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HomeMy WebLinkAbout025 Appendix Q - Flood Hazard MemoINTRODUCTION This report provides an analysis of the flood hazard for the proposed West Park Subdivision. The 40-acre development has one waterway, Baxter Creek, that runs south to north through the property. Baxter Creek runs through the eastern portion of the property and is classified as stream/ditch because it is fed by natural drainage and irrigation. Wetland plants surround the creek which meanders through cultivated pasture. METHOD Morrison-Maierle surveyed the 40-acre property, including the water ways with GPS survey equipment. Cross sections were developed approximately every 100 ft along each water way in AutoCAD. Bentley Flowmaster V10.02 was used to analyze each cross section to determine the water surface elevation for the given flow rate. The water surface elevation was then mapped in AutoCAD to show the extents of flooding in the current condition and areas that will require grading to contain flood waters. BAXTER CREEK Baxter Creek flows through the easterly portion of the proposed subdivision. There is not a defined floodplain associated with Baxter Creek as it has not been mapped as part of the FEMA process. The Baxter Creek corridor will be located in a proposed park as part of the subdivision. As part of the original Norton East Ranch Annexation and Phase 1 of Norton East Ranch Subdivision, the owner of the property at that time placed a covenant on the Baxter Creek corridor which limits almost all activity within the corridor and as such the floodplain impacts on the developable land within the proposed subdivision will be limited. Numerous engineering reports have been completed for Baxter Creek as part of the numerous development projects that exist above and below this project. The Valley West Subdivision identified the 100-year, 24 hour peak flow rate at Durston Road to be 114 cubic feet per second, that analysis reviewed upstream flow paths and looked at limiting restrictions, such as road crossing culverts. This value is documented in the Drainage Plan for the Valley West Subdivision. As part of Phase 1 of the Norton East Ranch Subdivision, Sanderson Stewart prepared a flood hazard evaluation of Baxter Creek which utilized a different approach in estimating the 100- year, 24 hour peak flow event. The methodology utilized the SCS method to determine the flow based on the area of the drainage basin. Based on that, the 100-year flow at Babcock was estimated to be 223 cubic feet per second. In the same report Sanderson Stewart describe the determination of n-values used to estimate channel flow rates. The value of 0.0045 used by Sanderson Stewart is also appropriate for the Baxter Creek reach flowing through the West Park subdivision, which is a winding natural channel with pools and shoals. The attached Exhibit C shows the limits of the 100-year flood hazard area. Cross section data is also attached. N89°31'09"E 1275.68'S1°13'56"W 1295.69'0+001+002+003 + 0 0 4 + 0 0 5+00 6+ 0 0 7+008+009+0010+0010+004781.0 4780.0 4781.0 4780.0 4779.0 4779.0 4781.0 4782.0 4785 4782 4783 4784 4786 478747 8 8 4780 478 5 4781 4 7 8 2 47 8 3 4784 4785 4784 47864787 478847894791 4792 4793 4794 4790. 0 4785 479047844786 4 7 8 7 478847894790.00 4787.17 4783.04784.04784.0 4785.0 LEGEND EXISTING MAJOR CONTOUR EXISTING MINOR CONTOUR PROPOSED MAJOR CONTOUR PROPOSED MINOR CONTOUR 100 YEAR FLOOD HAZARD LIMITS VERIFY SCALE! THESE PRINTS MAY BE REDUCED. LINE BELOW MEASURES ONE INCH ON ORIGINAL DRAWING. MODIFY SCALE ACCORDINGLY! 