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<br />~ <br />en <br />to <br />tv <br /> <br />. <br /> <br />. <br /> <br />A standard linear regression analysis was run on data from <br /> <br />each station. <br /> <br />This produced a best-fit straight line relating <br /> <br />salt load to flow, and a value for the standard deviation of the <br /> <br />data. A residual mass curve was plotted and examined visually, <br />for consistency, of the input data. <br />A double mass curve was plotted, and successive ten-year data <br />periods were compared for statistically significant changes in slope. <br />At the 95 percent confidence level, there were no significant changes <br />in slope. <br />Figures 1-13 show the salt load/flow relationships developed <br />for the thirteen stations. The (a) figure includes the data points <br />used to develop the relationship, while the (b) figure shows the <br />two-standard deviation band1l, and additional annual data points <br />collected since 1972. <br /> <br />The two-standard deviation band is obviously very wide. This <br /> <br />is because a large part of the variation in salt load cannot be <br /> <br />explained by variations in streamflow alone. <br /> <br />As yet, there is no <br /> <br />practical method of accounting for all factors affecting salinity. <br /> <br />11 <br /> <br />When the aggregated salt load/flow data for a given year <br />results in a data point which falls outside the two- <br />standard deviation band, there is a 95 percent probability <br />that the change did not result by chance. <br /> <br />-3- <br />