The Nile river would have an annual from June to September and the flood would start to decrease in October. The Niles annual flood was really important to the Egyptians for many reasons such as, it would make the soil fertile and good to grow crops in. It would also wash up silt which is a soft rock that is used to make tools.
One characteristic of the fertile crescent that encouraged the development of agriculture is the fertile soil which allowed croups to grow and flourish