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: <br /> '/ . <br /> �' 3 �F��,�.:�,�^. <br /> ,� r•.-2o <br /> / MOUND DESZGN PROCEDURE , <br /> (For Flows up to 1200 �P��Continu�d) <br /> G.3. Calculate basal width ratio ' H.2.f. MulCiply. dike multiplicr hy <br /> by dividin� rock layer Z downs.lop�e mound d�eight to ge� <br /> loading rate of 1.20 gpd/ft downslope•"d'zice'�width; <br /> by allowable soil loading y 76X 3,� - �6.2 �t ` � <br /> rate; — <br /> 1.20 gpdi f t� = �gpd/f t2 = �, 0 g• Compare the values of step }i. 1 <br /> Check this value on page E-16, and sCep 11.2.f. Select tl�e <br /> greater of the two�valuc, as <br /> 4. Multiply basal widtti ratio by Clie downslopc dilce wicltli; <br /> rock layer width to get /6• 2 feet . <br /> required basal width; "' �. ,_ <br /> 2. 0 x /O f t �= 2 p f t h• Calcula'Ce �upsToPe dike wid th <br /> usin� upslope mound hci�ht <br /> H. Do�.�nslope Dike Sdidth and upslope dike multiplier <br /> 1. If landslope is 3% or more, -3 y� pag�, -18'��•-� f t <br /> -�L-- <br /> i. Total mound width is the sum <br /> subtract rock layer width of upslope dilce widtti plus rocl: <br /> from basal width to obtain layex, �.zidth plus downslope clike <br /> minimum downslope dike toe width width;� � <br /> Zo ft - /O ft = /Q ft /O. ,3 ft + lp ft +/�Zft =,�6, $ft <br /> 2. Calculate mound height at edge 3. If landslrs e��is''2,�9 ' ' <br /> oi rock layer on downslope side; P Percerie or <br /> less, basal. width i.ncludes betl� <br /> a . Determine d�pth of. �clean sand tlle upslope Zrid downslo1�e clil:c� <br /> i ill at upslope ed�e of rock widtl�s. <br /> layer: /. � feet <br /> b. *fultiply rock layer width by 1�. Calc,i�,l.ate do�anslope dike ea�icleli <br /> landslope to determine drop usin�; steps 11.2.a. Clirc>u1;h <br /> in elevation; i�•2.f; ' �feet ' � • <br /> /. D x � % = 100 = D. �f t b. Calculate upslope dike widtl� <br /> c. Add drop in elevation to depth usin� upslope mound lieigt�t rind <br /> of clean sand at upslope edge dike �mu�-t��lier 'f.�om Pafie �-18; <br /> of rock layer to get dep th of x f t = f t <br /> clean sand at downslope edge , c. Add downslopc dike width to <br /> of rock layer. upslope dike width to rock <br /> O.� f t + /, 0 f t = /. � f t layer wid th to ge l to ta 1 mound • <br /> d. Add depth of clean sand at down- width•. � <br /> slope edge to depth of rock ft�+ ft + [t = [c <br /> layer to depth of soil backfill —' <br /> to get mound •height at downslope �• Compare total mound width �c� <br /> edge of rock layer; required basal widt:h from scep <br /> /�ft +,75 ft +/.1Sft =3.Y ft G.4,. If tot�il mound width is <br /> � greater than requircd basal. <br /> e. Enter table on page E-18 with width, use ca.lculatecl dike <br /> landslope and downslope dike widths. If required 1��;>a.l <br /> ratio. Select dike multipli�r width is �;reater than eoc:�l <br /> of y 7 6 mound width, increase downslope <br /> Y' � f�O�F dike width... �' <br />