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A nilometer is a structure for measuring the Nile River's clarity and water level during the annual flood season in Egypt. [1] There were three main types of nilometers, calibrated in Egyptian cubits: (1) a vertical column, (2) a corridor stairway of steps leading down to the Nile, and (3) a deep well with a culvert. [1]
Map of Nile tributaries in modern Sudan, showing the Yellow Nile The Nile represented in an ancient Roman mosaic found from the ruins of Pompeii. The Yellow Nile is a former tributary that connected the Ouaddaï highlands of eastern Chad to the Nile River Valley c. 8000 to c. 1000 BCE . [ 49 ]
The first indications of the rise of the river could be seen at the first of the cataracts of the Nile (at Aswan) as early as the beginning of June, and a steady increase went on until the middle of July, when the increase of water became very great. The Nile continued to rise until the beginning of September, when the level remained stationary ...
The Upper Nile plant is the Egyptian lotus, and the Lower Nile plant is the Papyrus Sedge (Cyperus papyrus), although it is not nearly as plentiful as it once was, and is becoming quite rare. [20] Several hundred thousand water birds spend their winter in the delta, including the world's largest concentrations of little gulls and whiskered terns.
The Nile runs through Sudan, South Sudan, Burundi, Rwanda, Democratic Republic of the Congo, Tanzania, Kenya, Uganda, Ethiopia, and Egypt and is considered to be the longest river in the world. The Nile is the only significant source of water in North Africa and 40% of Africa’s population lives in the Nile River Basin. [3]
The main water supplier for the basin is Lake Victoria, located in the Great Rift Valley. [4] About 238 million people live within the Nile basin, 172 million of those inhabit rural localities. [5] In the southwestern part of the basin in South Sudan near the watershed with Congo Basin relief is made up a single large pediplain. [6]
It was designed with a maximum water level of 183 metres (600 ft) above sea level. As a precaution against any unexpected rise in Lake Nasser's water level, a spillway and channel were built in 1978. The channel has the potential to divert water from the reservoir to the Toshka basin, which is located outside the Nile basin.
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