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The total water resources in Tunisia are estimated (by DGRE) at 4,825 million cubic metres (Mm³), of which 2,125 Mm³ are groundwater. Of this volume, there is an estimated 745 Mm³ of groundwater stored in phreatic (unconfined) aquifers (55% in the north of the country; 30% in the centre; and 15% in the south). Some 1,380 Mm³ of groundwater is stored in deep (confined) aquifers, of which only some 650 Mm³ is renewable (18% in the north; 24% in the centre; and 58% in the south).  
 
The total water resources in Tunisia are estimated (by DGRE) at 4,825 million cubic metres (Mm³), of which 2,125 Mm³ are groundwater. Of this volume, there is an estimated 745 Mm³ of groundwater stored in phreatic (unconfined) aquifers (55% in the north of the country; 30% in the centre; and 15% in the south). Some 1,380 Mm³ of groundwater is stored in deep (confined) aquifers, of which only some 650 Mm³ is renewable (18% in the north; 24% in the centre; and 58% in the south).  
  
Abstraction from phreatic aquifers in 2000 was estimated at 780 Mm³, from 90,000 wells. This is equivalent to 105% of the estimated total storage in phreatic aquifers. Abstraction from deep aquifers in 2000 was estimated at 1,100 Mm³, from 3,500 boreholes. This is equivalent to 80% of the estimated total storage in deep aquifers.  
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Abstraction from phreatic aquifers in 2000 was estimated at 780 Mm³, from 90,000 wells. This is equivalent to 105% of the estimated total storage in phreatic aquifers. Abstraction from deep aquifers in 2000 was estimated at 1100 Mm³, from 3,500 boreholes. This is equivalent to 80% of the estimated total storage in deep aquifers.  
  
 
The DGRE publishes an annual report on the exploitation of deep aquifers; and a report every 5 years on the exploitation of phreatic aquifers.
 
The DGRE publishes an annual report on the exploitation of deep aquifers; and a report every 5 years on the exploitation of phreatic aquifers.

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