Territory Stories

Darwin Harbour in good health

Details:

Title

Darwin Harbour in good health

Member

Westra Van Holthe, Willem

Political affiliation

Country Liberals

Collection

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

Date

2015-03-04

Location

Darwin

Notes

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

Language

English

Subject

Oceans; Marine life

Publisher name

Northern Territory Government

File type

application/pdf

Use

Issued as a Media Release

Copyright owner

Northern Territory Government

Parent handle

https://hdl.handle.net/10070/254788

Citation address

https://hdl.handle.net/10070/528215

Related items

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

Page content

16 Middle Harbour 2014 5.2 Middle Harbour The eastern part of Middle harbour receives stormwater runoff from Darwins urban area. Monitoring locations extend from the East Arm boundary across to the Western side of the harbour and south towards Channel Island. The area is a busy conduit for shipping traffic and marine services. Figure 5 summarises the results of all water quality parameters measured at the Middle Harbour monitoring sites. Table 5 reports median values and 20th-80th percentiles (compliance), minimum and maximum values of the data measured. Table 5 - Summary of water quality parameters measured in Middle Harbour All water quality parameters complied with WQOs for the mid estuary category: Water quality at the Middle Harbour reporting zone is in excellent condition. No specific spatial or temporal trend has been identified in Middle Harbour for the parameters studied over the last year. Last reporting year the Middle Harbour rated a B with departures for dissolved oxygen. The 2014 median values were all compliant with local benchmarks. Indicators Water Quality Objectives Middle Harbour min-max 20th-80th percentiles and (median) pH 7.0-8.5 7.78-8.35 7.8-8.2 (8.0) Dissolved oxygen (% saturation) 80100 90.5-107.2 92-105 (100) Suspended solids (mg/L) <10 0.72-5.646 2 Chlorophyll a (g/L) <2 0.33-0.94 0.5 NO (g/L) <20 11-29 16.5 Ammonia (g/L) <20 1-8 4 Total nitrogen (g/L) <270 80-190 130 Total phosphorus (g/L) <20 5-10 5 Filterable reactive phosphorus (g/L) <5 1-6 4 2014 rating A 16


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