2022COPYRIGHT © MORRISON-MAIERLE, SHEET NUMBER PROJECT NUMBER DRAWING NUMBER DATEDESCRIPTIONNO.BY N:\10130\001.01 PREPLAT\ACAD\EXHIBITS\FLOOD HAZARD.DWGREVISIONS DRAWN BY: DSGN. BY: APPR. BY: DATE: Q.C. REVIEW DATE: BY: 2880 Technology Blvd West Bozeman, MT 59718 406.587.0721 www.m-m.net engineers surveyors planners scientists MorrisonMaierle PLOTTED BY:BEN BERRY ON Apr/29/2022 WEST PARK SUBDIVISION BOZEMAN MONTANA BAXTER CREEK FLOOD HAZARD MAP N10130.001 EX C BTB BTB JRN 30 6015300 SCALE IN FEET   VAUGH N D R I V E PROPOSED GRAVEL TRAIL WEST PARK SUBDIVISION SITE B BAXTER CREEK 3+00 Flood Elevation Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope cfs223.00Discharge Section Definitions Elevation(ft)Station(ft) 4,788.10-0+62 4,787.00-0+30 4,785.500+00 4,786.390+21 4,787.990+42 4,787.390+56 Roughness Segment Definitions Roughness CoefficientEnding StationStart Station 0.045(0+56, 4,787.39)(-0+62, 4,788.10) Options Pavlovskii's MethodCurrent Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Results in14.5Normal Depth 4,785.5 to 4,788.1 ftElevation Range ft²31.3Flow Area ft49.4Wetted Perimeter in7.6Hydraulic Radius ft49.32Top Width in14.5Normal Depth in17.5Critical Depth ft/ft0.032Critical Slope ft/s7.12Velocity ft0.79Velocity Head ft2.00Specific Energy 1.576Froude Number SupercriticalFlow Type Page 1 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 3+00 Flood Elevation GVF Input Data in0.0Downstream Depth ft0.0Length 0Number Of Steps GVF Output Data in0.0Upstream Depth N/AProfile Description ft0.00Profile Headloss ft/sInfinityDownstream Velocity ft/sInfinityUpstream Velocity in14.5Normal Depth in17.5Critical Depth ft/ft0.085Channel Slope ft/ft0.032Critical Slope Page 2 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Baxter Creek Cross Section for 3+00 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope in14.5Normal Depth cfs223.00Discharge Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/26/2022 FlowMaster [10.02.00.01]Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Worksheet for 4+00 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope cfs223.00Discharge Section Definitions Elevation(ft)Station(ft) 4,788.53-0+95 4,786.13-0+30 4,784.670+00 4,785.630+14 4,785.200+27 4,787.670+43 Roughness Segment Definitions Roughness CoefficientEnding StationStart Station 0.045(0+43, 4,787.67)(-0+95, 4,788.53) Options Pavlovskii's MethodCurrent Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Results in14.6Normal Depth 4,784.7 to 4,788.5 ftElevation Range ft²33.0Flow Area ft56.3Wetted Perimeter in7.0Hydraulic Radius ft56.19Top Width in14.6Normal Depth in17.2Critical Depth ft/ft0.033Critical Slope ft/s6.76Velocity ft0.71Velocity Head ft1.92Specific Energy 1.554Froude Number SupercriticalFlow Type Page 1 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Worksheet for 4+00 GVF Input Data in0.0Downstream Depth ft0.0Length 0Number Of Steps GVF Output Data in0.0Upstream Depth N/AProfile Description ft0.00Profile Headloss ft/sInfinityDownstream Velocity ft/sInfinityUpstream Velocity in14.6Normal Depth in17.2Critical Depth ft/ft0.085Channel Slope ft/ft0.033Critical Slope Page 2 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Cross Section for 4+00 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope in14.6Normal Depth cfs223.00Discharge Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/29/2022 FlowMaster [10.02.00.01]Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Worksheet for 5+00 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope cfs223.00Discharge Section Definitions Elevation(ft)Station(ft) 4,786.87-0+85 4,785.90-0+61 4,785.11-0+42 4,783.110+00 4,784.600+13 4,784.690+26 4,784.700+42 4,784.800+54 4,786.340+65 4,786.440+79 Roughness Segment Definitions Roughness CoefficientEnding StationStart Station 0.045(0+79, 4,786.44)(-0+85, 4,786.87) Options Pavlovskii's MethodCurrent Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Results in16.8Normal Depth 4,783.1 to 4,786.9 ftElevation Range ft²29.4Flow Area ft42.0Wetted Perimeter in8.4Hydraulic Radius ft41.90Top Width in16.8Normal Depth in21.0Critical Depth ft/ft0.036Critical Slope ft/s7.59Velocity ft0.90Velocity Head Page 1 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Worksheet for 5+00 Results ft2.30Specific Energy 1.599Froude Number SupercriticalFlow Type GVF Input Data in0.0Downstream Depth ft0.0Length 0Number Of Steps GVF Output Data in0.0Upstream Depth N/AProfile Description ft0.00Profile Headloss ft/sInfinityDownstream Velocity ft/sInfinityUpstream Velocity in16.8Normal Depth in21.0Critical Depth ft/ft0.085Channel Slope ft/ft0.036Critical Slope Page 2 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Baxter Creek Cross Section for 5+00 