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MSE 24-hr 3 2-Year Rainfall=2.80"Upper 33rd - Proposed <br /> Printed 12/28/2022Prepared by Larson Engineering Of MN <br />Page 8HydroCAD® 10.20-2f s/n 01934 © 2022 HydroCAD Software Solutions LLC <br />Summary for Pond 4P: South System <br />Inflow Area = 7,901 sf, 54.60% Impervious, Inflow Depth = 1.54" for 2-Year event <br />Inflow = 0.43 cfs @ 12.13 hrs, Volume= 1,011 cf <br />Outflow = 0.35 cfs @ 12.17 hrs, Volume= 1,011 cf, Atten= 19%, Lag= 2.5 min <br />Primary = 0.35 cfs @ 12.17 hrs, Volume= 1,011 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= 926.35' @ 12.17 hrs Surf.Area= 98 sf Storage= 59 cf <br />Plug-Flow detention time= 2.0 min calculated for 1,011 cf (100% of inflow) <br />Center-of-Mass det. time= 2.0 min ( 767.4 - 765.3 ) <br />Volume Invert Avail.Storage Storage Description <br />#1 925.50' 377 cf 48.0" Round Pipe Storage <br />L= 30.0' <br />Device Routing Invert Outlet Devices <br />#1 Primary 925.50'12.0" Round Culvert <br />L= 73.0' CPP, square edge headwall, Ke= 0.500 <br />Inlet / Outlet Invert= 925.50' / 924.70' S= 0.0110 '/' Cc= 0.900 <br />n= 0.013 Corrugated PE, smooth interior, Flow Area= 0.79 sf <br />#2 Device 1 929.25'4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) <br />#3 Device 1 927.25'4.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads <br />#4 Device 1 925.50'4.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads <br />Primary OutFlow Max=0.35 cfs @ 12.17 hrs HW=926.35' TW=0.00' (Dynamic Tailwater) <br />1=Culvert (Passes 0.35 cfs of 2.24 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 0.35 cfs @ 3.98 fps)