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10/24/96 page 2 SANBORN CREEK MINE COAL WASTE BANK DESIGN 2.0-INCH 10 YEAR, 24 HOUR STORM EVENT -------- --------------------------------------- BASIN SUMMARY BASIN ID: A3 SCS METHODOLOGY TOTAL AREA........ RAINFALL TYPE....: PRECIPITATION....: TIME INTERVAL....: NAME: WEST NAT DRAINAGE ABOVE PILE 0.55 Acres TYPE2 2.00 inches 5.00 min BASEFLOWS: AREA... CN..... 0.00 cfs PERV 0.55 Acres 63.00 2.00 min IMP 0.00 Acres 0.00 0.00 min TC..... • ABSTRACTION COEFF: 0.20 TcReach - Shallow L: 300.00 ks:5.00 s:0.6200 PEAK RATE: 0.01 cfs VOL: 0.00 Ac-ft TIME: 740 min BASIN ID: A4 SCS METHODOLOGY TOTAL AREA........ RAINFALL TYPE....: PRECIPITATION....: TIME INTERVAL....: NAME: NAT DRAINAGE ABOVE HAUL ROAD 2.46 Acres TYPE2 2.00 inches 5.00 min BASEFLOWS: AREA... CN..... TC..... 0.00 cfs PERV 2.46 Acres 63.00 3.03 min IMP 0.00 Acres 0.00 0.00 min ABSTRACTION COEFF: 0.20 TcReach - Shallow L: 560.00 ks:5.00 s:0.3800 PEAK RATE: 0.05 cfs VOL: 0.02 Ac-ft TIME: 745 min BASIN ID: Asa SCS METHODOLOGY TOTAL AREA........ RAINFALL TYPE....: PRECIPITATION....: TIME INTERVAL....: NAME: TOP OF COAL WASTE DR TO EAST 0.25 Acres TYPE2 2.00 inches 5.00 min BASEFLOWS: AREA... CN..... TC..... 0.00 cfs PERV 0.25 Acres 90.00 2.44 min IMP 0.00 Acres 0.00 0.00 min ABSTRACTION COEFF: 0.20 TcReach - Shallow L: 190.00 ks:13.00 s:0.0100 PEAK RATE: 0.36 cfs VOL: 0.02 Ac-ft TIME: 725 min BASIN ID: ASb SCS METHODOLOGY TOTAL AREA........ RAINFALL TYPE....: PRECIPITATION....: TIME INTERVAL....: NAME: TOP OF COAL WASTE DR WEST 0.25 Acres TYPE2 2.00 inches 5.00 min BASEFLOWS: AREA... CN..... 0.00 cfs PERV 0.25 Acres 90.00 2.00 min IMP 0.00 Acres 0.00 0.00 min TC..... ABSTRACTION COEFF: 0.20 TcReach - Shallow L: 140.00 ks:13.00 x:0.0100 PEAK RATE: 0.36 cfs VOL: 0.02 Ac-ft TIME: 725 min •