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope in16.8Normal Depth cfs223.00Discharge Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/29/2022 FlowMaster [10.02.00.01]Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Worksheet for 6+00 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope cfs223.00Discharge Section Definitions Elevation(ft)Station(ft) 4,789.80-0+80 4,786.21-0+68 4,785.02-0+56 4,784.98-0+46 4,784.41-0+32 4,782.740+00 4,783.020+10 4,783.510+34 4,783.390+49 4,783.090+63 4,784.290+80 4,784.250+93 Roughness Segment Definitions Roughness CoefficientEnding StationStart Station 0.045(0+93, 4,784.25)(-0+80, 4,789.80) Options Pavlovskii's MethodCurrent Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Results in11.5Normal Depth 4,782.7 to 4,789.8 ftElevation Range ft²39.7Flow Area ft89.6Wetted Perimeter in5.3Hydraulic Radius ft89.53Top Width in11.5Normal Depth in13.2Critical Depth ft/ft0.036Critical Slope Page 1 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Worksheet for 6+00 Results ft/s5.61Velocity ft0.49Velocity Head ft1.45Specific Energy 1.484Froude Number SupercriticalFlow Type GVF Input Data in0.0Downstream Depth ft0.0Length 0Number Of Steps GVF Output Data in0.0Upstream Depth N/AProfile Description ft0.00Profile Headloss ft/sInfinityDownstream Velocity ft/sInfinityUpstream Velocity in11.5Normal Depth in13.2Critical Depth ft/ft0.085Channel Slope ft/ft0.036Critical Slope Page 2 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Baxter Creek Cross Section for 6+00 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope in11.5Normal Depth cfs223.00Discharge Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/29/2022 FlowMaster [10.02.00.01]Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Worksheet for 6+61 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope cfs223.00Discharge Section Definitions Elevation(ft)Station(ft) 4,787.34-0+45 4,784.10-0+35 4,785.73-0+29 4,783.15-0+06 4,782.200+00 4,783.250+16 4,783.500+46 4,783.460+60 4,782.970+88 4,783.471+00 4,783.991+05 4,784.301+12 Roughness Segment Definitions Roughness CoefficientEnding StationStart Station 0.045(1+12, 4,784.30)(-0+45, 4,787.34) Options Pavlovskii's MethodCurrent Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Results in16.7Normal Depth 4,782.2 to 4,787.3 ftElevation Range ft²43.4Flow Area ft111.3Wetted Perimeter in4.7Hydraulic Radius ft111.13Top Width in16.7Normal Depth in18.1Critical Depth ft/ft0.037Critical Slope Page 1 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Worksheet for 6+61 Results ft/s5.14Velocity ft0.41Velocity Head ft1.80Specific Energy 1.451Froude Number SupercriticalFlow Type GVF Input Data in0.0Downstream Depth ft0.0Length 0Number Of Steps GVF Output Data in0.0Upstream Depth N/AProfile Description ft0.00Profile Headloss ft/sInfinityDownstream Velocity ft/sInfinityUpstream Velocity in16.7Normal Depth in18.1Critical Depth ft/ft0.085Channel Slope ft/ft0.037Critical Slope Page 2 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Baxter Creek Cross Section for 6+61 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope in16.7Normal Depth cfs223.00Discharge Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/29/2022 FlowMaster [10.02.00.01]Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Worksheet for 7+00 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope cfs223.00Discharge Section Definitions Elevation(ft)Station(ft) 4,787.04-0+59 4,784.48-0+48 4,784.01-0+36 4,782.87-0+24 4,782.63-0+13 4,782.140+00 4,781.950+03 4,782.630+10 4,783.360+48 4,782.990+75 4,782.900+90 4,783.181+00 4,783.931+10 Roughness Segment Definitions Roughness CoefficientEnding StationStart Station 0.045(1+10, 4,783.93)(-0+59, 4,787.04) Options Pavlovskii's Method Current Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Results in15.1Normal Depth 4,782.0 to 4,787.0 ftElevation Range ft²43.1Flow Area ft109.6Wetted Perimeter in4.7Hydraulic Radius ft109.48Top Width in15.1Normal Depth in16.7Critical Depth Page 1 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Worksheet for 7+00 Results ft/ft0.038Critical Slope ft/s5.18Velocity ft0.42Velocity Head ft1.68Specific Energy 