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<br />,. <br /> <br />Outlook for Meeting Standards <br />in the Future <br /> <br />N <br />~ The flow-weighted average annual salinit~ values at <br />-J <br />~ Hoover and Parker Dams increased slightly in 1979, a <br /> <br />reversal from 1978. <br /> <br />However, at Imperial Dam, salinity <br /> <br />continued its downward trend. Based on the available data, <br /> <br />it appears that salinity values at Hoover and Parker Dams <br /> <br /> <br />will increase and Imperial will decline in 1980 from the <br /> <br />1979 levels. <br /> <br />Federal salinity control activities have been initiated <br /> <br />in the Grand Valley and Uinta Basin. <br /> <br />However, it will be <br /> <br />a number of years before any effects are felt at the three <br /> <br />lower mainstem stations. The system's reservoirs are nearly <br />full, the runoff for 1979-80 water year was above the long- <br /> <br />term average and releases in excess of water demands are <br /> <br />being made. <br /> <br />These factors tend to reduce salinity concen- <br /> <br />trations. <br /> <br />Salinity concentrations are about 30 mg/l below the <br /> <br /> <br />numeric criteria at Hoover Dam, 45 mg/l below the criteria <br /> <br /> <br />at Parker Dam, and at Imperial Dam, about 70 mg/l below the <br /> <br />numeric criteria. <br /> <br />Considering current levels of salinity <br /> <br />in the lower mainstem, the level of reservoir storage and <br /> <br />the present level of water demand in the Basin, it is highly <br />unlikely that the criteria will be exceeded during the next <br />twelve-month period. <br /> <br />-43- <br /> <br />,.J <br />