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<br />o <br />o <br />o <br />~ <br />"'--1 <br />U1 <br /> <br />o the best available hydrologic and conswnptive use data <br />o Colorado River and Upper Colorado River Basin Compacts <br />o generous long-term projections of future water development <br />o other information <br /> <br />On a statewide basis, the "Development Projection" is basically the amount of water available for <br />future development in Colorado under the Colorado River and the Upper Colorado River Basin <br />compacts. On a basinwide basis, it is the amount of water expected to be developed within each <br />basin based on full development of Colorado's compact apportionment. To maintain flexibility, <br />the sum of the "Development Projections" for each basin may exceed the amount of water that <br />is available on a state-wide basis under the compacts. This estimation process will include the <br />following major activities: <br /> <br />J) Estimate Colorado's total apportionment of Colorado River water under different defined <br />interpretations of the Colorado River and the Upper Colorado River Basin compacts, <br />2) Estimate the present level of conswnptive use of Colorado River water, and <br />3) Estimate the amount of water remaining to be developed within each subbasin based on <br />several possible methods of distribution. Distribution methods to consider include: (I) <br />basinwide priority system, (2) percentage of the total natural flow originating in a given <br />basin, and (3) any negotiated distribution that can be agreed on. <br /> <br />The following tasks describe the work to be done during this estimation process. <br /> <br />Task I Colorado Apportionment Analysis - This task involves the analysis of Colorado's Colorado <br />River Compact apportionment under different asswnptions. Since the Law of the River does not <br />address the issue of monthly apportionment, the analysis will be done on a annual basis. This <br />analysis is similar to the Bureau of Reclamation's "Hydrologic Determinations" required by P,L, <br />87-483, except that different asswnptions will be used. These asswnptions are: <br /> <br />A. Various assumptions of water supply available to the Upper and Lower Basins; <br />B. The U.S. Treaty obligation to Mexico will be evaluated under two asswnptions: <br /> <br />1) The Upper Colorado River Basins states are not obligated to provide any portion of <br />the Mexican Treaty obligation. <br />2) The Upper Colorado River Basins states are obligated to provide one half of the <br />1,500,00 acre-feet Mexican Treaty delivery obligation on an annual basis. <br /> <br />Task 2 ConsumPtive Use Evaluation - The present level of depletions for the major river basins <br />and subbasins will be estimated based on the Bureau of Reclamation's most recent "Consumptive <br />Uses and Losses Report", which is currently for the period 1981-1985. The six categories of <br />depletions as well as imports and exports listed in the report will be tabulated for each basin and <br />subbasin on a monthly and annual basis where possible. As part of this task, the recent work by <br />the State Engineer's Office and the Bureau of Reclamation on irrigated acreage and agricultural <br />conswnptive use will be evaluated and included in the assessment of conswnptive use as <br />appropriate. <br /> <br />10 <br />