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1 <br />i <br />Offsite <br />,::&kOS 12/27/02 3:8:51 pm Perteet Engineering, Inc page 1 <br />Silver Lake Elementary <br />Preliminary Drainage Design <br />Offsite Basin Hydrology <br />BASIN SUMMARY <br />BASIN ID: OFFl-100 NAME: 100yr-Of£site Basin #1 <br />SBUH METHODOLOGY <br />TOTAL AREA.......: 3.30 Acres BASEFLOWS: 0.00 cfs <br />RAINFALL TYPE....: TYPEIA PERV IMP <br />PRECIPITATION....: 3.20 inches AREA..: 2.30 Acres 1.00 Acres <br />TIME INTERVAL....: 10.00 min CN.... : 86.00 98.00 <br />TC..... 24.9E min 5.00 min <br />ABSTRACTION COEFF: 0.20 <br />TcReach - Sheet L: 200.00 ns:0.1500 p2yr: 1,70 s:0.0170 <br />PEAK RATE: 1.37 cfs VOL: 0.60 Ac-ft TIME: 480 min <br />Page 1 <br />