Flood Barrier

Flood Gate

Flood gates are designed to control the flow of water around levees, in rivers, streams and reservoirs. They help to keep water at manageable levels so that flooding can be avoided. Also called crest gates, these structures are designed to keep water surface level low enough that they don't pose a risk to the area and the people that live there. If a body of water such as a stream, canal or river begins to get too high, flood gates may be opened so that the water build up and overflow is minimized. This “extra” water may be allowed to flow into a detention basin so that flooding is avoided. There are six primary types of flood gates. They include radial, roller, bulkhead, drum and hinged crest gates.

Bulk Head

Bulk head gates have sections that can be moved so that water can flow underneath them. The sections can also be left in place to so that water is able to flow over the structure. Other designs can slide back and forth, from side to side, so water can pass through.

Radial Gates

Radial gates use a cylindrical design. They may move up and down or side to side to side so that water can pass through as well.

Hinged Crest Gates

Hinged crest gates can move both horizontally and vertically. They are designed to help decrease the level of water in a dam when it gets too high. Extremely high water can pose a huge threat to the surrounding area. This threat is increased if people live nearby. There are four types. They are Pelican, Fish Belly, Flap and Bascule.

Drum Gates

Drum gates float on top of the water. They can be raised so that water can flow in the depressed area underneath them. This helps to control water levels.

Roller Gates

Roller gates are cylindrical in design. This type of flood gate uses a chain to adjust their position. They move up and down and allowing water to flow underneath them.


Fusegates have become a more popular way to prevent floods. They do not require any type of hydraulic or external power source. They are used primarily in dams and have been used on scores of them worldwide.

Floodgates are used to control water levels in bodies of water which can pose a threat to surrounding areas. They are constantly used in rivers, reservoirs and streams. They can also be utilized to keep water levels which surround levees, at low enough levels that they don’t pose a threat. They are also used quite often in dams. Floodgates work by allowing water to pass from one area to the next, so that water levels drop in areas that are close to overflowing.

Floods can cause a tremendous amount of damage. Cities that are situated in areas that flood regularly will often take measures to provide it residents. Floodgates are one option that works tremendously well. There are many types of floodgates. The most common ones include fusegates, drum, roller, bulkhead, hinged crest and radial gates. Each of these basically serve the same function, they just accomplish it in a slightly different way.

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