Final answer:
The ancient Egyptians built dams and channels to control flooding from the Nile and facilitate sailing on the river.
Step-by-step explanation:
The ancient Egyptians built dams and channels for several reasons. One of the main reasons was to better control flooding from the Nile. The Nile River would often flood, and the Egyptians built structures to redirect the water and prevent it from damaging their settlements and crops. The dams and channels also facilitated irrigation so that the Egyptians could water their fields and ensure a stable food supply. Additionally, the construction of dams and channels made it easier to sail up the Nile as the water flow was regulated, allowing boats to navigate more smoothly.
Learn more about the importance of water control in ancient Egypt