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<br /> <br />IV <br />--J <br />0) <br /> <br />Ca:JSi'5 3'11 J.7'oaCIS of Sa"m,~ <br /> <br />.. <br /> <br />pOpU[J.llon lncrCJse. ~1&1 source... ""ill be mcreJ.~lOg '<ll1ml) by approximately 1.'t.\OOO (on, per <br />year by the year :!OIO. Ho....c\cr. mo'! mUnlclpal .....a,IC" are relau\ely lo\\. In ,.tIt concenlr.nion In <br />companson vdth nalUrJ!. mdusrnal. and agncu[tural "ource~ Complete ellmlnallon of ..uch ....aqc <br />dl\,harg.es ""auld be' c\pen!\I\C' v.hen compan~d to other \ahml) control method, <br /> <br />Consumptive Use of Water Increases Salinity <br /> <br />Addlllon of ,,:llts (0 the nver "yslem IS. nOl the only cau'iC of mCTc.l\ed sallmty In the Colorado <br />RI\er Sa'ln. The consumption Ideplctlon) of ",aler reduces the dilution of sahne mflows. to the <br />n\cr system. Increasmg the concenlrallon of salinity \\';1Ier u\e h c\aIUJ.lcd a... pan of <br />Reclamation', re...pon\lbllltlcs In managing the fiver ~y<;tem_ The Colorado Rin'r 8dSm. <br />C(I/l.mmpti~'t' Uus and uHses Reportl-1J ,ummarile-s WJter use In the Ba<;ln. Table 1 summanze) <br />the- Basin u'es for 1981-S5. including tnbutJne) to the Colorddo Rh-er in the Lower Basin. Wor].,: <br />is under....a~ to update Ihese eSllmale<, <br /> <br />Table 2 -Waler use In the Colorado River BaSin (1981.85 average) <br /> <br />Tolal <br /> <br />Upper Basin use lower BaSin use <br />(1.000 al/yr)' (1.000 al/yr) <br />81Z 1.255 <br />2.312 5,101 <br />203 84' <br />0 30 <br />689 4.063 <br />3,996 11.290 <br /> <br />TVpe 01 use <br /> <br />ReservOir evaporation and Channel losses <br /> <br />Agricullure (Within baSin) <br /> <br />M&1 <br /> <br />Fish. wlldhle. and recreational <br /> <br />Transbasln exports <br /> <br />'Acre.teet per year <br /> <br />WlCh the ellcepllon of the Central Anzona ProJec!. the Lo....er B:mn has already developed mos.t of <br />Its WOller ~upply'. CAP is the last major de\'elopment to deplele water from the Lower Colorado <br />Ri\er (Jpprolllmalely 1.5 million acre.fect per year). Agncullure use IS Ihe Single largest '.curce of <br />depletIOns to the Colorado Ri\'er. Expons. reserVOIr evaporallon. J.nd ~1&1 uses aho account for <br />Ie..<;er bUI significant depletions. <br /> <br />~Iost of the expom from the Cpper Basin J.re made al higher elevations ....here the salinity <br />concentrallons are vcry 10.... nl1S loss of high quality "ater results in the remaining 00W5 <br />do....nstream becoming more concentr::l.led. Water ellported from the Upper Basin dunng the penod <br />19'+1-71 J.\'eraged about 360,OCXl acre-feet per year. Complellon of such large projects as the <br />Colorado-BIg Thompson. Duche<,ne Tunnel. Roberts Tunnel. J.nd more recent projects Increased <br />ex-ports 10 300Ul 669.000 acre-feet per year. <br /> <br />11 <br />