floodway
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flood·way
(flŭd′wā′)n.
A channel for an overflow of water caused by flooding.
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.
floodway
(ˈflʌdˌweɪ)n
(Environmental Science) the path along which floodwater travels
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
flood•way
(ˈflʌdˌweɪ)n.
a place to which floodwaters are diverted.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.