four arguments against building dams on rivers?

Question

So are you saying that dams have no significant reasons to be built anywhere...

so what you are saying is that dams do have a postive potential on this earth.

Answer 1

1) Effects the river's ecosystem
2) Can possibly cause a catastrophe is it ever fails
3) Effects the environment as a whole, toying with the amount of water that gets through
4) Effects the beauty of the landscape

Mind you, I don't necessarily agree with any of these, just the only things I could come up with.

Answer 2

1. They interfere with nature, for instance making it hard for salmon to swim upstream and spawn.

2. They deprive people downstream of control over their own part of the river. In fact dams have often been built primarily for the purpose of stealing the water supply.

3. They sometimes inundate valuable real estate. Sometimes it's private property, which must be taken by eminent domain. Sometimes it's areas of historical significance like the ancient archeological sites behind the Aswan Dam in Egypt.

4. This point might be related to 3, but I couldn't think of another one offhand so I made this two different points. Big dam projects often displace people who lived behind the dam. The best example is the Three Gorges Dam in China, which will require 1.3 MILLION PEOPLE to find new homes! I'm guessing most of these people will get no government assistance or anything like that.

Answer 3

the problem here is that as many argument against can be argued for.

Dams are not built just for the hell of it. There is some purpose.

In the old days no one thought about consequences - until they happened. Now it is a big deal and a lot more (thought, time, money, research, etc.) is put into the decision.

If u were faced with a dam vs no electricity, which would u chose?

If it meant a higher cost for that electricity to make it ecologically friendly, which would u chose?

It is all about choice and trade offs.

I am against one sided arguments.
Problem solving is much more productive and rewarding.

Answer 4

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Answer 5

1. messes with the ecosystem, disrupts aquatic life
2. can affect the temp of water which fish are very sensitive to
3. they arn't very pleasing to the eye or blending with nature
4. upstream flooding issues

I don't personally agree with these arguments and I'm even an earth scientist. I feel dams when built properly can have a very positive impact.

Answer 6

Sediment deprivation for down river areas...

Temperature and flow changes affecting ecosystems and biota

Impoundments flood prime ecossyem and farmed areas to create the lakes

Requires eminent domain process to take away land.

Answer 7

go to answers.com at search of site type effects of building dam on rivers ,you get links ,choose the ones which best explains your query. for types of dams and more details on the same type dams you get hints choose the appropriate one for detailed explanation.

Answer 8

1) destroys plantation, create environmental problems
2)cuts many trees
3)kills many marine animals
4)conflicts between states and communities