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<br />KAISER STEEL CORPORATION <br />COLORADO COAL MINE LtlIPANY <br />CWNTY ROAD DRY CROSSI MG <br />DITCH AND RIPRAP SIZING <br />TABLE 1 (CONY) <br />CALNLATE SAFETY FACTOR FOR BOTTOM OF CXANNEL <br />SF SAFETY FACTOR <br />SF = COS AL ' TAM AR/SIN AC +NB•i AN AR <br />SF = 70.22 <br />LNECX STABILITY OF R1P RAP ON SIDE SLOPES <br />CALNLATE T MAX <br />T MAX = .76•G•CS <br />T NAX 0.17 LBS/FT2 <br />NB MAX = (21.7 MAX)/(G•(SG-1)`D50 <br />NB MAX = 0.077 <br />ASSUME UNIFORM FLOP <br />A TAM^-T(1/SIDE SLOPE) <br />SIDE SLOPE 2 :I <br />A= 26.57 <br />B = TAN"-1(COS AC/(2'SIN 'A/NB`TAN AR)+SIN AL) <br />B = 4.08 DEGREES <br />N~ = NB MAX`((1+SIN(AL+B))/2) <br />N~ = 0.038 <br />SF = (COS A` TAN AA)/((N~'TAN AR)+(SIN A•TAN B)) <br />SF = 1.68 FS > 1 THEREFORE RI PRAP IS STABLE <br />PAGE 3 <br />