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100 <br />80 <br />P <br />E <br />R <br />C <br />E <br />T <br />F 60 <br />I <br />n <br />E <br />R <br />40 <br />20 <br />0 <br />10'1 <br />DIAMETER OF PARTICLE In MILLIMETERS <br />RIVER MILE 16.5 COBBLE BAR SURFACE SUBSTRATE <br />Figure 19 <br />w <br />1 10 102 103