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<br />w <br />-.J <br />-<I <br />....1 <br /> <br />The salt routing studies were conducted to provide estimates of <br />future flow-weighted average annual salinity concentrations for <br />each year of the 1990 through 20~~0 study period at selected points <br />in the Lower Basin using the future water depletion projections <br />described earlier and an average annual long-term water supply of <br />15 maf. <br /> <br />Projected Salinity Concentrations <br /> <br />Projected 1990, 2000, and 2010 flow-weighted average annual <br />salinity concentrations for Hoover, Parker, and Imperial Dams with <br />existing completed salinity control measures only are presented in <br />Figures 3, 4, and 5. ' <br /> <br />Future salinity concentrations will depend not only upon human <br />activities but upon natural phenomena, such as runoff conditions, <br />natural evapotranspiration, and precipitation, dissolution, and <br />mixing within the major storage reservoirs. Except for deviations <br />caused by factors beyond human control, average annual salinity <br />levels will be maintained through 2010 at or below the 1972 levels <br />with the recommended plan of implementation. <br /> <br />Baseline Values <br /> <br />The 1975 Forum Report called for the development of baseline <br />values for monitoring points on the main stem and major tributaries <br />of the Colorado River as part of the process 0;: ':'d0ntifying and <br />evaluating changes in river salinity. The baseline values, which <br />are relationships between salt load and flow, were developed and <br />adopted by the Forum in 1980, and are used to assess the effects <br />of development, salinity control measures and/or other activities <br />in the area upstream of the baseline value stations. There is no <br />intent to make baseline values standards nor are they to be <br />considered or interpreted as st-.ndards for salinity. <br /> <br />Baseline values were developed for the following thirteen <br />stations in the Colorado River basin3: <br /> <br />Colorado River near Cameo, Colorado <br />Gunnison River near Grand Junction, Colorado <br />Colorado River near Cisco, Utah <br />San Juan River near Archuleta, New Mexico <br />San Juan River near Bluff, Utah <br />Colorado River at Lees Ferry, Arizona <br />Duchesne River near Randlett, Utah <br /> <br />3 <br /> <br />A description of the purpose and methodology for developing <br />these values and the values themselves can be found in the <br />Baseline Value Report which was adopted by the Forum on <br />September 11, 1980, and which is summarized in, the 1981 <br />Review. <br /> <br />13 <br />