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4/16/97 page 1 <br />West Elk Mine <br />WESTEC Project No. 97009 <br />2.8-inch 100yr-24hr Design Storm <br />BASIN SUMMARY <br />BASIN ID: aE: contributing basin to pond <br />SCS METHODOLOGY <br />TOTALrAREA....... : 9.25 Acres BASEFLOWS: 0.00 cfs <br />RAINFALL TYPE....: TYPE2 PERV <br />PRECIPITATION....: 2.80 inches AREA..: 9.25 Acres <br />TIME INTERVAL....: 10.00 min CN.... : 75.00 <br /> TC.... : 5.66 min <br />ABSTRACTION COEFF: 0.20 <br />TcReach - Shallow L:1086.80 ks:5.00 s:0.4100 <br />PEAK RATE: 9.70 cfs VOL: 0.60 Ac-ft TIME: 730 min <br /> <br /> <br />IMP <br />0.00 Acres <br />0.00 <br />0.00 min <br />