
1) Dam 2) Penstock 3) Sluice 4) Sluicegate
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https://www.crosswordclues.com/clue/floodgate

1) Restraint 2) Sluice 3) William Collins, Sons book
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https://www.crosswordclues.com/clue/floodgate

Floodgates, also called stop gates, are adjustable gates used to control water flow in flood barriers, reservoir, river, stream, or levee systems. They may be designed to set spillway crest heights in dams, to adjust flow rates in sluices and canals, or they may be designed to stop water flow entirely as part of a levee or storm surge system. Sinc...
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http://en.wikipedia.org/wiki/Floodgate

Gate placed across/along a channel to control floodwater or a gate across a roadway in levee.
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http://www.americantrails.org/

gate for shutting out or releasing the flow of water over spillways, in connection with the operation of a dam. Vertical lift, or radial, gates rise ... [2 related articles]
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http://www.britannica.com/eb/a-z/f/38
noun something that restrains a flood or outpouring; `suspension of surveillance opened the floodgates to illegal immigrants`
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https://www.encyclo.co.uk/local/20974

a gate designed to regulate the flow of water. · anything serving to control the indiscriminate flow or passage of something.
Found on
https://www.infoplease.com/dictionary/floodgate
No exact match found.