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E-20 G. DOWNSLOPE DIKE WIDTH . 1. If landslope is 3% or more, subtract rock layer width from adsorption width to obtain minimum downslope dike toe 24 ft-/v ft = /4- ft 2. Calculate mound height at edge of rock layer on downslope side; a. Determine depth of clean sand fill at upslope edge of rock ...., •, layer: Separation / feet ' earr4nernor'> b. Multiply rock layer width by landslope to determine drop ION•- in elevation; Slope Difference ; R OOIRRR.MCR.SLOPS/IM IROCR MOTH 704 %, 100 = .8 ft _ R,. c. Add depth of clean sand depth of clean sand for separation at downslope edge to depth of rock layer to depth of soil backfill to get mound height at downslope edge of rock layer; / ft + : £5 ft + / ft+ / ft =.SMMft d. Enter table on page E-18 with landslope and downslope dike ratio. Select dike multiplier of 5.13e . e. Multiply dike multiplier by downslope mound height to get downslope dike width3:,6 xSe5 = Z43 ft g. Compare the values of step G.1 and Step G.2.f. Select the greater of the two values as the downslope dike width; .Z Z,..5 feet Rack layer width(d2) h. Calculate upslope dike width using upslope mound height and upslope dike multiplier/ from page E-18; 3 x 3.03 = / 0 ft Upslope dike width(It) i. Total mound width is the sum of upslope dike width plus Downslope dike width(el rock layer width plus downslope dike width; /0 ft+ /C) ft +ZZ3 ft= e/Z ft 3. If landslope is 2.9 percent or less,basal width includes both the upslope and downslope dike widths. a. Calculate downslope dike width using steps G.2.a. through G.2.f; feet b. Calculate upslope dike wid sing upslope mound height and dike multiplier m Page E-18; x = ft c. Add downslope dike wid h to up lope dike width to rock layer width ft+ ft + ft = ft E-18 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 7.53 2.91 325 4.76 5.66 654 7A1 2 3.19 4.35 556 622 8.14 223 370 4.54 5.36 6.14 6.90 3 330 4.54 5.88 732 8.86 275 357 435 5.08 529 645 4 3.41 476 625 729 9.72 2.68 3AS 4.17 4.84 5.46 6.06 5 3.53 510 6.67 8.57 1077 2.61 333 4.00 442 5.19 5.71 6 346 5.26 7.14 9.38 12.07 254 323 3.85 4.41 4.93 5.41 7 320 5.56 749 10.34 1373 2.48 3.12 370 423 470 5.13 8 3.95 528 833 1154 15.91 2.42 313 357 4.15 449 428 9 4.11 625 9.09 13.04 18.92 2.36 2.94 3.45 3.90 430 445 10 4.29 6.67 10.0 15.00 2333 2.31 226 333 3.75 4.12 444 11 4.48 7.14 11.11 1745 30.43 2.26 2.78 323 3.61 3.95 436 12 4.69 7.69 1250 21.43 43.75 221 2.70 3.12 3.49 380 4.08