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G. DOWNSLOPE BERM WIDTH Slope: Cover 1'
<br /> 1. If landslope is 1% or more, r
<br /> _ 1 s'•'wt.• • .'. .
<br /> subtract rock layer width from adsorption width 12;,t,t,.l,s•5 Rocks VT, ,> ,
<br /> to obtain minimum downslope berm toe -- :',Th ..... a.%Sand _-,,r:/ ,.<.'" �1`°;.E. , `.
<br /> n ?. .'T,r 6•Topsoil r
<br /> r , ' op :Y
<br /> 2..'? ft - /1) ft = I -) feet Natural Soil .1')t
<br /> 2. Calculate Minimum mound Size L'.---gi"'c`
<br /> e Width
<br /> Downslope Width
<br /> a. Determine depth of clean sand fill at Upslop�, ,
<br /> `"
<br /> upslope edge of rock layer: Rock)Width Absorption Width
<br /> Separation 3' - /• -) ft = i•--s feet •
<br /> b. Add depth of clean sand for separation (2a)
<br /> at upslope edge, depth of rock layer (1 foot) to depth of cover
<br /> (1 foot) to find the mound height at the upslope edge of rock layer;
<br /> 1.---', ft + lft + lft = _3.: feet - �¢y `
<br /> c. Enter table with landslope and upslope berm r :Upslope Widti; .
<br /> ratio. Select berm multiplier of 3.3 3 :_., s Kyo ^*•MA 11.O•���0•
<br /> U slo Width'•�o�*g7'# Rock Bed >aa3:04.x. .Upslope Width •A:
<br /> d. Multiply berm multiplier by upslope mound pl, pe ;.,fritri a 4 LWidth 1Q_7 =P.a,,o¢A 1 o
<br /> height to find upslope berm width: `i1 ,,` �, ` .�:4, .j6 'a.y.tu =cl.o.•�q ¢ G ;`''` ,,
<br /> `.J `'7 .h,.I ; (14(1+i( err aQ'i, ` 'C.5. lY : ',:;)7;1;1.
<br /> 3, x = " = 11 feet 's er�Ni414q,.-.,4;,,,...;;‘,..:,•4,,;•;',14,:i.,:;,.4;•,
<br /> i , "ti ( x )i4 7�1 ! v `i ,' � i, 'K ,, } ':
<br /> e. Multiply rock layer width by '' `.` r
<br /> landslope to determine drop in elevation; ° :',..•....
<br /> ' ` "'s Downslope Width zo
<br /> F- . ' ` r Absorption Width 1 .�r�r.
<br /> !c X ' %+ 100 = . S" feet �„.� y !:, , „ �` r ih,r„ r ` '
<br /> . ..r.-;...:•• ly);;;J:',1::!ii!' .r!d J11J"��'' .:..... '} -':; ..
<br /> f. Add depth of clean sand for slope Total Length )o
<br /> difference (2e)at downslope edge, to
<br /> the mound height at the upslope edge
<br /> of rock layer (2b) to find the downslope height;
<br /> 1,2 ft + • .c ft = - r feet
<br /> g. Enter table with landslope and downslope berm ratio. Select
<br /> berm multiplier of .0
<br /> h. Multiply berm multiplier by downslope mound height to get
<br /> downslope berm width:
<br /> <,O x .-..7 = )`- feet BERM SLOPE MULTIPLIERS
<br /> I. Compare the values of step G.1 )
<br /> and Step G.2h i) 05,.- 3n Land DOWNSLOPE UPSLOPE
<br /> Slope, berm multiplkrs for various term multipliers for various
<br /> Select the greater of the two values as the in% berm slope ratios berm slope ratios
<br /> downslope berm width; feet
<br /> Total mound width is the sum of 3:1 4:1 5:1 6:1 7:1 3:1 4:1 5:1 6:1 7:1 8t1
<br /> j. 0 3.0 4.0 5.0 6.0 7.0 3.0 4.0 5.0 6.0 7.0 8.0
<br /> upslope berm (G.2d) 1 3.09 4.17 5.26 6.38 7.53 2.91 3.85 4.76 5.66 6.54 7.41
<br /> 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
<br /> 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
<br /> 1 1 ft + /c ft+ C, ft = 4 1 feet 4 3.41 4.76 6.25 7.89 9.72 2.68 3.45 4.17 4.84 5.46 6.06
<br /> 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
<br /> 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
<br /> 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
<br /> 11 ft + vt- ft + 1 ft = `. 1--1 feet 8 3.95 5.88 8.33 11.54 15.91 2.42 3.03 3.57 4.05 4.49 4.88
<br /> 0 +. (e-Z- .t_ c O /D 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 4.29 6.67 10.00 15.00 2.3.33 2.31 2.86 3.33 3.75 4.12 4.44
<br /> 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
<br /> 12 4.69 7.69 12.50 21.43 43.75 2.21 2.70 3.12 3.49 3.80 4.08
<br /> 1 ) X `) , /-)0. - 111
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