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Urban Streams

Urban streams (ie streams which mainly flow through an urban environment and have high levels of modification) include the Todd Valley Stream, Oldham Creek, Brook Stream, York Stream, Jenkins Creek, Arapiki Stream, Poorman Valley Stream, Orchard Creek, Saxton and Orphanage Creek.

 

Almost all of Nelson's urban streams are in a poor state and no longer provide healthy conditions for the animals and plants that rely on them. Waterways that are physically, chemically and biologically degraded or very degraded  include all of the water bodies in the Stoke area, the Atawhai and Glen streams, and the lower reaches of Brook Stream.

These small urban streams have elevated nitrates, high bacteria levels, poor water clarity, and low aquatic animal scores. Stormwater from household, garden and industrial activities combine with fine sediments and pollutants from roads and earthworks and are transported to the streams in storm water and runoff. Elevated nutrients and high temperatures caused by unshaded stream banks promote increases in aquatic plants and slime during summer months that are detrimental to aquatic animals and limit stream flows.

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Monitored sites in the Urban Streams 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
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