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Floodgates, also called stop gates, are adjustable gates used to control water flow in flood barriers, reservoir, river, stream, or levee systems. They may be designed to set spillway crest heights in dams, to adjust flow rates in sluices and canals, or they may be designed to stop water flow entirely as part of a levee or storm surge system.
The flood gates across the openings are circular segments in cross section, and they operate by rotating, raised to allow "underspill" to allow operators to control upstream levels and a complete 180 degree rotation for maintenance. All the gates are hollow and made of steel up to 40 millimetres (1.6 in) thick.
QDFG25 Flood Gate. This barrier is an impenetrable wall with lifelong use that expands in length to stop water from seeping indoors. It works as a sealant for entryways, placed in doorways as you ...
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 ...
Eight foot tall water filled barriers were used to surround Fort Calhoun Nuclear Generating Station during the 2011 Missouri River Flooding. Instead of trucking in sandbag material for a flood, stacking it, then trucking it out to a hazmat disposal site, flood control can be accomplished by using the on site water. However, these are not fool ...
Movement of the gates, lagoon on left, sea on right: (a) normal tides, gates are full of water and lie on the seabed; (b) when high tide is forecast, gates are emptied of water by pumping in compressed air; (c) gates rise above high tide, creating a barrier that temporarily seal off the lagoon from the sea.