ABSTRACT
Groundwater underpins global water, food and industrial systems, yet faces large scale depletion due to unsustainable extraction, climate stress, agricultural demand and governance gaps. This review integrates findings from a global meta analysis of 386 case studies with institutional and technical literature to distill effective strategies and persistent challenges for sustainable groundwater management.Key findings include: (a) supply side interventions (e.g. recharge, infrastructure) often trigger rebound effects, increasing extraction by up to ~52 %; (b) demand side measures (e.g. improved irrigation efficiency) only lead to meaningful aquifer recovery when paired with strict regulation, and otherwise seldom reduce overexploitation below ~3 %; (c) aquifer stabilization occurred in fewer than 30 % of cases, typically when integrated multi measure approaches were used; (d) governance deficitssuch as weak regulation, poor monitoring, fragmented jurisdiction, and lack of stakeholder inclusionare major barriers; and (e) success requires nexus based policy linking water, land, agriculture and local engagement.
Keywords: Aquifer depletion, Groundwater governance, Groundwater sustainability, Demand side management, Rebound effect, Integrated water governance