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<br />o 2) The Upper Colorado River Basins states are obligated to provide one half of the <br />o 1,500,OOI>acre-feet Mexican Treaty delivery obligation on an annual basis. <br /><:> <br />..- <br />~ Task 2 Consumptive Use Evaluation - The present level of depletions for the major river basins <br />m 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 welI 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 <br />by the State Engineer's Office and the Bureau of Reclamation on irrigated acreage and <br />agricultural consumptive use will be evaluated and included in the assessment of consumptive <br />use as appropriate. <br /> <br />~ <br /> <br /> <br />Task 3 Conditional Water Rights Evaluation IThis Task to be contracted out) - Once the <br />depletions in Task 2 have been determined and distributed to hydrologic units, conditional water <br />rights will be evaluated in each hydrologic unit or subbasin using the folIowing criteria: <br /> <br />The most recent and complete Water Right tabulation, obtained for the State Engineer's <br />water right database, will be sorted by water district, stream name, and priority. A second <br />sort by water district, location, and priority may also be required for more efficient <br />screening purposes in subsequent steps. <br /> <br />- The water right tabulations will then be screened further by dividing the lists into a absolute <br />water rights list and a conditional water rights list. As current gage records reflect what the <br />absolute water rights have historically been diverting and consuming, we wi\1 assume such <br />will continue in the future. Therefore, the absolute water rights can be saved at this point <br />and no further use of that list will be made in this effort. <br /> <br />- Once the conditional water rights are tabulated, junior conditional water rights which are <br />located in the same general location as a more senior conditional right will be eliminated <br />from the list if both can not be satisfied from the physically available water supply in a wet <br />year, such as 1984, or if the project is of a nature that it can not be justified if it does not <br />receive significant water in average years. The competing water right elimination process <br />will look at the water which would have been physically available in a reach, sum the senior <br />conditional water rights located above that point, review the river calls and eliminate the <br />junior water rights which are over and above the physical supply. <br /> <br />- The contemplated draft of the conditional water rights will be estimated by reviewing the <br />decreed uses and estimating consumption on a monthly basis. Standard rates of consumption <br />will used for decreed purposes based on the best available information. The Board's <br />previous effort used the folIowing annual values: <br /> <br />o <br /> <br />multiple use decrees were assumed to use the most water for the highest consumptive <br />purpose. Therefore, only one value at the highest rate was computed. <br />Irrigation consumption was computed at 40% of the decreed amount over a 153 day <br />season. <br />Commercial, Industrial and Municipal consumption was computed at 30% of the <br />decreed amount on a year round basis. <br /> <br />o <br /> <br />o <br /> <br />10 <br />