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Whangamoa River

The Whangamoa River is one of the largest rivers in the Nelson region with a catchment of 8,400 ha and mean flow of 2 cumecs at the confluence of Collins River. It is located to the north-east of the Wakapuaka catchment and is fed from the Bryant and Whangamoa Ranges by the Collins River, Graham Stream, Dencker Creek and smaller tributaries.

Land use in the upper catchment is dominated by protection and production forest. In the mid catchment, the valley floor has been developed for farming but the valley sides and ridges are still mainly in native forest or in plantation forest. The land use in the lower catchment is also dominated by production forest, with only the valley bottom and lower slopes developed for farming and lifestyle blocks.

The Whangamoa River catchment is regionally significant because of the relative diversity and intactness of remaining indigenous ecosystems from the upland zone through to the coastal zone. While the typical historic pattern of rural development has meant that much of the alluvial flats and lowland hill country have been converted into farmland and forestry, excellent examples of mineral belt communities, riparian forest, lowland and upland beech forest, and estuarine communities remain. The best remaining natural dune system in Tasman Bay is at the river mouth. The main body of the estuary is largely unmodified. A large sand spit encloses the estuary, which constricts the outlet to a narrow channel.

Sites 5

Monitored sites in the Whangamoa River catchment

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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

This site is not sampled during high flows so the data shown only represents base flow conditions. Proposed national guidelines recommend sampling during both low and high flows to get a full picture of water quality at the site.

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
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Trend
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Clarity

Clarity

Black disc
State
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Trend
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Clarity

Turbidity
State
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Trend
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Nitrogen

Nitrogen

Total Nitrogen
State
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Trend
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Nitrogen

Total Oxidised Nitrogen
State
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Trend
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Nitrogen

Ammoniacal Nitrogen
State
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Trend
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Phosphorus

Phosphorus

Dissolved Reactive Phosphorus
State
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Trend
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Phosphorus

Total Phosphorus
State
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Trend
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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.