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<br />could be tolerated in a channel 360 ft wide. Various arrangements of <br /> <br />sand bars on both sides of the channel were also tested. In general, any <br /> <br />arrangement of sand bars which tends to increase the concentration of flow <br /> <br />within the upstream channel will affect the flow distribution at the struc- <br /> <br />ture, unless as stated previously, sufficient distance is available for the <br /> <br />flow to diverge. <br /> <br />Moving sand bars were studied with various arrangements of groins in <br /> <br />an effort to alter the flow distribution and to create sufficiently high <br /> <br />velocities in the restricted channel to accelerate the movement of the bar. <br /> <br />No satisfactory arrangement of the groins were found. <br /> <br />If a bar of significant size is deposited by a flood in the proximity <br /> <br />of the structure, the most practical and economical solution would be to <br /> <br />~echanically level off the top of the bar. <br /> <br />- r " ",~ <br />l' ~14::. .L i <br /> <br />-32- <br />