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Lake Waahi Centre (Surface)

Water Quality
Water quality data for this site
Can I trust this data?

This dashboard shows information on the data collected by the regional councils for water quality indicators, analysed as state and trend.

  • State

    The state is represented by comparison to the National Objectives Framework (NOF) in the National Policy Statement for Freshwater Management 2014

  • Trend

    Trend shows how the quality of water is changing over time. Depending on the sampling history duration, five and ten year timescales are available:

Can I trust this data?

The Cawthron Institute has worked alongside regional councils to verify the processes and methods used for data collection, laboratory analysis of samples collected, quality assurance and the statistical analysis and interpretation of the results presented.

For more details on each tick, see our 'Can I Trust This Data?' Factsheet.

Can I trust the data for this site?
Data Collection

Lake water quality is being monitored in this region. Proposed National Guidelines suggest that all councils should monitor lake water quality as part of their State of the Environment Monitoring Programmes, if lakes occur in the region.

State - Sampling

All samples were collected using approved field protocols and have been analysed in accredited laboratories.

State - Quality Assurance - Data Processing

Data at this site has not had any form of data processing measures applied. Therefore, the data shown here is less robust and needs to be treated with caution.

State - Quality Assurance - Quality Coding

Data shown for this site has had some form of quality coding applied. Therefore the data shown here is more robust than data without any quality coding.

Trend - Sampling Frequency

Samples are collected bimonthly at this site. Proposed national guidelines suggest monthly sampling is required for robust trend analysis. Therefore, any trends shown here are less robust than those calculated from data collected monthly.

Phosphorus

Total Phosphorus
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State
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N/A
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Trend
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Total Phosphorus sample history at this site

Showing:
–
Total Phosphorus samples for Lake Waahi Centre (Surface)
mg/m³
Date

What is this graph showing me?

This graph is displaying Total Phosphorus concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

Find out about how State and Trend are calculated.

What do the icons mean?

The bands for Total Phosphorus are as outlined in the NOF for freshwater:

A
Lake ecological communities are healthy and resilient similar to natural reference conditions
B
Lake ecological communities are slightly impacted by additional algal and plant growth arising from nutrients levels that are elevated above natural conditions
C
Lake ecological communities are moderately impacted by additional algal and plant growth arising from nutrients levels that are elevated well above natural reference conditions
National bottom line: Annual median 50 mg/m³
D
Lake ecological communities have undergone or are at high risk of a regime shift to a persistent, degraded state, due to impacts of elevated nutrients leading to excessive algal growth and/or plant growth, as well as from losing oxygen in bottom waters of deep lakes

Download data history as a .csv file

 Download data

Nitrogen

Nitrogen

Total Nitrogen
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State
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{{stateMsg('TN', TN.StateScore)}}
N/A
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Trend
{{trendMsg('TN', TN)}}

Total Nitrogen sample history at this site

Showing:
–
Total Nitrogen samples for Lake Waahi Centre (Surface)
mg/m³
Date

What is this graph showing me?

This graph is displaying Total Nitrogen concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

Find out about how State and Trend are calculated.

What do the icons mean?

The bands for Total Nitrogen are as outlined in the NOF for freshwater:

A
Lake ecological communities are healthy and resilient similar to natural reference conditions
B
Lake ecological communities are slightly impacted by additional algal and plant growth arising from nutrients levels that are elevated above natural conditions
C
Lake ecological communities are moderately impacted by additional algal and plant growth arising from nutrients levels that are elevated well above natural reference conditions
National bottom line: 750 mg/m³ for seasonally stratified and brackish lakes. 800 mg/m³ for polymictic lakes.
D
Lake ecological communities have undergone or are at high risk of a regime shift to a persistent, degraded state, due to impacts of elevated nutrients leading to excessive algal growth and/or plant growth, as well as from losing oxygen in bottom waters of deep lakes

Download data history as a .csv file

 Download data

Nitrogen

Ammonia
{{medianValue('NH4N')}}
State
{{NH4N.StateScore | uppercase}}
{{stateMsg('NH4N', NH4N.StateScore)}}
N/A
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Trend
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Ammonia sample history at this site

Showing:
–
Ammonia samples for Lake Waahi Centre (Surface)
mg NH4-N/l
Date

What is this graph showing me?

