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� �E•v1F� NOM <br /> 6FDRo�m s (R6-oFr�c� <br /> E-20 <br /> caX 7 960.war5) <br /> MOUND DESIGN PROCEDURE (Continued) #fCO ES/GN <br /> (For Flows up to 1200 gpd) <br /> G.3. Calculate basal width ratio 1i.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. G7 = 20, ft <br /> rate ; <br /> 1. 2U ud/it2 -4�.Sf%pii/f t 2 = Z,yO g. Compare the values of step 11. 1 <br /> and step 11.2. f. Select tile <br /> Check this•,value on page E-16. <br /> greater of the two values as <br /> 4. Multiply basal width ratio by the downslope (like width; <br /> rock layer width to get 2o, 6 feet <br /> required basal width; h. Calculate upslope (like width <br /> 2,W x /D f t = 2-'j!Of t using upslope mound height <br /> and upslope dike multiplier <br /> H. Downslope Dike Width from page E-18; <br /> 3- 12 x �_ = q. q 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 clike <br /> minimum downslope dike toe width width; <br /> Zy0 ft - /D ft = /Y.O ft 9�ft + /C ft +2G_6-ft = qO 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 beth <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 downslope dike width <br /> landslope to determine drop using steps H.2.a. through <br /> in elevation; 11,2.f; feet <br /> /0 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 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. 7f + / ft = 47 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 + ft = 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 +, I ft + .## ft = ,?,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 greater than total. <br /> of 5. 5-6- 'j/:/ J410p16 mound width, increase downtn ope <br /> dike width. <br />