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Existing Twin Lakes West-Prelim. Subdivision Typell24-hrNURP Rainfa/1=2.50" <br />Prepared by RLK Incorporated Page 23 <br />HydroCADO 7.00 s/n 000754 O 1986-2003 Appiied Microcomputer Systems 10/6/2006 <br />Area ( ac) CN Description <br />24.570 82 Woods/grass comb., Poor, HSG C <br />10.340 98 Lake Surface ( NWL) <br />34.910 87 Weighted Average <br />Tc Length Slope Velocity Capacity Description <br />( min) ( fee� ( ft/fU ( ft/sec) ( cfs) <br />36.4 252 0.0400 0.1 Sheet Flow, <br />Woods: Light underbrush n= 0.400 P2= 2.80" <br />34.0 102 0.0001 0.1 Shallow Concentrated Flow, <br />Woodland Kv= 5.0 fps <br />0.9 165 0.0020 3.2 10.12 Circular Channel ( pipe) , <br />Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.013 <br />0.8 69 0.0800 1.4 Shallow Concentrated Flow, <br />Woodland Kv= 5.0 fps <br />72.1 588 Total <br />Subcatchment OFF: Off-Site to Cleveland Ave. <br />Runoff = 17.41 cfs @ 12.27 hrs, Volume= 1.755 af, Depth= 1.69" <br />Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs <br />Type II 24-hr NURP Rainfa11=2.50" <br />Area ( ac� CN Description <br />2.040 74 >75% Grass cover, Good, HSG C <br />2.200 89 Gravel roads, HSG C <br />8.200 98 Paved parking & roofs <br />12.440 92 Weighted Average <br />Tc Length Slope Velocity Capacity Description <br />( min) ( fee� ( ft/fU ( ft/sec) ( cfs) <br />10.3 214 0.0105 0.3 Sheet Flow, <br />Fallow n= 0.050 P2= 2.80" <br />17.8 79 0.0085 0.1 Sheet Flow, <br />Grass: Dense n= 0.240 P2= 2.80" <br />0.8 126 0.0150 2.5 Shallow Concentrated Flow, <br />Paved Kv= 20.3 fps <br />0.1 26 0.2330 7.2 Shallow ConcenVated Flow, <br />Grassed Waterway Kv= 15.0 fps <br />2.5 359 0.0143 2.4 Shallow Concentrated Flow, <br />Paved Kv= 20.3 fps <br />0.7 107 0.0300 2.6 Shallow Concentrated Flow, <br />Grassed Waterway Kv= 15.0 fps <br />32.2 911 Total <br />