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I don't think there is any possible way of having an accurate estimate. Floods are happening all the time, from time to time, all over the earth. Some are small, some are catastrophic. Since people have arrived on the scene, there have been many thousands of floods-- perhaps hundreds of thousands.

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14y ago
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8y ago

It varies based on where you are. Sometimes it takes very little when there is poor drainage.

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13y ago

5 inches or more

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Q: How much rain is needed for a flood?
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