Darwin Harbour report card 2018

Zone 4: West Arm

2018 report card overview

Water quality in the West Arm was excellent.

Zone 4 West Arm grade wheel

About West Arm

West Arm has extensive mangrove habitat, inter-tidal mudflats and large inter-tidal 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 catchment comprises only minor rural development on Cox Peninsula.

West Arm is considered to be relatively undisturbed with stream inflows limited to wet season run-off from a largely intact undisturbed catchment.

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Long-term trend

Zone 4 West Arm trends

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 4 West Arm turbidity
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 4 West Arm chlorophyll-a
Nutrients indicator – Nitro oxide, ammonia and soluble phosphorus concentrations parameterZone 4 West Arm phosphorusZone 4 West Arm ammoniaZone 4 West Arm nitrogen oxide

Supplementary parameters

Zone 4 West Arm salinity

Zone 4 West Arm temperature

Zone 4 West Arm pH levels

Last updated: 07 June 2019

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