Water Turbidity

AUS-TSR-CON-WTU General High confidence

Benchmark Value

2 NTU

Range: — to 3 NTU

Optimal Range: — to 3

Direction: Lower is desirable ↓

Form: MaximumOnly

Scoring Curve

This curve shows how a field measurement for this indicator would score across all available benchmark forms in this context. The scoring engine uses 8 benchmarks together — the OptimalRange form drives the primary score, while 7 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary UpperThreshold Guard MaximumOnly Guard OptimalRange Guard MinimumOnly Guard MaximumOnly Guard OptimalRange Guard MinimumOnly Guard

Evidence & Context

The recommended reference value is a median turbidity of less than 2 Nephelometric Turbidity Units (NTU).

Metric Definition:

Median turbidity in freshwater streams representing the best available natural condition achievable within protected Australian tropical rainforest catchments.

Benchmark Definition:

This benchmark represents the median turbidity level in freshwater streams of protected tropical rainforest catchments in Australia, indicating the best natural water clarity achievable under pristine conditions.

Justification:

Derived from the Wet Tropics Waterways Report Card program, reflecting the least disturbed 20% of sites and representing the best available condition in protected rainforest catchments.

Sources (1)

Preview of Wet Tropics Waterways Report Card Program Design 2021

Wet Tropics Waterways Report Card Program Design 2021

Supporting Sources (28)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Water Quality Degradation of Coastal Waterways in the Wet Tropics, Australia, accessed August 2, 2025,

(PDF) Water Quality Degradation of Coastal Waterways in the Wet Tropics, Australia, accessed August 2, 2025,

Contextual Support

Requirements for graziers | Environment, land and water ..., accessed July 19, 2025,

Preview of A Compendium of Ecological Information on Australia's Northern Tropical Rivers - Report 5 - Water quality - DCCEEW, accessed August 1, 2025,

A Compendium of Ecological Information on Australia's Northern Tropical Rivers - Report 5 - Water quality - DCCEEW, accessed August 1, 2025,

Contextual Support Journal

Threshold Indicator Taxa ANalysis and change points (dots) for the ...

Preview of Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000) - V, accessed July 22, 2025

Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000) - V, accessed July 22, 2025

Contextual Support Journal

1.5.2.1 Surface water - Bioregional Assessments |

Preview of Characterising the relationship between water quality and water quantity, accessed August 5, 2025

Characterising the relationship between water quality and water quantity, accessed August 5, 2025

Contextual Support Journal

Report Card 2022-23 - EPA Victoria

Preview of Determining Tipping Points and Responses of Macroinvertebrate Traits to Abiotic Factors in Support of River Management - PubMed Central, accessed July 16, 2025,

Determining Tipping Points and Responses of Macroinvertebrate Traits to Abiotic Factors in Support of River Management - PubMed Central, accessed July 16, 2025,

Direct Evidence Journal

Determining Tipping Points and Responses of Macroinvertebrate Traits to Abiotic Factors in Support of River Management. Water, 15(8), 1589.

Preview of Full article: Relationships between algal primary productivity and environmental variables in tropical floodplain wetlands - Taylor & Francis Online, accessed August 2, 2025,

Full article: Relationships between algal primary productivity and environmental variables in tropical floodplain wetlands - Taylor & Francis Online, accessed August 2, 2025,

Contextual Support

Full article: Relationships between algal primary productivity and environmental variables in tropical floodplain wetlands - Taylor & Francis Online, accessed August 2, 2025,

Preview of Marine ecosystem impacts - Reef 2050 Water Quality Improvement Plan, accessed August 1, 2025,

Marine ecosystem impacts - Reef 2050 Water Quality Improvement Plan, accessed August 1, 2025,

Contextual Support Journal

TERN: Terrestrial Ecosystem Research Network - The Waite, accessed July 27, 2025,

Preview of Queensland Reef Water Quality Program | Environment, land and water, accessed August 3, 2025,

