1. 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].