 7,520.73 11.46 7,519.15 0.20 7,519.68 2.20 7,520.21 5.97 7,520.74 11.58 7,519.16 0.22 7,519.69 2.25 7,520.22 6.06 7,520.75 11.70 7,519.17 0.24 7,519.70 2.31 7,520.23 6.14 7,520.76 11.83 7,519.18 0.26 7,519.71 2.36 7,520.24 6.23 7,520.77 11.96 7,519.19 0.28 7,519.72 2.42 7,520.25 6.32 7,520.78 12.08 7,519.20 0.31 7,519.73 2.48 7,520.26 6.42 7,520.79 12.21 7,519.21 0.33 7,519.74 2.54 7,520.27 6.51 7,520.80 12.34 7,519.22 0.35 7,519.75 2.60 7,520.28 6.60 7,520.81 12.47 7,519.23 0.38 7,519.76 2.65 7,520.29 6.69 7,520.82 12.60 7,519.24 0.41 7,519.77 2.71 7,520.30 6.79 7,520.83 12.73 7,519.25 0.43 7,519.78 2.77 7,520.31 6.88 7,520.84 12.86 7,519.26 0.46 7,519.79 2.84 7,520.32 6.98 7,520.85 12.99 7,519.27 0.49 7,519.80 2.90 7,520.33 7.07 7,520.86 13.12 7,519.28 0.52 7,519.81 2.96 7,520.34 7.17 7,520.87 13.25 7,519.29 0.55 7,519.82 3.02 7,520.35 7.26 7,520.88 13.39 7,519.30 0.58 7,519.83 3.09 7,520.36 7.36 7,520.89 13.52 7,519.31 0.61 7,519.84 3.15 7,520.37 7.46 7,520.90 13.66 7,519.32 0.64 7,519.85 3.21 7,520.38 7.56 7,520.91 13.79 7,519.33 0.67 7,519.86 3.28 7,520.39 7.66 7,520.92 13.93 7,519.34 0.71 7,519.87 3.35 7,520.40 7.76 7,520.93 14.07 7,519.35 0.74 7,519.88 3.41 7,520.41 7.86 7,520.94 14.21 7,519.36 0.77 7,519.89 3.48 7,520.42 7.96 7,520.95 14.34 7,519.37 0.81 7,519.90 3.55 7,520.43 8.07 7,520.96 14.48 7,519.38 0.84 7,519.91 3.62 7,520.44 8.17 7,520.97 14.62 7,519.39 0.88 7,519.92 3.68 7,520.45 8.27 7,520.98 14.77 7,519.40 0.92 7,519.93 3.75 7,520.46 8.38 7,520.99 14.91 7,519.41 0.95 7,519.94 3.82 7,520.47 8.48 7,521.00 15.05 7,519.42 0.99 7,519.95 3.90 7,520.48 8.59 7,519.43 1.03 7,519.96 3.97 7,520.49 8.69 7,519.44 1.07 7,519.97 4.04 7,520.50 8.80 7,519.45 1.11 7,519.98 4.11 7,520.51 8.91 7,519.46 1.15 7,519.99 4.19 7,520.52 9.02 7,519.47 1.19 7,520.00 4.26 7,520.53 9.13 7,519.48 1.23 7,520.01 4.34 7,520,54 9.24 7,519.49 1.28 7,520.02 4.41 7,520.55 9.35 7,519.50 1.32 7,520.03 4.49 7,520.56 9.46 7,519.51 1.36 7,520.04 4.56 7,520.57 9.57 7,519.52 1.41 7,520.05 4.64 7,520.58 9.68 Post -Development Type 11 24 -hr 100 Year RainfaII=2.70„ Prepared by Gamba & Associates, Inc. Page 18 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Stage -Area -Storage for Pond 63P: Pond L Elevation Surface Storage Elevation Surface Storage (feet) (acres) (acre-feet) (feel) (acres) (acre-feet) 3.381 0.000 7,520.06 3.520 3.451 3.384 0.068 7,520.08 3.520 3.451 3.387 0.135 7,520.10 3.520 3.451 3.389 0.203 7,520.12 3.520 3.451 3.392 0.271 7,520.14 3.520 3.451 3.395 0.339 7,520.16 3.520 3.451 3.398 0.407 7,520.18 3.520 3.451 3.400 0.475 7,520.20 3.520 3.451 3.403 0.543 7,520.22 3.520 3.451 3.406 0.611 7,520.24 3.520 3.451 3.409 0.679 7,520.26 3.520 3.451 3.412 0.747 7,520.28 3.520 3.451 3.414 0.815 7,520.30 3.520 3.451 3.417 0.884 7,520.32 3.520 3.451 3.420 0.952 7,520.34 3.520 3.451 3.423 1.021 7,520.36 3.520 3.451 3.425 1.089 7,520.38 3.520 3.451 3.428 1.158 7,520.40 3.520 3.451 3.431 1.226 7,520.42 3.520 3.451 3.434 1.295 7,520.44 3.520 3.451 3.437 1.364 7,520.46 3.520 3.451 3.439 1.432 7,520.48 3.520 3.451 3.442 1.501 7,520.50 3.520 3.451 3.445 1.570 7,520.52 3.520 3.451 3.448 1.639 7,520.54 3.520 3.451 3.451 1.708 7,520.56 3.520 3.451 3.453 1.777 7,520.58 3.520 3.451 3.456 1.846 7,520.60 3.520 3.451 3.459 1.915 7,520.62 3.520 3.451 3.462 1.984 7,520.64 3.520 3.451 3.464 2.054 7,520.66 3.520 3.451 3.467 2.123 7,520.68 3.520 3.451 3.470 2.192 7,520.70 3.520 3.451 3.473 2.262 7,520.72 3.520 3.451 3.476 2.331 7,520.74 3.520 3.451 3.478 2.401 7,520.76 3.520 3.451 3.481 2.470 7,520.78 3.520 3.451 3,484 2.540 7,520.80 3.520 3.451 3.487 2.610 7,520.82 3.520 3.451 3.489 2.679 7,520.84 3.520 3.451 3.492 2.749 7,520.86 3.520 3.451 3.495 2,819 7,520.88 3.520 3.451 3.498 2.889 7,520.90 3.520 3.451 3.501 2.959 7,520.92 3.520 3.451 3.503 3.029 7,520.94 3.520 3.451 3.506 3.099 7,520.96 3.520 3.451 3.509 3.169 7,520.98 3.520 3.451 3.512 3.240 7,521.00 3.520 3.451 7,519.00 7,519.02 7,519.04 7,519.06 7,519.08 7,519.10 7,519.12 7,519.14 7,519.16 7,519.18 7,519.20 7,519.22 7,519.24 7,519.26 7,519.28 7,519.30 7,519.32 7,519.34 7,519.36 7,519.38 7,519.40 7,519.42 7,519.44 7,519.46 7,519.48 7,519.50 7,519.52 7,519.54 7,519.56 7,519.58 7,519.60 7,519.62 7,519.64 7,519.66 7,519.68 7,519.70 7,519.72. 7,519.74 7,519.76 7,519.78 7,519.80 7,519.82 7,519.84 7,519.86 7,519.88 7,519.90 7,519.92 7,519.94 7,519.96 7,519.98 7,520.00 7,520.02 7,520.04 3.514 3.310 3.517 3.380 3.520 3.451 3.520 3.451 3.520 3.451 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 — inflow — Primary 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 19 HydroCADO 8070 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Link 64L: L Outfall Inflow Area = 193.220 ac, Inflow Depth > 0.51" for 100 Year event Inflow = 47.19 cfs @ 12.35 hrs, Volume= 8.213 of Primary = 47.19 cfs @ 12.35 hrs, Volume= 8.213 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 64L: L Outfall Hydrograph 52 50= 48 46 44= 42 40= 38- 36 34 32- .) 30 8. 28- 26= 24:. �` 22 201 18 16= 14- 12 10. 81 6•� 1 47.19 cfs l Inflow Area=193.220 ac 21 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Time (hours) 20 21 22 23 24 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 20 3/612007 Hydrograph for Link 64L: L Outfall Time Inflow Elevation Primary Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 13.25 13.49 0.00 13.49 0.25 0.00 0.00 0.00 13.50 11.48 0.00 11.48 0.50 0.00 0.00 0.00 13.75 10.23 0.00 10.23 0.75 0.00 0.00 0.00 14.00 9.34 0.00 9.34 1.00 0.00 0.00 0.00 14.25 8.68 0.00 8.68 1.25 0.00 0.00 0.00 14.50 8.19 0.00 8.19 1.50 0.00 0.00 0.00 14.75 7.89 0.00 7.89 1.75 0.00 0.00 0.00 15.00 7.67 0.00 7.67 2.00 0.00 0.00 0.00 15.25 7.47 0.00 7.47 2.25 0.00 0.00 0.00 15.50 7.27 0.00 7.27 2.50 0.00 0.00 0.00 15.75 7.05 0.00 7.05 2.75 0.00 0.00 0.00 16.00 6.82 0.00 6.82 3.00 0.00 0.00 0.00 16.25 6.59 0.00 6.59 3.25 0.00 0.00 0.00 16.50 6.39 0.00 6.39 3.50 0.00 0.00 0.00 16.75 6.26 0.00 6.26 3.75 0.00 0.00 0.00 17.00 6.15 0.00 6.15 4.00 0.00 0.00 0.00 17.25 6.06 0.00 6.06 4.25 0.00 0.00 0.00 17.50 5.96 0.00 5.96 4.50 0.00 0.00 0.00 17.75 5.86 0.00 5.86 4.75 0.00 0.00 0.00 18.00 5.76 0.00 5.76 5.00 0.00 0.00 0.00 18.25 5.66 0.00 5.66 5.25 0.00 0.00 0.00 18.50 5.55 0.00 5.55 5.50 0.00 0.00 0,00 18.75 5.44 0,00 5.44 5.75 0.00 0.00 0.00 19.00 5.33 0.00 5.33 6.00 0.00 0.00 0.00 19.25 5,22 0.00 5.22 6.25 0.00 0.00 0.00 19.50 5.10 0.00 5.10 6.50 0.00 0.00 0.00 19.75 4.98 0.00 4.98 6.75 0.00 0.00 0.00 20.00 4.86 0.00 4.86 7.00 0.00 0.00 0.00 20.25 4.73 0.00 4.73 7.25 0.00 0.00 0.00 20.50 4.63 0.00 4.63 7.50 0.00 0.00 0.00 20.75 4.56 0.00 4.56 715 0.00 0.00 0.00 21.00 4.51 0.00 4.51 8.00 0.00 0.00 0.00 21.25 4.46 0.00 4.46 8.25 0.00 0.00 0.00 21.50 4.42 0.00 4.42 8.50 0.00 0.00 0.00 21.75 4.38 0.00 4.38 8.75 0.00 0.00 0.00 22.00 4.34 0.00 4.34 9.00 0.00 0.00 0.00 22.25 4.30 0.00 4.30 9.25 0.00 0.00 0.00 22.50 4.25 0.00 4.25 9.50 0.00 0.00 0.00 22.75 4.21 0.00 4.21 9,75 0.00 0.00 0.00 23.00 4.17 0.00 4.17 10.00 0.00 0.00 0.00 23.25 4.13 0.00 4.13 10.25 0.00 0.00 0.00 23.50 4.09 0.00 4.09 10.50 0.00 0.00 0.00 23.75 4.05 0.00 4.05 10.75 0.00 0.00 0.00 24.00 4.01 0.00 4.01 11.00 0.00 0.00 0.00 11.25 0.00 0,00 0.00 11.50 0.00 0.00 0.00 11.75 0.07 0.00 0.07 12.00 7.84 0.00 7.84 12.25 42.66 0.00 42.66 12.50 40.60 0.00 40.60 12.75 25.02 0.00 25.02 13.00 17.26 0.00 17.26 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Subca Reach, 27S Area M PRE Link Drainage Diagram for Pre -Development Prepared by Gamba & Associates, Inc. 3/612007 HydroCADO 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Pre -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 s/n 004370 0 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 19.905 56 Brush, Fair, HSG B (27S) 233.541 70 Brush, Fair, HSG C (27S) 7.996 71 Meadow, non -grazed, HSG C (27S) 30.571 79 Pasture/grassland/range, Fair, HSG C (27S) 292.013 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Prepared by Gamba & Associates, Inc, HydroCAD® 8.00 sin 004370 ® 2006 HydroCAD Software Solutions LLC Time span=5.00-24.00 hrs, dt=0.05 hrs, 381 points Runoff by SCS TR -20 method, UH= SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 27S: Area M Runoff Area=292013 ac Runoff Depth>0.54" Flow Length= -5,184' Tc=62.4 min CN=70 Runoff=65.24 cfs 13.131 af Total Runoff Area = 292.013 ac Runoff Volume = 13.131 af Average Runoff Depth = 0.54" 100.00% Pervious Area = 292.013 ac 0.00% Impervious Area = 0.000 ac Type 11 24 -hr 100 YEAR Rainfall=2.70" Page 3 3/6/2007 Pre -Development Type 11 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, inc. Page 4 HydroCAD® 8,00 sin 004370 © 2006 HydroCAD Software Solutions LLC 316/2007 Subcatchment 27S: Area M Runoff = 65.24 cfs @ 12.76 hrs, Volume= 13.131 af, Depth> 0.54" Runoff by SCS TR -20 method, UH=SGS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type 1124 -hr 100 YEAR Rainfall=2.70" Area (ac) CN Description 19.905 56 Brush, Fair, HSG B 233.541 70 Brush, Fair, HSG C 30.571 79 Pasture/grassland/range, Fair, HSG C 7.996 71 Meadow, non -grazed, HSG C 292.013 70 Weighted Average 292.013 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 39.0 100 0.0139 0.04 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 3.9 1,089 0.0832 4.64 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 19.5 3,995 0.1439 3.41 5.46 Channel Flow, Area= 1.6 sf Perim= 20.7' r= 0.08' n= 0.030 62.4 5,184 Total Subcatchment 27S: Area M Hydrograph 70- 65 60- 55-- 50 45= . 40- 307 25 20 15 10- 5- 165.24 as Type 11 24 -hr 100 YEAR Rainfall=2.70.. Runoff Area=292.013 ac Runoff Volume=13.131 af Runoff Depth>0.54" Flow Length=5,184' Tc=62.4 min CN=70 5 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runo 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Prepared ~ Gamba & Associates, Inc, 8.00 sin Hydro .��A�a~8� .u Time Precip. Excess U�num) (inches) (inches) 5l0 0.17 0.00 5.25 0.18 0.00 5.50 0.18 8.00 5.75 0.20 0l0 8.00 0.22 0.00 6.25 0.23 0.00 8.60 0.24 0.00 6.75 0.25 0.00 7.00 0.27 0.00 7.25 0.28 0.00 7.50 0.29 0.08 7.75 0.31 0,00 8.00 0.32 0.00 8.25 0.34 0.00 8.50 0.36 0.00 8.75 0.38 0.00 9.00 0.40 0.00 9.25 0.42 0.00 9.50 0.44 0.00 9.75 0.48 0.00 10.00 0.49 0.00 10.25 0.52 0.00 10.60 0.55 0.00 10.75 0.59 8.00 11.00 0.68 0.00 11.26 0.89 0.00 11.50 0.78 0.00 11.75 1.04 0.01 12.00 1J9 0.17 12.25 1.91 0.21 12.50 1.98 0.23 12.75 2.04 0.26 13.80 2.08 0.27 13.25 2.12 0.29 13.50 2.16 0.30 13.75 2]9 0.32 14.00 2.21 0.33 14.25 2.24 0.34 14.50 2.26 0.35 14.75 2.28 0.38 15.00 2.30 0.37 15.25 2.32 0.37 15.50 2.34 0.38 15.75 2.36 0.39 10.00 2.38 0.40 16.25 2.39 0.40 16.50 2.41 0.41 16.75 2.42 0.42 17.08 2.43 0.42 17.25 2.45 0.43 17.50 2.46 0.44 17.75 2.47 0.44 18.00 2.49 0.45 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 2.28 20.91 52.66 65.23 57.64 43.55 33.93 27.21 22.52 19.17 16.68 14.82 13.50 12.49 11.69 11.07 10.49 9.92 9.38 8,91 8.54 8.25 8.00 7.78 7.58 Time (hours) 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22,00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Precip. (inches) 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58 2.59 2.60 2.60 2.61 2.62 2.63 2.64 2.65 2.65 2.66 2.67 2.68 2.68 2.69 2.70 Type 11 24 -hr 100 YEAR Rainfal1=2.70" Page 5 3/6/2007 Excess (inches) 0.45 0.46 0.47 0.47 0.48 0.48 0.48 0.49 0.49 0.50 0.50 0.51 0.51 0.51 0.52 0.52 0.53 0.53 0.53 0.54 0.54 0.55 0.55 0.55 Runoff (dn\ 7.38 7.18 6.97 6.76 6.55 6.35 6.14 5.92 5.69 5.48 5.31 5,18 5.09 5.02 4.97 4.93 4.89 4.85 4.81 4.77 4.74 4.70 4.66 4.62 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 S u boa (18S Area M V Area M-Bypaond-M ( eservoir hidde lake) Reach Link 62L M -Outfall Drainage Diagram for Post -Development Prepared by Garnba & Associates, Inc. 3/6/2007 HydroCAD® 8.00 sin 004370 Q 2006 HydroCAD Software Solutions LLC 1 Post -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) 1 Area (acres) CN Description (subcats) 19.945 56 Brush, Fair, HSG B (56S) 0.622 57 Oaklaspen range, Fair, HSG C (18S) 142.733 70 Brush, Fair, HSG C (18S,56S) 4.509 71 Meadow, non -grazed, HSG C (18S) 29.933 74 >75% Grass cover, Good, HSG C (18S,56S) 16.965 79 Pasture/grassland/range, Fair, HSG C (18S) 16.989 98 Paved parking & roofs (18S,56S) 231.696 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. HydroCADO 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 3 3/6/2007 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Star-Ind+Trans method - Pond routing by Stor-lnd method Subcatchment 18S: Area M Runoff Area=152.349 ac Runoff Depth>0.72" Flow Length=1,801' Subcatchment 56S: Area M -Bypass Flow Length=3,115" Tc=30.1 min CN=74 Runoff=83.96 cfs 9.091 af Runoff Area=79.347 ac Runoff Depth>0.47" Tc=30.9 min CN=68 Runoff=23.75 cfs 3.122 af Pond 61P: Pond -M (Reservoir hidden lakePeak Elev=7,599.99' Storage=3.098 af Inflow=83.96 cfs 9.091 af Out low=23.97 cfs 8.203 af Link 62L: M -Outfall Inflow=35.44 cfs 11.325 af Primary=36.44 cfs 11.325 af Total Runoff Area = 231.696 ac Runoff Volume = 12.213 af Average Runoff Depth = 0.63" 92.67% Pervious Area = 214.707 ac 7.33% Impervious Area = 16.989 ac Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 4 HydroCADQ 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 316/2007 Subcatchment 18S: Area M Runoff = 83.96 cfs @ 12.28 hrs, Volume= 9.091 af, Depths 0.72" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 Year Rainfall=2.70" Area (ac} CN Description 0.622 57 Oak/aspen range, Fair, HSG C 86.802 70 Brush, Fair, HSG C 16.965 79 Pasture/grassland/range, Fair, HSG C 4.509 71 Meadow, non -grazed, HSG C 29.474 74 >75% Grass cover, Good, HSG C 13.977 98 Paved parking & roofs 152.349 74 Weighted Average 138.372 Pervious Area 13.977 Impervious Area Tc Length Slope Velocity Capacity Description min feet tuft ftlsec cfs 25.9 100 0.0139 0.06 Sheet Flow, Grass: Dense n= 0.240 P2= 1.30" 1.3 453 0.1315 5.84 Shallow Concentrated Flow, Unpaved Kv- 16.1 fps 1.3 452 0.0157 5.74 45.90 Channel Flow, Area= 8.0 sf Perim= 9.0' r= 0.89' n= 0.030 1.3 451 0.1250 5.69 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.3 345 0.1311 16.58 132.64 Channel Flow, Area= 8.0 sf Perim= 9.0' r= 0.89' n= 0.030 Earth, grassed & winding 30.1 1,801 Total 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70 Prepared by Gamba & Associates, Inc. Page 5 HydroCAD® 8.00 s/n 004370 C7 2006 HydroCAD Software Solutions LLC 316/2007 Subcatchment 18S: Area M Hydrograph 90 85 807 75 70- 65 60- 55 ... 50- _0 45= II 401: 35= 30- 25 20 15- 10. 