A flood is too much water in area. Like when a river, lake, or a streams overflow because it rains for days and days. This would be a flood below:

how does it form?

A flood forms when it rains really heavily in a short time period. That causes a flash flood or a flash flood warning. Melting ice and snow also causes this. Floods last long because the ground can't let the water soak in right away.

Historical examples:

The Great Mississippi Flood of 1927. This flood was the most destructive flood for a river. It was the most destructive river flood in the United States. It had an area of 27,000 square miles and a depth of 30 feet.

How humans have prepared for this:

Humans prepare for this by watching the weather forecasts, get a first aid kit, and knowing your insulation for your house.  

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