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. X si 0)4 • P- 3- <br /> *G. 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: <br /> a. Determine depth of clean sand fill at upslope edge of rock <br /> layer: Separation 1. 3 feet <br /> b. Multiply rock layer width by landslope to determine drop <br /> in elevation; Slope Difference "°°"°"` <br /> .:.F i(oat Rods <br /> - x % = 100 = feet <br /> c. Add depth of clean sand depth of clean sand for Ugloyef d. 1 oue <br /> renct <br /> separation at upslope edge (2a) to depth of rock layer to S Rt dN v <br /> rock depth and the depth of cover to find the total mound DowIts!spe Width <br /> height at upslope edge of rock layer; 1e1 �_ <br /> 1.3 ft+ l ft + 1 ft = 3.3 feet <br /> d. Enter table on page bottom with landslope and upslope <br /> dike ratio. Select dike multiplier of y.0 . <br /> e. Multiply dike multiplier by upslope mound height i <br /> to get upslope dike width: 3.3 x 4,0 = 13 feet u s .-t <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 /> i. Mininmum mound width is the sum of upslope dike <br /> width plus rock layer width plus downslope dike width; <br /> ..::::::;:.::*2::!..-:::•....-:.::.2:*::::::.:-:.. <br /> eft_+_- ft_+.. ft=-_- feet Rock Bed:Width.p . ::..Ups4e...6 eWidth .... :•:;: <br /> j. Subtract the Minimum width G.i from the Absorption <br /> width F.4 to find the Additional Downslope required for . . <br /> Absorption . . . . <br /> u lo Dike Wide;'. ; .. upslope Date Widih.1, <br /> ft- __--ft-- - ------_feet >� t <br /> sk. Add the Additional Downslope required for Absorption : olkWith <br /> to the downslope dike width and recalulate the Total <br /> Mound Width which is is the sum of upslope dike <br /> width plus rock layer width plus downslope dike width <br /> I ft+ /o ft+ )6" ft = L 0 feet 1- Total Length 4SC -101 <br /> 1. Total mound length is the sum of upslope dike width <br /> plus rock layer length plus upslope dike width; <br /> is ft + SS ft + l S ft = q5 feet <br /> Downslope • <br /> Upslope <br /> U slo <br /> 3:1 4:1 5:1 6:1 7:1 3:1 4:1 5:1 6:1 7:1 8:1 <br /> %slope <br /> 0 3.0 4.0 5.0 6.0 7.0 3.0 4.0 5.0 6.0 7.0 8.0 <br /> 1 3.09 4.17 5.26 6.38 7.53 2.91 3.85 4.76 5.66 654 7.41 <br /> 2 3.19 4.35 536 6.82 8.14 2.83 3.70 4.54 5.36 6.14 6.90 <br /> 3 3.30 454 5.88 7.32 8.86 2.75 3.57 4.35 5.08 5.79 6.45 <br /> 4 3.41 4.76 6.25 7.89 9.72 2.68 3.45 4.17 4.84 5.46 6.06 <br /> 5 3.53 5.00 6.67 8.57 10.77 2.61 3.33 4.00 4.62 5.19 5.71 <br /> 6 3.66 5.26 7.14 9.38 12.07 2.54 3.23 3.85 4.41 4.93 5.41 <br /> 7 3.80 556 7.69 10.34 13.73 2.48 3.12 3.70 4.23 4.70 5.13 <br /> 8 3.95 5.88 8.33 1134 15.91 2.42 3.03 357 4.05 4.49 4.88 <br /> 9 4.11 6.25 9.09 13.04 18.92 2.36 2.94 3.45 3.90 4.30 4.65 <br /> 10 4.29 6.67 10.0 15.00 2333 2.31 2.86 3.33 3.75 4.12 4.44 <br /> 11 4.48 7.14 11.11 17.65 30.43 2.26 2.78 3.23 3.61 3.95 4.26 <br /> 12 4.69 7.69 1230 21.43 43.75 2.21 2.70 3.12 3.49 3.80 4.08 <br />