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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]
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]
Compared to other major rivers, though, the Nile carries little water (5% of that of the Congo River, for example). [27] The Nile basin is complex, and because of this, the discharge at any given point along the main stem depends on many factors including weather, diversions, evaporation and evapotranspiration, and groundwater flow.
This article lists rivers by their average discharge measured in descending order of their water flow rate. Here, only those rivers whose discharge is more than 2,000 m 3 /s (71,000 cu ft/s) are shown. It can be thought of as a list of the biggest rivers on Earth, measured by a specific metric.
The 1959 Nile waters treaty between Egypt and Sudan allocates 55.5 billion cubic meter of water per year to Egypt, without specifying any allocation for upstream riparians besides Sudan (18.5 billion cubic meters per year). Actual water use by Egypt is widely believed to be in excess of the allocation under the 1959 agreement.
However, they were still not able to retain sufficient water to cope with the driest summers, despite the Aswan Low Dam being raised twice, in 1907–1912 and in 1929–1933. During the 1920s, the Sennar Dam was constructed on the Blue Nile as a reservoir in order to supply water to the huge Gezira Scheme on a regular basis. It was the first ...
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