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• <br />PHASE 2 INTERIM WASTE PILE Type Il 24-hr Rainfall=2.90" <br />Prepared by Greg Lewicki & Associates Page 5 <br />HydroCAD® 8.00 s/n 004412 © 2006 HydroCAD Software Solutions LLC 4/17/2007 <br />Subcatchment 2 Tn: Temporary Tn Basin <br />Runoff = 9.71 cfs @ 12.07 hrs, Volume= 0.644 af, Depth= 1.81" <br />Runoff by SCS TR-20 method, UH=SCS, Time Span= 1.00-30.00 hrs, dt= 0.05 hrs <br />Type 11 24-hr Rainfall=2.90" <br />Area (ac) CN Description <br />4.270 89 Waste material, HSG D <br />4.270 Pervious Area <br />Tc Length Slope Velocity Capacity Description <br />(min) (feet) (ft/ft) (ft/sec) (cfs) <br />15.5 834 0.0167 0.89 Lag/CN Method, <br />Subcatchment 2 Tn: Temporary Tn Basin <br />Hydrograph <br />10 <br />9 <br />8 <br />7 <br />10 <br />tlD 6 <br />0 5 <br />LL <br />4 <br />3 <br />2 <br />1 <br />Runoff=9.71 cfs <br />Type II 24-hr <br />Rainfall=2.90" <br />Runoff Area=4.270 ac <br />Runoff Volume=0.644 of <br />Runoff Depth=1.81" <br />Flow Length=834' <br />Slope=0.0167 '/' <br />Tc=15.5 min <br />CN=89 <br />o - <br />1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 <br />Time (hours) <br />- RunofF <br />•