In 1993, after a 100-yr catastrophic flood event in the Midwest

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30. Years of silt accumulation from regular flooding are what makes river valleys such good farmland.

People will always turn floodzones into farmland, because that's where the crops grow best.

And then the farmers need to live close to their crops.

And then the support infrastructure for farming will move into the area.

And then the employees of feed supply, storage and processing facilities, farm equipment maintenance/repair, etc. and their families will follow.

Before you know it, there's a large population residing on land whose original attractiveness was precisely the fact that it has flooded many times in the past.

As long as human beings have to grow their food, expect to see this process play out many, many times.