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<br />. <br /> <br />I <br /> <br />This alternative would consist of replacing part of the <br />river diversion only. A 120 foot section of inflatable <br />bladder gate and a 10 foot radial gate would replace part of <br />the current board system. The remaining diversion will be <br />left intact. The ditch intake structure would also remain <br />untouched. This alternative would solve problems associated <br />with the current operational status of the diversion. <br />Lowering the bladder gate during times of high river flow <br />will greatly reduce the "wear and tear" on the entire <br />intake system. This structure will greatly reduce the sand <br />bar, which forms upstream from the current diversion thus <br />reducing the sanding problem in the ditch. The bladder gate <br />will also alleviate the problem of debris hanging up on the <br />structure. The cost of this alternative is approximately <br />$450,000, <br /> <br />4. Replace 200 feet of the river diversion structure with a <br />new bladder gate system and continue to use the existing <br />intake gates: <br /> <br />This alternative completes the provisions of alternative <br />number 3 but increases the length of the bladder gate to 200 <br />feet. The increased length of bladder gate would completely <br />alleviate the problems associated with the sand bar and <br />greatly reduce the sanding problem in the ditch. The cost of <br />this alternative is approximately $623,000. <br /> <br />The Selected Project <br /> <br />The RRLC plans to construct alternative #3. Features of this <br />alternative are as follows: <br /> <br />Sheet piling and pipe piling will be used under all the new <br />concrete structures for general stabilization and for <br />protection from undercurrents. Pipe piling will be placed in <br />an equally spaced pattern and the sheet piling will form the <br />perimeter of these structures. <br /> <br />The bladder gate and radial gate will have a monolithic <br />steel reinforced concrete floor. This floor will be <br />approximately 15 inches thick. <br /> <br />Wing walls and support walls will all he steel reinforced <br />concrete with a minimum thickness of 15 inches. <br /> <br />FeaSlbl11ty Study <br />Rive~side Reservol~ and <br />L&nd Company Oive~sion Structu~e <br />February 2000 <br /> <br />7 <br />