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HomeMy WebLinkAboutApplication Files_85048_pg0240 POST DEVELOPMENT- DP2 2007-058 Jones-Post DP2 Type/1/24-hr 10-year Rainfall=4.70" Prepared by J.R. Russo &Associates Printed 12/2/2010 HydroCAD®8.50 s/n 002386 ©2007 HydroCAD Software Solutions LLC Page 3 Summary for Subcatchment 20: To DP#2 Runoff = 4.21 cfs @ 13.03 hrs, Volume= 0.863 af, Depth> 0.82" Runoff by SCS TR-20 method, UH=SCS, Time Span= 2.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10-year Rainfall=4.70" Area (ac) CN Description 0.200 98 Paved parking & roofs 1.020 70 Woods, Good, HSG C 6.920 55 Woods, Good, HSG B 2.600 30 Woods, Good, HSG A 0.580 61 >75% Grass cover, Good, HSG B 1.370 98 Water Surface 12.690 57 Weighted Average 11.120 Pervious Area 1.570 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.9 100 0.0500 0.11 Sheet Flow, Woods: Light underbrush n=0.400 P2= 3.20" 51.9 1,100 0.0050 0.35 Shallow Concentrated Flow, Woodland Kv=5.0 fps 66.8 1,200 Total Summary for Pond DP2: Design Point#2 Inflow Area = 12.690 ac, 12.37% Impervious, Inflow Depth > 0.82" for 10-year event Inflow = 4.21 cfs @ 13.03 hrs, Volume= 0.863 of Primary = 4.21 cfs @ 13.03 hrs, Volume= 0.863 af, Atten=0%, Lag= 0.0 min Routing by Stor-Ind method, Time Span=2.00-20.00 hrs, dt= 0.05 hrs I