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<br />2058.0010 Prop Drain <br />Prepared by {enter your company name here} <br />HydroCAOO 8.00 sin 001304 @ 2006 HydroCAD Software Solutions LLC <br /> <br />Type /I 24-hr 2- Year; 24 hour Rainfal/=2.70" <br />Page 5 <br />9/18/2007 <br /> <br />5ubcatchment 25: Proposed Drainage Area to Pond <br /> <br />Runoff <br /> <br />= <br /> <br />4.64 cfs @ 11.96 hrs, Volume= <br /> <br />0.224 af, Depth= 1.97" <br /> <br />Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs <br />Type II 24-hr 2-Year; 24 hour Rainfall=2.70" <br /> <br />Area (sf) <br />51 ,202 <br />8,159 <br />59,361 <br />8,159 <br />51 ,202 <br /> <br />CN Description <br />98 Impervious Surfaces (Building/Pavement) <br />61 >75% Grass cover, Good, HSG B <br />93 Weighted Average <br />Pervious Area <br />Impervious Area <br /> <br />Tc Length Slope Velocity Capacity Description <br />(min) (feet) (fUft) (fUsee) (cfs) <br />2.2 125 0.0100 0.96 Sheet Flow, Roof runoff to curb line <br /> Smooth surfaces n= 0.011 P2= 2.50" <br />1.9 165 0.0050 1.44 Shallow Concentrated Flow, Flow along curb line <br /> Paved Kv= 20.3 fps <br />1.3 160 0.0187 2.05 Shallow Concentrated Flow, Grass Swale to Pond - East side <br /> Grassed Waterway Kv= 15.0 fps <br />5.4 450 Total <br />