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<br />N <br />~ <br />en <br />I-' <br /> <br />Investigation was centered on four areas: inflow <br />to Lake Powell, salt pickup in Lake Powell, bank storage <br /> <br />in Lake Powell and ungaged inflow between Lees Ferry and <br />Grand Canyon. <br /> <br />With regard to inflow to Lake Powell, the relation- <br /> <br /> <br />ships between the 1976 present modified salt load and <br /> <br />flow at the four gaging stations measuring inflow into <br />Lake Powell were analyzed to determine if significant <br />changes in the relationships have occurred during the <br /> <br />1941 through 1976 period. <br />Results of the study show that for the Colorado <br />River, there is a 90 percent or greater probability that <br />the salt load versus flow relationship for the 1968through <br />1976 period is different than the relationship for the 1941 <br />through 1967 period. This indicates a change in relationship <br />beginning in 1968. For a virgin flow of 14 mar/yr, salt <br />load to Lake Powell is 360,000 tons less when based on <br /> <br />the 1968 through 1976 period than when based on the 1941 <br />through 1976 period. <br /> <br />In the Green River, a cyclical relationship resulted <br /> <br />with a lower level salinity for the 1970-76 period. The <br /> <br />period of record is too short, however, to determine <br /> <br />whether a significant change in relationship has actually <br /> <br /> <br />occurred. Until additional data becomes available, it will <br /> <br />be assumed that the relationship has not changed. <br /> <br />-33- <br />