Queensland Reef Water Quality Program | Environment, land and water, accessed August 3, 2025,

Contextual Support Government

Queensland Reef Water Quality Program | Environment, land and water, accessed August 2, 2025,

Preview of Queensland Water Quality Guidelines 2009, accessed July 21, 2025,

Queensland Water Quality Guidelines 2009, accessed July 21, 2025,

Contextual Support Journal

Queensland Water Quality Guidelines 2009

Preview of Reef Water Quality Report Card 2020 Great Barrier Reef Marine Monitoring Program Methods, accessed July 22, 2025

Reef Water Quality Report Card 2020 Great Barrier Reef Marine Monitoring Program Methods, accessed July 22, 2025

Contextual Support Journal

Reef Water Quality Report Card 2020 Great Barrier Reef Marine Monitoring Program Methods, accessed July 22, 2025

Preview of Regional report cards | Reef 2050 Water Quality Improvement Plan, accessed July 21, 2025,

Regional report cards | Reef 2050 Water Quality Improvement Plan, accessed July 21, 2025,

Contextual Support Government

Regional report cards | Reef 2050 Water Quality Improvement Plan, accessed July 21, 2025,

Preview of REPORT CARD 2024 - Wet Tropics Waterways, accessed July 22, 2025

REPORT CARD 2024 - Wet Tropics Waterways, accessed July 22, 2025

Contextual Support Journal

REPORT CARD 2024 - Wet Tropics Waterways, accessed July 22, 2025

Preview of Report Card Explainer - Reef 2050 Water Quality Improvement Plan, accessed August 2, 2025,

Report Card Explainer - Reef 2050 Water Quality Improvement Plan, accessed August 2, 2025,

Contextual Support Journal

Report Card Explainer - Reef 2050 Water Quality Improvement Plan, accessed August 2, 2025,

Preview of Results - Wet Tropics Waterways, accessed July 22, 2025

Results - Wet Tropics Waterways, accessed July 22, 2025

Contextual Support

Results - Wet Tropics Waterways, accessed July 22, 2025

Preview of Science in Water Quality - Reef & Rainforest Research Centre, accessed August 2, 2025,

Science in Water Quality - Reef & Rainforest Research Centre, accessed August 2, 2025,

Contextual Support

Science in Water Quality - Reef & Rainforest Research Centre, accessed July 22, 2025,

Preview of Spatiotemporal variability of light attenuation and net ecosystem metabolism in a back-barrier estuary, accessed July 22, 2025

Spatiotemporal variability of light attenuation and net ecosystem metabolism in a back-barrier estuary, accessed July 22, 2025

Contextual Support Journal

Spatiotemporal variability of light attenuation and net ecosystem metabolism in a back-barrier estuary, accessed July 22, 2025

Preview of Temporal dynamics in coral bioindicators for water quality on coastal coral reefs of the Great Barrier Reef - CSIRO Publishing, accessed July 22, 2025

Temporal dynamics in coral bioindicators for water quality on coastal coral reefs of the Great Barrier Reef - CSIRO Publishing, accessed July 22, 2025

Contextual Support Direct Evidence Journal

Temporal dynamics in coral bioindicators for water quality on coastal coral reefs of the Great Barrier Reef - CSIRO Publishing, accessed July 22, 2025

Preview of Tour TERN's rainforest monitoring SuperSite | TERN Australia, accessed July 22, 2025

Tour TERN's rainforest monitoring SuperSite | TERN Australia, accessed July 22, 2025

Contextual Support Government

Robson Creek Flux Data Release 2022_v2 - TERN Data Discovery Portal

Preview of Towards environmental management of water turbidity within open coastal waters of the Great Barrier Reef - PubMed, accessed July 22, 2025

Towards environmental management of water turbidity within open coastal waters of the Great Barrier Reef - PubMed, accessed July 22, 2025

