Heavy rain, a broken dam or levee, rapid icemelt in the mountains, or even a beaver dam in a vulnerable spot can overwhelm a river and send it spreading over nearby land. The most common is when rivers or streams overflow their banks. Sometimes, floods develop quickly and with little warning.Ī flood can develop in a many ways. Generally, floods take hours or even days to develop, giving residents time to prepare or evacuate. There are few places on Earth where people don’t need to be concerned about flooding. A flood happens when water overflows or soaks land that is normally dry.
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