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G. DOWNSLOPE BERM WIDTH Slope:_ Cover r 1. If landslope is 1% or more, c subtract rock layer width from adsorption width �� <;Y, Rom i • o I to obtain minimum downslope berm toe _e Clean Sandi,,;' ' o=,oil 7 ;t!:l ft- 10 ft . 1 -2 feet Natural Soil 9plorn - , 6.Topsoil j 2. Calculate Minimum mound Size a. Determine depth of clean sand fill at upslopehath Downslope Width upslope edge of rock layer: Rock width Absorption Width • Separation 3' - < .`� ft = !• 'l feet b. Add depth of clean sand for separation (2a) at upslope edge, depth of rock layer (1 foot) to depth of cover (1 foot) to find the mound height at the upslope edge of rock layer; /. ft + lft + lft = ?•C , feet _ 50,'_ c. Enter table with landslope and upslope berm ': Uplope Width ratio. Select berm multiplier of 3..c)y 'Upslope Width N�o oQp000 D;,Rorck Bed v�rewvay�oaoab,, U.. pslo pe Widthd. Multiply berm multiplier byupslope mound ..:7 ao „ �Sq width g�641)a '=7height to find upslope berm width: H ;0Av5.4o Le"fth aoQ4es D.° x o = 9 feet e. Multiply rock layer width by landslope to determine drop in elevation; ,t2'. Downslope width ay Absorption width l'J /0 x "7 %= 100 = , 9 feet f. Add depth of clean sand for slope difference (2e)at downslope edge,to Total Length___ __ the mound height at the upslope edge of rock layer (2b) to find the downslope height; .o ft + ft = :'•c't feet g. Enter table with landslope and downslope berm ratio. Select berm multiplier of --/--s" . h. Multiply berm multiplier by downslope mound height to get downslope berm width: (, x 3•( = a`-) feet BERM SLOPE MULTIPLIERS i. Compare the values of step G.1 1 9 and Step G.2h a`-1 Land DOWNSLOPE UPSLOPE Slope. berm multipliers for various berm multipliers for various Select the greater of the two values as the in% berm slope ratios berm slope ratios downslope berm width; `-1 feet 3:1 4:1 5:1 6:1 7:1 3:1 4:1 5:1 6:1 7:1 8:1 j. Total mound width is the sum of upslope berm (G.2d) 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 3.85 4.76 5.66 6.54 7.41 width plus rock layer width (D.2) 2 3.19 4.35 5.56 6.82 8.14 2.83 3.70 4.54 5.36 6.14 6.90 plus downslope berm width(G.2i); 3 3.30 4.54 5.88 7.32 8.86 2.75 3.57 4.35 5.08 5.79 6.45 j7 ft + /c ft+ 0`-J ft = HZ feet 4 3.41 4.76 6.25 7.89 9.72 2.68 3.45 4.17 4.84 5.46 6.06 k. Total mound length is the sum of upslope 5 3.53 5.00 6.67 8.57 10.77 2.61 3.33 4.00 4.62 5.19 5.71 berm width (G.2d) plus rock layer length (D.3) 6 3.66 5.26 7.14 9.38 12.07 2.54 3.23 3.85 4.41 4.93 5.41 plus upslope berm width (G.2d); 7 3.80 5.56 7.69 10.34 13.73 2.48 3.12 3.70 4.23 4.70 5.13 ft + =1 I ft + .=."---) ft= 59 feet 8 3.95 5.88 8.33 11.54 15.91 2.42 3.03 3.57 4.05 4.49 4.88 ` L\ I ,i- 9 9 4.11 6.25 9.09 13.04 18.92 2.36 2.94 3.45 3.90 4.30 4.65 10 4.29 6.67 10.00 15.00 23.33 2.31 2.86 3.33 3.75 4.12 4.44 Final Dimensions: 11 4.48 7.14 11.11 17.65 30.43 2.26 2.78 3.23 3.61 3.95 4.26 12 4.69 7.69 12.50 21.43 43.75 2.21 2.70 3.12 3.49 3.80 4.08 H 3� X '79 Pfrk--