flood·way

[fluhd-wey]
noun
the channel and adjacent shore areas under water during a flood, especially as determined for a flood of a given height.

Origin:
1885–90; flood + way

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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American Heritage
Science Dictionary
floodway   (flŭd'wā')  Pronunciation Key 
A channel for an overflow of water caused by flooding.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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00:10
Floodway is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Example sentences
The floodplain consists of two areas: the floodway and the floodway fringe.
Permissible uses within flood plain but outside floodway.
Fill is prohibited within the floodway unless it has been demonstrated that it
  will not result in any increase in flood levels.
The red dots are brown stakes that mark the boundaries in the floodway.
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