What did farmers in mesopotamia do to control water problems and ensure that they could grow plenty of food

The answer to your question is that Over time, the farmers learned to build dams and channels to control the seasonal floods. They also built walls waterways, and ditches to bring water to their Field's. The farmers learned a certain way to water their crops, this way of watering crops is called irrigation. Irrigation allowed the farmers to grow plenty of food and support a large population. The dams are actually called a levee