Search all sites near me now
Search your favourite swimming spots

Waiau River

The Waiau River catchment lies on the eastern edge of Fiordland, and is Southland’s largest catchment. The Waiau drains Lake Te Anau into Lake Manapouri, from where electricity is hydro generated. This deep river then flows down to the sea, through Tuatapere, at Te Waewae Bay. Its major tributary is the Mararoa River. The Waiau catchment contains a large number of lakes, and is the least developed of the four major catchments.

The Waiau catchment has been developed for hydro-electric power generation, with the Manapouri Hydro-Electric Power Scheme operating on the western arm of Lake Manapouri, resulting in the diversion of up to 90% of the flow in the catchment. The Waiau and Mararoa Rivers are often subject to extensive algal growths and at times blooms of the invasive Didymo.

Both rainbow and brown trout are present . There are sea run fish in the lower section below the Tuatapere Bridge.

During the summer there is weekly monitoring at some sites. See the Environment Southland website for details.

Sites 18

Monitored sites in the Waiau River catchment

...retrieving sites.

No sites found.

Show more
Scientific Indicators
Scientific data for this catchment

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

The state for the catchment is represented by the median concentration for the parameter across all sites within the catchment and then compares that value to the quartiles for all monitored sites in New Zealand.

Click on the parameters state icons to compare this catchment with others in the region.

  • State

    State shows how the median of samples from this site compares to other sites

  • 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 and the statistical analysis and interpretation of the results presented.

If all Cawthron ticks are green, then you can trust this data. However, if one or more ticks are orange, then conclusions should be treated with some caution.

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

Can I trust the data?
Data Collection

All samples were collected using approved field protocols and have been analysed in accredited laboratories. Therefore the data shown here has been collected and analysed following best practice.

State

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

Trend - Adjustment for flow

This data is not flow adjusted. National guidelines suggest that flow-sensitive variables are flow 'adjusted' before trend analysis. Therefore, any trends shown here may be affected by variations in flow across sampling occasions.

Bacteria

E. coli
State
{{stateMsg(ECOLI.StateScore)}}
Trend
{{trendMsg(ECOLI)}}

Clarity

Clarity

Black disc
State
{{stateMsg(BDISC.StateScore)}}
Trend
{{trendMsg(BDISC)}}

Clarity

Turbidity
State
{{stateMsg(TURB.StateScore)}}
Trend
{{trendMsg(TURB)}}

Nitrogen

Nitrogen

Total Nitrogen
State
{{stateMsg(TN.StateScore)}}
Trend
{{trendMsg(TN)}}

Nitrogen

Total Oxidised Nitrogen
State
{{stateMsg(TON.StateScore)}}
Trend
{{trendMsg(TON)}}

Nitrogen

Ammoniacal Nitrogen
State
{{stateMsg(NH4.StateScore)}}
Trend
{{trendMsg(NH4)}}

Phosphorus

Phosphorus

Dissolved Reactive Phosphorus
State
{{stateMsg(DRP.StateScore)}}
Trend
{{trendMsg(DRP)}}

Phosphorus

Total Phosphorus
State
{{stateMsg(TP.StateScore)}}
Trend
{{trendMsg(TP)}}

Download Data

.ZIP file of indicator readings for all sites in New Zealand
Download
Disclaimer

 LAWA Partners shall not be liable, whether in contract, tort, equity or otherwise, for any loss or damage of any type (including consequential losses) arising directly or indirectly from the inadequacy, inaccuracy or any other deficiency in information supplied irrespective of the cause.  Use of information supplied is entirely at the risk of the recipient and shall be deemed to be acceptance of this liability exclusion.