African leaders have joined a worldwide thrust for a “green recovery” from the Covid-19 setback and the climate crisis.
According to Bradley Hiller,a former AsiaGlobal Fellow, Asia Global Institute at the University of Hong Kong, research suggests that such green recovery strategies – especially in agriculture and food security – could draw on a relatively under-developed resource: groundwater.
“Groundwater is water under the surface of the ground, typically accessible via wells and boreholes. It’s not visible like a great river. This can be beneficial because groundwater is less exposed to evaporation and surface pollution,” he said.
“Groundwater has supported impressive spurts of development in some parts of the world. California’s irrigation and industrial boom, India’s green revolution, and China’s national grain production increase are examples.”
According to Hiller, in sub-Saharan Africa, groundwater doesn’t get such attention. Rather, regional water resource management focuses on surface water development.
The Nile Basin Initiative and the Zambezi River Authority are two such examples. There aren’t any high-profile groundwater authorities.
“Knowledge about groundwater is scarce in some countries. Development tends to be informal and limited to shallow use. This contributes to the belief that groundwater resources in sub-Saharan Africa aren’t large enough, or conveniently located, to significantly contribute to socioeconomic development,” Hiller added.
“Combining data on the physical availability of groundwater with information on political-economy factors, our study revealed that groundwater is by far the largest regional water resource by volume. Annual renewable groundwater in the region is equivalent to 15 years of average total flow of the Nile River. We also found that renewable groundwater is often available where it’s most needed and at depths of less than 100 metres.”
He said his research had discovered that less than 5% of the region’s renewable groundwater is being used. Its potential for sustainable use is tremendous.
“Various studies also support our technical findings. A recent study found opportunities for sustainably withdrawing groundwater across much of the continent. In short, there’s an opportunity for a renewed regional focus on sustainable groundwater development.
Our findings suggest that groundwater could support critical sectors across the region.
For example, it could help increase sub-Saharan Africa’s current irrigated land area, which is currently 3%.
Groundwater could increase per capita water consumption, currently the lowest globally.
It could help cities guard against shocks such as the “Day Zero” water crisis in Cape Town, South Africa. And it could lessen the impacts of recurrent droughts.
Stronger regional water and food security could support poverty reduction, economic structuraal change and a transition to higher value-added activities. Ultimately, these could contribute to greater regional prosperity.
“Preliminary results from an economic simulation in Uganda, for example, found that doubling investment in sustainable groundwater development could increase agricultural GDP by 7%, create 600,000 jobs, and alleviate poverty for half a million people nationally by 2030.
“Understanding political economy factors in sub-Saharan Africa is vital to unlocking the potential benefits of groundwater development and managing trade-offs. Such factors include land rights and tenure, energy availability and price, access to credit, and the cost and availability of drilling equipment and pumps, amongst others.”
There are already examples of how innovation and leadership in the region can unlock this potential. A managed aquifer recharge scheme in Windhoek, Namibia – the driest capital in the region – is an engineering and financial success for city water supply. The scheme also preserves the fragile Okavango River.
The cost of technologies such as renewable energy and desalination is falling. They offer further possibilities, coupled with approaches such as farmer-led irrigation development and improved end-use efficiency measures.
According to Hiller, groundwater has the potential to support broad economic, humanitarian and social development in sub-Saharan Africa. It has done so in other regions globally. But resource development must be sustainably managed.
“There’s no denying the potential for pitfalls. For example, over-exploitation of groundwater in some parts of California has led to water stress and land subsidence. Consolidating such international lessons with recent regional experiences could inform sustainable groundwater governance in sub-Saharan Africa from the outset.
“The year 2022 presents promising opportunities. In February, addressing the African Union, the United Nations (UN) Secretary General António Guterres highlighted the importance of green recovery to ignite economic recovery.”
