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stormwater.mang.2004.pg9 47392-CLUTE - SELF STORAGE Type l/ 24-hr Rainfall=4.90" Prepared by {enter your company name here} Page 2 HydroCAD®6.10 s/n 002373 © 1986-2002 Applied Microcomputer Systems 2/3/2004 Subcatchment 1S: SOUTHWEST CORNER DRAINAGE AREA Runoff = 1.58 cfs @ 11.93 hrs, Volume= 0.065 af, Depth= 2.78" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr Rainfall=4.90" Area (sf) CN Description 1,353 98 ROOF AREA 7,616 98 Paved parking & roofs 3,259 39 >75% Grass cover, Good HSG A 122228 82 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (fUsec) (cfs) 3.0 150 0.0066 0.8 Sheet Flow, SHEET FLOW ACROSS DRAINAGE AREA Smooth surfaces n= 0.011 P2= 2.40" Subcatchment 2S: SOUTHEAST DRAINAGE AREA Runoff = 4.26 cfs @ 11.92 hrs, Volume= 0.177 af, Depth= 2.69" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr Rainfall=4.90" Area (sfl CN Description 6,765 98 BUILDING ROOFS 17,526 98 ASPHALT PAVEMENT 10,033 39 >75% Grass cover, Good, HSG A 34,324 81 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (fUft) (ft/sec) (cfs) 2.1 120 0.0100 0.9 Sheet Flow, SHEET FLOW ACROSS DRAINAGE AREA Smooth surfaces n= 0.011 P2= 2.40" Subcatchment 3S: CENTRAL DRAINAGE AREA Runoff = 4.55 cfs @ 11.90 hrs, Volume= 0.214 af, Depth= 4.28" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr Rainfall=4.90" Area (sf) CN Description 10,822 98 ROOF AREA 15,325 98 ASPHALT PAVEMENT 26,147 98 Weighted Average