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<p>Groundwater overexploitation from irrigated agriculture is accelerating in major food-producing regions, threatening long-term water and food security. Managed aquifer recharge (MAR), the intentional storage of available water in aquifers, could help buffer hydrologic extremes by diverting high flows for infiltration. Here we present a first-order global screening of spreading-based MAR potential across irrigated lands (2002–2021) by integrating Gravity Recovery and Climate Experiment-derived monthly groundwater depletion, high-magnitude flow and unsustainable irrigation water consumption. We estimate high-magnitude flow volumes under 90th and 95th percentile thresholds and weight them with a region-/monthly-specific feasibility coefficient representing infiltration suitability, evaporative competition and off-season crop-area availability. Globally, MAR could offset 4–6% of unsustainable irrigation, with hotspots reaching more than 50% offset (for example, Europe and Southeast Asia) but lower potential in basins such as the Ganges and the Central Valley (3–7%). Our results warrant subsequent regional assessments to evaluate technical, economic and governance/policy feasibility, as well as site-specific design.</p>

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Global managed aquifer recharge potential as a solution to water scarcity

  • 期刊论文

  • 发表日期：

    2026年7月2日

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  • Andrea Citrini,
  • Bridget R. Scanlon,
  • Ashraf Rateb,
  • Gang Zhao,
  • Matteo Sangiorgio,
  • Lorenzo Rosa

摘要

Groundwater overexploitation from irrigated agriculture is accelerating in major food-producing regions, threatening long-term water and food security. Managed aquifer recharge (MAR), the intentional storage of available water in aquifers, could help buffer hydrologic extremes by diverting high flows for infiltration. Here we present a first-order global screening of spreading-based MAR potential across irrigated lands (2002–2021) by integrating Gravity Recovery and Climate Experiment-derived monthly groundwater depletion, high-magnitude flow and unsustainable irrigation water consumption. We estimate high-magnitude flow volumes under 90th and 95th percentile thresholds and weight them with a region-/monthly-specific feasibility coefficient representing infiltration suitability, evaporative competition and off-season crop-area availability. Globally, MAR could offset 4–6% of unsustainable irrigation, with hotspots reaching more than 50% offset (for example, Europe and Southeast Asia) but lower potential in basins such as the Ganges and the Central Valley (3–7%). Our results warrant subsequent regional assessments to evaluate technical, economic and governance/policy feasibility, as well as site-specific design.