Why was learning to predict the annual floods of the Nile river important to the Egyptians

It was important, because many fields were on the flood plains of the Nile. It was also important because the flooding of the Nile brought mineral and nutrient rich soil, which made the farming land more fertile. Without the knowledge of the flooding of the Nile, Egyptian agriculture might have been destroyed. It is still important to farmers along the edge of the Nile to this day.