In recent times, we have witnessed increasing pressures on water resources in the Algerian northern Sahara; these are mainly due to the combined effects of socio-economic development of the country, population growth, but also an unfavorable climate with significant erratic rainfall and considerable water deficit. Consequently, water needs are increasing; this resource has lately been dwindling and has become the subject of a competitive utilization between different users. The present study focused on the groundwater of Mio- Plio-Quaternary, in the valley of Oued Righ (Wadi Righ Valley). This region, in the low Algerian Sahara, extends from the South of the palm grove of El Goug to Chott Merouane, between the Wilayas (provinces) of El Oued and Ouargla. The aquifer of the Mio-Plio -Quaternary is an important resource for irrigation and drinking water in the valley. \r\n \r\n In order to study the relationship between the groundwater of the Mio-Plio-Quaternary and Chott Merouane, in Algeria, it seemed to us necessary to present scenarios, based on a mathematical model, using the code \"Visual Mod flow\". The calibration of the model, in steady state and then transient state, allowed checking the reliability of the results related to the geometry and the limits of the aquifer, as well as its hydrodynamic parameters. The exploitation scenarios indicate that the northern part, near Chott Merouane, has a fairly significant vulnerability. To prevent any contact between the groundwater of the Mio-Plio-Quaternary and the wastewater discharged into the Chott, drastic measures must be taken, hence the need for establishing a hydro-agricultural development plan and a wastewater management strategy.\r\n\r\nKEYWORDS: Algeria� Groundwater of Mio-Plio-Quaternary - Chott Merouane - Calibration - Relationship groundwater /Chott - Management.

Username
Password