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4b
<br />anticipated in the landfill to select an appropriate value the biological clogging reduction
<br />CRJ-GC8 recommends using values in the range of 1.3 forleachate collection system (see Table +.+;. The should e
<br />Chapter.4.- Design s And Concepts
<br />clogging in the
<br />the conditions
<br />is urged to a conseryative
<br />to 1"3 for ologging in the
<br />Id evaluate the ditions anticiipated
<br />I clogging factor. In the
<br />a conservati value (i.e,, I "3).
<br />stress. For this
<br />The GSE Drainage Design Manual
<br />718 (r5
<br />factor" In the absence of available information. the
<br />value (i.e", 1.3).
<br />Gzu-GC8 recommends using values in the range of 1.
<br />lea\age detection sysrem (see Tible 4.4). The Oesig-ner sho
<br />in the landfill to select an appropriate value for t['e biol
<br />absence of available information, the designer is urged to
<br />4.3.4 Creep Reduction Factors, RFc,p
<br />Performance transmissivity tests are typically. conducted,forf up to 100 hours, as required b), GRItest procedure GC8' The deorease in transmissivity with tiine levels off witirin 100 hoursr, andusually rnuch sooner than that, indicating that mucir of the lnitiur and intrusion hasalready taken ptace (.see-Figure 2.5). Recluotion rootor ror
<br />"Ju.p, i[,;;;;l;tJro, tr," decreasein transmissiviry beyond the first 1b0 hours covered tt tdp;rformance'r !rqrrnuuuilYrty uv.yulr(r ule rIrS[ luu nours covered by the performance tran$missivity test. The
<br />9"ualfry of the geonet core, including its strucrure, irri"r.Jilrr,-;; ;;t d;nJrv "un herve ay: *':- T*:::: f f "T:L l* gry,i,-"1_t.t"o. r"6 r* ;. il;#";.;_;factols forgeonets manufacture{uv cfn Lining Technology, tn". rrdluci;fiil;i,;rl*u*a"rureris canhave- creep factors different from thosi given here.
<br />Regardless of the ppe of product, cieep increases with ir -u/pe ul procruc[, creep lncreases with ipcreasing overlbureason, creep reduction factors for covei applications (i.{., cover drainagvrvvt/ rvuqwtrvrr r'lul'urs ler oover appllcatlons (i.9., cover drainage{ and gaS removal
<br />fff].,T,:i$l*:Tlv^'T1lgl!an.jhos^e r; h1g.,)"tJ*'lipprirurions (i.e.l LCRS and LDS).
<br />*:,:*:-" fl:l]."X:l:,1T:*! l*duction fb*or.of.r.rit;J4qffi;;;;;J"+;pdilil t;#;reduction factors should be selected on the uasis. oi;;#;f;;;;"fb;;bts''^iJinl$. Xconservative value of creep reduction factors may be 2 fbrld;irilitto rilr.T'r *irh overburdenstress ofup to 15000 psf.
<br />'Iable 4.5 Creep reduction factors (M.*) for geonets red by GSJE ing Technology,
<br />Inc.o and Al
<br />4,4 Seepage Forces and Cover Soit Stability
<br />The selection of a geosynthetic drainage larer iq the previolls section (secticin 4.3) was bcrsedsolely on impingement rate (q) andlhe resulting require[ ffansmissiv ity, o,u,q.The us* 'fEquation 4'24 for calculating aiiowable *ansmissivity wourd pnsure that liquid head stays wi,rhinthe drainage laver, i'e', all percolation is adequateV rt""Jr-J uy irr* Jruiiuufifi*r. Relative to
<br />::"ff , :3:' [?; J[HH::;H,, ttf m;1ffi;f " ;";;; ;;.,p"sf
<br />*ii,,"
<br />", n ee d be
<br />Page 4-16
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