noun
amount of water; volume of water
Refers to the quantity or volume of water in a river, dam, tank, rainfall context, plumbing context, and similar settings.
今年は雨が少なく、川の水量が減っている。
There has been little rain this year, and the amount of water in the river is decreasing.
ダムの水量を毎日測定
They measure the volume of water in the dam every day.