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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Pneumatic crest gate systems, as well as radial gates, lift gates, and flash boards were <br /> <br /> <br />considered, The critical design issue w&lS to keep sand from being washed into the <br /> <br /> <br />Harmony Ditch No, 1. This is the problem with the existing structure. The new design <br />requires the river water to flow over the top of the ditch headgate (low approach velocity <br />with little sand), and at the same time river water flows out the bottom of the radial sluice <br />gate (where high velocity flow bypasses the sand downstream), <br /> <br />5 <br />