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-6. DOWNSLOPE DIKE WIDTH <br /> 1. If landslope is 2.9 percent or less,basal width includes both the - . <br /> • upslope and downslope dike widths, <br /> 2. Calculate minimum mound size based on geometery: -j <br /> a. Determine depth of clean sand fill at upslope edge of rock <br /> layer: Separation i /, r? feet <br /> b. Multiply rock layer width by landslope to determine drop <br /> in elevation; Slope Difference ""`"" <br /> xi. }- %+ 100= feet <br /> c. Add depth of clean sand depth of clean sand for upl w .6 (21=- _ <br /> separation of upslope edge(2a) to depth of rock layer to_ 1 Ned � <br /> rock depth and the depth of cover to find the total mound `': ,�,,.. ,Y,.a <br /> height at upslope edge of rock layer; .-_,..,. <br /> ), P7 ft+ 1 ft + l ft = 3.'7 feet <br /> d. Enter table on page bottom with landslope and upslope • <br /> . dike,ratio. Select dike multiplier of 1-4- . <br /> e. Multiply dike multiplier by upslope mound height -- <br /> to get upslope dike width: 3. I x y = 1< _ feet <br /> f. Add the depth of slope difference (2b) to the upslope <br /> height to get the downslope height + _ __ feet <br /> g. Enter table on page E-18 with landslope and downslope <br /> dike ratio. Select dike multiplier of . <br /> h. Multiply dike multiplier by downslope mound height <br /> to get downslope dike width: - x .-- = -- feet <br /> ,------ <br /> i. Mininmum mound width is the sum of upslope dike <br /> width plus rock layer width plus downslope dike width; : <br />