This graph is displaying Ammoniacal Nitrogen concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

Find out about how State and Trend are calculated.

What do the icons mean?

The bands for Ammonia are as outlined in the NOF for freshwater:

A
99% species protection level: No observed effect on any species tested
B
95% species protection level: Starts impacting occasionally on the 5% most sensitive species
C
80% species protection level: Starts impacting regularly on the 20% most sensitive species (reduced survival of most sensitive species)
National bottom line: Annual median 1.30 mg NH4-N/L. Annual maximum 2.20 mg NH4-N/L (milligrams ammoniacal-nitrogen per litre).
D
Starts approaching acute impact level (ie risk of death) for sensitive species

Download data history as a .csv file

 Download data

Algae

Algae

Chlorophyll a
{{medianValue('CHLA')}}
State
{{CHLA.StateScore | uppercase}}
{{stateMsg('CHLA', CHLA.StateScore)}}
N/A
{{stateMsg('CHLA', CHLA.StateScore)}}
Trend
{{trendMsg('CHLA', CHLA)}}

Chlorophyll a sample history at this site

Showing:
–
Chlorophyll a samples for Lake Waahi Centre (Surface)
mg/m³
Date

What is this graph showing me?

What do the icons mean?

The bands for Chlorophyll a are as outlined in the NOF for freshwater:

A
Lake ecological communities are healthy and resilient, similar to natural reference conditions
B
Lake ecological communities are slightly impacted by additional algal and/or plant growth arising from nutrient levels that are elevated above natural conditions
C
Lake ecological communities are moderately impacted by additional algal and plant growth arising from nutrient levels that are elevated well above natural reference conditions. Reduced water clarity is likely to affect habitat available for native macrophytes
National bottom line: Annual median 12 mg/m³. Annual maximum 60 mg/m³.
D
Lake ecological communities have undergone or are at high risk of a regime shift to a persistent, degraded state (without native macrophyte/seagrass cover), due to impacts of elevated nutrients leading to excessive algal and/or plant growth, as well as from losing oxygen in bottom waters of deep lakes

Download data history as a .csv file

 Download data

Algae

Cyanobacteria
{{medianValue('CYAN')}}
State
{{CYAN.StateScore | uppercase}}
{{stateMsg('CYAN', CYAN.StateScore)}}
N/A
{{stateMsg('CYAN', CYAN.StateScore)}}
Trend
{{trendMsg('CYAN', CYAN)}}

Cyanobacteria sample history at this site

Showing:
–
Cyanobacteria samples for Lake Waahi Centre (Surface)
mm³/l
Date

What is this graph showing me?

What do the icons mean?

The bands for Cyanobacteria are as outlined in the NOF for freshwater:

A
Risk exposure from cyanobacteria is no different to that in natural conditions (from any contact with fresh water)
B
Low risk of health effects from exposure to cyanobacteria (from any contact with fresh water)
C
Moderate risk of health effects from exposure to cyanobacteria (from any contact with fresh water)
National bottom line: 80th percentile = 1.8 mm³/L biovolume equivalent of potentially toxic cyanobacteria OR 10 mm³/L total biovolume of all cyanobacteria.
D
High health risks (eg, respiratory, irritation and allergy symptoms) exist from exposure to cyanobacteria (from any contact with fresh water)

Download data history as a .csv file

 Download data

Clarity

Secchi disc depth
{{medianValue('SECCHI')}}
State
{{SECCHI.StateScore | uppercase}}
{{stateMsg('SECCHI', SECCHI.StateScore)}}
N/A
{{stateMsg('SECCHI', SECCHI.StateScore)}}
Trend
{{trendMsg('SECCHI', SECCHI)}}

Secchi disc depth sample history at this site

Showing:
–
Secchi disc depth samples for Lake Waahi Centre (Surface)
metres
Date

What is this graph showing me?

What do the icons mean?

The grades for Secchi disc depth are defined as follows:

A
Water clarity is greater than 7 metres in depth
B
Water clarity is greater than 3 metres and less than 7 metres in depth
C
Water clarity is greater than 1 metre and less than 3 metres in depth
D
Water clarity is less than 1 metre in depth

Download data history as a .csv file

 Download data

Bacteria

E. coli
State
Not measured
Trend
Not measured

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