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MSE 24-hr 3 10-Year Rainfall=4.20"Upper 33rd - Proposed <br /> Printed 12/28/2022Prepared by Larson Engineering Of MN <br />Page 15HydroCAD® 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 = 2.74" for 10-Year event <br />Inflow = 0.94 cfs @ 12.14 hrs, Volume= 2,192 cf <br />Outflow = 0.41 cfs @ 12.25 hrs, Volume= 2,192 cf, Atten= 56%, Lag= 6.8 min <br />Primary = 0.41 cfs @ 12.25 hrs, Volume= 2,192 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= 927.20' @ 12.25 hrs Surf.Area= 357 sf Storage= 497 cf <br />Plug-Flow detention time= 14.1 min calculated for 2,191 cf (100% of inflow) <br />Center-of-Mass det. time= 14.4 min ( 775.9 - 761.5 ) <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=0.41 cfs @ 12.25 hrs HW=927.20' TW=0.00' (Dynamic Tailwater) <br />1=Culvert (Passes 0.41 cfs of 3.89 cfs potential flow) <br />2=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) <br />3=Orifice/Grate (Orifice Controls 0.12 cfs @ 1.54 fps) <br />4=Orifice/Grate (Orifice Controls 0.30 cfs @ 6.05 fps)