|
� � , .
<br /> G. DOWNSLOPE BERM WIDTH ��: �, co��r
<br /> 1. If landslope is 1% or more, . ,,
<br /> subtract rock layer width rp o idth �� ��.: .� :�.:���;;�::,.�.`,�:., ��,
<br /> from adso ti n w �� �����^�Y � ��. ;�,� :,��,;
<br /> ;v?,2S':'t•.:,x� ROck 1 �x�0 ; �K` 'or�
<br /> to obtain minunum downslope berm toe , `� . "
<br /> C1eaa Sand ,,,;'t.� j �� �, , �:.r•�� e ti;r ,• �
<br /> �L,� {�- I C� � = ��_ feet =� ,3"�`, ° r;;?, 6�Topsoil
<br /> 2. Calculate Minimum mound Size
<br /> a. Determine depth of clean sand fill at U�►�w,ar� ��rv��,
<br /> upslope edge of rock layer: �w,��, �a���
<br /> Separation 3' - l, 0 ft = a,o teet -L°- �'�
<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 /> a •o ft+'lft+ lft= �,U feet _ � �� _
<br /> c. Enter table with landslope and upslope berm ; r�` �. Up�o� w.,��, : � .
<br /> ratio. Select berm multiplier of �.�''� , � ' r �+��--� �.
<br /> d. Multiply berm multiplier by upslope mound ��,Up�"r�w:'::a'��:��r„" Rock Bed �o:Pox41.�.;�..:u �o�w�ar�°:-.;:
<br /> � ti,• !U � p j1� Width o �a:•a'-••r��+r p��
<br /> height to find upslope berm width: -�� ',xY;;;,:4�;;� � �����°�'� � �,i���Q���. <�
<br /> �s � � ,�� . .� � :��d►.��.� l,t��t
<br /> �x �. • =�_feet .� .���� ,�s , ,�s��a�,��;t�;� ,� �,r�,,aw�c ' r;�Y�,�t�`rs� ,., .
<br /> fc 4 }` a 7 l �, .
<br /> e. Multiply rock layer width by � . �'<'- >'�ti � ```" °'' ` "�' `':�, ` `
<br /> A � ''
<br /> '="i },',,;.��+�` , , ,, 'r .. ._ . k '
<br /> landslope to determine drop in elevation; F �' T , ��;`'y: �o��r�a ��r� �o �> ,,�,, �
<br /> � �_o , Abso,paoa w,dt2t t�
<br /> �� x /0+ 100 = �.feet � T'?� ,, �+ { �,,,� ,; .s.t� .,, : { r:�� ' �
<br /> f. Add depth of clean sand for slope "" ''''k''`°'�'�`' ''''h� "�� �+ ' ' ��
<br /> difference (2e)at downslope edge, to
<br /> roc����'
<br /> the mound height at the upslope edge
<br /> of rock layer (2b) to find the downslope height;
<br /> -� �t + ft= 4.3 feet
<br /> g. Enter table with landslope and downslope berm ratio. Select
<br /> berm multiplier of y-�y
<br /> h. Multiply berm multiplier by downslope mound height to get
<br /> downslope berm width:
<br /> y•� x u.� = ac� feet SERM SLOPE MUL?IPI.IERS
<br /> i. Compare the values of step G.1�
<br /> and Step G.2h �� I..aa ��t � � UpSLOPE
<br /> Select the greater of the two values as the ��c e��.�. ��.��`'°"`
<br /> downslope berm width; a c feet
<br /> j. Total mound width is the sum of
<br /> upslope berm (G.2d) 0 3.o a.o s.o 6.0 �.o s.o a.o s.o 6.0 �.o s.o
<br /> width plus rock layer width (D.2) ' 3.� a.l� s.za 6as �s3 z.s� s.as a.�6 s.� b.sa �.a�
<br /> 2 3.t9 4.35 S.S6 6.82 8.14 2.83 3.70 4.34 5.36 6.14 6.90
<br /> plus downslope berm width(G.2i); 3 3.�o a:sa-� s.as �.sz s.sa z.�s .3s�� a.ss s.os s.�9 b.as
<br /> I�-I ft+ 1 o ft+ �o ft = ��feet a s.ai a.�6 a.zs �.s9 9.n z.a� �i.as a.i� a.sa s.a6 b.o6
<br /> IC. Total mound length is the sum of upslope S 3.53 5.00 6.67 8.57 10.71 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 s.z� �.i� 9.�s «.m z.sa s.a� 3.as a.ai 4.93 s.ai
<br /> plus upslope berm width (G.Zd�; 7 3.80 S.S6 7.69 l0.34 13.73 2.48 3.I2 3.70 4.23 4.70 5.13
<br /> 1�._ft+�_ft+ 1� ft = �63 feet $ 3.9s s.sa 8.33 ii.0 is.9i iaz s.os s.s� a.os a.a9 a.ss
<br /> � O -+- .�5 -+ ;�c� -9� 9 4,(I 6.23 9.09 13.04 18.92 2.36 2.44 3.45 3.90 4.30 4.65
<br /> 10 4,29 6.67 10.00 I3.00 23.33 2.31 2.86 3.33 3.75 4,12 4.44
<br /> Final Dunensions. 1l 4,48 7.14 I1.11 17.63 30.43 2.26 2.78 3.23 3.61 3.93 4.26
<br /> 12 4.69 7.69 1Z30 21.43 43.75 2.21 270 3.12 3.49 3.80 4,p8
<br /> `--�'-� X `z�� A v�
<br />
|