Darwin Harbour report card 2018

Zone 3: Middle Arm

2018 report card overview

Water quality in Middle Arm was excellent.

Zone 3 Middle Arm grade wheel

About Middle Arm

Middle Arm comprises the Blackmore and Pioneer River estuaries. The zone has extensive mangrove fringes and intertidal mudflats.

The Blackmore River flows into Darwin Harbour over the whole year, with dry season flows from Darwin River Dam and Berry Springs.

Most of the zone’s catchment is rural or savannah woodland.

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Long-term trend

Zone 3 Middle 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 3 Middle Arm turbidity
Dissolved oxygen indicator – Oxygen saturation parameterZone 3 Middle Arm dissolved oxygen
Algae indicator – Chlorophyll-a concentration parameterZone 3 Middle Arm chlorophyll-a
Nutrients indicator – Nitro oxide, ammonia and soluble phosphorus concentrations parameterZone 3 Middle Arm phosphorusZone 3 Middle Arm ammoniaZone 3 Middle Arm nitrogen oxide

Supplementary parameters

Zone 3 Middle Arm salinity

Zone 3 Middle Arm temperature

Zone 3 Middle Arm pH levels

Last updated: 07 June 2019

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