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2012 Construction Revision <br />Prepared by {enter your company name here) <br />HydroCAD© 10.00 s/n 00604 © 2011 HydroCAD Software Solutions LLC <br />Runoff <br />Runoff by SCS TR -20 method, UH =SCS, Time Span= 0.00 -80.00 hrs, dt= 0.01 hrs <br />Type II 24 -hr 100 -yr, 24 -hr Rainfall= 2.80" <br />Area (ac) CN <br />7.270 70 <br />7.270 <br />Tc Length Slope Velocity Capacity <br />(min) (feet) (ft/ft) (ft/sec) (cfs) <br />6.5 100 0.4000 0.26 <br />3.0 1,260 0.0700 7.10 <br />9.5 1,360 Total <br />= 6.26 cfs @ 12.03 hrs, Volume= 0.367 af, Depth= 0.61" <br />Summary for Subcatchment 4S: Area 4 <br />Description <br />Brush, Fair, HSG C <br />100.00% Pervious Area <br />Description <br />Sheet Flow, Initial <br />Grass: Dense n= 0.240 P2= 1.40" <br />85.14 Channel Flow, Channel <br />Area= 12.0 sf Perim= 14.0' r= 0.86' <br />n= 0.050 Earth, cobble bottom, clean sides <br />Subcatchment 4S: Area 4 <br />Hydrograph <br />Type 1124 -hr 100 -yr, 24 -hr Rainfall = 2.80" <br />Printed 5/10/2012 <br />Page 12 <br />Type II 24-h r <br />100 -yr <br />24 -hr Rainfall= 2.80" <br />Runoff Area =7.270 ac <br />Runoff Volume =0.367 af <br />Runoff Depth = 0.61" <br />Flow Length= 1,360' <br />Tc =9.5 min <br />CN =70 <br />0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 <br />Time (hours) <br />• Runoff <br />