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u FAS/T-4- G. DOWNSLOPE BERM WIDTH Slope:- Cover 1' 4,S = / O ' y yeti Vim'y''''yg ..��.- 1. If landslope is 1% or more, ). €�. r ''` 1 ;rt "b ye '1 ' .fir •e subtract rock layer width from adsorption width �, , , .•• ::..f.ok *:'.Z _�� 6,A, �,. to obtain minimum downslope berm toe c4.�` +" y, ' clean Sana I r,, :' ; .7./ .-, , rP'''''..lr,: 6 Topsoil , 27 ft - /U ft = / 7 feet Natural Soil it 3 2. Calculate Minimum mound Size a. Determine depth of clean sand fill at Upslope Width Downslope Width ....QC) 4-•• upslope edge of rock layer: /34"4ir Rock Width .4 Absorption Width7 Separation 3' - /r 3 ft = /, 7 feet JO 4- b. Add depth of clean sand for separation (2a) 5 44 -9- -- l-1 a/c -=t 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; 17 /,7 ft + lft lft = 3,7 feet • c. Enter table with landslope and jloPe berm UpSiuPe Width /3 •ratio. Select berm multiplier of 3 . ra a.�Ov vex- a00`r�� d. Multiply berm multiplier byupslope mound M tipeiepe Width °oop'n dougo, w►:Bed Coo4p�'oa.i,A llpslvpe Widn u.o.e0 e• a( a o..a o-oco< P Y PyD Pet q iPPO.F o1 oG JY?��i•4uv�Qyo oouua Qo9,kg;9pDC: '17 1 height to find upslope berm width: � ...11.0....:-.'::. 3..5 x3,7 = /Z9 feet - /3+ e. Multiply rock layer width by Zo 12 Downslope Width landslope to determine drop in elevation; Absorption Width 17 •.� • . /c. x 5' % 100 = Q.6/ feet - f. Add depth of clean sand for slope Total Length difference (2e)at downslope edge, to 7S . the mound height at the upslope edge of rock layer (2b) to find the downslope height; -3.7 ft +Or '9' ft = A4/ feet g. Enter table with landslope and downslope berm ratio. Select t4 term multiplier of • h. Multiply berm multiplier by downslope mound height to get BERM SLOPE MULTIPLIERS downslope berm width: 4i/ x'/ X =/9:7 feet - (.-7° 4i- Land DOWNSLOPE UPSLOPE i. Compare the values of step G.1 1 7 Slope, berm multipliers for various berm multipliers for various in% 1 berm slope ratios berm slope ratios and Step G.2h 2 Select the greater of the two values as the 3:1 6T)5:1 6:1 7:1 3:1 4�:1 5:1 6:1 71 downslope berm width; 2 0 0 3.0 4.0 5.0 6.0 7.0 ' 3.0 4.0 ' 5.0 6.0 7.0 r. p feet j. Total mound width is the sum of 1 3.09 4.17 5.26 6.38 7.53 2.91 3.85 4.76 5.66 6.54 upslope berm (G.2d) 2 3.19 4.35 5.56 6-82 8.14 2.83 3.70 4.54 5.36 6.14 t, 3 3.30 4.54 5.88 7.32 8.86 2.75 3.57 4.35 5.08 5.79 t. width plus rock layer width (D.2) 4 3.414.7 .25 7.89 9.72 2.68 `3 4.17 • 4.84 5.46 0 plus downslope berm width(G.2i); 5 3.53 5.00 6.67 8.57 10.77 2.61 3.33 4.00 4.62 5.19 /3 ft + /0 ft + 20 ft = --3 , feet 6 3.66 5.26 7.14 9.38 12.07 2.54 3.23 3.85 4.41 4.93 5 k. Total mound length is the sum of upslope 7 3.80 5.56 7.69 10.34 13.73 2.48 3.12 3.70 4.23 4.70 5. berm width (G.2d) plus rock layer length (D.3) 8 3.95 5.88 8.33 11.54 15.91 2.42 3.03 3.57 4.05 4.49 4 �}�p plus upslopebermwidth (G.2d);/ 9 4.11 6.25 9.09 13.04 18.92 2.36 2.94 3.45 3.90 4.30 4 JI-"47-5 ft + ' / ft + / 3 ft = 6 7 feet 10 4.29 6.67 10.00 15.00 23.33 2.31 2.86 3.33 3.75 4.12 4. `��(1 I7 4' 4 l 1 4- 7 ;-7 J,1J 1I 4.48 7.14 11.11 17.65 30.43 2.26 2.78 3.23 3.61 3.95 4. , . /` 12 4.69 7.69 12.50 21.43 43.75 2.21 2.70 3.12 3.49 3.80 4 1 Final D im esi ons o Note:The product of the multiplier and the height results in the horizontal distance to where k term meets the original land slope.Example:Height at upper edge of rock layer is 3.0 feet.i. Cl/ ,p� X = ^ ayer is 10 feet wide,land slope is 6%and berm slope ratio is 4:1.Upslope berm width is 3.? _1I/` z S•i-t)/-- 3.0=9.7 ft;height at lower edge of rock layer is 3.0+10 x 0.6=3.6 ft and downslope berm v.. a 5.26x3.11=18.9ft. a 305-3 - ci