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Existing Twin Lakes West-Prelim. Subdivision Type l/24-h� 100 yr Rainfall=5.90" Prepared by RLK Incorporated Page 10 HydroCADC� 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 Witson Pond Subcatchment CLEV: West Portion to Cleveland Ave. Runoff Area=14.960 ac Runoff Depth=3.49" Flow Length=858' Tc=19.7 min CN=78 Runoff=58.53 cfs 4.352 af Runoff Area=6.380 ac Runoff Depth=4.86" Flow Length=669' Tc=21.1 min CN=91 Runoff=31.93 cts 2.584 af Subcatchment LL-1 ( q : Eastem Portion to Langton Lake Runoff Area=9.410 ac Runoff Depth=3.79" Flow Length=667' Tc=17.2 min CN=81 Runoff=42.87 cfs 2.974 ai Subcatchment LL-1 ( S'� : Southem Portion to Langton Lake Runoff Area=3_450 ac Runoff Depth=5.54" Flow Length=774' Tc=9.8 min CN=97 Runoff=25.61 cfs 1.594 af Subcatchment LL-1 ( Sq : Southeast Portion of Langton Lake Drainage Area Runoff Area=26.680 ac Runoff Depth=4.64" Flow Length=1,471' Tc=13.9 min CN=89 Runoft=158.61 cfs 10.313 af SubcatChment LL-1 ( SV1� : Southwest Portion to Langton Lake Runoff Area=12.090 ac Runoff Depth=5.31" Flow Length=1,596' Tc=30.7 min CN=95 Runoff=51.09 ds 5.352 af SubCatchment LL-1 ( VIQ : Westem Portion to Langton Lake Runoff Area=7.690 ac Runoff Depth=4.86" Flow Length=649' Tc=32.4 min CN=91 Runoff=29.71 cfs 3.114 af Subcatchment LL.: Area Surrounding Langton Lake ( SoutF� Runoff Area=34.910 ac Runoff Depth=4.42" Flow Length=588' Tc=72.1 min CN=87 Runoff=71.68 cfs 12.863 af Subcatchment OFF: Off�ite to Cleveland Ave. Reach 1R: Total to Cleveland Runoff Area=12.440 ac Runoff Depth=4.97" Flow Length=911' Tc=32.2 min CN=92 Runoff=49.04 cfs 5.153 af Inflow=76.43 cfs 7.737 af Outflow=76.43 cfs 7.737 af Pond CITY: Existing City Stormwater Pond Peak EIev=909.18' Storage=243,646 cf Inflow=200.04 cfs 13287 af Primary=5.74 cfs 5.155 af Secondary=143.96 cfs 8.018 af Outflow=149.70 cfs 13.174 af Pond LL: Langton Lake ( SoutF� Peak EIev=907.52' Storage=25.602 af Inflow=258.78 cfs 36.097 af 24.0" x 38.0' Culvert Outflow=12.21 cfs 23.760 af Totat Runoff Area = 128.010 ac Runoff Volume = 48.299 af Average Runoff Depth = 4.53"