1- The Oosterscheldekering is the largest of the 13 ambitious Delta Works series of dams and storm surge barriers and it is the largest surge barrier in the world, 9 kilometres (5.6 mi) long. The dam is based on 65 concrete pillars with 62 steel doors, each 42 metres wide. It is designed to protect the Netherlands from flooding from the North Sea.
2- The Maeslantkering is a storm barrier with two movable arms; when the arms are open the waterway remains an important shipping route however when the arms close a protective storm barrier is formed for the city of Rotterdam. Closing the arms of the barrier is a completely automated process done without human intervention.
The Great Wall of Louisiana
Thames Flood Barrier