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( ' I l( nv N>;I .( )J'F BERM VV II l I I I
<br />11 landslnpt' 1s I% or more,
<br />sulitr;1d rock lavcr \,vidth from ,1d:,11q 1 tH111 width
<br />to obtam minimum downslope bl·rm hH·
<br />_"?:-..O _ ft -_ _JQ_ ft= /0 feet
<br />2 Calculate Minimum mound Size
<br />.1 Determine depth of dean sand fill .11
<br />upslope edge of rock layer:
<br />Srparation 3' -""l_. ft= l 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 />_J_ ft + 1ft + 1ft = ~ feet
<br />c Enter table with landslope and upslope berm
<br />ratio. Select berm multiplier of 3 , Z.. ~
<br />t ,,,,,., I
<br />Rnd, W1dlh
<br />Down.slop,· Wicllh
<br />-· ----------1'-------------
<br />Abwrpl1on W1dlh ... ~
<br />Upslope Width
<br />d. Multiply berm multiplier by upslope mound Upslope Width Upslope Width
<br />height to find upslope berm width:
<br />3,__x ,3,'l.3 =~feet
<br />e. Multiply rock layer width by
<br />landslope to determine drop in elevation;
<br />/0 x b %+100=~feet
<br />f. Add depth of clean sand for slope
<br />difference (2e)at downslope edge, to
<br />the mound height at the upslope edge
<br />of rock layer (26) to find the downslope height;
<br />3 • 0 ft + D, 6 ft = ~feet
<br />g. Enter table with landslope and downslope berm ratio. Select
<br />berm multiplier of S -U
<br />h. Multiply berm multiplier by downslope mound height to get
<br />downslope berm width:
<br />S, t> x 5 .26 =/B~cr feet
<br />Downslope Width __
<br />Absorption Wid~--
<br />Total Length. __ _
<br />BERM SLOPE MULTIPLIERS
<br />DOWNSLOPE UPSLOPE
<br />i. Compare the values of step G. l /0
<br />and Step G.2h L!, °l
<br />Select the greater of the two values as the
<br />downslope berm width; /8 t=r feet
<br />j. Total mound width is the sum of
<br />upslope berm (G.2d)
<br />Land
<br />Slope
<br />in%
<br />berm multipl.itts for various
<br />berm slope ratios
<br />berm multipliers for various
<br />berm slope ratios
<br />width plus rock layer width (D.2)
<br />µJus downslope berm ~i9,~h(G_l~; 1 ~ ft + __j_Q__ ft + _/._t5_, 7 ft =~feet
<br />k. Total mound length is the sum of upslope
<br />0
<br />4
<br />.1: l 4:l
<br />3.0 4.0
<br />3.09 4.17
<br />3 19
<br />330
<br />.1 4 I
<br />berm width (G.2d) plus rock !aver length (Dl) ,, , I)( <<'1,
<br />plus upslope berm wi~tj, (C 2d);
<br />_/!f __ ft ~ J~_2-ft + 17---f I :: ?/ fot"1
<br />1 S(I
<br />~ '..J •.
<br />•.J 1 ~ l 1
<br />-!
<br />Final I)irnensions:
<br />I() 11 1 }<.)
<br />t: l -n-. ; J.:
<br />~:J
<br />'i.O
<br />~.26
<br />5 56
<br />6.25
<br />'"it'-'
<br />j(l(f,j
<br />ll )I
<br />6:1
<br />6.IJ
<br />6.38
<br />7 32
<br />7.89
<br />8.57
<br />I(} ·,o
<br />I\ (.~1
<br />1. ,.•
<br />7:1
<br />70
<br />7.53
<br />8.14
<br />8.86
<br />9 7}
<br />10.77
<br />I: 07
<br />U.73
<br />I~~ I
<br />!(; t..(l
<br />.J) .n
<br />w~·\
<br />3:1 4:1
<br />3.0 4.0
<br />2.91 3.85
<br />2.83 3.70
<br />2.75 ].57
<br />2.68 3.45
<br />2.61 3.33
<br />2.54 313 -?Ah 1 t;
<br />2 :n 'u,
<br />I ) J(, : 94
<br />_) 31 : ~;(1
<br />.' }(J 2 -,~
<br />~: I
<br />5.0
<br />4.76
<br />4 54
<br />435
<br />4. l 7
<br />4 ()()
<br />1 8~
<br />l, ')(}
<br />·,_')-,'
<br />~ ."j •
<br />6-l
<br />6(1
<br />5.66
<br />5 llt
<br />4 84
<br />4.67
<br />-~ .-:: ;
<br />:,(·'
<br />7:l
<br />70
<br />6.JA
<br />5.46
<br />'l_\9
<br />4 ')(l
<br />l\:I
<br />~.O
<br />7 41
<br />6.90
<br />6 06
<br />5.71
<br />5 l"i
<br />., s~
<br />,j .·,,
<br />-:Z.LJ, 6 X
<br />--~-·-· ----·---
<br />~~(,', ---(,'.· ___ : __ ~i: _., ••• __ ~_,_'_'·~-------~---~-~·· _______ --~~~--
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