Keta Coastal Defence

An $85 million (USD) beach stabilization, reclamation, and flood control project was required to restore and stabilize a severely eroded portion of the Ghana coastline. A design-build project format was selected using Great Lakes Dredge and Dock Company as the Contractor and Baird providing design services.

« See Other Projects in WaterfrontsWatersheds & Coastal Mgmt.

Great Lakes Dredge & Dock Company
Ghana, West Africa
View on Google Maps »
Ghana, West Africa

Project Highlights

The design-build format tested assumptions from the design phase during construction, allowing the design to be modified and optimized. There was over 15M m3 of dredging and four design/construct components.

  • Construction of an 8.3 km road/causeway, re-establishing a link lost to erosion
  • Sea defense works to prevent erosion
  • New flood control structure to provide relief from extreme flooding conditions
  • 122 hectares of land reclamation

« See Other Projects in WaterfrontsWatersheds & Coastal Mgmt.

Project Challenges

  • Address severe sand deficit and erosion rates of from 2 to 7M m3 per year.
  • Minimize downdrift impacts during groin construction.
  • No baseline data on site conditions.
  • Highly erodible sediments were present and exposed.
  • Control the release of periodic floodwaters from the areas surrounding the lagoon to the ocean.

Baird Solutions

  • Developed a system that allows sand to be retained, but also pass around to reach downdrift beaches.
  • Beach nourishment and groin construction allowed sand to begin to bypass the groin field system.
  • Developed and validated a wave hindcast to describe the site conditions.
  • Protection was extended far enough to protect erodible lagoon sediments.
  • Developed a flood control structure to address this issue and minimize erosion.

« See Other Projects in WaterfrontsWatersheds & Coastal Mgmt.