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<br />. <br /> <br />. <br /> <br />.N <br />en . <br />H::>- <br />ill <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />of three authorized Upper Basin water development projects (Animas- <br /> <br /> <br />La Plata, Dolores and Dallas Creek); and the sixteen salinity control <br /> <br />projects specified in Title II of PL 93-320. The initial year of <br />operation of the salinity control projects was determined after con- <br />sidering the time required for planning, authorization and construction. <br />The individual projects and year of initial operation are described <br />in Chapters V and VI. <br />Figures 2-19 show the projected salinities from selected analyses <br /> <br />at three stations <br /> <br />Hoover, Parker and Imperial Dams. Future <br /> <br />flow-weighted annual salinity concentrations at these locations <br />depend not only upon man's activities, but upon natural phenomena, <br />including periods of high and low annual precipitation, variations in <br />distribution of precipitation over the Basin, variations in the time <br />of year precipitation falls, vairations in natural evapotranspiration, <br /> <br />. etc. Also, within the major storage reservoirs, salts precipitate, <br />dissolve, and are mixed with results largely beyond the control of man. <br />Consequently, future adherence to the 1972 numeric criteria will be <br />. affected by factors beyond the control of man as subsequently explained <br />in Chapters ,IV, V and VIII. Except for deviations caused by factors <br />beyond the control of man, annual average salinity levels can be main- <br />tained at or below the 1972 levels at the following lower main stem <br /> <br />. <br /> <br />Ie <br /> <br />. <br /> <br />. <br /> <br />stations through 1990 with full implementation of salinity control <br />measures for the following water supply and depletion rates: <br />Hoover Dam -- Virgin flow at Lee Ferry of 14 million acre- <br />feet/year or more with low and moderate depletion rates. <br />Parker Dam -- Virgin flow at Lee Ferry of 14 million acre- <br />feet/year or more with a low depletion rate and 15 million acre- <br />feet/year or more with low and moderate depletion rates. <br /> <br />-30- <br /> <br />,1,." <br />