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CYPRUS ORCHARD VALLEY COAL CORPORATION <br />DRAINAGE DITCH DESIGN SUMMARY:. <br /> <br /> 10-YEAR 10-YEAR 100-YEAR 100-YEAR <br /> SLOPE PEAKFLOW VELOCITY PEAKFLOW VELOCITY <br />SECTION <br />--------- PAGE <br />------ J/8/S <br />------------ (o) <br />--------- (cfs) <br />---------- (fps) <br />----------- (cfs) <br />----------- (fps) <br />---------- <br />F7EST RIDGE WAST E PILE DRAINAGE AREA (REFER TO MAP N0. 8-lA): <br />Y D4 111 6.3 1.09 3.23 2,44 3.96 <br />X D6 112 6.6 4.83 5.01 9.19 5.89 <br />A D8 112 6.6 4.83 6.14 9.19 7.25 <br />B D10 113 50.0 5,64 N/A 11.01 N/A <br />C D12 121 7.4 3.63 5.10 6.64 6.05 <br />D D14 122 7.4 4.85 5.54 9,12 6.60 <br />E D16 114,122 5.0 10.57 5.95 20,28 7.07 <br />F D18 211 50.0 11.33 N/A 22,64 N/A <br />T D20 211 13.0 11.33 N/A 22,64 N/A <br />H D22 311 13.3 14.15 8.66 27,90 10.34 <br />I D24 321 11.4 0,95 4.34 1,84 5.11 <br />EE D26 421 1.5 1.66 2.56 3,32 3.02 <br />AA D28 511 12.6 17.59 5.34 34,69 6.86 <br />JJ D30 512 5.4 19.11 4.44 37,66 5.54 <br />EAST RIDGE WASTE PILE DRAINAGE AREA (REFER TO MAP N0.8-lA): <br />CC D32 121 2.0 1.30 2.69 2,30 3.10 <br />DD D34 111 2.0 1.71 2.87 3,15 3.35 <br />KK D36 221 3.0 1.83 3.40 3,35 3.96 <br />FF D38 311 5.0 6.32 4.84 12,03 5.84 <br />HH D40 312 5.0 6,86 4.76 30,10 7.56 <br />POND 1 DRAINAGE AREA (REFER TO MAP N0. 8-lA): <br />G D42 121 8.6 1.25 3.98 2.35 4.8 <br />• J D44 212 3.0 4.38 2.97 8.77 3.86 <br />,D-i <br />