<br />
<br />
<br />IS estlmCttecJ thilT average ilnnualecOflomic deTriments
<br />WOuld InCreCt~ 10 528 million In 1980 dnd 55' million
<br />m 2010 Mort rhein aD percen! Of These detriments
<br />WOuld bt- IIlCurrt.'d by Irr/9<lted a9rtcullure itrld lhe
<br />aSSOCiated leglonal economy lOCated In the lOwer
<br />Baslll dnd lhe SOulhern Cdl"orrlld \'oCtT!.', 5E'rvlce area
<br />The munIcIpal d!OTnmenrs ....l're based On lh.,
<br />Cdlculallan 01 add,tloll.." SOap allU rteterg"Il'
<br />reQUlremellts, Only
<br />
<br />c,.,
<br />C
<br />/"
<br />r...
<br />
<br />qualIty prOblem tfJ the COlorado Hlver BaSin,
<br />Sdlr-1oddFng dlld Salt-collcenrratmg eflecls of
<br />consumpIIV(' use 01 dl'Pletion art' the pr,mary c.lust's of
<br />salllllly Ine/east's. Sail 10dd'/1g princ,pally reSults from
<br />:>.ara conlllbuted frOm d,l/use and pomT SOUrCt?s Of
<br />geOlog,C Orlglll a'ld frOm salts carr'ed !/l Irrlgalion
<br />'!Olliff"! flows.
<br />
<br />The InveS!lg""On e.o:dmlfJed Ihree sal'nllY COntrol
<br />dITerrldl,vl'S (J/ augrnenldtion 01 baSin Water SUPPly.
<br />(2) basmw,dt> Sillt load redUction program, and (3)
<br />lim/Taf'on On fUrfher depleTion of basm waTer SupplV,
<br />Thl' Slud'f COncluded lhal the Silll load reduCllon
<br />program appeared to be Ihe mOSI teas/ble of the three
<br />il1Ie/n..tlves. II then prOceeded 10 develop il brOild
<br />conceptual plan dnd reldled COsts for Such il Plogram
<br />
<br />LOWER COLORADO REGION COMPRE_
<br />HENSIVE FRAMEWORK STUDY (WRCJ
<br />
<br />Th,~ Il:-POIl tJy the Water ResourCt's COunCil dilTed June
<br />J971 Stoilll's rhal high levels of diSSolved mineral :>.aIls In
<br />sUlfdce drtd grOund ....aters are the major WilTer QUill'Ty
<br />prolllem III Ihe 'eglon. W'lh leI'.' t'JI'Cepl'ons, mOsl
<br />SUlfilce. dnd ground'waler Suppl,es have mllleldl
<br />concenrrations t'.o:Ceel1'ng 500 mgil, and mat,y e.o:C~ed
<br />1.000 mg/I. The sal'nlTy of The SUpplies dfff'CIS
<br />domestIC. induSlrial, an(J d9rrCUltu'ill uses.
<br />
<br />The COIOlddo RIver enters the region ilt COnCenlraTions
<br />eJl'Crt'djng 500 m9/I. Vdr'eS bel....een 500 dn,l 900 mg'l
<br />at mOSl d'vt'rSlon PO'nts. dnd ine/eases 10 as hIgh as
<br />1,000 10 1,150 mgl/ lor Very sho,! Per'ods 01 lIme al
<br />''"Pt-'rldl Oil'll. Salinity FIlCreases ,n The COlorddo RlVer
<br />Irom Lecs Ferry. ArilOna, to Imperial Oilm aft' due
<br />PlillC1DaHy 10 FIlPuts Irom :>.aline springs and Iht'
<br />COncenTrilr'ng effects of consumpl've use and rt'S'.'rvolf
<br />e~alJOrat'on.
<br />
<br />O'sSOh'ed sOI.ds COnce'lfrarlons rn the ColOrado RIVCf
<br />dfC estlmilted 10 Increase dbout 55 to 75 percent
<br />belween 1965 dnd 2020, wlrh rht' eXCept,on of
<br />Imperlill Dam where rhe COncenTralion IS esrlm,Hed 10
<br />dOUble. Th~se resulrs dre based On the assumPl/OllS rhdt
<br />lhe Ct'nltill ArllOfla PrO/eCI is in operilTlon and no
<br />sillinlly controls a'e meorPOrdled III IUlure
<br />devefopments.
