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<br />\~ <br /> <br />be maintained at the level that was once attained by the existing old cone rete diversion <br />structure. The adjustable height weir will have a control system to lower the level of the <br />weir if the flow rate increases and raises the water level upstream from the dam diversion. <br />The proposed dam diversion is designed to carry the full 2415 c.f.s. with a very small <br />effect on the upstream water surfaee in Elkhead Creek. When the gate is lowered the <br />upstream water level will be increased by 0.3 feet above the tailwater depth of 6.84 feet <br />when the flow rate is 2415 c.f.s. The proposed dam diversion has no intermediate piers to <br />obstruct the flow in the strueture or to collect trash and debris. <br /> <br />The planned diversion structur~~a.?_~ stillin[ pasin to diss.ipate_the_energj of the_water_ <br />-flowing-,n-ETkhead-Creek -over the raised adjustable weir. A rock riprap section protects <br />the dam diversion from downstream erosion. The downstream cutoff for the structure is 6.6 <br />feet below the downstream channel invert. The planned dam diversion can tolerate a <br />considerable amount of erosion in the downstream channel before it is undermined and <br />seriously threatened. <br /> <br />The planned dam diversion will act as a grade stabilization structure for the channel of <br />Elkhead Creek upstream from the structure. <br /> <br />ff[~ <br /> <br />R E Florida <br /> <br />cc: John Fetcher, Upper Yampa Water Conservancy District <br />Mike Diluzio, Area Engineer <br />Dan Meyer. State Conservation Engineer <br />