伏ふく流りゅう水すい

noun

underground water; subterranean stream

Refers to water flowing beneath the surface, often in the context of geology, civil engineering, or environmental studies. Not a general term for groundwater; specifically implies a flowing body of water underground.

• この地ち域いきでは伏ふく流りゅう水すいが豊ほう富ふで、井い戸どを掘ほるとすぐに水みずが出でる。

  In this area, underground water is abundant, and water comes out quickly when you dig a well.

• トンネル工こう事じ中ちゅうに伏ふく流りゅう水すいが湧わき出だして、作さ業ぎょうが一いち時じ中ちゅう断だんされた。

  During tunnel construction, an underground stream gushed out, temporarily halting the work.