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. 1'l:1,,7tl (.,., Ju. ...'1: . - Investigation of identified Phase 1 problem areas (e.g. ,East River) ; consideration of diversion and return flow analysis suggested - Update/modification of CRSS virgin flow estimates - Computerization of entire virgin flow development procedure; would simplify future flow revision and updating; would facilitate sensitivity analysis and error analysis for review process. Subcommittee Review Discussion Summary: . . -- Subcommittee discussions of review process indicated the need for a comprehensive review. The need for close coordination with consultant activities was stressed. A more comprehensive review of assumptions and data utilized in developing CRSS Gunnison River at Crystal Darn virgin flow estimates was suggested; Flows for this station were used as a base against which upstream flow estimates were balanced; any errors in flow development at this station are carried to upstream estimates; Computerization of virgin flow development process was seen as a means of providing comprehensive review capability (sensitivity/error analyses) -- Test basin selection (e.g., East River or Ohio Ck.) for comparison of recommended flow computation revisions with base case conditions was seen as a review option; The East River basin was identified in the draft review memo as a possible test basin; Phase 1 results did not adequately represent historic shortage conditions within the basin. It was suggested that prior to the initiating East River basin studies, Denver Office personnel meet with the technical subcommittee for familiarization with East River hydrology complexities. Subcommittee review indicated the East River to be represented in adequate detail in the Phase 1 network. This raised the possibility that improved East River hydrology representation may be obtained by the inclusion of diversion and return flow arcs. This was seen as a consultant's model configuration activity -- precluding the need for a Denver Office special study. (Discussions of East River Phase 1 problems at 09/12/91 consul tant selection interviews indicated that while East River flows calibrated well at the mouth, the shortage representation problem may stem from distribution of total flows upstream (Oh-Be-Joyful? Roaring Judy?:_ Based on these comments, additional East River studies may be warranted. ) Implementation of recommendations stemming from the review process may necessitate recalculation of Phase 1 flows;