|
DOWNSLOPE BERM WIDTH slope: Cover 1•
<br /> 1. If landslope is 1% or more, .
<br /> subtract rock layer width from adsorption width , �,, t,7, xo�1. r..4. , Kt '
<br /> �Qos H
<br /> to obtain minim 5;r clean sand 1_ r; . : ':
<br /> um downslope berm toe '�� + �; ';' `` �" � �x , : 6•Topsou*�.•�
<br /> 1_,.o, ft - /D ft = ____L:2_ feet ; aural Soil s4/I)
<br /> 1 2. Calculate Minimum mound Size -g''
<br /> a. Determine depth of clean sand fill at upslope width "'ted'
<br /> y
<br /> upslope edge of rock layer: T R wldd, 1 Ab rp on width
<br /> Separation 3' - 2, 0 ft = 3. 0 feet 1 j
<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 /> ft + lft + lft = Li .0 feet
<br /> c. Enter table with landslope and upslope berm r.` . UpslopeWtdc
<br /> ratio. Select berm multiplier of
<br /> } 3 .33 . •t ��,` ' Rock ( ''�4"•.�`"- '+Up&`
<br /> Bed o
<br /> Widt
<br /> h ,
<br /> d. Multiply berm multiplier byupslope mound .,,,':u1'4°&``Width ",, jEi width io _y ��� :: \�` .:.
<br /> height to find upslope berm width: : ii' t.
<br /> t = a ' i ,, t''i
<br /> G `' tiht,- ,(D X ��� = �, feet ai ,J yt � t0%!:? Ii'r Jiro^ ,(t tr 1ii iZ ?�i{Ye, �i {
<br /> .
<br /> ric +rsti�t ''Y='t.ia �,x,< 7il� SLt1:A „1ir��) te'' t} x };
<br /> e. Multiply rock layer width by ...:;;;:..:,..-.. ..,:4,,,:.,:,c;:;. :;),)' `? ` e
<br /> . :. ..
<br /> landslope to determine drop in elevation; F 't '. ` ` °oma°p`Width ;,71, - ' "'
<br /> Absorption Width t -) :.<
<br /> 10 x S %+ 100 = ,,t- feet '? �"!� ., { t . ,� c? ,
<br /> f. Add depth of clean sand for slope Total Length io
<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 /> y,L ft + s ft = L 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 /> , L x L). C = feet BERM SLOPE MULTIPLIERS
<br /> i. Compare the values of step G.1 1 -7 I 1
<br /> and Ste G.2h �Th Laad DOWNSLOPE UPSLOPE
<br /> PSlope, berm multipliers for various berm multipliers for various
<br /> Select the greater of the two values as the in% berm slope ratios berm slope ratios
<br /> downslope berm width; a 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 8:1
<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 ft + /0 ft + o ft = Ll ‹. 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 /> -, ft + (-, ft + ) ft = 45. 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 /> 3 -+ ;t- i)" JO 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 23.33 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 /> 1L X ! ADC.
<br /> l 1
<br />
|