Appendix 1: Groundwater quality maps
This appendix includes a series of maps showing:
- aquifer lithology
- aquifer confinement
- well depth
- surrounding land use
- median calculated TDS
- median conductivity
- median NO3-N concentration
- median Fe concentration
- median Mn concentration
- median microbiological indicator (MaxMicro)
- trend magnitudes, NO3-N
- trend magnitudes, conductivity.
All maps in this report use a shaded digital elevation model as the base layer. This was obtained from GNS Science’s ArcSDE server. Overlain on top of the DEM is a simplified hydrogeological map of New Zealand. This layer is set to be 60% transparent. The hydrogeological map was created by simplifying and creating a new category within the existing Q-map 1:250,000 shape files. The major lakes shape file was obtained from the GNS Science ArcSDE database. Minor lakes were manually removed from the file. The rivers displayed on the maps came from NIWA’s River Environment Classification system (REC), produced for the Ministry for the Environment in 2004. The maps in this report display rivers classified as 6, 7 and 8. The regional council boundaries were obtained from the GNS Science ArcSDE server.
LCDB2 data were obtained from the Ministry for the Environment. These were produced in 2004 for the Ministry by Terralink International. Eastings and northings of the well sites were used to extract LCDB2 information.
Maps showing aquifer lithology, aquifer confinement and surrounding land use are based on information provided by regional council personnel. In order to compile the lithology and land-use information at the national scale, the regional council names were grouped into a number of categories, as displayed in the following tables.
Table A1: Reported land use and the assigned categories
|
Agricultural |
Urban |
Horticultural |
|---|---|---|
|
Agriculture and stock Chicken Drystock Drystock/lifestyle Horse stud Industry and stock Lifestyle/drystock Livestock Saleyards Rural School and stock Sheep/beef Stock Stock and agriculture Stock and industry |
Domestic Aerodrome Airport Commercial Holiday residential Lifestyle Residential Residential coastal School School grounds Urban Urban/lifestyle |
Agriculture Berries Horticulture Horticultural Lifestyle/orchard/vineyard Market garden Market gardening Nursery Orchard Orchard/dairy Orchard/lifestyle Orchards Plant nursery Plantation Vineyard |
|
Forestry |
Park/reserve |
Dairy |
|
Forest Forestry Glasshouses |
Camping Golf course Motor camp Park/reserve Regional park Rural Seafloor |
Dairy Dairy/drystock Dairy/lifestyle Dairying |
|
Industrial |
||
|
Industrial Light industry Light industry/retail |
||
* Interpreted by GNS Science using land use classifications supplied by regional councils.
Table A2: Reported aquifer lithologies and their assigned categories
|
Sand |
Sandstone |
Pumice |
|---|---|---|
|
Sand Sand and gravel Te Hapara sands Dune sand Sand/silt Sandstone Sand/gravel Pleistocene sand Pleistocene sands (lower) Kaawa sand Kaipara sands Confined aquifer in sand Flowing artesian in sand Unconfined aquifer in sand Unconfined aquifer in undifferentiated alluvium Volcanics Whenuakura Marine terraces Matemateaonga |
Fractured Waitemata sandstone Waitemata sandstone Fractured Waitemata sandstone – geothermal Waitemata sandstones fractured Waitemata sandstone Waitemata sandstone Deep Waitemata sandstone Shallow Waitemata sandstone Fractured Waitemata sandstones – geothermal Sandstone/limestone |
Pumice gravel Pumice sand Pumice sands |
|
Shellbeds |
Gravel |
Ignimbrite |
|
Shell Kaawa shellbed |
Gravel Alluvial gravel Tertiary gravel Gravels Gravels and some lignite Shallow fluvial deposit Waipaoa gravels Matokitoki gravels Makauri gravels Large stones, sand and water stained gravels Manuherikia alluvium Waitaki alluvium River gravels Gravel and clay |
Rhyolite Ignimbrite Volcanic rock Rhyolitic pyroclastics Oruanui ignimbrite Unwelded ignimbrite Taupo ignimbrite Whakamaru ignimbrite Rhyolitic pyroclastic Andesite |
|
Limestone |
Lignite |
Basalt |
|
Limestone Takaka limestone |
Lignite |
Basalt Three Kings basalt Bombay basalt One Tree Hill basalt Drury basalt (upper) Mt Richmond basalt Deep Pukekohe basalt Shallow Pukekohe tephra/weathered basalt |
|
Greywacke |
Clay |
Unknown |
|
Greywacke Basal Waitemata onto greywacke |
Clay |
Unknown Fractured rock |
* Interpreted by GNS Science using aquifer names and/or aquifer lithologies supplied by regional councils.
Figure A1: Aquifer lithology – North Island
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Figure A2: Aquifer lithology – South Island
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Figure A3: Aquifer confinement – North Island
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Figure A4: Aquifer confinement – South Island
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Figure A5: Well depth – North Island
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Figure A6: Well depth – South Island
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Figure A7: Surrounding land use – North Island
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Figure A8: Surrounding land use – South Island
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Figure A9: Median calculated TDS – North Island
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Figure A10: Median calculated TDS – South Island
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Figure A11: Median conductivity – North Island
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Figure A12: Median conductivity – South Island
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Figure A13: Median NO3-N concentration – North Island
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Figure A14: Median NO3-N concentration – South Island
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Figure A15: Median Fe concentration – North Island
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Figure A16: Median Fe concentration – South Island
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Figure A17: Median Mn concentration – North Island
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Figure A18: Median Mn concentration – South Island
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Figure A19: Median microbiological indicator (MaxMicro) – North Island
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Figure A20: Median microbiological indicator (MaxMicro) – South Island
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Figure A21: Trend magnitudes, NO3-N – North Island
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Figure A22: Trend magnitudes, NO3-N – South Island
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Figure A23: Trend magnitudes, conductivity – North Island
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