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Gabion walls are used to prevent erosion on shorelines, stream banks, and slopes. They are also used as retaining walls, temporary flood walls and silt filtration for some dams, lining channels and river training. Gabion walls are also often used on small streams as fish barriers and to direct the flow of flow water in a different direction.
Hydro power plants are usually located inside the dams that hold back the rivers.
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Dams.
Walls to keep out water are called dams and levees.
These walls are called dykes or dams. (dijken in Dutch)
Irrigation.
Dams hold back water up to the level that they were designed for. They control/regulate the flow of water. Flood waters that come down rivers can be held back (up to the design point) from devastating places further down river. Coastal/sea flooding would not be stopped by dams - but sea walls and the like. Still, preventing river flood waters adding to coastal flooding might help the situation.
The same thing modern dams are used for. To hold back water.
Dams hold back water up to the level that they were designed for. They control/regulate the flow of water. Flood waters that come down rivers can be held back (up to the design point) from devastating places further down river. Coastal/sea flooding would not be stopped by dams - but sea walls and the like. Still, preventing river flood waters adding to coastal flooding might help the situation.
To hold back water
by building dams
A complex network of dikes, pumps, dams, and canals has been built. sudy island wha love k (;
Earth or concrete/steel dams.