Darwin Harbour in good health
Westra Van Holthe, Willem
Country Liberals
Media Releases for 12th Assembly 2012 - 2016; Media Releases; ParliamentNT
2015-03-04
Darwin
Made available by via the Publications (Legal Deposit) Act 2004 (NT)
English
Oceans; Marine life
Northern Territory Government
application/pdf
Issued as a Media Release
Northern Territory Government
https://hdl.handle.net/10070/254788
https://hdl.handle.net/10070/528215
https://hdl.handle.net/10070/528211; https://hdl.handle.net/10070/528213
44 West Arm 2014 5.10 West Arm The Arm has extensive mangrove habitat, inter-tidal mudflats and large areas that are exposed on spring tides. The West Arm reporting zone includes a series of large tidal creeks and Woods inlet. The western boundary of Darwin Harbour comprises only minor development (small rural blocks of Cox Peninsula) with flows constrained to wet season run-off from largely intact undisturbed catchment. West Arm is considered to be undisturbed and typically used as reference condition in Darwin Harbour. Figure 20 summarises the results of each water quality parameter measured. Table 14 reports median values and 20th-80th percentiles (compliance), minimum and maximum values of the data measured. Table 14 - Summary of water quality parameters measured in West Arm All water quality parameters measured complied with the WQOs: Water quality within the West Arm monitoring zone is in excellent condition. No specific spatial or temporal trend has been identified in West Arm for the parameters studied over the last year maintaining excellent water quality condition. Indicators Water Quality Objectives West Arm min-max 20th-80th percentiles and (median) pH 6.5-8.5 7.49-8.3 7.7-7.8 (7.9) Dissolved oxygen (% saturation) 80-100 67-106 76-101 (91.8) Suspended solids (mg/L) <10 1.1-5.1 2.3 Chlorophyll a (g/L) <4 0.38-1.63 1.09 No (g/L) <20 4-22 14 Ammonia (g/L) <20 1-10 4 Total nitrogen (g/L) <300 120-200 165 Total phosphorus (g/L) <30 5-10 5 Filterable reactive phosphorus (g/L) <10 1-7 4 2014 rating A 44