The most common barriers used on dams and major waterways are radial or fuse gates. The radial gates are controlled both mechanically and manually. The flood gates open and close in response to the level of water in a dam. When the sensors rise to a certain level, the valve opens and releases water. Some radial gates are connected to hydro-energy plants and water is released to the plant then returned to the dam from the plant. For more discussion of this topic, check the links below: flood restoration, water damage, flood south auckland Source: Free Articles from ArticlesFactory.com