Charleston advances flood-resilience planning as city and Army Corps projects target chronic flooding

Charleston is moving forward with flood-resilience planning that could influence both public infrastructure priorities and future development rules in flood-prone parts of the city.

At its July 9 meeting, the Charleston Basin Flood Action Committee discussed flood-monitoring updates, resilience projects and a rewrite of the city’s zoning code. The rewrite is intended to modernize development standards and incorporate resilience measures.

Officials are also considering infrastructure priorities and possible overlay zones that could address development intensity in flood-prone areas. The meeting record describes those overlays as possible measures; it does not indicate that the zoning rewrite or overlays have been adopted.

Battery Extension remains a proposal

The City of Charleston and the U.S. Army Corps of Engineers are partnering on resilience work that includes a proposed $1.3 billion Battery Extension. City project materials describe the extension as a response to coastal flooding and sea-level-rise risks.

The $1.3 billion figure is a proposed project estimate, not a completed appropriation. The available materials describe planning and partnership activity and do not establish that the Battery Extension has received final construction authorization or full funding.

Other work cited in the city’s resilience agenda includes restoring historic brick arches beneath city streets, along with drainage improvements in West Ashley and on James Island. Those efforts are part of the broader focus on managing flood risks across areas tied to the city’s current planning discussions.

Flooding remains a recurring measure

Charleston’s 2026 approved budget and capital improvement plan records substantial annual counts of nuisance-flood days over the past several years: 68 days in 2020, 46 in 2021, 70 in 2022, 75 in 2023 and 54 in 2024.

The figures show that nuisance flooding continued even as the annual total changed from year to year. The 2024 count was lower than the 2023 total, but it still represented 54 days recorded by the city.

The planning now underway connects development standards with the city’s infrastructure and resilience agenda. For residents and property owners in areas affected by flooding, the potential changes could shape how future development is evaluated alongside drainage, coastal-flooding and infrastructure constraints.

No adoption date for the zoning rewrite or possible resilience overlays is identified in the available meeting record. Likewise, the project materials characterize the Battery Extension as proposed rather than a construction-ready, fully funded project.