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N <br />0 <br />i <br />z <br />e <br />W <br />N <br />N <br />0. <br />O <br />rn <br /> <br />SENECA II WEST MINE <br />POST-MINE DRAINAGE CHANNEL SUMMARY <br />Channel Design <br />Flow <br />(cfs) Channel <br />Shape Side- <br />slopes <br />(H:V) Minimum <br />Channel <br />Slope <br />(°/a) Maximum <br />Channel <br />Slope <br />(%) Velocity <br />(fps) Flow <br />Depth <br />(ft) Free- <br />board <br />(ft) Total <br />Depth <br />(ft) Riprap <br />(Dyo) <br />(in) <br />NEI PP-ll 62 V-Ditch 3:1 IS 22 4.91 0.3 0.3 0.6 N/A <br /> V-Ditch 3:1 23 30 4.45 0.3 0.3 0.6 3 <br />NEI JJ-PP 2.08 V-Ditch 3:1 4 10 4.96 0.5 0.3 0.8 N(A <br /> V-Ditch 3:1 II IS 4.56 0.5 0.3 0.8 3 <br />NEI BB-1J 4.92 V-Ditch 3:1 5 IS 5.37 0.7 0.3 1.0 3 <br />NE2 2.6 V-Ditch 3:1 6 8 4.82 0.5 0.3 0.8 N/A <br /> 2.6 V-Ditch 3:1 9 25 5.2 0.5 0.3 0.8 3 <br /> 2.6 V-Ditch 3:1 26 39 6.36 0.5 0.3 0.8 6 <br />NE 3 1.33 V-Ditch 3:1 5 13 4.88 0.4 0.3 0.7 N/A <br />NE 4 0.62 V-Ditch 3:1 3 I S 4.29 0.3 0.3 0.6 N/A <br />Notes: 1) Velocity is determined using the maximum slope <br />2) Riprap size based on maximum slope <br />3) Flow depth is determined using the minimum slope <br />4) Maximum velocity for unlined channels 5 fps <br />• <br />