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<br />003125 <br /> <br />Page 24 <br /> <br />Each link may have a cost associated with moving a unit of flow along <br /> <br />it. It will also have an associated minimum and maximum capacity. The Out- <br /> <br />Of-Kilter Algorithm attempts to find a set of flows in all links which <br /> <br />minimizes the total cost of the system within the capacity constraints. <br /> <br />Thus, by inverting costs into priorities, it is possible to rank demands, <br /> <br />storages and outflows and use the Out-Of-Kilter Algorithm to solve for the <br /> <br />optimum set of flows. MODSIM solves the network for one period at a time. <br /> <br />For this study, a network was created which represents the Colorado <br /> <br />River Basin. Figure 111-1 shows this network. Table 111-3 names and <br /> <br />describes each node. There are 35 nodes and 36 links which are used to <br /> <br />represent the system of rivers, reservoirs and demands which make up the <br /> <br />Colorado River System. <br /> <br />The model is configured to run on the basis of four seasons, as <br /> <br />summarized in Table 111-4. The operating rules for Lake Mead specify a <br /> <br />target flood control capacity on January 1. Thus, it was necessary to have a <br /> <br />seasonal break at that point to allow the flood control pool to be evacuated. <br /> <br />Flood control operations and simulation are discussed in more detail below. <br /> <br />Enhanced flows from treated lands will contribute principally during the <br /> <br />period from May through July. The period August through December is <br /> <br />characterized by low flows and irrigation demands. Irrigation in the Upper <br /> <br />Basin ends in September or October while, in the Lower Basin, it continues <br /> <br />throughout the year. For this reason, and because much of the available data <br /> <br />were already compiled on the basis of a water year, a seasonal break was made <br /> <br />between September and October. <br />