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..,...,E.-20 . <br /> MOUND DESIGN PRO EDURE (Continued) <br /> (For Flows up to 1 00 gpd) <br /> G.3. Calculate basal width ratio .2.f. Mul,tiply. dike multiplier by <br /> by dividing rock layer downslope-mound-height to get <br /> loading rate of 1.20 gpd/ft2 downslbp.e 'aik'e"width; ' <br /> by allowable soil loading .�, 53 x 3.S = /Z. `/ ft <br /> rate; <br /> 1.20 gpd/f t2 = gpd/f t2 = 2. 0 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 _ .2 ..V _feet, , <br /> required basal width; h. Calculate upslope+dike width <br /> Z, 0 x /O ft - 2p ft using upslop-e..mou•nd height <br /> H. Downslope Dike Width <br /> andupslopedike multiplier <br /> fro <br /> Xagg E_18; 7. f t <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 <br /> width; <br /> Zo ft - /O ft /Q ft 7� g ft + 1p ft +/2r.yft =30.2 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 midth. includes both <br /> a. Determine depth of clean sand the ups•lop'e and downslope dike <br /> fill at upslope edge of rock widths <br /> layer: /- O feet <br /> b. ?Iultiply rock layer width by a. Calculate downslope dike width <br /> landslope to determine drop using, steps 11.2.x. throus;h <br /> in elevation;" H.2.f; feet <br /> /.D x S % = 100 = O.Sft 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 mtiIti�-.ier'.TXom 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, 5 ft + /, 0 ft = /.5 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, tro� al-moi'und width to <br /> edge of rock layer; required basal width from step <br /> step <br /> A.1 f t +.75 f t +/.2.5 f t 5 f t 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 mound width, increase downslope <br /> 3:/ 1'CaPE dike width,,. , w- <br />