20 July 2012 Updated at 05:15 ET
Vast aquifer found in Namibia could last for centuries
Matt McGrath
Science reporter,
BBC World Service
Pressure from the aquifer means the water is cheap to extract
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A newly discovered water source in Namibia could have a major impact on development in the driest country in sub-Saharan Africa.
link-
http://www.bbc.co.uk/news/science-environment-18875385