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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 />existing reservoirs or by building new storage capacity. With regard to adding <br />storage capacity, the consultant determined that additional capacity would be <br />helpful and thus a wide range of possibilities are available. One of the possibilities <br />would, in theory, store enough water to meet the needs of all farmers and ranchers <br />in all years, including very low rainfall periods during the crop growing season. <br />Providing the maximum amount of storage capacity that might possibly be needed <br />in any year, but which would not be needed in all years, would also be a maximum <br />cost plan. The process of plan formulation involves obtaining a plan which would <br />meet the need for additional water at a cost within the financial capabilities of the <br />sponsoring organizations. <br /> <br />According to the consultant, it is not necessary for the plan to focus exclusively on <br />either a more effective use of existing supplies of water or a provision of <br />additional storage. In fact, good plans could include elements of both ditch and <br />control structure improvements in the interest of more effective use of existing <br />supplies, plus additional storage capacity. <br /> <br />Planning considerations which limit or restrict the range of alternative ways to <br />deal with identified problems and needs are usually referred to as planning <br />constraints. In the present study, respect for (not infringing on) existing water <br />rights is a planning constraint. Occasionally, planning constraints are absolute in <br />the sense that they are imposed by physical conditions which cannot be changed, <br />such as topographic conditions which constrain the amount of storage that could be <br />provided. Planning constraints also have a degree of flexibility, such as in the <br />existing situation where a constraint imposed by water rights could possibly be <br />modified by developing a system of exchanges of water. <br /> <br />Section 2: Operation Studies <br /> <br />Two computer models were formulated for simulation of project operations. The <br />first model was used to evaluate the availability of water to the project and the <br />impact of modifications to the existing basin operations. The second model was <br />used to determine the sizes of the structural elements of the project, and the <br />effects of different reservoir sizes. <br /> <br />IV-2 <br />