Source:Auckland Council Research and Evaluation Unit, RIMU
The Auckland Council operates a long-term, region-wide marine water quality monitoring programme. The main objective of this programme is to gather data to inform the state of the environment trends and reporting as required under section 35 of the Resource Management Act 1991 (RMA). We use the data to monitor long-term trends in water quality and to assess the efficiency of council initiatives, policies and strategies. This report documents changes to the monitoring programme and provides a summary of the data collected during 2016.
Marine water quality samples were collected monthly by helicopter, boat and from land at 31 sites around the region and 16 parameters are measured in the field and laboratory. Grouped into six geographically distinct sampling runs, the data are presented in box plots, displaying the variation in the measured parameters at each site, and in statistical summary tables for each site and parameter.
To summarise the data, Water Quality Indices (WQI) were calculated assigning a water quality class of excellent, good, fair or poor. This analysis combines water quality measures and compares against selected “reference” sites to provide a readily understood description of the water quality for the site.
Auckland Council technical report, TR2017/033