Freshwater

The environmental health of the Wet Tropics freshwater basins is assessed on water quality, habitat and hydrology, and fish. For 2015-16 scores and grades are provided where data is available, with further development required for the fish index.

The nine basins included in the Wet Tropics Report Card region are Daintree, Mossman, Barron, Mulgrave, Russell, Johnstone, Tully, Murray and Herbert. From the available data, overall grades for all basins are provided, with the Daintree grade of ‘very good’, the Mossman and Murray grade of ‘moderate’ and all other basins a grade of ‘good’.

Compared to 2014-15, the Barron increased in overall score and grade due to its higher water quality index score. The increase in grade for the Tully from ‘moderate’ to ‘good’ was related to the inclusion of the invasive weeds indicator in the 2015-16 reporting period.

There has now been two consecutive reporting years (2014-15 and 2015-16) with dry conditions and low discharge across most of the region. These conditions can provide better water quality results for basins due to reduced runoff and erosion and associated sediment, nutrient and pesticide mobilisation compared to wetter years.

Freshwater

indicators and confidence

freshwaterlegend

Grading

gradesa1

very good

gradesb1

good

gradesc1

moderate

gradesd1

poor

gradese1

very poor

insufficient data

Confidence surrounding the data used in the coasters has been assessed using a multi-criteria framework.

confidence

Environmental results

click on the grades for more information about each zone

 

Further information on the methods used to produce the scores and grades and detailed results can be found here.