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Existing Twin Lakes West-Prelim. Subdivision Type //24-h� 100 yr Rainfa/1=5.90" Prepared by RLK Incorporated Page 17 HydroCADO 7.00 s/n 000754 �O 1986-2003 Applied Microcomputer Systems 10/6/2006 # Routing Invert Outlet Devices 1 Primary 905.44' 12.0" x 34.0' long 12" RCP RCP, mitered to conform to fill, Ke= 0.700 Outlet Invert= 905.72' S= -0.0082 '/' n= 0.013 Cc= 0.900 2 Device 1 905.44' 5.00' x 5.50' Horiz. Bottom of Wooden Skimmer Limited to weir flow C= 0.600 3 Device 1 907.70' 6.00' x 10.00' Horiz. Top of Wooden Skimmer Limited to weir flow C= 0.600 4 Secondary 907.23' 20.0' long x 10.0' breadth Rip-rap Overflow Head ( fee� 0.20 0.40 0.60 0.80 1.00 120 1.40 1.60 Coef. ( English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Primary OutFlow Max=5.74 cfs @ 12.15 hrs HW=909.18' ( Free Discharge) L1=12' RCP ( Inlet Controls 5.74 cfs @ 7.3 fps) �2=Bottom of Wooden Skimmer ( Passes < 246.33 cfs potential flow) 3=Top of Wooden Skimmer ( Passes < 188.56 cfs potential flow) Seoondary OutFlow Max=143.87 cfs @ 12.15 hrs HW=909.18' ( Free Discharge) t4=Rip-rap Overflow ( Weir Controls 143.87 cfs @ 3.7 fps) Pond LL: Langton Lake ( South) Inflow Area = 94.230 ac, Inflow Depth = 4.60" for 100-yr event Inflow = 258.78 cfs @ 12.18 hrs, Volume= 36.097 af Outflow = 12.21 cfs @ 17.04 hrs, Volume= 23.760 af, Atten= 95%, Lag= 291.8 min Primary = 1221 cfs @ 17.04 hrs, Volume= 23.760 af Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 907.52' @ 17.04 hrs Surf.Area= 12.328 ac Storage= 25.602 af Plug-Flow detention time= 867.6 min calculated for 23.755 af ( 66% of inflow) Center-of-Mass det. time= 736.4 min ( 1,594.6 - 858.2 ) # Invert Avail.Storage Storage Description 1 905.30' 31.192 af Custom Stage Data ( Prismatic,� Listed below Elevation Surf.Area Inc.Store Cum.Store ( fee� ( acres) ( acre-feet� ( acre-fee� 905.30 10.344 0.000 0.000 908.00 12.761 31.192 31.192 # Routing Invert Outlet Devices 1 Primary 905.30' 24.0" x 38.0' long 28" CMP Span CMP, end-section conforming to fill, Ke= 0.500 Outlet Invert= 905.30' S= 0.0000 '/' n= 0.013 Cc= 0.900 Primary OutFlow Max=12.21 cfs @ 17.04 hrs HW=907.52' ( Free Discharge) t1=28" CMP Span ( Barrel Controls 12.21 cfs @ 4.4 fps)