The Charleston Peninsula Coastal Flood Risk Management Study is a federal feasibility study that investigates coastal storm impacts on the Charleston peninsula. In partnership with the City of Charleston and its stakeholders, the study also explores economically-viable and environmentally-sound solutions to mitigate coastal storm risks. The feasibility study began in 2018 and is 100 percent federally funded through Emergency Supplemental Funding.
This feasibility study is one piece of the City’s overall comprehensive flooding strategy. In the last several years, the City has initiated several flood reduction strategies, including its Flooding and Sea Level Rise Strategy, a vulnerability assessment, rehabilitation of Low Battery Wall, Dutch Dialogues and major drainage projects. This study primarily addresses the risks of coastal storm surges. In conjunction with other flood mitigation efforts, the study also takes tidal flooding and sea level rise into account in its analysis.
In April 2020, the U.S. Army Corps of Engineers published a draft report outlining study findings and general storm risk reduction measures, including a perimeter storm surge wall with pump stations and nonstructural measures. Over the last several months, the study has used public and agency feedback, as well as results from ongoing modeling and analysis, to continue optimizing the proposed plan. Among some of the plan refinements include removal of the wave attenuator, reducing the project’s initial cost; increasing the sea level rise curve to evaluate more severe SLR scenarios; ongoing modifications to the storm surge wall alignment to reduce costs without impacting benefits; and additional detailed interior hydrological modeling.
Transition to an Environmental Impact Statement
In March 2021, the study transitioned from an Environmental Assessment (EA) to an Environmental Impact Statement (EIS). View the EIS Notice of Intent here. Conducting an EIS allows USACE to do a more robust analysis on project impacts and more clearly define measures to mitigate for those impacts. It also allows for expanded public engagement on the proposed plan through public meetings and release of a revised and updated draft report for public review.
- Public EIS Scoping Meeting (March 30, 2021): The study held a public scoping meeting March 30. View the event below and the Public EIS Scoping Meeting presentation.
- Charleston City Council Peninsula Workshop (Feb. 18, 2021): USACE provided an update on the study to City of Charleston City Council members in a public workshop Feb. 18, 2021. View the full meeting here.
- Interactive Presentation: The study team created an interactive site to help visually describe the selected plan, alternatives, history of peninsula flooring and more.
- Draft IFR/EA of April 2020: Draft Integrated Feasibility Report/Environmental Assessment documents from April 2020 are below.