分ぶん水すい路ろ

noun

diversion channel; flood-control channel

A water channel built to divert part of a river's flow, typically for flood control or irrigation. Used in civil engineering and disaster prevention contexts.

• この分ぶん水すい路ろは大おお雨あめのときに川かわの水みずを海うみへ流ながす。

  This diversion channel carries river water to the sea during heavy rain.