Interpretation of the 2017 groundwater age tracer and isotope results for the Christchurch aquifer system

Mike K. Stewart & Rob W. van der Raaij
This report interprets the results from groundwater age tracer and isotope measurements in the Christchurch aquifer system in 2017. The study included carbon-14, tritium and trace gases measured at GNS, stable isotopes (oxygen-18 and deuterium), and water chemistry measured at the same time (results given in Appendices 1 and 2). The interpreted mean ages and water sources are compared with results from measurements from each decade between 1976 and 2006 to see how the system...
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