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T � <br /> -VA 7 Bfo"ars) Ii-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 p <br /> loading rate of 1. 20 gpd/ft2 downslope dike width; <br /> by allowable soil loading S. 5'�- x,". 7 Zo, ( f t ` <br /> rate; <br /> 1. 20 gpd/f t2 - Q.SL,.gpui f t2 = Z.t/a g• Compare the values of step <br /> and step 11.2. 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 ZO, 6 feet <br /> required basal width; h. Calculate upslope dike width <br /> 2,'0 x /D f t = 2Vof t using"upslope_.mound height <br /> H. Downslope Dike Width and upslope dike multiplier <br /> .f <br /> 3 *2 pag �eE-18; q 4 ft <br /> 1. If landslope is 3/ or more, i. Total mound width is the Duni <br /> subtract rock layer width of upslope dike width plus rock <br /> from basal width to obtain layer width plus downslope dike <br /> minimum doionslope dike toe width width; <br /> 2 11/.0 f t - /Oft = /S!O f t 9, Lf t-+ /0 f t +26.6'f tf t <br /> 2. Calculate mound height at edge 3. If landslope is 2.9 percent or <br /> of rock layer on downslope side; less, bq.sala, widt}i includes both <br /> a . Determine depth of clean sand the upslope and downslope dike <br /> fill at upslope edge of rock widL11S <br /> layer: ,/ feet <br /> b . Multiply 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•P';' feel <br /> /O x 7 % 100 = 0,7 f t b. Calculate upsld�,e dike width <br /> c . Add drop in elevation to depth <br /> 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 /> 0, 7f t + I ft = 1, 7 ft layer width to get total mound <br /> d. Add depth of clean sand at down- width; <br /> slope edge to depth of rock —f t + —f t + —f t = ft <br /> layer to depth of soil backfill <br /> to get mound height at downslope d. Compare total mound width to <br /> edge of rock layer;• required basal width from step <br /> 7 ft +• JVft + ..*# ft = 3,7 ft 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 greaLer than total <br /> of 5. 56, y;/ mound width, increase downslopc <br /> dike width. <br />