A flood is an overflow of water. Floods are very hard to deal with.

This is most commonly due to an overflowing river, a dam break, snowmelt, or heavy rainfall. Less commonly happening are tsunamis, storm surge.The most deadly flooding was in 1931 in China and killed between 20,00,000 and 40,00,000 people. The Kerala flood in India was another flood that has destroyed people's houses.