A flood is an overflowing of a large amount of water beyond its normal, confines (confines means keep or restrict someone or something within certain limits) especially over what is normally dry land.
How Do Floods Form?
Floods form from when there's a lot of rain in one place. It is usually very humid when a tornado is going to hit. The cloud type is cumunumbis clouds.
The Chinese Yellow River Flood 1887
The chinese yellow river flood killed about 4.0 million people. No records found of damage costs.
Hurricane Katrina Flood
It costed $100 billion in damage. The flood killed nearly 2,000 people.