head gate, n.
a gate upstream from a lock or canal that is used to control the flow of water at the upper end
<noun.artifact>
head gate
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head gate
semantic pointers
hypernym
regulator consisting of a valve or gate that controls the rate of water flow through a sluice
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floodgate head gate penstock sluice valve sluicegate water gate
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floodgate head gate penstock sluice valve sluicegate water gate