5-= 0 183.96 cfs l Type 11 24 -hr 100 Year Rainfall=2.70" Runoff Area=1 52.349 ac Runoff Volume=9.091 of Runoff Depth>0.72" Flow Length=1,801' Tc=30.1 min CN=74 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 6 HydroCADO 8.00 sin 004370 © 2006 HydroCAD Software Solu#ions LLC 3/612007 Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.25 0,01 0.00 0.50 0.01 0.00 0.75 0.02 0.00 1.00 0.03 0.00 1.25 0.04 0.00 1.50 0.04 0.00 1.75 0.05 0.00 2.00 0.06 0,00 2.25 0.07 0.00 2.50 0.08 0.00 2.75 0.08 0.00 3.00 0.09 0.00 3.25 0.10 0.00 3.50 0.11 0.00 3.75 0.12 0.00 4.00 0.13 0.00 4.25 0.14 0.00 4.50 0.15 0.00 4.75 0.16 0.00 5.00 0.17 0.00 5.25 0.18 0.00 5.50 0.19 0.00 5.75 0.20 0.00 6.00 0.22 0.00 6.25 0.23 0.00 6.50 0.24 0.00 6.75 0.25 0.00 7.00 0.27 0.00 7.25 0.28 0.00 7.50 0.29 0.00 7.75 0.31 0.00 8.00 0.32 0.00 8.25 0.34 0.00 8.50 0.36 0.00 8.75 0.38 0.00 9.00 0.40 0.00 9.25 0.42 0.00 9.50 0.44 0.00 9.75 0.46 0.00 10.00 0.49 0.00 10.25 0.52 0.00 10.50 0.55 0.00 10.75 0.59 0.00 11.00 0.63 0.00 11.25 0.69 0,00 11.50 0.76 0.00 11.75 1.04 0.03 12.00 1.79 0.26 12.25 1.91 0.31 12.50 1.98 0.34 12.75 2.04 0.37 13.00 2.08 0.39 Hydrograph for Subcatchment 18S: Area M Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 1.25 24.15 83.44 56.62 31.84 20.56 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 13.25 2.12 0.41 15.50 13.50 2,16 0.43 12.72 13.75 2.19 0.44 10.98 14.00 2.21 0.45 9.74 14.25 2.24 0.47 8.72 14.50 2.26 0.48 8.00 14.75 2.28 0.49 7.55 15.00 2.30 0.50 7.19 15.25 2.32 0.51 6.86 15.50 2.34 0.52 6.52 15.75 2.36 0.53 6.18 16.00 2.38 0.54 5.83 16.25 2.39 0.55 5.48 16.50 2.41 0.56 5.22 16.75 2.42 0.56 5.05 17.00 2.43 0.57 4.92 17.25 2.45 0.58 4.79 17.50 2.46 0.59 4.67 17.75 2.47 0.59 4.55 18.00 2.49 0.60 4.42 18.25 2.50 0.61 4.29 18.50 2.51 0.61 4.16 18.75 2.52 0.62 4.03 19.00 2.53 0.63 3.90 19.25 2.54 0.63 3.76 19.50 2.55 0.64 3.63 19.75 2.56 0,64 3.49 20.00 2.57 0.65 3.35 20.25 2.58 0.65 3.22 20.50 2.59 0.66 3.12 20.75 2.60 0.66 3.08 21.00 2.60 0.67 3.05 21.25 2.61 0.67 3.02 21.50 2.62 0.68 3.00 21.75 2.63 0.68 2.98 22.00 2.64 0.69 2.95 22.25 2.65 0.69 2.93 22.50 2.65 0,70 2.90 22.75 2.66 0.70 2.88 23.00 2.67 0.71 2.86 23.25 2.68 0.71 2.83 23.50 2.68 0.71 2.81 23.75 2.69 0.72 2.78 24.00 2.70 0.72 2.76 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 7 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 56S: Area M -Bypass Runoff = 23.75 cls @ 12.32 hrs, Volume= 3.122 af, Depth> 0.47" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type 11 24 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 19.945 56 Brush, Fair, HSG B 55.931 70 Brush, Fair, HSG C 0.459 74 >75% Grass cover, Good, HSG C 3.012 98 Paved parking & roofs 79.347 68 Weighted Average 76.335 Pervious Area 3.012 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ftift) (ft/sec) (cfs) 19.7 100 0.0274 0.08 Sheet Flow, Grass: Dense n= 0.240 P2= 1.30" 0.5 91 0.0376 3.12 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.7 208 0.0135 5.32 42.57 Channel Flow, Area= 8.0 sf Perim= 9.0' r= 0.89' n= 0.030 2.4 881 0.1389 6.00 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 7.6 1,835 0.1988 4.01 6.41 Channel Flow,. Area= 1.6 sf Perim= 20.7' r= 0.08' n= 0.030 30.9 3,115 Total Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 8 3/6/2007 26= 25 24- 23- 22 21 20, 19 18-J 17= 16- v 15-' 14- 13; LL 12- 11= 104 73 6 5 4 3 2 0r Subcatchment 56S: Area M -Bypass Hydrograph 23.75 cfs Type 1124 -hr 100 Year Rai nfall=2.70" Runoff Area=79.347 ac Runoff Volume=3.122 of Runoff Depth}0.47" Flow Length=3,115' Tc=30.9*+min 'C N =68 0 • t----r-.� 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Time (hours) 16 17 8 19 20 21 22 23 24 — Runoff 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 O 2006 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 565: Area M -Bypass Type 1124 -hr 100 Year Rainfall=2.70" Page 9 3/612007 Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.25 0.01 0.00 0.50 0.01 0.00 0.75 0.02 0.00 1.00 0.03 0.00 1.25 0.04 0.00 1.50 0.04 0.00 1.75 0.05 0.00 2.00 0.06 0.00 2.25 0.07 0.00 2.50 0.08 0.00 2.75 0.08 0.00 3.00 0.09 0.00 3.25 0.10 0.00 3.50 0.11 0.00 3.75 0.12 0.00 4.00 0.13 0.00 4.25 0.14 0.00 4.50 0.15 0.00 4.75 0.16 0.00 5.00 0.17 0.00 5.25 0.18 0.00 5.50 0.19 0.00 5.75 0.20 0.00 6.00 0.22 0.00 6.25 0.23 0.00 6.50 0.24 0.00 6.75 0.25 0.00 7.00 0.27 0.00 7.25 0.28 0.00 7.50 0.29 0.00 7.75 0.31 0.00 8.00 0.32 0.00 8.25 0.34 0.00 8.50 0.36 0.00 8.75 0.38 0.00 9.00 0.40 0.00 9.25 0.42 0.00 9.50 0.44 0.00 9.75 0.46 0.00 10.00 0.49 0.00 10.25 0.52 0.00 10.50 0.55 0.00 10.75 0.59 0.00 11.00 0.63 0.00 11.25 0.69 0.00 11.50 0.76 0.00 11.75 1.04 0.00 12.00 1.79 0.13 12.25 1.91 0.16 12.50 1.98 0.19 12.75 2.04 0.21 13.00 2.08 0.22 Runoff Time Precip. Excess Runoff (cfs) (hours) (inches) (inches) (cfs) 0.00 13.25 2.12 0.24 5.82 0.00 13.50 2.16 0.25 4.86 0.00 13.75 2.19 0.26 4.22 0.00 14.00 2.21 0.27 3.76 0.00 14.25 2.24 0.28 3.39 0.00 14.50 2.26 0.29 3.11 0.00 14.75 2.28 0.30 2.95 0.00 15.00 2.30 0.31 2.82 0.00 15.25 2.32 0.31 2.69 0.00 15.50 2.34 0.32 2.57 0.00 15.75 2.36 0.33 2.44 0.00 16.00 2.38 0.34 2.31 0.00 16.25 2.39 0.34 2.18 0.00 16.50 2.41 0.35 2.08 0.00 16.75 2.42 0.35 2.01 0.00 17.00 2.43 0.36 1.96 0.00 17.25 2.45 0.37 1.92 0.00 17.50 2.46 0.37 1.87 0.00 17.75 2.47 0.38 1.83 0.00 18.00 2.49 0.38 1.78 0.00 18.25 2.50 0.39 1.73 0.00 18.50 2,51 0.39 1.68 0.00 18.75 2.52 0.40 1.63 0.00 19.00 2.53 0.40 1.58 0.00 19.25 2.54 0.41 1.53 0.00 19.50 2.55 0.41 1.47 0.00 19.75 2.56 0.41 1.42 0.00 20.00 2.57 0.42 1.36 0.00 20.25 2.58 0.42 1.31 0.00 20.50 2.59 0.43 1.27 0.00 20.75 2.60 0.43 1.25 0.00 21.00 2.60 0.43 1.24 0.00 21.25 2.61 0.44 1.23 0.00 21.50 2.62 0.44 1.23 0.00 21.75 2.63 0.45 1.22 0.00 22.00 2.64 0.45 1.21 0.00 22.25 2.65 0.45 1.20 0.00 22.50 2.65 0.46 1.19 0.00 22.75 2.66 0.46 1.18 0.00 23.00 2.67 0.46 1.17 0.00 23.25 2.68 0.47 1.16 0.00 23.50 2.68 0.47 1.15 0.00 23.75 2.69 0.48 1.14 0.00 24.00 2.70 0.48 1.14 0.00 0.00 0.00 0.00 3.62 22.57 18.35 11.12 7.53 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 C) 2006 HydroCAD Software Solutions LLC Type 1124 -hr 100 Year Rainfall=2.70" Page 10 3/6/2007 Inflow Area = Inflow = Outflow Primary = Pond 61P: Pond -M (Reservoir hidden lake) 152.349 ac, Inflow Depth > 0.72" for 100 Year event 83.96 cfs @ 12.28 hrs, Volume= 9.091 af 23.97 cfs © 12.90 hrs, Volume= 8.203 af, Atten= 23.97 cfs @ 12.90 hrs, Volume= 8.203 af 71%, Lag= 37.7 min Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 7,599.99' © 12.90 hrs Surf.Area= 2.190 ac Storage= 3.098 af Plug -Flow detention time= 122.9 min calculated for 8.186 af (90% of inflow) Center -of -Mass det. time= 75.2 min ( 961.8 - 886.6 ) Volume Invert Avail.Stora•e Stora•e Descri•tion #1 7,598.50' 3.109 af Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre-feet) _ (acre-feet) 7,598.50 1.954 0.000 0.000 7,600.00 2.191 3.109 3.109 Device Routing Invert Outlet Devices #1 Primary 7,590.00' 240 x 100.0' long Culvert CMP, square edge headwall, Ke= 0.500 Outlet Invert= 7,588.00' S= 0.0200 '1' Cc= 0,900 n= 0.012 #2 Device 1 7,598.50' 90.0 deg x 3.0' long x 1.50' rise Sharp -Crested VeelTrap Weir C= 2.50 Primary OutFlow Max=23.96 cfs @ 12.90 hrs HW=7,599.99' (Free Discharge) =Culvert (Passes 23.96 cfs of 45.37 cfs potential flow) 2=Sharp-Crested Vee/Trap Weir (Weir Controls 23.96 cfs @ 3.57 fps) 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -development Type 11 24 -hr 100 Year Rainfal1=2.713" Prepared by Gamba & Associates, inc. Page 11 HydroCAD4 8.00 sin 004370 d 2006 HydroCAD Software Solutions LLC 3/6/2007 Pond 61P: Pond -M (Reservoir hidden lake) 0 LL Elevation (feet) 90- 85= 80- 75- 70-' 65 60 55= 50- 45- 40 35- 25- 20 152 10 53 Hydrograph 83.96 c Inflow Area=152.349 ac Peak EIev=7,599.99' Storage=3.098 of 0 1 2 3 4 5 6 7 8 9 10 11 12 li 14 15 16 17 18 19 20 21 22 23 Time (hours) 7,800 Pond 61P: Pond -M (Reservoir hidden lake) Stage -Discharge 7.599- 4 8 10 12 14 16 18 20 22 24 Discharge {cfs) Inflow Primary — Primary — Surface Storage Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® $.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 12 3/6/2007 Elevation (feet) 0 Pond 61P: Pond -M (Reservoir hidden lake) Stage -Area -Storage SurfacelliorizontatfWetted Area (acres) 1 Storage (acre-feet) 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Type ���-�yf��\��y 70" ��M��������������FO����� '`~^~^ - 13 [» Prepared (�8Onha<�Associates, Inc. Page H'�p" 8.00 sin 004370 ©2O06HydroCADSoftware Solutions LLC 3H8/2007 Hydrograph for Pond 61P: Pond -M (Reservoir hidden lake) Time inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet) (cfs) 0.00 0.00 0.000 7,598.50 0.00 0.60 0.00 0.000 7.598.50 0.00 1.00 8.08 0.000 7,598.50 0.00 1.50 0.00 0.008 7.598.50 0.08 3.00 0.00 0.000 7.598.60 0.00 2.60 8.00 0.080 7.698.50 0.00 3.00 0.00 0.000 7.588.50 0.00 3.50 0.00 0.000 7.588.50 0.00 4.00 0.00 0.000 7.598.50 0.80 4.50 0.00 0.000 7.598.50 0.00 5.00 0.00 0.000 7.588.60 0.00 5.50 0.00 0.000 7.598.50 0.00 6.00 0.00 0.008 7.598.50 0.00 6.50 8.00 0.000 7.508.50 0.00 7.00 0.00 0D00 7.598.50 8.00 7.50 0.00 8.000 7.698.50 0.00 8.00 0.00 0.000 7.598.50 0.00 8.60 0.00 0.000 7,598.50 0.00 9.00 0.80 0.000 7.598.50 0.00 9.50 0.00 0.000 7.508.50 0.00 10.00 0 0 8.000 7.598.50 0.00 10.50 0.00 0.000 7.598.50 0.00 11.00 0.00 0.000 7.598.60 0.00 11.50 0.03 0.000 7.598.50 0.00 12.00 24.15 0.181 7.598.58 0.27 12.50 56.62 2.608 7.599.77 17.96 13.00 20.56 3.083 7,599.99 23.78 13.50 12.72 2.819 7,599.87 20.45 14.00 9.74 2.508 7.590.72 16.82 14.50 8.00 2.238 7.599.60 13.92 15.00 7.19 2.032 7.689.49 11.77 15.50 6.52 1.853 7.599.41 10.28 19D0 5.83 1.713 7.500.35 8.97 16.50 5.22 1.591 7.599.29 7.90 17.00 4.92 1.489 7,599.24 7.14 17.50 4.67 1.405 7.590.20 6.51 18.00 4.42 1.335 7.599.17 5.99 18.50 4.16 1.274 7.598.14 5.58 19.00 3.90 1.219 7.599.11 5.18 19.50 3.63 1.168 7.509.88 4.83 20.00 3.35 1.119 7.699.06 4.52 20.50 3.12 1.072 7.599.04 4.22 21.00 3.05 1.030 7.599.02 3.96 21.50 3.00 0.998 7.599.00 3.75 23.00 2.95 0.968 7^598.99 3.58 22.50 2.90 0.944 7^598.97 3.44 23.00 2.86 0.923 7,598.96 3.32 23.50 2.81 0.904 7.598.95 3.22 24.00 2.76 0.888 7.598.85 3.13 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sln 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 14 3/6/2007 Stage -Discharge for Pond 61P: Pond -M (Reservoir hidden lake) Elevation Primary Elevation Primary Elevation Primary (feet) (cfs) (feet) (cfs) (feet) (cfs) 7,598.50 0.00 7,599.03 4.13 7,599.56 13,12 7,598.51 0.01 7,599.04 4.26 7,599.57 13.34 7,598.52 0.03 7,599.05 4.38 7,599.58 13.55 7,598.53 0.05 7,599.06 4.52 7,599.59 13.77 7,598.54 0.08 7,599.07 4.65 7,599.60 13.99 7,598.55 0.11 7,599.08 4.78 7,599.61 14.21 7,598.56 0.14 7,599.09 4.92 7,599.62 14.43 7,598.57 0.18 7,599.10 5.05 7,599.63 14.65 7,598.58 0.22 7,599.11 5.19 7,599.64 14.88 7,598.59 0.26 7,599.12 5.33 7,599.65 15.11 7,598.60 0.30 7,599.13 5.48 7,599.66 15.34 7,598.61 0.35 7,599.14 5.62 7,599.67 15.57 7,598.62 0.40 7,599.15 5.76 7,599.68 15.80 7,598.63 0.45 7,599.16 5.91 7,599.69 16.03 7,598.64 0.51 7,599.17 6.06 7,599.70 16.27 7,598.65 0.57 7,599.18 6.21 7,599.71 16.50 7,598.66 0.63 7,599.19 6.36 7,599.72 16.74 7,598.67 0.69 7,599.20 6.52 7,599.73 16.98 7,598.68 0.75 7,599.21 6.67 7,599.74 17.23 7,598.69 0.82 7,599.22 6.83 7,599.75 17.47 7,598.70 0.88 7,599.23 6.99 7,599.76 17.71 7,598.71 0.95 7,599.24 7.15 7,599.77 17.96 7,598.72 1.02 7,599.25 7.31 7,599.78 18.21 7,598.73 1.10 7,599.26 7.47 7,599.79 18.46 7,598.74 1.17 7,599.27 7.64 7,599.80 18.71 7,598.75 1.25 7,599.28 7.80 7,599.81 18.97 7,598.76 1.33 7,599.29 7.97 7,599.82 19.22 7,598.77 1.41 7,599.30 8.14 7,599.83 19.48 7,598.78 1.49 7,599.31 8.31 7,599.84 19.74 7,598.79 1.58 7,599.32 8.48 7,599.85 20.00 7,598.80 1.66 7,599.33 8.66 7,599.86 20.26 7,598.81 1.75 7,599.34 8.83 7,599.87 20.53 7,598.82 1.84 7,599.35 9.01 7,599.88 20.79 7,598.83 1.93 7,599.36 9.19 7,599.89 21.06 7,598.84 2.03 7,599.37 9.37 7,599.90 21.33 7,598.85 2.12 7,599.38 9.56 7,599.91 21.60 7,598.86 2.22 7,599.39 9.74 7,599.92 21.87 7,598.87 2.32 7,599.40 9.93 7,599.93 22.14 7,598.88 2.42 7,599.41 10.11 7,599.94 22.42 7,598.89 2.52 7,599.42 10.30 7,599.95 22.70 7,598.90 2.62 7,599.43 10.49 7,599.96 22,98 7,598.91 2.73 7,599.44 10.69 7,599.97 23.26 7,598.92 2.84 7,599.45 10,88 7,599.98 23.54 7,598.93 2.95 7,599.46 11.08 7,599.99 23.83 7,598.94 3.06 7,599.47 11.27 7,600.00 24.11 7,598.95 3.17 7,599.48 11.47 7,598.96 3.28 7,599.49 11.67 7,598.97 3.40 7,599,50 11.88 7,598.98 3.52 7,599.51 12.08 7,598.99 3.64 7,599.52 12.28 7,599.00 3.76 7,599.53 12.49 7,599.01 3.88 7,599.54 12.70 7,599.02 4.00 7,599.55 12.91 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type II 24 -hr 100 Year Rainfa11=2.70" Prepared by Gamba & Associates, Inc. Page 15 HydroCAD® 8.00 sin 004370 Q 2006 HydroCAD Software Solutions LLC 3/6/2007 Stage -Area -Storage for Pond 61P: Pond -M (Reservoir hidden lake) Elevation Surface Storage 1(feet) (acres) (acre-feet) 7,598.50 1.954 0.000 7,598.52 1.957 0.039 I 7,598.54 1.960 0.078 7,598.56 1.963 0.118 7,598.58 1.967 0.157 7,598.60 1.970 0.196 ' 7,598.62 1.973 0.236 7,598.64 1.976 0.275 7,598.66 1.979 0.315 7,598.68 1.982 0.354 1 7,598.70 1.986 0.394 7,598.72 1.989 0.434 7,598.74 1.992 0.474 I 7,598.76 1.995 0.513 7,598.78 1.998 0.553 7,598.80 2.001 0.593 7,598.82 2.005 0.633 I 7,598.84 2.008 0.673 7,598.86 2.011 0.714 7,598.88 2.014 0.754 7,598.90 2.017 0.794 I 7,598.92 2.020 0.835 7,598.94 2.024 0.875 7,598.96 2.027 0.916 7,598.98 2.030 0.956 11 7,599.00 2.033 0.997 7,599.02 2.036 1.037 7,599.04 2.039 1.078 I 7,599.06 2.042 1.119 7,599.08 2.046 1.160 7,599.10 2.049 1.201 7,599.12 2.052 1.242 ' 7,599.14 2.055 1.283 7,599.16 2.058 1.324 7,599.18 2.061 1.365 7,599.20 2.065 1.407 I 7,599.22 2.068 1.448 7,599.24 2.071 1.489 7,599.26 2.074 1.531 I 7,599.28 2.077 1.572 7,599.30 2.080 1.614 7,599.32 2.084 1.655 7,599.34 2.087 1.697 U 7,599.36 2.090 1.739 7,599.38 2.093 1.781 7,599.40 2.096 1.823 7,599.42 2.099 1.865 I 7,599.44 2.103 1.907 7,599.46 2.106 1.949 7,599.48 2.109 1.991 7,599.50 2.112 2.033 I7,599.52 2.115 2.075 7,599.54 2.118 2.118 Elevation Surface Storage (feet) (acres) (acre-feet) 7,599.56 2.121 2.160 7,599.58 2.125 2.202 7,599,60 2.128 2.245 7,599.62 2.131 2.288 7,599.64 2.134 2.330 7,599.66 2.137 2.373 7,599.68 2.140 2.416 7,599.70 2.144 2.459 7,599.72 2.147 2.501 7,599.74 2.150 2.544 7,599.76 2.153 2.587 7,599.78 2.156 2.631 7,599.80 2.159 2.674 7,599.82 2.163 2.717 7,599.84 2.166 2.760 7,599.86 2.169 2.804 7,599.88 2.172 2.847 7,599.90 2.175 2.890 7,599.92 2.178 2.934 7,599.94 2.182 2.978 7,599.96 2.185 3.021 7,599.98 2.188 3.065 7,600.00 2.191 3.109 — Inflaw II — Primary Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 16 HydroCAD® 8.00 s/n 004370 0 2006 HydroCAD Software Solutions LLC _ 3/6/2007 Link 62L: M -Outfall Inflow Area = 231.696 ac, Inflow Depth > 0.59" for 100 Year event Inflow = 36.44 cfs @ 12.47 hrs, Volume= 11.325 af Primary = 36.44 cfs @ 12.47 hrs, Volume= 11.325 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.0024.00 hrs, dt= 0.05 hrs Link 62L: M -Outfall Hydrograph 4o= 387, 36 34 32 36- 28 26- 24' Vs - 0 3 22 3 20.4 ii 18 16- 14� 12- 10-3 8' 6- 4 2. Inflow Area=231.696 ac 9 10 11 12 13 14 15 Time (hours) 16 7 18 19 20 2 22 23 24 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Gamba by ��Associates, Inc. HydroCAD® 0O sin 004370 © 2006HydroCAD Software Solutions LLC Hydrograph for Link 62L: M -Outfall Type I/ 24 -hr 100 Year Rainfall=2.70" Page 17 3/6/2007 Time 0.00 0.25 0.50 0.76 1.00 1.25 1.50 1.75 m� 2.00 2.25 2.50 2.75 3.00 325 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 N� 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 N� 9.25 9.50 9.75 10.00 �~ 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 N� 12.75 13.00 Inflow Elevation (cfs) (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 3.89 28.51 36.30 34.46 31.31 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary Time (cfs) (hours) 0.00 13.25 0.00 13.50 0.00 13.75 0.00 14.00 0.00 14.25 0.00 14.50 0.00 14.75 0.00 15.00 0.00 15.25 0.00 15.50 0.00 15.75 0.00 16.00 0.00 16.25 0.00 16.50 0.00 16.75 0.00 17.00 0.00 17.25 0.00 17.50 0.00 17.75 0.00 18.00 0.00 18.25 0.00 18.50 0.00 18.75 0.00 | 19.00 0l0 ' 19.25 0.00 19.50 0.00 19.75 0.00 20.00 0.00 20.25 0.00 20.50 0.00 20.75 0.00 21.00 0.00 21.25 0.00 21.50 0.00 21.75 0.00 22.00 0.00 22.25 0.00 22.50 0.00 22.75 0.00 23.00 0.00 23.25 0.00 23.50 0.00 23.75 0.00 24.00 0.00 0.00 0.00 0.01 3.89 28.51 36.30 34.46 31.31 Inflow Elevation (cfs) (feet) 28.17 0.00 25.31 0.00 22.77 20.58 18.66 17.03 15.70 14.59 13.63 12.77 12.00 11-28 10.62 10.03 9.54 9.11 8.73 8.38 8.06 7.77 7.50 7.24 6.99 6.76 6.53 6.31 6.09 5.88 5.67 5.49 5.34 5.20 5.09 4.98 4.88 4.79 4.71 4.64 4.56 4.50 4.44 4.38 4.32 4.27 0.00 00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 28.17 25.31 22.77 20.58 18.66 17.03 15.70 14.59 13.63 12.77 12.00 11.28 10.62 10.03 8.54 9.11 8.73 8.38 8.06 7.77 7.50 7.24 6.99 6.76 6.53 6.31 6.09 5.88 5.87 5.49 5.34 5.20 5.09 4.98 4.88 4.79 4.71 4.64 4.56 4.50 4.44 4.38 4.32 4.27 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 `Subcat SII Reach 14S Area N PRE Link Drainage Diagram for Pre -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Pre -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcats) 14.460 56 Brush, Fair, HSG B (14S) 79.560 70 Brush, Fair, HSG C (14S) 94.020 Page 2 3/612007 Pre -Development Type 1124 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 sin 004370 {O 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=5.00-24.00 hrs, dt=4.05 hrs, 381 points Runoff by SCS TR -20 method, ISH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-1nd method Subcatchment 14S: Area N Runoff Area=94.020 ac Runoff Depth>0.47" Flow Length=2,524' Tc=36.2 min CN=68 Runoff=25.10 cfs 3.690 af Total Runoff Area = 94.020 ac Runoff Volume = 3.690 af Average Runoff Depth = 0.47" 100.00% Pervious Area = 94.020 ac 0.O0% Impervious Area = 0.000 ac Pre -Development Prepared by Garnba & Associates, Inc. HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC Type II 24 -hr 100 YEAR Rainfall=2.70" Page 4 3/6/2007 Runoff Subcatchment 14S: Area N 25.10 cfs @ 12.39 hrs, Volume= 3.690 af, Depth> 0.47" Runoff by SCS TR -20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type 1124 -hr 100 YEAR Rainfall=2.70" Area (ac) CN Description 14.460 56 Brush, Fair, HSG B 79.560 70 Brush, Fair, HSG C 94.020 68 Weighted Average 94.020 Pervious Area Tc Length Slope Velocity Capacity Description min) {feet) {ftlft) {ftlsec) (cfs) 28.3 100 0.0309 0.06 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 3.9 610 0.0267 2.63 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 4.0 1,814 0.2239 7.62 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 36.2 2,524 Total 28 62422 26- 24 22 2a: 18= w 16= 14 - LL 12- 10 Subcatchment 14S: Area N Hydrograph J 25.10 cis I Type II 24 -hr 100 YEAR Rainfall=2.70" Runoff Area=94.020 ac Runoff Volume=3.690 af Runoff Depth>0.47" Flow Length=2,524' Tc=36.2 m i n CN=68 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 21 22 23 24 — Runoff 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Prepared by Gamba & Associates, Time Precip. Excess (hours) (inches) (inches) 5.00 0.17 0.00 5.25 0.18 0,00 5.50 0.19 0.00 5.75 0.20 0.00 6.00 0.22 0.00 6.25 0.23 0.00 6.50 0.24 0.00 6,75 0.25 0.00 7.00 0.27 0.00 7.25 0.28 0.00 7.50 0.29 0.00 7.75 0.31 0.00 8.00 0.32 8.00 8.25 0.34 0.00 8.50 0.36 0.00 8.75 0.38 0.80 9.00 0/40 0.00 9.25 0.42 0.00 9.50 0.44 0.00 9.75 0.48 0.00 10.88 0.49 0.00 10.25 0.53 0.00 10.50 0.55 0.00 10.75 0.59 0.00 11.00 0.03 0.00 11.25 0.69 0.00 11.50 0.76 0.00 11.75 1.04 0.00 12.00 1.79 0.13 12.25 1.91 0.10 12.50 1.98 0.19 12.75 2.04 0.21 13.00 2.08 0.22 13.25 2.12 0.24 13.50 2.16 0.25 13.75 2.19 0.28 14.00 2.21 0.27 14.25 2.24 0.28 14.50 2.26 0.29 14.75 2.28 0.30 15.00 2.30 0.31 15.25 2.32 0.31 15.50 2.34 0.32 15.75 2.36 0.33 16.00 2.38 0.34 16.25 2.39 0.34 18.50 2.41 0.35 16.75 2.42 0.35 17.00 2.43 0.38 17.25 2.45 0.37 17.50 2.46 0.37 17.75 2.47 0.38 18.00 2.49 0.38 Runoff (cfs) 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 O.O0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.63 20.77 23.34 15.01 10.21 7.64 6.22 5.32 4.65 4.16 3.80 3.56 3.40 3.24 3.10 2.94 2.79 2.63 2.50 2.41 2.35 2.29 2.24 2.18 2.13 Type 024-hrY00YEAR Rainf9ll=2.70" Page 5 3/6/2007 Inc. dmCADSuftware Solutions LLC Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.25 2.50 0.39 2.07 18.50 2.51 0.39 2.01 18.75 2.52 0.40 1.95 19.00 2.53 0.40 1.89 19.25 2.54 0.41 1.83 18.58 2,66 0.41 1.77 19.75 2.58 0.41 1.70 20.00 2.57 0/42 1.64 20.25 2.58 0.42 1.57 20.50 2.59 0.43 1.52 20.75 2.80 0.43 1.49 21D0 2.80 0.43 1.48 21.25 2.61 0.44 1.47 21.50 2.62 0/44 1.48 21.75 2.83 0.45 1.45 22.00 2.64 0.45 1.44 22.25 2.65 0.45 1.43 22.60 2.65 0.48 1.41 22.75 2.66 0.48 1.40 23.00 2.67 0.48 1,39 23.25 2.68 0.47 1.38 23.50 2.68 0.47 1.37 23.75 2.69 0.48 1.38 24.00 270 0.48 1.35 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Subcat <73S> Area-N-Byp.ss Porjd-N (2,S) Are N /7/7\5P Reach Link 76L N -Outfall Drainage Diagram for Post -Development Prepared by Garnba & Associates, Inc. 3/6/2007 HydroCAD® 8.00 sin 004370 C+ 2006 HydroCAD Software Solutions LLC 1 Post -Development Prepared by Gamba & Associates, Inc. Page 2 H droCAD® 8.00 sin 004370 U 2006 H droCAD Software Solutions LLC 316/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 14.564 56 Brush, Fair, HSG B (73S) 102.948 70 Brush, Fair, HSG C (21S,73S) 0.666 71 Meadow, non -grazed, HSG C (21S) 3.260 74 >75% Grass cover, Good, HSG C (21S) 5.630 98 Paved parking & roofs (21S) 127.068 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. HydroCADO 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR -20 method, UHY--SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 21 S: Area N Runoff Area=49.643 ac Runoff Depth>0.67" Plow Length=2,111' Type ll 24 -hr 100 Year Rainfall=2.70" Page 3 3/6/2007 Subcatchment 73S: Area -N -Bypass Pond 75P: Pond -N Link 76L: N -Outfall Flow Length=1,585" Tc=18.0 min CN=73 Runoff=35.44 cfs 2.791 af Runoff Area=77.425 ac Runoff Depth>0.44" Tc=26.3 min CN=67 Runoff=23.06 cfs 2.824 af Peak Eley=7,532.58' Storage1.423 af Inflow=35.44 cfs 2.791 af Outflow=2.26 cfs 1.746 af Inflow=23.79 cfs 4.570 af Primary=23.79 cfs 4.570 af Total Runoff Area = 127.068 ac Runoff Volume = 5.616 af Average Runoff Depth = 0.53" 95.57% Pervious Area = 121.438 ac 4.43% Impervious Area = 5.630 ac Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 4 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 21S: Area N Runoff = 35.44 cfs @ 12.12 hrs, Volume= 2.791 af, Depth> 0.67" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 40.087 70 Brush, Fair, HSG C 0.666 71 Meadow, non -grazed, HSG C 3.260 74 >75% Grass cover, Good, HSG C 5.630 98 Paved parking & roofs 49.643 73 Weighted Average 44.013 Pervious Area 5.630 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.7 100 0.0494 0.16 Sheet Flow, Grass: Short n= 0.150 P2= 1.30" 5.3 1,197 0.0540 3.74 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 2.0 814 0.0221 6.81 54.46 Channel Flow, Area= 8.0 sf Perirn= 9.0' r= 0.89' n= 0.030 Earth • rassed & windin• 18.0 2,111 Total 38_. 36: 34-- 32 4=32 30= 28= 261 24 41 22= 2- Subcatchment 215: Area N Hydrograph 35.44 cfs Type 1124 -hr 100 Year Rainfall -2.70" Runoff Area=49.643 ac Runoff Volume=2.791 af Runoff Depth>0.67" Flow Length=2,111' Tc=18.0 min CN=73 0 1 2 3 4 5 .. r^'"" , .... 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, inc. HydroCADU 8.00 sin 004370 4 2006 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 215: Area N Type 11 24 -hr 100 Year Rainfall=2.7O" Page 5 3/6/2007 Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.25 0.01 0.00 0.50 0.01 0.00 0.75 0.02 0.00 1.00 0.03 0.00 1.25 0.04 0.00 1.50 0.04 0.00 1.75 0.05 0.00 2.00 0.06 0.00 2.25 0.07 0.00 2.50 0.08 0.00 2.75 0.08 0.00 3.00 0.09 0.00 3.25 0.10 0.00 3.50 0.11 0.00 3.75 0.12 0.00 4.00 0.13 0.00 4.25 0.14 0.00 4.50 0.15 0.00 4.75 0.16 0.00 5.00 0.17 0.00 5.25 0.18 0.00 5.50 0.19 0.00 5.75 0.20 0.00 6.00 0.22 0.00 6.25 0.23 0.00 6.50 0.24 0.00 6.75 0.25 0.00 7.00 0.27 0.00 7.25 0.28 0.00 7.50 0.29 0.00 7.75 0.31 0.00 8.00 0.32 0.00 8.25 0.34 0.00 8.50 0.36 0.00 8.75 0.38 0.00 9.00 0.40 0.00 9.25 0.42 0.00 9.50 0.44 0.00 9.75 0.46 0.00 10.00 0.49 0.00 10.25 0.52 0.00 10.50 0.55 0.00 10.75 0.59 0.00 11.00 0.63 0.00 11.25 0.69 0.00 11.50 0.76 0.00 11.75 1.04 0.02 12.00 1.79 0.23 12.25 1.91 0.28 12.50 1.98 0.31 12.75 2.04 0.34 13.00 2.08 0.36 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.93 20.85 24.89 10.28 6.11 4.67 Time Precip. Excess (hours) (inches) (inches) 13.25 2.12 0,38 13.50 2.16 0.39 13.75 2.19 0.41 14.00 2.21 0.42 14.25 2.24 0.43 14.50 2.26 0.44 14.75 2.28 0.45 15.00 2.30 0.47 15.25 2.32 0.48 15.50 2.34 0.48 15.75 2.36 0.49 16.00 2.38 0.50 16.25 2.39 0.51 16.50 2.41 0.52 16.75 2.42 0.53 17.00 2.43 0.53 17.25 2.45 0.54 17.50 2.46 0.55 17.75 2.47 0.55 18.00 2.49 0.56 18.25 2.50 0.57 18.50 2.51 0.57 18.75 2.52 0.58 19.00 2.53 0.58 19.25 2.54 0.59 19.50 2.55 0.60 19.75 2.56 0.60 20.00 2.57 0.61 20.25 2.58 0.61 20.50 2.59 0.62 20.75 2.60 0.62 21.00 2.60 0.63 21.25 2.61 0.63 21.50 2.62 0.63 21.75 2.63 0.64 22.00 2.64 0.64 22.25 2.65 0.65 22.50 2.65 0.65 22.75 2.66 0.66 23.00 2.67 0.66 23.25 2.68 0.67 23.50 2.68 0.67 23.75 2.69 0.67 24.00 2.70 0.68 Runoff (cfs) 3.95 3,48 3.10 2.78 2.51 2.37 2.27 2.17 2.06 1.96 1.85 1.74 1.64 1.59 1.55 1.51 1.47 1.43 1.39 1.36 1.31 1.27 1.23 1.19 1.15 1.11 1.06 1.02 0.98 0.97 0,96 0.95 0.94 0.94 0.93 0.92 0.91 0.91 0.90 0.89 0.88 0.88 0.87 0.86 Post -Development Type 11 24 -hr 100 Year Rainfall -2.70" Prepared by Gamba & Associates, Inc. Page 6 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/612007 Subcatchrnent 73S: Area -N -Bypass Runoff 23.06 cfs @ 12.26 hrs, Volume= 2.824 af, Depths 0.44" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type 11 24 -hr 100 Year Rainfall -2.70" Area (ac) CN Description 14.564 56 Brush, Fair, HSG B 62.861 70 Brush, Fair, HSG C 77.425 67 Weighted Average 77.425 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ft/sec) (cfs) 23.1 100 0.0516 0.07 Sheet Flow, - Woods: Light underbrush n= 0.400 P2= 1.30" 3.2 1,485 0.2724 7.83 Shallow Concentrated Flow, Grassed Waterway Kv : 15.0 fps 26.3 1,585 Total 0 0 LL Subcatchment 73S: Area -N -Bypass Hydrograph 25- 24 23- 22- 21` 20 19' 18= 17- 16= 15- 14- 13- 12 '1 3-12'1 11_ 10- 9= 3 7 6 5 3 123.06 cfs Type 1124 -hr 100 Year Rainfall=2.70" Runoff Area=77.425 ac Runoff Volume=2.824 af Runoff Depth>O.44" Flow Length=1,585' Tc=28.3 min CN=67 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -development Type II 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 7 ydroCAD® 8.00 sin 004370 O 2006 HydroCAD Software Solutions LLC 3/6/2007 Hydrograph for Subcatchment 73S: Area -N -Bypass Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.25 0.01 0.00 0.50 0.01 0.00 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 0.02 0.03 0.04 0.04 0.05 0.06 0.07 0.08 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.22 0.23 0.24 0.25 0.27 0.28 0.29 0.31 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.46 0.49 0.52 0.55 0.59 0.63 0.69 0.76 1.04 1.79 1.91 1.98 2.04 2.08 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.11 0.15 0.17 0.19 0.20 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.57 23.04 14.26 8.68 6.10 Time Precip. Excess Runoff (hours) (inches) (inches) cfs 13.25 2.12 0.21 4.91 13.50 2.16 0.23 4.20 13.75 2.19 0.24 3.73 14.00 2.21 0.25 14.25 2.24 0.25 14.50 2.26 0.26 14.75 2.28 0.27 15.00 2.30 0.28 15.25 2.32 0.29 15.50 2.34 0.29 15.75 2.36 0.30 16.00 2.38 0.31 16.25 2.39 0.31 16.50 2.41 0.32 16.75 2.42 0.32 17.00 2.43 0.33 17.25 2.45 0.34 17.50 2.46 0.34 17.75 2.47 0.35 18.00 2.49 0.35 18.25 2.50 0.36 18.50 2.51 0.36 18.75 2.52 0.37 19.00 2.53 0.37 19.25 2.54 0.37 19.50 2.55 0.38 19.75 2.56 0.38 20.00 2.57 0.39 20.25 2.58 0.39 20.50 2.59 0.39 20.75 2.60 0.40 21.00 2.60 0.40 21.25 2.61 0.40 21.50 2.62 0.41 21.75 2.63 0.41 22.00 2.64 0.42 22.25 2.65 0.42 22.50 2.65 0.42 22.75 2.66 0.43 23.00 2.67 0.43 23.25 2.68 0.43 23.50 2.68 0.44 23.75 2.69 0.44 24.00 2.70 0.44 3.35 3.02 2.81 2.68 2.57 2.46 2.35 2.23 2.11 1.98 1.90 1.85 1.81 1.77 1.73 1.68 1.64 1.59 1.55 1.50 1.45 1.41 1.36 1.31 1.26 1.21 1.18 1.16 1.16 1.15 1.14 1.13 1.12 1.12 1.11 1.10 1.09 1.08 1.07 1.07 1.06 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 O 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 8 3/6/2007 Pond 75P: Pond -N Inflow Area = 49.643 ac, Inflow Depth > 0.67" for 100 Year event Inflow = 35.44 cfs @ 12.12 hrs, Volume= 2.791 af Outflow - 2.26 cfs @ 14.77 hrs, Volume= 1.746 af, Atten= 94%, Lag= 158.8 min Primary = 2.26 cfs @ 14.77 hrs, Volume= 1.746 af Routing by Star -Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 7,532.58' @ 14.77 hrs Surf.Area= 2.478 ac Storage= 1.423 af Plug -Flow detention time= 305.9 min calculated for 1.742 af (62% of inflow) Center -of -Mass det. time= 177.4 min ( 1,059.3 - 881.9 ) Volume Invert Avail.Stora #1 7,532.00' e Stara e Descri.tion 2.467 af Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre-feet) (acre-feet) 7,532.00 2.402 0.000 0.000 7,533.00 2.532 2.467 2.467 Device Routing Invert Outlet Devices #1 Primary 7,532.00' 24,0" x 57.5' long Culvert CMP, square edge headwall, Ke= 0.500 Outlet Invert= 7,530.00' S= 0.0348 '1' Cc= 0.900 n= 0.012 #2 Primary 7,532.00' 45.0 deg x 1.00' rise Sharp -Crested Vee/Trap Weir C= 2.56 Primary OutFlow Max=2.26 cfs @ 14.77 hrs HW=7,532.58' (Free Discharge) - i=Culvert (Inlet Controls 1.98 cfs © 2.60 fps) 2=Sharp-Crested Veen -rap Weir (Weir Controls 0.28 cfs 1.96 fps) 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. HydreCADQ 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 9 3/6/2007 Pond 75P: Pond -N Hyd reg raph 38. 36 34 32 30 28= 26= 24 w 22= o 3 20 2 18� 16� 141 12? 10-. 6, 4. 21 0 35.44 Inflow Area=49.643 ac 1 Peak Elev=7,532.58' Storage=1.423 of 7,534 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pond 75P: Pond -N Stage -Discharge w 0 7,533 R m W 7,532 0 2 4 6 8 10 Discharge (cfs) 12 14 Inflow 11 L-- Primary — Primary Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 c 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 10 3/6/2007 Elevation (feet) Pond 75P: Pond -N Stage -Area -Storage Surface/Horizontal/Wetted Area (acres) 0 1 7,534 7,533- 7,532 0 1 Storage (acre-feet) — Surface _ — Storage 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Type Tv//����rY��y�8r F�������7O" Post -Development',- ' Prepared <�8Onb@�kAssociates, Inc. Page 11 HydroCAD® "~p" 8.00 sin 004370 ©2D00HydmCADSoftware Solutions LLC 3/8C2007 Hydrograph for Pond 75P: Pond -N Time Inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet) (cfs) 0.00 0.00 0.000 7'632.00 0.00 0.50 0.08 0.000 7.532.00 0.00 1.00 0.00 0.800 7.532.00 0.00 1.50 0.00 0.000 7.532.00 0.00 2.00 0.00 0.000 7.632.00 0.00 2.50 0.00 0D00 7.532.00 0.00 3.00 0.00 0.000 7.532.80 0.08 3.50 0.00 0.080 7.532.00 0.00 4.00 0.00 0.000 7.532.00 0.00 4.50 0.00 0.000 7.532.00 0.00 5.00 0.00 0.008 7.632.00 0.00 5.50 0.00 0.000 7.532.00 0.00 8D0 0.00 0.000 7.532.00 0.00 8.50 0.00 0.000 7.532.00 0.00 7.00 0.00 0.000 7.532.00 0.00 7.50 0.00 0.800 7.532.00 0.00 8.08 0.00 0.000 7.532.00 0.00 8.50 0.00 0.000 7.532.00 0.00 9.00 8.00 0.000 7^532.00 0.00 9.50 0.00 0.000 7.532.00 0.00 10.00 0.00 0.000 7.53280 0.00 10.50 0.00 0.000 7.532.00 0.00 11.00 0.00 0.000 7,532.00 0.00 11.50 0.00 0.000 7.532.00 0.00 12.00 20.85 0.150 7.532.08 0.03 12.50 10.20 1.084 7`532.45 1.33 13.00 4.67 1.288 7,532.53 1.80 13.50 3.48 1,371 7.532.56 2.10 14.00 2.78 1.410 7.532.58 2.22 14.50 2.37 '1.422 7.532.58 2.25 16.00 2.17 1.422 7'532.58 2.26 15.50 1.96 1.415 7,532.58 2,23 16.00 1.74 1.400 7,532.57 2.19 18.50 1.59 1.379 7,532.57 2.12 17.00 1.51 1.356 7.532.58 2.08 17.50 1.43 1.334 7,532.55 1.99 18.00 1.36 1.310 7,532.54 1.92 18.50 1.27 1.287 7.532.53 1.86 19.00 1.19 1.262 7,532.52 1.79 19.50 1.11 1.237 7,532.51 1.72 20.00 1.02 1.211 7,532.50 1.65 20.50 0.97 1.185 7.53249 1.58 21.00 0.95 1.161 7.532.48 1.52 21.50 0.94 1.138 7,532.47 1.46 22.00 0.92 1,117 7,532.46 1/1 22.50 0.91 1.008 7,532.45 1.36 23.00 0.89 1.080 7.532.44 1.32 23.50 0.88 1.063 7,532.44 1.28 24.00 0.88 1.046 7,532.43 1.24 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Type 1124 -hr 100 Year Rainfall=2.70" Page 12 3/6/2007 Stage -Discharge for Pond 75P: Pond -N Elevation Primary Elevation Primary Elevation Primary Elevation Primary (feet) (cfsl (feet) (cfs) (feet) (cfs) (feet) _ (cfs) 7,532.00 0.00 7,532.53 1.87 7,533.06 7.11 7,533.59 13.39 7,532.01 0.00 7,532.54 1.94 7,533.07 7.23 7,533.60 13.51 7,532.02 0.00 7,532.55 2.01 7,533.08 7.35 7,533.61 13.62 7,532.03 0.01 7,532.56 2.08 7,533.09 7.46 7,533.62 13.74 7,532.04 0,01 7,532.57 2.16 7,533.10 7.58 7,533.63 