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T:\0742\1406\June11 CityApp\Surface Water\
<br />ER Landfill 06_2011 Type 1124-hr 25 yr Rainfall=4.70"
<br />Prepared by Wenck Associates, Inc. Printed 812/2011
<br />HydroCAD® 9.10 s/n 02201 ©2010 HydroCAD Software Solutions LLC Page 39
<br />Summary for Pond P-2: SE pond
<br />Inflow Area = .16.288 ac, 0.00% Impervious, Inflow Depth = 2.49" for 25 yr event
<br />Inflow = 58.31 cfs @ 12.00 hrs, Volume= 3.384 of
<br />Outflow = 0.68 cfs @ 24.05 hrs, Volume= 0.620 af, Atten= 99%, Lag= 722.9 min
<br />Primary = 0.68 cfs @ 24.05 hrs, Volume= 0.620 of
<br />Routing by Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.02 hrs
<br />Peak Elev= 1,021.39' @ 24.05 hrs Surf.Area= 39,939 sf .Storage= 134,703 cf
<br />Plug-Flow detention time= 1,005.0 min calculated for 0.620 of (18% of inflow)
<br />Center-of-Mass det. time= 862.0 min (1,691.9 - 829.8 )
<br />Volume Invert Avail.Storage Storage Description
<br />#1 1,016.00' 501,090 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 />1,016.00 0 0 0
<br />1,018.00 24,905 24,905 24,905
<br />1,020.00 33,771 58,676 83,581
<br />1,022.00 42,664 76,435 160,016
<br />1,024.00 51,937 94,601 254,617
<br />1,026.00 61,532 113,469 368,086
<br />1,028.00 71,472 1.33,004 501,090
<br />Device Routing Invert Outlet Devices
<br />#1 Primary 1,021.00' 18.0" Round Culvert
<br />L= 120.0' RCP, mitered to conform to fill, Ke= 0.700
<br />Inlet /Outlet Invert= 1,021.00' / 998.00' S= 0.1917 'P Cc= 0.900
<br />n= 0.012 Concrete pipe, finished
<br />Primary OutFlow Max=0.68 cfs @ 24.05 hrs HW=1,021.39' (Free Discharge)
<br />'L1=Culvert (Inlet Controls 0.68 cfs @ 1.87 fps)
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