floodgate

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floodgate

a gate in a sluice that is used to control the flow of water
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

floodgate

[′fləd‚gāt]
(civil engineering)
A gate used to restrain a flow or, when opened, to allow a flood flow to pass.
The lower gate of a lock.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.