EcoNile — The Nile and Its Water | econile.org
Why the world's longest river can still leave communities short: physical scarcity in arid North Africa and economic scarcity across sub-Saharan Africa.
Water scarcity comes in two types, and the Nile basin experiences both. Physical scarcity means there is not enough water to meet all demands; economic scarcity means that infrastructure or investment is lacking, so water that exists in the river cannot reach the people who need it. The distinction matters because the two types call for different responses.
North Africa is among the arid regions facing physical water scarcity. In these areas the total volume of water available is insufficient to meet all demands, regardless of how the delivery system is organized. The Nile flows through this zone on its way to the Mediterranean, but the river's presence does not eliminate physical scarcity in the surrounding arid landscape.
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Many people in sub-Saharan Africa live with economic water scarcity. Here the issue is not the absence of water in the river but the absence of infrastructure or investment to deliver it. A community near the Nile can still lack access if the means to treat, store, and distribute water are not in place.
The quantitative scale of the problem is widely cited: about 2.3 billion people live in nations with water scarcity, defined as less than 1,700 cubic meters of water per person per year. Regions projected to have less than 1,000 cubic meters of water per capita per year face the severest scarcity.
The paradox of a long river running short is thus explained by two mechanisms operating in different parts of the basin. Physical scarcity dominates in the arid north; economic scarcity dominates in the sub-Saharan south. The river is 7,088 kilometres long, but length alone does not determine whether water reaches the people living along it.
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