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~~i~ GCDAMP TWG Multi-Attribute Evaluation Workshop, December 2003 Objectives of the Workshop This project was initiated as a result of a desire by the Glen Canyon Dam Adaptive Management Program (GCDAMP) to develop a framework for evaluating management actions and experiments. In May of 2003, a subset of the Technical Working Group (TWG) participated in a wor1<shop to develop and test a multi-attribute trade-off analysis (MATA) approach. Results of the workshop are summarizeifiiftl1e-attached'documenC(TWGMATAFinal Report May 2003). Members of the TWG who participated in the workshop supported the approach and recommended a second workshop with broader participation of TWG members. GCMRC is now in the process of updating its science/experimental program for 2004. At the December workshop, TWG members will evaluate proposed management options using the MAT A framework. The objectives of the workshop are: to expose key trade-ofts and uncertainties among management options and explore the values and preferences of TWG members, given these trade-offs to provide input on experimental priorities for the coming 5-10 years. The evaluation will consider preliminary results of recent experimental flows (2000 steady and Jan-Mar 2003 fluctuating flows), as well as the recent decision of AMWG supporting construction of a temperature control device at Glen Canyon Dam. In preparation for the upcoming workshop, the project team (Josh Korman, Lee Failing, Carl Walters, Ted Melis) has refined the evaluation framework based on feedback from the TWG. This includes modifications to the endpoints (resource outcomes of concern) and the attributes (quantitative metrics for assessing the impact of the management options on the endpoints). In addition to the attributes used at the May pilot workshop, we have added three vegetation attributes (Marsh/Spring, NHW2, and OHWZ), one for benthic community, one for boating safety/access, and one for Kanab Ambersnail and SW Willow Rycatcher. The management options under consideration and the estimates of their consequences are also being refined in preparation for the workshop. The range of options under consideration includes: flow options for sediment "management (beach building) fluctuating flow options to manage rainbow trout populations non-flow options for sediment management predator control options temperature control options Experimental options will initially be evaluated individually. Candidate experiments will then be combined into logical sets or strategies with consideration of compatibility, sequence and timing, To aid in the process, participants may be asked to complete a questionnaire designed to efficiently collect and summarize their views about the ranking of options and/or their value judgments about trade.offs among endpoints. We hope the workshop will help the TWG prioritize and clarify experimental priorities for the coming 5-10 year period (not including detailed experimental design). In addition, the TWG will gain experience with the use of multi-attribute methods to evaluate management options and insight into the nature of the trade-offs and residual uncertainties that will affect future decisions.