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<br />Fish Passage <br /> <br />For each rifile cross section, the deepest portion of the transect was identified (called <br /> <br />thalweg depth) and the hydraulic model was used to determine the thalweg depth at discharges <br /> <br />between 100 and 300 cfs. Following Burdick (1997) and Modde et al. (1999), a depth of30 cm <br /> <br /> <br />was assumed to provide enough depth for fish passage. <br /> <br />RESULTS <br /> <br />River Flows During the Study Period <br /> <br /> <br />The mean daily flow of the White River at the Watson gage from 1 August through 31 <br /> <br />October 1995 averaged 558 cfs and ranged from 427 to 922 cfs (Figure 5). For the same period <br /> <br /> <br />in 1996, the flow averaged 420 cfs and ranged from 237 to 607 cfs. <br />River Cross Sections <br /> <br />A total of 43 habitat clusters consisting of 2 cross sections per cluster were sample at each <br /> <br />of the 3 experimental flows. Appendix 3 provides a summary of the location and description of <br /> <br />each cross section. A typical river cross section showing the data collected and hydraulic <br /> <br />simulation is given in Figure 6. <br />Habitat Description by Stratum <br /> <br />All strata were dominated by rifile-run reaches; pools and eddies were usually secondary <br /> <br />components of main channel runs and riffies. Habitat composition among strata was very similar, <br /> <br />consisting of 32% rifile, 33% run, 10% pool, and 25% eddy habitat. Stratum 1, a meandering <br /> <br />reach with wide open floodplain and low gradient (0.05%) near the confluence with the Green <br /> <br />9 <br />