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HomeMy WebLinkAbout19 Civil Engineering Report App F Basin Flow RatesBasin Area (ac): 1.18Post-Dev C (weighted): 0.90 Storm Event IntensityOverland Distance (ft): 300(yr) (in/hr)A BOverland Slope (%): 1.02 1.37 0.36 0.6Post-Dev. Tc (min): 65 2.16 0.52 0.64Storm Event (yr):2102510010 2.72 0.64 0.65Storm Coeff. A: 0.36 0.64 0.78 1.01 25 3.24 0.78 0.64Storm Coeff. B:0.60 0.65 0.64 0.67 50 4.00 0.92 0.66Composite C: 0.90 0.90 0.90 0.90 100 4.49 1.01 0.67Storm Intensity (in/hr): 1.37 2.72 3.24 4.49Post-Dev Qp (cfs):1.45 2.89 3.44 4.77Equations Used: Qp = C i A (Modified Rational Method)tc=((1.8)*(1.1-C)*(D^(1/2)))/(S^(1/3)) (City of Bozeman)EAST FRONTAGE DEVELOPMENTBASIN APOST-DEVELOPMENT SUB BASIN FLOWSStorm Coeff. (i)L:\193190\Computations\Basin Flow Rates.xls Basin Area (ac): 0.83Post-Dev C (weighted): 0.90 Storm Event IntensityOverland Distance (ft): 260(yr) (in/hr)A BOverland Slope (%): 1.02 1.43 0.36 0.6Post-Dev. Tc (min): 65 2.26 0.52 0.64Storm Event (yr):2102510010 2.85 0.64 0.65Storm Coeff. A: 0.36 0.64 0.78 1.01 25 3.39 0.78 0.64Storm Coeff. B:0.60 0.65 0.64 0.67 50 4.19 0.92 0.66Composite C: 0.90 0.90 0.90 0.90 100 4.71 1.01 0.67Storm Intensity (in/hr): 1.43 2.85 3.39 4.71Post-Dev Qp (cfs):1.07 2.13 2.54 3.52Equations Used: Qp = C i A (Modified Rational Method)tc=((1.8)*(1.1-C)*(D^(1/2)))/(S^(1/3)) (City of Bozeman)EAST FRONTAGE DEVELOPMENTBASIN BPOST-DEVELOPMENT SUB BASIN FLOWSStorm Coeff. (i)L:\193190\Computations\Basin Flow Rates.xls Basin Area (ac): 1.19Post-Dev C (weighted): 0.90 Storm Event IntensityOverland Distance (ft): 300(yr) (in/hr)A BOverland Slope (%): 1.02 1.37 0.36 0.6Post-Dev. Tc (min): 65 2.16 0.52 0.64Storm Event (yr):2102510010 2.72 0.64 0.65Storm Coeff. A: 0.36 0.64 0.78 1.01 25 3.24 0.78 0.64Storm Coeff. B:0.60 0.65 0.64 0.67 50 4.00 0.92 0.66Composite C: 0.90 0.90 0.90 0.90 100 4.49 1.01 0.67Storm Intensity (in/hr): 1.37 2.72 3.24 4.49Post-Dev Qp (cfs):1.47 2.91 3.47 4.81Equations Used: Qp = C i A (Modified Rational Method)tc=((1.8)*(1.1-C)*(D^(1/2)))/(S^(1/3)) (City of Bozeman)EAST FRONTAGE DEVELOPMENTBASIN CPOST-DEVELOPMENT SUB BASIN FLOWSStorm Coeff. (i)L:\193190\Computations\Basin Flow Rates.xls Basin Area (ac): 1.00Post-Dev C (weighted): 0.20 Storm Event IntensityOverland Distance (ft): 300(yr) (in/hr)A BOverland Slope (%): 1.02 0.56 0.36 0.6Post-Dev. Tc (min): 295 0.83 0.52 0.64Storm Event (yr):2102510010 1.02 0.64 0.65Storm Coeff. A: 0.36 0.64 0.78 1.01 25 1.24 0.78 0.64Storm Coeff. B:0.60 0.65 0.64 0.67 50 1.48 0.92 0.66Composite C: 0.20 0.20 0.20 0.20 100 1.64 1.01 0.67Storm Intensity (in/hr): 0.56 1.02 1.24 1.64Post-Dev Qp (cfs):0.11 0.20 0.25 0.33Equations Used: Qp = C i A (Modified Rational Method)tc=((1.8)*(1.1-C)*(D^(1/2)))/(S^(1/3)) (City of Bozeman)EAST FRONTAGE DEVELOPMENTBASIN DPOST-DEVELOPMENT SUB BASIN FLOWSStorm Coeff. (i)L:\193190\Computations\Basin Flow Rates.xls Approach Storm Pipe - 25 Year Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data 0.010Roughness Coefficient ft/ft0.005Channel Slope in12.0Diameter cfs2.27Discharge Results in7.4Normal Depth ft²0.5Flow Area ft1.8Wetted Perimeter in3.4Hydraulic Radius ft0.97Top Width in7.7Critical Depth %61.3Percent Full ft/ft0.004Critical Slope ft/s4.50Velocity ft0.31Velocity Head ft0.93Specific Energy 1.103Froude Number cfs3.52Maximum Discharge cfs3.27Discharge Full ft/ft0.002Slope Full 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 %0.0Average End Depth Over Rise %61.3Normal Depth Over Rise ft/sInfinityDownstream Velocity ft/sInfinityUpstream Velocity in7.4Normal Depth in7.7Critical Depth ft/ft0.005Channel Slope ft/ft0.004Critical Slope Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 3/26/2021 FlowMaster [10.02.00.01] Bentley Systems, Inc. Haestad Methods Solution CenterUntitled1.fm8