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

24 Elizabeth River 2014 5.4 Elizabeth River Estuary The estuary is characterised by a relatively long residence time in the upper reaches compared to outer and middle parts of the harbour. The catchment area around the estuary is subject to increasing commercial and urban development with the mid to outer reaches characterised by port activities and other industrial development. Elizabeth River estuary indirectly receives licensed wastewater discharge from Myrmidon Creek, and sediment and nutrient loads from diffuse sources during the wet season. Figure 9 summarises the results of each water quality parameter measured at the Elizabeth River Estuary monitoring sites. Table 8 below reports median values and 20th-80th percentiles (compliance), minimum and maximum values of the data measured. Table 8 - Summary of water quality parameters measured in Elizabeth River estuary All water quality parameters measured complied with the WQOs: Water quality within the reporting zone of the Elizabeth River estuary is in excellent condition. pH and dissolved oxygen measured in upper parts were generally lower compared to those measured in more open parts of the harbour. Indicators Water Quality Objectives Elizabeth Upper min-max 20th-80th percentiles and (median) pH 6.5-8.5 7.3-8.05 7.4-7.7 (7.6) Dissolved oxygen (% saturation) 80-100 79.9-114.7 82-94 (89) Suspended solids (mg/L) <10 0.66-12.84 2.09 Chlorophyll a (g/L) <4 0.39-2.04 0.8 No (g/L) <20 3-30 9.5 Ammonia (g/L) <20 1-10 2.5 Total nitrogen (g/L) <300 120-260 170 Total phosphorus (g/L) <30 5-15 5 Filterable reactive phosphorus (g/L) <10 2-9 4 2014 rating A 24

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