Laserfiche WebLink
UWA10002 - Alley Ponding <br />Prepared by {enter your company name here} <br />HydroCAD® 9.10 s/n 01542 © 2009 HydroCAD Software Solutions LLC <br />[82] Warning: Early inflow requires earlier time span <br />[80] Warning: Exceeded Pond 4P by 0.15' @ 5.25 hrs (1.45 cfs 0.023 af) <br />[80] Warning: Exceeded Pond 12P by 0.15' @ 5.25 hrs (1.45 cfs 0.025 af) <br />Inflow Area = 0.820 ac,100.00% Impervious, Inflow Depth > 5.16" for 100 -yr event <br />Inflow = 5.50 cfs @ 11.96 hrs, Volume= 0.353 af <br />Outflow = 4.59 cfs @ 11.98 hrs, Volume= 0.352 af, Atten= 17 %, Lag= 1.5 min <br />Primary = 4.59 cfs @ 11.98 hrs, Volume= 0.352 af <br />Routing by Dyn -Stor -Ind method, Time Span= 5.00 -20.00 hrs, dt= 0.01 hrs <br />Peak Elev= 869.34' @ 12.00 hrs Surf.Area= 1,238 sf Storage= 604 cf <br />Plug -Flow detention time= 3.5 min calculated for 0.352 af (100% of inflow) <br />Center -of -Mass det. time= 2.0 min ( 732.5 - 730.5 ) <br />Volume Invert Avail.Storage Storage Description <br />#1 864.81' 1,488 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 />864.81 13 0 0 <br />868.55 13 49 49 <br />869.00 861 197 245 <br />869.40 1,303 433 678 <br />870.00 1,397 810 1,488 <br />Device Routing <br />#1 Primary <br />#2 Device 1 <br />Summary for Pond 3P: CB 403 <br />Invert Outlet Devices <br />Type 11 24 100 - yr Rainfall = 5.90" <br />Printed 12/1/2010 <br />Page 20 <br />864.81' 15.0" Round Culvert <br />L= 39.0' RCP, square edge headwall, Ke= 0.500 <br />Inlet / Outlet Invert= 864.81' / 864.50' S= 0.0079 '/' Cc= 0.900 <br />n= 0.013 Concrete pipe, straight & clean <br />868.55' 24.0" Horiz. Orifice /Grate C= 0.600 <br />Limited to weir flow at low heads <br />Primary OutFlow Max =4.50 cfs @ 11.98 hrs HW= 869.32' TW= 868.74' (Dynamic Tailwater) <br />L1= Culvert (Inlet Controls 4.50 cfs @ 3.67 fps) <br />L2= Orifice /Grate (Passes 4.50 cfs of 11.52 cfs potential flow) <br />