Contextual Support Journal

Towards environmental management of water turbidity within open coastal waters of the Great Barrier Reef - PubMed, accessed July 22, 2025

Preview of Turbidity | Australian Drinking Water Guidelines - NHMRC, accessed August 11, 2025,

Turbidity | Australian Drinking Water Guidelines - NHMRC, accessed August 11, 2025,

Contextual Support Government

Australian Drinking Water Guidelines

Preview of Turbidity and light attenuation in coastal waters of the Great Barrier Reef - ResearchOnline@JCU, accessed August 2, 2025,

Turbidity and light attenuation in coastal waters of the Great Barrier Reef - ResearchOnline@JCU, accessed August 2, 2025,

Contextual Support Journal

Australian prawn farming manual Part 4-9.pdf, accessed July 21, 2025,

Preview of Turbidity and light attenuation in coastal waters of the Great Barrier Reef, accessed July 22, 2025

Turbidity and light attenuation in coastal waters of the Great Barrier Reef, accessed July 22, 2025

Contextual Support GreyLiterature

Turbidity and light attenuation in coastal waters of the Great Barrier Reef, accessed July 22, 2025

Preview of Underwater Light Characteristics of Turbid Coral Reefs of the Inner Central Great Barrier Reef - Frontiers, accessed July 22, 2025

Underwater Light Characteristics of Turbid Coral Reefs of the Inner Central Great Barrier Reef - Frontiers, accessed July 22, 2025

Contextual Support Journal

Underwater Light Characteristics of Turbid Coral Reefs of the Inner Central Great Barrier Reef - Frontiers, accessed July 22, 2025

Preview of Water quality guidelines - Queensland Environment Department, accessed August 1, 2025,

Water quality guidelines - Queensland Environment Department, accessed August 1, 2025,

Contextual Support Government

Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000)

Preview of Water Quality Guidelines for the Great Barrier Reef Marine Park., accessed August 3, 2025,

Water Quality Guidelines for the Great Barrier Reef Marine Park., accessed August 3, 2025,

Contextual Support Journal

Great Barrier Reef Marine Park Authority (GBRMPA). (2010). Water Quality Guidelines for the Great Barrier Reef Marine Park. Rev. ed. 35

Preview of Water-quality and ecosystem impacts of recreation in streams: Monitoring and management, accessed July 22, 2025

Water-quality and ecosystem impacts of recreation in streams: Monitoring and management, accessed July 22, 2025

Contextual Support Journal

Using the ANZECC Guidelines and Water Quality Objectives in NSW, accessed July 19, 2025,

Preview of Waterhouse, J. (2010) Thresholds of major pollutants with regard to ..., accessed July 22, 2025

Waterhouse, J. (2010) Thresholds of major pollutants with regard to ..., accessed July 22, 2025

Contextual Support Journal

Waterhouse, J. (2010) Thresholds of major pollutants with regard to impacts on instream and marine ecosystems, accessed July 21, 2025,

Preview of wet tropics report card 2024 - waterway environment results, accessed July 18, 2025,

wet tropics report card 2024 - waterway environment results, accessed July 18, 2025,

Contextual Support

wet tropics report card 2024 - waterway environment results, accessed July 18, 2025

Context

Region Australia
Biome Tropical & Subtropical Rainforests
Land Use Conservation / Protected Natural Areas
Assessment Pristine Reference
Vegetation Forest
Evidence Type ReferenceCondition

Lifecycle

Status Retired
Version 1
Effective From 15 Mar 2026
Effective To 24 Mar 2026

Notes

No lower critical threshold applicable. Optimal turbidity range is less than 3 NTU. A significant upper detrimental threshold exists at approximately 5 NTU, where severe stress occurs in key aquatic organisms. Retired via Evidence Integrity Review on 2026-03-24 09:41 UTC — all DirectEvidence sources confirmed dead or inaccessible.

Related Benchmarks

Other benchmarks in the AUS-TSR-CON-WTU family.