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HomeMy WebLinkAboutApplication Files_85048_pg0194 PRE-DEVELOPMENT DRAINAGE 2007-058 Jones-PRE Type Ill 24-hr 90-year Rainfall=4.70" Prepared by J.R. Russo &Associates Printed 12/11/2010 HydroCADO 8.50 s/n 002386 ©2007 HVdroCAD Software Solutions LLC Page 4 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 28.3 100 0.0100 0.06 Sheet Flow, Woods: Light underbrush n=0.400 P2= 3.20" 1.7 50 0.0100 0.50 Shallow Concentrated Flow, ' Woodland Kv= 5.0 fps 1.1 130 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 2.9 700 0.0050 4.03 4.95 Circular Channel (pipe), Diam= 15.0" Area= 1.2 sf Perim= 3.9' r= 0.31' n=0.012 1.9 520 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 35.9 1,500 Total Summary for Subcatchment 2: To Sullivan Ave East Runoff = 3.55 cfs @ 12.64 hrs, Volume= 0.569 af, Depth= 1.53" Runoff by SCS TR-20 method, UH=SCS, Time Span= 1.00-72.00 hrs, dt= 0.01 hrs Type III 24-hr 10-year Rainfall=4.70" Area_(ac) CN Description 1.140 75 Row crops, SR+ CR, Good, HSG B 0.080 82 Row crops, SR + CR, Good, HSG C 0.200 98 Paved parking &roofs 0.160 74 >75% Grass cover, Good, HSG C 0.520 61 >75% Grass cover, Good, HSG B 0.270 72 Woods/grass comb., Good, HSG C 2.100 58 Woods/grass comb., Good, HSG B 4.470 66 Weighted Average 4.270 Pervious Area 0.200 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" 7.1 150 0.0050 0.35 Shallow Concentrated Flow, Woodland Kv=5.0 fps 6.5 250 0.0050 0.64 Shallow Concentrated Flow, Cultivated Straight Rows Kv= 9.0 fps ' 10.8 230 0.0050 0.35 Shallow Concentrated Flow, Woodland Kv=5.0 fps 2.3 95 0.0100 0.70 Shallow Concentrated Flow, ' Short Grass Pasture Kv= 7.0 fps 2.3 630 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 43.9 1,455 Total