1.454Froude Number SupercriticalFlow Type GVF Input Data in0.0Downstream Depth ft0.0Length 0Number Of Steps GVF Output Data in0.0Upstream Depth N/AProfile Description ft0.00Profile Headloss ft/sInfinityDownstream Velocity ft/sInfinityUpstream Velocity in15.1Normal Depth in16.7Critical Depth ft/ft0.085Channel Slope ft/ft0.038Critical Slope Page 2 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Baxter Creek Cross Section for 7+00 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope in15.1Normal Depth cfs223.00Discharge Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/29/2022 FlowMaster [10.02.00.01]Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Worksheet for 7+60 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope cfs223.00Discharge Section Definitions Elevation(ft)Station(ft) 4,786.88-0+39 4,784.67-0+25 4,782.73-0+12 4,781.700+00 4,781.980+30 4,781.850+43 4,783.220+57 4,783.260+96 4,783.171+00 Roughness Segment Definitions Roughness CoefficientEnding StationStart Station 0.045(1+00, 4,783.17)(-0+39, 4,786.88) Options Pavlovskii's Method Current Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Results in9.7Normal Depth 4,781.7 to 4,786.9 ftElevation Range ft²33.6Flow Area ft58.9Wetted Perimeter in6.8Hydraulic Radius ft58.82Top Width in9.7Normal Depth in12.2Critical Depth ft/ft0.033Critical Slope ft/s6.64Velocity ft0.68Velocity Head ft1.49Specific Energy Page 1 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Worksheet for 7+60 Results 1.548Froude Number SupercriticalFlow Type GVF Input Data in0.0Downstream Depth ft0.0Length 0Number Of Steps GVF Output Data in0.0Upstream Depth N/AProfile Description ft0.00Profile Headloss ft/sInfinityDownstream Velocity ft/sInfinityUpstream Velocity in9.7Normal Depth in12.2Critical Depth ft/ft0.085Channel Slope ft/ft0.033Critical Slope Page 2 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Baxter Creek Cross Section for 7+60 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope in9.7Normal Depth cfs223.00Discharge Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/29/2022 FlowMaster [10.02.00.01]Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Worksheet for 8+00 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope cfs223.00Discharge Section Definitions Elevation(ft)Station(ft) 4,785.72-0+62 4,786.26-0+55 4,784.90-0+52 4,784.34-0+41 4,782.90-0+18 4,781.200+00 4,781.200+11 4,781.700+24 4,781.770+35 4,782.820+49 4,783.460+66 Roughness Segment Definitions Roughness CoefficientEnding StationStart Station 0.045(0+66, 4,783.46)(-0+62, 4,785.72) Options Pavlovskii's Method Current Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Results in11.9Normal Depth 4,781.2 to 4,786.3 ftElevation Range ft²31.8Flow Area ft51.4Wetted Perimeter in7.4Hydraulic Radius ft51.34Top Width in11.9Normal Depth in14.7Critical Depth ft/ft0.032Critical Slope ft/s7.01Velocity Page 1 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Worksheet for 8+00 Results ft0.76Velocity Head ft1.75Specific Energy 1.569Froude Number SupercriticalFlow Type GVF Input Data in0.0Downstream Depth ft0.0Length 0Number Of Steps GVF Output Data in0.0Upstream Depth N/AProfile Description ft0.00Profile Headloss ft/sInfinityDownstream Velocity ft/sInfinityUpstream Velocity in11.9Normal Depth in14.7Critical Depth ft/ft0.085Channel Slope ft/ft0.032Critical Slope Page 2 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Baxter Creek Cross Section for 8+00 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope in11.9Normal Depth cfs223.00Discharge Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/29/2022 FlowMaster [10.02.00.01]Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Worksheet for 8+40 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope cfs223.00Discharge Section Definitions Elevation(ft)Station(ft) 4,785.66-0+63 4,783.56-0+50 4,782.59-0+39 4,781.32-0+16 4,780.50-0+03 4,780.650+00 4,780.300+13 4,781.800+29 4,782.400+49 4,782.700+66 4,783.100+78 4,783.400+91 Roughness Segment Definitions Roughness CoefficientEnding StationStart Station 0.045(0+91, 4,783.40)(-0+63, 4,785.66) Options Pavlovskii's MethodCurrent Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Results