Route 1 and 8 Tsunami Repairs and Revetment Shore Protection Design

The September 2009 tsunami that was generated near American Samoa caused inshore flooding and significant damage along the shoreline of the island of Tutuila, American Samoa. Coastal roads are main arteries for Tutuila, and road repair and shore protection for these projects have subsequently been designed for the U.S. Army Corps of Engineers. Sea Engineering, Inc. (SEI) performed field investigations and prepared Basis of Design reports, construction plans, and construction specifications for the shore protection projects.

There are five specific sites within three projects. Four of the sites will receive armor stone revetments along shorelines of 550 to 1,300 ft in length. The fifth project, which is nearly 2,300 ft in length, will result in two revetment designs—armor stone and Samoa Stone. Samoa Stone is a concrete armor unit specifically designed for Vatia, on the north shore of Tutuila, American Samoa (Sea Engineering designed the Samoa Stone installation for Vatia in 2002). The American Samoa government will decide which design will be final.

Additionally, one of the project sites is adjacent to an armor stone revetment designed by Sea Engineering and constructed in 2009.