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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 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]
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]
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.
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 Blue Nile [note 1] is a river originating at Lake Tana in Ethiopia.It travels for approximately 1,450 km (900 mi) through Ethiopia and Sudan.Along with the White Nile, it is one of the two major tributaries of the Nile and supplies about 85.6% of the water to the Nile during the rainy season.
The White Nile (Arabic: النيل الأبيض an-nīl al-'abyaḍ) is a river in Africa, the minor of the two main tributaries of the Nile, the larger being the Blue Nile. [4] The name "White" comes from the clay sediment carried in the water that changes the water to a pale color.