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• �EtilF� i�o� �,S <br /> �r BFO ✓GI1'I E-20 <br /> MOUND DESIGN PROCEDURE (Continued) <br /> (For Flows up to 1200 gpd) <br /> G.3. Calculate basal width ratio H.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 -5 •S6' x 7 = zo, 6 f t <br /> rate; <br /> 1. 20 gpd t2 <br /> Compare the values of step11. 1 <br /> /f - Q.S(�;pd/f t2 = Z.y4 g p <br /> andl step li. 2. f. Select the <br /> Check this value 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 1p, 6 feet <br /> required basal width; h. Calculate upslope dike width <br /> 2,`l0 x /0 ft = 2� oft using upslope mound height <br /> H. Downslope Dike. Widthand upslope dike multiplier <br /> -,from page E-18- <br /> LV f t <br /> 1. If landslope is 3% or more, i. Total 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 /> 0 ft - /0 ft = /S!O ft ?�J ft -I- /=- ft +2_6ft _ft <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. Multiply rock layer width by a. Calculate dovnlslope dike width <br /> landslope to determine drop using; steps 11.2.a. throuf;h <br /> in elevation; 11.2.f; feet <br /> /O x 7 % - 100 = 0.7 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 /> 0, 7f t + / ft = 67 ft 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 + f t = f t <br /> layer to depth of soil backfill <br /> td. Compare total mound width to <br /> o get mound height at downslope <br /> edge of rock layer; required basal width from step <br /> /. 7 ft +,75ft + /,2Sft = 3,7 ft C.4 . If total mound width is <br /> 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 J. S � �/:/ JGoPC mound width, increase downslope <br /> dike width. <br />