water intake; intake port; sluice gate
Refers to the opening or structure where water is drawn from a river, reservoir, or other source, often for irrigation, water supply, or power generation.
Water flows in from the dam's intake port.
We regularly clean the water intake to prevent debris from clogging it.
放水口 is a discharge outlet, often for releasing water from a dam or system, whereas 取水口 is the intake side.
Compound of 取水 (shusui, 'water intake') + 口 (kō, 'opening, mouth'). The exact historical derivation is uncertain, but the kanji directly reflect the meaning.