Question

List 2 problem in building dam

Answer 1

SOCIAL PROBLEM : THE CONSTRUCTION OF DAMS DISPLACE THE LOCAL COMMUNITIES LIVING IN THAT AREA.

ENVIRONMENTAL PROBLEMS : THE CONSTRUCTION OF DAMS RESULTS IN DEFORESTATION WHICH CAUSES THE DESTRUCTION OF THE ECOSYSTEM

Answer 2

-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.

-Nasa geophysicist Dr. Benjamin Fong Chao found evidence that large dams cause changes to the earth's rotation, because of the shift of water weight from oceans to reservoirs. Because of the number of dams which have been built, the Earth's daily rotation has apparently sped up by eight-millionths of a second since the 1950s. Chao said it is the first time human activity has been shown to have a measurable effect on the Earth's motion.