Researchers at the Leibniz Centre for Agricultural Landscape Research have demonstrated a method to boost groundwater reserves by diverting stream water into natural depressions during wet periods. Using the lower Spree catchment in Brandenburg as a test site, the team modeled how small landscape basins could absorb runoff and allow it to percolate into the aquifer.
The approach tackles seasonal water imbalances head-on, capturing surplus flows that might otherwise cause flooding. This stored water then slowly recharges both groundwater and the connected surface water system, addressing a growing concern as droughts become more frequent in temperate regions.
In the simulations, groundwater levels rose locally by up to 2 meters (6.6 feet). Meanwhile, water flow in connected streams increased by as much as 15%, according to the study published in the Journal of Hydrology: Regional Studies.
While promising, the technique requires careful site selection and may not scale to all landscapes. Implementation would also need coordination with land managers and water authorities to avoid unintended effects on existing ecosystems or agriculture.
The researchers suggest their model could be adapted to other regions facing similar hydrological challenges.