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<br />-, ..."- <br />'., " . <br />. '''>r:_;:'''~C~', :~,c.:~_.:_.. <br /> <br /> <br />10 <br /> <br />sooner than previously estimated. It will have little impact <br /> <br />on salinity if this relationship is not used in combination with <br /> <br />o <br />(.~) <br />00 <br />t\:) <br /> <br />the relationship derived for salt pick-up. However, if both <br /> <br />relationships are included in the salt routing studies, the result <br /> <br />would be a reduction in salinity because positive changes in <br /> <br />storage in Lake Powell would be smaller (less salt gain) <br /> <br />and negative changes in storage would be greater (more salt loss). <br /> <br />Colorado River From Lees Ferry <br />to Grand Canyon <br /> <br />Tributary inflow of salt to the river reach between Lees <br /> <br />Perry to Grand Canyon were analyzed for the Calendar years 1941 <br /> <br />through 1976 to determine if a change in salt load has occurred <br /> <br />during that period. Tributary inflows of water and salt to the <br /> <br />reach were computed by subtracting values measured at Lees Ferry <br /> <br />from those near Grand Canyon. <br /> <br />The double mass-diagram of accumulative inflow of salt versus <br /> <br />accumulative inflow of water is shown on Figure 11. This diagram <br /> <br />5 <br />shows a major decrease in salt load beginning about 1914. Because <br /> <br />5' <br />some.of the computed salinities for the period before 195fi are <br /> <br />,., "J. ,'-' <br /> <br />! <br />i <br />.~~:.d' <br />