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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 , 9 feet - s- - a..5 4)w v 9 N-=>-t-,;>. b. Multiply rock layer width by landslope to determine drop in elevation; Slope Difference Coverx �} % = 100 - feet -0 lett Sepantlan C Add depth of clean sand depth of clean sand for Upiape Width 1 left Scope nure separation at upslope edge (2a) to depth of rock layer to itcck Bed Wldth rock depth and the depth of cover to find the total mound feet oa„n.lopeWdut height at upslope edge of rock layer; L-1,0 «*1" -- ``" .....,__- � .s ft+ 1 ft + 1 ft= 4.>' feet ,Ci-S-c '-was-C o. 3'. i s5 d. Enter table on page bottom with landslope and upslope A-ST 4a w- • --+--t > dike ratio. Select dike multiplier of 3 o3 '•1 SS L 6 3N� ► 770,,,*,,,,,t-£ e. Multiply dike multiplier by upslope mound height H 5 ,-1, S, to get upslope dike width: 4.0 x 3.0 = ) q feet 1 L f. Add the depth of slope difference(2b) to the upslope height to get the downslope height + = feet g. Enter table on page E-18 with landslope and downslope dike ratio. Select dike multiplier of . h. Multiply dike multiplier by downslope mound height to get downslope dike width: x------ _- -feet i. Mininmum mound width is the sum of upslope dike 1 tt-T.-)A-rf--le.- width plus rock layer width plus downslope dike width; ,-____ft- . __ - ft +-------ft-=- feet Rock Bed Width %D''''•. UpsbpeDikeWidth j. Subtract the Minimum width G.i from the Absorption width F.4 to find the Additional Downslope required for # ='.Rock Bed Length ss Absorption :}: --4t--- ft - feed Upsbpe Dike Width/S -:Upsbpe Dike Width k. Add the Additional Downslope required for Absorption to the downslopedike width and recalulate the Total >bio 'iiii 'wiad,"'' G ,+-�-1--.e. Mound Width which is is the sum of upslope dike • t )u.+la, _ width plus rock layer width plus downslope dike width "``''`'`'"''` `' ;a"'`' ''`''``''''' 3 41 )S 'ft+ o ft + i..s-- ft = 0 feet ,_ 1--Total Length_ ---� 1. Total mound length is the sum of upslope dike width 1 plus rock layer length plus upslope dike width; ) ft + 5. - ft + )S ft = c(6-- feet Downslope Upslope 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 5.66 654 7.41 2 3.19 4.35 556 6.82 8.14 2.83 3.70 454 5.36 6.14 6.90 3 I 454 5.88 7.32 8.86 2.75 337 4.35 5.08 5.79 6.45 4 3.41 41137: 6.25 7.89 9.72 2.68 3.4.5 4.17 4.84 5.46 6.06 { 5 _-t .i's 6.67 8.57 10.77 2.61 3.33 4.00 4.62 5.19 5.71 6 3.66 5.26 7.14 9.38 12.07 2.54 3.73 3.85 4.41 4.93 5.41 7 3.80 556 7.69 10.34 1373 2.48 3.12 3.70 4.23 4.70 5.13 8 3.95 5.88 8.33 1154 15.91 2.42 3.03 337 4.05 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 10 419 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 17.65 30.43 2.26 2.78 3.23 3.61 3.95 4.26 12 4.69 7.69 12.50 21.43 43.75 2.21 2.70 3.12 3.49 3.80 4.08