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UWA10002 - Alley Ponding <br />Prepared by {enter your company name here} <br />HydroCAD® 9.10 s/n 01542 © 2009 HydroCAD Software Solutions LLC <br />Summary for Pond 13P: CB 410A <br />[82] Warning: Early inflow requires earlier time span <br />[90] Warning: Qout >Qin may require Finer Routing or smaller dt <br />[87] Warning: Oscillations may require Finer Routing or smaller dt <br />Inflow Area = 0.049 ac,100.00% Impervious, Inflow Depth > 5.18" for 100 -yr event <br />Inflow = 0.42 cfs @ 11.96 hrs, Volume= 0.021 af <br />Outflow = 1.35 cfs @ 12.12 hrs, Volume= 0.021 af, Atten= 0 %, Lag= 9.8 min <br />Primary = 1.35 cfs @ 12.12 hrs, Volume= 0.021 af <br />Routing by Dyn -Stor -Ind method, Time Span= 5.00 -20.00 hrs, dt= 0.01 hrs <br />Peak Elev= 869.38' @ 12.05 hrs Surf.Area= 1,200 sf Storage= 272 cf <br />Plug -Flow detention time= 15.4 min calculated for 0.021 af (99% of inflow) <br />Center -of -Mass det. time= 9.2 min ( 737.7 - 728.5 ) <br />Volume Invert Avail.Storage Storage Description <br />#1 865.48' 1,302 cf Custom Stage Data (Prismatic) Listed below (Recalc) <br />Elevation Surf.Area Inc.Store Cum.Store <br />(feet) (sq -ft) (cubic -feet) (cubic -feet) <br />865.48 4 0 0 <br />868.63 4 13 13 <br />869.00 78 15 28 <br />869.40 1,253 266 294 <br />870.00 2,107 1,008 1,302 <br />Device Routing <br />#1 Primary <br />#2 Device 1 <br />Invert Outlet Devices <br />Type 11 24 100 - yr Rainfall = 5.90" <br />Printed 12/1/2010 <br />Page 33 <br />865.48' 12.0" Round Culvert <br />L= 15.0' RCP, square edge headwall, Ke= 0.500 <br />Inlet / Outlet Invert= 865.48' / 865.33' S= 0.0100 '/' Cc= 0.900 <br />n= 0.013 Concrete pipe, straight & clean <br />868.63' 24.0" Horiz. Orifice /Grate C= 0.600 <br />Limited to weir flow at low heads <br />Primary OutFlow Max =0.00 cfs @ 12.12 hrs HW= 869.30' TW= 869.38' (Dynamic Tailwater) <br />L1= Culvert ( Controls 0.00 cfs) <br />L2= Orifice /Grate ( Controls 0.00 cfs) <br />