下げ水すい

noun

drainage; sewer system; ditch; gutter

Refers to the infrastructure for carrying away wastewater and rainwater, including pipes, ditches, and gutters.

• この地ち域いきの下げ水すいは古ふるくて、大おお雨あめのたびに溢あふれる。

  The drainage in this area is old and overflows every time it rains heavily.

• 道どう路ろの下げ水すいが詰つまっている。

  The gutter on the road is clogged.

noun

sewage; black water

Refers to the wastewater itself, especially from toilets and kitchens. Often used in contexts like treatment, discharge, or pollution.

• 工こう場じょうから出でる下げ水すいは厳きびしく管かん理りされている。

  Sewage discharged from factories is strictly controlled.

• 下げ水すいを浄じょう化かして川かわに戻もどす。

  We purify the sewage and return it to the river.