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<br />" . <br />Evan D. Dildine, P.E., Technical Secretary <br />Water Quality Control COllllllission <br />May 22, 1979 <br /> <br />. <br /> <br />-6- <br /> <br />w <br />....... <br />00 <br />W <br /> <br />The aspect of the salinity control efforts that have the most, <br /> <br />interest to this group is probably in the area of the industrial <br /> <br />discharges. However, to put this contribution in perspective, we <br /> <br /> <br />should look at the Forum's report of October, 1975 ?j which lists <br /> <br />the factors causing the salt loading at Hoover Dam and are shown <br /> <br />in Table III. <br /> <br />TABLE I II <br /> <br />Natural Diffuse Sources <br />Na tUl"a 1 Poi nt Sources <br />Irrigated'Agriculture <br />Municipal and Industrial <br />Exports Out of Basin <br />Evaporation and Phreatophytes <br /> <br />39% <br />a~s <br />37~~ <br />l~; . <br />3'Y <br />" <br />12% <br /> <br />Total <br /> <br />1 f)0~~ <br /> <br />(1942-1961 period of record adjusted to 1960 conditions) <br /> <br />The future industrial contribution prillJarily from energy clevelop- <br /> <br />lIIent coulcl be the largest use that could increase sa'linityin the <br /> <br />Colorado River, The current cost of d('sal ting methods vlDu'lcl probably <br /> <br />preclude municipal use in the forseeable future, That would be for <br /> <br />wastewater treatlllent not for domestic water supply, as the latter could <br /> <br />become economically feasible under certain circumstances. The' annual <br /> <br />cost of salinHy on downstream or lower basin users is e'stimated at <br />