noun, noun or participle which takes 'suru', intransitive verb
overflowing; flood; inundation
Literal overflowing of water, such as rivers flooding or water spilling over. Used as both a noun and a suru-verb.
大雨で川が氾濫した。
The river overflowed due to heavy rain.
この地域
This area suffers from flood inundation every year.
noun, noun or participle which takes 'suru', intransitive verb
oversupply; plethora; flood (of undesirable things)
Figurative use: an excessive amount of something, usually undesirable, such as information, products, or people. Often used with 情報, 商品, or 人が.
インターネット上には誤った情報が氾濫している。
False information is flooding the internet.
市場に安物の商品が氾濫した。
Cheap goods flooded the market.