The amount of fresh as opposed to salt water available on the planet is amazing small. A growing population and ever increasing industrial demands have and will lead to very real tensions between nations. This is already happening in the Levant, with a bellicose Israel threatening neighbours upstream over their plans for water extraction. The same issues have arisen over plans to divert a stretch of the Nile.
So news of two huge aquifers being found in sub-Saharan Africa has to be good news.