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11586 SPENSA-ORONO Type 11 24-hr 10 yr Rainfall=4.20" <br /> Prepared by{enter your company name here} Page 11 <br /> HydroCAD®8.00 s/n 000837 ©2006 HydroCAD Software Solutions LLC 5/18/2009 <br /> Subcatchment 1S: EXISTING <br /> Runoff = 2.96 cfs @ 12.03 hrs, Volume= 0.169 af, Depth> 2.91" <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 yr Rainfall=4.20" <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 /> 1,360 85 Gravel roads, HSG B <br /> 11,760 98 Paved parking & roofs <br /> 6,060 98 Building <br /> 30,350 90 Weighted Average <br /> 12,530 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 /> Subcatchment 1S: EXISTING <br /> Hydrograph <br /> I I I 1 2.96 cfs . I I I i Runoff <br /> 3------------------ <br /> 1 I I I I I 1 I I I I I <br /> Type II 24-ht 10;yr <br /> 1 I I 1 I I I I I I 1 <br /> Rairifa11-:4.20" <br /> RUno;ff Asea=30, 50;sf <br /> ---'Frunoff V0161rfi4=1D. 69 a#- <br /> 1 1 I 1 I I I <br /> Ruoff Depth>2.0119 <br /> OI I I I I 1 1 I I I I 1 <br /> Tc=12;0I mI in <br /> I I I I I 1 I 1 I I I I <br /> I I I I I 1 I 1 I I I I ■'_N=90 <br /> I 1 1 I 1 I I t I I I I I <br /> I 1 I I I I I I I I I I I <br /> 1 I I I I I I I I I I I <br /> I I I I I I I 1 I I I I <br /> I I I I I I I I I I I 1 <br /> I I 1 I 1 I I 1 I I I I 1 <br /> I I I I I I I I I I 1 <br /> O <br /> 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 <br /> Time (hours) <br />