In Brandenburg's drier landscape, researchers at the Leibniz Centre for Agricultural Landscape Research have found that something simple—small natural basins scattered across the terrain—could transform how the region manages water through boom and bust cycles. By directing excess stream water into these depressions during wet periods, the water seeps slowly into the ground, replenishing aquifers and sustaining flowing streams through the dry months ahead.
Brandenburg sits in one of Germany's driest regions, where prolonged droughts alternate with intense rainfall, making a steady water supply throughout the year increasingly difficult. The problem runs deeper than recent climate shifts: over generations, the landscape was engineered with ditches and drainage systems designed to move water off the land quickly—helpful for farming but problematic when dry years arrive. Now researchers are proposing a controlled reversal, using what they call managed aquifer recharge, or MAR, to turn the tide.
The team modeled this approach across a 4.5 square kilometer area in the Demnitzer Mühlenfließ catchment in the lower Spree, combining woodlands, arable fields, and grassland. Using 30 years of weather and landscape data spanning 1991 to 2020, they simulated what would happen if streams' excess water during wet periods were directed into suitable depressions instead of flowing away unused. The results were striking: in their calculations, groundwater levels rose locally by up to two meters, and water flow in connected streams increased by as much as 15 percent. The influence extended across remarkable distances—the effects on groundwater levels reached more than 900 meters away from infiltration points.
What makes this study distinctive is that researchers didn't simply measure whether water seeps into soil. They examined how that water subsequently moves through the aquifer and supports connected surface streams over time and distance. This interconnection matters profoundly: when groundwater levels drop, streams receive less water; when groundwater rises, those same streams are sustained during dry spells. The research, published in the Journal of Hydrology: Regional Studies, shows that small infiltration sites distributed across the landscape can work together as a system.
"Our results show that small natural basins in the landscape can help retain water in the region for longer. This is particularly important as dry years become more frequent," says Jan Stautzebach, lead author of the study. The approach works best when implemented decentralized—many smaller sites doing the work of retention rather than large installations with high energy demands. In Brandenburg's context, big dams or powerful pumps are likely impractical; during prolonged dry spells, there simply isn't enough surplus water to justify them.
Yet the method demands careful planning. Too much water introduced into a basin risks flooding lower-lying areas, which might benefit wetlands but could damage buildings or sensitive ecosystems nearby. Plant roots can suffer if kept too wet for extended periods. The current findings rest on computer modeling with chosen assumptions; real-world implementation would require on-site assessment of each location's infiltration capacity, affected areas, required infrastructure, and operational costs.
The results offer water authorities, boards, and land users a new lens for landscape planning. Instead of watching water rush away during rainstorms only to face scarcity months later, communities could map and activate the small depressions already embedded in their terrain, creating a gentler, more resilient water cycle. What begins as a modest shift in thinking—retain rather than drain—could reshape how Brandenburg sustains itself through increasingly unpredictable weather.