A simple and cost-effective water solution is helping drought-prone regions in South Africa restore their groundwater supplies, offering hope for communities facing growing climate stress.
Researchers from the University of the Free State have successfully implemented small-scale managed aquifer recharge (MAR) systems across five towns, demonstrating how excess rainwater can be stored underground for long-term use.
South Africa is among the driest countries globally, with over 400 towns relying heavily on groundwater. In recent years, severe droughts have pushed some areas, including Sutherland, to “Day Zero” — when water supplies effectively run out. Traditional solutions like water-shedding have only provided temporary relief, especially as rainfall patterns become more unpredictable due to climate change.
The researchers turned to managed aquifer recharge, a method that channels surplus rainwater into the ground through structures such as ponds, boreholes, check dams and gabions. This allows water to slowly seep into aquifers, replenishing underground reserves that act like natural storage systems.
The results have been significant. In towns like Carnarvon and Williston, groundwater levels rose dramatically after rainfall events, in some cases sustaining water supply for up to two years. In Sutherland, where a recharge system was installed after the town ran out of water in 2021, aquifer levels increased by 10 metres within a year following good rains.
Other towns such as Vanwyksvlei and Calvinia also saw substantial improvements after installing infiltration boreholes and flow-control structures. These systems helped capture rainwater that would otherwise be lost as runoff, allowing it to penetrate deep into the ground.
Beyond improving water availability, the projects also delivered environmental benefits. Increased vegetation around recharge sites helped stabilise soil and further enhance water infiltration, creating a positive feedback loop for groundwater recovery.
Importantly, the study highlights that such solutions do not require massive investment. Costs can range from relatively low for a single borehole to moderate for a full recharge system, making it a practical option for small and rural communities.
The researchers emphasise that building these systems during drought periods ensures they are ready to capture water when rains return. They also recommend including small-scale aquifer recharge in national water policies to strengthen long-term water security.
As climate change continues to disrupt rainfall patterns, this approach offers a sustainable and scalable way to “bank” water underground, helping vulnerable regions adapt to an increasingly uncertain future.