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<br />xvii <br /> <br /> <br />W <br />tv <br />00 <br />N <br /> <br />Levels of salinity concentrations presently found in the lower <br /> <br />Colorado River vary depending on the type period used to describe <br /> <br />the level. As indicated above, the average for a year is greater <br /> <br />than the level during the period 1941 to 1968 and the peak monthly <br /> <br />, <br /> <br />concentration is even greater than the level for a year. <br /> <br />To depict effects of the Water Quality Improvement and Allied Pro- <br /> <br />~rams, Table 1 was developed showing the projected reductions in <br /> <br />salinity concentrations for each program and the estimated effects <br /> <br />on the synthesized salinity levels at Imperial Dam. <br /> <br />The values in the table are initial estimates based on the average <br /> <br />hydrologic conditions for the period of record 1941-1968. <br /> <br />The 1970 average annual value of 865 mg/l has been derived on the <br />assumption that present developments in the basin were completed and <br /> <br />operating during the period of record. In other words, the effects <br /> <br />on water quality of all present developments have been extended back <br /> <br />to 1941 from the time they became operational. <br /> <br />Similarly, the average annual values for the years 1980, 1990, and <br /> <br />2000 were synthesized to reflect the influence on water quality dur- <br /> <br />. <br /> <br />ing the period of record of water resource developments expected to <br />