Advantages and disadvantages of dams?

Once the dam is built, it will destroy the distribution of water resources. In Bolange District, West Orissa, India, there used to be dozens of ponds in many villages. However, after the completion of the dam, 80% of the ponds disappeared, which affected the grain yield reduction in this area. Only those villages that have preserved traditional water storage methods and protected forests have withstood the test of successive years of disasters.

After the completion of the dam, it will also change the rainfall pattern: the local rainfall pattern has been changed by the Xilakudam reservoir, so it is considered that the drought is caused by the reservoir, because there is too much rainfall on one side of the reservoir, but there is no rainfall on the other. So the reservoir has brought prosperity to one area, but poverty to another; It adds green to one area, but deprives another area of vitality.

Second, interests.

1. First of all, the dam can provide electricity, and the estimated power generation of the Three Gorges Reservoir in China is equivalent to that of 18 nuclear power plants; In Norway, more than 98% of energy comes from hydropower, which has benefited Norwegians for a long time.

Dams can also provide convenience for irrigation, drinking water, flood control and navigation. The development of human civilization plays a great role.