13.85 7,532.05 0.02 7,532.58 2.23 7,533.11 7.70 7,533.64 13.97 7,532.06 0.02 7,532.59 2.31 7,533.12 7.81 7,533.65 14.08 7,532.07 0.03 7,532.60 2.39 7,533.13 7.93 7,533.66 14.20 7,532.08 0.04 7,532.61 2.46 7,533.14 8.05 7,533.67 14.31 7,532.09 0.05 7,532.62 2.54 7,533.15 8.17 7,533.68 14.42 7,532.10 0.07 7,532.63 2.63 7,533.16 8.28 7,533.69 14.53 7,532.11 0.08 7,532.64 2.71 7,533.17 8.40 7,533.70 14.64 7,532.12 0.10 7,532.65 2.79 7,533.18 8.52 7,533.71 14.75 7,532.13 0.11 7,532.66 2.88 7,533.19 8.64 7,533.72 14.86 7,532.14 0.13 7,532.67 2.96 7,533.20 8.76 7,533.73 14.97 7,532.15 0.15 7,532.68 3.05 7,533.21 8.88 7,533.74 15.08 7,532.16 0.17 7,532.69 3.14 7,533.22 8.99 7,533.75 15.19 7,532.17 0.19 7,532.70 3.23 7,533.23 9.11 7,533.76 15.29 7,532.18 0.22 7,532.71 3.32 7,533.24 9.23 7,533,77 15.40 7,532.19 0.24 7,532.72 3.41 7,533.25 9.35 7,533.78 15.50 7,532.20 0.27 7,532.73 3.50 7,533.26 9.47 7,533.79 15.61 7,532.21 0.30 7,532.74 3.59 7,533.27 9.59 7,533.80 15.71 7,532.22 0.32 7,532.75 3.69 7,533.28 9.71 7,533.81 15.81 7,532.23 0.35 7,532.76 3.79 7,533.29 9.83 7,533.82 15.91 7,532.24 0.39 7,532.77 3.88 7,533.30 9.95 7,533.83 16.01 7,532.25 0.42 7,532.78 3.98 7,533.31 10.07 7,533.84 16.11 7,532.26 0.45 7,532.79 4.08 7,533.32 10.19 7,533.85 16.21 7,532.27 0.49 7,532.80 4.18 7,533.33 10.31 7,533.86 16.30 7,532.28 0.53 7,532.81 4.28 7,533.34 10.43 7,533.87 16.39 7,532.29 0.56 7,532.82 4.38 7,533.35 10.55 7,533.88 16.49 7,532.30 0.60 7,532.83 4.49 7,533.36 10.66 7,533.89 16.58 7,532.31 0.64 7,532.84 4.59 7,533.37 10.78 7,533.90 16.67 7,532.32 0.69 7,532.85 4.70 7,533.38 10.90 7,533.91 16.75 7,532.33 0.73 7,532.86 4.81 7,533.39 11.02 7,533.92 16.84 7,532.34 0.77 7,532.87 4.91 7,533.40 11.14 7,533.93 16.92 7,532.35 0.82 7,532.88 5.02 7,533.41 11.26 7,533.94 17.00 7,532.36 0.87 7,532.89 5.13 7,533.42 11.38 7,533.95 17.08 7,532.37 0.92 7,532.90 5.24 7,533.43 11.50 7,533.96 17.16 7,532.38 0.97 7,532.91 5.36 7,533.44 11,62 7,533.97 17.23 7,532.39 1.02 7,532.92 5.47 7,533.45 11.74 7,533.98 17.30 7,532.40 1.07 7,532.93 5.58 7,533.46 11.86 7,533.99 17.36 7,532.41 1.12 7,532.94 5.70 7,533.47 11.98 7,534.00 17.41 7,532.42 1.18 7,532.95 5.81 7,533.48 12.10 7,532.43 1.24 7,532.96 5.93 7,533.49 12.22 7,532.44 1.29 7,532.97 6.05 7,533.50 12.34 7,532.45 1.35 7,532.98 6.17 7,533.51 12.45 7,532.46 1.41 7,532.99 6.29 7,533.52 12.57 7,532.47 1.47 7,533.00 6.41 7,533.53 12.69 7,532.48 1.54 7,533.01 6.53 7,533.54 12.81 7,532.49 1.60 7,533.02 6.65 7,533.55 12.93 7,532.50 1.67 7,533.03 6.76 7,533.56 13.04 7,532.51 1.73 7,533.04 6.88 7,533.57 13.16 7,532.52 1.80 7,533.05 7.00 7,533.58 13.28 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfal1=2.70" Prepared by Gamba & Associates, Inc. Page 13 H droCAD® 8.00 sin 004370 © 2006 H droCAD Software Solutions LLC 3/6/2007 Stage -Area -Storage for Pond 75P: Pond -N Elevation Surface Storage Elevation Surface Storage (feet) (acres) (acre-feet) (feet) (acres) (acre-feet) 7,532.00 2.402 0.000 7,533.06 2.532 2.467 7,532.02 2.405 0.048 7,533.08 2.532 2.467 7,532_04 2.407 0.096 7,533.10 2.532 2.467 7,532.06 2.410 0.144 7,533.12 2.532 2.467 7,532.08 2.412 0.193 7,533.14 2.532 2.467 7,532.10 2.415 0.241 7,533.16 2.532 2.467 7,532.12 2.418 0.289 7,533.18 2.532 2.467 7,532.14 2.420 0.338 7,533.20 2.532 2.467 7,532.16 2.423 0.386 7,533.22 2.532 2.467 7,532.18 2.425 0.434 7,533.24 2.532 2.467 7,532.20 2.428 0.483 7,533.26 2.532 2.467 7,532.22 2.431 0.532 7,533.28 2.532 2.467 7,532.24 2.433 0.580 7,533.30 2.532 2.467 7,532.26 2.436 0.629 7,533.32 2,532 2.467 7,532.28 2.438 0.678 7,533.34 2.532 2.467 7,532.30 2.441 0.726 7,533.36 2.532 2.467 7,532.32 2.444 0.775 7,533.38 2.532 2.467 7,532.34 2.446 0.824 7,533.40 2.532 2.467 7,532.36 2.449 0.873 7,533.42 2.532 2.467 7,532.38 2.451 0.922 7,533.44 2.532 2.467 7,532.40 2.454 0.971 7,533.46 2.532 2.467 7,532.42 2.457 1.020 7,533.48 2.532 2.467 7,532.44 2.459 1.069 7,533.50 2.532 2.467 7,532.46 2.462 1.119 7,533.52 2.532 2.467 7,532.48 2.464 1.168 7,533.54 2.532 2.467 7,532.50 2.467 1.217 7,533.56 2.532 2.467 7,532.52 2.470 1.267 7,533.58 2.532 2.467 7,532.54 2.472 1.316 7,533.60 2.532 2.467 7,532.56 2.475 1.366 7,533.62 2.532 2.467 7,532.58 2.477 1.415 7,533.64 2.532 2.467 7,532.60 2.480 1.465 7,533.66 2.532 2.467 7,532.62 2.483 1.514 7,533.68 2.532 2.467 7,532.64 2.485 1.564 7,533.70 2.532 2.467 7,532.66 2.488 1.614 7,533.72 2.532 2.467 7,532.68 2.490 1.663 7,533.74 2.532 2.467 7,532.70 2.493 1.713 7,533.76 2.532 2.467 7,532.72 2.496 1.763 7,533.78 2.532 2.467 7,532.74 2.498 1.813 7,533.80 2.532 2.467 7,532.76 2.501 1.863 7,533.82 2.532 2.467 7,532.78 2.503 1.913 7,533.84 2.532 2.467 7,532.80 2.506 1.963 7,533.86 2 532 2.467 7,532.82 2.509 2.013 7,533.88 2.532 2.467 7,532.84 2.511 2.064 7,533.90 2.532 2.467 7,532.86 2.514 2.114 7,533.92 2.532 2.467 7,532.88 2.516 2.164 7,533.94 2.532 2.467 7,532.90 2.519 2.214 7,533.96 2.532 2.467 7,532.92 2.522 2.265 7,533.98 2.532 2.467 7,532.94 2.524 2.315 7,534.00 2.532 2.467 7,532.96 2.527 2.366 7,532.98 2.529 2.416 7,533.00 2.532 2.467 7,533.02 2.532 2.467 7,533.04 2.532 2.467 Post -Development Type 11 24 -hr 100 Year Rainfall=2.717" Prepared by Gamba & Associates, Inc. Page 14 HydroCAD® 8.00 sin 004370 O 2006 HydroCAD Software Solutions LLC 3/6/2007 Link 76L: N -Outfall Inflow Area = 127.068 ac, Inflow Depth > 0.43" for 100 Year event Inflow = 23.79 cfs @ 12.26 hrs, Volume= 4.570 of Primary = 23.79 cfs @ 12.26 hrs, Volume= 4.570 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 76L: N -Outfall Hydrograph 26- 25 24-1 23 22-1 21 20- 19- 18= 019-18- 17- 16 1n15 u 14- 13- 0 12= ri 11 10 9= 7 5 2-, 0' 23.79 cfs Inflow Area=127,068 ac 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 18 17 18 19 20 21 22 23 24 Time (hours) Inflow — Primary! 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Gamba by ��Associates, Inc. Prepared 00 �n 004370 ��2UO8 HydroCAD Software Solutions LLC HydnoCA��8�, Hydrograph for Link 76L: N -Outfall Type 11 24 -hr 100 Year Rainfall=2.70" Page 15 3/6/2007 Time N� (hours) 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 N� 4,50 m� 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 N� 7.25 m� 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 N� 10.00 10.25 10.50 10.75 11.00 11.25 11.50 111.75 12.DO 12.25 12.50 12.75 13.00 Inflow Elevation (cfs) (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.60 23.73 15.59 10.34 7.96 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary Time (cfs) (hours) 0.00 13.25 0.00 13.50 0.00 13.75 O_0O 14.00 0.00 14.25 0.00 14,50 0.00 14.75 0.00 15.00 0.00 15.25 0.00 15.50 0,00 15.75 0.00 16.00 0.00 16.25 0.00 16.50 0.00 16.75 0.00 17.00 0]J0 17.25 0.00 17.50 0.00 17.75 0.00 18.00 0.00 18.25 0.00 18.50 0.00 18.75 0.00 19.00 0.00 19.25 0.00 19.50 0.00 19.75 0.00 20.00 0.00 20.25 0.00 20.50 0.00 20.75 0.00 21.00 0.00 21.25 0.00 21.50 0.00 21.75 0.00 22.00 0.00 22.25 0.00 22.50 0.00 22.75 0.00 23.00 0.00 23.25 0.00 23.50 0.00 23.75 0.00 24.00 0.00 0.00 0.00 0.00 4.60 23.73 15.59 10.34 7.96 Inflow Elevation (cfs) (feet) 6.91 0.00 6.30 0.00 5.90 5.57 5.27 5.06 4.94 4.82 4.71 4.58 444 4.29 4.14 4.03 3.94 3.87 3.79 3.72 3.64 3.56 3.48 3.41 3.32 3.24 3.16 3.08 2.99 2.91 2.82 2.76 2.71 2.67 2.64 2.60 2.57 2.53 2.50 2.47 2.44 2.41 2.38 2.35 2.32 2.30 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 6.91 6.30 5.90 5.57 5.27 5.06 4.94 4.82 4.71 4.58 4.44 4.29 4.14 4.03 3.04 3.87 3.79 3.72 3.64 3.56 3.48 3.41 3.32 324 3.16 3.08 2.99 2,81 2.82 2.76 2.71 2.67 2.64 2.60 2.57 2.53 2.50 2.47 2.44 2.41 2.38 2.35 2.32 2.30 (Sub ) Reach K15S) Area 0 PRE Link Drainage Diagram for Pre -Development Prepared by Gamba & Associates, Inc. 316/2007 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 1 Pre -Development Prepared by Gamba & Associates, Inc. Page 2 H droCAD® 8.00 sln 004370 © 2006 H droCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) 1 Area (acres) CN Description (subcats) 23.960 56 Brush, Fair, HSG B (15S) 84.170 70 Brush, Fair, HSG C (15S) 108.130 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Type 11 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 stn 004370 0 2006 HydroCAD Software Solutions LLC 3/612007 Time span=5.00-24.00 hrs, dt=0.06 hrs, 381 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 15S: Area 0 Runoff Area=108.130 ac Runoff Depth>0.43" Flow Length=4,610' Tc=45,1 min CN=67 Runoff=21.90 cfs 3.909 af Total Runoff Area = 108.130 ac Runoff Volume = 3.909 af Average Runoff Depth = 0.43" 100.00% Pervious Area = 108.130 ac 0.00% Impervious Area = 0.000 ac Pre -Development Type 11 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 4 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 15S: Area 0 Runoff = 21.90 cfs @ 12.53 hrs, Volume= 3.909 af, Depth> 0.43" Runoff by SCS TR -20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 YEAR Rainfall=2.70" Area (ac) CN Description 23.960 56 Brush, Fair, HSG B 84.170 70 Brush, Fair, HSG C 108.130 67 Weighted Average 108.130 Pervious Area Tc Length Slope Velocity Capacity Description Amin} (feet] (ftfft} (ftfsec) {cfs} 31.8 100 0.0231 0.05 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 13.3 4,510 0.1231 5.65 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 45,1 4,610 Total Subcatchment 15S: Area 0 Hydrograph 24 23= 22- 21 20 19- 18= 17= 16 15� � 14 13- 12 1„- 1a-: 6- 5= 3-- 2 10 11 21.90cfs1 Type II 24 -hr 100 YEAR Rainfall=2.70” Runoff Area=108.130 ac Runoff Volume=3.909 of Runoff Depth>0.43" Flow Length=4,610' Tc=45.1 min CN=67 12 13 14 15 16 17 Time (hours) 18 19 20 21 22 23 24 Runoff 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Prepared by Gamba & Associates„ Inc. HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Hydrograph for Subcatehment 15S: Area 0 Type 1124 -hr 100 YEAR Rainfall=2.70" Page 5 3/6/2007 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.17 0.00 0.00 5.25 0.18 0.00 0.00 5.50 0.19 0.00 0.00 5.75 0.20 0.00 0.00 6.00 0.22 0.00 0.00 6.25 0.23 0.00 0.00 6.50 0.24 0.00 0.00 6.75 0.25 0.00 0.00 7.00 0.27 0.00 0.00 7.25 0.28 0.00 0.00 7.50 0.29 0.00 0.00 7.75 0.31 0.00 0.00 8.00 0.32 0.00 0.00 8.25 0.34 0.00 0.00 8.50 0.36 0.00 0.00 8.75 0.38 0.00 0.00 9.00 0.40 0.00 0,00 9.25 0.42 0.00 0.00 9.50 0.44 0.00 0.00 9.75 0.46 0.00 0.00 10.00 0.49 0.00 0.00 10.25 0.52 0.00 0.00 10.50 0.55 0.00 0.00 10.75 0.59 0.00 0.00 11.00 0.63 0.00 0.00 11.25 0.69 0.00 0.00 11.50 0.76 0.00 0.00 11.75 1.04 0.00 0.00 12.00 1.79 0.11 1.17 12.25 1.91 0.15 12.50 12.50 1.98 0.17 21.80 12.75 2.04 0.19 18.38 13.00 2.08 0.20 13.01 13.25 2.12 0.21 9.70 13.50 2.16 0.23 7.70 13.75 2.19 0.24 6.43 14.00 2.21 0.25 5.56 14.25 2.24 0.25 4.90 14.50 2.26 0.26 4.38 14.75 2.28 0.27 4.04 15,00 2.30 0.28 3.81 15.25 2.32 0.29 3.63 15.50 2.34 0.29 3.47 15.75 2.36 0.30 3.30 16.00 2.38 0.31 3.14 16.25 2.39 0.31 2.97 16.50 2.41 0.32 2.81 16.75 2.42 0.32 2.69 17.00 2.43 0.33 2.61 17.25 2.45 0.34 2.54 17.50 2.46 0.34 2.48 17.75 2.47 0.35 2.42 18.00 2.49 0.35 2.36 Time Precip. Excess (hours) (inches) (inches) 18.25 2.50 0.36 18.50 2.51 0.36 18.75 2.52 0.37 19.00 2.53 0.37 19.25 2.54 0.37 19.50 2.55 0.38 19.75 2.56 0.38 20.00 2.57 0.39 20.25 2.58 0.39 20.50 2.59 0.39 20.75 2.60 0.40 21.00 2.60 0.40 21.25 2.61 0.40 21.50 2.62 0.41 21.75 2.63 0.41 22.00 2.64 0.42 22.25 2.65 0.42 22.50 2,65 0.42 22.75 2.66 0.43 23.00 2.67 0.43 23.25 2.68 0.43 23.50 2.68 0.44 23.75 2.69 0.44 24.00 2.70 0.44 Runoff (cfs) 2.30 2.24 2.17 2.11 2.04 1.97 1.90 1.84 1.76 1.70 1.66 1.64 1.62 1.61 1.59 1.58 1.57 1.56 1.55 1.54 1.53 1.52 1.50 1.49 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Subcat Reach <43S> Art 0 <45S> 44P 0 -Bypass Link Pod -O 46L O -Outfall Drainage Diagram for Post -Development Prepared by Garnba & Associates, Inc. 3/6/2007 HydroCADO 8.00 sin 004370 0 2006 HydroCAD Software Solutions LLC Post -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 24.755 56 Brush, Fair, HSG B (43S,455) 79.226 70 Brush, Fair, HSG C (43S,45S) 9.225 74 >75% Grass cover, Good, HSG C (43S,45S) 10.505 98 Paved parking & roofs (43S,453) 123.711 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=103.345 ac Runoff Depth>0.58" Tc=43.8 min CN=71 Runoff=33.19 cfs 5.028 af Type 11 24 -hr 100 Year Rainfall=2.70" Page 3 3/6/2007 Subcatchment 43S: Area 0 Subcatchment 45S: 0 -Bypass Pond 44P: Pond -0 Link 46L: 0 -Outfall Flow Length=3,886' Runoff Area=20.366 ac Runoff Flow Length=1,537' Tc=17.9 min CN=65 Runoff=6.05 Peak Elev=7,160,84' Storage=1.003 af Inflow=33.19 Outflow= 18.68 Depth>0.37" cfs 0,633 of cfs 5.028 af cfs 4.862 af Inflow=19.94 cfs 5.495 af Primary=19.94 cfs 5.495 af Total Runoff Area = 123.711 ac Runoff Volume = 5.660 af Average Runoff Depth = 0.55" 91.51% Pervious Area = 113.206 ac 8.49% Impervious Area = 10.505 ac Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Type 1124 -hr 100 Year Rainfall=2.70" Page 4 3/6/2007 Subcatchment 43S: Area 0 Runoff - 33.19 cfs @ 12.49 hrs, Volume= 5.028 af, Depths 0.58" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type I124 -hr 100 Year Rainfall =2.70" Area (ac) CN Description 15.070 56 Brush, Fair, HSG B 69.720 70 Brush, Fair, HSG C 9.110 74 >75% Grass cover, Good, HSG C 9.445 98 _Paved parking & roofs 103.345 71 Weighted Average 93.900 Pervious Area 9.445 Impervious Area Tc Length Slope Velocity Capacity Description (min feet} (ftift} (ftisec) (cfs) 31.9 100 0.0230 0.05 11.9 3,786 0.1091 5.32 43.8 3,886 Total 36- 34 32 30 287' 26 24- 22- rs 20- 3 18 0 u 16H 14= 12- 0 8 6 4 2 - Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" Shallow Concentrated Flow, Unpaved Kv= 16.1 fps Subcatchment 43S: Area 0 Hydrograph 1 33.19 cfsl Type II 24 -hr 100 Year Rainfall=2.70" Runoff Area=103.345 ac Runoff Volume=5.028 af Runoff Depth>0.58" Flow Length=3,886' Tc=43.8 m i n CN=71 07 T 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1117 18 19 20 21 22 23 24 Time (hours) — Runo 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -development Prepared by Gamba & Associates, Inc. I droCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfa11=2.74" Page 5 3/6/2007 Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.25 0.01 0.00 0,50 0.01 0.00 0.75 0.02 0.00 1.00 0.03 0.00 1.25 0.04 0.00 1.50 0.04 0.00 1.75 0.05 0.00 2.00 0.06 0.00 2.25 0.07 0.00 2.50 0.08 0.00 2.75 0.08 0.00 3,00 0.09 0.00 3.25 0.10 0.00 3.50 0.11 0.00 3.75 0.12 0.00 4.00 0.13 0.00 4.25 0.14 0.00 4.50 0.15 0.00 4.75 0.16 0.00 5.00 0.17 0.00 5.25 0.18 0.00 5.50 0.19 0.00 5.75 0.20 0.00 6.00 0.22 0.00 6.25 0.23 0.00 6.50 0.24 0.00 6.75 0.25 0.00 7.00 0.27 0.00 7.25 0.28 0.00 7.50 0.29 0.00 7.75 0.31 0.00 8.00 0.32 0.00 8.25 0.34 0.00 8.50 0.36 0.00 8.75 0.38 0.00 9.00 0.40 0.00 9.25 0.42 0.00 9.50 0.44 0.00 9.75 0.46 0.00 10.00 0.49 0.00 10.25 0.52 0.00 10.50 0.55 0.00 10.75 0.59 0.00 11.00 0.63 0.00 11.25 0.69 0.00 11.50 0.76 0.00 11.75 1.04 0.01 12.00 1.79 0.19 12.25 1.91 0.23 12.50 1.98 0.26 12.75 2.04 0.28 13.00 2.08 0.30 Hydrograph for Subcatehment 43S: Area 0 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 3.10 22.33 33.15 24.92 16.79 Time Precip. Excess (hours) (inches) (inches) 13.25 2.12 0.32 13,50 2.16 0.33 13.75 2.19 0.34 14.00 2.21 0.36 14.25 2.24 0.37 14,50 2.26 0.38 14.75 2.28 0.39 15.00 2,30 0.40 15.25 2.32 0.41 15.50 2.34 0.41 15.75 2.36 0.42 16.00 2.38 0.43 16.25 2.39 0.44 16.50 2.41 0.45 16.75 2.42 0.45 17.00 2.43 0.46 17.25 2.45 0.47 17.50 2.46 0.47 17.75 2.47 0.48 18.00 2.49 0.48 18.25 2.50 0.49 18.50 2.51 0.50 18.75 2.52 0.50 19.00 2.53 0.51 19.25 2.54 0.51 19.50 2.55 0.52 19.75 2.56 0.52 20.00 2.57 0.53 20.25 2.58 0.53 20.50 2.59 0.54 20.75 2.60 0.54 21.00 2.60 0.54 21.25 2.61 0.55 21.50 2.62 0.55 21.75 2.63 0.56 22.00 2.64 0.56 22.25 2.65 0.57 22.50 2.65 0.57 22.75 2.66 0.57 23.00 2.67 0.58 23.25 2.68 0.58 23.50 2.68 0.59 23.75 2.69 0.59 24.00 2.70 0.59 Runoff (cfs) 12.08 9.37 7.72 6.61 5.77 5.14 4.75 4.47 4.25 4.05 3.85 3.65 3.44 3.26 3.12 3.02 2.94 2.86 2.79 2.71 2.64 2.56 2.49 2.41 2.33 2.25 2.17 2.09 2.01 1.94 1.89 1.86 1.84 1.83 1.81 1.80 1.79 1.77 1.76 1.74 1.73 1.72 1.70 1.69 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70., Page 6 3/6/2007 Subcatchment 455: 0 -Bypass Runoff = 6.05 cfs @ 12.15 hrs, Volume= 0.633 af, Depth> 0.37" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type 11 24 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 9.685 56 Brush, Fair, HSG B 9.506 70 Brush, Fair, HSG C 0.115 74 >75% Grass cover, Good, HSG C 1.060 98 Paved parking & roofs 20.366 65 Weighted Average 19.306 Pervious Area 1.060 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.7 100 0.0568 0.11 Sheet Flow, Grass: Dense n= 0.240 P2= 1.30" 3.2 1,437 0.2162 7.49 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 17.9 1,537 Total Subcatchment 455: ©-Bypass Hydrograph [ 8.05 cfs 1 Type 1124 -hr 100 Year Rainfall=2.70" Runoff Area=20.366 ac Runoff Volume=0.633 af Runoff Depth>0.37" Flow length=1,537' Tc=17.9 min CN=65 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Type ��4-hr��� Year �������� 7D" Post -Development'' Page Prepared Gamba�k�SgO�i@t�� Inc.'