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Spillway 1-day 10-day 100-yr, 10-day Rainfall=7.20", AMC=4Upper 33rd - Proposed <br /> Printed 12/28/2022Prepared by Larson Engineering Of MN <br />Page 27HydroCAD® 10.20-2f s/n 01934 © 2022 HydroCAD Software Solutions LLC <br />Summary for Pond 5P: North System <br />Inflow Area = 9,599 sf, 59.82% Impervious, Inflow Depth = 6.96" for 100-yr, 10-day event <br />Inflow = 0.11 cfs @ 121.30 hrs, Volume= 5,568 cf <br />Outflow = 0.10 cfs @ 121.47 hrs, Volume= 5,568 cf, Atten= 3%, Lag= 10.2 min <br />Primary = 0.10 cfs @ 121.47 hrs, Volume= 5,568 cf <br /> Routed to Reach 1R : Offsite South <br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-260.00 hrs, dt= 0.01 hrs <br />Peak Elev= 925.81' @ 121.47 hrs Surf.Area= 220 sf Storage= 47 cf <br />Plug-Flow detention time= 8.8 min calculated for 5,568 cf (100% of inflow) <br />Center-of-Mass det. time= 8.8 min ( 7,419.3 - 7,410.5 ) <br />Volume Invert Avail.Storage Storage Description <br />#1 925.50' 848 cf 36.0" Round Pipe Storage <br />L= 120.0' <br />Device Routing Invert Outlet Devices <br />#1 Primary 925.50'12.0" Round Culvert <br />L= 78.0' CPP, square edge headwall, Ke= 0.500 <br />Inlet / Outlet Invert= 925.50' / 924.70' S= 0.0103 '/' Cc= 0.900 <br />n= 0.013 Corrugated PE, smooth interior, Flow Area= 0.79 sf <br />#2 Device 1 928.25'4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) <br />#3 Device 1 927.00'6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads <br />#4 Device 1 925.50'3.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads <br />Primary OutFlow Max=0.10 cfs @ 121.47 hrs HW=925.81' TW=0.00' (Dynamic Tailwater) <br />1=Culvert (Passes 0.10 cfs of 0.40 cfs potential flow) <br />2=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) <br />3=Orifice/Grate ( Controls 0.00 cfs) <br />4=Orifice/Grate (Orifice Controls 0.10 cfs @ 2.08 fps)