<br />
<br />UPPER COLORADO REG/ON COMPRE.
<br />HENSIVE FRAMEWORK STUDY fWRC/
<br />
<br />The repOrr lly the Woller Resources COuncil dated Jun('
<br />1971 Sldtes thar Salmiry IS the mOn seriOus Water
<br />
<br />FUlurt' dlSSOlvt'd sol'ds COnCPnlrallons were estimaTed
<br />tOr 1980, 2000. and 2020 The TOS COI1Centriltion ar
<br />Ll'es F""y, Ar'lond. aSSuming no sallnlly 'mprOvemenT
<br />P,ogram, /s pro/eCh?d .01820 mg/I lor the yedr 2020, Or
<br />40 PI!'Cl'nr grealer thilll Ih... 1965 concentrdTlon, The
<br />ma,o, CdUse of Ih., ProJecred s.llinlfY mCleilse IS
<br />COIlfmued development 01 the regiOl1. It includes lhe
<br />ad{11tlOllal Slream cll'p1ellOfls for Irrigal'on, Thermill
<br />POWer prOduCf'on imd eXPOrt, <Inti the dddlT'ondl sart
<br />le<lChed Irom nl'wly Fff'gdted lands.
<br />
<br />State dlld Fedt'rdl representat,ves in horh Ihe upper and
<br />10\",e/ COlorado reg'Ons agreed Ih"r Ihe salrnilY
<br />ImproVl'mf'nl Pl"ograms Outlmed in thl' Upper and
<br />lOW.,r COlolildo F'dmeWOlk Sludy documents should
<br />be Parr of <I bdslnwlck ilPPrOach ro salilllty
<br />fl'lill1ilgemenl. The ~dlin'ry 'mprnvemel'lI prag/am
<br />COnS/SIS 01 il salt./o<<l,ng leductlon progrdm which
<br />fT1c11f1la'ns conCentrdtlons ilr lees Ferry ilT abOUT 600
<br />Illg/1 thrOugh the year 2020.
<br />
<br />'"I-. I I', '\FOIUJ.'".,\.,. CO\""'.HI'.\n,
<br />
<br />The ScVC/111l Sess'on of rht' COnlerl'lIce In Ihe Mdfll'f 01
<br />POIJutlon of rhe InterSldle WaTers Of lhe COlorado
<br />R'ver dealr pr,milrll.,. Wlfh Ihe ~d!rn'ty 'SSUe The
<br />confNenet' was held under Ihe prOviSIons of SeCtlOIl 10
<br />01 Ih", Federal Wall:'r PO!JUr'on Conrrol Acr which
<br />dlllhOf/led lhe EPA Admlfllstrillof 10 lnlt'i1le such a
<br />conft'renCl! ....hen repOrts Or Sfudles show Ihdl pOllUTion
<br />subJeCI 10 "hdlement undel Ihe Fed!!ral ACI IS
<br />occurlll1g In thiS c.>se, The previOUsly deserl/led 1971
<br />lepor[ by Ihe EPA on "The Mmeral QUilli!y PrOblem 'n
<br />th!! Coforado RIVer Bas'n" was Used dS Ihe bdCkup
<br />STudy. The COnference was held On Fetrrudly 15'17,
<br />1972 and Wil~ eonlmued and concluded on April
<br />2&27. 1972.
<br />
<br />COIlCIUSlons dnd ,ecomrnendalofls of the enfortt'mel1t
<br />conference w'!'re reached undnlmousl". by COnferees
<br />represenl'ng lht' seVen 83sm Slales a'ld rhe Fedelal
<br />Government_ They were;
<br />
<br />.'/. It is recommended Ihat A salmlrv pOlicy be
<br />adopred for thl:' Colorado R,ver SYstem thar WOuld
<br />havl:' ..s Its obJeC1IVe rhe mamtenance of salinity
<br />
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