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E-20 <br /> , Al if ynlie: .T(.1271;i: 5_771 . <br /> G. DOWNSLOPE DIKE WIDTH <br /> 1. If landslope is 3% or more, subtract rock layer width from , .,- <br /> adsorption width to obtain minimum downslope dike toe .1-- <br /> ) s ft - ! v ft = c ft <br /> 2. Calculate mound height at edge of rock layer on downslope <br /> side; <br /> a. Determine depth of clean sand fill at upslope edge of rockb-! <br /> layer: Separation , Z feet < nr s .003..:;: <br /> b. Multiply rock layer width by landslope to determine drop - <br /> in elevation; Slope Difference • rn.ez,..cavi,Me z ROCK tnemr <br /> 1n x 4 % + 100 = O , L ft <br /> c. Add depth of clean sand depth of clean sand for <br /> separation at downslope edge to depth of rock layer to <br /> depth of soil backfill to get mound height at downslope <br /> edge of rock layer; <br /> ft + C',y ft + I ft+ / ft = I-0 ft <br /> d. Enter table on page E-18 with landslope and downslope <br /> dike ratio. Select dike multiplier of Li - je . <br /> e. Multiply dike multiplier by downslope mound height <br /> to get downslope dike width: tJ i Li xqt-it- = ;0.ci ft <br /> g. Compare the values of step G.1 and Step G.2.f. Select the <br /> greater of the two values as the downslope dike width; <br /> C? ,9 feet Rade layer width(d2) <br /> h. Calculate upslope dike width using upslope mound \ `- • <br /> height and upslope dikemultiplier from page E-18; <br /> ti x 3.'i ,= 1' ft Upabpe dike width(10 <br /> Downslope dike width(e) <br /> i. Total mound width is the sum of upslope dike width plus <br /> rock layer width plus downslope dike width; <br /> 13 ,Z) ft + lb ft + ..O3 ft = 1--P-).7 ft <br /> 3. If landslope is 2.9 percent or less,basal width includes both the <br /> upslope and downslope dike widths. <br /> a. Calculate downslope dike width using steps G.2.a. <br /> through G.2.f; feet <br /> b. Calculate upslope dike width using upslope mound <br /> height and dike multiplier from Page E-18; <br /> x ft = ft <br /> c. Add downslope dike width to upslope dike width to rock <br /> layer width <br /> ft + ft + ft = ft <br /> E-18 <br /> Downslope Upsiope <br /> 3:1 4:1 5:1 6:1 7:1 3:1 4:1 5:1 6:1 7:1 8:1 <br /> 9.slope <br /> 0 3.0 4.0 5.0 613 7.0 3.0 4.0 5.0 6.0 7.0 813 <br /> 1 3139 4.17 526 638 753 291 385 4.76 566 654 7.41 <br /> 2 319 4.35 556 632 8.14 2.83 370 454 536 6.14 6.90 <br /> 3 330 454 5.865 7.32 8.86 275 357 4.35 5.06 579 6.45 <br /> 4 341 476 6.25 729 972 268 3A5 417 4.84 546 6.06 <br /> 5 353 550 6.67 8.57 1077 261 333 4D0 462 5.19 5.71 <br /> 6 3.66 526 7.14 938 12.07 254 323 385 441 4.93 5.41 <br /> 7 320 556 769 1034 1373 2.48 3.I2 370 423 420 5.13 <br /> 8 3.95 528 833 1154 15.91 2.42 333 357 4155 449 4.88 <br /> 9 4.11 625 9139 13.04 18.92 2.36 2.94 345 3.90 430 4.65 <br /> 30 429 6. 10.0 15133 23.33 2.31 226 333 325 4.12 4.44 <br /> 11 4.4.9 7.14 11.11 17.65 30.43 2.26 2.78 323 361 3.95 4.26 <br /> ea: 74.: i•• 7.41 41-, 7 117') 3.72 14R 3?iI 408 <br />