The flooding of the Nile was important for the ancient Egyptians because…

This is because the names come from the flow of the Nile River. The most important thing the Nile provided to the Ancient Egyptians was fertile land. Most of Egypt is desert, but along the Nile River the soil is rich and good for growing crops.

Explanation:

it was important because without it ancient Egypt could not have existed the floods provided the only source of moisture to sustain crops for farming

i think the reason that they immagrated was to find freedom of religion