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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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What are some problems with the dams?

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


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