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o o '=' ..- Q ""-J Q Domestic consumption was computed at 5% of the decreed amount on a year round basis, Storage consumption was computed using the same values with no allowance for evaporation. Q 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 right decree consumptive use values accordingly. After performing this analysis on an annual basis, the consultant will develop monthly flow distributions for the different use types, by hydrologic units if appropriate, and provide them to Board staff for review and approval. Task 4 Determination and Distribution of Remaining Unused Apportionment - This task will determine and evaluate the different methods for distributing the unused apportionment, This will include various distribution scenarios of the unused apportionment showing, in tabular form, the total compact apportionment for each river basin on a monthly and annual basis. For this task, the following distribution methodologies will be used: Basinwide Priority - This methodology assumes that the distribution of the unused apportionment will be based on the State's priority system; and that Water Division 4, 5, 6 and 7 will be considered as one river basin for administration purposes. Conditional water rights for each Water District will be listed by priority date and the lists will be combined to include all conditional water rights in the Colorado River basin by priority date. The remaining unused apportionment will be distributed by priority to the basins and subbasins with the senior conditional water rights until Colorado's unused apportionment is exhausted. The priority date on which Colorado's apportionment is exhausted becomes the cutoff date beyond which additional development would have to be conditioned or limited in some manner. The availability of the physical water supply will be reviewed to assure that there is water physically available to the identified rights at least in a wet year. Subbasin entitlement - The following methodologies will be considered: I) - total depletions allowed from a basin or subbasin will be proportionate to the natural flow contribution as determined in the above task; and 2) - other methods will be reviewed and analyzed for appropriateness in distributing unused apportionments, including any negotiated agreement. Task 5 Effects of Full Development on Stateline Flows and Colorado River Reservoir Operations - Once the various distribution scenarios have been identified that will be used in determining the distribution of total compact apportionments, CRSS will be used to evaluate the impacts of these distributions on Stateline flows and operations of the Colorado River reservoirs. The Bureau of Reclamation's natural flow database (1906 - 1990) will be used for this analysis. In addition, other hydrologic data sets may be utili1.ed as requested. The work products will 11