1. Water resources

1.1 Hydrological context

With a surface area of 164,420 km ² , Tunisia has rainwater resources estimated at 36 km ³ /year. Total water resources (blue water) are estimated at 4.85 km ³ /year, of which 2.7 km ³ /year is average runoff. The remainder, 2.15 km ³ /year, is underground runoff, from which withdrawals were estimated at 2 km ³ in 2010, representing an exploitation rate of 93%. However, this national average conceals major regional disparities, and many aquifer systems are subject to severe overexploitation....