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32 <br />used by razorback sucker was broadly defined based on data collected by Tyus and Karp <br />(1990). Ninety-five percent confidence intervals were calculated for depth and velocity <br />measurements (Tyus and Karp 1990) and expanded by about ten percent to describe a <br />conservative range of depth and velocity that would represent habitat where spawning <br />was documented based on historical data. The spawning habitat type was designated <br />class 22. Other habitat classes were defined arbitrarily. The resulting relations between <br />flow and habitat area were combined with daily hydrograph data to develop a time series <br />of habitat availability (Bovee 1998). For each site, time series of habitat availability were <br />constructed for the ascending limb of the runoff hydroperiod (1 April - 30 June) for <br />water years 2000 and 1984. The area and persistence of habitat classes over time were <br />summarized graphically using duration curves and compared. Flows during the runoff <br />and recessional hydroperiods combined with area of floodplain inundation curves for the <br />Green River near Ouray, UT (Muths et al. 1999) were used to estimate the extent and <br />duration of floodplain inundation for the years used in hydraulic simulations. Data from <br />2000 quantified conditions during the fish telemetry study and data from 1984 were used <br />to represent conditions during a year when razorback sucker reproduced successfully. <br />The habitat characteristics for congregations of fish observed during the telemetry study <br />were determined by overlaying the positions of individual fish with a composite habitat <br />map of the Green River site, developed for the discharge at which the fish observations <br />were made.