penstock

Mane (Îngilîzî)

1. A sluice or pipe which allows the controlled flow of water from behind a dam, typically routing it to a turbine of a power plant.
2. The barrel of a wooden pump.

Hevwate

sluice

head gate

floodgate

water gate

sluicegate

sluiceway

sluice valve

plug

race

raceway

runway

slide

bay

spout

trough

waterspout

weir

headrace

lock-gate

tail gate

slideway

boards

cavetto

coulisse

flume

groove

hydrant

Werger

cataratta

chiusa

cateratta

écluse

vanne

chiavica

paratoia

canale di chiusa

canal

duto

ducto

Descarregador de cheia

canal

canal

tubería forzada

Etîmolojî (Îngilîzî)

Perhaps from pen (“an enclosure”) + stock.