Advantages and disadvantages of dams?

1. Disadvantages

Once a dam is built, it will destroy the distribution of water resources. In the Bolange district of West Orissa, India, there used to be dozens of ponds in many villages. However, after the dam was built, 8% of the ponds disappeared, which affected the reduction of grain production 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 dam is built, it will change the rainfall pattern: The Hilakud dam reservoir has changed the local rainfall pattern, 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 rain on the other side. 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.

2. Benefits

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

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