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Z:\HydroCAD\HCDATA\MBB\ As Built <br /> 11586 SPENSA-ORONO -revised 10-28-09 Grout Riprap Type 1124-hr 2 yr Rainfall=2.80" <br /> Prepared by Anderson Engineering of MN LLC Page 2 <br /> HydroCAD®8.00 s/n 000837 0 2006 HydroCAD Software Solutions LLC 10/29/2009 <br /> Subcatchment 1 P: PROPOSED <br /> Runoff = 2.41 cfs @ 12.01 hrs, Volume= 0.134 af, Depth= 1.64" <br /> Runoff by SCS TR-20 method, UH=SCS, Time Span=4.00-27.00 hrs, dt= 0.05 hrs <br /> Type II 24-hr 2 yr Rainfall=2.80" <br /> Area (sf) CN Description <br /> 1,590 61 >75% Grass cover, Good, HSG B <br /> 190 61 >75% Grass cover, Good, HSG B <br /> 6,420 61 >75% Grass cover, Good, HSG B <br /> 7,240 85 Gravel roads, HSG B <br /> 580 85 Gravel roads, HSG B <br /> 20,460 98 Paved parking& roofs <br /> 6,060 98 Building <br /> 42,540 88 Weighted Average <br /> 16,020 Pervious Area <br /> 26,520 Impervious Area <br /> Tc Length Slope Velocity Capacity Description <br /> (min) (feet) (ft/ft) (ft/sec) (cfs) <br /> 10.0 Direct Entry, Typical Inspection <br /> Subcatchment 1X: EXISTING <br /> Runoff = 2.27 cfs @ 12.04 hrs, Volume= 0.134 af, Depth= 1.64" <br /> Runoff by SCS TR-20 method, UH=SCS, Time Span= 4.00-27.00 hrs, dt= 0.05 hrs <br /> Type II 24-hr 2 yr Rainfall=2.80" <br /> Area (sf) CN Description <br /> 1,590 61 >75% Grass cover, Good, HSG B <br /> 2,340 61 >75% Grass cover, Good, HSG B <br /> 7,240 85 Gravel roads, HSG B <br /> 13,600 85 Gravel roads, HSG B <br /> 11,760 98 Paved parking & roofs <br /> 6,060 98 Building <br /> 42,590 88 Weighted Average <br /> 24,770 Pervious Area <br /> 17,820 Impervious Area <br /> Tc Length Slope Velocity Capacity Description <br /> (min) (feet) (ft/ft) (ft/sec) (cfs) <br /> 12.0 Direct Entry,Typical Inspection <br />