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1.15 Floodplain Analysis Maps and HEC-RAS Output
Floodplain Development Report for Middle Colorado Agriculture Collaborative Fish Passage Design in New Castle, Colorado 211-020.020 Wright Water Engineers, Inc. Attachments July 2024 D.2 Floodplain Analysis Maps and HEC-RAS Output APPROXIMATE ZONE AE FLOODWAY EXTENTS DIGITIZED BY WWE XS : 8 1 1 XS: 724 XS: 678 XS: 578 XS: 525 XS: 476 FL O W EL K C R E E K 5705 5710 5715 5720 5 6 9 0 5695 57 0 0 5 7 0 5 57 1 0 57 1 5 5 6 9 5 5 6 9 0 5 6 9 0 5 6 9 5 5 6 9 5 5 6 9 5 56 9 0 5 6 9 0 56 9 0 5695 5695 56 9 5 5 6 9 0 570 0 56 9 5 PROPOSED SECTION LOCATIONS EXISTING/PROPOSED INUNDATION BOUNDARY BOULDER (TYP.) STREAM SUBSTRATE (D50 = 18"), 3' THICK PROTECT EXISTING 48-INCH CONCRETE FLUME IN PLACE AND ADD FLOW MEASUREMENT TELEMETRY SHEET PILE DIVERSION DAM WITH CONCRETE CAP OVERFLOW CHANNEL ROCK VANE (TYP.) EXISTING DIVERSION DAM (UPSIDE DOWN BRIDGE DECK) STRUCTURE TO BE REMOVED PROPOSED STREAM THALWEG DAVIT CRANE PAD REVEGETATION: UPLAND SEED GRATE INSTALL RAILING VOID-FILLED RIPRAP (D50 = 18"), 3' THICK VOID-FILLED RIPRAP (D50 = 18"), 3' THICK PROPOSED MAINTENANCE ACCESS STREAM SUBSTRATE ALONG TOE OF BANK AT GRADE LEGEND: EFFECTIVE ZONE AE FLOODPLAIN (APPROXIMATELY DIGITIZED BY WWE) MODELED CROSS SECTIONS MODELED RIVER CENTERLINE EXISTING CONDITIONS 100-YEAR INUNDATION BOUNDARY PROPOSED CONDITIONS 100-YEAR INUNDATION BOUNDARY DRAFT WORK IN PROGRESS NORTH 20 40 FT200 PLAN ROSEMAN DIVERSION FLOODPLAIN WORKMAP 01 WRIGHT WATER ENGINEERS, INC. GLENWOOD SPRINGS, CO 81601 (970) 945-7755 FAX(970) 945-9210 818 COLORADO AVENUE, SUITE 307 NEW CASTLE, COLORADO SHEET NUMBER: WWE JOB NUMBER: 211-020.020 NOTES: 1.ROSEMAN DIVERSION IS LOCATED IN A ZONE AE SPECIAL FLOOD HAZARD AREA SUBJECT TO INUNDATION BY THE 1% ANNUAL CHANCE FLOOD AREA WHERE NO BASE FLOOD ELEVATIONS ARE DETERMINED. 2.THE SHAPEFILES FOR THIS ZONE AE FLOODPLAIN AREA ARE NOT AVAILABLE, THE FIRM WAS APPROXIMATELY GEOREFFERENCED USING SECTION LINES, AND THE ZONE AE FLOODWAY AREA WAS DIGITIZED BY WWE. 3.EFFECTIVE HYDROLOGY IS NOT PUBLISHED FOR THIS AREA, WWE DEVELOPED A 100-YEAR FLOW RATE OF 2,573 CFS. Work Proposed Station Effective Model 1D Existing Model 1D Proposed Model 1D Existing vs 1D Proposed 811 -5700.7 5700.7 0 724 -5699.05 5699.05 0 x 678 -5698.34 5698.32 -0.02 x 578 -5696.61 5696.6 -0.01 525 -5694.81 5694.81 0 476 -5694.26 5694.26 0 G:\WWE\211-020\020\Engr\Hydraulics\HEC-RAS 1D Model\ Roseman WSEL Comparison.xlsx Wright Water