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10/24/96 page 1 SANBORN CREEK MINE COAL WASTE BANK DESIGN 2.0-INCH 10 YEAR, 24 HOUR STORM EVENT ee~e~~ee~aae-ase~==geese=eee=ee~e=~e=eeea~=e~~~^veavev~ee~ee~-= BASIN SUMMARY \J BASIN ID: Al SCS METHODOLOGY TOTAL AREA........ RAINFALL TYPE....: PRECIPITATION....: TIME INTERVAL....: NAME: EAST NAT DRAINAGE ABOVE PILE 1.56 Acres TYPE2 2.00 inches 5.00 min BASEFLOWS: AREA... CN..... TC..... 0.00 cfs PERV 1.56 Acres 63.00 2.00 min ABSTRACTION COEFF: 0.20 TcReach - Shallow L: 340.00 ks:5.00 s:0.6500 PEAK RATE: 0.03 cfs VOL: 0.01 Ac-ft TIME: 740 min BASIN ID: Ala SCS METHODOLOGY TOTAL AREA........ RAINFALL TYPE....: PRECIPITATION....: TIME INTERVAL....: NAME: NAT DRAINAGE ABOVE PILE 0.83 Acres TYPE2 2.00 inches 5.00 min BASEFLOWS: AREA... CN..... TC..... 0.00 cfs PERV 0.83 Acres 63.00 2.55 min ABSTRACTION COEFF: 0.20 TcReach - Shallow L: 350.00 ks:5.00 s:0.6300 TcReach - Channel L: 390.00 kc:10.00 s:0.3600 PEAK RATE: 0.02 cfs VOL: 0.01 Ac-ft TIME: HASIN ID: Alb SCS METHODOLOGY TOTAL AREA.. ..... RAINFALL TYPE....: PRECIPITATION....: TIME INTERVAL....: BASEFLOWS: AREA... CN..... TC..... 740 min 0.00 cfs PERV 1.29 Acres 63.00 2.55 min ABSTRACTION COEFF: 0.20 TcReach - Shallow L: 350.00 ks:5.00 s:0.6300 TcReach - Channel L: 390.00 kc:10.00 x:0.3600 PEAK RATE: 0.03 CPs VOL: 0.01 Ac-ft TIME: NAME: NAT DRAINAGE ABOVE PILE 1.29 Acres TYPE2 2.00 inches 5.00 min 740 min IMP 0.00 Acres 0.00 0.00 min zMP 0.00 Acres 0.00 0.00 min IMP 0.00 Acres 0.00 0.00 min •