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<br />Table 11. Soil loss and sediment yield calculations for drainages at the Eckman Park Mine. <br /> <br /> <br />Basin Average <br />Slope <br />Length Average <br />Slope <br />Gradient <br />Topographic <br />Factor <br />Soil Loss <br />(tons/ac/yr.) Drainage <br />Area <br />(ac.) Sediment <br />Delivery <br />Ratio Sediment <br />Yield <br />(tons/yr) <br />Approved 1005 19.5 17 2.76 73 .43 87 <br />Area 41 <br />Existing 1075 16.9 13.3 2.16 107 .40 92 <br />Approved 1050 15.3 10.8 1.76 334 .33 194 <br />31-1 (51W) <br />Existing 900 14,6 9.4 1.53 366 .32 179 <br />Approved 2040 17.3 19.8 3.22 168 .37 200 <br />7-1 (S1W) <br />Existing 850 15.9 10.4 1.69 211 .35 125 <br />Approved 1640 13.8 12.1 1.97 270 .34 181 <br />7-2 (51W) <br />Existing 950 13.7 9.0 1.46 267 .34 133 <br />Approved 1360 12.9 9.9 1.61 311 .33 165 <br />9/10-1 (S1E) <br />Existing 1460 12.7 10.5 1.71 398 .32 218 <br />Approved 1675 14.6 13.0 2.11 269 .34 193 <br />9/10-2 (51E) <br />Existing 1110 17.2 13.5 2.19 255 .34 190 <br />Rainfall-runoff factor (R) 30 <br />Soil erodibility factor (K) _ .28 <br />Cover management factor (C) _ .043 <br />Erosion Control practive factor (P) _ .45 <br />