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33 <br />Table 2-2. Binary habitat criteria for salmonid passage (from <br />Thompson 1972) <br /> <br />Habitat criteria <br />Minimum Maximum <br />Species depth (m) velocity (m/s) <br />Chinook salmon 0.24 2.44 <br />Coho and chum salmon, 0.18 2.44 <br />steelhead and large trout <br />Other trout <br />0.12 1.22 <br />To calculate WUW, on the other hand, the stream transect is <br />uniformly divided into sections, each with a width, average depth, and <br />average velocity. The width of each section of the transect is then <br />multiplied by velocity and depth weighting factors which quantify, in <br />relative terms, the habitat value of each subsection and can vary <br />between 0.0 and 1.0 (Fig. 2-3). This product is summed for each <br />section to compute the WUW for the transect: <br />n <br />WUW = I W(vi) W(di) li, (2-5) <br />i=1 <br />where W(vi) = weighting factor for mean velocity <br />in the ith section, <br />W(di) = weighting factor for mean depth <br />in the ith section,