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Existing Twin Lakes West-Prelim. Subdivision Type //24-hr 1 y� Rainfall-2.30" Prepared by RLK Incorporated Page 6 HydroCADO 7.00 s/n 000754 O 1986-2003 Applied Microcomputer Systems 10/6/2006 Tc Length Slope Velocity Capacity Description ( min) ( feep ( ft/fU ( ft/sec) ( cfs) 21.3 300 0.0034 0.2 Sheet Flow, Fallow n= 0.050 P2= 2.80" 4.0 414 0.0115 1.7 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.6 128 0.0351 3.8 Shallow Concentrated Flow, Paved Kv= 20.3 fps 2.9 261 0.0055 1.5 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.9 493 0.0020 4.2 29.83 Circular Channel ( pipe) , Diam= 36.0" Area= 7.1 sf Perim= 9.4' r= 0.75' n= 0.013 30.7 1,596 Total Subcatchment LL-1 ( VIQ : Westem Portion to Langton Lake Runoff = 9.08 cfs @ 12.27 hrs, Volume= 0.916 af, Depth= 1.43" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 1-yr Rainfa11=2.30" Area ( ac) CN Description 0.150 61 >75% Grass cover, Good, HSG B 0.350 89 Gravel roads, HSG C 1.060 55 Woods, Good, HSG B 6.130 98 Paved parking & roofs 7.690 91 Weighted Average Tc Length Slope Velocity Capacity Description ( min) ( fee� ( fUfU ( ft/sec) ( cfs) 5.0 300 0.0061 1.0 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.80" 1.8 127 0.0035 1.2 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.6 57 0.0910 1.5 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 23.3 70 0.0001 0.1 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 1.2 50 0.0001 0.7 2.26 Circular Channel ( pipe) , Diam= 24.0" Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.013 0.5 45 0.0900 1.5 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 32.4 649 Total Subcatchment LL.: Area Surrounding Langton Lake ( South) Runoff = 18.40 cfs @ 12.81 hrs, Volume= 3.333 af, Depth= 1.15" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Type II 24-hr 1-yr Rainfa11=2.30"