A dam.
A dam is a structure that will hold back water, forming a reservoir behind the dam wall.
damns or dykes
leeves
A dam.
a dam.
A dam is built across a river to control the flow of water.
Weir
a dam
A dam is a structure built across the water to hold water back.
A structure built in the Nile river to measure water levels.
A dam or a water wheel to produce electricity from the water flow. Hooweestik.
A dam is built across a river to restrict the flow of water.
A weir is a low dam built across a river - either to raise the level upstream, or to regulate the water flow.
An overwater structure.
River, stream, waterway, brook, canal, or watercourse
Tigris river and the Euphrates river
If a dam is built across a river, water can be allowed to flow in a controlled way through turbines that generate electricity.