head gate

a control gate at the upstream end of a canal or lock.
a floodgate of a race, sluice, etc.

1830–40, Americanism

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World English Dictionary
head gate
1.  Compare tail gate a gate that is used to control the flow of water at the upper end of a lock or conduit
2.  another name for floodgate

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The head gate is constructed of steel and is operated manually.
The head gate structures were placed at the diversion take-out on the edge of the stream bank.
The head gate is located on the south bank and nearly half of the river is funneled into it.
One such practice is to lock dairy cows in the head gate at the feeder for routine veterinary exams or other health inspections.
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