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T:\0742\1406\June11 CityApp\Surface Water\ <br />ER Landfill 06_2011 Type ll 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 21 <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 />(min) (feet) (ft/ft) (ft/sec) (cfs) <br />15.0 Direct Entry, <br />Subcatchment EX-25S: Existing watershed NW of South Expansion <br />Hydrograph <br />1.1.7cfs~ ~ ~ I ~ ~ f <br />Type IL24, hr;25 ~yr <br />- -- -~_ ~___- ---~---,-, -;_.--, - --- ---;Rainfall=~.7-A"-~ <br />1 <br />Runoff area=5.90 ac ' <br />Run~off~Vo~lurne=0.187 ~af <br />~ ~ ~~ <br />"- ~ ~ '~ ~~' ~ ~Ru,noff Depth=0.38" <br />3 '. ~ ~ Tc='~5.0 min <br />~. ~ ~_ <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 />Runoff <br />