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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 />Alternate G - This alternate is similar to Alternate F. Reconstruct the existing <br />spillway on the south side of the reservoir to a width of 30 feet and lower the <br />spillway crest roughly 12.5 feet. Use the existing inlet channel for the proposed <br />inlet channel. Leave a remnant reservoir pool to control sedimentation and icing <br />condition problems during water diversions. <br /> <br />The following two alternatives were also identified and eliminated from <br />detailed analysis. <br /> <br />Reolace the Dam with a New Structure of the Same Size - In our OpiniOn, it is <br />economically infeasible to remove the existing structures and build a new dam and <br />spillways to safely pass the "half" probable maximum flood. In order to maintain the <br />present storage capacity, it will be necessary to remove the dam and construct a new <br />structure that is designed to withstand complete overtopping by floodwaters. Soil <br />cement or roller compacted concrete would be required. Costs would be in excess of <br />one million dollars. <br /> <br />UOQrade the ExistinQ Dam - In our opinion, it is economically infeasible to modify the <br />existing dam and spillway to safely pass the "half" probable maximum flood. <br /> <br />Alternatives A, B, C, 0, E, F, and G are described in more detail, and <br />design/operating issues discussed in Appendix B. <br /> <br />A topographic map of the Keeton Dam site is shown on Figure 3. <br /> <br />26 <br />