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The establishment of w&t � er1te -a ifrvol -Ves defirr-ii how he <br />sue.' sso 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 cri er 1 iny-Qjv*..gather ng.pp.r#,t iag <br />ras ftmvporating entities. There will be water rights, compacts, and <br />decrees to be interpreted in developing operation criteria. The <br />operation cr, *teria-associated with power production, storage use, and <br />filling will also be-defined. Streamflpw maintenance and flood control <br />regulat.ionx are elso criteria to be considered. Following are the main <br />tasks for developing the water operation criteria: <br />1. Review existing operation studies Ao obtain and check ,,the <br />operatirst *ales employed. <br />2. Rem-Lew.-operational constraints and incorporate water decrees <br />act "regulations. <br />Water w: " putsd for all water -`us *s 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 dot4m is ..and. <sh9rtages in <br />the system. These requirements will allow analysis of water use and <br />efficiency in the system. <br />I� 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 (i ll development) condition hydrolcity data <br />base, and (3) build present condition` predictive operation study. The <br />Central - Platte OPSTUDY model was compiled in that manner and currefitly <br />is widely usgd. 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compute unpublished historic hydrology such as .system gains and losses.«.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. This work task corrects inflows, <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 prective operation models combines <br />the- present hydrologic data bass, the defined operating criteria and <br />water use requirements into a water accounting analy*4 s t '1*red3cts <br />changes- in flows, diversions, and reservoir storage with prescribed <br />changes -in operation. <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 Rivers by <br />1992 and the South Platte River by 1994. <br />15 <br />