Question

what are
demerits of dams

Answer 1

Social problem
It displace local people without rehabilation facility.

Economical problem
It consumes large amout of public money but fails to give proper output.

Environmental problem
It submerges surrounding vegetation, land etc.
which is home for many organisms and is used by local people also.
The sumbmerged land rots under anaerobic conditions fue to which harmfu gases are released.

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Answer 2

Here is your answer