~r~ roCAD Software Solutions LLC 3/8/2007 Hydrograph for Subcatchmenk45S:0-Bypass Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.08 0.25 0.01 0.00 0.50 8.01 0.00 0.75 0.02 0.00 1.00 0.03 0.00 1.25 0.04 0.08 1.50 0.04 0.00 175 0.05 0.00 2.00 0J36 0.00 2.25 0.07 0.00 2.50 0.08 0.00 2.75 0.08 0.00 3.00 0.00 0.08 3.25 0.10 0.00 3.60 0.11 0.00 3.75 0.12 0.00 4.00 0.13 0.00 4.25 0.14 0.00 4.60 0.15 0.00 4.75 0.16 8.00 5.00 0j7 0.00 5.25 0.18 0.00 5.50 0.19 0.00 5.75 0,30 0.00 6.00 0.22 0.00 8.25 0.23 0.00 6.50 0.24 0.00 6.75 0.25 0.00 7.00 0.27 8.00 7.25 0.28 0.00 7.50 0.29 8D0 7.75 0.31 0.00 8.00 0.32 0.00 8.25 0.34 0.00 8.50 0.36 0.08 8.75 0.38 0.00 9.00 0.40 0.00 9.25 0.42 0.00 9.50 0.44 0.00 9.75 0.46 0.00 10.00 0.49 0.00 10.25 0.52 0.00 10.50 0.55 0.00 10.75 0.59 0.00 11.00 0.63 0.00 11.25 0.69 0.00 11.50 0.76 8.00 11.75 1.04 0.00 12O0 1.79 0.08 12.25 1.91 0.11 12.50 1.98 0.13 12.75 2.04 0.15 13.00 2.08 0.16 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.22 4.78 2.32 1.49 1.18 Time Precip. Excess (hours) (inches) (inches) 13.25 2.12 0.17 13.50 2.16 0.18 13.75 2.19 0.19 14J00 2.21 0.20 14.25 2.24 0.21 14.50 2.26 0.21 14.75 2.28 0.22 15.00 2.30 0.23 15.35 2.32 0.23 15.50 2.34 0.24 15.75 2.36 0.25 16.00 2.38 0.25 16.25 2.39 0.28 16.50 2.41 0.38 16.75 2.42 0.27 17.00 2.43 0.27 17.25 2.45 028 17.50 2.46 0.28 17.75 2.47 0.29 18.00 2.49 0.29 18.25 2.50 0.30 18.50 2.51 0.30 18.75 2.52 0.31 19.00 2.53 0.31 19.25 2.54 0.31 19.50 2.55 0.32 19.75 2.56 0.32 20.00 2.57 0.32 2025 2.58 0.33 20.50 2.59 0.33 30J5 2.80 0.33 21.00 2.80 0.34 21.25 2.61 0.34 21.50 2.62 0.34 21.75 2.63 0.35 22D0 2.64 0.35 22.25 2.65 0.35 22.50 2.65 0.36 22.75 2.06 0.36 33.00 2.67 0.30 23.25 2.68 0.37 23.50 2.88 0.37 23.75 2.69 0.37 24.00 2.70 0.38 Runoff (cfs) 1.01 0.91 0.81 0.74 0.67 0.64 0.61 0.59 0.56 0.54 0.51 0.48 0.45 0.44 0.43 0.42 0.41 0.40 0.39 0.38 0.37 0.36 0.35 0.34 0.33 0.32 0.30 0.29 0.28 0.28 0.28 0.27 0.27 0.27 0.27 0.27 0.27 0.26 0.26 0.26 0.26 0.26 0.25 0.25 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 8 HydroCADO 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Pond 44P: Pond -0 Inflow Area = 103.345 ac, Inflow Depth > 0.58" for 100 Year event Inflow = 33.19 cfs @ 12.49 hrs, Volume= 5.028 af Outflow = 18.68 cfs @ 12.93 hrs, Volume= 4.862 af, Atten= 44%, Lag= 26.5 min Primary = 18.68 cfs @ 12.93 hrs, Volume= 4.862 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 7,160.84' @ 12.93 hrs Surf.Area= 0.550 ac Storage= 1.003 af Plug -Flow detention time= 44.9 min calculated for 4.862 af (97% of inflow) Center -of -Mass det. time= 28.0 min ( 935.9 - 908.0 ) Volume Invert Avail.Stora•e Stora•e Descri'tion #1 7,158.00' Elevation Surf.Area (feet) (acres) 7,158.00 0.000 7,159.00 0.310 7,160.00 0.504 7,161.00 0.559 7,162.00 0.615 1.681 af Custom Stage Data (Prismatic)Listed below (Recalc) Inc.Store Cum.Store (acre-feet) (acre-feet) 0.000 0.000 0.155 0.155 0.407 0.562 0.532 1.093 0.587 1.681 Device Routing Invert Outlet Devices #1 Primary 7,158.00' 30.0" x 49.0' long Culvert CMP, square edge headwall, Ke= 0.500 Outlet Invert= 7,152.91' 5= 0.1039 'P Cc= 0.900 n= 0.012 Concrete pipe, finished #2 Device 1 7,158.50' 25.0" Vert. Orifice/Grate C= 0,600 Primary OutFlow Max=18.67 cfs @ 12.93 hrs HW=7,160.84' (Free Discharge) =Culvert (Passes 18.67 cfs of 29.77 cfs potential flow) 2=Orifice/Grate (Orifice Controls 18.67 cfs @ 5.48 fps) 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 9 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 36 34 32 30 28.. 26- 24 22-: u • 20- 3 18- 0 L. 16. Elevation (feet) 14 12-: 10, 8= 6 2 0 Pond 44P: Pond -O Hydrograph 1 33.19 cls Inflow Area=103.345 ac Peak EIev=7,160.64' Storage=1.003 of 7,162 7,161- 7,1 7,159- 7,158 10 11 12 13 14 15 1' Time (hours) Pond 44P: Pond -0 Stage -discharge 17 18 19 20 21 22 23 24 0 6 10 12 14 16 18 20 22 24 Discharge (cfs) — Inflow — Primary — Primary Post -Development Prepared by Gamba & Associates, Inc. H droCAD® 8.00 sin 004370 © 2006 H droCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 10 3/6/2007 Pond 44P: Pond-© Stage -Area -Storage Surface(I4orizontadfWetted Area (acres) 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 7.162 0.45 0.5 0.55 0.6 0 Storage (acre-feet) -- Surface Storage 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Type II 100 Year F�8inf8�=270" Post -Development^' Prepared by Gamba & Associates, Inc. Page 11 HydroCADO8.0O sin 004370 0 2006 HydroCAD Software Solutions LLC 3/6/2007 Hydrograph for Pond 44P: Pond -0 Time Inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet) (cfs) 0.00 0.00 0.000 7.158.00 0.00 0.50 0.00 0.000 7.158.00 0.00 1.00 0.08 0.000 7.158.08 0.00 1.50 0.00 0.000 7`158.00 0.00 3.00 0.00 0.000 7^158.00 0.80 2.50 0.00 8.000 7.158.00 0.00 3.00 0.80 0.000 7.158.00 0.00 3.50 0.00 0.000 7.158.00 0.00 4.00 0.00 0.000 7.168.00 0.00 4.50 0.08 0.000 7.158.00 0.00 8.00 0.00 0.000 7.158.00 0.00 5.60 0.00 0.000 7.158.00 0.80 6.00 0.00 0.000 7.158.00 0.00 8.50 0.00 0.000 7.158.00 0.00 7.00 0.00 0.000 7.158.00 0.00 7.50 0.00 0.000 7.158.00 0.00 8.00 0.00 0.000 7^158.00 0.00 8.50 0.00 0.080 7.158.30 0.00 9.00 0.00 0.000 7.158.00 0.00 8.50 0.00 0.000 7.158.00 0.00 10.00 0.00 0.000 7,158.00 0.00 10.50 0.00 0.008 7.158.00 0.00 11.00 0.00 0.000 7.158.00 0.00 11.50 0.00 0.000 7.158.00 0.00 12.00 3.10 0.018 7,158.34 0.00 12.50 33.15 0.679 7.160.23 13.54 13.00 16.79 8.998 7,160'83 18.61 13.50 9.37 0.782 7.180.45 15.73 14.00 6.61 0.564 7.180.00 11.00 14.50 5.14 0.423 7,159.71 7.68 15.00 4.47 0.348 7,159.53 5.80 15.50 4.05 0.305 7,159.43 4.80 16.00 3.65 0.279 7.159 38 4.18 16.50 3.26 0.258 7,159.30 3.71 17.00 3.02 0.242 7.158 28 3.34 17.50 2.86 0.231 7,159.23 3.09 18.00 2.71 0.223 7,159.20 2.80 18.50 2.56 0.215 7.159.18 2.74 19.80 2.41 0.208 7.1E9.16 2.58 19.50 2.25 0.201 7.159.14 2.43 20.00 2.09 0.193 7.159.13 2.27 20.50 1.94 0.188 7.158.10 2.12 21.00 1.86 0.179 7.159.08 1.99 21.50 1.83 0.175 7.159.08 1.91 22.00 1.80 0.172 7.159.08 1.85 22.50 1.77 0.171 7,159.05 1.81 23.00 1.74 0.169 7.159.04 1.78 23.50 1.72 0167 7.159.04 1.75 24.00 1.69 0.166 7.159.03 1.72 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 12 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Stage -Discharge for Pond 44P: Pond -O Elevation Primary Elevation Primary Elevation Primary Elevation Primary (feet) cfs) (feet) (cfs) (feet) (cfs) (feet) (cfsl 7,158.00 0.00 7,159.06 1,88 7,160.12 12.33 7,161.18 21.01 7,158.02 0.00 7,159.08 2.01 7,160.14 12.55 7,161.20 21.14 7,158, 04 0.00 7,159.10 2.14 7,160.16 12.78 7,161.22 21.26 7,1' 58.06 0.00 7,159.12 2.28 7,160.18 13.00 7,161.24 21.39 7,158.08 0.00 7,159.14 2.42 7,160.20 13.22 7,161.26 21.52 7,158.10 0.00 7,159.16 2.57 7,160.22 13.44 7,161.28 21.64 7,158.12 0.00 7,159.18 2.71 7,160.24 13.66 7,161.30 21.76 7,158.14 0.00 7,159.20 2.86 7,160.26 13.88 7,161.32 21.89 7,158,16 0.00 7,159.22 3,02 7,160.28 14.09 7,161.34 22.01 7,158,18 0,00 7,159.24 3.18 7,160.30 14.30 7,161.36 22.13 7,158.20 0.00 7,159.26 3.34 7,160,32 14.51 7,161.38 22.25 7,158.22 0.00 7,159.28 3.50 7,160.34 14.71 7,161.40 22.38 7,158.24 0.00 7,159.30 3.67 7,160.36 14.92 7,161,42 22.50 7,158.26 0.00 7,159.32 3.84 7,160.38 15.11 7,161.44 22.61 7,158.28 0.00 7,159.34 4.02 7,160.40 15.31 7,161.46 22.73 7,158.30 0.00 7,159.36 4.19 7,160.42 15.50 7,161.48 22.85 7,158.32 0.00 7,159.38 4.37 7,160.44 15.68 7,161.50 22.97 7,158.34 0.00 7,159.40 4.55 7,160.46 15.86 7,161.52 23.09 7,158.36 0.00 7,159.42 4.74 7,160.48 16.03 7,161.54 23.20 7,158.38 0.00 7,159.44 4.93 7,160.50 16.19 7,161.56 23.32 7,158.40 0.00 7,159.46 5.12 7,160.52 16.35 ` 7,161.58 23.43 7,158.42 0.00 7,159.48 5.31 7,160.54 16.49 ! 7,161.60 23.55 7,158.44 0.00 7,159.50 5.51 7,160.56 16.62 7,161.62 23.66 7,158.46 0.00 7,159.52 5.71 7,160.58 16.74 7,161.64 23.78 7,158.48 0.00 7,159.54 5.91 7,160.60 16.89 7,161.66 23.89 7,158.50 0.00 7,159.56 6.11 7,160.62 17.04 7,161.68 24.00 7,158.52 0.00 7,159,58 6.31 7,160.64 17.20 7,161.70 24.11 7,158.54 0.01 7,159.60 6.52 7,160.66 17.36 7,161.72 24.22 7,158.56 0.02 7,159.62 6.73 7,160.68 17.51 7,161.74 24.34 7,158.58 0,04 7,159.64 6.94 7,160.70 17.67 7,161.76 24.45 7,158.60 0.06 7,159.66 7.15 7,160.72 17.82 7,161.78 24.56 7,158.62 0.09 7,159.68 7.37 7,160.74 17.97 7,161.80 24.67 7,158.64 0.13 7,159.70 7.58 7,160.76 18.12 7,161.82 24.77 7,158.66 0,16 7,159.72 7.80 7,160.78 18.27 7,161.84 24.88 7,158.68 0.21 7,159.74 8.02 7,160.80 18.41 7,161.86 24.99 7,158.70 0.25 7,159.76 8.24 7,160.82 18.56 7,161.88 25.10 7,158.72 0.31 7,159.78 8.46 7,160.84 18,70 7,161.90 25.21 7,158.74 0.36 7,159.80 8.68 7,160.86 18.85 7,161.92 25.31 7,158.76 0.43 7,159.82 8.91 7,160.88 18.99 7,161.94 25.42 7,158.78 0.49 7,159.84 9.13 7,160.90 19.13 7,161.96 25.52 7,158.80 0.56 7,159.86 9.36 7,160.92 19.27 7,161.98 25.63 7,158.82 0.64 7,159.88 9.59 7,160.94 19.41 7,162.00 25.73 7,158.84 0.72 7,159.90 9.81 7,160.96 19.55 7,158.86 0.80 7,159.92 10.04 7,160.98 19.68 7,158.88 0.89 7,159.94 10.27 7,161.00 19.82 7,158.90 0.99 7,159,96 10.50 7,161,02 19.96 7,158.92 1.08 7,159.98 10.73 7,161.04 20.09 7,158.94 1.18 7,160.00 10.96 7,161.06 20.22 7,158.96 1.29 7,160.02 11.19 7,161.08 20.36 7,158.98 1.40 7,160.04 11.41 7,161.10 20.49 7,159.00 1,51 7,160.06 11.64 7,161.12 20.62 7,159.02 1.63 7,1 60.08 11.87 7,161.14 20.75 7,159.04 1.75 7,160.10 12.10 7,161.16 20.88 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Type 0�4-�rY0O\��y 70' ������~�����K9|�����OK���� Rainfall=2.70" 13 (�8O0b8��Associates, Inc. Page Prepared by HydnoCADO8.0D sin 004370 ©2OQ0 HydroCAD Software Solutions LLC 3A8C2007 StageArea-Storage for Pond 44P: Pond -0 Elevation Surface Storage Elevation Surface Storage � (feet) (acres) (acre-feet) (feeU (acres)(acre-feet) I 7�58�UO D.000 O.D0U 7.1�0.�5 O.S40 0�GO1 7'158 O5 0.016 0.000 7,160.70 0.542 0.928 7,158.10' 0.031 8.002 7,160.75 0.545 0.955 0.046 0.003 7.100.80 0.548 0.983 I 7,158.157,158.20 0.062 0.006 7,160.85 0.551 1.010 7,158.25 0.078 0.010 7.180.90 0.553 1.038 7,158.30 0.093 0.014 7.160.95 0.556 1.066 I 7,158.35 15B 3� D 180 7,161.00 0 5G9 1.D93 . � . 0.019. 7,158.40�--0.124 0.025 7,161.05 0.562 1.122 .158/45 0.139 0]}31 7.181.10 0.565 1.150 � O155 0.039 7,161.15 O.567 1 178 7,158.50 �. I 7. 5B�� 11. U�47 7.181�JO O.57O 1�D8 7,158.60 0.186 0.056 7,161.25O�573 1.235 '' 0.201 0.065 | 7,161.30 0.57678 1.264�4 7,158.657 1�l7O 0.217 0.076 7,161.35 0.579 1.2938� I158.75 0.233 0.087 7.1G1.4D 0.581 1.322 7,158.80' 0.248 0l99 7,161.45 0.584 1.351 7158�85 0.264 0.112 7,181.50 0.507 1.880 I 7'1S8j30 0.279O128 7,161.55O.5�O 1.409 7,158.95` 0.294 0.140 7,161.60 0.593 1.439� '1SQ.OD 0.310 0.155 7,161.65 0.595 1.4697,159.050.32O 0.171 7,161.700.598 1.499 7'15S18 0.329 0.187 7,161.75 0.601 1.529 1 7''159.16 0.338 0.204 7.101.80 0.004 1.559 7'159.20 0.349 0.221 7.161.85 0.607 1.589 7158.25 0.359 0.239 7.181.90 0.809 1.610 I 7`15A�3O O.3G8 O.�5J 7.181.S5 0.812 1.850 7'150.35 0.378 0.275 7^162.00 0.615 1.681 7 15Q.50 7'159�4O 0.388 0,295 N� 7'1597,159.45O.397 0.4070314 �� 0.334 7`159.55 0.417 0.355 7.159.60 0.426 0.376 I7,159.65 0.436 0.397 7,159,70 0.448 0.420 7.159.75 0.456 0.442 7.159.80 0.485 0.465I7.159.85 0.475 0.489 7.169.90 8.485 0.513 7.159.95 0.494 0.537 7.180.00 0.604 0.562 I7.180.05 0.507 0.587 7.160.10 0.510 0.613 I7.18O.15 O.S12 D�09Q 7,160.20 0.G15 0.684 7.160.25 0.518 0.890 7.180.30 0.521 0.716 7.180.35 0.523 0.742 N� 7,160.40 0.526 0.768 -- 7.18045 0.529 0.794 7.160.50 0.532 0.821 7.160.55 0.534 0.848 I7.18O.HO O.�37 0.874 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 14 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Link 46L: O -Outfall Inflow Area = 123.711 ac, Inflow Depth > 0.53" for 100 Year event Inflow = 19.94 cfs @ 12.89 hrs, Volume= 5.495 af Primary = 19.94 cfs 12.89 hrs, Volume= 5.495 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 46L: O -Outfall Hydrograph 22 21 20= 19. 18 17 16_ 15- 14 13 1 : 12. • 11 T. • 101 9= 8m 7' 5 3- 21 1= 0 Inflow Area=123.711 ac ter.., ,....,. r,....,....,. T.,...;,. 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) —Innow — Primary 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. HydroCAC08.0U sin 084370 02808HvdnoCAOSoftware Solutions LLC Hydrograph for Link 46L: O -Outfall Type II24-hrY00Year Fainfall=2.70" Page 15 3/6/2007 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0\00 0.00 0.25 0.00 0.00 0.00 0.50 0.00 0.00 0.00 0.75 0.00 0.00 0.00 1.00 0.08 0.00 0.00 1.25 0.00 0.00 0.00 1.50 0.00 0.00 0.00 1.75 8.00 0.00 0.00 2O0 0.00 0.08 0.00 2.25 0.00 0.00 0.00 2.50 0.00 0.00 0.00 2.75 0.00 0.00 0.00 3.00 0.00 0.00 0.00 3.25 0.00 0.00 0.00 3.50 0.00 0.00 0.00 3.75 0.00 0.00 0.00 4.00 0.00 0.00 0.00 4.25 0.00 0.00 0.00 4.50 0.00 0.00 0.00 4.75 0.00 0.00 0.00 5.00 0.00 0.00 0.00 5.25 0.00 0.00 0.00 5.50 0.88 0.80 0,00 5.75 0.00 0.00 0.00 6.00 0.00 0.00 0.00 6.25 0.00 0.00 0.00 6.50 8.00 0.00 0.00 6.75 0.00 0.00 0.00 7.00 0.00 0.80 0.00 7.25 0.00 0.00 0.00 7.50 0.00 0.00 0.00 7.75 0.00 0.00 0.00 8.00 0.00 8.00 0.00 8.25 0.00 0.00 0.00 8.50 0.00 0.00 0.00 8.75 0.00 0.00 0.00 9.00 0.00 0.00 0.00 9.25 0.00 0.00 0.00 8.50 0.00 8.00 0.00 9.75 0.00 0.08 0.00 10.00 0.00 0.00 0.00 10.25 0.00 0.00 0.00 10.60 0.00 0.00 0.00 1075 0.00 0.00 0.00 11.00 0.00 0.00 0.00 11.25 0.00 0.00 0.00 11.50 0.00 0.00 0.00 11.75 0.00 0.00 0.00 12.00 2.22 0.00 2.22 12.25 8.04 0.00 8.04 12.50 15.86 0.00 15.86 12.75 19.57 0.00 19.57 13.00 19.79 0.00 19.79 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 13.25 18.52 0.00 18.52 13.50 16.63 0.00 16.63 13.75 14.10 0.00 14.10 14.00 11.74 0.00 11.74 14.25 9.81 0]08 9.81 14.50 8.31 0.00 8.31 14.75 7.20 0.00 7.20 15.00 8.88 0.00 6.38 15.25 5.79 0.00 5.79 15.50 5.34 0.00 5.34 15.75 4.98 0.00 4.98 18.00 4.87 0.00 4,87 16.25 4.39 0.00 4.39 16.60 4.15 0.00 4.15 16.75 3.94 0.00 3.94 17.00 3.76 0D0 3.76 17.25 3.62 0.00 3.62 17.50 3.49 0.00 3.49 17J5 3.38 0.00 3.38 18.00 3.28 0.00 3.28 18.25 3.19 0.00 3.19 18.50 3.10 0.00 3.10 18.75 3.01 0.00 3.01 19.00 2.92 0I0 2.92 19.25 2.84 0.00 2.84 19.50 2.75 0.00 2.75 19.75 2]66 0.00 2.66 28.00 2.57 0.00 2.57 20.25 2.48 0.00 2.48 20.50 2.40 0.00 2.40 20.75 2.32 0.00 2.32 21.00 2.26 0.00 2.26 21.25 2.21 0.00 2.21 21.50 218 0l0/ 2.18 21.75 215 0.00 2.15 22.00 2.12 0i00 2.12 22.25 2.10 0.00 2.10 22.50 2.08 0.00 2.08 22.75 2.06 0.00 2.08 23.00 2.04 0.00 2.04 23.25 2.02 0.00 2.02 2350 2.01 0i08 2.01 23.75 1.99 0.00 1.99 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 16S 1 Area P-1 PRE 1 1 1 1 1 (Subcatt \ Reach Link Drainage Diagram for Pre -Development Prepared by Ganiba & Associates, Inc. 316/2007 kiydroCAD® 8.00 sin 004370 © 2406 HydroGAD Software Solutions LLC 1 Pre -Development Prepared by Garnba & Associates, Inc. Page 2 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2D07 Area Listing (selected nodes) Area (acres) CN Description (subcats) 133.940 56 Brush, Fair, HSG B (16S) 46.250 69 Pasture/grassland/range, Fair, HSG B (16S) 48.500 70 Brush, Fair, HSG C (16S) 228.690 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Type 11 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=5.00-24.00 hrs, dt=0.05 hrs, 381 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Star -Ind method Subcatchment 16S: Area P-1 Runoff Area=228.690 ac Runoff Depth>0.28" Flow Length=9,174' Tc=44.8 min CN=62 Runoff=22.69 cfs 5.313 af Total Runoff Area = 228.690 ac Runoff Volume = 5.313 af Average Runoff Depth = 0.28" 100.00% Pervious Area = 228.690 ac 0.00% Impervious Area = 0.000 ac Pre -Development Type 11 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 4 HydroCAD® 8.00 sin 004370 0 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 165: Area P-1 Runoff - 22.69 cfs @ 12.60 hrs, Volume= 5.313 af, Depths 0.28" Runoff by SCS TR -20 method, UH=SCS, Time Span= 5.00-24.00 hrs Type 1124 -hr 100 YEAR Rainfall=2.70" Area (ac) CIV Description dt= 0.05 hrs 133.940 56 Brush, Fair, HSG B 48.500 70 Brush, Fair, HSG C 46.250 69 Pasture/ rassland/range, Fair, HSG B 228.690 228.690 62 Weighted Average Pervious Area Tc Length Slope (min) (feet) (ft/ft) Velocity Capacity (ft/sec) (cfs) Description 13.3 1.3 30.2 100 0.2047 518 0.1684 8,556 0.0631 0.13 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 1.30" 6.61 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 4.73 5.20 Channel Flow, Area= 1.1 sf Perim= 4.7' r= 0.23' n= 0.030 44.8 9,174 Total Subcatchment 16S: Area P-1 Hydrograph 25' 24- 23= 22 214. 