Darwin Harbour report card 2018

Zone 1: Elizabeth River estuary

The 2018 report card overview

Water quality in the Elizabeth River estuary was excellent.

Zone 1 Elizabeth River grade wheel. Clarity is good, disolved oxygen good, water clarity good and nutrients good. Over score - A.

About Elizabeth River estuary

The Elizabeth River estuary contains seagrass beds that provide feeding grounds for dugong and turtles.

Large parts of the estuary are still lined with mangroves but industrial development along the foreshore has reduced mangrove cover in recent years.

The estuary receives urban stormwater runoff from the city of Palmerston during the wet season and dispersed discharge from the Palmerston wastewater treatment plant that enters the harbour in Myrmidon Creek.

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Long-term trend

Zone 1 Elizabeth River long term trends - from 2009 to 2018. Current status is level A. No change since 2017

Data summary

The distribution of the data for all parameters is shown here as box and whisker plots.

For report card grades the median of the data (solid line in the box) is compared to the Water Quality Objective (dotted line) for each parameter.

Zone 1 Elizabeth River turbidity - shows a range to be between 2.5 to 5.0
Dissolved oxygen indicator – Oxygen saturation parameterZone 1 Elizabeth River dissolved oxygen (% saturation) - shows a range to be between 80 and 100
Algae indicator – Chlorophyll-a concentration parameterZone 1 Elizabeth River chlorophyll-a - shows a range to be between below 1.0 to about 2.5
Nutrients indicator – Nitro oxide, ammonia and soluble phosphorus concentrations parameterZone 1 Elizabeth River filterable reactive phosphorus - shows a range to be between 0.0 and 7.0Zone 1 Elizabeth River ammonia - shows a range to be between 0 and 10.Zone 1 Elizabeth River nitrogen oxide - shows a range to be between 0 to 21.

Supplementary parameters

Zone 1 Elizabeth River salinity - shows the range to be between 30.0 and 35.0

Zone 1 Elizabeth River temperature - Shows a range to be between 28 to 30 degrees

Zone 1 Elizabeth River pH levels - Shows a range to be between 7.5 and 8.0

Last updated: 07 June 2019

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