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<br />,
<br />.
<br />
<br />.
<br />
<br />.
<br />
<br />.
<br />
<br />....
<br />a>
<br />00
<br />-.<,
<br />
<br />Colorado Rivet
<br />locations
<br />
<br />Annual flow-weighled
<br />average dissolved-solids
<br />conCenlralion Img/ll
<br />
<br />Bdo.... llooH'r Dam
<br />Helo"'Parlcr Dam.
<br />AllmJ'ltriall>am_
<br />
<br />723
<br />7~7
<br />In\!
<br />
<br />The o\'erall approach to mt.'eting the ,riterta i~
<br />to prevent dis\ol\'cd \olids from emering and
<br />mixing with the river's 110...... A number of
<br />agricultural. poinl. and diffme sources of dis-
<br />solved ~olid\ hase been identified throughout
<br />the basin for possible interception.
<br />Another sour,'c of great interest in th,'
<br />dis\olwd-solids concentration of the Colorado
<br />Ri\'cr is the international treaty with \lexico
<br />concerning the riscr', \~a[er quality as it crO'iSCS
<br />the imcrnationaJ border.
<br />In June 1974, Congress enacted Ihe Colora-
<br />do River Basin Salinity Control Act (Public
<br />Law 93-3:!O) whkh directed the St'aetary of the
<br />Interior to e\pl.-dite planning studies on I:!
<br />salinity-concrol projttts of a hasinwide pro-
<br />gram to control the dissol\ed solids of Colora-
<br />do RiH'r waler and to comtruct four select
<br />salinity-control projects. Titk I of the Act
<br />authoril{'d the construt'tion of fat'ilities and
<br />on farm measures to enabk the United States to
<br />compl)' with it, obligations under .\Iinule No.
<br />:!4:! of the International Boundary and Water
<br />Commission, United States. and \1exico. In
<br />brief. .\1inute :!4:! requires that \\ater delhert'd
<br />to \lcxico ha\e an a\erage annual dissolvcd-
<br />solids l.:onl.:cn1ration Ihat is no more than 115
<br />mglL (.:t _~O mg/l) greater than the concentra-
<br />tion in Colorado Ri\er \\-ater arrh-ing at Imperi-
<br />al Dam upstream of the- United States-~lexican
<br />border.
<br />At the Slatt" ]evel, all st"\"en Colorado River
<br />basin Stalt"s h;1\e appointed representathes to
<br />Ihe Colorado Ri\er Basin Salinity Control
<br />Forum and 10 Ihe Colorado Ri\er Basin Salini-
<br />ty Control Advisory Council to coordinate
<br />State actions and to advise the Federal Go\'Crn-
<br />ment on the State "ie\\-" on issues affecting
<br />\\-ater-quality standards and ways to meet those
<br />standards. At tht' Federal !c\'e1, dissol\ed-
<br />solids-control efforts l)f the U.S. Department
<br />of the Interior, the U.S. Environmental Protec-
<br />tion Agency, and the U.S. Department of
<br />Agriculture arc coordinated through an Intera-
<br />gem'y Salinity Control Committee to improve
<br />management of irrigated agrit'ulture through
<br />research and tmfarm impro\emems and to
<br />implement sek'(led stru..:tural and non....truclural
<br />control measure' (U.S. Bureau of Reclamation,
<br />19!\Jc).
<br />Specifi..., solution\ to the dis..ohed-..olids
<br />problem depend, in part, on the mt'Chani.-;.ms by
<br />
<br />.
<br />
<br />National Waler Summary 1984-Waler-Quatity Issues
<br />
<br />77
<br />
<br />EXPLANATION
<br />
<br />,
<br />\l SII..nurnbe,
<br />
<br />
<br />.
<br />
<br />Donolv&(J-sohds,on,enl,al,on
<br />
<br />'..
<br />.
<br />
<br />....."'9..""'1><"".,..
<br />'"" ......,"'..'"
<br />1>;0 ....U"
<br />110 ....,","'..'"
<br />
<br />~
<br />8''''
<br />.'~
<br />rJ~'\~lm
<br />- "1---100-
<br />~ - 13'2]8()
<br />no ~.,.~ ~
<br />,,1:Jal V
<br />2"'11'4(~ 190
<br />1010? 151'~ r
<br />19O}; V.9O . 1
<br />l>lOO 16 1/ : XlO ],,ef.Y~
<br />2~".: 3'60,,1'~.\l;: 1111
<br />'175SO 210"
<br />6530 18\7 190 5 'V COLORADO
<br />~". IUO~'I3O
<br />530 no ~100 ...........
<br />200 \'50
<br />
<br />,
<br />,
<br />20 I .
<br />____'V,~-.___19r_
<br />'80 ?520
<br />UPPl:R COl.ORAOO 170
<br />RIV(III BASI" 1SO
<br />1
<br />
<br />R."II~(}t......n4n"".'~nc<'n".I>on
<br />
<br />.. ~~
<br />"V 501_1000
<br />T lOOl_2!;OO
<br />'" G...'~, '....n 2!>00
<br />
<br />
<br />r
<br />
<br />,
<br />,
<br />
<br />~
<br />,
<br />
<br />lQOI,IlLES
<br />,
<br />
<br />UTAH
<br />
<br />
<br />
<br />12(
<br />\7'1080
<br />~
<br />..
<br />
<br />
<br />NEW
<br />MEXICO
<br />
<br />ARIZONA
<br />
<br />~
<br />
<br />,
<br />
<br />~
<br />
<br />I
<br />r-- --
<br />~--~
<br />
<br />------
<br />
<br />,------
<br />,
<br />"
<br />
<br />which the dis..ohed ~olids enter the river. Sev-
<br />eral di"sllhed-solid..-control mea..ures for the
<br />Colorado River basin currently are under
<br />evaluation:
<br />
<br />Figure 45. Ma_lmum, mean.
<br />and minimum dissolved.
<br />sohds concentrations 'or
<br />26 stalions in the Colorado
<br />River bas,n. 1965 10 1983
<br />(Source: Compiled by J. E.
<br />KIrcher 110m U.S, Geologi-
<br />cal Survey and US. Bureau
<br />of Reclamation dala,l
<br />
<br />I. POint-source controls arc pwpo\ed to
<br />rt"mon' salt from such ]ocal area.. as mint'r-
<br />al spring.., abandoned oil "ells, and gey-
<br />~ers. To date tI9S4), se\eral abandoned oil
<br />wells ha\e heen plug!!~'d in the .\lcder
<br />area, denea..ing. dissoh cd-solid.. load.. lo-
<br />cally by as much a.. 57,(XlO IOn/yr _ Propos-
<br />als arc being formulated for the control of
<br />
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