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<br />~ <br />o <br /><0 <br /><.0 <br /> <br />by 2015, the mean annual salinity concentrations at the three lower main stem stations would be <br />at or below the numeric criteria, with Hoover Dam being the controlling station. This statistical <br />analysis is included as Appendix C. <br /> <br />I:rQpact~ of HydrolQIO' <br /> <br />Beyond the exceedance percentages shown in Appendix C, which show how often various <br />salinity levels should be attained, it is important to understand that annual salinity levels may <br />remain depressed or elevated for a period of time. The historical plot of salinity at Imperial Dam <br />shown in Figure 2-2 earlier in this Review effectively demonstrates this. <br /> <br />Also, Reclamation's CRSS model was used to define how quickly salinity may increase <br />or decrease from the present levels recently observed in the Colorado River system. The model <br />runs were made by setting the starting conditions to the observed level of salinity and storage in <br />the reservoir system. The highest and lowest periods of record were selected out of the CRSS <br />database to define these bounds. The model runs were started with these critical periods and <br />allowed to continue through the database for 20 years as an example of how salinity may vary (see <br />Appendix C). <br /> <br />2-12 <br />