Engineers, Inc. 0 50 100 150 200 250 300 350 5686 5688 5690 5692 5694 5696 5698 5700 5702 MCAC 1D Floodplain Model Plan: 1) 1D_PC_20240620 6/24/2024 2) 1D_EC_20240620 6/24/2024 Main Channel Distance (ft) El e v a t i o n ( f t ) Legend EG 100-year - 1D_PC_20240620 EG 100-year - 1D_EC_20240620 Crit 100-year - 1D_PC_20240620 WS 100-year - 1D_EC_20240620 WS 100-year - 1D_PC_20240620 Crit 100-year - 1D_EC_20240620 Ground Ground Elk River RosemanDiversion 0 20 40 60 80 100 120 140 160 5690 5695 5700 5705 5710 5715 5720 5725 MCAC 1D Floodplain Model Plan: 1) 1D_PC_20240620 2) 1D_EC_20240620 Station (ft) El e v a t i o n ( f t ) Legend EG 100-year - 1D_EC_20240620 EG 100-year - 1D_PC_20240620 WS 100-year - 1D_PC_20240620 WS 100-year - 1D_EC_20240620 Crit 100-year - 1D_EC_20240620 Crit 100-year - 1D_PC_20240620 - 1D_EC_20240620 Ground - 1D_EC_20240620 Bank Sta - 1D_EC_20240620 - 1D_PC_20240620 Ground - 1D_PC_20240620 Bank Sta - 1D_PC_20240620 0 50 100 150 200 250 5690 5695 5700 5705 5710 5715 5720 MCAC 1D Floodplain Model Plan: 1) 1D_PC_20240620 2) 1D_EC_20240620 Station (ft) El e v a t i o n ( f t ) Legend EG 100-year - 1D_EC_20240620 EG 100-year - 1D_PC_20240620 Crit 100-year - 1D_EC_20240620 WS 100-year - 1D_PC_20240620 WS 100-year - 1D_EC_20240620 Crit 100-year - 1D_PC_20240620 - 1D_EC_20240620 Ground - 1D_EC_20240620 Bank Sta - 1D_EC_20240620 - 1D_PC_20240620 Ground - 1D_PC_20240620 Bank Sta - 1D_PC_20240620 0 50 100 150 200 250 300 5690 5695 5700 5705 5710 5715 5720 5725 MCAC 1D Floodplain Model Plan: 1) 1D_PC_20240620 2) 1D_EC_20240620 Station (ft) El e v a t i o n ( f t ) Legend EG 100-year - 1D_PC_20240620 EG 100-year - 1D_EC_20240620 Crit 100-year - 1D_EC_20240620 WS 100-year - 1D_EC_20240620 WS 100-year - 1D_PC_20240620 Crit 100-year - 1D_PC_20240620 - 1D_EC_20240620 Ground - 1D_EC_20240620 Bank Sta - 1D_EC_20240620 - 1D_PC_20240620 Ground - 1D_PC_20240620 Bank Sta - 1D_PC_20240620 0 50 100 150 200 250 300 5680 5690 5700 5710 5720 5730 5740 MCAC 1D Floodplain Model Plan: 1) 1D_PC_20240620 2) 1D_EC_20240620 Station (ft) El e v a t i o n ( f t ) Legend EG 100-year - 1D_PC_20240620 EG 100-year - 1D_EC_20240620 WS 100-year - 1D_EC_20240620 WS 100-year - 1D_PC_20240620 Crit 100-year - 1D_EC_20240620 Crit 100-year - 1D_PC_20240620 - 1D_EC_20240620 Ground - 1D_EC_20240620 Bank Sta - 1D_EC_20240620 - 1D_PC_20240620 Ground - 1D_PC_20240620 Bank Sta - 1D_PC_20240620 0 50 100 150 200 250 300 5680 5690 5700 5710 5720 5730 MCAC 1D Floodplain Model Plan: 1) 1D_PC_20240620 2) 1D_EC_20240620 