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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: OFF1-100 NAME: 100yr-Offsite Basin #1 <br /> SBUH METHODOLOGY <br /> TOTAL AREA • 3.30 Acres BASEFLOWS: 0.00 cfs <br /> RAINFALL TYPE TYPE1A 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 - 24.98 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 />