Preliminary Study of the Effect of Sea Level Rise on the Resources of the Hayward Shore - California
The Hayward Area Shoreline Planning Agency (HASPA) had a preliminary study conducted on the impact of sea-level rise on the resources of the Hayward shoreline, and the actions that could be taken to protect both the wetlands and shoreline development in this area of the San Francisco Bay, California. Planning of the South Bay Salt Pond Restoration Project by the U.S. Fish and Wildlife Service addressed the projected change in sea-level within the HASPA planning area to the south of Highway 92. This area north of Highway 92 to San Leandro Creek (the Sea Rise Study Area) is assessed in this report. The goal of this project was to provide a preliminary assessment of the possible impacts, mitigations, costs, funding sources, and strategies to manage the affects of sea-level rise on both the natural and developed resources in the Sea Rise Study Area.
The 4.3 mile-long Sea Rise Study Area is composed of several successful wetland mitigation and enhancement projects that have been in existence for many years. These mitigation areas were developed based upon a consistent tidal regime to provide habitat and forage for many species. These areas also form a tidal buffer which protect both public and private improvements and facilities built along the inboard levees, and hence their continued existence is critical to the protection of this shoreline.
The report explains the shoreline "response" to sea-level rise including the effects on marsh and channel areas, human interventions, and potential shoreline resilience. Existing state guidance documents and legislation for adaptation planning are detailed. Projections of sea-level rise and shoreline inundation from sea-level rise are described for the study area. The particular vulnerability areas - such as tidal systems, storm drainage and landfills - are addressed individually with specific related locations. The report evaluates adaptation measures, such as "hold the line" hard armoring measures; realignment measures, which includes some measures of relocation and soft-armoring techniques; gradual steepening, which includes sediment management measures, diffuse armoring, and shoreline management planning needs. Potential funding sources are also identified.
Publication Date: March 2010
- Hayward Area Shoreline Planning Agency