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E-20 <br /> MOUND DESIGN PROCEDURE (Continued) <br /> (For Flows up to 1200 gpd) <br /> • i <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 f t <br /> rate; <br /> 1.20 gpd/f t2 =O._Sgpu/ft2 =2. �O g• Compare the values of step H.1 <br /> and step H.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 feet <br /> required basal width; h. Calculate„upslope dike width <br /> 2, td0 x /O ft =ZY.Oft using upslope mound height <br /> and upslope dike multiplier <br /> H. Downslope Dike Width from a E-18• <br /> 3 . %1 � _ ;A0,3 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 width; <br /> ZY ft - eft =/%0ft /rj;�ft�+ y0 ft +, d:yft =36.5ft <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 dike <br /> fill at upslope edge of rock widths. <br /> layer: /. O 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; H.2.f; feet <br /> x % 100 =Q, Yft 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 /> Q, '//ft + /, e)ft = � 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 /> . required :basal width from step <br /> edge of rock layer; <br /> C +�7 -ft +/,25ft =3. 4 ft G.4. If''total mound width is <br /> /L Z_/ <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 /> dike width. <br />