20 18= 17 164 15= 14 134 c 12= L 11= 10: 9.s 8= 7 5- 4= 3- 2= 1= 22.69 cfs Type 11 24-hr 100 YEAR Rainfall=2.70" Runoff Area=228.690 ac Runoff Volume=5.313 of Runoff Depth>0.28" Flow Length=9,174' Tc=44.8 min CN=62 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sln 004370 0 2006 HydroCAD Hydrograph for I Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.17 0.00 0.00 5.25 0.18 0.00 0.00 1 5.50 0.19 0.00 0.00 5.75 0.20 0.00 0.00 6.00 0.22 0.00 0.00 6.25 0.23 0.00 0.00 U 6.50 0.24 0.00 0.00 6.75 0.25 0.00 0.00 7.00 0.27 0.00 0.00 7.25 0.28 0.00 0.00 111 7.50 0.29 0.00 0.00 7.75 0.31 0.00 0.00 8.00 0.32 0.00 0.00 I 8.25 0.34 0.00 0.00 8.50 0.36 0.00 0.00 8.75 0,38 0.00 0.00 9.00 0.40 0.00 0.00 I 9.25 0.42 0.00 0.00 9.50 0.44 0.00 0.00 9.75 0.46 0.00 0.00 10.00 0.49 0.00 0.00 I 10.25 0.52 0.00 0.00 10.50 0.55 0.00 0.00 10.75 0.59 0.00 0.00 I 11.00 0.63 0.00 0.00 11.25 0.69 0.00 0.00 11.50 0.76 0.00 0.00 11.75 1.04 0.00 0.00 I 12.00 1.79 0.05 0.54 12.25 1.91 0.07 10.45 12.50 1.98 0.08 21.84 12.75 2.04 0.10 20.82 I 13.00 2.08 0.11 16.12 13.25 2.12 0.11 12.81 13.50 2.16 0.12 10.66 13.75 2.19 0.13 9.19 I 14.00 2.21 0.14 8.13 14.25 2.24 0.14 7.28 14.50 2.26 0.15 6.59 I 14.75 2.28 0.16 6.13 15.00 2.30 0.16 5.82 15.25 2.32 0.17 5.57 15.50 2.34 0.17 5.34 I 15.75 2.36 0.18 5.11 16,00 2.38 0.18 4.87 16.25 2.39 0.19 4.63 16.50 2.41 0.19 4.40 I 16.75 2.42 0.19 4.23 17.00 2.43 0.20 4.11 17.25 2.45 0.20 4.01 I 17.50 2.46 0.21 3.93 17.75 2.47 0.21 3.84 18.00 2.49 0.22 3.75 1 Type 11 24 -hr 100 YEAR Rainfall=2.70" Page 5 Software Solutions LLC 3/6/2007 Subcatchment 16S: Area P-1 Time Precip. Excess Runoff (hours) (inches)Jinches) (cfs) 18.25 2.50 0.22 3.66 18.50 2.51 0.22 3.57 18.75 2.52 0.23 3.47 19.00 2.53 0.23 3.37 19.25 2.54 0.23 3.28 19.50 2.55 0.24 3.17 19.75 2.56 0.24 3.07 20.00 2.57 0.24 2.96 20.25 2.58 0.24 2.85 20.50 2.59 0.25 2.75 20.75 2.60 0.25 2.69 21.00 2.60 0.25 2.65 21.25 2.61 0.26 2.63 21.50 2.62 0.26 2.61 21.75 2.63 0.26 2.59 22.00 2.64 0.26 2.58 22.25 2.65 0.27 2.56 22.50 2.65 0.27 2.55 22.75 2.66 0.27 2.53 23.00 2.67 0.28 2.51 23.25 2.68 0.28 2.50 23.50 2.68 0.28 2.48 23.75 2.69 0.28 2.47 24.00 2.70 0.29 2.45 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Subcat Reach <48S> <49S> P-Bypass Link Area P U Pond P-1 D 50L P-1 Outfall Drainage Diagram for Post -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydrDCAD® 6.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 1 Post -Development Prepared by Gamba & Associates, Inc. Page 2 HydroCAD® 8.00 sin 004370 a 2006 HydroCAD Software Solutions LLC 3/6/2007 Area Listing (selected nodes) 1 Area (acres) CN Description (subcats) 128.660 56 Brush, Fair, HSG B (48S,49S) 1.470 61 >75% Grass cover, Good, HSG B (485,495) 38.130 69 Pasture/grassland/range, Fair, HSG B (485,495) 42.010 70 Brush, Fair, HSG C (485) 1.040 74 >75°/0 Grass cover, Good, HSG C (48S) 19.010 98 Paved parking & roofs (48S,49S) 230.320 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type!! 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCADO 8.00 sin 004370 O 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 48S: Area P Subcatchment 49S: P -Bypass Pond 47P: Pond P-1 Link 50L: P-1 Outfall Runoff Area=201.590 ac Runoff Depth>0.37" Flow Length=7,962' Tc=21.3 min CN=65 Runoff=53.11 cfs 6.253 af Runoff Area=28.730 ac Runoff Depth>0.26" Tc=5.0 min CN=61 Runoff=8.30 cfs 0.618 af Peak Elev=7,040.67' Storage=1.135 af Inflow=53.11 cfs 6.253 af Outflow=19.52 cfs 6.148 af inflow=20.79 cfs 6.766 af Primary=20.79 cfs 6.766 af Total Runoff Area = 230.320 ac Runoff Volume = 6.870 af Average Runoff Depth = 0.36" 91.75% Pervious Area = 211.310 ac 8.25% Impervious Area = 19.010 ac Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Garnba & Associates, Inc. Page 4 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatchment 48S: Area P Runoff = 53.11 cfs @ 12.20 hrs, Volume= 6.253 af, Depth> 0.37" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 Year Rainfall=2.70" Area (c) CN Description 107.500 56 42.010 70 32.460 69 1.190 61 1.040 74 17.390 98 Brush, Fair, HSG B Brush, Fair, HSG C Pasture/grassland/range, Fair, HSG B >75% Grass cover, Good, HSG B >75% Grass cover, Good, HSG C Paved •arkin. & roofs 201.590 65 Weighted Average 184.200 Pervious Area 17.390 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.8 100 0.2047 0.19 Sheet Flow, Grass: Dense n= 0.240 P2= 1.30" 1.4 537 0.1625 6.49 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 11.1 7,325 0.0639 10.97 12.07 Channel Flow, Area= 1.1 sf Perim= 4.7' r= 0.23' n= 0.013 Corrugated PE, smooth interior 21.3 7,962 Total 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC_, Subcatchment 48S: Area P Hydragraph Type 1124 -hr 100 Year Rainfall=2.70" Page 5 3/6/2007 n 0 w 55 50 45 40 35 30 25-- 20-- 15- 10 0 53.11 cfs 1 Type 11 24 -hr 100 Year Rainfall=2.70" Runoff Area=201.590 ac Runoff Volume=6..253 of Runoff Depth>0.37" Flow Length=7,962' Tc=21.3 min CN=65 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff Post -Development Prepared by Gamba & Associates, inc. HydroCAD® 8.00 sin 004370 0 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfall=2.70" Page 6 316/2007 Hydrograph for Subcatchment 48S: Area P Time Precip. Excess Runoff (,hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0,00 0.25 0.01 0.00 0.00 0.50 0.01 0.00 0.00 0.75 0.02 0.00 0.00 1.00 0.03 0.00 0.00 1.25 0.04 0.00 0.00 1.50 0.04 0.00 0.00 1.75 0.05 0.00 0.00 2.00 0.06 0.00 0.00 2.25 0.07 0.00 0.00 2.50 0.08 0.00 0.00 2.75 0.08 0.00 0.00 3.00 0.09 0.00 0.00 3.25 0.10 0.00 0.00 3.50 0.11 0.00 0.00 3.75 0.12 0.00 0.00 4.00 0.13 0.00 0.00 4.25 0.14 0.00 0.00 4.50 0.15 0.00 0.00 4.75 0.16 0.00 0.00 5.00 0.17 0,00 0.00 5.25 0.18 0.00 0.00 5.50 0.19 0.00 0.00 5.75 0.20 0.00 0.00 6.00 0.22 0.00 0.00 6.25 0.23 0.00 0.00 6.50 0.24 0.00 0.00 6.75 0.25 0.00 0.00 7.00 0.27 0.00 0.00 7.25 0.28 0.00 0.00 7.50 0.29 0.00 0.00 7.75 0.31 0.00 0.00 8.00 0.32 0.00 0.00 8.25 0.34 0.00 0.00 8.50 0.36 0.00 0.00 8.75 0.38 0.00 0.00 9.00 0.40 0.00 0.00 9.25 0.42 0.00 0.00 9.50 0.44 0.00 0.00 9.75 0.46 0.00 0.00 10.00 0.49 0.00 0.00 10.25 0.52 0.00 0.00 10.50 0.55 0.00 0.00 10.75 0.59 0.00 0.00 11.00 0.63 0.00 0.00 11.25 0.69 0.00 0.00 11.50 0.76 0.00 0.00 11.75 1.04 0.00 0.00 12.00 1,79 0.08 13.49 12.25 1.91 0.11 50.27 12.50 1.98 0.13 26.02 12.75 2.04 0.15 16.34 13.00 2.08 0.16 12.39 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 13.25 2.12 0.17 10.38 13.50 2.16 0.18 9.19 13.75 2.19 0.19 8.24 14.00 2.21 0.20 7.45 14.25 2.24 0.21 6.75 14.50 2.26 0.21 6.36 14.75 2.28 0.22 6.11 15.00 2.30 0.23 5.87 15.25 2.32 0.23 5.62 15.50 2.34 0.24 5.37 15.75 2.36 0.25 5.09 16.00 2.38 0.25 4.81 16.25 2.39 0.26 4.54 16.50 2.41 0.26 4.39 16.75 2.42 0.27 4.29 17.00 2.43 0.27 4.20 17.25 2.45 0.28 4.10 17.50 2.46 0.28 4.01 17.75 2.47 0.29 3.91 18,00 2.49 0.29 3.81 18.25 2.50 0.30 3.71 18.50 2.51 0.30 3.60 18.75 2.52 0.31 3.49 19.00 2.53 0.31 3.38 19.25 2.54 0.31 3.27 19.50 2.55 0.32 3.16 19.75 2.56 0.32 3.04 20.00 2.57 0.32 2.92 20.25 2.58 0.33 2.81 20.50 2.59 0.33 2.76 20.75 2.60 0.33 2.74 21.00 2.60 0.34 2.72 21.25 2.61 0.34 2.70 21.50 2.62 0.34 2.69 21.75 2.63 0.35 2.67 22.00 2.64 0.35 2,65 22.25 2.65 0.35 2.63 22.50 2.65 0.36 2.62 22.75 2.66 0.36 2.60 23.00 2.67 0.36 2.58 23.25 2.68 0.37 2.56 23.50 2.68 0.37 2.54 23.75 2.69 0.37 2.52 24.00 2.70 0.38 2.50 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 7 HydroCAD® 8.00 sin 004370 © 2006 Hy iroCAD Software Solutions LLC 3/6/2007 Subcatchment 49S: P -Bypass [49] Hint: Tcc2dt may require smaller dt Runoff = 8.30 cfs @ 12.00 hrs, Volume= 0.618 af, Depths 0.26" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type Il 24 -hr 100 Year Rainfal1=2.70" Area (ac) CN Description 21.160 56 Brush, Fair, HSG B 5,670 69 Pasture/grassland/range, Fair, HSG B 0.280 61 >75% Grass cover, Good, HSG B 1.620 98 Paved parkinq & roofs 28.730 61 Weighted Average 27.110 Pervious Area 1.620 Impervious Area Tc min 5.0 U 3 0 u_ Length Slope Velocity Capacity Description feet ft/ft ftisec cfs Direct Entry, Subcatchment 49S: P -Bypass Hydrograph 2- 8.30 cfs 1 Type 11 24 -hr 100 Year Rainfall=2.70„ Runoff Area=28.730 ac Runoff Volume=0.618 of Runoff Depth>0.26" Tc=5.0 min CN=61 0 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff Post -Development Type II 24 -hr 100 Year Rainfall=2.70" Prepared by Garnba & Associates, Inc. Page 8 HydroCADO 8.00 sin 004370 0 2006 HydroCAD Software Solutions LLC 3/6/2007 Hydrograph for Subcatchment 49S: P -Bypass Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.25 0.01 0.00 0.50 0.01 0.00 0.75 0.02 0.00 1.00 0.03 0.00 t25 0.04 0.00 1.50 0.04 0.00 1.75 0.05 0.00 2.00 0.06 0.00 2.25 0.07 0.00 2.50 0.08 0.00 2.75 0.08 0.00 3.00 0.09 0.00 3.25 0.10 0.00 3.50 0.11 0.00 3.75 0.12 0.00 4,00 0.13 0.00 4.25 0.14 0.00 4.50 0.15 0.00 4.75 0.16 0.00 5.00 0.17 0.00 5.25 0.18 0.00 5.50 0.19 0.00 5.75 0.20 0.00 6.00 0.22 0.00 6.25 0.23 0.00 6.50 0.24 0.00 6.75 0.25 0.00 7.00 0.27 0.00 7.25 0.28 0.00 7.50 0.29 0.00 7.75 0.31 0.00 8.00 0.32 0.00 8.25 0.34 0.00 8.50 0.36 0.00 8.75 0.38 0.00 9.00 0.40 0.00 9.25 0.42 0.00 9.50 0.44 0.00 9.75 0.46 0,00 10.00 0.49 0.00 10.25 0.52 0.00 10.50 0.55 0.00 10.75 0.59 0.00 11.00 0.63 0.00 11.25 0.69 0.00 11.50 0.76 0.00 11.75 1.04 0.00 12.00 1.79 0.04 12.25 1.91 0.06 12.50 1.98 0.07 12.75 2.04 0.08 13.00 2.08 0.09 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 8.30 2.06 1.51 1.21 1.06 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 13.25 2.12 0.10 0.95 13.50 2.16 0.11 0.86 13.75 2.19 0.11 0.79 14.00 2.21 0.12 0.72 14.25 2.24 0.13 0.68 14.50 2.26 0.13 0.66 14.75 2.28 0.14 0.64 15.00 2.30 0,14 0.61 15.25 2.32 0.15 0.59 15.50 2.34 0.15 0.56 15.75 2.36 0.16 0.53 16.00 2.38 0.16 0.50 16.25 2.39 0.16 0.48 16.50 2.41 0.17 0.47 16.75 2.42 0.17 0.47 17.00 2.43 0.18 0.46 17.25 2.45 0.18 0.45 17.50 2.46 0.18 0.44 17.75 2.47 0.19 0.43 18.00 2.49 0.19 0.42 18.25 2.50 0.20 0.40 18.50 2.51 0.20 0.39 18.75 2.52 0.20 0.38 19.00 2.53 0.21 0.37 19.25 2.54 0.21 0,36 19.50 2.55 0.21 0,34 19.75 2.56 0.21 0.33 20.00 2.57 0.22 0.32 20.25 2.58 0.22 0.31 20.50 2.59 0.22 0.31 20.75 2.60 0.23 0.31 21.00 2.60 0.23 0.31 21.25 2.61 0.23 0.31 21.50 2.62 0.23 0.30 21.75 2.63 0.24 0.30 22.00 2.64 0,24 0.30 22.25 2.65 0,24 0.30 22.50 2.65 0.24 0.30 22.75 2.66 0,25 0.30 23.00 2.67 0.25 0.29 23.25 2.68 0.25 0.29 23.50 2.68 0.25 0.29 23.75 2.69 0.26 0.29 24.00 2.70 0.26 0.28 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 1124 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 9 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Pond 47P: Pond P-1 Inflow Area = 201.590 ac, Inflow Depth > 0.37" for 100 Year event Inflow = 53.11 cfs @ 12.20 hrs, Volume= 6.253 of Outflow = 19.52 cfs @ 12.65 hrs, Volume= 6.148 af, Atten= 63%, Lag= 26.9 min Primary - 19.52 cfs @ 12.65 hrs, Volume= 6.148 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 7,040.67' @ 12.65 hrs Surf.Area= 0.726 ac Storage= 1.135 af Plug -Flow detention time= 30.5 min calculated for 6.148 af (98% of inflow) Center -of -Mass det. time= 21.9 min ( 943.9 - 922.0 ) Volume Invert AvaiLStorage Storage Description #1 7,038.00' 2.152 af Custom Stage Data (Prismatic)Listed below Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre-feet) (acre-feet) 7,038.00 0.000 0.000 0.000 7,039.00 0.316 0.158 0.158 7,040.00 0.685 0.500 0.659 7,041.00 0.746 0.716 1.374 7,042.00 0.809 0.778 2.152 Device Routine Invert Outlet Devices #1 Primary 7,038.00' 30.0" x 44.0' long. Culvert CMP, square edge headwall, Ke= 0.500 Outlet Invert= 7,036.00' S= 0.0455 '1' Cc= 0.900 n= 0.013 #2 Device 1 7,038.00' 24.0" Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=19.52 cfs @ 12.65 hrs HW=7,040.67' (Free Discharge) '_1=Culvert (Passes 19.52 cfs of 28.12 cfs potential flow) 2=OrificelGrate (Orifice Controls 19.52 cfs @ 6.21 fps) Post -Development Type 1124 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 10 HydroCAD® 8.00 s/n 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 55 50- 45 40- 35- N U 3 D 25- Elevation (feet) 20- 15- Pond 47P: Pond P-1 Hydrograph P 53. cfs Inflow Area=201.590 ac Peak EIev=7,040.67' Storage=1.135 of 19.52 cfs 1 0 1 2 3 4 5 7,042 7.041- 7,040 . 