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~ of the IFGIM that are utilized for determining management aspects of instream flow needs; (3) identification of possible improvements to the IFGIM's existing hydraulic simulation models; and (4) making recommendations pertaining to the addition of sedimentation aspects of instream flow into the methodology, Five specific improvements were identified as necessary for increasing the predictive capability of IFGIM: (1) an improved approach to predictin watershed response due to duration, quality, and frequency of flow including consideration of the impacts of forest harvesting, irrigated agriculture, grazing, mining, and other watershed management activities on the water and sediment yield from watersheds to stream channel; (2) increased capability of the spatial resolution of the IFG models to accomodate both upstream management plans of small watersheds and legal requirements for instream flow needs, environmental quality, and water resource management for a complete river basin or subbasin; (3) the models should not be area or regionally specific; therefore, the models will require site-specific calibration data and regionally specific species response criteria; (4) the model should be able to explicitly represent management activities and simulate the system response resulting from these activities; and (5) increased capability to assign probabilities to climatic and spatial variables. In additi.on to the foregoing improvements the following characteristics are desired in predictive models: (1) they should be functional within the constraints of limited data; (2) they should be oriented for use by management personnel and applicable to specific decision-making processes; (3) they should possess the capability of making predictions at different levels of accuracy and resolution depending on purpose of the assessment; (4) the computer software system should adopt a modular approach; and (5) the models should be properly documented. ~ 9 17