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1; 20 <br />MOUND DESIGN PROCEDURE (Con Linuud ) <br />(For Flows up to 1200 gpd) <br />Calculate basal width ratio <br />•Oy. dividing rock layer <br />leadirg rate of 1.20 gpd/ft2 <br />+able soil loading <br />i t2 :0.fogpd/f t2 - 7 0A <br />�._ this value on page E-16. <br />4. Multiply basal width ratio by <br />rock layer width to get <br />requ,red basal width; <br />j.I0 x V ft - O.Oft <br />H. Downslope Dike Width <br />1. <br />2. <br />If landslope is 3% or more, <br />subtract rock layer width <br />from basal width to obtain <br />minimum downslope dike toe width <br />70 ft - /0 ft - eft <br />Calculate mound height at edge <br />of rock- layer on •+oanslope side; <br />a. Determine depth of clean sand <br />fill at upslope edge of rock <br />layer: / feet <br />b. ?:ultiply rock layer width by <br />landslope to determine drop <br />in elevation; <br />/O 9 % = 100 -O..'9 f t <br />c. Add drop in elevation to depth <br />of clean sand at upslope edge <br />of rock layer :o get depth of <br />cles: sand at downslope edge <br />o? -ock 1: <br />ft <br />d. Add depth . ' mean sand at down- <br />s_or edge to depth of rock <br />laver to depth of soil backfill <br />.o get mound he: •'1• ,t downslope <br />adge of rock la} , <br />/. 9 f t +Q, /Sf t+ /. 2Sf t d'LLf t <br />e. :Entat table on page E-18 with <br />':lndslope and downslope dike <br />:io. Select dike ,n:, _ipl ier <br />11.2.f. Multiply dike riultiplier by <br />downslope mound height to get <br />downslope dike width; <br />x 3. ? = /6.0ft <br />g. Compare the vr - of step 11.1 <br />and step 11.2.f. Select <br />greater of the two vi2 tlt: <br />tho downslope dike widtl- <br />/6. O feet <br />h. Calculate upslope dike wide., <br />using upslope snound <br />and upslope dike multiplier <br />from page E-18; 7f e <br />i. Total snound width is the :;ua, <br />of upslope dil •.?idth plub ruck <br />layer width t, !ownslope d i :e <br />wid th ; <br />7.1ft + 1/ ' ft +?.fOfL = .;}: l:t <br />3. If land lone is 2.11 or <br />less, basal width incluti,::; b(:Lh <br />the upslope and doa:n::lo;,. .! site <br />widths. <br />a. Calculate downslope dil:tr <br />C sill;; sCCpr ) il. L'11:u11{;11 <br />11.2.1; feet <br />b. Calculate upslope dike width <br />using upslope mound ht..;ht and <br />dike multiplier from Pa -18; <br />>: ft = fL <br />c. Add •lownslope dike <br />it'.CI1 Li: <br />: _r width to f'vt <br />L •i• r <br />d. C0111;.ara total mound ::'_tiLl. to <br />requii i b '.: ici <br />G.G r .total <br />than rcyui.' ei! <br />« , .. 1st .alculi:cc •t :li::•. <br />widths. If req,:i-ed 1^.oil <br />widt.11 .. grc.. : .. <br />mo%snd width increliucs L1uu1• :1ajau <br />di!:n widttl <br />