How is the construction of huge dams harmful for the environment?
Answers
Answer:
Dams are being construction on big rivers for purpose of irrigation hydo-electricity, canals, fishing, water transportation to and flood control, About too dams have been constructed after independence. These dams are useful for the generation of electricity, storing water for irrigation and drinking purpose. Recreation facilities life boating fishery development etc. However along with these benefits large dams also have some adverse effects on the environment whenever a river valley project is started the construction of houses for the workers. Construction of roads, railway and underground tunnels becomes essential. As a result the greanery site disappears. The artificial lakes made from the huge dams drowns forests and form land. The alkalinity of the land increases due to water drained from the canals of the dams and its fertility decreases. Due to the prevalence of continuous water in dams and canal areas nearby land becomes unsuitable for agriculture.
Explanation:
One of the first problems with dams is the erosion of land. Dams hold back the sediment load normally found in a river flow, depriving the downstream of this. In order to make up for the sediments, the downstream water erodes its channels and banks. This lowering of the riverbed threatens vegetation and river wildlife.