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Inner Harbor Navigational Canal (IHNC) Hurricane Protection

Photo: Gerwick
IHNC Hurricane Floodwall; New Orleans, Louisiana

The IHNC project is the largest civil works design-build project ever performed by the U.S. Army Corps of Engineers (USACE) and signifies the USACE’s commitment to the people of New Orleans to reduce future hurricane flood risk.

The IHNC Hurricane Protection Barrier is being built near the confluence of the Gulf Intracoastal Waterway (GIWW) and the Mississippi River Gulf Outlet (MRGO), a natural funnel identified as an area of critical vulnerability. This project is a key feature for improving hurricane protection for areas surrounding the nine-kilometer-long IHNC; the 1056-mile-long Waterway; and the MRGO, a 75-mile-long canal that provides a route between the Gulf of Mexico and New Orleans. The monumental project includes an approximately 2-mile-long batter pile surge wall and three gate structures.

The INCA/Gerwick Joint Venture is the lead Designer-of-Record for this design-build project as a subconsultant to Shaw E&I. Gerwick produced creative and practical solutions that reduced construction costs without compromising structural performance.

The engineering services have included a detailed design to construct a line of defense that will provide improved protection from surges produced by a 100-year hurricane. The work includes providing site development and storm surge barriers such as levees, floodwalls, and navigation structures.

As the Engineer-of-Record for this project, Gerwick produced creative and practical solutions that reduced construction costs without compromising structural performance. Gerwick was responsible for the concept and detailed design of the main sector gate monolith, batter pile floodwall, reinforced concrete by-pass barge gate, MRGO berm structure, GIWW approach walls, scour protection and other design items.

LAST UPDATED: 05.10.2012