This hydrogeological system GIS dataset provide a nationally-consistent basis for hydrogeological mapping in New Zealand. Hydrogeological systems are defined here as geographical areas with broadly-consistent hydrogeological properties, and similar resource pressures and management issues. The ‘NZ_hydrogeologicalsystem_polygon.shp’ provides seven hydrogeological attributes as follows: unique name (HS_name), unique identification (HS_id), system type (HS_type), coastal information (HS_coast), aquifer overview (HS_overview), geology and age group (HS_geo_gr) and geology and age descriptor (HS_geo_age). Nine system types are identified (see figure below). The ‘NZ_hydrogeologicalsystem_boundary.shp’ attribute table identifies, the source and methods of boundary delineation. Attribute names, descriptions and values for both datasets are detailed in Moreau et al. 2019. DOI: https://doi.org/10.21420/HTZ8-Z141 Cite as: GNS Science. (2018). New Zealand Hydrogeological Systems [Data set]. GNS Science. https://doi.org/10.21420/HTZ8-Z141

The Aquifer Potential Map is a preliminary map (version 1.0). This work was carried out as part of the GNS Science Groundwater Resources of New Zealand research programme, and future plans within this research programme include the refinement and update of this map. In its current form, the map is considered suitable for refining surficial aquifer boundaries on the regional scale where these boundaries have not been updated since 2001. Future updates of the dataset will reduce the uncertainty and extend the applicability of the data set. The New Zealand 1:250,000 geological map (QMAP) lithological and chrono-stratigraphic information (i.e., main rock type; geological age; and secondary rock type) were used to carry out a nationwide assessment of surficial hydrogeological units and their properties. A number of subsequent map products were produced. The work is described in Tschritter et al. 2017. One of these, the Aquifer Potential map, shows a good match with the most recent New Zealand national aquifer boundary dataset of Moreau and Bekele (2015). Additionally, the Aquifer Potential map provides a quick and simple way to communicate basic large-scale hydrogeological information. DOI: https://doi.org/10.21420/4KJH-5Z44 Cite data as: GNS Science. (2017). New Zealand Aquifer Potential Map Version 1.0 [Data set]. GNS Science. https://doi.org/10.21420/4KJH-5Z44 Cite report as: Tschritter, C.; Westerhoff, R.S.; Rawlinson, Z.J.; White, P.A. 2017 Aquifer classification and mapping at the national scale - phase 1 : identification of hydrogeological units. Lower Hutt, N.Z.: GNS Science. GNS Science report 2016/51. 52 p.; doi: 10.21420/G2101S [Link to electronic copy]

The GGW database is operated and maintained by the Institute of Geological and Nuclear Sciences Limited (GNS Science). It contains geochemical (chemistry and sampling), hydrological, geological and/or geophysical information for Sites (Features) in New Zealand. Included in the database are the datasets for the National Groundwater Monitoring Programme (NGMP) and Wairaikei Analytical, Recording, Thermo Dynamic System (WARTS) projects maintained and operated by GNS Science. The database design was adapted for New Zealand from Australian Standards. DOI: https://doi.org/10.21420/9QTA-4884 Cite as: Geothermal and GroundWater Database. 2005–. Lower Hutt (NZ):GNS Science. https://doi.org/10.21420/9QTA-4884