London: The notoriously dry continent of Africa is sitting on a vast reservoir of groundwater, say scientists.
Researchers from the British Geological Survey and University College London (UCL) have mapped in detail the amount and potential yield of this groundwater resource across the continent.
They argue that the total volume of water in aquifers underground is 100 times the amount found on the surface.
Freshwater rivers and lakes are subject to seasonal floods and droughts that can limit their availability for people and for agriculture. At present only 5 percent of arable land is irrigated.
When water falls as rain or snow, much of it either flows into rivers or is used to provide moisture to plants and crops. What is left over trickles down to the layers of rock that sit beneath the soil.
And just like a giant sponge, this ground water is held in the spaces between the rocks and in the tiny inter-connected spaces between individual grains in a rock like sandstone.
These bodies of wet rock are referred to as aquifers. Ground water does not sit still in the aquifer but is pushed and pulled by gravity and the weight of water above it.
The movement of the water through the aquifer removes many impurities and it is often cleaner than water on the surface.
Now scientists have for the first time been able to carry out a continent-wide analysis of the water that is hidden under the surface in aquifers.
Helen Bonsor from the BGS is one of the authors of the paper. She says that up until now groundwater was out of sight and out of mind. She hopes the new maps will open people’s eyes to the potential.
“Where there’s greatest ground water storage is in northern Africa, in the large sedimentary basins, in Libya, Algeria and Chad,” she said.
“The amount of storage in those basins is equivalent to 75m thickness of water across that area – it’s a huge amount,” she added.
Due to changes in climate that have turned the Sahara into a desert over centuries many of the aquifers underneath were last filled with water over 5,000 years ago.
The scientists collated their information from existing hydro-geological maps from national governments as well as 283 aquifer studies.
The researchers say their new maps indicate that many countries currently designated as “water scarce” have substantial groundwater reserves.
However, the scientists are cautious about the best way of accessing these hidden resources. They suggest that widespread drilling of large boreholes might not work.
“High-yielding boreholes should not be developed without a thorough understanding of the local groundwater conditions,” Dr Alan MacDonald of the BGS, lead author of the study, told the BBC.
“Appropriately sited and developed boreholes for low yielding rural water supply and hand pumps are likely to be successful,” Dr MacDonald noted.
With many aquifers not being filled due to a lack of rain, the scientists are worried that large-scale borehole developments could rapidly deplete the resource.
According to Bonsor, sometimes the slower means of extraction can be more efficient.
“Much lower storage aquifers are present across much of sub-Saharan Africa,” she explained.
“However, our work shows that with careful exploring and construction, there is sufficient groundwater under Africa to support low yielding water supplies for drinking and community irrigation,” she added.
The scientists say that there are sufficient reserves to be able to cope with the vagaries of climate change.
“Even in the lowest storage aquifers in semi arid areas with currently very little rainfall, ground water is indicated to have a residence time in the ground of 20 to 70 years.” Dr Bonsor said.
“So at present extraction rates for drinking and small scale irrigation for agriculture groundwater will provide and will continue to provide a buffer to climate variability,” she added.
The finding has been reported in the journal Environmental Research Letters.