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<br />Slight increases in salinity after 1962 are <br />N indicated for the San Juan River. However, statistical <br />~ <br />~ analyses indicate the periods before and after 1962 are <br />.1'\) <br />not significantly different. Therefore, as with the <br />Green River, it will be assumed that no change in the <br />salt load versus flow relationship has occurred. <br />The San Rafael River contributes only one percent <br />of the water and two percent of the total salt load to <br />the river system. Because the river's contribution to <br /> <br />the total inflow is relatively very small, only a brief <br />analysis of the relationship was made. This analysis <br />did not reveal an obvious change in relationship. <br />Analysis of the river reach from Lees Ferry to Grand <br />Canyon for the period 1941-76 was made to determine if a <br />change in the salt load entering this reach has occurred. The <br />studies indicate a change in the salt load versus flow relation- <br />ship beginning in 1955. For a virgin flow of 14 maf/yr, the <br />salt load based on the 1955 through 1976 period is 250,000 <br />tons less than when based on the 1941 through 1976 period. <br />Lake Powell Salt Pickup and Bank Storage - Two studies <br />were made of Lake Powell to determine if the assumptions <br />used in the mathematical model in 1975 and 1978 regarding <br />salt pickup, bank storage required modification. <br /> <br />-34- <br />