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• <br />YAMPA MINING COMPANY <br />HAYDEN GULCH COAL MINE <br />DESIGN CALCULATIONS <br />1979 (YEAR 1) <br />EXPLOSIVES STORAGE AREA <br />Drainage = 2.4 ac - This represents the enclosed area - all other <br />runoff has been diverted. <br />3% slopes are used for the drainage above <br />volume 10 yr = (2.4)(0.86/12) = 0.11 AC-Ft <br />LJ <br />Sediment Volume <br />A=RK (LS) CP <br />R=30 <br />K=0.35 (from mine soil survey) <br />LS=0.44 (400' @ 3Y grade) <br />C=P=1 <br />A = (30) (0.35) (0.44) (1) = 4.62 Tons/AC/yr <br />Converting weight (Tons) to volume (AC-Ft) <br />Vs= Y <br />wx 43,560 <br />And W = WcPc + WmPm + WsPs <br />Vs= Volume of sediment in ~C-Ft <br />W = Bulk density in lbs/ft <br />Y = lbs. of sediment <br />Where Wc, Wm, and W5 are the unit weights of clay, silt, and sand <br />respectively. <br />Pc, Pm, and Ps are the fractions of clay, silt, and sand present. <br />We = 40 <br />Wm = 72 <br />Ws = 97 <br />And estimated <br />Pc = 0.6 <br />Pm = 0.3 <br />Ps = 0.1 <br /> <br />Resevoir normally dry <br /> <br />