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View synonyms for flood plain

flood plain

or floodplain

noun

  1. a nearly flat plain along the course of a stream or river that is naturally subject to flooding.


flood plain

noun

  1. the flat area bordering a river, composed of sediment deposited during flooding


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Word History and Origins

Origin of flood plain1

First recorded in 1870–75
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Example Sentences

For example, surveys of the flood plains in the area indicate elevated levels of fluoride, cyanide, PCBs, and PAHs—suggesting these chemicals could stem from the Alcoa sites despite remediation efforts.

At Little Falls, Minn., flood-plain, deposits of sand and gravel are found to contain many artificial objects of quartz.

Those using the slough are almost certainly permanent inhabitants of the river flood plain.

In times of flood they are carried far away from the regular channel and spread over the wide flood-plain of the river.

The extension seaward of this flood plain forms the broad delta at the river's mouth.

Along its lower course “the flood plain is bordered by high bluffs of yellow sandstone.”

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