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1. A control gate upstream of a lock or canal.
2. A floodgate that controls the flow of water in a ditch, sluice, race, or channel.
1. a control gate at the upstream end of a canal or lock.
2. a floodgate of a race, sluice, etc.
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|Noun||1.||head gate - regulator consisting of a valve or gate that controls the rate of water flow through a sluice|
regulator - any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.
|2.||head gate - a gate upstream from a lock or canal that is used to control the flow of water at the upper end|
gate - a movable barrier in a fence or wall