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T:\0742114061June11 CityApp\Surface Water\ <br />ER Landfill 06_2011 Type I! 24-hr 25 yr Rainfall=4.70" <br />Prepared by Wenck Associates, Inc. Printed 8/2/2011 <br />HydroCAD® 9.10 s/n 02201 ©2010 HydroCAD Software Solutions LLC Page 29 <br />Summary for Pond 25P: Basin east of RR, NW of S expansion <br />[79] Warning: Submerged Pond P-1 Primary device # 1 OUTLET by 2.00' <br />Inflow Area = 43.232 ac, 0.28% Impervious, Inflow Depth > 0.64" for 25 yr event <br />Inflow = 1.83 cfs @ 18.38 hrs, Volume= 2.298 of <br />Outflow = 1.82 cfs @ 19.05 hrs, Volume= 2.272 af, Atten= 0%, Lag= 40.2 min <br />Primary = 1.82 cfs @ 19.05 hrs, Volume= .2.272 of <br />Routing by Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.02 hrs <br />Peak Elev= 959.00' @ 19.05 hrs Surf.Area= 0.204 ac Storage= 0.142 of <br />Plug-Flow detention time= 105.6 min calculated for 2.271 of (99% of inflow) <br />Center-of--Mass det. time= 65.6 min (1,536.7 - 1,471.1 ) <br />Volume Invert Avail.Storage Storage Description <br />#1 958.00' 3.450 of Custom Stage Data (Prismatic)Listed below (Recalc) <br />Elevation Surf.Area Inc.Store Cum.Store <br />(feet) (acres) (acre-feet) (acre-feet) <br />958.00 0.080 0.000 0.000 <br />960.00 0.330 0.410 0.410 <br />962.00 0.750 1.080 1.490 <br />964.00 1.210 1.960 3.450 <br />Device Routing Invert Outlet Devices <br />#1 Primary 963.50' 8.0' long x 8.0' breadth Broad-Crested Rectangular Weir <br />Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 <br />2.50 3.00 3.50 4.00 4.50 5.00 5.50 <br />Coef. (English) 2.43 2.54 2.70 2.69 2.68 2.68 2.66 2.64 2.64 <br />2.64 2.65 2.65 2.66 2.66 2.68 2.70 2.74 <br />#2 Primary 958.23' 15.0" Round Culvert <br />L= 25.0' RCP, square edge headwall, Ke= 0.500 <br />Inlet /Outlet Invert= 958.23' / 958.06' S= 0.0068 '/' Cc= 0.900 <br />n= 0.013 <br />Primary OutFlow Max=1.82 cfs @ 19.05 hrs HW=959.00' (Free Discharge) <br />~1=Broad-Crested Rectangular Weir(Controls 0.00 cfs) <br />2=Culvert (Barrel Controls 1.82 cfs @ 3.31 fps) <br />