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E-20 <br />MOUND DESIGN PROCEDURE (Continued) <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 dou•ns.lop, mound height to get <br />loading rate of 1.20 gpd/ft2 downslope dike width; <br />by allowable soil loading S.2C x ,�,� _ /�. 9 f t <br />rate; <br />1.20 gpd/f t2 - g9.Apd/ f t2 = 1. D 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 / ,?. 9 feet <br />required basal width; h Calculate upslope dike width <br />2- O x /O f t =_f t using upslope mound he-,ght <br />and upslope dike multiplier <br />H. Downs_i ope Dike Width and <br />a e r•-18; <br />1..s X�=�Zft <br />1. If landslope is 3% or more, i. total mound width is the sum <br />subtract rock layer width of upslope dike widtlil�lus rock <br />from basal width to obtain layer width plus downslope dike <br />minimum downslope dike toe width width; <br />20_ft - /p ft = /p ft 9.7ft + /D ft +/p9ft =.?86ft <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 .'ike <br />fill at upslope edge of rock widths. <br />layer: /. O feet <br />b. Multiply rock layer width by a. Calculate do%.nislope dike width <br />landslope to determine drop using steps H.2.a. through <br />in elevation; 11.2.E; feet <br />x d % - 100 = l%.6 f t 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 />0. b ft + /. Of t = 1.6 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 backf ill — <br />to get mound height at downslope d• Compare total mound width to <br />ed e of rock layer; <br />required basal width from step <br />�.Yft +J."5ft +1.25ft =.7.6ft 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 6 y mound width, increase downslope <br />dike width. <br />