Update of National Groundwater Quality Indicators: State and Trends_metadata

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Creative Commons Attribution 3.0 New Zealand

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513
16
Added
19 Oct 2015

This item was first added to MfE Data Service on 19 Oct 2015

Raw data, and state and trend calculations for key groundwater quality indicators, including nitrate-nitrogen, ammoniacal-nitrogen, dissolved reactive phosphorus, dissolved iron, dissolved manganese, total dissolved solids content, and electrical conductivity.

Statistics reported on include:
- median and median absolute deviation
- percentiles
- trend magnitudes
- statistical test p-values (from the Mann-Kendall trend test, Kruskal-Wallis test for seasonality, and sign-tests and Wilcoxon rank-sum tests for distribution differences).

The following report and spreadsheets relate to the "Ground water quality" measures on the Environmental Indicators, Te taiao Aotearoa website:
- Moreau M, Daughney C, 2015. Update of National Groundwater Quality Indicators: State and Trends December 2004-2013, GNS Science Consultancy Report 2015/16. 38 p.
- Spreadsheet2_NGMP_results
- Spreadsheet1_NGMP_metadata
- raw_data_for trends_NGMP.

Document ID11709
File nameupdate-of-national-groundwater-quality-indicators-state-and-trends_metadata.xlsx
TypeXLSX
Size437 KB

Groundwater quality state 2010–2014 data quality

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Creative Commons Attribution 4.0 International

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You must attribute the creator in your own works.

301
18
Added
14 Apr 2019

This item was first added to MfE Data Service on 14 Apr 2019

4
Document ID21900
File namegroundwater-quality-state-20102014-data-quality.pdf
TypePDF
Size522 KB

Groundwater quality, state, 2014-18

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Creative Commons Attribution 4.0 International

You may use this work for commercial purposes.

You must attribute the creator in your own works.

303
15
Added
07 Apr 2020

This dataset was first added to MfE Data Service on 07 Apr 2020.

This indicator measures groundwater quality in New Zealand’s aquifers and how it is changing over time, based on measurements made at monitored sites. We report on nitrate-nitrogen, ammoniacal nitrogen, dissolved reactive phosphorus, chloride, conductivity and Escherichia coli (E. coli) including:

  • median values for the period 2014–18
  • nitrate-nitrogen median values compared to the expectation for natural conditions, using a guideline value of 3 grams per cubic metre (g/m3) based on Daughney and Reeves (2005) and Morgenstern and Daughney (2012)
  • the proportion of samples from each site that have concentrations of nitrate-nitrogen or E. coli in excess of the Maximum Acceptable Values for protection of human health (Ministry of Health, 2018).

More information on this dataset and how it relates to our environmental reporting indicators and topics can be found in the attached data quality pdf.

Table ID 104569
Data type Table
Row count 14644
Services Web Feature Service (WFS), Catalog Service (CS-W), data.govt.nz Atom Feed
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