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• •G. DOWNSLOPE DIKE WIDTH
<br /> 1. If landslope is 2.9 percent or less,basal width includes both the
<br /> upslope and downslope dike widths,
<br /> 2. Calculate minimum mound size based on geometery:
<br /> a. Determine depth of clean sand fill at upslope edge of rock
<br /> layer: Separation _2._ feet
<br /> b. Multiply rock layer width by landslope to determine drop
<br /> in elevation; Slope Difference .'.
<br /> 0 x O % 100 = 0 feet
<br /> 1n15.pudllai� ;,i• ' Is,r;;p,;. .
<br /> c. Add depth of clean sand depth of clean sand for up wt.kit ` .�,�;'a M1,;
<br /> separation at upslope edge (2a) to depth of rock layer to Rod did MI "
<br /> rock depth and the depth of cover to find the total mound -i" o...,...:.+,.wtdd,
<br /> height at upslope edge of rock layer; --..„..."..
<br /> 2- ft + 1 ft +'1 ft= . 4 feet
<br /> d, Enter table on page bottom with landslope and upslope
<br /> dike ratio. Select dike multiplier of 4', 0 Zx son 14• (040
<br /> e. Multiply dike multiplier by upslope mound height 4x 81 57.1-8.
<br /> to get upslope dike width: 0 x 4 = I CCD feet gxiox tc. ,- t.OA-t.
<br /> f, Add the depth of slope difference (2b) to the upslope
<br /> height to get the downslope height 4t. + y = 4- feet (SBS szvg 255 4-
<br /> g. Enter table on page E-18 with landslope and downslope
<br /> dike ratio. Select dike multiplier of 4
<br /> h. Multiply dike multiplier by downslope mound height
<br /> to get downslope dike width: 4 x4- =_la_ feet
<br /> i. Mininmum mound width is the sum of upslope dike
<br /> width plus rock layer width plus downslope dike width • ••r'/;:: `��r`:::.:�• :::. '.!'`:'':1;:::'`•:::,'_':::'':'
<br /> / ,;rr�{.;rjtlr}r,s{ti:,��'r•a•�� r. hr' 'r.ri: ;r:�:,:�.
<br /> 1 L ft + t 0 ft + )0 ft = e+ feet Re: 'Bcd'11+(dth',J,e'';`::vpgropcakeW:dt'K_ •{',.•.
<br /> j. Subtract the Minimum width G,i'from the Absorption ,'+:.:::: ;t```' ` '•. -'.`. ' %..''_ :.... "''•'.:':;;:s
<br /> width F.4 to find the Additional Downslope required for Rock •
<br /> Lc"8 '. .. ,
<br /> Absor tion ':.:::,•:r :'.•''1....
<br /> •,,• .•'.••rr:r'•:i a}::,•:.}:''::c.r:�i.'•r,'•,1•
<br /> P "'4 W: {.: �•:{. ; ,:•.•..::, ps pe l?ik.width
<br /> upabpcai�i�r;dth,.:� ,�:'�� ti:,•.,'. ' ,u �� �
<br /> ft ft = feet �... •• •lr:J : r.;r.:l..,..,.
<br /> k. Add the Additional Downslope required for Absorption'';i;;?r::.;;.i::,:':l:�r;.•' ,:.,•�.,,•'• " :_
<br /> •.:' i:'.•..;,}:s'.::;;, ;;;I�uwi lope Dtkc Width ..
<br /> to the downslope dike width and recalulate the Total ' • ''••.;• +''�:{',ti•';• ; • • . ;;:;;•
<br /> - Mound Width which is is"the sum of upslope dike rr;:::;,;;{:.,*.:r �r}';:;•.rf}.::v.::.%4!... '•}r:•. 's:tirti:
<br /> :'r•.:• ?t;r,}r,.+;' i?,.: l:;r.;;,:•f rt:;tl;i:;�;;r;};r:,}:r
<br /> width plus rock layer width plus downslope dike width ' - ' ' '" _�
<br /> .ft + ft +_ ft 4� feetTotal IAngth,,,,_
<br /> 1. Total mound length is the sum of upslope dike width
<br /> plus rock layer length plus upslope dike width;
<br /> Ito ft + SO ft + !to ft = 51 feet
<br /> 3:1 4:1 1�w11s1OY10 U 6:1 7:1 3:1 4:1 &.3to611 7:1 8:1
<br /> %Mopo
<br /> 0 3.0 ,9,1_ 5.0 6.0 7.0 3.0 4.0 5.0 6.0 7.0 8.0
<br /> 1 3.09 4.17 3.26 6.38 7.53 2.91 '3T 4.76 5,66 651 7,41
<br /> 2 3.19 4.35 6.56 6.82 5.14 2.83 3.70 454 5.36 6,14 6.90
<br /> 3 330 454 5.88 7.32 8,86 2.75 3.57 4.35 8.06 5.79 6.45
<br /> 4 3.41 4.76 6,75 7.89 0.72 248 3.45 4.17 4.84 5.46 6.06
<br /> 5 3.53 5.00 6.67 8.57 10.77 2.61 3.33 4.00 4.62 5.9 5.71
<br /> 6 346 5.26 7.14 9.38 12.07 2.51 3.23 3.85 4.41 4,93 8,41
<br /> • • 7 3.80 5.56 7.69 10.34 13.73 2.48 ' 3.12 8.70 4.23 6.70 5.13 •
<br /> 1 3.95 5.88 8.33 1154 15.91 2.42 8.00 337 4.06 4.49 4.88
<br /> 9 4.11 6.2.5 9.09 13,04 18.92 214 2.94 3.45 3.90 4.30 4.63
<br /> I0 429 6.47 10.0 15.00 2313 2.31 2.86 333 3.73 1.12 4.44
<br /> 11 4.48 7.14 11.11 17.63 30.43 2.26 2.75 3.23 3,61 3,95 426
<br /> 12 4.69 7.69 1250 21.43 43.73 2.21 2.70 312 3.49 5.60 4,08
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