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<br />December 2003 <br /> <br />Summary of Results from GCDAMP TWG <br />Multi-Attribute Evaluation Workshop <br /> <br />December 2003 <br /> <br />Lee Failing <br />Josh Korman <br />Carl Walters <br /> <br />1.0 Background and Purpose <br /> <br />This project was initiated as a result of a desire by the Glen Canyon Dam Adaptive Management <br />Program (GCDAMP) to develop a framework for evaluating management actions and <br />experiments. In May of 2003, a subset of the Technical Working Group (TWG) participated in a <br />workshop to develop and test a multi-attribute trade-off analysis (MATA) approach. Members of <br />the TWG who participated in the workshop supported the approach and recommended a second <br />workshop with broader participation of TWG members. <br /> <br />GCMRC is now in the process of updating its science/experimental program for 2004. To assist <br />in that process, the TWG conduc.ted a two-day workshop in December 2003 to evaluate options <br />using the MATA framework that was piloted in May. The objectives of the workshop were: <br />To demonstrate and refine the MATA framework for evaluating management options <br />To expose key trade-offs and uncertainties among management options <br />To provide input on experimental priorities for the coming 5-10 years. <br /> <br />At the workshop, participants reviewed and refined the endpoints (resource outcomes of <br />concern) and the attributes (quantitative metrics for assessing the impac.t of the management <br />options on the endpoints). They then identified management options and estimated the impact <br />of each option on each attribute. Key uncertainties and trade-offs were identified and <br />discussed. Participants were then asked to complete a questionnaire to elicit from them both a <br />direct ranking of options and a weighting of attributes. While there was not enough time to <br />review the results in detail, some high-level messages were reviewed and the implications for <br />experimental priorities were briefly discussed. <br /> <br />The intent of the workshop was to identify the options with the most potential to deliver <br />acceptable long term solutions. These options would then be candidates for experimental <br />treatments designed to reduce uncertainties about their effects. Thirty-one TWG members, <br />GCRMC staff and other observers participated in the workshop (Appendix A). <br /> <br />This report summarizes the endpoints and attributes, the options, the consequence table that <br />was produced at the workshop, the results of the ranking and weighting exercise, preliminary <br />implications for management, and proposed next steps. <br /> <br />2.0 Endpoints, Attributes, Options and Consequences <br /> <br />The refined endpoints and attributes are summarized in Table 1. TWG members defined and <br />evaluated twelve management options: <br /> <br />1. MLFF: Modified low fluctuating flows with ramping constraints as employed during the <br /> <br />1 <br />GCDAMP MATA: <br />December 2003 Workshop Report <br /> <br />02296 <br />