![]() ![]() All 50 states of the United States are vulnerable to flooding. Floods are the second-most widespread natural disaster on Earth, after wildfires. Coastal flooding, also called estuarine flooding, happens when a large storm or tsunami causes the sea to rush inland. ![]() The land surrounding a river is called a flood plain. 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. ![]() 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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