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4203 NORTH �HORE DRIVE Type 1124hr Rainfall=4.20" <br /> Prepared by Terra Engineering Inc. Page 3 <br /> HydroCAD�7.00 s/n 001544 C�1986-2003 Applied Microcomputer Systems 10/11/2005 <br /> Subcatchment 1S: EXISTING DRAINAGE AREA(FLOWS TO EASTj <br /> Runoff = 0.59 cfs @ 12.05 hrs, Volume= 0.033 af, Depth= 2.11" <br /> Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.p0-20.00 hrs, dt= 0.05 hrs <br /> Type II 24hr Rainfa11=4.20" <br /> Area (s� CN Descriqtion <br /> 2,214 98 Paved parking �roofs <br /> 5 931 74 >75% Grass cover, Good, HSG C <br /> 8,145 81 Weighted Average <br /> Tc Length Slope Velocity Capacity Description <br /> (min) (feet) (ff/ft) (ft/sec) (cfs} <br /> 12.8 150 U.Q800 0.2 Sheet Flow, <br /> Grass: Dense n=0.240 P2=2.50" <br /> Subcatchment 2S: PROPOSED DRAINAGE AREA(FLOWS TO EAST) <br /> Runoff = 0.38 cfs @ 12.01 hrs, Volume= 0.019 af, Depth= 1.59" <br /> Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs <br /> Type II 24hr Rainfa11=4.20" <br /> Ar�a (sfl CN Description <br /> 6,177 74 >75% Grass cover, Good, HSG C <br /> Tc Length Slope Velocity Capacity Description <br /> (min) (feefl (ft/ft) (ft/sec) {cfs) <br /> 9.4 80 0.0500 0.1 Sheet Flow, <br /> Grass: Dense n= 0.24Q P2=2.50" <br />