River water quality: Nitrogen, flow adjusted trends, 1991 - 2020

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Added
11 Aug 2022

This dataset was first added to MfE Data Service on 11 Aug 2022.

Adapted by Ministry for the Environment and Statistics New Zealand to provide for environmental reporting transparency. Dataset used to develop the “River water quality: Nitrogen” indicator, (available at www.stats.govt.nz/indicators/river-water-quality-n...).

Nitrogen in river waters is one of five parameters that provide an overview of New Zealand’s river water quality and how it is changing over time. Nitrogen is an essential nutrient for plants and algae. Some nutrient supply is a natural component of healthy rivers, but agricultural and urban land use, and infrastructure such as wastewater treatment plants, can add more nitrogen to waterways. Too much nitrogen can lead to excessive growth of algae, which can deteriorate river habitats. In very high concentrations, some forms of nitrogen, including nitrate-nitrogen and ammoniacal nitrogen, can be toxic to aquatic life.

This dataset shows:

  • trends in concentrations of total nitrogen, nitrate-nitrite-nitrogen, and ammoniacal nitrogen based on measurements made at monitoring sites during the 10-year period from 2011 to 2020, the 20-year period from 2001 to 2020, and the 30-year period from 1991 to 2020.

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.

Summary report available at environment.govt.nz/publications/environment-aotea....

License

Creative Commons Attribution 4.0 International

You may use this work for commercial purposes.

You must attribute the creator in your own works.

Attachments
1. Nitrogen_fladjtrends_data_quality.pdf 183 KB pdf
Technical Details
Table ID 109657
Data type Table
Row count 25623
Columns field_1, measure_ab, measure, units, sof, nzsegment, lat, long, s_id, n_obs, s, var_s, d, tau, z, p, c, cd, prop_censored, prop_unique, no_censorlevels, median, annual_sen_slope, sen_lci, sen_uci, analysis_note, percent_annual_change, trend_direction, seasonal, freq, period, end_year, q_adj, q_source, trend_confidence
Services Web Feature Service (WFS), Catalog Service (CS-W), data.govt.nz Atom Feed
History
Added 11 Aug 2022
Revisions 3 - Browse all revisions
Current revision Imported on July 17, 2022 from CSV .