A flood happens when water covers land that is usually dry. A river floods when it rises above its banks and spreads over the flat land on either side of it. That flat land, which the river covers from time to time, is its floodplain.
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Earth and Space Sciences · 术语表
又称: flood · floodplain
A flood happens when water covers land that is usually dry. A river floods when it rises above its banks and spreads over the flat land on either side of it. That flat land, which the river covers from time to time, is its floodplain.