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Benedicting Innsbruck Hydro MN-New Brighton 24-hr S1 2-yr Rainfall=2.84"
<br /> Prepared by Sunde Engineering Printed 2/13/2020
<br /> HydroCAD® 10.00-20 s/n 02350 ©2017 HydroCAD Software Solutions LLC Page 16
<br /> Tc Length Slope Velocity Capacity Description
<br /> (min) (feet) (ft/ft) (ft/sec) (cfs)
<br /> 6.0 Direct Entry, Assumed
<br /> Summary for Subcatchment EX 3: Existing
<br /> Runoff = 5.93 cfs @ 12.04 hrs, Volume= 13,495 cf, Depth= 1.68"
<br /> Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs
<br /> MN-New Brighton 24-hr S1 2-yr Rainfall=2.84"
<br /> Area (sf) CN Description
<br /> 57,643 98 Paved parking, HSG C
<br /> 38,940 74 >75% Grass cover, Good, HSG C
<br /> 96,583 88 Weighted Average
<br /> 38,940 40.32% Pervious Area
<br /> 57,643 59.68% Impervious Area
<br /> Tc Length Slope Velocity Capacity Description
<br /> (min) (feet) (ft/ft) (ft/sec) (cfs)
<br /> 6.0 Direct Entry, Assumed
<br /> Summary for Pond 1 P:
<br /> Inflow Area = 215,822 sf, 72.21% Impervious, Inflow Depth = 2.00" for 2-yr event
<br /> Inflow = 14.02 cfs @ 12.04 hrs, Volume= 36,024 cf
<br /> Outflow = 14.02 cfs @ 12.04 hrs, Volume= 36,024 cf, Atten= 0%, Lag= 0.0 min
<br /> Primary = 14.02 cfs @ 12.04 hrs, Volume= 36,024 cf
<br /> Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs
<br /> Peak Elev= 937.84' @ 12.04 hrs
<br /> Device Routing Invert Outlet Devices
<br /> #1 Primary 936.11' 30.0" Round Culvert
<br /> L= 36.0' RCP, sq.cut end projecting, Ke= 0.500
<br /> Inlet/ Outlet Invert= 936.11' /935.70' S= 0.0114 '/' Cc= 0.900
<br /> n= 0.013 Corrugated PE, smooth interior, Flow Area= 4.91 sf
<br /> Primary OutFlow Max=13.68 cfs @ 12.04 hrs HW=937.81' (Free Discharge)
<br /> 4-1=Culvert (Barrel Controls 13.68 cfs @ 5.43 fps)
<br /> Summary for Pond 2P:
<br /> Inflow Area = 101,504 sf, 80.73% Impervious, Inflow Depth = 2.18" for 2-yr event
<br /> Inflow = 6.51 cfs @ 12.04 hrs, Volume= 18,481 cf
<br /> Outflow = 6.51 cfs @ 12.04 hrs, Volume= 18,481 cf, Atten= 0%, Lag= 0.0 min
<br /> Primary = 6.51 cfs @ 12.04 hrs, Volume= 18,481 cf
<br /> Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs
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