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<br />Sediment Loadings <br /> <br />"'-4 The <br />U'l <br />l-" stations <br />H~ <br /> comp i led <br /> updated <br /> (1965) . <br /> <br />average-annual sediment load was computed for each of 73 gaging <br /> <br />in the Upper Colorado River Basin by Andrews (1979). This report <br /> <br />all available gaging-station information collected since 1957, and <br /> <br />a comprehensive basin-wide study by lorns, Hembree, and Oakland <br /> <br />The sediment loads were computed by either of two methods depending <br /> <br />upon the number of days that the sediment concentration had been measured and <br /> <br />the daily sediment loads calculated. At those gaging stations where daily <br /> <br />sediment loads had been determined for a period of 5 or more years, the aver- <br /> <br />age of the sum of annual sediment loads was computed, and was taken to be an <br /> <br />estimate of the longer term average annual sediment load. In most instances, <br /> <br />however, the number of measured daily sediment loads was much fewer than re- <br /> <br />qui red for this approach. Therefore, the relation between daily sediment load <br /> <br />and daily discharge was calculated by a linear regression of the 10g-trans- <br /> <br />formed data. Such relations were only used when at least 25 measured sediment <br /> <br />concentrations covering 80 percent of the range of daily mean discharges were <br /> <br />avai lable. Annual sediment loads were computed for the period of measured <br /> <br />daily discharges using a program described by Glover (1978). This procedure <br /> <br />calculates the daily sediment loads by combining the regression relation <br /> <br />between daily sediment load and daily discharge with the observed daily <br /> <br />. :~ <br /> <br />discharges. <br /> <br />~ <br />