Lake water quality trends, 2004-2013

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Creative Commons Attribution 3.0 New Zealand

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1747
63
Added
29 Sep 2015

This dataset was first added to MfE Data Service on 29 Sep 2015.

When nutrients accumulate in lakes (referred to as ‘nutrient enrichment’) above certain levels, they can make the lakes murky and green with algae, and lower oxygen levels. Lakes with extremely poor water quality are rarely suitable for recreation and provide poor habitats for aquatic species.

Trends in the following parameters are provided:
Trophic Level Index 3 (TLI)
Chlorophyll-a (CHLA)
Bottom-water dissolved oxygen (DObottom)
Ammoniacal nitrogen (NH4N)
Oxidised nitrogen (NO3N)
Total nitrogen (unfiltered) (TN)
Dissolved reactive phosphorus (DRP)
Total phosphorus (unfiltered) (TP)

For more information please see:
Larned, S, Snelder, T, Unwin, M, McBride, G, Verburg, P, McMillan, H (2015).Analysis of Water Quality in New Zealand lakes and Rivers: data sources, data sets, assumptions, limitations, methods and results. NIWA Client Report no. CHC2015-033. Available at data.mfe.govt.nz/x/DDui3u from the Ministry for the Environment dataservice.

This dataset relates to the "Lake water quality: Trophic Level Index" measure on the Environmental Indicators, Te taiao Aotearoa website.

Table ID 52538
Data type Table
Row count 3724
Services Web Feature Service (WFS), Catalog Service (CS-W), data.govt.nz Atom Feed

Lake water quality, 2009–13

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Creative Commons Attribution 3.0 New Zealand

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You must attribute the creator in your own works.

1598
47
Added
17 Feb 2016

This dataset was first added to MfE Data Service on 17 Feb 2016.

"The Lake Trophic Level Index (TLI) characterises the life supporting capacity of a lake based on nutrient enrichment. In general, the higher the TLI score, the poorer the water quality in the lake. Lakes with extremely poor quality are rarely suitable for recreation and provide poor quality habitat for aquatic species.
Care should be taken when interpreting these results. Monitored lakes consist of about 4 percent of all New Zealand lakes, and programmes may focus on those that have poor water quality or are at risk due to the type of land use in their catchment.
After checking for data consistency, the lakes considered suitable for national comparison are sparsely and unevenly distributed, with gaps in the Manawatu, Taranaki, Tasman, Marlborough, Otago, and West Coast regions. The lakes considered in the analysis are located mainly in Northland, Bay of Plenty, Hawke’s Bay, and Canterbury.
This dataset relates to the ""Lake water quality: trophic level index"" measure on the Environmental Indicators, Te taiao Aotearoa website.
"

Layer ID 53310
Data type Vector point
Feature count 86
Services Vector Query API, Web Feature Service (WFS), Catalog Service (CS-W), data.govt.nz Atom Feed

Lake water quality state percentiles, by monitoring site, 2009-2014

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Creative Commons Attribution 3.0 New Zealand

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You must attribute the creator in your own works.

1216
54
Added
29 Sep 2015

This dataset was first added to MfE Data Service on 29 Sep 2015.

When nutrients accumulate in lakes (referred to as ‘nutrient enrichment’) above certain levels, they can make the lakes murky and green with algae, and lower oxygen levels. Lakes with extremely poor water quality are rarely suitable for recreation and provide poor habitats for aquatic species.

Percentile calculations for the following parameters are provided:
Trophic Level Index 3 (TLI)
Chlorophyll-a (CHLA)
Bottom-water dissolved oxygen (DObottom)
Ammoniacal nitrogen (NH4N)
Oxidised nitrogen (NO3N)
Total nitrogen (unfiltered) (TN)
Dissolved reactive phosphorus (DRP)
Total phosphorus (unfiltered) (TP)

For more information please see:
Larned, S, Snelder, T, Unwin, M, McBride, G, Verburg, P, McMillan, H (2015).Analysis of Water Quality in New Zealand lakes and Rivers: data sources, data sets, assumptions, limitations, methods and results. NIWA Client Report no. CHC2015-033. Available at data.mfe.govt.nz/x/DDui3u from the Ministry for the Environment dataservice.

This dataset relates to the "Lake water quality: Trophic Level Index" measure on the Environmental Indicators, Te taiao Aotearoa website.

Table ID 52537
Data type Table
Row count 5632
Services Web Feature Service (WFS), Catalog Service (CS-W), data.govt.nz Atom Feed

Lake Submerged Plant Index, 1991–2016

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Creative Commons Attribution 3.0 New Zealand

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1161
10
Added
25 Apr 2017

This dataset was first added to MfE Data Service on 25 Apr 2017.

Submerged plants are good indicators of the ecological quality of lakes. Because they are attached to the bed of lakes, submerged plants are easy to observe and identify, and they are unable to move away from environmental changes. The plant species found within lakes can tell us about their level of habitat degradation and exotic weed invasion.

The file contains Lake submerged plant index scores for each sampling occasion.

Table ID 53606
Data type Table
Row count 248
Services Web Feature Service (WFS), Catalog Service (CS-W), data.govt.nz Atom Feed

Lake water quality state 2013–2017 data quality

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Creative Commons Attribution 4.0 International

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0
0
Added
16 Apr 2019

This item was first added to MfE Data Service on 16 Apr 2019

3
Document ID21925
File namelake-water-quality-state-20132017-data-quality.pdf
TypePDF
Size504 KB

Lake water quality state 2013–2017 raw data

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Creative Commons Attribution 4.0 International

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0
0
Added
16 Apr 2019

This item was first added to MfE Data Service on 16 Apr 2019

Document ID21926
File namelake-water-quality-state-20132017-raw-data.csv
TypeCSV
Size174 KB

Lake water quality trends data quality

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Creative Commons Attribution 4.0 International

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0
0
Added
16 Apr 2019

This item was first added to MfE Data Service on 16 Apr 2019

3
Document ID21927
File namelake-water-quality-trends-data-quality.pdf
TypePDF
Size517 KB

Lake water quality 10 year trends, raw data

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Creative Commons Attribution 4.0 International

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0
0
Added
16 Apr 2019

This item was first added to MfE Data Service on 16 Apr 2019

Document ID21928
File namelake-water-quality-10-year-trends-raw-data.csv
TypeCSV
Size167 KB

Lake water quality 20 year trends, raw data

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Creative Commons Attribution 4.0 International

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0
0
Added
16 Apr 2019

This item was first added to MfE Data Service on 16 Apr 2019

Document ID21929
File namelake-water-quality-20-year-trends-raw-data.csv
TypeCSV
Size47.4 KB

Lake water quality 28 year trends, raw data

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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.

0
0
Added
16 Apr 2019

This item was first added to MfE Data Service on 16 Apr 2019

Document ID21930
File namelake-water-quality-28-year-trends-raw-data.csv
TypeCSV
Size23.8 KB
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