noun
Refers to damage or disaster caused by water, especially flooding. Often used in formal or news contexts. Compare with 水害 (すいがい), which is more common for flood damage.
See also: 水害
台風による水災で多くの家が浸水した。
Many houses were flooded due to water damage from the typhoon.
水災に備えて保険に入る。
I take out insurance in preparation for water disasters.