- a nearly flat plain along the course of a stream or river that is naturally subject to flooding.
Origin of flood plain
First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for flood plain
At Little Falls, Minn., flood-plain, deposits of sand and gravel are found to contain many artificial objects of quartz.The Myths of the North American Indians
She reports that they were obtained in the flood-plain banks of the streamsides, and preferred the pine belt.The Pocket Gophers (Genus Thomomys) of Utah, Vol. 1 No. 1
Stephen D. Durrant
The flood-plain of the Tigris and Euphrates, and a few of the river-valleys are highly productive.Commercial Geography
Jacques W. Redway
Along its flood-plain portion, a stream deposits more or less sediment on its flats.
Besides depositing on its flood-plain, a stream often deposits in its channel.
- the flat area bordering a river, composed of sediment deposited during flooding
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012