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<br />C' <br /><. <br />c:. <br /> <br />additional storage space in the reservoir from another shareowner. For the purposes of the <br /> <br />model, surpluses in a particular month were shown as positive values on summary output such <br /> <br />as Table 8 and were then considered to be lost for use in any subsequent month. In other <br /> <br /> <br />words, the model did not attempt to reallocate surpluses from one account to another. <br /> <br />The demand-based system operation model was used to evaluate water supply conditions <br /> <br />under present cropping patterns and irrigation systems for the historic runoff that occurred in <br /> <br /> <br />the periOd 1951-1983. That period was selected because it was hydrologically representative, <br /> <br />streamflow data were available, and it was the period used in previous Phase \ investigations. <br /> <br /> <br />Each year in the period 1951-1983 was classified either as a wet, dry, or average year based on <br /> <br /> <br />annual precipitation at Norwood such that each category would have an equal number of years. <br /> <br />The results of these analyses were summarized by parcel into average monthly <br />surplus/shortage values for the average, wet, and dry year conditions and are shown in units of <br /> <br />acre-feet on Tables B, 9, and 10, respectively. The key providing the correspondence between <br /> <br />parcel number and owner is given in Table 11. Parcels 150 and 151 represent composite areas <br /> <br />for the Gurley and Cone systems, respectively, for shares not accounted for during the irrigator <br /> <br />interviews. Municipal demands are not shown in the summary tables, but water and reservoir <br /> <br />storage allocated to the Wrights Mesa Rural Water System were accounted for by the model <br /> <br /> <br />and not used for irrigation purposes. Evaluation of the average monthly surplus/shortage <br /> <br /> <br />conditions shows that significant shortages exist for the whole service area. Through iterative <br /> <br /> <br />application of the model, it was estimated that only about 30 percent of the land presently being <br /> <br /> <br />irrigated could possibly receive a full water supply in an average year. <br /> <br />Additional analyses were performed using the demand-based system operation model to <br /> <br /> <br />evaluate the water supply situation on a parcel-by-parcel basis for the 1990 irrigation season. <br /> <br /> <br />For illustrative purposes, the results of the March projection are discussed herein. The runoff <br /> <br />10 <br />