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<br />HABITAT AVAILABILIIY <br /> <br />Weighted usable area (WUA) was calculated for sites with multiple cross sections <br /> <br /> <br />using the step-back module ofRHABSIM. This model is equivalent to IFIM described <br /> <br /> <br />by Bovee (1982). The most downstream cross section in a cluster was located on a <br /> <br />hydraulic control point. Upstream cross sections were used to represent available <br /> <br />habitats in a run/rime sequence. <br /> <br /> <br />Depth and velocity criteria used in the biological component of the model was <br /> <br /> <br />developed for adult Colorado squawfish using radio telemetry (Miller 1997). Five <br /> <br /> <br />Colorado squawfish were implanted with radio transmitters in both 1996 and 1997. <br /> <br /> <br />These fish were located biweekly between July and October and habitat descriptions were <br /> <br />made based on 24 hour observations. Daytime Colorado squawfish habitat is primarily <br /> <br />restricted to pools over 2 ft deep, while nighttime habitat is more general and includes <br />shallower swifter areas (Miller 1992). <br /> <br />Results <br /> <br />Cluster Locations <br /> <br />Data for all cross sections are summarized and presented in Appendix Tables 1 to <br /> <br />6. Data for strata 6 and 8, are in Appendix 1 and 2, respectively. The data in appendices <br /> <br />1 and 2 are grouped by riffles (A), runs (B), and pools (C). Within each habitat group are <br /> <br />the results of inflection point identification (1), and the data and curves for the <br /> <br />relationships between flow and the six variables of interest, i.e. percent wetted perimeter <br /> <br />(2); wetted stream width (3); average depth (4); stage (5); width/depth ratio (6); and <br /> <br />velocity (7). <br /> <br />14 <br />