Flood barrier

The Oosterscheldekering contains 62 steel doors, each 42 metres (138 ft) wide

The Maeslantkering closes the main entrance to the Port of Rotterdam, the largest port in Europe.

A flood barrier, surge barrier or storm surge barrier is a specific type of floodgate, designed to prevent a storm surge or spring tide from flooding the protected area behind the barrier. A surge barrier is almost always part of a larger flood protection system consisting of floodwalls, levees (also known as dikes), and other constructions and natural geographical features.

Flood barrier may also refer to barriers placed around or at individual buildings to keep floodwaters from entering the buildings.