Question

Dams help to preserve water and to check floods.
A.True
B.False

Answer 1

I think both true and false. because for this dam some places are not affected by flood but some places are affected easily for the same dam.
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Answer 2

A.True as it have been used to provide a store of water for agriculture,industrial uses,household uses,etc for thousands of years.
Reservoirs can act to prevent floods downstream by holding and regulating the flow during major flood events.