Water Resources in Tunisia March 4, 2020 Surface water resources are also constrained by the irregularity in rainfall between months and years. Moreover, surface water resources have a very high inter-annual variability, with a minimum of 780 MCM/yr, as observed in 1993-1994 Tags: Desalination in Tunisia - Ichkeul Basin - Medjerda River - Nebhana - Rainfall in Tunisia - Surfacewater in tunisia - water availability in Tunisia - Water basins in Tunisia - water resources in Tunisia - water reuse in Tunisia