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<br /> <br />..... <br />tc <br />-J <br />c.. <br /> <br />rART V. flISTOMICAI. SALINITY (;UNUITIONS <br /> <br />A. Methods <br /> <br />SalinilY in the I.olorilrlo RivE'1 Basin i.<: mnnitOIf'd ill }O key .<::t<ltion~. <br />The average concent'"ations ann lna"!'; v('re rlf'tf'nninpd on ."1 flm: !Jeighled basi.... <br />using ddily c1ala '.:hpnevel possiblf'. 5;111 10;lIls aml ('Hflc{-ntrations ....pre <br />generally calculated from d.lily cOl1ductivity <lml flo'o' feCOlds using methods <br />developed jointly uel....een Reclamation and the USGS IRJ. <br /> <br />!lisrorical streamflolJ. salinity cnncf'ntrlitions. <lod salt IO::ld Oatil at 2/) <br />key Stations lor JOlllU.!IY 1941 thrOll/1;1I UeCL'ln!H..'1 19H7 alE.' JII('seoll'd ill T<lhJ~s 1 <br />through 2u at ti,e elld of rids lepUI t. F"JgIlH> V-I 51.0....s the hJstodcal <br />salinity at Impel ial Oam. <br /> <br />H. IIistorical Salinity <br /> <br />Salinity concentrations at Imp~rial Dam rlecr(,<l~(>d sle.Hiily from 1rnO~79, <br />dropped notilbly in lQB!). ill('/(~.l"'f'd sh.uply in 1'1Hl 87. ,HId dl-opp{:d again in <br />1983_8". The 197080 s.fllillilY cnnC('lltraticlIls ~hov the butf(>ring of anllll.l] <br />flUCIU<-ltion.c; ill s<llinitips riue ro thp etft:>Cf of nP.lrly 50 million o'lcre-feet of <br />lesclvoir storage. lJith rtlf' re'<:Plvni! sror"p't' in the Col{Jlildo River i't! fJe<ll" <br />capacity, disc:hal-g('s from linnv('r /Jam inrrt.'a<;f>ri tlnm 7.7 million ane fpPI in <br />19791011.1 million acre It'd in ]QRo (seE' FiglllC' V 2), diluling the salinily <br />at lmpelial Dam tempol-,uily. \lith mOIl' nOlmal tlovs ill Iqal and 1YR], the <br />salinity r('bounded. HigtJ('1 rplt:ases trom lluovcl- dllli Glel) CilnyoJ1 Dams in 1983 <br />and 1<)8", combirlprl ....irh 10'-'(>1 s.'lliniries in stol,lgt>, c;wsPri -":,,linityat <br />Imperial Dam 10 chop ilgain. iiirh the rWillly 50 mil1iun acre-feet of high <br />qU.11ity Valt'r ill stol.lge and the r{'l.Hively high runoff in the Basin, <br />sal ini ties at Impel ial [Jilm remained 1m.' thlllUr,h IQR6 and 1'JH7. !JudE'!" avera.v.e <br />hydrologic conditions, salinilY \Jould h"vp beel1 about 8J() mg/L; hovever, as <br />long as the runoff n'milins high, salinity '...ill lE:'main 10'-', <br /> <br />c. faclors in Salinity Tr~~lds <br /> <br />The do;;nvard fluctlliltinll of s.11inity af lmlwl i"l O.1m rilll illg the lQ70's i<: <br />;;irhin the expeC'tcd 1'<'Ing!? <l1ll1 ":,1S Simlll.ltf'O ll!':inr. thp C01orado Rivt>r <br />Simulation Sys((-'m (CRSS). a complltf'l model of th~ COIOI,ldo River Basin. <br />Several Llctors complicitle the analyc:is lit the dec"lint' ;llld l('velin~~ off of <br />salinity concentratiolls. ~osr of [hesCo' .11P. modelf'd w;ing CRSS anrl include <br />variations ill runoff. rt:.'ser'Joil- SIOlilg(>. IPselvoit npeJillions. salt pirkllp, <br />and depletions due 10 dev('lnpmPllt of the Basin. These. ilnd other facrol's. <br />vhich may Cdllse shifts ill salinity. ilre discusseo in the follc'l\,dllg sections, <br /> <br />1. !!rdro1of,'ic Condilions <br /> <br />The salinity rr'nrpnrralinn in ! iVP1'~ grJIPI.1lly decreil5Ps ~irh <br />increased tlo;; 011 all ilnllllal basi... j"P.lrS 01 IO'Jl'I flo'.'<: :\lP ch"lacrl?rizN! hy <br />hi~her salinity COlICt?llllil.tion-: th.1f1 Yt.-,HS of Ilip;hf-r flolol<:. CCHnhining this <br />charact€'"lislic vith the l.lg li~e in Ilw IE' l"I'/Oi, system ht'ro'lIlSf' of storagf' <br /> <br />v <br />