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HomeMy WebLinkAboutApplication Files_82693_pg0863 ' 72189 PR Type 111 24-hr 100-Year Storm Rainfall=6.90" Prepared by VHB Printed 3/9/2010 HydroCAD®9.00 s/n 01237 ©2009 HydroCAD Software Solutions LLC Page 4 ' Summary for Subcatchment PR1A: Existing Depression ' Runoff = 0.15 cfs @ 12.36 hrs, Volume= 0.035 af, Depth= 0.47" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Storm Rainfall=6.90" ' Area (sf) CN Description 3,282 39 >75% Grass cover, Good, HSG A 4,631 36 Woods, Fair, HSG A 30,819 35 Brush, Fair, HSG A 38,732 35 Weighted Average 38,732 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.3 50 0.0400 0.20 Sheet Flow, A-B Grass: Short n= 0.150 P2= 3.20" 1.5 135 0.0444 1.47 Shallow Concentrated Flow,B-C ' Short Grass Pasture Kv= 7.0 fps 0.2 Direct Entry, Min Tc=6.0 6.0 185 Total Summary for Subcatchment PR1 B: Ellington Road Access Drive & Existing Depression ' Runoff = 8.72 cfs @ 12.09 hrs, Volume= 0.632 af, Depth= 3.64" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs ' Type III 24-hr 100-Year Storm Rainfall=6.90" Area (sf) CN Description 23,090 98 Impervious 11,264 98 Water Surface 26,916 69 50-75% Grass cover, Fair, HSG B 10,328 35 Brush, Fair, HSG A 8,272 36 Woods, Fair, HSG A 5,258 61 >75% Grass cover, Good, HSG B 5,665 39 >75% Grass cover, Good, HSG A ' 90,793 71 Weighted Average 56,439 62.16% Pervious Area 34,354 37.84% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Min. Tc=6.0