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<br />The 1975 and 1978 salinity projections assumed there <br /> <br />!'oj <br />~ <br />0') <br />w <br /> <br />were no gains or losses of salt in Lake Powell. The current <br /> <br />analyses showed an average annual loss of salt in the <br />reservoir of 135,000 tons. The analysis also showed a <br />relationship between salt gain or loss and change in reser- <br />voir level. This relationship indicated a net loss of salt <br />for positive storage changes in storage of less than 1.5 <br />maf/yr and for all negative storage changes, a net gain of <br />salt for positive storage changes greater than 1.5 maf/yr. <br /> <br />The amount of water going into or coming out of bank <br /> <br /> <br />storage in Lake Powell was, in the previous (1975 and 1978) <br /> <br /> <br />salt routing studies, assumed to be 10 percent of the reser- <br /> <br />voir storage change. A mass-balance analysis covering the <br /> <br /> <br />period 1963 through 1976 indicated the percentage of water <br /> <br />going into bank storage was considerably greater. <br /> <br />This <br /> <br />period, however, includes the initial filling cycle of <br /> <br />Lake Powell which may not be representative of future <br /> <br />conditions. <br /> <br />These two items will be analyzed further and, if <br /> <br />the original assumptions are shown to be invalid, revised <br /> <br /> <br />assumptions will be included in the salt routing model and <br /> <br /> <br />used for making future salinity projections for the 1981 <br /> <br />standards revision. <br /> <br />-35- <br /> <br />,t..J. <br />