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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 />II <br /> <br />o <br />~ <br />w <br />CJ1 <br /> <br />-11- <br /> <br />There are basically three sets of optimization studies <br />in the Upper Colorado River Basin which specifically identify <br />salinity as a goal. These are discussed in the following <br />paragraphs. Other indirect economic input-output studies <br />such as Howe et al. (1972) and Morris (1977) also evaluated <br />salinity effects but did no optimization. Bishop et al. <br />(1975) performed a linear programming analysis of the <br />effects of energy development in the Upper Basin on water <br />resources in Utah. <br />Erlenkotter and Scherer (1977) developed a fairly <br />comprehensive deterministic investment planning mixed- <br />integer optimization model for salinity control on the <br />Colorado River. They assumed given values of future diver- <br />sions and associated salt loads and examined the benefit- <br />cost balance between expenditures for salinity reduction, <br />associated with given projects, and the economic damages <br />which would be incurred if the expenditures were not made. <br />The deterministic simulation portion of the model also <br />permitted the projection of when and which projects should <br />be undertaken in a general sense. Scherer (1977) also <br />developed a static net benefit-maximizing model of irri- <br />gation related salinity control measures. However, these <br />models only indicated when total aggregate projects should <br />come on-line and did not provide for optimal combinations of <br />individual components from within the various projects for <br />the most cost-effective program. Erlenkotter and Scherer <br />(1977) and Scherer (1975) considered 15 basin-wide Water <br />