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11 <br />^I <br />Offsite <br />=&kOS 12/27/02 3:8:51 <br />pm Perteet Engineering, <br />Inc <br />page 1 <br />-I <br />Silver Lake Elementary <br />Preliminary Drainage <br />Design <br />Offsite Basin Hydrology <br />BASIN SUMMARY <br />BASIN 1D: OFF1-100 <br />NAME: 100yr-Of-`site Basin <br />N1 <br />SBUH METHODOLOGY <br />TOTAL AREA.......: <br />3.30 Acres BASEFLOWS: <br />0.00 efs <br />RAINFALL TYPE....: <br />TYPEIA <br />PERV <br />IMP <br />PRECIPITATION....: <br />3.20 inches AREA..: <br />2.30 Acres <br />1.00 Acres <br />TIME INTERVAL..... <br />10.00 min CN....: <br />86.00 <br />98.00 <br />TC....: <br />24.98 min <br />5.00 min <br />ABSTRACTION COEFF: <br />0.20 <br />TcReach - Sheet L: <br />200.00 ns:0.1500 p2yr: 1.70 <br />s:0.0170 <br />PEAK RATE: 1.37 c£s <br />VOL: 0.60 Ac-£t TIME: <br />4BO min <br />Page 1 <br />