What special conditions for the development of agriculture existed in ancient Egypt?

In ancient Egypt, the development of agriculture was influenced by the floods of the Nile, which were predictable, since they differed in seasonality. Also in the valley, the soil was fertile, which made it possible to achieve a good harvest and develop a large-scale economy. The spill took place in August and September, so in October the soil was fertile, where plants could be sown. Canals for irrigation were also built so as not to be left without crops in drought.