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. G. DOWNSLOPE DIKE WIDTH 1. If landslope is 2.9 percent or less, basal width includes both the upslope and downslope dike widths, 2. Calculate minimum mound size based on geometery: a. Determine depth of clean sand fill at upslope edge of rock layer: Separation z-b feet b. Multiply rock layer width by landslope to determine drop in elevation; Slope Difference • 10 x 2 % 1100 = .Z feet feel Separationc. Add depth of clean sand depth of clean sand for u"s°pekrt - z kel (wfe.e,� separation at upslope edge (2a) to depth of rock layer to "ro N rock depth and the depth of cover to find the total mound Downslope Width 1iLko \_ height at upslope edge of rock layer; -.0 ft + l ft + l ft = y feet d. Enter table on page bottom with landslope and upslope dike ratio. Select dike multiplier of 3 .'? . e. Multiply dike multiplier by upslope mound height to get upslope dike width: 11.0 x 3.r) = 1 S feet f. Add the depth of slope difference (2b) to the upslope height to get the downslope height y .0 + .Z = 4.--L._feet g. Enter table on page E-18 with landslope and downslope dike ratio. Select dike multiplier of U .3 S . h. Multiply dike multiplier by downslope mound height to get downslope dike width: l _-L x I-1..' s = i c' feet • i. Mininmum mound width is the sum of upslope dike width plus rock layer width plus downslope dike width; 1 S ft + /o ft + ft = 4'S feet Rock BedW• dthi6 ' '. PbpeakWldthJ :::. j. Subtract the Minimum width G.i from the Absorption width F.4 to find the Additional Downslope required for • :ia` �Absorption •i::::::•:::•:::•:::•:: : ` ''' '''' ''' '' • Up6bpeakcWidthj ▪.: : c ' :UP6>opeaieWidtJ-t,.'1 ft.- u ft = -iv-s feet k. Add the Additional Downslope required for Absorption P q rP • Do�lope`D a Wi t) . to the downslope dike width and recalulate the Total 1 Mound Width which is is the sum of upslope dike width plus rock layer width plus downslope dike width i ft + /0 ft + 1 e ft = 43 feet l Total Length ce4C iI 1. Total mound length is the sum of upslope dike width plus rock layer length plus upslope dike width; ft + S 5 ft + 1 5 ft = 'XS feet I (e? -i- ss -i- 1tz5/ q ) Downslope Upsiope 3:1 4:1 5:1 6:1 7:1 3:1 4:1 5:1 6:1 7:1 8:1 %slope 0 3.0 4.0 5.0 6.0 7.0 3.0 4.0 5.0 6.0 7.0 8.0 1 3.09 4.17 5.26 6.38 753 2.91 3.85 4.76 5.66 6.54 7.41 -2--------_3.19 -_C 3S� 556 6.82 8.14 2.83 Q3D 454 5.36 6.14 6.90 3 3.30 454 5:88---7.32---8.86 -2.75- 337 4.35 5.08 5.79 6.45 4 3.41 4.76 6.25 7.89 9.72 2.68 3.45 4.17 4.84 5.46 6.06 5 3.53 5.00 6.67 8.57 10.77 2.61 3.33 4.00 4.62 5.19 5.71 i 6 3.66 5.26 7.14 9.38 12.07 254 3.23 3.85 4.41 4.93 5.41 7 3.80 5.56 7.69 10.34 13.73 2.48 3.12 3.70 4.23 4.70 5.13 8 3.95 5.88 8.33 1154 15.91 2.42 3.03 3.57 4335 4.49 4.88 9 4.11 6.25 9.09 13.04 18.92 2.36 2.94 3.45 3.90 4.30 4.65 10 4.29 6.67 10.0 15.00 23.33 2.31 2.86 3.33 3.75 4.12 4.44 11 4.48 7.14 11.11 17.6.5 30.43 2.26 2.78 3.23 3.61 3.95 4.26 12 4.69 7.69 1250 21.43 43.75 2.21 2.70 3.12 3.49 3.80 4.08