noun
water storage capacity; volume of stored water
Refers to the amount of water held in a reservoir, tank, or similar facility. Often used in technical or news contexts.
ダムの貯水量が平年を下回っている。
The dam's water storage level is below the average year.
この貯水タンクの貯水量は500リットルです。
The storage capacity of this water tank is 500 liters.
水量 is a general term for water volume, whereas 貯水量 is specifically about stored water.
Compound of 貯水 (water storage) and 量 (amount, quantity).