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Existing Twin Lakes West-Prelim. Subdivision Type /124-hr 100-yr Rainfall=5.90" <br />Prepared by RLK Incorporated Page 12 <br />HydroCAD� 7.00 s/n 000754 O 1986-2003 Applied Microcomputer Systems 10/6/2006 <br />Tc Length Slope Velocity Capacity Description <br />( min) ( feeQ ( ft/f� ( ft/sec) ( cfs) <br />16.7 205 0.0673 0.2 Sheet Flow, <br />Grass: Dense n= 0240 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 = 42.87 cfs @ 12.09 hrs, Volume= 2.974 af, Depth= 3.79" <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 100-yr Rainfa11=5.90" <br />Area ( ac) CN Description <br />2.760 39 >75% Grass cover, Good, HSG A <br />6.650 98 Paved parking 8� roofs <br />9.410 81 Weighted Average <br />Tc Length Slope Velocity Capacity Description <br />( min) ( feeU ( ft/fU ( 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 surfaces 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 Conoentrated Flow, <br />Grassed Waterway Kv= 15.0 fps <br />17.2 667 Total <br />Subcatchment LL-1 ( Sj : Southem Portion to Langton Lake <br />Runoff = 25.61 cfs @ 12.01 hrs, Volume= 1.594 af, Depth= 5.54" <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 100-yr Rainfa11=5.90" <br />Area ( ac) CN Description <br />0200 74 >75% Grass cover, Good, HSG C <br />3.250 98 Paved parkinQ & roofs <br />3.450 97 Weighted Average <br />