Flood Damage
Water Damage
noun
Water damage is so bad they call it water damage. Doesn't get any clearer than this.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
ビエトとダリンが、水害で飛んだデータをふく元しています。
Viet and Darin are recovering the data that was lost from the water damage.
その水害で、5,000びきの猫が家を失いました。
The flood left 5,000 cats homeless.
私は、水害の起きやすい島で育ちました。
I grew up on a flood-prone island.