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Subject SOIL LOSS CALCULATIDNS~ <br />11 Clnnrc RPlnw Yarr1 <br />•ubbard Canyon Ventilation Facilities Nc. 2 <br />Somerset Coai Mine <br />SOIL LOSS CALCULATION TABLE Reference <br />Formula: A= R K C L 5= Tons/year/Acre <br />Therefore Atpy = Ac R K CL S = Tons/year <br />CALCULATION NOTES <br />gy MOA <br />Checked <br />Acct <br />Jul v 15 19g]_ <br />Sheet No. 3 of 4 Sheets <br />"Predicting Rainfall Erosion Losses " <br />Agriculture Handbook No. 537 <br />x 2000 = Cubic-ft./y r. <br />Soil Wt. <br />Average soil weight = 95 lbs./cu. ft. 2000 = 21,0526 <br />S5 <br />IRREGULAR SLOPE-LENGTH ADJUSTMENT (Agr. H.B. 1(537, pg. 15-16) <br />TYPE: Convex C and Concave CC) Slopes <br />Y = Percent Slope. L = Slope Length <br />LST - Tabulated Figure for Percent Slope to Length (Sum of L for irregular slopes) Table <br />8 Pg. 12. <br />Fac = Factor from Table 4, Pg. 15. (Note convex or• concave slopes) <br /> <br />TABLE <br />SOIL LOSS CALCULATIONS <br /> rre ular Slo e-Len th d ustment LS Soil Loss Yr. <br />~ea Acres R K C Type L LST ~ ac.lLS Adj ~ Tons Cu. t. Area <br />~ 38 .28 1 ~ - ~ ~ <br />2 .2330 38 .2° 1 i .28 190 ' ' ~ .18 0 44 <br />3 .2870 38 .28 1 .80 110 X0.118 0.360 7.59 3 <br />Totals .7357 s ' ; ~ ' 27.8 otal <br /> t <br /> <br /> , <br /> i <br /> <br /> ~ r <br />Calculation Oata <br />-' R = 38 (Fig. 1 , avg. annual volume of the rain fall erosion index.) <br />K = 0.28, C = 1, LS = (1) 100' @ 2.27"' = 0.224 Acres 0. 2157 <br />(2) 190' @ 1.28% _ (1.180 Acres = 0. 2330 <br />(3) 110' @ 0.80w = 0.118 Acres = 0. 2810 <br />Revegetation will occur on the scope and will reduce the volume of sedimentation. <br />