Definition:
Annual amount of water withdrawn from renewable aquifers and which is not replenished (average overexploitation of aquifers). When the action is continuous, it is a form of overdraft of rechargeable aquifers or mining. Over a long period of time, there is a risk of depleting the aquifer when the abstraction exceeds the recharge.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
Blue Plan, 2000, Water Resources and Uses in the Mediterranean Countries: Figures and Facts