Station (ft) El e v a t i o n ( f t ) Legend EG 100-year - 1D_EC_20240620 EG 100-year - 1D_PC_20240620 Crit 100-year - 1D_EC_20240620 WS 100-year - 1D_PC_20240620 WS 100-year - 1D_EC_20240620 Crit 100-year - 1D_PC_20240620 - 1D_EC_20240620 Ground - 1D_EC_20240620 Bank Sta - 1D_EC_20240620 - 1D_PC_20240620 Ground - 1D_PC_20240620 Bank Sta - 1D_PC_20240620 0 50 100 150 200 250 300 5685 5690 5695 5700 5705 5710 5715 5720 MCAC 1D Floodplain Model Plan: 1) 1D_PC_20240620 2) 1D_EC_20240620 Station (ft) El e v a t i o n ( f t ) Legend EG 100-year - 1D_EC_20240620 EG 100-year - 1D_PC_20240620 Crit 100-year - 1D_EC_20240620 WS 100-year - 1D_PC_20240620 WS 100-year - 1D_EC_20240620 Crit 100-year - 1D_PC_20240620 - 1D_EC_20240620 Ground - 1D_EC_20240620 Bank Sta - 1D_EC_20240620 - 1D_PC_20240620 Ground - 1D_PC_20240620 Bank Sta - 1D_PC_20240620 HEC-RAS River: Elk River Reach: RosemanDiversion Profile: 100-year Reach River Sta Profile Plan Q Total Min Ch El W.S. Elev Crit W.S. E.G. Elev E.G. Slope Vel Chnl Flow Area Top Width Froude # Chl (cfs) (ft) (ft) (ft) (ft) (ft/ft) (ft/s) (sq ft) (ft) RosemanDiversion 811 100-year 1D_PC_20240620 2573.00 5694.56 5700.70 5700.04 5701.74 0.007701 10.10 331.47 104.53 0.75 RosemanDiversion 811 100-year 1D_EC_20240620 2573.00 5694.56 5700.70 5700.04 5701.74 0.007701 10.10 331.47 104.53 0.75 RosemanDiversion 724 100-year 1D_PC_20240620 2573.00 5693.42 5699.05 5699.05 5700.96 0.009711 12.34 242.46 64.00 0.96 RosemanDiversion 724 100-year 1D_EC_20240620 2573.00 5693.42 5699.05 5699.05 5700.96 0.009711 12.34 242.46 64.00 0.96 RosemanDiversion 678 100-year 1D_PC_20240620 2573.00 5694.66 5698.32 5698.32 5699.82 0.008549 11.03 273.90 99.19 1.09 RosemanDiversion 678 100-year 1D_EC_20240620 2573.00 5691.44 5698.34 5698.34 5699.69 0.008199 14.09 294.77 97.84 0.98 RosemanDiversion 578 100-year 1D_PC_20240620 2573.00 5688.16 5696.60 5694.76 5697.27 0.002520 7.37 482.49 123.86 0.51 RosemanDiversion 578 100-year 1D_EC_20240620 2573.00 5689.29 5696.61 5694.76 5697.26 0.002458 7.05 474.88 123.94 0.50 RosemanDiversion 525 100-year 1D_PC_20240620 2573.00 5687.53 5694.81 5694.81 5696.90 0.008151 13.18 292.84 72.85 0.90 RosemanDiversion 525 100-year 1D_EC_20240620 2573.00 5687.53 5694.81 5694.81 5696.90 0.008151 13.18 292.84 72.85 0.90 RosemanDiversion 476 100-year 1D_PC_20240620 2573.00 5686.94 5694.26 5694.26 5696.39 0.007749 12.73 287.80 74.54 0.87 RosemanDiversion 476 100-year 1D_EC_20240620 2573.00 5686.94 5694.26 5694.26 5696.39 0.007749 12.73 287.80 74.54 0.87