Sea Level Rise
Preparing the county for sea level rise will require a coordinated effort among cities to plan and implement solutions such as wetland restoration, horizontal levees, and sea walls. San Mateo County has taken steps in this direction with the creation ofOneShoreline, a government agency that works across jurisdictional boundaries to plan and implement sea level rise resilience measures in the county. The County also conducted a countywideSea Level Rise Vulnerability Assessment to identify areas that will be impacted by flooding and erosion and provide solutions.
This coordinated effort should be replicated across the Bay Area. Cooperation between cities and counties throughout the Bay Area is necessary to ensure that shoreline protection in one area doesn’t result in greater flooding in others. This could happen, for example, when a sea wall in one city deflects storm surges towards an adjacent city without flood protections. There should also be coordination at the state and federal level to provide funding to low-income cities that may not otherwise have resources for sea level rise planning. The San Francisco Bay Conservation and Development Commission (BCDC) is currently creating guidelines to shape local sea level rise plans.
Inland Flooding
Cities must invest in updated stormwater infrastructure to reduce flooding and capture and clean stormwater before it reaches our waterways. In particular, green stormwater infrastructure (GSI) uses natural systems like vegetation, soil, and permeable surfaces to capture stormwater and filter out pollutants. Examples include rain gardens, bioswales, and tree wells. When cities upgrade streets, parks, and other infrastructure, they could be incorporating GSI at the same time, making these new investments more flood resilient. San Mateo County is supporting this kind of integrated planning with theirSustainable Streets Master Plan.