7,039- 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pond 47P: Pond P-1 Stage -Discharge — inflow — Primary 7,0384 0 2 4 6 8 10 12 14 16 Discharge (cis) • 18 20 22 24 26 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 11 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Elevation (feet) Pond 47P: Pond P-1 Stage -Area -Storage SurfacefHorizontalfWetted Area (acres) 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 7,042 7,041 7,040 7,039 7,038 0 5 0.6 0.65 0.7 0.75 0.8 0 1 . Storage (acre-feet) — Surface — Storage Post -Development Type 1124 -hr 100 Year 70" Prepared by Gamba & Associates, Inc. Page 12 8.00HydroCADOsin U�2000Hydno�AOSofbw�roSo|utionnLUC' 3/6/2007 Hydrograph for Pond 47P: Pond P-1 Time Inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet) (cfs) 0.00 0.00 0.000 7.038.00 0.00' 0.50 0.00 0I00 7.038.00 0J00 1.00 0.00 0.030 7'038.00 0.80 1.50 0.00 0.000 7.038.00 0.00 2.00 0.00 0.000 7.038.00 0.00 2.50 0.00 0.000 7.038.00 0.00 3.00 0.00 0.000 7.038.00 0.00 3.50 0.80 0.000 7.038.00 0.00 4.00 0.00 0.800 7.038.00 0.00 4.50 0.00 0.000 7,038D0 0.00 5.00 0.00 0.000 7.038.08 0.00 5.50 0.00 0.000 7.038.00 0.00 6.00 0.00 0.080 7.038.00 0.00 6.50 0.00 0.000 7,038.00 0.00 7.00 0.00 0.000 7.038.00 0.00 7.50 0.00 0.000 7.038.00 0.00 8.00 0.00 0.000 7.038.00 0.00 8.50 0.00 0.800 7.038.08 0.00 9.00 0.00 0.800 7.038.00 0.00 9.50 0.00 0.000 7.038.80 0.00 10.00 0.00 0.800 7.038.00 0.00 10.50 0.08 0.000 7.038.00 0.00 11.00 0.00 0.000 7.038.00 0.00 11.50 0.00 0.000 7.038.00 0.00 12.00 13.49 0.052 7.038.33 0.66 13.50 26.02 1.097 7,040.61 19.21 13.00 12.39 1.018 7'040.50 18.54 13.50 9.19 0.738 7.040.11 15.95 14.00 7.45 0.490 7.039.88 12,26 14.50 6.36 0.338 7.039.38 9.82 15.00 5.87 0.257 7.039.20 7.31 15.50 5.37 0.209 7.039.10 6.33 16.00 4.81 0.172 7'030.03 5.62 16.50 4.39 0.147 7.038.93 4.68 17.00 4.20 0.140 7.038.89 4.30 17.50 4.01 0.136 7.088.88 4.09 10.00 3.81 0.133 7.038.84 3.90 18.50 3.60 0.129 7.038.81 3.70 18.00 3.38 0.125 7.038.79 3.49 19.50 3.16 0.120 7.038.76 3.26 20.00 2.92 0.116 7.038.73 3.04 20.50 2.76 0.111 7.038.71 2.83 21.00 2.72 0.110 7.038.69 2.75 21.50 2.69 0.109 7.038.69 2.70 22.00 2.65 0.108 7'038.88 2.67 22.50 2.62 0.107 7`038.88 2.63 23.00 2.58 0.108 7,038.67 2.60 23.50 2.54 0.108 7.038.87 2.66 24.00 2.50 0.105 7.038.88 2.52 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type if 24 -hr 100 Year Rainfall -2.70" Prepared by Gamba & Associates, Inc. Page 13 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Stage -Discharge for Pond 47P: Pond P-1 Elevation Primary (feet) (cfs) 7,038.00 0.00 7,038.02 0.00 7,038.04 0.01 7,038.06 0.02 7,038.08 0,04 7,038.10 0.06 7,038.12 0.09 7,038.14 0.12 7,038.16 0.16 7,038.18 0.20 7,038.20 0.25 7,038.22 0.30 7,038.24 0.36 7,038.26 0.42 7,038.28 0.48 7,038.30 0.55 7,038.32 0.62 7,038.34 0.70 7,038.36 0.79 7,038.38 0.87 7,038.40 0.96 7,038.42 1.06 7,038.44 1.16 7,038.46 1.26 7,038.48 1.37 7,038.50 1.48 7,038.52 1.59 7,038.54 1.71 7,038.56 1.83 7,038.58 1.96 7,038.60 2.09 7,038.62 2,22 7,038.64 2.36 7,038.66 2.50 7,038.68 2.64 7,038.70 2.79 7,038.72 2.94 7,038.74 3.09 7,038.76 3.25 7,038.78 3.41 7,038.80 3.57 7,038.82 3.74 7,038.84 3.91 7,038.86 4.08 7,038.88 4.25 7,038.90 4.43 7,038.92 4.61 7,038.94 4.79 7,038.96 4.97 7,038.98 5.16 7,039.00 5.35 7,039.02 5.54 7,039.04 5.73 Elevation Primary (feet) (cfs) 7,039.06 5.93 7,039.08 6.12 7,039.10 6.32 7,039.12 6.52 7,039.14 6.72 7,039.16 6.93 7,039.18 7.13 7,039.20 7.34 7,039.22 7.55 7,039.24 7.76 7,039.26 7.97 7,039.28 8.18 7,039.30 8.39 7,039.32 8.60 7,039.34 8.82 7,039.36 9.03 7,039.38 9.25 7,039.40 9.46 7,039.42 9.68 7,039,44 9.89 7,039.46 10.11 7,039.48 10.32 7,039.50 10.54 7,039.52 10.75 7,039.54 10.97 7,039.56 11.18 7,039.58 11.39 7,039.60 11.60 7,039.62 11.81 7,039.64 12.02 7,039.66 12.23 7,039.68 12.43 7,039.70 12.63 7,039.72 12.83 7,039.74 13.03 7,039.76 13.23 7,039.78 13.42 7,039.80 13.60 7,039.82 13.79 7,039.84 13.97 7,039.86 14.14 7,039.88 14.31 7,039.90 14.47 7,039.92 14.62 7,039.94 14.77 7,039.96 14.90 7,039.98 15.03 7,040.00 15.13 7,040.02 15.28 7,040.04 15.43 7,040.06 15.57 7,040.08 15.72 7,040.10 15.87 Elevation Primary (feet) (cfs) 7,040.12 16.01 7,040.14 16.15 7,040.16 16.29 7,040.18 16.43 7,040.20 16.57 7,040.22 16.71 7,040.24 16.84 7,040.26 16.98 7,040.28 17.11 7,040.30 17.25 7,040.32 17.38 7,040.34 17.51 7,040.36 17.64 7,040.38 17.77 7,040.40 17.90 7,040.42 18.03 7,040.44 18.15 7,040.46 18.28 7,040.48 18.40 7,040.50 18.53 7,040.52 18.65 7,040.54 18.77 7,040.56 18.89 7,040.58 19.01 7,040.60 19.13 7,040.62 19.25 7,040.64 19.37 7,040.66 19.49 7,040.68 19.61 7,040.70 19.72 7,040.72 19.84 7,040.74 19.95 7,040.76 20.07 7,040.78 20.18 7,040.80 20.29 7,040.82 20.41 7,040.84 20.52 7,040.86 20.63 7,040.88 20.74 7,040.90 20.85 7,040.92 20.96 7,040.94 21.07 7,040.96 21.18 7,040.98 21.29 7,041.00 21.39 7,041.02 21.50 7,041.04 21.61 7,041.06 21.71 7,041.08 21.82 7,041.10 21.92 7,041.12 22.02 7,041.14 22.13 7,041.16 22.23 Elevation Primary (feet) (cfs) 7,041.18 22.33 7,041.20 22.44 7,041.22 22.54 7,041.24 22.64 7,041.26 22.74 7,041.28 22.84 7,041.30 22.94 7,041.32 23.04 7,041.34 23.14 7,041.36 23.24 7,041.38 23.34 7,041.40 23.43 7,041.42 23.53 7,041.44 23.63 7,041.46 23.73 7,041.48 23.82 7,041.50 23.92 7,041.52 24.01 7,041.54 24.11 7,041.56 24.20 7,041.58 24.30 7,041.60 24.39 7,041.62 24.48 7,041.64 24.58 7,041.66 24.67 7,041.68 24.76 7,041.70 24.86 7,041.72 24.95 7,041.74 25.04 7,041.76 25.13 7,041.78 25.22 7,041.80 25.31 7,041.82 25.40 7,041.84 25.49 7,041.86 25.58 7,041.88 25.67 7,041.90 25.76 7,041.92 25.85 7,041.94 25.94 7,041.96 26.02 7,041.98 26.11 7,042.00 26.20 Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC Type 11 24 -hr 100 Year Rainfa11=2.70" Page 14 3/6/2007 Stage -Area -Storage for Pond 47P: Pond P-1 Elevation Surface Storage (feet) (acres) (acre-feet) 7,038.00 7,038.05 7,038.10 7,038.15 7,038.20 7,038.25 7,038.30 7,038.35 7,038.40 7,038.45 7,038.50 7,038.55 7,038.60 7,038.65 7,038.70 7,038.75 7,038.80 7,038.85 7,038.90 7,038.95 7,039.00 7,039.05 7,039.10 7,039.15 7,039.20 7,039.25 7,039.30 7,039.35 7,039.40 7,039.45 7,039.50 7,039.55 7,039.60 7,039.65 7,039.70 7,039.75 7,039.80 7,039.85 7,039.90 7,039.95 7,040.00 7,040.05 7,040.10 7,040.15 7,040.20 7,040.25 7,040.30 7,040.35 7,040.40 7,040.45 7,040.50 7,040.55 7,040.60 0.000 0.016 0.032 0.047 0.063 0.079 0.095 0.111 0.126 0.142 0.158 0.174 0.190 0.205 0.221 0.237 0.253 0.269 0.284 0.300 0.316 0.334 0.353 0.371 0.390 0.408 0.427 0.445 0.464 0.482 0.500 0.519 0.537 0.556 0.574 0.593 0.611 0.630 0.648 0.667 0.685 0.688 0.691 0.694 0.697 0.700 0.703 0.706 0.709 0.712 0.716 0.719 0.722 0.000 0.008 0.016 0.024 0.032 0.039 0.047 0.055 0.063 0.071 0.079 0.087 0.095 0.103 0.111 0.119 0.126 0.134 0.142 0.150 0.158 0.183 0.208 0.233 0.258 0.283 0.308 0.333 0.358 0.383 0.408 0.433 0.458 0.483 0.508 0.533 0.558 0.583 0.608 0.633 0.659 0.694 0.730 0.766 0.802 0.837 0.873 0.909 0.945 0.980 1.016 1.052 1.088 Elevation Surface Storage (feel) (acres) (acre-feet) 7,040.65 0.725 1.124 7,040.70 0.728 1.159 7,040.75 0.731 1.195 7,040.80 0.734 1.231 7,040.85 0.737 1.267 7,040.90 0.740 1.302 7,040.95 0.743 1.338 7,041.00 0.746 1.374 7,041.05 0.749 1.413 7,041.10 0.752 1.452 7,041.15 0.755 1.491 7,041.20 0.759 1.529 7,041.25 0.762 1.568 7,041.30 0.765 1.607 7,041.35 0.768 1.646 7,041.40 0.771 1.685 7,041.45 0.774 1.724 7,041.50 0.778 1.763 7,041.55 0.781 1.802 7,041.60 0.784 1.841 7,041.65 0.787 1.879 7,041.70 0.790 1.918 7,041.75 0.793 1.957 7,041.80 0.796 1.996 7,041.85 0.800 2.035 7,041.90 0.803 2.074 7,041.95 0.806 2.113 7,042.00 0.809 2.152 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfal1=2.70" Prepared by Gamba & Associates, Inc. Page 15 HydroCAD® 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Link 50L: P-1 Outfall Inflow Area = 230.320 ac, Inflow Depth > 0.35" for 100 Year event Inflow = 20.79 cfs @ 12.61 hrs, Volume= 6.766 af Primary = 20.79 cfs @ 12.61 hrs, Volume= 6.766 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 50L: P-1 Outfall Hydrograph 23 22= 21- 20 19 18 17' 16-- 15- 14 To-, 13- 12_ 4- 3- 2 -- Inflow Area=230.320 ac 0�....,....,.. ,....,....,....,.,..,....,....,._..,....,....,_..,,,,..,..T............ .. 0 3 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Inflow - Primary ti Post -Development Prepared by Gamba & Associates, Inc. HydroCAD® 8.00 sin 004370 02UO6HydroCADSoftware Solutions LLC Type 11 24 -hr 100 Year Rain/all=2.70" Page 16 3/6/2007 Time (hours) 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 Hydrograph for Link 50L: P-1 Outfall Inflow Elevation Primary (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.08 8.00 0.00 0.00 0.00 0.00 0.00 8.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0,00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.08 0.00 0.00 0.00 8.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 8.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.88 0.00 0.08 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.08 0.00 0.00 0.00 0.00 0.00 8.00 0.00 0.00 0.00 0.00 0.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 8.96 0.00 8.96 17.77 0.00 17.77 20.71 0.00 20.71 20.61 0.00 20.61 18.60 0.00 19.80 Time (hours) 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16,50 16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Inflow (cfs) 18.27 16.81 15.18 12,98 11.10 9.68 8.66 7.92 7.35 6.89 6.49 6.12 5.72 5.15 4.90 4.75 4.64 4.53 4.42 4.31 4.20 4.09 3,97 3.85 3.73 3.61 3.48 3.35 3.23 3.14 3.09 3.05 3.03 3.01 2.99 2.97 2.95 2.93 2.91 2.89 2.87 2.85 2.83 2.81 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 18.27 16.81 15.18 12.98 11.10 9.68 8.66 7.92 7.35 6.89 6.49 6.12 5.72 5.15 4.90 4.75 4.64 4.53 4.42 4.31 4.20 4.09 3.97 3.85 3.73 3.61 3.48 3.35 3.23 3.14 3.09 3.05 3.03 3.01 2.99 2.97 2.95 2.93 2.91 2.89 2.87 2.85 2.83 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 (Subcat Reach 20S Area P-2 PRE Link Drainage Diagram for Pre -Development Prepared by Gamba & Associates, Inc. 3/6/2007 HydroCAD® 8.00 sin 004370 CD 2006 HydroCAD Software Solutions LLC Pre -Development Prepared by Garnba & Associates, Inc. Page 2 HydroCAD® 8.00 sin 004370 ® 2006 HydroCAD Software Solutions LLC 316/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 21.480 56 Brush, Fair, HSG B (20S) 5.510 58 Meadow, non -grazed, HSG B (20S) 27.380 69 Pasture/grassland/range, Fair, HSG B (20S) 54.370 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development Type/124-hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 3 HydroCADU 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Time span=5.00-24.00 hrs, dt=0.05 hrs, 381 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 20S: Area P-2 Runoff Area=54.370 ac Runoff Depth>0.31" Flow Length=2,504' Tc=16.9 min CN=63 Runoff=12.21 cfs 1.413 af Total Runoff Area = 54.370 ac Runoff Volume = 1.413 af Average Runoff Depth = 0.31" 100.00% Pervious Area = 54.370 ac 0.00% Impervious Area = 0.000 ac Pre -Development Type 11 24 -hr 100 YEAR Rainfall=2.70" Prepared by Gamba & Associates, Inc. Page 4 HydroCADQ 8.00 sin 004370 © 2006 HydroCAD Software Solutions LLC 3/6/2007 Subcatehment 205: Area P-2 Runoff = 12.21 cfs @ 12.15 hrs, Volume= 1.413 af, Depths 0.31" Runoff by SCS TR -20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type 1124 -hr 100 YEAR Rainfall=2.70" Area (ac) CN Description 21.480 56 27.380 69 5.510 58 Brush, Fair, HSG B Pasture/grassland/range, Fair, HSG B Meadow, non -grazed, HSG B 54.370 63 Weighted Average 54.370 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ftlsec) (cfs) 8.5 100 0.0880 0.20 8.4 2,404 0.0868 4.74 16.9 2,504 Total Sheet Flow, Grass: Short n= 0.150 P2= 1.30" Shallow Concentrated Flow, Unsaved Kv= 16.1 fss Subcatchment 205: Area P-2 Hydrograph 13 12, 11= 0 LL 6 0- 12.21 cfs Type II 24 -hr 100 YEAR Rainfall=2.70" Runoff Area=54.370 ac Runoff Volume=1.413 of Runoff Depth>0.31 " Flow Length=2,504' \\\%.,...„ Tc=1 fi.9 min CN=63 7 8 9 10 11 12 13 14 15 16 17 Time (hours) 18 19 20 21 22 23 24 -- Runoff 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Pre -Development PreGamba & Associates, Inc. |�'CACOared '.0Os/nO0430© 2006 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 20S: Area P-2 Type 11 24 -hr 100 YEAR Rainfall=2.70" Page 5 3/6/2007 Time Precip. Excess (hours) (inches) (inches) 5.00 0.17 0.00 5.25 0.18 0.00 5.50 0.19 0.00 5.75 0.20 0.00 0.00 0.22 0.00 6.25 0.23 0.00 6.50 0.24 0.00 6.75 0.25 0.00 7.00 0.27 0.00 7.25 028 0.00 7.80 0.29 0.00 7.75 0.31 0.00 8.00 0.32 0.80 8.25 0.34 0.00 8.50 0.36 0.00 8.75 0.38 0.00 9.00 0.40 0.80 9.25 0.42 0.00 9.50 0.44 0.00 0J5 0/6 0.00 10.00 0.49 0.00 10.25 0.52 0.00 10.50 0.55 0.00 10.75 0.59 0.00 11.00 0.63 0.00 11.25 0.89 0.00 11.50 0.76 0.00 11.75 1.04 0.00 12.00 1.79 0.06 12.25 1.91 0.08 12.50 1.98 010 12.75 2.04 0.11 13.00 2.08 0.12 13.25 2.12 0.13 13.50 2.16 0i14 13.75 219 0.15 14D0 2.21 0.10 14.25 2.24 0L18 14.50 2.26 0.17 14.75 2.28 0.18 15.80 2.30 0.18 15.25 2.32 0.19 15.50 2.34 0.19 15.75 2.36 0.20 16.80 2.38 0.20 16.25 2.39 0.21 16.50 2.41 0.21 16.75 2.42 0.22 17.00 2.43 0.22 17.25 2.45 0.23 17.50 2.46 0.23 17.75 2.47 0.24 18.00 2.49 0.24 Runoff (ds) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.06 9.41 4.90 3.27 2.67 2.31 2.08 1.87 1.70 1.55 1.48 1.43 1.38 1.32 1.26 1.20 1.13 1.07 1.04 1.02 1.00 0.98 0.96 0.93 0.91 Time Precip. Excess (hours) (inches) (inches) 18.25 2.50 0.24 18.50 2.51 0.25 18.75 2.52 0.25 19.00 2.53 0.25 19.25 2.54 0.26 19.50 2.55 0.28 19.75 2.56 0.20 20.00 2.57 0.27 20.25 2.58 0.27 20.50 2.69 0.27 20.76 2.80 0.28 21.00 2.60 0.28 21.25 2.61 0.28 21.50 2.62 0.29 21.75 2.63 0.29 22.00 2.64 0.29 22.25 2.65 029 22,50 2.65 0.30 22.75 2.66 0.30 23.00 2.67 0.30 23.25 2.88 0.31 23.50 2.68 0.31 23.75 2,69 0.31 24.00 2.70 0.31 Runoff (cfs) 0.89 0.86 0.83 0.81 0.78 0.75 0.73 0.70 0.67 0.67 0.66 0.66 0.65 0.65 0.65 0.64 0.64 0.63 0.63 0.63 0.62 0.62 0.61 0.61 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Subcat) Reach <51S> Are P-2 P-2-Bypas 6 Link Pon -P-2 U 53L P-2 Outfall Drainage Diagram for Post -Development Prepared by {enter your company name here} 3/1312007 HydroCAD® 8.00 sin 004372 0) 2006 HydroCAD Software Solutions LLC Post -Development Prepared by {enter your company name here} HydroCADQ 8.00 sin 004372 © 2006 HydroCAD Software Solutions LLC Page 2 3/13/2007 Area Listing (selected nodes) Area (acres) CN Description (subcats) 19.860 56 Brush, Fair, HSG B (51S,81S) 5.510 58 Meadow, non -grazed, HSG B (81S) 0.550 61 >75% Grass cover, Good, HSG B (51S) 24.340 69 Pasture/grassland/range, Fair, HSG B (51S,81S) 4.110 98 Paved parking & roofs (51S) 54.370 Post -Development Type II 24 -hr 100 Year Rainfall=2.70" Prepared by {enter your company name here} Page 3 HydroCAD® 8.00 sin 004372 UC 2006 HydroCAD Software Solutions LLC 3/13/2007 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 51S: Area P-2 Subcatchment 81S: P -2 -Bypass Pond 51P: Pond -P-2 Runoff Area=38.400 ac Runoff Depth>0.41" Flow Length=2,155' Tc=13.1 min CN=66 Runoff=15.88 cfs 1.301 af Runoff Area=15.970 ac Runoff Depth>0.31 ° Flow Length=514' Tc=18.7 min CN=63 Runoff=3.36 cfs 0.415 af Peak Elev=6,914.11' Storage=0.189 af Inflow=15.88 cfs 1.301 af 30.0" x 34,0' Culvert Outflow=7.51 cfs 1.289 af Link 53L: P-2 Outfall Inflow=10.61 cfs 1.704 af Primary=10.61 cfs 1.704 af Total Runoff Area = 54.370 ac Runoff Volume = 1.715 af Average Runoff Depth = 0.38" 92.44% Pervious Area = 50.260 ac 7.56% Impervious Area = 4.110 ac Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by {enter your company name here} Page 4 HydroCAD® 8.00 sin 004372 © 2006 HydroCAD Software Solutions LLC 3/1312007 Subcatchment 51S: Area P-2 Runoff = 15.88 cfs 12.08 hrs, Volume= 1.301 af, Depths 0.41" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 17.220 56 Brush, Fair, HSG B 16.520 69 Pasture/grassland/range, Fair, HSG B 0.550 61 >75% Grass cover, Good, HSG B 4.110 98 Paved .arkin. & roofs 38.400 34.290 4.110 66 Weighted Average Pervious Area Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ftift) (ft/sec) (cfs) 8.3 100 0.0924 0.20 Sheet Flow, Grass: Short n= 0.150 P2= 1.30" 1.1 293 0.0817 4.60 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.9 793 0.0632 15.16 272.88 Channel Flow, Area= 18.0 sf Perim= 13.4' r= 1.34' n= 0.030 Earth, grassed & winding 2.8 969 0.1241 5.67 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 13.1 2,155 Total Post -Development Type 1124 -hr 100 Year Rainfal1=2.70" Prepared by {enter your company name here} Page 5 HydroCAD® 8.00 sin 004372 tJ 2006 HydroCAD Software Solutions LLC 3/13/2007 Subcatchment 51S: Area P-2 Hydrograph 17 161 15= 14= 13= 12 11= Tn. 1©- V p 87 0 6 5- 4= 3: 2= 1 0 15.88 cfs Type I124 -hr 100 Year Rainfall=2.70" Runoff Area=38.400 ac Runoff Volume=1.301 of Runoff Depth>0.41" Flow Length=2,155' Tc=13.1 min CN=66 0 3 4 10 11 2 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) — Runoff Post -Development Type 024-hrY00Year ��fall=2.70" Prepared by (enter your company name here} Page 6 HydroCAD® 8.00 s/n 004372 © 2006 HydroCAD Software Solutions LLC 3/13/2007 Hydrograph for Subcatchment 51S: Area P-2 Time Precip. Excess Runoff Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) pours) (inches) (inches) (cfs) 0.00 0.00 0.00 0,00 13.25 2.12 019 1.96 0.25 0.01 0,00 0.00 13.50 2.16 020 1.77 0.50 0.01 0.00 (lUO 13.75 2.19 0.21 1.58 0.75 0.02 0.00 0.00 14.00 2.21 0.22 1.43 1.00 0.03 0.00 0.00 14.25 2.24 0.23 1.31 1.25 0D4 0I0 0l0 14.50 2.26 0.24 1.26 1.50 0.04 0.00 0.00 14.75 2.28 0.25 1.21 1.75 0.06 