What does "head gate" mean?

a gate upstream from a lock or canal that is used to control the flow of water at the upper end

What is a synonym for "head gate"?

Common synonyms include: air lock, floodgate, gate, lock, penstock, sluice.

Rare ·Advanced level

Noun

1
a gate upstream from a lock or canal that is used to control the flow of water at the upper end wordnet
2
regulator consisting of a valve or gate that controls the rate of water flow through a sluice wordnet