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<br />Water Supply Assumptions <br />To evaluate future possible salinity conditions, five water supply <br />~ conditions were employed -- a virgin flow of 12, 13, 14, 15, and 16 <br />. ~ million acre-feet per year at Lee Ferry, Arizona.V It was considered <br />that within the time frame of the study, this range of flows would <br />most likely encompass the actual future flow. It should be noted that <br />each water supply condition (e.g., 12, 13, 14, 15, and 16 million <br />acre-feet) was considered to be a constant flow each year of the <br />17-year study period. The 1896-1974 average annual virgin flow at <br />Lee Ferry is 14.9 million acre-feet. <br />It should also be noted that to regulate the erratic flows of <br />the Colorado River, a large volume reservoir storage system has been <br />constructed. It is currently at about 75 percent capacity. This <br />reservoir system will dampen the variation.in both the annual flow <br />and salinity in the lower main stem. <br /> <br />.__~ected Salt Load and Salinity Concentration <br />Projections of future Salinity levels in the lower main stem <br />were made for the full range of assumed water supply conditions <br />and the three projected water use rates assuming that no salinity <br />. <br />control measures would be undertaken. Future salinity levels for <br />1980, 1985, and 1990, shown by Tables 4, 5, and 6, resp~ctively, are <br /> <br />V The Colorado River Compact defines the Upper Basin - as the parts - o-r- <br />the Basin "within and from which waters naturally drain into the <br />Colorado River System above Lee Ferry", and the Lower Basin as that <br />part of the Basin "wi thin and from which waters naturally drain into <br />the Colorado River System. below Lee Ferry". Lee Ferry is defined <br />as a point on the mainstream of the' Colorado River one mile below <br />the mouth of the Paria River. <br /> <br />-28- <br /> <br />. <br />