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<br />TABLE ~ <br />l_h..l <br /> <br />'" <br />TABLf-' <br /> <br />(IIIF~ <br /> <br />Particle-Size Data <br /> <br />The intermediate-axis particle-size data on the bed material, the <br /> <br />average upstream height and width of the particles, and the average <br /> <br />Krumbe i n roundness a r'e summa r i zed in tab I e 2. The average ups tream <br /> <br />height of the particles measured using the alternative method is highly <br /> <br />correlated with the SO-percentile diameter (dSO) measured using the <br /> <br /> <br />Wolman (19S4) method. Correlation coefficients showing the relation <br /> <br />between selected hydraulic data and bed-material data are shown in table <br /> <br />3. The correlation between dSO and the average upstream height of the <br /> <br /> <br />particles is 0.93. Seventeen of the 18 sites having particle-size data <br /> <br />on the bed material had a difference of 0.2 foot (6.1 mm) or less from <br /> <br />dSO' This indicates the more simple method measuring the particles' <br /> <br /> <br />upstream height is a good estimate of the bed roughness. The data on <br /> <br />the axis orientation of individual particles indicate that the long or <br /> <br />a-axis was vertical in 1 percent of the particles, that the intermediate <br /> <br />or b-axis was vertical in for 13 percent of the particles, and that the <br /> <br />short or c-axis was vertical in for 86 percent of the particles. This <br /> <br />I <br />axis orientation indicates that the particle offers the least resistance <br /> <br />to flow when the short axis is vertical. <br /> <br />).7 <br />