Monitored sites in the Waipaoa catchment
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Key subcatchments of the Waipaoa include the Waikohu, Mangatu, Waingaromia, Wharekopae, and Te Arai.
Some of the subcatchments are particularly susceptible to soil erosion, notably in the Waingaromia and Mangatu areas. As a result, the bed in the lower reaches of the catchment is building up due to sediment and gravel deposition. The Poverty Bay flats and the city are protected by the stopbanks of the Waipaoa River Flood Control Scheme but since their construction 60 years ago, flood capacity has been lost and the scheme is about to be upgraded again at substantial cost. Annual suspended sediment load for the Waipaoa catchment is 15 million tonnes or 33.54 cubic metres per second. This amount of sediment enters Poverty Bay.
Despite the high sediment loads of the lower reaches of the Waipaoa catchment many of the tributaries in the headwaters provide habitat for a range of indigenous fish species. These species rely on migration up the river system as juveniles and return to the sea as adults. Eels are one example in the fishery that requires this ability to migrate.
Trout are present in the Wharekopae tributary. They have been introduced and are not known to migrate.
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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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