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Dams cause floods if they break. One purpose for a dam is create a lake behind it, so if it breaks or even leaks badly, the water behind the dam flows out faster than the stream bed below the dam can handle, The water overflows the banks of the stream and a flood occurs.

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Q: Why do dams sometimes cause floods?
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Related questions

What are some problems with the dams?

Sometimes dams slow the water down, and makes the water build up, causing floods.


Do dams stop floods?

The answer is yes


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They cut down trees and they build dams..... When they bulild those they stop waterways and they cause floods. Floods cause messy areas, messy areas make unhappy people, unhappy people cause DEATH.


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When trees are planted and when dams are created then it is possible for the floods to stop


What were the responses to the somerset floods?

Building of the dams and dykes are some of the responses of the Somerset floods.


Is earthquake a cause of building dams?

No, in fact, dams would collapse or crack in an event of an earthquake. Dams are built more to control floods, especially if they occur frequently and do destructive damage, just like why the Three Gorges Dam was built.


Why should humans not control floods?

Because sometimes when humans control floods they can cause damage to nearby areas.


What causes floods in Romania?

Deforestation is the principal cause. Also a very strange and imprevisible climate. Unfortunately all the rivers can cause floods sometimes after rains or melting of the snow.


What are two ways floods can be controlled?

building dams and drainage channels


What is bad about the 3 Gorges Dams?

Most likely , Ehh , floods. (:


How does hydro electricity impact on the environment?

Hydro-electricity floods valleys and sometimes good arable land. The dams cause problems for fish migration. On the positive side, the electricity generated is clean and emission free, so there are fewer greenhouse gases in the atmosphere.