floodgate

English Thesaurus

1. 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)

2. something that restrains a flood or outpouring (noun.cognition)

hypernym	:	restraint,
definition	:	a rule or condition that limits freedom (noun.cognition)