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<br />J~ <br /> <br />(':) <br /> <br />~_ been an interest in id~ntitying and studying the natural point SbUrceS <br />-.J <br />(,;1 for some time as these are more susceptible of control than are the <br />~ <br />salts produced by diffused sourceE1. In the nhflonce of HI1Y use by man, <br />indiclItions arc that salinity at Lee Ferry averaged arotind 250 parts <br />of dissolved salts pet million parts of water (ppm). <br />Upon settlement of the Colorado River BaSin, the river's salinity <br />further :i.ncreased. Ninerals are added to the river in the irrigation <br />process by being dissol ved in the trllllrd t of wilter. front /I I1tr.eam and <br />II n n'lllrll tu tluJ tl\;I.'('WII. ThIll ptoU(,jHj J tl cd.!.leJ "tlLlle VldiUp" IiInd <br /> <br />, <br />jF: <br /> <br />'" <br /> <br />irrigation developments in the Upper Colorado River add about 3.5 mil~ <br />lion tons of salts per year to the river through this process. these <br />irrigation developments also consumptively USe about two million acre- <br />feet per year from the river. Salinity is adversely affected by both <br />salt pickup and consumptiv(~ use, oJnce it is tllt' ratio of dis30lved <br />salts to total volume of water. <br /> <br />Municipal and industrial uses in the Upper Basin add approximately <br />130,000 tons of dissolved salts to the riVer, a minor amount compared <br />with contributions from irrigated agricu1ture. Other sources of in~ <br />creased salinity in the Upper ~asin are: (1) export of low salinity <br /> <br />.j <br />>-\<: <br /> <br />HHtl'l: t'rOlu chI' hCtJlh~nl.'r:1 of the Cn !"):lldo IUver flyotl~m tn IHI.1 oin:lnH <br />bntliun in tlto Iltutl'tl ot Utllh, Colorllcto, and New Meltito, uhd (~) eVlilpo- <br />ratiolt"'ft"m!I'tlt'@"'~ storage reservoirs. In t'eeent years salinity <br />, ''>t.~ <br /> <br />at Lee Ferry has averaged about 610 ppm. <br /> <br />....__., t . <br />The effect of man in c~uslng increas~d salinity iso-ot limited <br />to the Upper Basin, as a similar process occurs in the Lot~er Basin. <br />Over 900,000 acre~f('et per year Is C'V<11iorated from Lal<es Mead, Mohave, <br /> <br />~2~ <br />