Water under Africa: more than we realized!

Thanks to Donn Gaede for forwarding this to me.


"New maps indicate that many countries currently designated as "water scarce" have substantial groundwater reserves."
Here is the BBC article: 
Water under africa???

Here is the article pdf:
doi:10.1088/1748-9326/7/2/024009

Its not available for everyone and much of it is not extractable.  

The good news is: "ground water is indicated to have a residence time in the ground of 20 to 70 years."