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HomeMy WebLinkAboutApplication Files_82693_pg0742 72189 PR Type 1/124-hr 25-Year Storm Rainfall=5.50" Prepared by{enter your company name here} Printed 7/26/2011 HydroCAD®9 10 s/n 01237 ©2009 HydroCAD Software Solutions LLC Page 65 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) ' 5.1 50 0.1800 0.16 Sheet Flow, A-B Wood's: Light underbrush n= 0.400 P2= 3.20" 3.3 180 0.0333 0.91 Shallow Concentrated Flow, B-C Woodland Kv=5.0 fps 2.4 80 0.0125 0.56 Shallow Concentrated Flow, C-D Woodland Kv= 5.0 fps 0.0 10 0.20.00 6.71 Shallow Concentrated Flow, D-E Grassed Waterway Kv= 15.0 fps 1.4 160 0.0156 1.87 Shallow Concentrated Flow, E-F ' Grassed Waterway Kv= 15.0 fps 12.2 480 Total Summary for Subcatchment PR4D: Ellington Road Access - Entrance ' Runoff = 2.68 cfs @ 12.09 hrs, Volume= 0.194 af, Depth= 2.77" Runoff by SCS TR-20 method, UH=SCS, Time Span=0.00-72.00 hrs, dt=0.05 hrs Type III 24-hr 25-Year Storm Rainfall=5.50" Area (sf) CN Description 10,711 98 Impervious 18,061 69 50-75% Grass cover, Fair, HSG B 3,341 49 50-75% Grass cover, Fair, HSG A 3,700 61 >75% Grass cover, Good, HSG B 838 39 >75% Grass cover, Good, HSG A 36,651 74 Weighted Average 25,940 70.786/6 Pervious Area 10,711 29.22% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Min. Tc=6.0 Summary for Reach R40: Water Quality Swale 1 [801 Warning: Exceeded Pond PR4E by 1.00' @ 0.00 hrs (2.38 cfs 13.883 of Inflow Area = 0.841 ac, 29.22% Impervious, Inflow Depth = 0.94" for 25-Year Storm event Inflow - 2.40 cfs @ 12.10 hrs, Volume= 0.066 of Outflow = 2.24 cfs @ 12.11 hrs, Volume= 0.066 af, Atten= 7%, Lag=0.7 min Routing by Dyn-Stor-Ind method,Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Max.Velocity-- 1.80 fps, Min. Travel Time= 0.9 min Avg.Velocity= 0.76 fps, Avg. Travel Time= 2.2 min Peak Storage= 124 cf @ 12.11 hrs Average Depth at Peak Storage= 0.15' Bank-Full Depth= 1.00', Capacity at Bank-Full=62.31 cfs