Monitored sites in the Waiapu catchment
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Further inland, the Waitohaia River flows into the Mata River. The Waiapu River has a catchment of 173,400 ha, much of which is very prone to erosion. Much progress has been made over the past 40 years in afforesting the eroding areas and encouraging areas to return to indigenous scrub, but the Waiapu remains the most sediment laden river in the Gisborne District. The annual suspended sediment load is 36 million tonnes. This translates to 90.47 cubic metres of sediment flowing out to sea per second.
The eroding gravels are rapidly raising the bed of the river in the lower reaches, causing riverbank erosion that is threatening Ruatoria township. A number of bridges over tributaries have been raised in recent years in response to rising riverbeds. The river catchment is mostly covered in native bush (more than 80%) with the remaining area covered in scrub and coastal forest.
There a three species of nationally threatened and at risk birds that have been identified as breeding on the braided lower reaches of the Waiapu.
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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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