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UWA10002 - Alley Ponding Type 11 24-hr 100 -yr Rainfall = 5.90" <br />Prepared by {enter your company name here} Printed 12/1/2010 <br />HydroCAD® 9.10 s/n 01542 © 2009 HydroCAD Software Solutions LLC Page 25 <br />Summary for Pond 7P: CB 404A <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 = 0.030 ac,100.00% Impervious, Inflow Depth > 5.18" for 100 -yr event <br />Inflow = 0.26 cfs @ 11.96 hrs, Volume= 0.013 af <br />Outflow = 1.20 cfs @ 12.10 hrs, Volume= 0.013 af, Atten= 0 %, Lag= 8.6 min <br />Primary = 1.20 cfs @ 12.10 hrs, Volume= 0.013 af <br />Routing by Dyn -Stor -Ind method, Time Span= 5.00 -20.00 hrs, dt= 0.01 hrs <br />Peak Elev= 869.44' @ 12.04 hrs Surf.Area= 563 sf Storage= 178 cf <br />Plug -Flow detention time= 23.2 min calculated for 0.013 af (98% of inflow) <br />Center -of -Mass det. time= 13.0 min ( 741.5 - 728.5 ) <br />Volume Invert Avail.Storage Storage Description <br />#1 865.42' 660 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 />865.42 4 0 0 <br />868.63 4 13 13 <br />869.00 100 19 32 <br />869.50 625 181 213 <br />870.00 1,162 447 660 <br />Device Routing <br />#1 Primary <br />#2 Device 1 <br />Invert Outlet Devices <br />865.42' 12.0" Round Culvert <br />L= 11.0' RCP, square edge headwall, Ke= 0.500 <br />Inlet / Outlet Invert= 865.42' / 865.31' 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 @ 12.10 hrs HW= 869.34' TW= 869.40' (Dynamic Tailwater) <br />L1= Culvert ( Controls 0.00 cfs) <br />L2= Orifice /Grate ( Controls 0.00 cfs) <br />