- water conservation
節水する save water; economize on (the use of) water
- この夏はずっと節水しなければならないだろう
- We will have to use water sparingly all through the summer.
- 市当局は市民に節水を呼び掛けた
- City officials called upon [on] the public to 「conserve water [cut back on their use of water].