Abstract
The Tadla basin is situated to the south of the Moroccan Meseta; it is limited by the overlapping north Atlas rocks and contains an important aquifer within the Turonian limestones. The unconfined ground water to the north becomes confined to the south. The piezometric map shows that the flows converge towards the Wadi Tessaout downgradient following a large NE-SW drainage axis which represents a highly permeable zone. The water flow and the environmental isotopes show that the Turonian is supplied at the same time from both the outcrop of the ‘plateau des phosphates’ to the north and the Atlas aquifers to the east. The drainage axis represents a mixing zone. Hydrometric monitoring of the springs of the Wadi Tessaout downgradient, and their hydrochemical and isotopic characteristics, shows that they are common outlest of Miocene-Pliocene-QWuaternary and Turonian aquifers.
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