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<br />Aggradation <br /> <br />Local Effects <br /> <br />1. Channel degradation 1. <br />2. Possible change in 2. <br />river form <br />3. Local scour 3. <br />4. Possible bank <br />ins tabi 1i ty 4. <br />S. Possible dam <br />failure <br /> <br />14 <br /> <br />. . <br /> <br /> <br />. . <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />c <br /> <br /> <br />OrigInal Equilibrium Grode <br />~r~~tion of Dam <br /> <br />c' <br /> <br />Bose lne r <br /> <br />Upstream Effects <br /> <br />Aggradation of bed 1. <br />Loss of waterway 2. <br />capaci ty 3. <br />Change in river <br />geometry <br />Increase flood stage <br /> <br />. <br /> <br />A <br /> <br />Downstream Effects <br /> <br />Degradation <br />Reduce flood stage <br />Reduce base level for <br />tributaries, increased <br />velocity and reduced <br />channel stability <br />causing increased <br />sediment transport to <br />main channe 1 <br /> <br />. <br /> <br />. <br /> <br />Figure 2-3. Channel adjustment above and below a dam. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br />