The study is based on a descriptive statistical approach aimed at analysing and processing hydrogeochemical data of groundwater draining the geological formations of the Beni Hassan Dorsal. The study area is located in the northern part of Morocco, in the Northern Rif. The latter is part of the Flyschs nappes and part of the calcareous dorsal of the Rifaine chain to the south-east of the city of Tetouan. The formations of the main calcareo-dolomitic and detrital geomorphological units constitute an important reservoir in the study area. An inventory of the main resurgences of water points was carried out around the Dorsal and the sandstone massif. Consequently, 7 water points (including 6 springs and 1 well) were the subject of an in situ physico-chemical measurement, a chemical analysis in the laboratory, and in addition a hydrogeological study. The main water springs in the studied area spring up along abnormal contacts of the calcareo-dolomitic Dorsal with impermeable formations. Aquifers in the study area are generally of two types, depending on their physical attributes. They are therefore two types of natural groundwater reservoirs: fissured aquifers and aquifers in porous media. Generally speaking, from a chemical standpoint, the groundwater in the study area is less mineralized to moderately mineralized and shows bicarbonate-calcium chemical facies.

The flysch formations, due to their lithology, are rarely characterized, as hydrogeological prospecting target. However they are full of significant water resources in the study area located in the west of the city of Tetouan in northern Morocco. These water resources were evaluated relaying on the limits determining and exploring of different aquifers included called "Limited aquifer systems". These aquifers three in number (Numidian system of Zinat, the Melloussa-Tisiren system and Quaternary-Tangier unit system), are characterized by a lithostratigraphic and structural context promoting storage of water. They were identified from: the inventory of water points, effectuation of lithologic and structural maps and geological cross-sections. This was complemented by measurement of groundwater levels and flow releases. So, it could reveal the impact of stratigraphic and structural context of the area on the establishment aquifer systems as well as their limitations.