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�� hFi>�c:c9/ji <br />E-20 <br />MO= DESIGN PROCEDURE (ContiL •red) <br />(For Flows up to 1200 gpd) <br />G.3. Cal=ulate basal width ratio <br />by dividing rock laver <br />loading rate of 1.20 gpd/ft2 <br />by allowable soil loading <br />rate; <br />1.20 gpd/ ft2=O.SOgpolft2 = L" YO <br />Check this value on page E-16. <br />4. Multiply basal width ratio by <br />rock layer width to get <br />required basal width; <br />j.yo x /C ft-2Y.Oft <br />H. Downslope Dike Width <br />1. If landslope is 31 or more:, <br />subtract rock layer width <br />from basal width to obtain <br />minimum downslope dike toe width <br />ZdE.7 ft - ' % ft -AC 7 f t <br />2. Calculate mound height at edge <br />of rock layer on downslope side; <br />a. Deteraine depth of clean sand <br />fill at upslope edge of rock <br />layer: /.O feet <br />b. Multiply rock laver width by <br />landslope to determine drop <br />it: elevation; <br />x %100 =✓.7ft <br />c. Add drop in elevation to depth <br />of clean sand at upslope edge <br />of rock layer to get depth of <br />clean sand at downslope edge <br />of rock 1.,.er. <br />7ft + ,eft 7 ft <br />d. Add depth of clean sand at down - <br />slope edge to depth of rock <br />laver to depth of soil backfill <br />to get mound height at downslope <br />edge of rock layer; <br />/._7ft +.'. ft + /. ' ft 7 f t <br />e. hinter table on page E-18 with <br />landslope and downslope dike <br />ratio. Select dike multiplier <br />of 5. `✓lS Y. <br />I1.2.f. Multiply dike multiplier by <br />downslope mound height to get <br />downslope dike width; <br />S,S6xZ.Z= 06ft <br />g. Compare the values of step H.1 <br />and step H.2.f. Select the <br />greater of the two values as <br />the downslope dike width; <br />ZY. D feet <br />h. Calculate upslope dike width <br />using upslope mound height <br />and upslope dike multiplier <br />rom page E-18; 9, y f t <br />X X, 0 - <br />i. Total mound width ib the sum <br />of upslope dike width plus rock <br />layer width plus downslope dike <br />width; <br />c%, /ft + /4; ft + Vft-VJ.yft <br />3. If landslope is 2.9 percent or <br />less, basal width includes both <br />the upslope and downslope dike <br />widths. <br />a. Calculate downslope dike width <br />using steps H.2.a..through <br />H.2.f; feet <br />b. Calculate upslope dike width <br />u:;ing upslope mound height and <br />dike multiplier from Page F.-18; <br />x ft = ft <br />Add downslope dike width to <br />upslope dike width to ruck <br />Layer width to get total mound <br />width; <br />`ft + - _ft + _ft = _ft <br />d. Compare total mound width to <br />required basal width from step <br />G.4. If total mound width is <br />greater than required basal <br />widt:i, use calculated dike <br />widths. If required basal <br />width is greater than total <br />mound width, increase downslope <br />dike width. <br />