Nilometer

The Nilometer is an ancient instrument used to measure the waters of the Nile River. It is a structure that consists of a vertical column submerged in the waters of the river, with marked intervals indicating the depth of the water. The Nilometer on Rhoda Island in Cairo is a well-preserved example of this type of structure and dates back to 861 AD. It was used to predict the behavior of the Nile and determine the level of taxes to be paid. The Nilometer is an important part of Egyptian history and was used by priests and rulers to monitor the Nile's water level and predict the future. The structure is ornately carved and has a stairway that spirals down to the bottom. There are also other types of Nilometers, including a corridor stairway of steps leading down to the Nile and a deep well with a culvert. The Nilometer played a significant role in ancient Egyptian civilization, as it helped to predict the annual flood and determine the fertility of the land