The Nilometer located in El-Malek El-Saleh street, Al Manial, Cairo Governorate.
The structure is modern but the Nilometer dates from 861 AD. The Nilometer was built by the islamic scientist Ahmed Forghani , who is from the city of Fergana, Uzbekistan.
A Nilometer was a structure for measuring the Nile River's clarity and water level during the annual flood season. It was a step-like structure that measured how high the flood would be. There was a specific mark that indicated how high the flood should be if the fields were to get good soil.
The simplest nilometer design is a vertical column submerged in the waters of the river, with marked intervals indicating the depth of the water.

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