Intensity, duration and frequency (IDF) analysis of the seawater quality data at selected dredge-influenced site (Dredg.) and reference site (Ref.) for the Barrow Island, Cape Lambert and Burrup Peninsula dredging programs.

The analysis was carried out separately at daily and hourly temporal scale. Intensity values represent the 95% percentile of turbidity for the site for each period. Duration values represent the 95th percentile of the duration (days) of exceedance events (where exceedance events are defined as an event where the observed value exceeds the 95th percentile (i.e. the intensity threshold) of the baseline state for that site). Frequency represents the number of times the duration of events exceeded the 95th percentile of the duration of exceedance events for the baseline state for that site. Frequency has been normalised per year. ‘Change’ shows the value for the dredge period as a proportion of the baseline.Intensity, duration and frequency (IDF) analysis of the seawater quality data at selected dredge-influenced site (Dredg.) and reference site (Ref.) for the Barrow Island, Cape Lambert and Burrup Peninsula dredging programs.