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Existing Twin Lakes West-Prelim. Subdivision Type /124-h�NURP Rainfa/1=2.50" <br />Prepared by RLK Incorporated Page 21 <br />HydroCADC� 7.00 s/n 000754 O 1986-2003 Applied Microcomputer Systems 10/6/2006 <br />Tc Length Slope Velocity Capacity Description <br />( min) ( feeU ( ft/fU ( ft/sec) ( cfs) <br />4.9 300 0.0065 1.0 Sheet Flow, <br />Smooth surfaces n= 0.011 P2= 2.80" <br />3.6 382 0.0075 1.8 Shallow Conoentrated Flow, <br />Paved Kv= 20.3 fps <br />1.3 92 0.0526 1.1 Shallow Concentrated Flow, <br />Woodland Kv= 5.0 f�s <br />9.8 774 Total <br />Subcatchment LL-1 ( Sq : Southeast Portion of Langton Lake Drainage Area <br />Runoff = 52.10 cfs @ 12.06 hrs, Volume= 3.234 af, Depth= 1.45" <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 />0.300 74 >75% Grass cover, Good, HSG C <br />0.270 89 Gravel roads, HSG C <br />2.080 98 Paved parking & roofs <br />24.030 88 Industrial ( oer OSM Drainaae Studv) <br />26.680 89 Weighted Average <br />Tc Length Slope Velocity Capacity Description <br />( min) ( fee� ( ft/f� ( ft/sec) ( cfs) <br />3.8 55 0.2000 0.2 Sheet Flow, <br />Grass: Dense n= 0.240 P2= 2.80" <br />4.6 247 0.0050 0.9 Sheet Flow, <br />Smooth surfaces n= 0.011 P2= 2.80" <br />0.9 77 0.0050 1.4 Shallow Concentrated Flow, <br />Paved Kv= 20.3 fps <br />4.6 1,092 0.0030 3.9 12.39 Circular Channel ( pipe) , <br />Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.013 <br />13.9 1,471 Total <br />Subcatchment LL-1 ( SV1� : Southwest Portion to Langton Lake <br />Runoff = 19.82 cfs @ 12.24 hrs, Volume= 1.978 af, Depth= 1.96" <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 />0.340 74 >75% Grass cover, Good, HSG C <br />2.720 89 Gravel roads, HSG C <br />9.030 98 Paved parking & roofs <br />12.090 95 Weighted Average <br />