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MODELING OF THE LIMESTONE AQUIFER USING ISOTOPES, MAJOR, AND TRACE ELEMENTS IN THE WESTERN RIVER NILE BETWEEN BENI SUEF AND EL MINIA

A robust classification scheme for partitioning groundwater chemistry into homogeneous groups was an important tool for the characterization of Eocene limestone aquifer. The aquifer locally composed of chalky limestone with thin clay intercalated (Samalut Fm.), the fissures, the joints, and the fractures represent the conduits of the aquifer system. The flow patterns are conditioned by karstification processes which develop a conduit network and preserve low permeability microfractured blocks. The aquifer is mainly recharge by surrounding aquifers and agricultural wastewaters. The groundwater flows in the eastern part (due the Bahr Yossef and River Nile), which is a discharge areas rather than a recharge. Twentyeight groundwater samples were collected from the Eocene aquifer and analyzed for isotopes, major and trace elements. �D and � 18 O concentrations ranged widely due to geology, infiltration of different surface waters, evaporation, and hydrogeology. The ���