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<br />Functional Specification for the Planning Model <br /> <br />Administration and Accounting for Aggregated Systems <br /> <br />Most of the small water supply systems in the basin will be represented in the model in <br />aggregated form. This simplification is necessary due to the sheer number of water rights and <br />diversions in the basin, By and large these systems are small irrigation diversions, although <br />so~e domestic uses may be included, As a result" it may not be possible to assess directly the <br />effe~ts of changes in basin administration and operation on a specific :ditch. <br /> <br />The aggregation of smaller systems will be based primarily on physical proximity. The <br />physical diversion capacity of each aggregated system will reflect estimates of the combined <br />physical capacities of the component diversions, The physical water demand of each <br />aggregated system will be based on the combined acreage irrigated by the component <br />diversions, Modeled return flows will be assumed to accrue at various locations according to <br />user-supplied return flow factors, <br /> <br />The water rights associated with each aggregated system will be comprised of all the <br />water rights of component diversions and lumped into priority classes, These aggregated <br />rights will be represented as network arcs in a manner similar to the representation of <br />individual direct-flow rights shown earlier in Figure l(a); the capacity of each arc will reflect <br />the summed decree amounts in that class and the rank on each arc will map the relative priority <br />of that class. <br /> <br />The priority classes will be defined by the "controlling" water rights of the basin which <br />are the rights of the systems represented individually in the model as well as certain other <br />ri~ts which could potentially exert significant influence on basin administration and <br />accQunting. Final definition of controlling rights and aggregation intervals will be made <br />during Task 2 in consultation with the Sponsor's Committee. The current assessment of the <br />potentially controlling basin water rights is shown,in Table L Those rights thought to exert <br />the greatest influence, administratively speaking, are denoted by asterisks (*). <br /> <br />It will be necessary to. differentiate the rankS of the same priority class occurring at <br />different points in the basin to ensure that the distribution of shortages among the occurrences <br />of a, particular priority class is reasonable. The exact method of doing this remains to be <br />determined, but one possibility would be to order the instances by a "flow-weighted . <br />Administration Number" computed as the sum of products of seniorities and amounts for the <br />individual water rights aggregated into each arc, all divided by the total decree amount of the <br />arc. <br /> <br />6 <br /> <br />. <br /> <br />e <br /> <br />. <br />