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HomeMy WebLinkAboutApplication Files_85048_pg0216 POST DEVELOPMENT- DP1 2007-058 Jones-POST 131 Type Ill 24-hr 10-year Rainfall=4.70" Prepared by J.R. Russo &Associates Printed 12/27/2010 HydroCADO 8.50 s/n 002386 ©2007 HydroCAD Software Solutions LLC Page 13 Area (ac) CN Description ' 2.000 98 Paved parking & roofs 0.060 74 >75% Grass cover, Good, HSG C 0.270 61 >75% Grass cover, Good, HSG B 2.330 93 Weighted Average 0.330 Pervious Area 2.000 Impervious Area ' Tc Length Slope Velocity Capacity Description _(min) (feet) (ft/ft) (ft/sec) (cfs) 14.9 100 0.0180 0.11 Sheet Flow, ' Grass: Dense n= 0.240 P2= 3.20" 1.2 70 0.0200 0.99 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps ' 1.0 180 0.0200 2.87 Shallow Concentrated Flow, Paved Kv=20.3 fps 17.1 350 Total Summary for Subcatchment 13: To Lower Basin #5 Runoff = 3.37 cfs @ 12.15 hrs, Volume= 0.294 af, Depth= 3.80" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-80.00 hrs, dt=0.01 hrs Type III 24-hr 10-year Rainfall=4.70" Area (ac) CN Description 0.750 98 Paved parking & roofs 0.080 74 >75% Grass cover, Good, HSG C 0.100 61 >75% Grass cover, Good, HSG B 0.930 92 Weighted Average ' 0.180 Pervious Area 0.750 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.1 62 0.0240 0.11 Sheet Flow, Grass: Dense n=0.240 P2= 3.20" 0.7 38 0.0100 0.86 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.20" 1.1 298 0.0050 4.55 8.05 Circular Channel (pipe), Diam= 18.0" Area= 1.8 sf Perim=4.7' r=0.38' n= 0.012 10.9 398 Total