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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 /> 'AL.') ft- )o ft = 1 9 feet • <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 I.4 feet <br /> b. Multiply rock layer width by landslope to determine drop ,,, <br /> in elevation;Slope Difference ?..::f 1 foot Rock: • <br /> /0 x 3 % - 100 = . 3 feet <br /> idt <br /> c. Add depth of clean sand depth of clean sand for "°`'°�.. " <br /> lkd <br /> separation at upslope edge (2a) to depth of rock layer to _ W <br /> ow...lope Width <br /> rock depth and the depth of cover to find the total mound °-i-. `. <br /> height at upslope edge of rock layer; <br /> 1.se ft + 1 ft + 1 ft = 3.s, feet <br /> d. Enter table on page bottom with landslope and upslope <br /> dike ratio. Select dike multiplier of 3 -St-) So‘.‘'tH 3•i< }•S -y.3 <br /> e. Multiply dike multiplier by upslope mound height y .3 ,c 3.51 = 15 viVSN.oY.E._ <br /> to get upslope dike width: a.c6 x •- •_, 7 = 14 feet 1-N04 4- ) y 34, .'I - 9•6i <br /> f. Add the depth of slope difference (2b) to the upslopeoc�>,sw � <br /> e <br /> height to get the downslope height 4-� 4.SN = 1 <br /> 3.6' + .3 = 4. 1 feet <br /> g. Enter table on page bottom with landslope and <br /> downslope dike ratio. . <br /> Select dike multiplier of 4.5 4 <br /> h. Multiply dike multiplier by downslope mound height <br /> to get downslope dike width: 4.1 x 4.64 = 1CI feet tJtrg- - <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 /> /9 feet s' :::::::: :;: ::: . <br /> IS ' <br /> j. Total mound width is the sum of upslope dike Rock Bed Width " 6'' .:upsiopeourwiaw' 14 <br /> " width plus rock layer width plus downslope soy '••'•'•'•'`. ':::: <br /> 151t1oI,r�,►'- dike width; %:....-::.:"::.:-::.:.: ::.:....:• :.:*:' • � : ; <br /> y(.� 'Nps :. . .: <br /> 14 ft + 1 v ft + /q ft = y3 feet Upslope Dike Widti;_ ;•upslope Dike Width <br /> k. Total mound e length is the sum of upslope <br /> g P P <br /> ' o siope:• Width <br /> dike width plus rock layer length plus �► <br /> upslope dike width • iq ' <br /> t 5 ft + 5 S ft + i y ft = $t feet F., Total Length 4i <br /> t 07 -fi s s -►- a 1 = CI 9 s <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 4.0 5.0 6.0 7.0 8.0 <br /> 1 3.09 4.17 5.26 6.38 7.53 2.91 3.85 4.76 5.66 6.54 7.41 ''" <br /> 2 3.19 4.35 SS6 6.82 8.14 2.83 4.54 5.36 6.14 6.90 <br /> 3 3.30_ C4a"?.-----5.88 7.32 _8.86 2.75 357 4.35 5.08 5.79 6.45 <br /> 4 3.41 4.76 6.25 7.89 9.72 4.17 4.84 5.46 6.06 <br /> 5 333 5.00 6.67 8.57 10.77 2.61 3.33 4.00 4.62 5.19 5.71 <br /> 6 3.66 526 7.14 9.38 12.07 2.54 3.23 3.85 4.41 4.93 5.41 <br /> 7 3.80 556 7.69 10.34 13.73 2.48 3.12 3.70 4.23 4.70 5.13 <br /> 8 3.95 5.88 8.33 1134 15.91 2.42 3.03 357 4.05 4.49 4.88 <br /> 9 4.11 6.25 9.09 13.04 18.92 2.36 2.94 3.45 3.90 4.30 4.65 <br /> 10 429 6.67 10.0 15.00 23.33 2.31 2.86 3.33 3.75 4.12 4.44 <br /> 11 4.48 7.14 11.11 17.65 30.43 2.26 2.78 3.23 3.61 3.95 426 <br /> 12 4.69 7.69 1250 21.43 43.75 2.21 2.70 3.12 3.49 3.80 4.08 <br />