The Cairo nilometer was used by the ancient Egyptians to measure the height of the Nile. It is located on the bank of the Nile river on the bottom of Roda Island in downtown Cairo. There is a 30 foot high stone post in the centre that measures the height of the water. When the Nile flooded each year, people opened the sluice gates and water poured in. When the water got to the level of the Nile, it would stop. This told the Egyptians how high the Nile was. The level of the water told whether it was going to be a good growing season or a bad one. If the water was high, this meant a good growing season. If the water was low, this meant a bad growing season. In a good growing season, the taxes would be high because the farmers would grow more crops and have more food. In a bad growing season, the people could not feed themselves and people would die. What I thought was most interesting about the Cairo nilometer was its depth and the stained glass on the ceiling.
My dad created a video while we were inside the nilometer, but we cannot upload it now because the wifi is not good.