Question

what do you mean by river dam mention its advantage and disadvantage

Answer 1

ADVANTAGES: 
1. Once a dam is constructed, electricity can be produced at a constant rate.

2. If electricity is not needed, the sluice gates can be shut, stopping electricity generation. The water can be saved for use another time when electricity demand is high. 

3. Dams are designed to last many decades and so can contribute to the generation of electricity for many years / decades. 
DISADVANATGES:
1. Dams are extremely expensive to build and must be built to a very high standard. 

2. The high cost of dam construction means that they must operate for many decades to become profitable.

3. The flooding of large areas of land means that the natural environment is destroyed.
I hope it helps you

Answer 2

ANS: A river Dam is a barrier to obstruct the flow of water, Especially one of earth built across a stream of river.

The following are the advantages of river dams:

1. It can be built to provide Drinking water, recreation, Flood Control and Also for power generation.

2. Electricity can be produce at constant rate.

Disadvantages :

1.   Lot of agricultural land is needed.

2.    sometimes it needs to remove the living population which is very difficult.

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