Between Land and Sea: An Approach for Resilient Waterfront Development along the San Francisco Bay

The waterfront along the San Francisco Bay is facing a growing threat from sea-level rise. By the end of the century, a projected sea-level rise of 55 in. [140 cm] will affect an estimated 128 sq. mi. [331 km 2 ] of urban development valued at $62 billion. In addition, 2.1 million people and 660,000 homes are estimated to arrive by 2040, adding to the 7 million current Bay Area residents. Furthermore, sea-level rise will affect the ecology of the San Francisco Bay, threatening to submerge the majority of existing tidal wetlands by mid-century. To combat sea-level rise, many are calling for increased shoreline protection, while others suggest the removal of urban development in areas at risk of inundation, allowing tidal wetlands to migrate to higher elevations. In this proposal, I demonstrate that both may be accomplished by a managed retreat of existing development, enabling wetland migration, while introducing a resilient new typology of development built on levees that is designed to co-exist with a tidal ecosystem, enabling new relationships between urban life and bay ecology that redefine the coastal boundary.