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. .,%- .TF•v1F.v Nam F� <br /> :; � BFl�h'✓gym (RF-oEj,G,�. <br /> Fox 7 BFo.Wors� E-20 <br /> MOUND DESIGN PROCEDURE (Continued) �Cd ES/GN <br /> (For Flows up to 1200 gpd) <br /> G.3. Calculate basal width ratio 11.2.f. Multiply dike multiplier by <br /> by dividing rock layer downslope mound height to get <br /> loading rate of 1. 20 gpd/ft2 downslope dike width; <br /> by allowable soil loading S, G x 7 = Z o, 6 ft <br /> rate; <br /> 1. 20 gpdi f t2 - Q,S�pdi f t2 2,Z10g• Compare the value: of step if. 1 <br /> and step 11.2. 1. Select the <br /> Checkthis.•val1..ue on page E-16. greater of the two values as <br /> 4. Multiply basal width ratio by the downslope dike width; <br /> rock layer width to get 2o, 6 feet <br /> required basal width; h. Calculate upslope dike width <br /> Z,W :c /D f t = 2Ydf t using upslope mound height <br /> and upslope dike multiplier <br /> H. Downslope Dike Width . <br /> .f <br /> e 3rom page <br /> 1. If landslope is 3/, or more, i. notal mound width is the Sum <br /> subtract rock layer width of upslope dike width plus rock <br /> from basal width to obtain layer width plus downslope dike <br /> minimum downslope dike toe width width; <br /> Zelo fc - /Oft = Iz!o ft = <br /> 9, Lf t + 16 f t +2G_�f t L/O f t • <br /> 2. Calculate mound height at edge 3. If landslope is 2.9'percent or <br /> of rock layer on downslope side; less, basal width includes both <br /> a . Determine depth of clean sand the upslope and downslope 'dike <br /> fill at upslope edge of rock widths. <br /> layer: / feet <br /> b. 'Iultiply rock layer width by a. Calculate downslope dike width <br /> landslope to determine drop using steps i1.2.a. through <br /> in elevation; 11.2.f; feet <br /> /D x 7 % 100 = 4.7 ft b. Calculate upslope dike width <br /> c. Add drop in elevation to depth using upslope mound height and <br /> of clean sand at upslope edge dike multiplier from Page E-18; <br /> of rock layer to get depth of x f t = ft <br /> clean sand at downslope edge c. Add downslope dike width to <br /> of rock layer. upslope dike width to rock <br /> L, 7f t + / f t = /, 7` f t layer width to get total mound <br /> d. Add depth of clean sand at down- width; <br /> slope edge to depth of rock ft + ft + ft ft <br /> layer to depth of soil backfill d. Compare total mound width to <br /> to get mound height at downslope <br /> edge of rock layer; required basal width from step <br /> G.4. If total mound width is <br /> /. 7 f t +. I f t + I f t = 3,7 f t greater than required basal. <br /> e. Enter table on page E-18 with width, use calculated dike <br /> landslope and downslope dike widths. If required basal <br /> ratio. select dike multiplier width is greater than total. <br /> of mound width, increase downts1.opcc <br /> dike width. <br />