45902160. 'Huge' water resource exists under Africa. 20 April 2012Last updated at 10:48 GMT By Matt McGrath Science reporter, BBC World Service Scientists say the notoriously dry continent of Africa is sitting on a vast reservoir of groundwater.
They argue that the total volume of water in aquifers underground is 100 times the amount found on the surface. How can water be fairly distributed? By the time you read this you will have inevitably used water directly and indirectly since the start of the day.
The chances are you have no idea how much you have used. But without it, many activities would have been impossible - from obvious processes such as drinking to washing - to having food to eat, using energy and enjoying any number of manufactured goods. But as competing demands for water intensify, how can we ensure that water is fairly and affordably distributed?