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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />o <br />~ <br />l- <br />I- <br /> <br />ABSTRACT <br /> <br />OPTIMIZING SALINITY CONTROL STRATEGIES <br />FOR THE <br />UPPER COLORADO RIVER BASIN <br /> <br />Salinity is the most serious water quality problem in <br />the Colorado River Basin. The impact, felt largely in the <br />Lower Basin, is acute because the basin is approaching <br />conditions of full development and utilization of all avail- <br />able water resources. Current estimates indicate that each <br /> <br />mg/l increase in concentration at Imperial Dam results in <br /> <br /> <br />$450,000 annual damages. Therefore, in order to offset <br /> <br /> <br />salinity caused by the development of the vast energy <br /> <br /> <br />supplies and to allow the seven Colorado River Basin states <br /> <br /> <br />to fully utilize their allocation of Colorado River water, <br /> <br /> <br />it is necessary to implement cost-effective salinity control <br /> <br /> <br />programs in the basin. <br /> <br /> <br />A simple multi-level nonlinear optimization procedure <br /> <br /> <br />was utilized to formulate the most cost-effective array of <br /> <br />salinity control strategies for the Upper Colorado River <br />Basin. The incremental cost-effectiveness methodology <br />qualitatively indicates the location and general type of <br />alternatives to be implemented in a least cost basin-wide <br />salinity control program. The results also qualitatively <br />indicated the anticipated salt load reduction and expected <br /> <br />annual costs of each salinity reduction increase for any <br /> <br />preselected level of control. The analysis was limited to <br /> <br />ii <br />