Dreaming of floods:

Dreaming of a rare flood means that the enemy will counterattack, reminding the dreamer to prevent it before it happens.
An unmarried girl dreams of a flood, which means that the dreamer's parents will agree to marry her sweetheart.
Dreaming that you were rescued when you were about to be drowned in water means that the dreamer will alleviate the disaster to varying degrees with the help of others.