Midwest flooding

Lots of rain in a short time…..

Oddly, low lying areas flooded when Mother Nature dumps large amounts of rain in a very short time.

I would bet good money that the areas that have flooded in Oklahoma and other places have flooded before. Maybe not every year, nor every 10 years, but it has happened at that spot before.
But people build there, and are then surprised when their houses flood when the area gets torrential rain.