in13.9Normal Depth 4,780.3 to 4,785.7 ftElevation Range ft²29.8Flow Area ft43.7Wetted Perimeter in8.2Hydraulic Radius ft43.56Top Width in13.9Normal Depth in17.3Critical Depth ft/ft0.031Critical Slope Page 1 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Worksheet for 8+40 Results ft/s7.48Velocity ft0.87Velocity Head ft2.03Specific Energy 1.594Froude Number SupercriticalFlow Type GVF Input Data in0.0Downstream Depth ft0.0Length 0Number Of Steps GVF Output Data in0.0Upstream Depth N/AProfile Description ft0.00Profile Headloss ft/sInfinityDownstream Velocity ft/sInfinityUpstream Velocity in13.9Normal Depth in17.3Critical Depth ft/ft0.085Channel Slope ft/ft0.031Critical Slope Page 2 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Baxter Creek Cross Section for 8+40 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope in13.9Normal Depth cfs223.00Discharge Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/29/2022 FlowMaster [10.02.00.01]Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Worksheet for 9+00 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope cfs223.00Discharge Section Definitions Elevation(ft)Station(ft) 4,784.08-0+59 4,783.07-0+33 4,780.09-0+10 4,780.090+00 4,780.400+12 4,780.880+24 4,781.850+49 Roughness Segment Definitions Roughness CoefficientEnding StationStart Station 0.045(0+49, 4,781.85)(-0+59, 4,784.08) Options Pavlovskii's Method Current Roughness Weighted Method Pavlovskii's MethodOpen Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Results in12.1Normal Depth 4,780.1 to 4,784.1 ftElevation Range ft²30.9Flow Area ft47.7Wetted Perimeter in7.8Hydraulic Radius ft47.62Top Width in12.1Normal Depth in15.2Critical Depth ft/ft0.032Critical Slope ft/s7.22Velocity ft0.81Velocity Head ft1.82Specific Energy 1.580Froude Number SupercriticalFlow Type Page 1 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Worksheet for 9+00 GVF Input Data in0.0Downstream Depth ft0.0Length 0Number Of Steps GVF Output Data in0.0Upstream Depth N/AProfile Description ft0.00Profile Headloss ft/sInfinityDownstream Velocity ft/sInfinityUpstream Velocity in12.1Normal Depth in15.2Critical Depth ft/ft0.085Channel Slope ft/ft0.032Critical Slope Page 2 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Baxter Creek Cross Section for 9+00 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope in12.1Normal Depth cfs223.00Discharge Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/29/2022 FlowMaster [10.02.00.01]Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Worksheet for 9+90 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope cfs223.00Discharge Section Definitions Elevation(ft)Station(ft) 4,782.44-0+82 4,781.93-0+72 4,779.20-0+14 4,778.610+00 4,779.420+14 4,779.890+23 4,779.920+32 4,779.960+44 4,780.000+63 4,780.000+75 4,779.680+87 4,779.941+00 4,780.771+17 Roughness Segment Definitions Roughness CoefficientEnding StationStart Station 0.045(1+17, 4,780.77)(-0+82, 4,782.44) Options Pavlovskii's Method Current Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Results in16.9Normal Depth 4,778.6 to 4,782.4 ftElevation Range ft²46.5Flow Area ft132.5Wetted Perimeter in4.2Hydraulic Radius ft132.39Top Width in16.9Normal Depth in18.0Critical Depth Page 1 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Worksheet for 9+90 Results ft/ft0.039Critical Slope ft/s4.80Velocity ft0.36Velocity Head ft1.76Specific Energy 1.428Froude Number SupercriticalFlow Type GVF Input Data in0.0Downstream Depth ft0.0Length 0Number Of Steps GVF Output Data in0.0Upstream Depth N/AProfile Description ft0.00Profile Headloss ft/sInfinityDownstream Velocity ft/sInfinityUpstream Velocity in16.9Normal Depth in18.0Critical Depth ft/ft0.085Channel Slope ft/ft0.039Critical Slope Page 2 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/20/2022 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8 Baxter Creek Cross Section for 9+90 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope in16.9Normal Depth cfs223.00Discharge Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 4/29/2022 FlowMaster [10.02.00.01]Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain.fm8