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<br />xix <br /> <br /> <br />w <br />~ be completed by those dates. These estimates must be regarded as <br />00 <br />~ initial approximations. The feasibility and related studies, but- <br /> <br />tressed by additional research, will improve reliability of the <br /> <br />estimates. <br /> <br />It should be recognized that the values in the table are computed <br /> <br />average annual values at Imperial Dam under the stated assumptions. <br /> <br />The average annual modified value for 1970 of 865 mg/l based on the <br /> <br />1941 to 1968 period would probably have ranged from an annual mini- <br /> <br />mum of 750 mg/l to an annual maximum of 1,060 mg/l. However, with <br /> <br />Lakes Powell and Mead regulating the Colorado River, it would require <br /> <br />several consecutive low-flow years to produce an annual salinity con- <br /> <br />centration of 1,000 mg/l, or higher, at Imperial Dam. <br /> <br />Historically, records at Imperial Dam show that the average salinity <br /> <br />concentration for January 1957 was 1,000 mg/l and for December 1967 <br /> <br />it was 992 mg/l. Six other months in the period 1941-1968 have had <br /> <br />average concentrations above 960 mg/l. However, with present devel- <br /> <br />opment, it is probable that the average monthly concentrations for <br /> <br />these 8 months would have exceeded 1,000 mg/l. Furthermore, with <br />present developments, the 1,000 mg/l mean monthly concentration at <br /> <br />Imperial Dam would have been exceeded in 40 months during the period <br /> <br />1941-1968. <br />