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10/24/96 page i <br />SANBORN CREEK MINE <br />COAL WASTE BANK DESIGN <br />2.4-INCH 25 YEAR, 24 HOUR STORM EVENT <br />BASIN SUMMARY <br />• <br />BASIN ID: Al <br />SCS METHODOLOGY <br />TOTAL AREA........ <br />RAINFALL TYPE....: <br />PRECIPITATION....: <br />TIME INTERVAL....: <br />NAME: EAST NAT DRAINAGE ABOVE PILE <br />1.56 Acres <br />TYPE2 <br />2.40 inches <br />5.00 min <br />BASEFLOWS: <br />AREA... <br />CN..... <br />TC..... <br />0.00 cfs <br />PERV <br />1.56 Acres <br />63.00 <br />2.00 min <br />ABSTRACTION COEFF: 0.20 <br />TcReach - Shallow L: 340.00 ks:5.00 x:0.6500 <br />PEAK RATE: 0.17 cfs VOL: 0.03 Ac-ft TIME: 725 min <br />BASIN ID: Ala <br />SCS METHODOLOGY <br />TOTAL AREA........ <br />RAINFALL TYPE....: <br />PRECIPITATION....: <br />TIME INTERVAL....: <br />NAME: NAT DRAINAGE ABOVE PILE <br />0.83 Acres <br />TYPE2 <br />2.40 inches <br />5.00 min <br />BASEFLOWS: <br />AREA... <br />CN..... <br />TC..... <br />0.00 cfs <br />PERV <br />0.83 Acres <br />63.00 <br />2.55 min <br />ABSTRACTION COEFF: 0.20 <br />TcReach - Shallow L: 350.00 ks:5.00 x:0.6300 <br />TcReach - Channel L: 390.00 kc:10.00 s:0.3600 <br />PEAK RATE: 0.09 cfs VOL: 0.01 Ac-ft TIME: <br />725 min <br />BASIN ID: Alb <br />SCS METHODOLOGY <br />TOTAL AREA........ <br />RAINFALL TYPE....: <br />PRECIPITATION....: <br />TIME INTERVAL....: <br />NAME: NAT DRAINAGE ABOVE PILE <br />1.29 Acres <br />TYPE2 <br />2.40 inches <br />5.00 min <br />BASEFLOWS: <br />AREA... <br />CN..... <br />TC..... <br />0.00 cfs <br />PERV <br />1.29 Acres <br />63.00 <br />2.55 min <br />ABSTRACTION COEFF: 0.20 <br />TcReach - Shallow L: 350.00 ks:5.00 x:0.6300 <br />TcReach - Channel L: 390.00 kc:10.00 x:0.3600 <br />PEAK RATE: 0.14 cfs VOL: 0.02 Ac-ft TIME: <br />730 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 />n <br />LJ <br />