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<br />'" <br />~ number of factors, both natural and man-made, including: <br />c.o <br />~ natural sources of salinity, the volume and pattern of flow <br />of the river, the volume of storage in each of the system <br />reservoirs, the amount of water used and the quantity and <br />quality of water returned to the river and its tributaries <br />after such use. <br /> <br />The salinity of the Colorado River is influenced by a <br /> <br />In revising the salinity standards, a series of salt <br />routing studies was conducted by the Forum to provide esti- <br />mates of future salinity levels at selected points in the <br />basin under different assumptions as to both the available <br />water supply and future water use. These studies were <br />similar to those done for the 1975 Forum report and pro- <br />vided estimates of salinity conditions with and without <br />salinity control measures during the period 1977 through <br />1990. The revised studies reflect changes which have <br />occurred since 1974. Initial conditions of reservoir stor- <br />age and salinity for the studies were those of December 1977. <br />These initial conditions represent the integrated effects of <br />historical basin development, depletions and water supply <br /> <br />through 1977. <br /> <br />To evaluate possible future salinity levels, a number <br />of water supply conditions and future depletion rates, <br />developed by the Work Group, were considered. Four water <br />supply levels -- virgin flows of 12, 13, 14, and 15 million <br /> <br />acre-feet per year at Lee Ferry <br /> <br />and three future depletion <br /> <br />rates -- low, moderate, and high -- were employed. <br />2 <br />