Fix the foundation if that does not wrk find a material too help stabilize the soil hope this helps
It is called a flood plain because it is a big wide space in which allows the water to flow currently.
Why might a post classical civilization want to conquer Egypt and the Nile River Valley? It's fertile land provided the foundation for the first human civilizations and its access to the Persian Gulf and location between Europe, Asia, and Africa made it a center of trade.