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I I I I I I I I I I I I I I I I I I I 00'2301 Plan of Study SUB-TASK 4<1: I>erelop Basinwide Baseline Flow Data 33 Purpose The basin model requires a baseline flow data set against which operations of proposed reservoirs and projects are overlaid. In this sub-task the baseline data set required for modeling studies will be developed based on the results of Sub-tasks 4b and 4c. In general, we expect that the water rights structure of the basin can be reduced to a simplified representation by aggregating water rights which need not be operated explicitly in the basin model and which it can be assumed will continue to exert their historical depletion pattern. Water rights which must be considered explicitly will have been identified in Sub-task 4a. Except for water rights which will be operated explicitly, all absolute water rights in the basin will be assumed to operate as they have historically. This assumption will be implemented by including the depletions for these projects in the baseline flow data set. This will be equivalent to assuming that the Junlper-Cross Mountain rights are subordinated to all existing absolute water rights which in turn operate in relative priority as against themselves. The environmental baseline flow data from the USFWS will be modified to remove the effects of water rights and projects which might be explicitly operated in the model. This will result in a Modified Environmental Baseline data set. Approach 1) Operational data will be obtained for the projects and water rights identified in Sub-task 4a. Ideally, these data will be obtained from the USFWS so that the adjusted baseline flows will be consistent with the baseline flows used by the USFWS. If necessary, operational data will be obtained from other sources. 2) Modified baseline flow data will be developed by backing out the effects of operations of projects identified in step 1. 3) On tributaries where new projects may be evaluated, site-specific hydrologic data developed in Sub-task 4c will be used to disaggregate the baseline flow data as necessary. Output The products from this sub-task will include the data set of monthly baseline flows and a technlcal memorandum documenting the methods used in developing those data. .