Turbidity monitoring

Turbidity is a measure of the cloudiness in water caused by suspended material.  During the project, this will be managed throughout the project using an adaptive management approach and real-time monitoring.

Turbidity is measured in Nephelometric Turbidity Units (NTU). Should the nominated NTU limits set by the EPA be exceeded, the dredge contractor will take action and either adjust or cease dredging.   The limits and actions are summarised below


Turbidity monitoring data – updated hourly below

The line graphs show the median level of turbidity recorded by each monitoring buoy, calculated over a rolling 6 day and 15 day median.  If turbidity increases due to dredging activities, the D1 and D2 lines on the graph will rise.

If turbidity has increased due to background conditions unrelated to dredging, for example, due to a storm or weather event, B1 will rise on the graph. If B1 rises, D1 and D2 may naturally rise too and follow a similar line. Remember to refresh your browser to make sure that you have the most current data. Please note that the Turbidity Monitoring Data is best viewed on a desktop computer.

The below graphs show the 6 and 15 rolling median levels of turbidity from July until 9 October 2019.

Historical Turbidity Monitoring

Turbidity monitoring commenced in July 2018 to gather baseline data on background turbidity levels prior dredging commencing. Below is a summary plot of the approximately 11 months of turbidity data collected prior to commencement of dredging in June 2019.


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