pros and cons of building a dam?

Answer 1

Pros:

Hydroelectric power, flood control purposes, provides reservoirs for water supply, provides recreation opportunities.

Cons:

Destroys land and environment that becomes flooded, blocks fish passage in streams and rivers, often requires relocating people and homes, stops downstream flows that support fish, wildlife and sometimes people and agricultural lands. Generally, it is harmful to the natural environment.

Dams are usually built to benefit a large population of people at the expense of the environment and a smaller, less influential population of people (look at what they did on the Yangtze River in China as an example).

Answer 2

It depends what is at stake: If life depends on building a dam, then yes go ahead. For instance a very remote place without power stations. But if people can get along without changes to the nature, do not build it. At present time there are not many "wild rivers" left in the world, with that characteristic natural life associated with them. And way too many dams, artificial lakes, parks, and highways.

Answer 3

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Pros: Hydroelectric dams require a large initial investment, but after it has built its operation is relatively cheap, since it just uses "water"; it also does not emit carbon dioxide, so it does not contribute to global warming (except for the point made in "cons"). Cons: It requires a relatively large initial investment; it may require flooding large areas of rain forest, or relocating people, animals and plants; (although relatively minor, it also causes some emissions of methane as the organic material in the flooded area decomposes;

Answer 4

It does depend on where you build it. You will have flooding on one side and erosion on the other side. Nature will always try and correct itself and if it can't then it will fight like hell until it wins. Look at New Orleans, and all over the world where man have claimed the land and nature took it back.

Answer 5

You forgot the most important "Con`.
Silt! ... Many dams will never really pay for themselves
before their reservoirs silt up rendering them useless.