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The Decommissioning of Cottonwood Creek, Site 15

机译：Cottonwood Creek的退役，遗址15

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Until 2011, Oklahoma NRCS had provided financial and technical assistance for the decommissioning of only two flood control dams: Cavalry Creek, Site 6 and Little Washita Creek, Site 13. Both dams had complex issues involving the presence of gypsum intheir foundations. Multiple attempts were made to address the foundation issues at each site, but both structures faced an increased probability for dam failure due to seepage and internal erosion. In each case, decommissioning the structure was chosenas the alternative of last resort. More recently, NRCS opted to decommission a third Oklahoma flood control dam. Unlike those previously taken out of service, Cottonwood Creek, Site 15 had no structural issues and was functioning as intended. Site 15 wasbuilt as a low hazard dam in 1965, but its classification changed to high hazard based on downstream development. However, it did not meet current safety criteria and performance standards for high hazard dams. Structural rehabilitation of the dam was shown as the recommended alternative in the August 2005 Supplemental Watershed Plan for the Cottonwood Creek Watershed. As Cottonwood Creek, Site 15 progressed from the planning to the design stage, many factors arose which caused the selected design alternative to be modified such that it no longer maintained a positive cost/benefit ratio. Though multiple attempts were made to salvage the rehabilitation alternative, decommissioning the dam was chosen as the selected plan of action. This paper will outline the path of Cottonwood Creek, Site 15 through the planning and design phases as well as the actual decommissioning of the structure. The obstacles encountered both by NRCS and the project sponsors and the efforts made to overcome them will also be discussed.
机译：直到2011年，俄克拉荷马州NRCS为只有两艘防洪水坝的退役提供了财务和技术援助：骑兵溪，遗址6和Little Washita Creek，网站13.两座大坝都有复杂的问题，涉及Gypsum Intheir基础的存在。进行多次尝试来解决每个站点的基础问题，但由于渗流和内部侵蚀，这两个结构都面临坝体失效的概率。在每种情况下，将该结构退役是Chensasas的最后手段的替代方案。最近，NRC选择退役第三俄克拉荷马防洪大坝。与以前脱离服务的人不同，Cottonwood Creek，网站15没有结构问题，并按预期运作。 1965年，现场15岁作为低危险坝，但其分类基于下游发育变为高危险。但是，它不符合当前的安全标准和高危险坝的性能标准。大坝的结构康复显示为2005年8月的推荐替代方案，为Cottonwood Creek流域的补充流域计划。正如Cottonwood Creek，网站15从计划进入设计阶段，因此出现了许多因素，这导致所选择的设计替代方案被修改，使得它不再保持阳性成本/效益比。虽然进行了多次尝试挽救康复替代方案，但将大坝的退役作为选定的行动计划。本文将概述Cottonwood Creek，现场15的路径，通过规划和设计阶段以及结构的实际退役。 NRC和项目提案国遇到的障碍也将讨论克服它们的努力。

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