head gate

English Thesaurus

1. a gate upstream from a lock or canal that is used to control the flow of water at the upper end (noun.artifact)

hypernym	:	gate,
definition	:	a movable barrier in a fence or wall (noun.artifact)

2. regulator consisting of a valve or gate that controls the rate of water flow through a sluice (noun.artifact)

hypernym	:	regulator,
definition	:	any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc. (noun.artifact)

part meronym	:	penstock, sluice, sluiceway,
definition	:	conduit that carries a rapid flow of water controlled by a sluicegate (noun.artifact)