Isotope hydrology study of the Kalamos Attikis and Assopos riverplain areas in Greece

Variations in the isotopic composition of water were used to define the mechanism of recharge of the Assopos riverplain and the Kalamos Attikis coastal brackish karst springs. The plain is mainly recharged by local rain water, while the karst springs are fed by the Parnis mountain system, the mean recharge altitude being estimated in the order of 870 m. The apparent velocity and the underground pathway of the water feeding the springs were deduced and the most convenient sites for the drilling of production wells for recovery of the spring water before salinization were sited. As a result, 73,000 m³ of water are now pumped per day and used as additional potable water for the Athens area, comprizing about one-sixth of the mean daily consumption.