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Using the 78 years of historic hydrology in the CRSS data-base, Reclamation determined the mean salinity levels through the year 2015, The actual annual values will vary significantly from these averages. The results may be thought of as a trend analysis with the random, hydrologic variation removed. The results of this analysis are presented in Figures 2-6 through 2-8. For each of the three stations, the figures show, relative to the numeric criteria: (1) where mean salinity levels would have been without any controls (past, existing, or future); (2) where they would be with existing and no additional controls; and, (3) where they would be with both existing and future salinity controls. ~ o (0 0:> Future salinity concentrations will depend not only upon human activities but upon natural Predicted Flow-Adjusted Salinity Below Parker Dam .~ Without ContMls :J' ...",...' - OJ t;C Without Additional ..s Controls f 7 - /'--.... ~ I>> With Additional Cf) Nur:nericCriteria Control. 1960 2000 2020 Years 2040 1980 FIGURE 2-8 Predicted Flow-Adjusted Salinity Below Hoover Dam :J' 0. E ~ ! 7 1ii (f) NumericCrita;ia 1960 1980 2000 Years 2020 2040 FIGURE 2-7 Predicted Flow-Adjusted Salinity At Imperial Dam :J' - OJ E. 9 ,~ ,S 1ii (f) /' Withou' eon.... Without Additional eon.... With Additional eon.... 1960 1980 2000 2020 Years 2040 FIGURE 2-9 phenomena, such as runoff conditions, natural evapotranspiration, and precipitation, dissolution and mixing within the major storage reservoirs. Even with full implementation of the Program's current Plan of Implementation that would offset the human impacts since 1972, the actual salinities at the criteria stations (and elsewhere in the Basin) will continue to fluctuate with hydrologic conditions in the future. Exceedance Evaluation A statistical analysis was performed for this Review in order to determine the effectiveness of the program in maintaining the numeric criteria. The analysis evaluated four conditions of various levels of salinity control ranging from no controls to implementing the Plan. Data were developed which indicate the frequency of occurrence of various mean annual salinity concentrations, Provided the salinity control measures in the Plan of Implementation are in place 2-11