Water Turbidity

AUS-AIF-IND-WTU General Moderate confidence

Benchmark Value

No specific value — see range

Range: 530 to 550 NTU

Optimal Range: 530 to 550

Direction: Lower is desirable ↓

Form: OptimalRange

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 9 benchmarks together — the OptimalRange form drives the primary score, while 8 guard(s) constrain the result.

Contributing Benchmarks

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

Evidence & Context

The study reports a median turbidity of 530 NTU for Cooper Creek and 550 NTU for the Warrego River during the no-flow phase. Selecting a range of 530–550 NTU as the benchmark is the most scientifically defensible approach.

Metric Definition:

Water turbidity measured as Nephelometric Turbidity Units (NTU) representing the median turbidity observed during the critical no-flow phase in waterhole refugia of arid ephemeral rivers.

Benchmark Definition:

This benchmark represents the median water turbidity range during the no-flow phase in waterholes of arid ephemeral rivers, reflecting the natural and healthy state of these ecosystems under industrial and infrastructure land use.

Justification:

Derived from peer-reviewed field measurements in representative arid ephemeral river systems during the ecologically critical no-flow phase.

Sources (2)

Preview of Water quality of surface water environments - NSW Government Water, accessed August 1, 2025,

Water quality of surface water environments - NSW Government Water, accessed August 1, 2025, Government

National Guidelines for Water Quality | Department of Natural ...

View Source

Preview of WATER STEWARDSHIP - Leading Practice Sustainable ..., accessed July 24, 2025

WATER STEWARDSHIP - Leading Practice Sustainable ..., accessed July 24, 2025 Journal

(PDF) Water quality in two Australian dryland rivers: spatial and ..., accessed July 20, 2025

View Source

Supporting Sources (12)

Additional references from the underlying research that informed this benchmark.

Preview of An environmental flow to an ephemeral creek increases the input of carbon and nutrients to a downstream receiving river - Frontiers, accessed July 20, 2025

An environmental flow to an ephemeral creek increases the input of carbon and nutrients to a downstream receiving river - Frontiers, accessed July 20, 2025

Irrelevant Government

An environmental flow to an ephemeral creek increases the input of carbon and nutrients to a downstream receiving river - Frontiers, accessed July 20, 2025

View Source

Assessing Water Quality - Secondary Education Years 9 to 12 - Upper Murrumbidgee Waterwatch, accessed August 12, 2025,

Contextual Support Journal

Assessing water quality - ACT Waterwatch.

View Source

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

Contextual Support Journal

Turbidity | Australia state of the environment 2021

View Source

Environment Monitoring Systems & Data for Ecosystem Studies ..., accessed July 30, 2025,

Contextual Support Government

(PDF) Evaluation of genetic markers for the metabarcoding of ...

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Evaluating Water Management Practice for Sustainable Mining - MDPI, accessed July 20, 2025

Contextual Support Journal

Evaluating Water Management Practice for Sustainable Mining - MDPI, accessed July 20, 2025

View Source

National Guidelines for Water Quality - Department of Natural Resources and Environment Tasmania, accessed August 1, 2025,

Contextual Support

Using the ANZECC Guidelines and Water Quality Objectives in NSW

View Source

Preview of Persistence of in-stream waterholes in ephemeral rivers of tropical northern Australia and potential impacts of climate change - CSIRO PUBLISHING | Marine and Freshwater Research, accessed July 18, 2025,

Persistence of in-stream waterholes in ephemeral rivers of tropical northern Australia and potential impacts of climate change - CSIRO PUBLISHING | Marine and Freshwater Research, accessed July 18, 2025,

Contextual Support Journal

Persistence of in-stream waterholes in ephemeral rivers of tropical northern Australia and potential impacts of climate change - CSIRO PUBLISHING | Marine and Freshwater Research

View Source

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

Contextual Support Government

Turbidity | Australian Drinking Water Guidelines - NHMRC, accessed August 3, 2025

View Source

Water Management in the Australian Minerals Industry - UQ eSpace - The University of Queensland, accessed July 20, 2025

Contextual Support Journal

Water Management in the Australian Minerals Industry - UQ eSpace - The University of Queensland, accessed July 20, 2025

View Source

Water management in the Pilbara – time for a more strategic approach?

Contextual Support Journal

WATER STEWARDSHIP - Leading Practice Sustainable ..., accessed July 20, 2025

View Source

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)

View Source

WESTERN AUSTRALIAN WATER QUALITY GUIDELINES FOR FRESH AND MARINE WATERS - DBCA Library, accessed July 16, 2025,

Contextual Support Journal

WESTERN AUSTRALIAN WATER QUALITY ... - DBCA Library, accessed July 25, 2025,

View Source

Context

Region Australia
Biome Arid Inland Floodplains & Ephemeral River Systems
Land Use Industrial & Infrastructure Use
Assessment Not Stated
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 3 Jun 2026

Notes

No upper detrimental threshold for natural turbidity is supported as the ecosystem is adapted to very high turbidity levels. Detrimental impacts arise from anthropogenic sedimentation, not turbidity itself. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

Other benchmarks in the AUS-AIF-IND-WTU family.