公众抗议程序
12月. 29, 2023
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三角洲岛屿和栖息地恢复
δ 岛屿
投资我们的未来
Providing water supplies for 19 million consumers and our economy cannot be at the expense of the environment. 我们大力投资保护自然资源. Our acquisition of islands in the Sacramento-San Joaquin δ allows us the extraordinary opportunity to help secure and guard the δ’s future. We are using the strategically located islands to explore ways to help improve the δ’s declining ecosystem and promote water reliability for those we serve.
而三角洲对南加州的供水很重要, 这是每个人都应该关心的地方. It’s the heart of California’s water delivery system and is vital to our economy, 多样化的生态系统, 以及数百万加州人的生活质量.
We contribute to science and re搜索 and identifying potential projects on the islands that support water system reliability, 恢复栖息地，促进可持续农业实践. 我们正在与州和联邦机构合作, 技术专家, academia and environmental organizations as we develop these studies and projects.
恢复的栖息地
The δ was once home to about 80 percent of California’s fishery species and the West Coast’s largest estuary. 它也是太平洋候鸟迁徙路线的一部分. But the original habitat that supported native species has been modified and looks significantly different than its natural state, 原因有很多, 例如农业复垦, 外来物种引进, 水改道, 地面沉降. The healthy habitat and food web that support native species are part of the delicate δ ecosystem, 许多鱼类的数量正在下降.
We are expanding scientific studies and re搜索 that can benefit ecosystem health in the δ. 岛上的一些地区提供以下机会:
- 发展鱼类的食物生产(浮游动物)
- Restore native tule vegetation to rebuild peat soils to increase land elevation and reduce carbon emissions, 同时保护饮用水源的质量
- 将部分土地转为非潮汐湿地, or preserve cultivated land with food for birds to improve waterfowl habitat and help protect threatened and endangered species
- 恢复潮汐湿地, 就像在奇普斯岛所做的那样, which 大都会 recently sold to the state Department of Water 资源 for this purpose
大都会获得了20美元的奖金.三角洲保护协会拨款九百万来修复韦伯大道.
管理风险，提升可靠性
通过三角洲的加州供水系统依赖于大约1,100英里长的堤坝保护农场, 城市, 和人民. For the δ islands, the levees surround subsided land that is below sea-level. These levees are vulnerable to earthquakes, floods and rising sea levels under climate change. 当堤坝倒塌时, 水涌进来, pulling in saltwater from the bay and impacting water quality before it can be delivered to Southern California, 旧金山湾区, 中央海岸和中央山谷.
We are working with our project partners to strengthen levees along the freshwater pathway, as well as ensure comprehensive emergency response to protect this vital water supply in the event of an earthquake or other disaster.
我们也在研究气候变化的风险, 管理泥炭土壤，减少碳排放, 加强堤防，改善水质，提高供水可靠性. 三角洲面临着许多挑战. We are committed to managing those risks for the benefit of those we serve.
项目的亮点
Activities on 大都会's δ island properties have focused on land use and habitat opportunities, 沉降逆转努力和应对气候变化的韧性.
漂浮湿地研究
培根岛大堤改善工程
堤坝监测
应急准备
农场租赁
三角洲岛改造计划
漂浮湿地研究
这是博尔丹岛的试点项目, 大都会之间的合作, DWR, 加州大学戴维斯分校流域科学中心和其他实体, 是研究漂浮泥炭湿地吗, 历史上存在于三角洲地区. 如果这些浮动湿地可以重新建立, 它可以改善生态系统，降低堤坝倒塌的风险.
培根岛大堤改善工程
14美元.500万英镑的培根岛改造项目得到加强.岛上西面堤防的7英里长. It enhances the water conveyance pathway in the central δ corridor and reduces the risk of a levee failure that would potentially impact water quality in the δ and for the State Water Project and Central Valley Project. This project was completed with a grant from DWR and through the collaboration of urban water agencies: Alameda County Water District, 康特拉科斯塔水区, 东湾市政公用事业区, 旧金山公用事业委员会, 圣克拉拉谷水区, 第七区水务局和大都会.
堤坝监测
The existing approach to levee maintenance looks at needs over a five-year cycle. 这是博尔丹岛的试点项目 evaluates the levees with a broad suite of technologies on a real-time basis to identify levee locations with critical needs, 有些可能是看不见的.
The program will allow for advanced planning to address levee maintenance and repair needs and could be applied at other 大都会 islands and DWR-sponsored levee programs.
应急准备
三角洲堤坝是否会因地震或其他自然事件而倒塌, an “emergency freshwater pathway” would have to be constructed for fresh water supplies to move north-to-south through the δ to the existing SWP and CVP pumping facilities.
DWR has stockpiled several hundred thousand tons of materials and equipment that can be quickly deployed in an emergency situation in the δ.
Webb and Holland tracts are two of the eight priority islands identified by the state for special protection because of their location in the western δ and potential to counteract saltwater intrusion. 大都会与DWR, U.S. 陆军工程兵团, and local reclamation districts on emergency preparation exercises and seismic analyses.
This project was completed with a grant from DWR and through the collaboration of urban water agencies: Alameda County Water District, 康特拉科斯塔水区, 东湾市政公用事业区, 旧金山公用事业委员会, 圣克拉拉谷水区, 第七区水务机构, 大都会, 和当地实体2028填海区和PG&E.
农场租赁
大都会还在其三角洲岛屿上租赁土地用于农业. These leases allow us the opportunity to evaluate alternative farming practices and alternative land uses.
三角洲岛改造计划
三角洲岛适应项目 seeks to improve the resilience and sustainability 大都会-owned islands in the Sacramento-San Joaquin δ. The project supports the state’s co-equal goals of ecosystem restoration and water supply reliability for California, 同时重视三角洲地区的发展.
The project calls for 大都会 to undertake a comprehensive analysis of opportunities for island-wide improvements. These enhancements include a mosaic of multiple land uses for stopping or reversing subsidence and promoting sustainable agricultural practices, 碳封存, 温室气体减排, 改善水质及恢复生境.
根据该法案拨款. 1 Watershed Restoration Grant, this collaborative planning process has two phases. The first will select one of the four islands owned by 大都会 (Bouldin岛, 培根岛, 荷兰束, 和韦伯大道)，为全岛提供了最好的机会, 景观尺度的场景规划. The second co-design phase will focus on 景观尺度的场景规划 for the chosen island, 其中包括开发和评估概念层面, 选定岛屿的多用途场景. In addition, 大都会 will develop future partnerships to support this restoration effort.