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. E-20 <br /> " Pr) m �� <br /> r�hl �?1eTr, <br /> G. DOWNSLOPE DIKE WIDTH J <br /> 1. If landslope is 3% or more, subtract rock layer width from <br /> adsorption width to obtain minimum downslope dike toe .l <br /> /D ft - /L) ft = 6 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 rock <br /> layer: Separation :9Z feeteirnzi.icorz` <br /> b. Multiply rock layer width by landslope to determine drop '°"-- <br /> in elevation; Slope Difference ; _DZIPTIINCt.SLAPS I MW I NOCK WIDTH <br /> /b x 6 % y100 =11, (, ft SIMS- • <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 /> np, ft + 6 . ft + ( ft+ I ft = y.(n ft <br /> d. Enter table on page E-18 with landslope and downslope <br /> dike ratio. Select dike multiplier of S,a (-. . <br /> e. Multiply dike multiplier by downslope mound height <br /> to get downslope dike width:'-1' ( x 5- <br /> •.2G- _LE.2,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 /> L I- g, feet Rods layer width(d2) <br /> h. Calculate upslope dike width using upslope mound i- . <br /> height and upslope dike multiplier from page E-18; <br /> Lf x 3 =1-13-1-ft Up.bpe d lir width(h) . <br /> i. Total mound width is the sum of upslope dike width plus mope dike w,d[tl(e) . <br /> rock layer width plus downslope dike width; 1 <br /> 0; 1 ft + /U ft + / eft= q7. 1 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 1 <br /> E-18 <br /> 14, <br /> Downslope Upslope <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 40 5.0 6.0 7.0 8.0 <br /> 1 3.09 4.17 526 6.38 7.53 291 325 4.76 5.66 654 7.41 <br /> 2 319 4.35 556 622 8.14 223 370 454 536 6.14 6.90 <br /> 3 330 434 528 7.32 826 275 357 4.35 5118 5.79 6.45 <br /> 4 3.41 4.76 625 729 9.72 2.68 3A5 4.17 434 5.6 6.06 <br /> 5 353 51)0 617 857 10.77 221 3.33 4.00 442 5.19 571 <br /> 6 3.66 526 7.14 938 12177 2.54 323 325 4.41 4.93 5.41 <br /> 7 320 556 7.69 1034 13.73 2.48 3.12 370 423 4.70 5.13 <br /> 8 3.95 528 833 1154 15.91 2,42 3103 357 4.05 4.49 428 <br /> 9 4.11 625 9.09 13.04 18.92 2.36 2.94 3.45 390 4.30 4.65 <br /> 10 429 6.67 10.0 15.00 23.33 2_31 226 333 375 4.12 4.44 <br /> 11 4.48 7.14 11.11 I7.65 30.43 226 278 323 3.61 3.95 426 <br /> 4 E9 7.E= 12,C 21 41 437 221 2,70 3.12 3.49 3.90 4.08 <br />