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Existing Twin Lakes West-Prelim. Subdivision Type 1124-hrNURP Rainfall=2.50" Prepared by RLK Incorporated Page 18 HydroCADO 7.00 s/n 000754 O 1986-2003 Applied Microcomputer Systems 10/6/2006 Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 35W-5: Northwest Portion to wlson Pond Subcatchment CLEV: West Portion to Cleveland Ave. Runoff Area=14.960 ac Runoff Depth=0.79" Flow Length=858' Tc=19.7 min CN=78 Runoff=12.48 cfs 0.982 af Runoff Area=6.380 ac Runoff Depth=1.61" Flow Length=669' Tc=21.1 min CN=91 Runoff=11.03 cfs 0.856 af Subcatchment LL-1 ( q : Eastem Portion to Langton Lake Runoff Area=9.410 ac Runoff Depth=0.94" Flow Length=667' Tc=17.2 min CN=81 Runoff=10.49 cfs 0.739 af SubCatChment LL-1 ( S'� : Southem Portion to Langton Lake Runoff Area=3.450 ac Runoff Depth=2.16" Flow Length=774' Tc=9.8 min CN=97 Runoff=10.50 ds 0.622 af SubCetChment LL-1 ( Sq : Southeast Portion of l.angton Lake Drainage Area Runoff Area=26.68o ac Runoff Depth=1.45" Flow Length=1,471' Tc=13.9 min CN=89 Runoff=52.10 cfs 3.234 af Subcatchment LL-1 ( SWj : Southwest Portion to Langton Lake Runoff Area=12.090 ac Runoff Depth=1.96" Flow Length=1,596' Tc=30.7 min CN=95 Runoff=19.82 ds 1.978 af Subcatchmerrt LL-1 ( Wj : Westem Portion to Langton Lake Runoff Area=7.690 ac Runoff Depth=1.61" Flow Length=649' Tc=32.4 min CN=91 Runoff=10.22 cfs 1.032 af Subcatchment LL.: Area Surrounding Langton Lake ( SoutF� Runoff Area=34.910 ac Runoff Depth=1.31" Flow Length=588' Tc=72.1 min CN=87 Runoff=21.16 cfs 3.814 af SubcatchmeM OFF: Off-Site to Cleveland Ave. Reach 1 R: Total to Cleveland Runoff Area=12.440 ac Runoff Depth=1.69" Flow Length=911' Tc=32.2 min CN=92 Runoff=17.41 cfs 1.755 af Inflow=26.81 cfs 2.611 af Outflow=26.81 cfs 2.611 af POnd CIIY: E�tisting City StoRnwater Pond Peak EIev=907.61' Storage=165,755 cf Inflow=61.98 ds 3.973 af Primary=3.93 cis 3.141 af Secondary=11.94 cfs 0.734 af Outflow=15.87 ds 3.875 af Pond LL: Langton Lake ( Soutt� Peak EIev=906.11' Storage=9.355 af Inflow=56.48 ds 11.322 af 24.0" x 38.0' Culvert Outflow=1.93 cfs 4.285 af Total Runoff Area = 128.010 ac Runoff Volume = 15.013 af Average Runoff Depth = 1.41"