Monitored sites in the Omaka River catchment
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Many of the streams draining the Southern (Wairu) Valleys are intermittent and tend to dry up in the lower reaches during the summer. As a result groundwater for the irrigation of crops and for domestic drinking water is in high demand on the lower plains. Viticulture is the dominant land use on the plains, historically dairying also occurred, but has nearly disappeared. Over the last ten years viticulture has grown from 900 hectares to over 9,000 hectares.
The high country areas are predominately pastoral with some exotic forestry. The lower tributaries of the Omaka (the Taylor and the Opaoa) flow through Blenheim, the biggest urban centre (approx. 25,000 population) in Marlborough. Water quality in the lower reaches is affected by stormwater runoff from the town. The Taylor River and Lower Opaoa are valued as recreational rivers with swimming and kayaking being popular during the summer months. In addition there are numerous reserves through which the rivers flow which are popular with walkers and picnickers.
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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.
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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