Monitored sites in the Te Wharau catchment
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Main pressures on streams within the BPZ come from agricultural activities, which results in further land modification, vegetation clearance and subsequent increased phosphorus runoff into the waterways. Because these streams are naturally higher in phosphorus, they are susceptible to excessive nutrient concentrations which may lead to degraded water quality and poorer instream aquatic communities.
Whilst streams within the BPZ, typically have high dissolved phosphorus concentrations they have relatively low dissolved nitrogen concentrations. This is largely due to phosphorus-rich soils and generally low input from groundwater. Bacterial concentrations are often very high due to the steep terrain and difficulty fencing out stock from streams draining the steep gullies. Good riparian management in this catchment can assist in reducing the likelihood of excessive phosphorus and bacteria entering streams.
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This dashboard shows information on the data collected by the regional councils for water quality indicators, analysed as
The state for the catchment is represented by theconcentration for the across all sites within the catchment and then compares that value to the for all monitored sites in New Zealand.
Click on the parameters state icons to compare this catchment with others in the region.
State shows how theof samples from this site compares to other sites
Trend shows how the quality of water is changing over time. Depending on the sampling history duration, five and ten year timescales are available:
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.
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.
All samples were collected using approved field protocols and have been analysed in accredited laboratories. Therefore the data shown here can be trusted.
Samples are collected quarterly at this site. Proposed national guidelines suggest monthly sampling is required for trend analysis. Therefore, any trends shown here are less robust than those calculated from data collected monthly. New Zealand's councils are currently reviewing their sampling procedures and aim to adjust their sampling frequency to monthly. This will increase the robustness of the trend analyses.
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.
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