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T:\0742\1406\June11 CityApp\Surface Waterl <br />ER Landfill 06_2011-dead storage affect Type 1124-hr 25 yr Rainfall=4.70" <br />Prepared by Wenck Associates, Inc. Printed 8/15/2011 <br />HydroCAD® 9.10 s/n 02201 ©2010 HydroCAD Software Solutions LLC Page 22 <br />Summary for Subcatchment EX-25S: Existing watershed NW of South Expansion <br />Runoff = 1.17 cfs @ 12.14 hrs, Volume= 0.187 af, Depth= 0.38" <br />Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-96.00 hrs, dt= 0.02 hrs <br />Type II 24-hr 25 yr Rainfall=4.70" <br />Area (ac) CN Description <br />5.550 43 Woods/grass comb., Fair, HSG A <br />0.260 78 Meadow, non-grazed, HSG D <br />0.120 98 rail bed <br />5.930 46 Weighted Average <br />5.810 97.98% Pervious Area <br />0.120 2.02% Impervious Area <br />Tc Length Slope Velocity Capacity Description <br />(rnin) (feet) (ft/ft) (ft/sec) (cfs) <br />15.0 Direct Entry, <br />Subcatchment EX-25S: Existing watershed NW of South Expansion <br />Hydrograph <br />.1.17 cfs ~I <br />~~ <br />I : ~ Typie 11~24'~ hr;25 ~yr <br />' - ~ - ~ - - ~- `- -'~ - '.- - - - - =~ ~ ~ -~ - --~RainfaH=~4-.7~" - <br />1 - I' I <br />Runoff ~4rea=5.90 ac <br />,~ ~~ I ~ ~ ~ ~ Run~off~Vollur>'~e=0.1'87 ~af <br />'Ru'noff Depth=0.38" <br />... <br />3 ~ ~ ~ Tc=15.0 min <br />CN=46 <br />,,, , 6 , <br />Runoff <br />0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 <br />Time- (hours) <br />