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Lower Ashley Catchment

The Waipara – Waimakariri zone (WWZ) (including the Ashley river), covers an area of 59 955 km2 and contains two distinct regions, the high country and the lower plains. The area has a temperate climate, characterised by warm, dry summers and cool winters with an average annual rainfall of 4450 mm in the headwaters to 650 mm at the coast. The Waimakariri River is a large braided alpine River, highly valued for several ecological values, aesthetics and recreational activities. Many tributaries run into the Waimakariri as it flows across the plains, such as the Cust, Cam and Kaiapoi Rivers. Smaller rivers in the zone are the Ashley and Waipara further north of the Waimakariri.

Twenty four sites are monitored in the WHZ as part of Environment Canterbury’s state of environment monitoring programme. The sampling sites are representative of a range of land uses and catchment land cover in the WWZ.

Increased demand for water abstraction and intensive landuse pressures are the main pressures on water resources within the WWZ. The best water quality is often observed in the upper reaches of rivers where there has been less degradation and anthropogenic activity. The poorest water quality is typically found at sites the further near the coast where waterways are under pressure from increasing landuse intensification, degradation and urbanisation.

Sites 3

Monitored sites in the Lower Ashley Catchment 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

All samples were collected using approved field protocols and have been analysed in accredited laboratories. Therefore the data shown here can be trusted.

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.