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<br />, <br />. }. <br /> <br /> <br />-2- <br /> <br />, <br />.' <br /> <br />The relationships between 1976 present modified salt load <br /> <br />and flow at the four stations were analyzed to determine if sig- <br /> <br />o <br />W <br />-J nificant changes in the relationships have occurred during the <br />~ <br /> <br />through 1976 <br />/period. The results are discussed below. <br /> <br />Colorado River Near Cisco, Utah <br /> <br />The following procedures were used in <br /> <br /> <br />versus flow relationship for this station. Similar procedures <br /> <br />were also used in analyzing the other stations. <br /> <br />1. Using the least squares method, the regression equation <br /> <br />of salt-load versus flow was determined. This is shown on Figure <br /> <br />2. The regression residuals (residual=observed salt load <br /> <br />minus value determined from regression equation) were computed. A <br /> <br />residual mass diagram (accumulative residuals versus calendar <br /> <br />years) was then prepared, as shown on Figure 2. The residual mass <br /> <br />diagram indicates graphically as to whether the observed values of <br /> <br />the dependent variable (in this case, salt load) plot above <br /> <br />low the regression line (Figure 1). A major and persistent <br /> <br />in the slope of the residual ~ass diagram indicates a change, <br /> <br />in the salt-load versus flow relationship. <br /> <br /> <br />.. <br /> <br />-,... <br /> <br />C,il' <br />.c ,~ <br />."~cW <br />