0.00 0J00 15.00 2.30 0.25 1.16 2.00 0.06 0.00 0.00 15.25 2.32 0.28 1.11 2.25 0.07 0.00 0.00 15.50 2.34 0.27 1.06 2.50 0.08 0.00 0.00 15.75 2.36 0.27 1.00 2.75 0.08 0.00 0.00 18.00 2.38 0.28 0.94 3.00 0D0 0.00 0.00 16.25 2.39 0.28 0.89 3.25 0.10 8.00 0.00 16.50 2.41 0.29 0.87 3.50 0.11 0.00 0.00 16.75 2.42 0.30 0.85 3.75 0.12 0.00 0.00 17.00 2.43 0.30 0.84 4_00 0.13 0.00 0.00 17.25 2.45 0.31 0.82 4.25 0.14 0.00 0.00 17.50 2.46 0.31 0.80 4.50 0.15 0.00 0.00 1775 2.47 0.32 0.78 4.75 0.16 0.00 0.00 18.00 2.49 0.32 0.70 5.00 0.17 0.00 0.00 18.25 2.50 0.33 0.73 5.25 0.18 0.00 0.00 18.50 2.51 0.33 0.71 5.50 0.10 0.00 0.00 18.75 2.52 0.83 0.68 5.75 0.20 0.00 0.00 10.00 2.53 0.34 0.87 6.00 0.22 0.00 0.00 19,25 2.54 0.34 0.64 6.25 0.23 0.00 0.00 19.50 2.55 0.35 0.62 6.50 0.24 0.00 0.00 10.75 2,56 0.35 0.00 6.75 0.25 0.00 0.00 20.00 2.57 0.35 0.57 7.00 0.27 0.80 0.80 20.25 2.58 0.36 0.55 7.25 0.28 0.00 0.00 28.50 2.59 0.36 0.55 7.50 0.29 0.00 0.00 20.75 2.00 0.37 0.55 7.75 0.31 0.00 0.00 21.00 2.60 0.37 0.54 8.00 0.32 0.00 0.00 21.25 2.61 0.37 0.54 8.25 0.34 0.00 0.08 21.50 2.62 0.38 0.54 8.50 0.36 0.00 0.00 21.75 2.63 0.38 0.53 8.75 0.38 0.00 OOO 22.00 2.64 0.38 0.53 0.00 0.40 0.00 0.00 22.25 2.85 0.39 0.53 9.25 0.42 0.00 0.00 22.50 2.65 0.39 0.52 9.58 0.44 0.00 0.00 22.75 2.66 0.39 0.52 9.75 0.46 0.00 0.00 23.00 2.67 0.40 0.51 10.00 0.49 0.00 0.00 23.25 2.68 0.40 0.51 10,25 0,52 0,00 0.00 23.50 2.68 0.40 0.51 10.50 0.55 0.00 0.00 23.75 2.69 0.41 0.50 10.75 0.50 0.00 0.00 34.08 2.70 0.41 0.50 11.00 0.63 8.00 0.00 11.25 0.80 0,00 0.00 11.50 0.78 0.00 0.00 11.75 1.04 0,00 0.00 12.00 1.79 0.10 10.5$ 12.25 1.91 0.13 7.61 12.50 1.98 0.15 3.95 12.75 2.04 0.17 2.67 13.00 2.08 0.18 2.26 Post -Development Type 1124 -hr 100 Year Rainfall=2.70" Prepared by {enter your company name here} Page 7 HydroCAD® 8,00 s/n 004372 © 2006 HydroCAD Software Solutions LLC 3/13/2007 Subcatchment 81S: P -2 -Bypass Runoff = 3.36 cfs @ 12.17 hrs, Volume= 0.415 af, Depths 0.31" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type 11 24 -hr 100 Year Rainfall=2.70" Area (ac) CN Description 2.640 56 Brush, Fair, HSG B 7.820 69 Pasture/grassland/range, Fair, HSG B 5.510 58 Meadow, non -grazed HSG B 15.970 63 Weighted Average 15.970 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ft/sec) (cfs) 15.3 100 0.0204 0.11 Sheet Flow, Grass: Short n= 0.150 P2= 1.30" 3.4 414 0.0162 2.05 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 18.7 514 Total "0- 0 U 0 0 Subcatchment 81S: P -2 -Bypass Hydrograph 136 cfs] Type 11 24 -hr 100 Year Rainfall=2.70" Runoff Area=15.970 ac Runoff Volume -0.415 af Runoff Depth>0.31" Flow Length=514' Tc=18.7 min CN 63 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) -- Runoff Post -Development Type 8 24 -hr 100 Year Rain#all=2.70" Prepared by {enter your companame here} Page 8 MydnaCAD®8.O0 sin 0U43720D20UGHydnuCADSoftware Solutions LLC 3/13/2007 h for Subcatchment 81S: P -2 -Bypass Time Peoip. Excess Runoff Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs) 0.00 0.00 0l0 0l0 13.25 2.12 0.13 0i89 0.25 0.01 0.00 0.00 13.50 2.16 0.14 0.62 0.50 0.01 0.00 0.00 13.75 2.19 0.15 0.56 0.75 0.02 0.00 0.00 14.00 2.21 0.16 0.51 1.00 0.03 0.00 0.00 14.25 2.24 0.18 0.48 1.25 0.04 0.00 0.00 14.50 2.26 0.17 0.44 1.50 0.04 0.00 0.00 14.75 2.28 0.18 0.42 1.75 0.05 0.00 0.00 15.00 2.30 0.18 0.41 2.00 0.08 0.00 0.08 15.25 2.32 0_10 0.39 2.25 0.07 0.00 0.00 15.50 2.34 8.19 0.37 2.50 0.08 0.80 0.00 15.75 2.36 0.20 0.35 2.75 0.08 0.00 0.00 18.00 2.38 0.20 0.33 3.00 0.09 0.00 0.00 16.25 2.39 0.21 0.32 3.25 0.10 0.00 0.00 18.50 2.41 0,21 0.31 3.50 0.11 0.00 0.00 16.75 2.42 0.22 0.30 3.75 0.12 0.00 0.00 17.00 2.43 0.22 0.28 4.00 0.13 0.00 0.00 17.25 2.45 023 0.28 4.25 0.14 0.00 D.OD 17.50 2.46 0.23 0.28 4.50 0.16 0.00 0.00 17.75 2.47 0.24 0.27 4.75 0.16 0.00 0.00 18.00 2.49 0.24 0.27 5.00 0.17 0.00 0.00 18.25 2.50 0.24 0.26 5.25 0.18 0.00 0.00 18.50 2.51 0.25 0.25 5.50 0.18 0.00 0.08 18.75 2.52 0.25 0.25 5.75 0.20 0.00 0.00 19.00 2.53 025 0.24 8.00 0.22 0.00 0D0 19.25 2.54 0.20 0.23 6.25 0.23 0.00 0.00 19.50 2,55 0.28 0.22 6.50 0.24 0.00 0.00 19.75 2.56 0.26 0.21 6.75 0.25 0.00 0.00 20.00 2.57 0.27 0.21 7.00 0.27 0.00 0.00 20.25 2.58 0.27 0.20 7.25 0.28 0.00 0.00 20.50 2.59 0.27 020 7.50 0.29 0.00 0.00 20.75 2.60 0.28 0.18 7.75 8,31 0.00 0.00 21 OO 2.60 0.38 0.19 8.00 0.82 0.00 080 21 25 2.61 0.28 0.19 8.25 0.34 0.00 0.00 21.50 2.62 0.20 0.18 8.50 0.36 0.00 0.00 21.75 2.63 0.29 0.19 8.75 0.38 0.00 0.00 22.00 2.64 0.29 0.19 9.08 0.40 0.00 0.00 22.25 2.65 0.28 0.19 9.25 0.42 0.00 0.00 22.50 2.65 0.30 0.19 9.50 0.44 0.00 0.00 22.75 2.66 0.30 0.19 9.75 0.46 0.00 0.00 23.00 2.67 0.30 0.18 10.00 0.49 0.00 0.00 23.25 2.68 0.31 0.18 10.25 0.52 0.00 0.00 23.50 2.68 0.31 0.18 10.50 0.55 0.00 0.00 23.75 2.69 0.31 0.18 10.75 0.50 0.00 0.00 24.00 2.70 0.31 0.18 11.00 0.83 0.00 0.00 11.25 0.80 0.00 8.00 11.50 0.76 0.00 0.00 11.75 1.04 0.00 0.00 12.00 1.79 0.08 0.89 12.25 1.91 0.08 2.92 12.50 1.98 0.10 1.53 12J5 8.04 0.11 1.01 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by {enter your company name here} Page 9 HydroCAD® 8.00 sin 004372 © 2006 HydroCAD Software Solutions LLC 3113/2007 Pond 51P: Pond -P-2 Inflow Area = 38.400 ac, Inflow Depth > 0.41" for 100 Year event Inflow = 15.88 cfs @ 12.08 hrs, Volume= 1.301 af Outflow = 7.51 cfs @ 12.26 hrs, Volume= 1.289 af, Atten= 53%, Lag= 10.6 min Primary = 7.51 cfs @ 12.26 hrs, Volume= 1.289 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 6,914.11' @ 12.26 hrs Surf.Area= 0.327 ac Storage= 0.189 af Plug -Flow detention time= 17.0 min calculated for 1.289 af (99%© of inflow) Center -of -Mass det. time= 12.4 min ( 923.3 - 910.9 ) Volume Invert Avail.Storage Storage Description #1 6,913.00' 1.021 af Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre-feet) (acre-feet) 6,913.00 0.000 0.000 0.000 6,914.00 0.311 0.156 0.156 6,915.00 0.459 0.385 0.541 6,916.00 0.502 0.481 1.021 Device Routing Invert Outlet Devices #1 Primary 6,913.00' 30.0" x 34.0' long Culvert CMP, square edge headwall, Ke= 0.500 Outlet Invert= 6,911.00' S= 0.0588 '1' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior Primary OutFlow Max=7.48 cfs @ 12.26 hrs HW=6,914.10' (Free Discharge) L1=Culvert (Inlet Controls 7.48 cfs tr 3.58 fps) Post -Development Type 11 24 -hr 100 Year Rainfa11=2.70" Prepared by (enter your company name here) Page 10 HydroCAD® 8.00 sin 004372 © 2006 HydroCAD Software Solutions LLC 3/13/2007 Pond 51P: Pond -P-2 Hydrograph 17 16 15 14 13- 127 11] w 10, �9 7 5 3 0• Elevation (feet) 115 8 cfs Inflow Area=38.400 ac Peak Elegy=6,914,11' Storage=0.189 of 30.0" x 34.0' Culvert i 7.51 cis 2 3 4 5 6 ,. ..,.,r -r-- ......... ... .. ......_,.,... ,., ,,,..,-----ice 9 10 11 12 13. 14 15 16 17 18 19, 20 21 22 23 24 Time (hours) Pond 51P: Pond -P-2 Stage -Discharge 10 12 14 16 18 Discharge (cls) 20 22 24 26 28 30 — Inflow — Primary — Primary Post -Development Prepared by {enter your company name here} HydroCAD® 8.00 sin 004372 © 2006 HydroCAD Software Solutions LLC Type 1124 -hr 100 Year Rainfall=2.70" Page 11 3/13/2007 w Pond 51P: Pond -P-2 Stage -Area -Storage SurtacclHorizoritaifwetted Area (acres) 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0 Storage {acre-feet) — Surface ` — Storage 1 Post -Development Type 824-hr/00Year Ra/n/all=2.70" Prepared by {enter your company name here} Page 12 HydroCADO 8.00 sin 004372 0 2006 HydroCAD Software Solutions LLC 3/13/2007 Hydrograph for Pond 51P^: Pond -P-2 Time Inflow Storage Elevation Primary 22um) (cfs) (acre-feet) (feet) (cfs) 0.00 0.00 0.008 6.913.00 0.00 0.50 0l0 0.000 6,913.00 0l0 1.00 0.00 0.000 8.913.00 0.00 1.50 0.00 0.000 8.913.00 0.00 2.00 0.00 0.000 6.813D0 0.00 2.50 0.00 0.080 6,913.00 0.00 3.00 0.00 0.000 8^913D0 0.00 3.50 0.00 8.000 8.913.00 0.00 4.00 0.00 0.000 6.913.00 0.00 4.50 0.00 0.000 6.913.00 0.00 5.00 0.00 0.000 8.913.00 0.00 5.50 0.00 8D00 6.813D0 0.00 8.00 0.00 0.000 8.813.00 0.00 8.50 0.00 0.000 6^913.00 0.00 7.00 0.00 0.000 6.913D0 0.00 7.50 0.00 0D00 8.913.00 0.00 8.00 0.00 0,080 6,913.00 0.00 8.50 0.00 0.000 8.013.00 0.00 9.00 0.00 0.000 8.013D0 0.00 8.50 0.00 8.000 6,913 00 0.00 10.00 0.00 8.000 0.913.00 0.00 10.50 0.00 0.000 8.913.00 0.00 11D0 0.80 0.800 8.813.00 0.00 11.50 0.00 0.000 8.913.00 0.00 12.00 10.50 0.043 6.913.53 1.85 12.50 3.95 0.155 6,914.00 6.21 13.00 2.26 0.080 6.913.72 3.37 13.50 1.77 0.051 6,913.57 2.19 14.80 1.43 8.038 8.913.50 1.68 14.50 1.26 0.031 6,913.45 1.37 15.00 1.16 0i028 6,913.42 1.23 15.50 1.06 0.025 6.813.40 1.12 16.00 0.94 0.023 6,913.38 1.01 16.50 0.87 0.031 6,913.36 0.91 17.00 0.84 0.019 6,913.35 0.88 17.50 0.88 0.019 8.913.34 0.82 18.00 076 0.018 6,913.34 0.78 18.50 0.71 0.017 6.913.33 0.74 18.00 0.07 0.016 8.913.32 0.69 19.50 0.62 0.015 6,913.31 0.65 20.00 0.57 0.013 6,913.29 0.60 20.50 0.55 0.013 6,913.28 0.68 21.00 0.54 0.012 6,913.28 0.55 21.50 0.54 0D12 8.813.28 0.54 22.80 0.53 0.012 6.913.28 0.53 22.50 0.52 0.012 6,913.28 0.53 23.00 0.51 0.812 6.913.27 0.52 23.50 0.01 0.011 6,913.27 0.51 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared by {enter your company name here} Page 13 HydroCAD® 8.00 sin 004372 © 2006 HydroCAD Software Solutions LLC 3/13/2007 Elevation Primary __feet) (cfs) 6,913.00 0.00 6,913.02 0.00 6,913,04 0.01 6,913.06 0.03 6,913.08 0.05 6,913.10 0.07 6,913.12 0.10 6,913.14 0.14 6,913.16 0.18 6,913.18 0.23 6,913.20 0.28 6,913.22 0.34 6,913.24 0.40 6,913.26 0.47 6,913.28 0.54 6,913.30 0.62 6,913.32 0.71 6,913.34 0,80 6,913.36 0.89 6,913.38 0.99 6,913.40 1.09 6,913.42 1.20 6,913.44 1.31 6,913.46 1.43 6,913.48 1.55 6,913.50 1.68 6,913.52 1,81 6,913.54 1.95 6,913.56 2.09 6,913.58 2.24 6,913.60 2.39 6,913.62 2.54 6,913.64 2.70 6,913.66 2.87 6,913.68 3.03 6,913.70 3.21 6,913.72 3.38 6,913.74 3.56 6,913.76 3.74 6,913.78 3.93 6,913.80 4.12 6,913.82 4.32 6,913.84 4.52 6,913.86 4.72 6,913.88 4.93 6,913.90 5.14 6,913.92 5.35 6,913.94 5.57 6,913.96 5.79 6,913.98 6.02 6,914.00 6.24 6,914.02 6.47 6,914.04 6.71 Stage -Discharge for Pond 51 P: Pond -P-2 Elevation Primary Elevation Primary (feet) (cfs) (feet) (cfs). 6,914.06 6.94 6,915.12 22.00 6,914.08 7.19 6,915.14 22.28 6,914.10 7.43 6,915.16 22.56 6,914.12 7.67 6,915.18 22.83 6,914.14 7.92 6,915.20 23.10 6,914.16 8.18 6,915.22 23.37 6,914.18 8.43 6,915.24 23.63 6,914.20 8.69 6,915.26 23.89 6,914.22 8.95 6,915.28 24.15 6,914.24 9.21 6,915.30 24.40 6,914.26 9.48 6,915.32 24.64 6,914.28 9.74 6,915.34 24.88 6,914.30 10.01 6,915.36 25.11 6,914.32 10.28 6,915.38 25.33 6,914.34 10.56 6,915.40 25.54 6,914.36 10.84 6,915.42 25.75 6,914.38 11.11 6,915.44 25.94 6,914.40 11.39 6,915.46 26.12 6,914.42 11.68 6,915.48 26.29 6,914.44 11.96 6,915.50 26.43 6,914.46 12.25 6,915.52 26.64 6,914.48 12.53 6,915.54 26.84 6,914.50 12.82 6,915.56 27.05 6,914.52 13.11 6,915.58 27.26 6,914.54 13.41 6,915.60 27.46 6,914.56 13.70 6,915.62 27.66 6,914.58 13.99 6,915.64 27.87 6,914.60 14.29 6,915.66 28.07 6,914,62 14.59 6,915.68 28.26 6,914.64 14.88 6,915.70 28.46 6,914.66 15,18 6,915.72 28.66 6,914.68 15.48 6,915.74 28.85 6,914.70 15.78 6,915.76 29.04 6,914.72 16.08 6,915.78 29.24 6,914.74 16.38 6,915.80 29.43 6,914.76 16.68 6,915.82 29.62 6,914.78 16.98 6,915.84 29.80 6,914.80 17.28 6,915.86 29.99 6,914.82 17.58 6,915.88 30.18 6,914.84 17.89 6,915.90 30.36 6,914.86 18.19 6,915.92 30.54 6,914.88 18.49 6,915.94 30.73 6,914.90 18.79 6,915.96 30.91 6,914.92 19.08 6,915.98 31.09 6,914.94 19.38 6,916.00 31.27 6,914.96 19.68 6,914.98 19.98 6,915.00 20.27 6,915.02 20.56 6,915,04 20.86 6,915.06 21,14 6,915.08 21.43 6,915.10 21.72 Post -Development Type 11 24 -hr 100 Year Rainfall=2.70" Prepared b{enter your company Page 14 HydroCADO 8.00 sin 004372 © 2006 HydroCAD Software Solutions LLC 3/13/2007 Stage -Area -Storage for Pond 51P: Pond -P-2 Elevation Surface Storage (feet) (acres) (acre-feet) 6,918.00 0.000 0.000 8^913.05 0.018 0.000 6.913.10 0.031 0,002 8.913.15 0.847 0.003 6.013.20 0.062 8.008 6.013.25 0.078 0.010 6.913.30 0.093 0.014 6.913.35 0.109 0.010 8.913.40 0.124 0.825 6,913.45 0.140 0.831 8.913.50 0.156 0.038 8.013.55 0.171 0.047 8.913.80 0.187 0.058 8.913.65 0.202 0.066 8.913.70 0.218 0.070 8.913.75 0.233 0.087 6,913.80 0.249 0.100 6`913.86 0.284 0.112 8'913.90 0.280 0.126 8.913.05 0.295 0.140 0.914.00 0.311 0.156 6,914.05 0.318 0.171 8.91410 0.326 0.187 6.91415 0.333 0.204 8.91420 0.341 0.221 6,914.25 0.348 0.238 6,914.30 0.355 0.255 6,914.35 0.363 0.273 6.914,40 0.370 0.292 6,914.45 0.378 0.310 8'914.58 0.385 0.330 8.914.55 0.392 0.349 6.014.80 0400 0.369 6,914.65 0407 0.389 8.81470 0.415 0.408 6.914.75 0.422 0.430 8.914.80 0.429 0.452 6,914.85 0.437 0.473 0,914,90 0.444 0.495 8'914.96 0.452 0.518 8'915,00 0,459 0.541 8^915.05 0.461 0.564 8,915`10 0.463 0.587 8.915]5 0.465 0.810 6^91520 0.468 0.633 6.315.25 0470 0.857 8.915.30 0.472 0.080 6,915.35 0.474 0.704 6,915.40 0.476 0.728 6,915.45 0,47 0.751 8.915.50 0.481 0J75 6'815.55 0.483 0.799 8.915.00 0.485 0.824 Elevation Surface Storage (feet) (acres) (acre-feet) 8.915.85 0.487 0,848 6.915.70 0.489 0.872 0.915.75 0.491 0.897 8.915.80 0.493 0.921 6,915.85 0.49 0.946 6'915.00 0.498 0.971 8.915.85 0.500 0.996 8,818.00 0.502 1.021 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Post -Development Prepared by {enter your company name here} H droCAD® 8.00 s/n 004372 © 2006 H droCAD Software Solutions LLC Link 53L: P-2 Outfall 54.370 ac, Inflow depth > 0.38" for 100 Year event 10.61 cfs @ 12.22 hrs, Volume= 10.61 cfs 1.704 af @ 12.22 hrs, Volume= 1.704 af, Atten= 0%, Lag= 0.0 min = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 53L: P-2 Outfall Type 1124 -hr 100 Inflow Area Inflow Primary = Primary outflow 0 L Hydrograpil 9 10 11 12 13 14 15 16 17 18 ig 20 21 22 23 24 Time (hours) * Q., z..„, # A.) low _ '.-- oi."a= 6*c� /m= In^- ^ 2,17 0.00 0.00 1*u0 2.17 1.94OUO O�OO 14.25 1.94 0.00 1.80 1^' D'0O 0.00 14.50 1.8O u.uu 1. 71 125 ' 1.71 0.00 15O 000 14.750.00� OOO 1.63 � `Ou O'0} 0.00 19.0O �m» 0.00 1.56 1.75 »�0.00'OOO 15.25 1.56 0QO 14Q 2.00 0.00� 15.50 1.49 � � 2.25 000 0'00 0.001575 1.42 0.00 1.42 2.50 0.00 O'U0 0.00180O 1.34 �0 1.34 2.75 0.30 0.00 0.00 16.25 127 0.00 1.27 3.00 0.00 0.00 0.00 1850 1.22 0.00 1.22 3.25 0.00 Q�OD 0.00 16.75 1.15 0.80 1.1835U OU0 0.00 0.00 17.00 1'16 0.00 1.15 3.75 0.00 0.00 0.00 1'13 0.00 1.1340O 000 0.00 0.00 17.25 110 0.00 1.10 4.25 0.00 0.00 0.00 17.5017.75 1.07' 0.00 1.07 4.50 0.00 0,00 0.80 18.00 1.05 0.00 1.05 4.75 0.00 0.00 0.00 1825 � 500 000 0.00 0.00 18.50'02 0.08 1.02 0.99 0.00 0.99 52g U�O0 O�00 0.00 18 75 0.96 0.00 0.88 5.50' 0.00 0.00 8.00 1980 083 0.00 0.93 5.75 0.00 0.00 0.001Q25 D9O 0.00 0.9000O' 0.00 0.00 0.00 19.50'0.87'0�08 0.87 6.25 000 0.00 0'00 1B75 O 050 000 0.00 0.00 84 0.00 0.842U&O 0.81 0.00 0'81 6.75 0.00 0.00 0.00 20.25 0.78 0.08 0'78 7DO 0.00 0.00 D'U0 7.25 0.00 0.00 0'00 20'50 076 0.00 0.76 7.50 0.00 0.00 0.00 20.75 0.75 0.00 0.75 0.74 7.75 0.00 0.00 8.00 21.00 0.74874 0.000.00 0.74 8.00 8'DO 0�UD 0.00 21.25 0'73 0.00 0.73 825 O0O O�0O 0.00 21.50 073 0.00 0.7388U O'DD 0.00 0.00 21.75 O'72 0.00 0.72 8.75 0.00 0.00 0.00 22.000'7% 0.00 0.72 9.00 0.00 0.00 0.00 22.25 0.71 0.00 0.7122.75&2G 000 0.00 0.00 22.50 0'71 0.00 0.71 9.50 000 0.80 0.00 22� 0.70 0.00 0.70yTg 0.00 0.00 0.30 23.00 0.70 000 0.70 1000 0.00 0.00 0.00 23.25 0.69 080 0.89 10.25 0.00 0.00 0.00 23.50 0.69 0.00 0.69 1U5O 0.00 0.00 0'00 23.75O88 000 0.68 �0.00 OQO 24.00� 10.75 0.00 _,, 11.00 0.00 0,00 0.00 11.25 0.00 0.00 O0311.50 0.00 0.00 0.00 11.75 O0O O' O 00 0.00 � - 0.00 2.74 12.00 2.74 0.00 10.42 12.25 10.42 774 0.00 7.74 12.50�5.55 12.750.00 ' - - 5G5 13.00 4.17 000 4.17 Tmna024-hrY0DYear Rainfall, ---2.70" 7� ', Page 16 3/13/2007 name here} H droCAD Software Solutions LLC Hydrograph for Link 53L: P-2 Outfall 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1