Catchment nutrient reports
The catchment nutrient reports provide a summary of monitoring data collected at a number of sites in the south-west of Western Australia. They focus on the concentrations and loads of nutrients leaving the catchments and entering the receiving environments (generally estuaries).The reports are produced on a five-yearly basis with annual updates where appropriate. They are available for the Swan Canning and Peel Harvey catchments. For maps of these catchments click here Swan Canning catchment map or Peel Harvey catchment map.
Each nutrient report contains information on all or some of the following (there are slight differences between catchments):
Compliance with targets
Where catchment specific targets exist compliance with these targets is calculated and presented. Compliance is determined using rigorous statistical analysis to ensure that the risk of incorrect reporting is kept to a minimum. For more information on the compliance methodology click here.
Where sufficient data exists trend analysis is performed to determine if there have been any statistically significant trends in the data set. Either the Mann Kendall or the Seasonal Kendall test is used as appropriate. For more information on the trend testing methodology click here.
Status has been calculated for some catchments and provides a simple summary of the available data by classifying it into bands. For more information on how status is calculated click here.
For those sites where sufficient flow and concentration data exists loads have been calculated to give an indication of the mass of nutrients leaving the catchments and entering the receiving environment. Some catchments also have modelled loads presented. For more information on how loads are calculated click here.
Nutrient reports have been prepared for 15 of the catchments of the Swan-Canning estuary:
Nutrient reports have been prepared for 13 of the catchments of the Peel Harvey Estuary