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stormwater.mang.2004.pg10 47392-CLUTE - SELF STORAGE Type l/ 24-hr Rainfall=4.90" Prepared by {enter your company name here} Page 3 HydroCADO 6.10 s/n 002373 © 1986-2002 Applied Microcomputer Systems 2/3/2004 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.4 70 0.0107 0.9 Sheet Flow, SHEET FLOW ACROSS DRAINAGE AREA Smooth surfaces n= 0.011 P2= 2.40" Subcatchment 4S: NORTH DRAINAGE AREA Runoff = 5.59 cfs @ 11.92 hrs, Volume= 0.231 af, Depth= 2.60" 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 8,117 98 BUILDING ROOF 23,891 98 ASPHALT PAVEMENT 14,377 39 >75% Grass cover, Good HSG A 46.385 80 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (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" Pond 1P: SOUTHWEST DETENTION BASIN Inflow Area = 0.281 ac, Inflow Depth = 2.78" Inflow = 1.58 cfs @ 11.93 hrs, Volume= 0.065 of Outflow = 0.85 cfs @ 12.01 hrs, Volume= 0.065 af, Atten= 46%, Lag= 4.6 min Discarded = 0.85 cfs @ 12.01 hrs, Volume= 0.065 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 97.10' Surf.Area= 614 sf Storage= 484 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Storage and wetted areas determined by Prismatic sections Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 96.00 251 0 0 97.00 540 396 396 98.00 1,311 926 1,321 Discarded OutFlow Max=0.84 cfs @ 12.01 hrs HW=97.08' (Free Discharge) t--1=Exfiltration (Controls 0.84 cfs) # Routing Invert Outlet Devices 1 Discarded 0.00' 0.083300 fpm Exfiltration over entire Surface area