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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 />3) Remove the existing dam structure and replace with a new dam structure. <br /> <br />The existing dam is located where the existing topography allows a short dam <br />structure to create the reservoir and store reasonable quantities of water. The <br />existing dam materials have been tested and found satisfactory for use in the <br />proposed dam. To remove the existing dam would add unnecessary earthwork and <br />costs to the project, making this alternative not the most practical or cost effective <br />alternative. <br /> <br />4) Reconstruct and expand the existing dam to meet current standards and anticipated <br />needs. <br /> <br />This alternative would use the existing dam and onsite materials to the extent <br />possible. The dam would be designed and 'constructed to meet current standards <br />for reservoirs. The dam would be enlarged to meet the current and proj ected needs <br />for the Metropolitan Districts. Utilizing the existing dam structure and the existing <br />site is consistent with long range planning for use of its water rights by the <br />Powderhorn Metropolitan Districts. This alternative provides the most cost <br />effective and economical long term solution to meet the water storage <br />requirements and water needs of the Districts, and makes it the preferred <br />alternative. This alternative is discussed in more detail in the selected plan <br />description. <br /> <br />VIII. Selected Plan Description <br /> <br />The selected plan alternative for the Robbins Reservoir project is to utilize the existing <br />dam structure to the extent possible and expand the dam parameters to meet current <br />standards as well as sizing for future projected needs. The dam, spillway, and outlet <br />structure will be constructed to allow for required downstream releases and/or spillway <br />releases as may be required, such as for stream flow, snow melt and storm water runoff. <br />Robbins Reservoir will be a multi-purpose reservoir. The storage reservoir is important <br />to provide for the District's augmentation plans for storage of water from upstream <br />drainage basins, as well as transfer from other basins, and to provide for releases to <br />priority downstream users. The reservoir will also provide storage water for snowmaking, <br /> <br />11 <br />