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`,-. 1; BFO '✓✓m _ �RF-oFr�G� <br /> Fox 7 BFo.�ars� E-20 <br /> MOUND DESIGN PROCEDURE (Continued) RC d ES/G�v <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 .S•,S'6' x .?. 7 = 20, 6 f t <br /> rate; <br /> 1. 20 gpd/i t2 -Q.SOgpd/f t2 2.1/O g• Compare the values of step 11. 1 <br /> and step 11.2. f. Select the <br /> Checkthis., value on page E-16. greater of the two values a;; <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 /> 2,'0 x /O f t = 2-y,Of t using upslope mound height <br /> and upslope dike multiplier <br /> H. Downslope Dike Width from page E-18; ft <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 /> 2,111.0 ft - /Oft = /'/Oft 9ft�+ IC ft +26.0ft <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 11.2.a. through <br /> in elevation; 11.2.f; feet <br /> /D 1 x 7 % = 100 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 ft = ft <br /> clean sand at downslope edge c. Add downslope dike width to <br /> of rock layer. upslope dike width to rock <br /> C. %f 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 /> /. 7 f t +• I f t + If t = 37.7 f t <br /> G.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 Z/:/ fGopc- mound width, increase downslope <br /> dike width. <br />