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top: a river at normal level
bottom: a river that has flooded and spread to low-lying areas on either side of the river
flood·plainalso flood plain (flŭd′plān′)
A plain bordering a river and subject to flooding at times of high water.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Physical Geography) the flat area bordering a river, composed of sediment deposited during flooding
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
Flat land bordering a river and made up of sediments such as sand, silt, and clay deposited during floods.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||floodplain - a low plain adjacent to a river that is formed chiefly of river sediment and is subject to flooding|
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