Detailed Design Report | TCAP | Nanumea island | March 2021

Under the Tuvalu Coastal Adaptation Project funded by the Green Climate Fund, Nanumea island was selected for coastal protection infrastructure due to the severity of the damage incurred following the passage of Tropical Cyclone (TC) Pam in 2015. The funding application to the Green Climate Fund proposed that TCAP resources finance locally appropriate coastal protection measures along the high value zone (1330m) in Nanumea. 

This detailed design report contains the basis of design, structure parameters and the project implementation framework for the island. In summary, the Nanumea interventions will consist of:

• A 1,330m of Berm Top Barrier (BTB) constructed on the western coast of Nanumea constructed from buried geotextile mega containers (GMC) approximately 20m long, the BTB will raise the height of the storm berm by around 1500mm. The GMC will be filled and buried under 37,100m3 of sediment sourced from the southern tip and lagoon flanks of Nanumea located a maximum of 4,000m from the project site. The BTB will be planted with local vegetation on the crest of the BTB alignment.
• A 180m concrete Seabee revetment will be constructed in the Village centre to replace a file seawall in this location.
• Seven 25m long FRC reeftop barriers will be keyed into the reeftop 35m offshore of the western shoreline of Nanumea.