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10/24/96 page 2 SANBORN CREEK MINE COAL WASTB BANK DESIGN 2.0-INCH 10 YEAR, 24 HOUR STORM EVENT BASIN SUMMARY BASIN ZD: A3 NAME: WEST NAT DRAINAGE ABOVE PILE SCS METHODOLOGY TOTAL AREA.......: O.SS Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE....: TYPE2 DERV IMP PRECIPITATION....: 2.00 inchas AREA..: 0.55 Acres 0.00 Acres TINE INTERVAL....: 5.00 min CN....: 63.00 0.00 TC..... 2.00 min 0.00 min ABSTRACTION COEFF: 0.20 TcReach - Shallow L: 300.00 ks:5.00 s:0.6200 PEAK RATE: 0.01 c!s VOL: 0.00 Ac-!t TIME: 740 min BASIN ID: A4 NAME: NAT DRAINAGE ABOVE A11UL ROAD SCS METHODOLOGY TOTAL AREA.......: 2.46 AcreO BASEFLOWS: 0.00 C!8 RAINFALL TYPE....: TYPE2 PERV IMP PRECIPITATION....: 2.00 inches AREA..: 2.46 Acres 0.00 Acres TINS INTERVAL....: 5.00 min CN....: 63.00 0.00 TC....: 3.03 sin 0.00-min ABSTRACTION COEFP: 0.20 TcReach - Shallow L: 560.00 ks:5.00 s:0.3800 ~"" PEAR RATE: 0.05 cfs VOL: 0.02 Ac-!t TIME: 745 min BASIN iD: A5a NAME: TOP OF COAL WASTH DR TO BAST SCS METHODOLOGY TOTAL AREA.......: 0.25 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE....: TYPE2 PERV IMP PRECIPITATION....: 2.00 inches ARFJ1..: 0.25 Acres 0.00 Acres TIME INTERVAL....: 5.00 min CN....: 90.00 0.00 TC....: 2.44 min 0.00 min ABSTRACTION COEFF: 0.20 TcReach - Shallow L: 190.00 ks:13.00 s:0.0100 PEAR RATE: 0.36 c!s VOL: 0.02 Ac-ft TIM$: 72S min BASIN ID: Asb NAME: TOP OF COAL WASTE DR WEST SCS METHODOLOGY TOTAL ARBa.......: 0.25 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE....: TYPE2 PERV IMP PRECIPITATION....: 2.00 inches AREA..: 0.25 Acres 0.00 Acres TINS ZNTEItVAL....: 5.00 min CN....: 90.00 0.00 TC..... 2.0tl min 0.00 min ABSTRACTION COEFF: 0.20 TcReach - Shallow L: 140.00 ks:13.00 s:0.0100 PEAR RATE: 0.36 cfs VOL: 0.02 Ac-!t TIME: 725 min F `.