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<br />.\ <br /> <br />. <br /> <br />~. .,.. C'- -. <br />Lj~~' <br /> <br />river's salinity et Lee Ferry will increase by over 30 percent by <br />year 2000. Because of changing water--salt relationships caused by <br />Lower Basin uses and water losses, the numerical impact of salinity <br />increases at Lee Ferry is approximately doubled at Imperial Dam. <br />The Colorarlo River Board has concluded that, without salinity <br />control measures, the average salinity at Parker Dam, the point on <br />the river where The Metropolitan Water District of Southern Californi~ <br />now diverts and where the Central frizona Project will divert, will <br />increase from the present ~verage of 740 ppm to over 1,100 ppm by <br />year 2000. At Imperial Barn, ~lhere the bull: of diversions are made <br />for agricultural use in California and Arizona, the compa~able values <br />are 850 ppm at present and 1,3l,O ppm by the turn of the cenlm:y. Ap- <br />proximately 7S percent of the increases will be due 1:0 Upper Basin <br /> <br />developments and 25 percent will be due to Lower Basin developments. <br />It should be noted that the above values are annual averages, and <br />that higher seasonal values have been experienced in the past and <br />can be expected to occur in the future. Figure 3 shows gr8phic,,11y <br />these projections of future salinity at Parker and Imperial Dams. <br />Deleterious Impact of Salinity <br />The deleterious impact of high salinity water on municipal and <br />industrial water users is felt in high soap consumption, formation <br />of objectionable scale in heating vessels, damage through corrosive <br />attack on distribution pipelines and user plumbing systems and appli- <br />ances, and added water treatment and conditioning costs. There is <br />insufficient information available to precisely define the dollar <br />values attributable to the above detriments. However, preliminary <br /> <br />-6- <br />