The major ions in water chemistry contribute to SAL, EC and pH values that were measured in situ using a HANNA
HI 98188 waterproof, portable Conductivity Metre as well as CyberScan PC300 Waterproof Portable pH/ORP/ Conductivity Metres. To obtain exact data on the annual changes of GWD and SAL in this region, 15 Divers and five CTD-Divers (produced by Eijkelkamp) were fixed in 20 F1 wells in April 2010 (Figure 1). The data were recorded by each Diver once every 30 min.