The Nile did something amazing every year: it rose, spilled over its banks and covered the fields with water. Egyptians did not fear this flood. They waited for it and hoped it would be just right.
Key idea
Every summer the Nile rose and flooded the valley. When the water went down, it left a layer of rich, dark mud (silt) that made the fields fertile for the next crop.
Why it works
The flood began far away. Each summer, heavy rains fell on the mountains of Ethiopia, far to the south. That water rushed down into the Nile, which swelled and flowed north into Egypt. The muddy water carried soil from those mountains and left it on Egypt's fields, like a fresh layer of plant food every year.
Worked example: A low flood
One year the Nile rises only a little. What happens to the farms?
- The water does not reach many fields.
- Those fields get no new mud and stay dry.
- Fewer crops grow, so there is less food.
Answer: A poor harvest, and people may go hungry.
Worked example: A huge flood
Another year the Nile rises much higher than usual. Is that good news?
- A little extra water is fine.
- But a very high flood can wash away houses and canals.
Answer: No: too much water can be as bad as too little.
Common mistake
Thinking the flood was a disaster. For Egyptians it was the most important event of the year: a good flood meant a good harvest. They even measured it with marked steps called nilometers. The flood god Hapi was pictured as a plump, well-fed man.
Today the Aswan High Dam, finished in 1970, holds the water back, so the Nile no longer floods each year.