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<br />Studies were conducted to provide estimates of future flow-weighted average annual salinity <br />concentrations for each year of the study period at Hoover, Parker and Imperial Dams in the <br />Lower Basin. <br /> <br /> <br />~ CRSS was first used to determine what the existing salinity levels would have been if <br />q:) hydrolog~c conditions had been "normal" (had approximated the average annual long-term water <br />~ supply). Based on this analysis, the program has a computed shortfall of 418,200 tons of salinity <br />control. This amount of additional salinity control is needed to offset the existing (1995) level of <br />water development beyond the 621,400 tons of existing salinity control. <br /> <br />CRSS was then used to predict salinity levels under normal hydrologic conditions at 3 <br />levels of salinity control: (1) without any control, (2) without any additional future control, and <br />(3) with enough future control to return to the numeric criteria by the year 2015. In order to meet <br />the numeric criteria in 2015 at the Hoover station, the salinity program will need a total of <br />1,476,600 tons of salinity control as is shown in Table 2-4. This represents 855,200 tons beyond <br />the existing 621,400 tons of salinity control. In other words, llwroximately 45,000 tons of new <br />AAlinity control mf'.asures must he added "."h year if the program is to meet the numeric criteria <br />at the Yf'.ar 2015. <br /> <br />Table 2.4 <br />Salinity Control Requirements and Needs <br /> <br />Backlog (shortfall) in Existing Controls <br />2015 Salinity Control Needs (total) <br />1996-2015 Additional Salinity Control Needs <br />1996-2015 Implementation Plan <br /> <br />1,039,600 tons <br />621,400 tons <br />418,200 tons <br />1,476,600 tons <br />437,000 tons <br />855,200 tons <br /> <br />Existing Salinity Control Needs (1/95) <br />Measures in Place <br /> <br />2-10 <br />