放ほう水すい路ろ

noun

flood bypass; floodway; discharge channel; diversion channel

Civil engineering term for a channel or waterway built to divert excess water, especially during floods.

• 大おお雨あめのとき、放ほう水すい路ろがなければ町まちは水みず浸びたしになる。

  During heavy rain, the town would be flooded without the diversion channel.

• この放ほう水すい路ろは川かわの氾はん濫らんを防ふせぐために作つくられた。

  This floodway was built to prevent the river from overflowing.