Territory Stories

Darwin Harbour in good health



Darwin Harbour in good health


Westra Van Holthe, Willem

Political affiliation

Country Liberals


Media Releases for 12th Assembly 2012 - 2016; Media Releases; ParliamentNT






Made available by via the Publications (Legal Deposit) Act 2004 (NT)




Oceans; Marine life

Publisher name

Northern Territory Government

File type



Issued as a Media Release

Copyright owner

Northern Territory Government

Parent handle


Citation address


Related items

https://hdl.handle.net/10070/528211; https://hdl.handle.net/10070/528213

Page content

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

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