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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 y, �'� x /6. 2 f t <br /> rate; <br /> 1.20 gpd/f t2 =0.6'Ogpd/f t2 = ,� o g• Compare the values of step 11. 1 <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 le. 2 feet <br /> required basal width; h. Calculate upslope dike width <br /> 2. y0 x eft =2 Y.Oft using upslope mound height <br /> and upslope dike multiplier <br /> H. Downslope Dike Width rp�n�,page �E,18 <br /> 1. If landslope is 3% or more, x 5 = '/0 f t <br /> 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 ZA1width' <br /> ft - /p ft = ��/ft A&C/ft + /O ft +/0 2 f t =36.eft <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 beth <br /> a . Determine depth of clean sand the upslope and dov:nslope dike <br /> fill at upslope edge of rock widths. <br /> layer: / feet <br /> b. "Multiply rock layer width by a. Calculate dowilsl.ope dike width <br /> landslope to determine drop using steps H.2.a . through <br /> in elevation; H.2.f; feet <br /> /O x �_% = 100 =O. y 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 r c. Add downslope dike width to <br /> of rock layer. upslope dike width to rock <br /> a- f t + /. O f t = �, 7 layer width to get total mound <br /> d. Add depth of clean sand at down- width; <br /> slope edge to depth of rock ft + f t -+- ft ft <br /> layer to depth of soil backfill <br /> to get mound height at ,downslope d. Compare total mound �.�icltll to <br /> edge of rock layer; required basal width from step <br /> /�/ft +Q,7Sft +/,ISft = ��Ift 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 /> i ratio. Select dike multiplier width is greater than total <br /> of yi 76 A/ mound width. increaen downelopo <br /> dike width. <br />