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Dam Safety Program

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水域认识到潜在坝故障的灾难性本质,并经营着全面的大坝安全计划来保护公众。

Through the dam safety program, it ensures the continued operation of its 10 major dams. The water district also works closely with state and federal regulators, and downstream emergency response partners to meet these goals.

The Dam Safety Program includes four main components:

1. Periodic special engineering studies
As geotechnical and geological professionals study catastrophic events worldwide and gain new understandings of earthquakes and their associated impacts on dams, the water district periodically undertakes special engineering studies to ensure that its dams are compliant with the latest design guidelines and regulations. Like building codes, the methods and analysis used in the 1970s and 1980s are now outdated and require modification to keep pace with the growing body of knowledge surrounding earthquakes. In addition to seismic studies, the water district periodically conducts other special engineering studies to minimize the risks to its dams.

Water district engineers and consultants are studying earthquakes and seismic risks as it relates to dam safety. Engineers are currently undertaking extensive seismic stability studies at Anderson, Almaden, Calero, Guadalupe, Stevens Creek and Lenihan dams.

Anderson, Guadalupe and Calero dams are already known to have seismic issues, and those dams, along with Coyote and Almaden, are operating under storage restrictions to protect against downstream flooding in the unlikely event of a catastrophic failure from a massive earthquake. Studies for Uvas and Chesbro dams begin in 2012.

地震稳定性评估通常研究大坝承受大地震中强烈摇动的能力,以及大坝下面的任何故障是否可以移动和造成损坏。

特别令人担忧的是许多水坝中发现的砂质或砾石土壤的松散层,这可能在大地震期间经历强度(称为液化)的强度减少。如果地震的强度足够大,大坝的侧面可能会变形并可能导致显着损坏。如果发现大坝在这些研究中缺乏,水域将使水将水降低到安全水平,同时将大坝与建筑项目固定。

Every five years, the Federal Energy Regulatory Commission (FERC) requires the water district to bring in a team of independent experts to inspect Anderson Dam, evaluate all conceivable potential risks to the dam and develop strategies to minimize these risks. Though not required by the regulatory agencies, the water district has proactively expanded this potential failure mode analysis approach to the remainder of our dams. By the end of 2012, it will have completed potential failure mode analyses for Anderson, Almaden, Calero, and Guadalupe Dams.

2. Surveillance and monitoring
仪器中的仪器提供水域工程师的数据,以确定结构是否正常运行。

水域在五大水坝拥有自动化仪器。当参数超出设定阈值限制时,设备能够收集,检查,录制和存档收集的数据和警报人员。

水域不断监控其水坝的条件。监测两种基本参数:水渗漏通过大坝和结构的物理运动。压电仪测量大坝和五个水坝的水压,每日读数到位于大坝嵴的发射器通过卫星在水域办公室。大坝和表面纪念碑中的倾角系测量坝运动。

3. Dam inspections and maintenance
A good maintenance program will protect a dam against deterioration and prolong its life. Dams can deteriorate if not properly maintained. The water district’s inspection and maintenance program carefully maintains all of its dams to ensure public safety.

水域经常检查并监控每个大坝的状况,并为加州水利部的水坝安全部(DSOD)的安全部门进行年度监测报告。我们与Anderson大坝的DSOD和FERC合作,以确保我们的大坝继续安全运行。每年,除了我们的常规内部检查外,水域共同检查了每个大坝与DSOD。

4.紧急响应和准备
在大坝安全计划的核心,应急响应和准备是其后地震大坝评估计划团队。经过大量地震后,训练有素的人员检查水坝是否有任何损坏或失败潜力的迹象。

水域每年与各种机构合作。在大坝安全计划下,水域正在开发更新的地图,估计在大坝失败的高度不太可能发生的情况下估计哪些领域。Anderson Dam的淹没地图于2009年更新,并与适当的下游紧急响应合作伙伴共享。