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<br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />rv <br />~ Arizona, for the period 1941-72 are presented in Tables 1 to 5 in <br />~ <br />~ Appendix F. Similar historical data are available for the Colorado <br /> <br />River below Hoover Dam, Arizona-Nevada; below Parker Dam,Arizona- <br /> <br />California; and at Imperial Dam, Arizona-California. The data obtained <br /> <br />at these stations are the means of estimating the salt contributions <br /> <br />to the Colorado River Basin. The salinity level and salt load at the <br />latter three stations are shown in Table 2 for selected periods. <br />The data are presented in greater detail in Tables 6 to 8 in Appendix F. <br />The annual streamflows, total dissolved solids (TDS) , and the salinity <br />level (mg/l) are also shown graphically for these three stations in <br />Figures 1 to 3 of Appendix F. <br /> <br />Salt Routing Studies <br />A series of salt routing studies were conducted to provide <br />estimates of the future flow-weighted average salinity levels for <br />each year at selected points in the Basin under differing assumptions <br />as to both the available water supply and future water uses. The <br /> <br />studies were designed to provide estimates of salinity under conditions <br /> <br />with and without salinity control measures during the period 1974 through <br />1990. They were carried out through the use of a salt routing computer <br />model developed by the Bureau of Reclamation.1I <br />All known natural and existing man-made water use and salt loadings <br />were identified for the river reach extending from Lake Powell to <br />Imperial Dam. No attempt was made to model the river system above <br />Lake Powell, since only the sum of the individual uses, including <br />exports from the Basin, and salt loading were required. <br /> <br />11 <br /> <br />and <br /> <br />Detailed information on the model is presented in: Ribbens, Richard <br />Wilson, Robert F., Bureau of Reclamation, U. S. Department of the <br />Interior, Denver, Colorado (1973), "Application of a River Network <br />Model to Water Quality Investigations for the Colorado River". <br /> <br />-23- <br />