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' 3. Field Measurements <br />The field data collection for channel geometry and hydraulics was <br />completed throughout the 1987 summer field season. On May 6, six <br />transects were identified and marked with headpins and fenceposts to <br />identify differing hydraulic and biological conditions. Each transect was <br />assigned a weighting of 0.5 (Figure 7). The headstake elevations were <br />surveyed by differential leveling within acceptable accuracy. Permanent <br />and temporary staff gages were installed and checked. On May 8, the <br />streambed profile and velocity distribution for each transect was <br />surveyed. Distances between transects were measured along the water's <br />edge for both banks and a plot of the longitudinal profile prepared <br />(Figure 8). A reference map of the study site was drawn and field notes <br />reviewed. On Ma_y 28, August 8, and August 12 additional WSE's were <br />collected at each transect at flows of 9585, 2589, and 1194 cfs. On <br />August 12 during low flow conditions (1194 cfs), the stream was waded at <br />each transect so both the predominant and surrounding substrate particle <br />sizes could be recorded. <br />In general, the river at this site is a trough-like channel with a <br />slight bend midway. The transects represent run microhabitats with one <br />deep pool at transect 6 tTable 7). Cobble is the most commn substrate, <br />with sand, gravel and silt less abundant (Figures 9 and 10). Riffle and <br />backwater habitats are not present except during low flows when embayments <br />are formed. <br />~\ <br />24 <br />