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<br />w <br />~ Table 2. - Comparison of salt loads for 1979 conditions used for the <br />~ 1981 standards review with those used for the 1978 standards review <br />00 (in 1,000 tons per year) <br /> <br />. <br /> <br />Model input item <br /> <br />Us i ng 1981 Using 1978 <br />standards sta nda rds <br />revi ew re vi ew Difference <br />procedures procedures <br />8,174 8,537 -363 <br />-135 0 -135 <br />841 1,084 -243 <br />8,880 9,621 -741 <br /> <br />Salt inflow to Lake Powell <br />Salt loss in Lake Powell <br />Salt inflow, Lees <br />Ferry to Grand Canyon <br /> <br />Total <br /> <br />In addition to the studies discussed in this report, other studies are <br />underway to more accurately define the salt load versus flow relationship and <br />to ascertain the physical relationships for other changes which may be <br />occurri ng. <br /> <br />. <br /> <br />Projected Salinity Concentrations <br />Projected 1985, 1990, and 1995 flow-weighted average annual salinity <br />concentrations both with and without salinity control measures, for Hoover, <br />Parker, and Imperial Dams are presented in Tables 3, 4, and 5. Projected <br />salinity concentration for a 14 million acre-feet virgin flow at Lee Ferry and <br />the low depletion level are presented graphically on Figures 3, 4, and 5. <br />Future salinity concentrations will depend not only upon man's activities <br />but upon natural phenomena, including periods of high and low annual precipita- <br />tion, variations in distribution of precipitation over the Basin, variations <br />in the time of year precipitation falls, variations in natural evapotrans- <br />piration, and other variables. Also, within the major storage reservoirs, <br />salts precipitate, dissolve, and are mixed. Except for deviations caused by <br />factors beyond the control of man, average annual salinity levels can be <br /> <br />. <br /> <br />18 <br />