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o o c:::> ~ ~ en ~ Task 3 Conditional Water Rights Evaluation (This Task to be contracted out) - Once the depletions in Task 2 have been determined and distributed to hydrologic units, conditional water rights will be evaluated in each hydrologic unit or subbasin using the following criteria: - The most recent and complete Water Right tabulation, obtained for the State Engineer's water right database, will be sorted by water district, stream name. and priority. A second sort by water district, location, and priority may also be required for more efficient screening purposes in subsequent steps. - The water right tabulations will then be screened further by dividing the lists into a absolute water rights list and a conditional water rights list. As current gage records reflect what the absolute water rights have historically been diverting and consuming, we will assume such will continue in the future. Therefore, the absolute water rights can be saved at this point and no further use of that list will bc made in this effort. - Once the conditional water rights are tabulated, junior conditional water rights which are located in the same general location as a more senior conditional right will be eliminated from the list if both can not be satisfied from the physically available water supply in a wet year, such as 1984, or if the project is of a nature that it can not be justified if it does not receive significant water in average years. The competing water right elimination process will look at the water which would have been physically available in a reach, sum the senior conditional water rights located above that point, review the river calls and eliminate the junior water rights which are over and above the physical supply. - The contemplated draft of the conditional water rights will be estimated by reviewing the decreed uses and estimating consumption on a monthly basis. Standard rates of consumption will used for decreed purposes based on the best available information. The Board's previous effort used the following annual values: o multiple use decrees were assumed to use the most water for the highest consumptive purpose. Therefore, only one value at the highest rate was computed. Irrigation consumption was computed at 40% of the decreed amount over a ]53 day season. Commercial, Industrial and Municipal consumption was computed at 30% of the decreed amount on a year round basis. Domestic consumption was computed at 5% of the decreed amount on a year round basis. Storage consunlption was computed using the same values with no allowance for evaporation. o o o o The consultant will review this approach and the values suggested and recommend modifications, if necessary, to Board staff for approval. The consultant will compare the consumptive use values used by the Service on projects that have undergone Section 7 consultation to the water right decree consumption values for those projects calculated in this task and modify the water 11