Monitored sites in the Rangitata River catchment
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The Maori name "Rangitata" (Rakitata) has been variously translated as "day of lowering clouds", "close sky", and "the side of the sky.
Before the Rangitata crosses the plains, part of it is diverted to the Rangitata Diversion Race (RDR) for irrigation and hydroelectric generation with eventual discharge into the Rakaia River. Towards its mouth, the river splits into two large braids, forming a large delta island called Rangitata Island. This island is crossed by State Highway 1 and the Main South Line railway between Ealing and Rangitata. The Rangitata River has a celebrated Chinook salmon (Oncorhynchus tshawytscha) fishery, it is also highly valued for it's recreational (e.g. jet boating and kayaking), aesthetic and ecological values. On 23 December 1999 Fish and Game New Zealand lodged an application for a water conservation order on the Rangitata River. In June 2006, the water conservation order was gazetted.
Nine sites on the Rangitata and tributary streams are monitored in the Environment Canterbury state of environment monitoring programme. Sampling site locations are representative of a range of land uses and catchment land cover in the Rangitata River catchment. Water quality data indicates that the river demonstrates low nutrient concentrations in the upper catchment that become increasingly impacted from point and non-point source contaminants further downstream.
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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.
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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