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HomeMy WebLinkAboutApplication Files_82693_pg0707 72189 PR Type 11124-hr 10-Year Storm Rainfall=4.70" Prepared by{enter your company name here} Printed 7/26/2011 HydroCAD®9.10 s/n 01237 ©2009 HydroCAD Software Solutions LLC Page 31 Summary for Subcatchment PRIA. Area Around Biofiitration Basin 5 Runoff - -3.07 ofs 12.10 hrs, Volume= 0.234 af, Depth= 1.53" Runoff by SCS TR-20 method, UH=SCS, Time Span=O.Ob-72.00 hrs, dt= 0.05 hrs Type 111.24-hr 10-Year Storm Rainfall=4.70" _ Area (sf) CN Description * 27,712 98 Impervious 2,003 36 Woods, Fair, HSG A 2,900 35 Brush, Fair, HSG A * 9,829 98 Water 37,645 39 >75% Grass cover, Good, HSG A 80,089 66 Weighted Average 42,548 53.13% Pervious Area 37,541 46.87% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.3 50 0.0400 0.20 Sheet Flow, A-13 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 PRI B: Ellington Road Access Drive & Existing Depression Runoff = 3.47 cfs @ 12.10 hrs, Volume= 0.260 af, Depth= 1.67" Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-72.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Storm Rainfall=4.70" Area (sf) CN Description 15,224 98 Impervious * 11,264 98 Water Surface 25,385 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 81,396 68 Weighted Average 54,908 67.46% Pervious Area 26,488 32.54% Impervious Area Tc Length Slope Velocity Capacity Description (min) {feet) (ft/ft) ec) (cfs) 6.0 Direct Entry, Min.Tc=6.0