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<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 /> <br />19 <br /> <br /> <br />