Groundwater resource mapping

So following from last weeks post, that suggests there is currently not enough quantification of groundwater resources in Africa, scientists from the British Geological Survey and UCL ( yes, my university is famous) have actually mapped the potential yield of aquifers underlying the African continent.
http://www.bbc.co.uk/news/science-environment-17775211

This research suggests that the current water resources under ground are 100 times that of on the service.

This is great news, now that we know water is there to actually feed the population and help the people as well as provide a buffer to climate change. However how do we actually realize these reserves? We must develop an understanding of the best ways to extract them and transport it to the needed areas.