Philippine village uses bamboo and oyster shells to stop coastal flooding

Residents of Pamarawan, a fishing village on Manila Bay in the Philippines, used bamboo poles, oyster shells, and coconut husks to build a nature-based coastal defense system.

This initiative replaced a reliance on concrete breakwaters that previously failed to stop waves from reaching homes during typhoons and monsoon winds. The project covers 14 hectares of coastal waters and uses bamboo cribs to reduce wave energy and trap sediment.

The village officials say the defense system has prevented flooding for nearly two years. This protected the community during severe floods in August 2026 that submerged neighboring areas in Bulacan province. The system also uses coconut-husk mesh bags filled with discarded oyster shells to weaken waves and create a suitable environment for oyster reefs to return. The strategy aims to restore the natural protections the village lost when mangrove forests were cleared for fishponds and land reclamation.

As sediment builds up around the bamboo structures, the seabed rises to allow for future mangrove planting. Local fishers report that the structures also attract marine life like crabs and shrimp while reducing the amount of waste reaching the shore. The Malolos City government allocated 130 million Philippine pesos to fund the project, which was designed with help from the Dutch firm Haskoning.

While Philippine authorities consider the project as a model for other flood-prone areas, the engineers warn that the design must be adapted to the specific geological and ecological conditions of different coastlines.