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6/17/96 page 3 <br />Bowie No. 2 Mine <br />• Coal waste Bank <br />1.8-inch l0-Year, 24-Hour Storm Event <br />-------------------------------------------------------------------- <br />------------------------------------------------------------------- <br />BASIN SUMMARY <br />BASIN ID: ASa <br />SCS METHODOLOGY <br />TOTAL AREA........ <br />RAINFALL TYPE....: <br />PRECIPITATION....: <br />TIME INTERVAL....: <br />NAME: Reclaimed east waste face <br />0.96 Acres <br />TYPE2 <br />1.80 inches <br />5.00 min <br />BASEFLOWS: <br />AREA..: <br />CN..... <br />ABSTRACTION COEFF: 0.20 <br />PEAK RATE: 0.52 cfs VOL: <br />BASIN ID: ASb <br />SCS METHODOLOGY <br />TOTAL AREA........ <br />RAINFALL TYPE....: <br />PRECIPITATION....: <br />TIME INTERVAL....: <br />TC..... <br />0.00 cfs <br />PERV <br />0.96 Acres <br />80.00 <br />2.00 min <br />0.03 Ac-ft TIME: 725 min <br />NAME: Reclaimed west waste face <br />0.81 Acres <br />TYPE2 <br />1.80 inches <br />5.00 min <br />BASEFLOWS: <br />AREA... <br />CN..... <br />ABSTRACTION COEFF: 0.20 <br />PEAK RATE: 0.44 Cfs VOL: <br />• BASIN ID: A6 <br />SCS METHODOLOGY <br />TOTAL AREA........ <br />RAINFALL TYPE....: <br />PRECIPITATION....: <br />TIME INTERVAL....: <br />TC..... <br />0.00 cfs <br />PERV <br />0.81 Acres <br />80.00 <br />2.00 min <br />0.03 Ac-ft TIME: 725 min <br />NAME: UPPER DIVERSION OF COVERFILL <br />19.28 Acres <br />TYPE2 <br />1.80 inches <br />5.00 min <br />BASEFLOWS: <br />AREA... <br />CN..... <br />TC..... <br />0.00 cfs <br />PERV <br />19.28 Acres <br />83.00 <br />8.0o min <br />ABSTRACTION COEFF: 0.20 <br />TcReach - Shallow L:2200.00 ks:11.00 s:0.4700 <br />TcReach - Channel L: 400.00 kc:15.00 s:0.0200 <br />PEAK RATE: 13.74 cfs VOL: 0.88 Ac-ft TIME: 735 min <br />BASIN ID: A7 <br />SCS METHODOLOGY <br />TOTAL AREA........ <br />RAINFALL TYPE....: <br />PRECIPITATION....: <br />TIME INTERVAL....: <br />NAME: 10 PERCENT HAUL ROAD COVERFILL <br />2.75 Acres <br />TYPE2 <br />1.80 inches <br />5.00 min <br />BASEFLOWS <br />AREA... <br />CN..... <br />TC..... <br />ABSTRACTION COEFF: 0.20 <br />TcReach - Shallow L: 800.00 ks:11.00 s:0.3500 <br />TcReach - Channel L: 300.00 kc:20.00 s:0.1000 <br />PEAK RATE: 1.98 Cfs VOL: 0.13 Ac-ft TIME <br />C~ <br />0.00 cfs <br />PERV <br />2.75 Acres <br />83.00 <br />2.84 min <br />730 min <br />IMP <br />0.00 Acres <br />0.00 <br />0.0o min <br />IMP <br />0.00 Acres <br />0.00 <br />0.00 min <br />IMP <br />0.00 Acres <br />0.00 <br />0.00 min <br />IMP <br />0.00 Acres <br />0.00 <br />0.00 min <br />AnopuACr-ot <br />