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Home My WebLink AboutApplication Files_82693_pg0736 72189 PR Type ///24-hr 25-Year Storm Rainfap=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 59 Area (sq CN Description 18,197 56 Brush, Fair, HSG B , 2,778 98 Water Surface 62,774 98 Paved parking 10,808 61 >75%Grass cover, Good HSG B 94,557 86 Weighted Average 29,005 30.67% Pervious Area 65,552 69.33% 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 Subcatchment PR1F: Chapel Road Driveway & Gffsite Abutter Runoff = 16.86 cfs @ 12.17 hrs, Volume= 1.526 af, Depth= 3.94" 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 (so CN Description rt 123,260 98 Impervious 18,176 61 >75%Grass cover, Good, HSG B 61,215 69 50-75% Grass cover, Fair, HSG B ' 202,651 86 Weighted Average 79,391 39.18% Pervious Area 123,260 60.82% Impervious Area ' Tc Length Slope Velocity Capacity Description (min) (feet) . (ft/ft) (ft/sec) (cfs) 5.6 50 0.0200 0.15 Sheet Flow,A-B Grass: Short n=0.150 P2=3.20" 2.5 310 0.0100 2.03 Shallow Concentrated Flow, B-C Paved Kv=20.3 fps 4.7 444 0.0110 1.57 Shallow Concentrated Flow, B-C Grassed Waterway Kv= 15.0 fps 12.8 804 Total Summary for Subcatchment PR1 G: Offsite Abutter Runoff - 9.29 cfs @ 12.10 hrs, Volume= 0.678 af, Depth= 2.50" 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"