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TABLE 20-2 <br />Pre- and Postmine Drainage Channel Summary <br /> <br /> <br />Drainage Section <br />Premine <br />Length <br />Postmine <br />Length Premine <br />Drainage <br />Area Postmine <br />Drainage <br />Area <br />Premine <br />Slope % <br />Postmine <br />Slope % <br />Premine Elev. <br />(Upper) (Lower) <br /> <br />(Upper) <br />Postmine Elev. <br />(Lower) <br />005 Gulch 4,300 3,540 158.4 139.3 12.1 12.1 7,660 7,140 7,660 7,230 <br />005-E1 3,400 2,190 62.4 58.4 12.4 13.5 7,610 7,190 7,560 7,265 <br />006 Gulch 8,500 6,640' 715.8 729.8 8.1 8.7 7,740 7,050 7,680 7,103 <br />006-NE1 4,000 5,200 72.4 104.6 10.8 11.5 7,610 7,180 7,700 7,103 <br />006-NE2-NE3 3,700 3,000 45.6 45.7 14.3 16.0 7,750 7,220 7,700 7,220 <br />006-NE4 -- 1,000 -- 13.0 -- 6.7 -- -- 7,680 7,613 <br />006-E1 3,400 3,070 97.3 100.8 14.7 14.3 7,800 7,300 7,745 7,305 <br />006-E2 -- 1,160 -- 32.9 -- 18.1 -- -- 7,640 7,430 <br />006 SE1 1,650 3,240 25.6 74.8 12.7 8.6 7,360 7,150 7,380 7,103 <br />PM-1 2,640 2,600 49 56.1 21.2 21.7 7,975 7,415 7,980 7,415 <br />PM-2 3,450 2,905 223.7 212.9 14.5 14.8 B,O50 7,550 7,980 7,550 <br />PM-2A 2,950 3,140 109.4 89.8 19.3 15.8 8,095 7,525 8,094 7,600 <br />PM-3 3.220 3,110 89.2 100.8 13.7 13.2 7,980 7,540 7,950 7,540 <br />1To culvert A-1 <br />• 12 • Revised 7~ <br /> <br />