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C:�Program Files�FiydroCAD�ProjectslHydroCAD Projects\08 JOBS\ <br /> 08175B Barry Sewall Proposed Conditions May 13, 2009 Type ll 24hr 10 Year Rainfa11=4.20" <br /> Prepared by Gronberg &Associates, Inc. Printed 5/20/2009 9:09:37 AM <br /> HydroCAD�9.00 s/n 04529 �2009 HydroCAD Software Solutions LLC Paae 15 <br /> Summary for Subcatchmer�t A3: Area 3 <br /> Runoff = 0.66 cfs� 12.04 h�s, Volume= 0.038 af, Depth> 0.66" <br /> Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs <br /> Type II 24-hr 10 Year Rainfa11=4.20" <br /> Area (ac) CN Description <br /> 0.015 98 Paved parking 8 roofs <br /> 0.220 61 >75% Grass cover, Good, HSG B <br /> 0.450 55 Woods, Good, HSG B <br /> 0.685 58 Weighted Average <br /> 0.670 97.81% Pervious Area <br /> 0.015 2.19% Impervious Area <br /> Tc Length Slope Velocity Capacity Description <br /> (min) (feet) (ftlft) (ft/sec) (cfs) <br /> 10.0 Direct ErKry, <br />