余よ水すい路ろ

noun

spillway

A channel or passage for surplus water to escape from a dam, reservoir, or canal.

• 大おお雨あめでダムの水すい位いが上あがり、余よ水すい路ろから水みずが流ながれ出でた。

  Heavy rain raised the dam's water level, and water flowed out through the spillway.