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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 for
<br />absorption:
<br />.) (, 11 ft -_!_!) __ ft = I 1 feet
<br />2. Calculate minimum mound size based on gcometery:
<br />.,
<br />a. Determine depth of clean sand fill at upslope edge of rock
<br />layer: Separation /. 0 feet
<br />. b. Multiply rock layer width by lc1ndslope lo determine drop
<br />in elevation; Slope Difference
<br />__LQ_ x ~ % + 100 = _:_}j_ feet
<br />c. Add depth of clean sand depth of clean sand for
<br />separation at upslope edge (2a) to depth of rock layer to
<br />rock depth and the depth of cover to find the total mound
<br />height at upslope edge of rock layer;
<br />__ j__<Jl ft+ 1 ft+ 1 ft= 3, 0 feet
<br />d. Enter table on page bottom with landslope and upslope
<br />dike ratio. Select dike multiplier of '?, . 4 s
<br />e. Multiply dike multiplier by upslope mound height
<br />to get upslope dike width: 7 ,, u x ·:~ .. •-1,5' = _LQ_fcet
<br />f. Add the depth of slope difference (2b) to the upslope
<br />height to get the downslope height
<br />·., . :) + . !~ = :.'.'.. 1 I feet
<br />g. Enter table on page botlom with landslope and
<br />downslope dike ratio.
<br />Select dike multiplier of Lj , J 1.;;,
<br />h. Multiply dike mulliplier by downslope mound height
<br />lo get downslope dike width: ~ x :-hll:_ = _LL feet
<br />i. Compare the values of step G.1 and Step G.2.h. Select the
<br />greater of the two values as the downslope dike width;
<br />j. Totai :~undf:~~th is the sum of upslope dike R,Kk·iS~-'::;,,.:J""';i"'":)t,-;:\-:-;\,.,.,i'7"/""'t:-~"'"{:T./-:-:t,.,.,:~~'7";ii""'i"'"\~,t:\.,.,f,.,.,J;'7"~]""':;~"'"tJ,t{G.,.,•:::~,.,.,-:::,:-,-~::,,__tr-\
<br />~~:~!~~;rock layer width pl us downslope l)Jt,;,:_:: ::::''. ~::~:'.:::~::,::~:,:::-~''.'.]tit
<br />_}_Q_ ft + __LQ_ ft + _u_ ft = __3_2_feet Upslop<" i"Jike W1<liii'.'.1~0.-~·-··:,::::--:: :.-:::/~?:·:-r.-:::-:,up,lopr l)lke Wldth..LQ_
<br />k. !~i;~~:.~:~~~; \:i;; ::;l~f p~~:lope 1u~~~~!1l~~~~,i~~i~~l~:i~i~;;~
<br />/ o ft+ '-l 5 ft + / o ft= -1.c .-: f cct
<br />? -----Total 1.englh {,._(;_
<br />J ''\ l-) :, I . ·-1 ' ) (..., .-' ,,-) L~-,
<br />IJownslopc 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 />,_ ,lope
<br />0 3.0 4.0 5.0 6.0 7.0 30 4.0 5.0 6.0 7.0 8.0
<br />I 3JJ9 4.17 5.26 6.38 7.5] 2.91 u, 4.76 5.66 6.54 7.41
<br />2 3.19 4.35 5.56 6.82 8.14 2.HJ 3.70 4 r;.c 5.36 6.14 6.90
<br />3 3.30 4.54 5.1111 7.32 RM 2.75 J.5~_ 05 5.00 5.7'1 6.4.'i
<br />4 3.41 ( 4.76--,. 6.25 7.8Q 9.TI 2.6.'l ' J 4., ") 4.17 4.114 5.46 606
<br />5 3.53 5.00 6J,7 R.57 10.77 HI 1J3 4JX) 4.(,2 5.19 5.71
<br />6 ; 3.(,(, 5.26 7.14 .Q)8 12.07 2:'-4 J.23 HIS 4.41 493 5.41
<br />7 3.80 5.56 7.69 10_14 13.73 2.48 3.12 3.70 4.23 uo 5.13
<br />8 3.95 5.1111 8 3) 1154 15 91 2.42 J.11.1 3.57 4 lfi 4.49 488
<br />9 ... 4.11 6.25 9.09 13.04 IH.92 2.11, 2.94 3.45 J.90 uo H,5
<br />I{) 4.7'1 667 11111 I, (kl 7111 711 1 IV, 111 17, 4 17 4 44
<br />11 4.48 7.14 II.II 11.1,, JIUJ 2.26 17K Hl HI J.95 4.26
<br />12 H,'1 7.1,9 1150 11.0 4175 111 770 1.12 149 1110 4(11
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