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<br />t-- <br />C,J! <br />,.j::>o <br />1~:~0:': en <br /> <br />CHAPTER I <br /> <br />INTRODUCTION <br /> <br />chapters are based on the methodology presented in the USGS report, with some <br /> <br />mndifications. <br /> <br />Conclusions <br /> <br />It is believed that a river budget can be used to accurately estimate <br /> <br />the salt pickup in Grand Valley. Specifically, the Colorado-Utah State Line <br /> <br />gage was determined to be the most accurate gage for estimating the Colorado <br /> <br />River outflow, and that adjusting the flows such that the consequent <br /> <br />unaccounted flow is zero provides a better estimate of salt pickup. Using <br /> <br />these assumptions the mean annual salt pickup from the entire Grand Valley, <br /> <br />including Stage One, was found to be 580,000 tons per year. The annual <br /> <br />values fluctuate widely leading to 95% confidence limits on the mean of plus <br /> <br />":.:<',, or minus about 90,000 tODS per year. No significant trend in salt pickup, <br />;..... '.. <br />.;;",,:;.:" <br /> <br />either incressing or decreasing, can be concluded. <br /> <br />It. should be noted that different methods of determining sslt pick up <br /> <br />yield different results as to the mean value and the confidence limits. It <br /> <br />is felt that the method utilized in this study is the best available and is <br /> <br />close to t~e average of other methods used in the past. Different methods <br /> <br />yield results that are about + 30 percent of the average. <br /> <br />1-4 <br />