roller gate

roller gate
noun
: a hollow drum placed horizontally at the crest of a dam and rolled up or down an inclined track by pinion and rack to regulate water elevation

* * *

(on certain dams) a cylindrical gate that rises and falls by rotating against inclined racks.

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roller gate,
a cylindrical gate at the top of a dam that regulates water level by rolling up or down an inclined track.

Useful english dictionary. 2012.

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