Namibia
Water sources

Namibia is the driest country in sub-Saharan Africa and depends largely on groundwater. With an average rainfall of about 350 mm (14 in) per annum, the highest rainfall occurs in the Caprivi Strip in the northeast (about 600 mm (24 in) per annum) and decreases in a westerly and southwesterly direction to as little as 50 mm (2 in) and less per annum at the coast. The only perennial rivers are found on the national borders with South Africa, Angola, Zambia, and the short border with Botswana in the Caprivi Strip. In the interior of the country, surface water is available only in the summer months when rivers are in flood after exceptional rainfalls. Otherwise, surface water is restricted to a few large storage dams retaining and damming up these seasonal floods and their run-off. Where people do not live near perennial rivers or make use of the storage dams, they are dependent on groundwater. Even isolated communities and those economic activities located far from good surface water sources, such as mining, agriculture, and tourism, can be supplied from groundwater over nearly 80% of the country.

More than 100,000 boreholes have been drilled in Namibia over the past century. One third of these boreholes have been drilled dry. An aquifer called Ohangwena II, on both sides of the Angola-Namibia border, was discovered in 2012. It has been estimated to be capable of supplying a population of 800,000 people in the North for 400 years, at the current (2018) rate of consumption. Experts estimate that Namibia has 7,720 km (1,850 cu mi) of underground water.

According to African Folder, a sewage-to-water treatment project in Namibia not only provides citizens with safe drinking water, but also boosts productivity by 6% per year. All pollutants and impurities are removed using cutting-edge "multi-barrier" technology, which includes residual chlorination, ozone treatment, and ultra membrane filtration. Strict bio-monitoring methods are also used throughout the process to ensure high-quality, safe drinking water.

On June 8, 2023, Namibia became the first Southern African country and the eighth country in Africa to accede to the Convention on the Protection and Use of Transboundary Watercourses and International Lakes (UN Water Convention).
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