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10/24/96 page 2 <br />SANBORN CREEK MINE <br />COAL WASTE BANK DESIGN <br />• 2.4-INCH 25 YEAR, 24 HOUR STORM EVENT <br />BASIN SUMMARY <br />u <br />BASIN ID: A3 <br />SCS METHODOLOGY <br />TOTAL AREA........ <br />RAINFALL TYPE....: <br />PRECIPITATION....: <br />TIME INTERVAL....: <br />NAME: WEST NAT DRAINAGE ABOVE PILE <br />0.55 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 />0.55 Acres <br />63.00 <br />2.00 min <br />IMP <br />0.00 Acres <br />0.00 <br />0.00 min <br />ABSTRACTION COEFF: 0.20 <br />TcReach - Shallow L: 300.00 ks:5.00 5:0.6200 <br />PEAK RATE: 0.06 cfs VOL: 0.01 Ac-ft TIME: 725 min <br />BASIN ID: A4 <br />SCS METHODOLOGY <br />TOTAL AREA........ <br />RAINFALL TYPE....: <br />PRECIPITATION....: <br />TIME INTERVAL....: <br />NAME: NAT DRAINAGE ABOVE HAUL ROAD <br />2.46 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 />2.46 Acres <br />63.00 <br />3.03 min <br />ABSTRACTION COEFF: 0.20 <br />TcReach - Shallow L: 560.00 ks:5.00 5:0.3800 <br />PEAK RATE: 0.27 cfs VOL: 0.04 Ac-ft TIME: 730 min <br />BASIN ID: Asa <br />SCS METHODOLOGY <br />TOTAL AREA........ <br />RAINFALL TYPE....: <br />PRECIPITATION....: <br />TIME INTERVAL....: <br />0.00 cfs <br />PERV <br />0.25 Acres <br />90.00 <br />2.44 min <br />BASEFLOWS: <br />AREA... <br />CN..... <br />TC..... <br />ABSTRACTION COEFF: 0.20 <br />TcReach - Shallow L: 190.00 ks:13.00 5:0.0100 <br />PEAK RATE: 0.48 cfs VOL: 0.03 Ac-ft TIME: 725 min <br />BASIN ID: A5b <br />SCS METHODOLOGY <br />TOTAL AREA........ <br />RAINFALL TYPE....: <br />PRECIPITATION....: <br />TIME INTERVAL....: <br />NAME: TOP OF COAL WASTE DR TO EAST <br />0.25 Acres <br />TYPE2 <br />2.40 inches <br />5.00 min <br />NAME: TOP OF COAL WASTE DR WEST <br />0.25 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 />0.25 Acres <br />90.00 <br />2.00 min <br />ABSTRACTION COEFF: 0.20 <br />TcReach - Shallow L: 140.00 ks:13.00 5:0.0100 <br />PEAK RATE: 0.48 cfs VOL: 0.03 Ac-ft TIME: 725 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 />• <br />