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When the city harms its own water resources

When the city harms its own water resources

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Uploaded 16 Feb 2012 by GRID-Arendal
Year: 2009
From collection: Vital Water Graphics 2
Author: Philippe Rekacewicz
Description:
In areas where surface water is not readily available (located far from areas of need), groundwater is the primary water source. Groundwater aquifers supply an estimated 20% of the global population living in arid and semi-arid regions. Despite their widespread presence, groundwater aquifers in arid areas receive only limited or seasonal recharge, making such aquifers susceptible to rapid depletion. The Northern Sahara Basin Aquifer, for example, was exploited at almost twice its replenishment rate during the 1990s, causing many of its springs to stop flowing (Jackson et al., 2001). The rapid shift of populations to urban areas is causing ever-greater demands on groundwater resources, particularly in the developing world. Where cities are located above productive aquifers and are far from surface water supplies, groundwater is usually the primary freshwater source. It is primarily exploited through hand-dug wells or drilled boreholes (Foster et al., 1998). Although urban aquifers ...
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