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I I I I I I I I I I I I I I I I I I I BOR CDC:M CRFP ewc ewC/DATABASE GHC FWS FWS/DATABASE HSI IFIM NEC PHABSIM ABBREVIATIONS AND SYMBOLS Bureau of Reclamation Colorado Division of Wildlife Colorado River Fishery Project: a special project of the FWS begun in June 1979 to investigate the habitat needs of the rare and endangered fishes of the Upper Colorado River Basin. Colorado Water Congress A common format computerized database of information collected on the mainstem fishes of the Upper Colorado River Basin from 1964-1984; assimilated by Tom Pitts and Associates for the Colorado Water Congress. General Habitat Constraint U.S. Fish and Wildlife Service A collection of variable-format datafiles containing information on the mainstem fishes of the Uppe-r Colorado River Basin from 1964-1986, including ewC/DATABASE. Habitat Suitability Index: represented as HSI curves, which are an integral component of IFIM, and are graphic representations of relative preferences or tolerances for variables (depth, velocity, substrate, cover, temperature) that are important to the well-being of the species. Indices range from 0.0 (nonuse of habitat) to 1.0 (optimal habitat). Instream Flow Incremental Methodology: a habitat-based tool for evaluating environmental changes in streams and rivers. IFIM contains a series of mathematical, empirical, and conceptual models that are used to compute habi tat availabili ty under various water management alternatives. Biological information enters the IFIM at three places: as input to the PHABSIM, in the integration of water quality and temperature to compute total habitat, and in the population models. National Ecology Center, formerly Western Energy and Land Use Team (WELUT) Pysical Habitat Simulation System: an integral part of IFIM. A combination of components that are linked together to provide a defini tion of the physical aquatic habitat in relation to flow regime, water quality, and physi cal structure of the stream. xiii