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Existing Twin Lakes West-Prelim. Subdivision Type l/24-hr 1 y� Rainfa/1--2.30" <br />Prepared by RLK Incorporated Page 4 <br />HydroCAD� 7.00 s/n 000754 O 1986-2003 Appiied Microcomputer Systems 10/6/2006 <br />Tc Length Slope Velocity Capacity Description <br />( min) ( fee� ( ft/f� ( ft/sec) ( cfs) <br />16.7 205 0.0673 02 Sheet Flow, <br />Grass: Dense n= 0.240 P2= 2.80" <br />0.7 119 0.0170 2.6 Shallow Concentrated Flow, <br />Paved Kv= 20.3 fps <br />3.3 287 0.0052 1.5 Shallow Concentrated Flow, <br />Paved Kv= 20.3 fps <br />0.4 58 0.0329 2.7 Shallow Concentrated Flow, <br />Grassed Waterway Kv= 15.0 fps <br />21.1 669 Total <br />Subcatchment LL-1 ( q: Eastem Portion to Langton Lake <br />Runoff = 8.84 cfs @ 12.10 hrs, Volume= 0.629 af, Depth= 0.80" <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 1-yr Rainfa11=2.30" <br />Area ( ac) CN Description <br />2.760 39 >75% Grass cover, Good, HSG A <br />6.650 98 Paved parking & roofs <br />9.410 81 Weighted Average <br />Tc Length Slope Velocity Capacity Description <br />( min) ( feeU ( ft/f� ( ft/sec) ( cfs) <br />10.9 93 0.0400 0.1 Sheet Flow, <br />Grass: Dense n= 0.240 P2= 2.80" <br />0.8 92 0.0600 2.0 Sheet Flow, <br />Smooth suriaces n= 0.011 P2= 2.80" <br />5.4 461 0.0050 1.4 Shallow Concentrated Flow, <br />Paved Kv= 20.3 fps <br />0.1 21 0.1250 5.3 Shallow Concentrated Flow, <br />Grassed Waterway Kv= 15.0 fps <br />17.2 667 Total <br />Subcatchment LL-1 ( S� : Southem Portion to Langton Lake <br />Runoff = 9.60 cfs @ 12.01 hrs, Volume= 0.565 af, Depth= 1.97" <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 1-yr Rainfa11=2.30" <br />Area ( ac� CN Description <br />0.200 74 >75% Grass cover, Good, HSG C <br />3.250 98 Paved parkin & roofs <br />3.450 97 Weighted Average <br />