Reasons and implications of fossil hydraulic gradients in large-scale aquifer systems

Stephan Schulz , Hyekyeng Jung , Marc Walther , Nils Michelsen , Randolf Rausch & Christoph Schüth
Due to limited availability of surface water, many arid and semi-arid countries have to rely on their groundwater resources. Despite the quasi-absence of present-day replenishment, some of these aquifers contain large amounts of water that was recharged during wetter periods in the past. Although these recharge events often occurred several thousand years ago, some of these so-called fossil aquifer systems exhibit considerable hydraulic gradients and flow towards their discharge areas, even without pumping. As a...
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