Question

4. A flowing river is sometimes blocked by building a wall. This is called a ________​

Answer 1

Answer:

A dam is a barrier that stops or restricts the flow of surface water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aquaculture, and navigability.

Answer 2

A flowing river is sometimes blocked by building a wall. This is called a dam.

Explanation:

• Dam is a barrier that stops or restricts the flow of river water.
• the main purpose of dams is for storage and safe retention of water.
• The storage and retention of water is done for various purposes like irrigation, hydropower, recreation, water supply, flood prevention etc.
• Dams control dam impound flood waters.
• It releases the flood water under control to the river below the dam or store or divert the water for other uses.
• The flowing water is blocked by dams and is treated and distributed in nearby towns and cities for drinking purpose.
• The river water blocked by dams is used to generate electricity through hydro electric power.
• The river water is blocked by dams as dams prevent fish migration.