Water resources
Water in Tunisia

With a surface area of 164,420 km², Tunisia has rainwater resources estimated at 36 km³/year. Total water resources (blue water) are estimated at 4.85 km³/year, of which 2.7 km³/year is average runoff. The remainder, 2.15 km³/year, is underground runoff, from which withdrawals were estimated at 2 km³ 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.

Surface water inflow is highly variable from year to year, with a minimum of 0.78 km³/year and a maximum of 11 km³/year; the max/min ratio ranges from 9 in the north to 180 in the south