Use of Conductivity Survey in Defining a Policy of Rehabiltation of a Salt Affected Oasis in Tunisia

Segdoud is an oasis situated at 70 km south-ouest of Gafsa, south Tunisia (Fig. 1) downwards small colluvial fans produced by quaternary wadis, descending from cretaceous Jebel el Negueb. This material, interbedded with mio-pliocène clays and marls, and ancient terrases of oued Mit is rich in gypsum and magnesium salts.