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Creative Approach to Dam Breach Sediment Management

机译：大坝突破性泥沙管理的创新方法

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The lack of any low level outlet at the Ingham Springs Dam would have presented a significant challenge in control of water required for the construction of most rehabilitation measures. It presented equal challenges when dam removal became the selected alternative to addressing the 140-year-old earth dam's deficiencies. Significant sediment had accumulated in the impoundment over the course of the dam's history, but the cost of pre-breach dredging would be prohibitive. An "in-stream management" approach was also deemed as undesirable, so a hybrid sediment management plan was developed to limit the release of sediment from the reservoir as new stream channels were cut by the steady flow from the upstream spring. The work was sequenced to allow breach excavation to proceed while a sediment trap was formed at the downstream end of the breach to capture the sediment mobilized by channel-forming erosion. This approach allowed for timely regulatory approvals, reduced project schedule and cost and limited the risk for undesired downstream impacts.
机译：Ingham Springs大坝缺少任何低水位的出水口，将在控制大多数修measures措施所需的水量方面提出重大挑战。当水坝拆除成为解决已有140年历史的土坝缺陷的替代方案时，它面临着同样的挑战。在大坝的历史过程中，蓄积了大量的沉积物，但疏通前的费用将是过高的。 “流内管理”方法也被认为是不可取的，因此，开发了一种混合式沉积物管理计划，以限制由于上游泉水的稳定流动而切断了新的河道，从而限制了水库中沉积物的释放。对该工作进行了排序，以允许进行裂隙开挖，同时在裂隙的下游端形成一个沉积物捕集器，以捕获因形成河道的侵蚀而动员的沉积物。这种方法允许及时的监管批准，减少的项目进度和成本，并限制了不良下游影响的风险。

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