Use of Geoelectrical Resistivity to Delineate the Seawater Intrusion in the Northwestern Part of the Nile Delta, Egypt

Mapping of the boundaries between freshwater and saltwater was helpful in surface resistivity surveys because of the high electric conductivity of saltwater relative to freshwater. A total of 30 electrical soundings were measured to configurate the seawater intrusion. Accordingly, two zones of groundwater quality were delineated: the slightly freshwater zone in the southern part, with resistivity range of 15–90 Ω m, and the brackish water to saltwater zone, with a very low resistivity of