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Existing Twin Lakes West-Prelim. Subdivision Type /124-hrNURP Rainfall=2.50" Prepared by RLK Incorporated Page 25 HydroCAD� 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� 020 0.40 0.60 0.80 1.00 1.20 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=3.93 cFs @ 12.36 hrs HW=907.61' ( Free Discharge) L1=12" RCP ( Inlet Controls 3.93 cfs @ 5.0 fps) �2=Bottom of Wooden Sldmmer ( Passes 3.93 cfs of 181.97 cfs potential flow) 3=Top of Wooden Skimmer ( Controls 0.00 cfs) Secondary OutFlow Max=11.90 cfs @ 12.36 hrs HW=907.61' ( Free Discharge) L4=Rip-rap Overflow ( Weir Controls 11.90 cfs @ 1.6 fps) Pond LL: Langton Lake ( South) Inflow Area = 94.230 ac, Inflow Depth = 1.44" for NURP event Inflow = 56.48 cfs @ 12.32 hrs, Volume= 11.322 af Outflow = 1.93 cfs @ 24.69 hrs, Volume= 4.285 af, Atten= 97%, Lag= 741.8 min Primary = 1.93 cfs @ 24.69 hrs, Volume= 4.285 af Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 906.11' @ 24.69 hrs Surf.Area= 11.069 ac Storage= 9.355 af Plug-Flow detention time= 1,068.4 min calculated for 4.284 af ( 38% of inflow) Center-of-Mass det. time= 863.7 min ( 1,792.0 - 928.3 ) # 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-fee� ( acre-feeA 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=1.93 cfs @ 24.69 hrs HW=906.11' ( Free Discharge) t-1=28" CMP Span ( Barrel Controls 1.93 cfs @ 2.4 fps)