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<br />~ <br /> <br />OOCG4J .. <br /> <br />. <br /> <br />.. <br /> <br />The establishment of water operation criteria involves defining how the <br />system operates 90 it can be interpreted into predictive operation <br />models for the Platte, North Platte, and South Platte Rivers. The task <br />of defining the operating criteria will involve gathering operating <br />rules from operating entities. There will be water rights, compacts, and <br />decrees to be interpreted in developing operation criteria. The <br />operation criteria a~~uciated with ~w~r production, storage use, and <br />filling will also be defined. Streamflow maintenance and flood control <br />regulations are also criteria to be considered. Following are the main <br />tasks for developing the water operation criteria: <br /> <br />1. Review existing operation studies to obtain and check the <br />operating rules employed. <br /> <br />2. Review operational constraints and incorporate water decrees <br />and compact regulations. <br /> <br />Water use requirements will be computed for all water uses in the basin; <br />irrigation, municipal, industrial, recreation, water quality, river <br />evapotranspiration, ground-water pumping, power, fish, wildlife, and <br />other mandated requirements. The fish and wildlife water requirements <br />will be discussed in a separate activities schedule. The water use <br />requirements will be utilized in the operation studies to determine the <br />surface water diversion and the resulting deliveries and shortages in <br />the system. These requirements will allow analysis of water use and <br />efficiency in the system. <br /> <br />The development of the operation study model will be performed in a <br />three-step process; (1) develop a corrected historic hydrology data <br />base, (2) develop present (full development) condition hydrology data <br />base, and (3) build present condition predictive operation study. The <br />Central Platte OPSTUDY model was compiled in that manner and currently <br />is widely used. The historic hydrology data base is developed to <br />compute unpublished historic hydrology such as system gains and losses. <br />This historic hydrology data can be analyzed for changing trends in <br />runoff, return flows, and water use. It also defines the reaches of the <br />river system for which there is known data for the study period. The <br />development of a present (full development) condition hydrology data <br />base is necessary to account for changes in system operation and water <br />use through out the study period. Thia work task corrects inflowa, <br />diversion, storage use, and reach gains or losses to current day full <br />development as defined by water rights, decrees, compacts, and <br />contracts. The development of the predictive operation models combines <br />the present hydrologic data base, the defined operating criteria and <br />water use requirements into a water accounting analysis that predicts <br />changes in flows, diversions, and reservoir storage with prescribed <br />changes in operation. <br /> <br />Table 3 displays work tasks to be accomplished for the time period <br />between fiscal year 1990 and 1995. These work tasks are scheduled to <br />accomplish operation studies for the North Platte and Platte Rivera by <br />1992 and the South Platte River by 1994. <br /> <br />15 <br />