Wairarapa Valley groundwater : residence time, flow pattern, and hydrochemistry trends

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SR_2005-033-pdf
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Morgenstern, U. 2005 Wairarapa Valley groundwater : residence time, flow pattern, and hydrochemistry trends . Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences science report 2005/33 36 p.

Abstract: The Wairarapa groundwater system has a complicated hydrogeological setting as it evolved from sea level changes, tectonic activity, and geomorphic process. Due to increasing groundwater demand a better understanding of the groundwater resources is required to help achieve effective management and sustainable use. In addition to previous ‘classical’ hydrogeology studies, this report represents the first stage of a comprehensive approach using age dating and chemistry time trends for understanding the Wairarapa groundwater system. The methodology of groundwater age dating and mixing models is described in Appendix 1. Historic tritium data were evaluated, and combined with new tritium and CFC/SF6 data to allow for robust age dating. (auth)