The lagoon system receives three types of water: (a) marine
waters through an artificial entrance, which are dominant, (b)
hydro-geological contributions of two aquifers: Gareb, located
south of the River Selouane, and Bou Areg, located near the
southern margin of the lagoon, and (c) surface waters from the
periodic
flow of 10 small rivers (wadis). Among these, the river
Selouane is the largest, in which is dumped the municipal and
industrial waste of the village of Selouane (Ruiz et al., 2006).