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!f.^V <br />?!•; <br />W^'p.--..!r+-. •fe.' <br />- <br />■K i-r: ■'m <br />lit- <br />•• ik <br />*- .-i <br />■••:a <br />mm <br />i.-'■»•■--' ■ <br />I <br /># <br />R <br />t-20 <br />MOUND DESIGN PROCEDUT.E (C. n :inue-J) <br />(For Flows up CO 1200 gpi) <br />G.3. Calculace basal widch racic <br />by dividing rock layer <br />loading rate o. 1.20 gpd/ft^ <br />by allowable -jil loading <br />race; <br />1.20 gpd/fc2 -^.<^pd/ft^ - <br />Check this value on page E-16. <br />. Multiply basal widch ratio by <br />rock layer width to get <br />required basal widch; <br />2 • O X /Of £c ^20 fc <br />H. DovTislooe Dike Widch <br />1 If landslope is 37, or more, <br />subtract rock layer widch <br />from basal widch to obtain <br />minimum do\^slope dike toe width <br />20 f C - /a fC • /O fc <br />Calculate mound height at edge <br />of rock layer on downslope side, <br />a. Determine depth of clean sand <br />fill ac upslope edge of rock <br />layer: /. ^ feet <br />b. Multiply rock layer widch by <br />landslope to determine drop <br />in clcvacion; <br />/J X c." 7. - ICO ^ 0,6 it <br />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 layer. <br />f t + /. ^f c « /.oft <br />. Add depth of clean sand at down- <br />slope edge to depth of rock <br />layer to depth of soil backfill <br />CO get mound height at downslope <br />edge of rock layer; <br />/.oft +0. ''Si c + /. fS f c “ 7. C i c <br />Enter cable on page E-13 with <br />landslope and downslope dike <br />ratio. Select dike multiplier <br />of ^6 y.* / <br />. ..... <br />IJ 'I <br />^ 4 • W « ^ •Multiply dike mulcipl:or by <br />doumslope mound heir->,t; jcc <br />downslope dike wiach; <br />S.i€ '■ 7j6 = /<P. J f: <br />3 Compare the values of step . I <br />-r.d step H.2.5. Eelecc the <br />greater of the two values as <br />the downslope dike widch; <br />/F. 7 ‘Get <br />h. Calculate upslope dike width <br />using upslope ~.ounci !ic:gi-.t <br />and upslope dike nultiplier <br />r* ^ ’ Q . <br />•• ». 4, t <br />7^ <br />1. Total mour.ci -•tdc!i is ciic sum <br />of upslope dike widtii >lus : ock <br />layer width plus Jcvnslope dike <br />i c! til * <br />?.7iz'- /O it -77.6iz <br />If landslope is 2.9 percent or <br />less, basal ’..-idch induce'' bet'n <br />the upslope and dcvnslope dike <br />'.vidchs . <br />a. Calculate dowv.slc"e dike x.'idch <br />US'."p steps H.l.a. L’.vounh <br />H . : . f ;too: <br />b Calculate upsdpc dike width <br />using upslope -riound height .'ind <br />dike multiplier from Page E-18; <br />f ^ a^ u <br />Add downslope dike width to <br />upslope dike widch to rock <br />layer width to get total mound <br />wid ch ; <br />fc+ fc+ fc= ft <br />Compare total mound width to <br />required basal widch from step <br />G.-i . I: cocnr mound Jidch is <br />grcat .r chan rccuired basal <br />wide:', use calculr4tcc! dike <br />widths. If required basal <br />widch is greater chan total <br />mound width, increase down.slope <br />dike width.