Water Turbidity

AUS-TGP-AGR-WTU General Moderate confidence

Benchmark Value

50 NTU

Thresholds: Lower: —, Upper: 50

Direction: Lower is desirable ↓

Form: UpperThreshold

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 Point Guard MaximumOnly Guard UpperThreshold Guard MaximumOnly Guard MaximumOnly Guard OptimalRange Guard MaximumOnly Guard

Evidence & Context

Turbidity values that consistently exceed the DGV range for lowland rivers²14that is, > 50 NTU²14are indicative of a highly disturbed and ecologically detrimental state.

Metric Definition:

Water turbidity as an indicator of ecological degradation in freshwater systems.

Benchmark Definition:

This benchmark represents an upper detrimental threshold for turbidity indicating ecological harm in freshwater systems within the Temperate Grassy Woodlands & Plains biome.

Justification:

Values exceeding 50 NTU signify a highly disturbed and ecologically impaired system where aquatic life is negatively impacted.

Sources (2)

Preview of 1.1.5.2 Surface water quality - Bioregional Assessments |, accessed August 5, 2025,

1.1.5.2 Surface water quality - Bioregional Assessments |, accessed August 5, 2025, Government

The Turbidity Effect on Aquatic Life - Number Analytics, accessed July 12, 2025

Preview of Australian and New Zealand Guidelines for Fresh and Marine Water ..., accessed August 5, 2025,

Australian and New Zealand Guidelines for Fresh and Marine Water ..., accessed August 5, 2025, Journal

tuvalu-data.sprep.org

Supporting Sources (27)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Revegetation of water supply catchments following bushfire: A review of the scientific literature relevant to the Lower Cotter catchment - ResearchGate, accessed August 5, 2025,

(PDF) Revegetation of water supply catchments following bushfire: A review of the scientific literature relevant to the Lower Cotter catchment - ResearchGate, accessed August 5, 2025,

Contextual Support GreyLiterature

The effects of forest management on water quality - SLU

Preview of A review of the economics of regenerative agriculture in Western Australia - DPIRD's Digital library, accessed August 4, 2025

A review of the economics of regenerative agriculture in Western Australia - DPIRD's Digital library, accessed August 4, 2025

Contextual Support Journal

A review of the economics of regenerative agriculture in Western Australia - DPIRD's Digital library

Preview of ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia, accessed August 12, 2025

ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia, accessed August 12, 2025

Contextual Support Government

ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia

Preview of Australia's Agricultural Future - Australian Council of Learned Academies, accessed August 5, 2025,

Australia's Agricultural Future - Australian Council of Learned Academies, accessed August 5, 2025,

Contextual Support Journal

Australia's Agricultural Future - Australian Council of Learned Academies, accessed August 5, 2025

Preview of Australian and New Zealand Guidelines for Fresh and Marine Water Quality, accessed August 2, 2025,

Australian and New Zealand Guidelines for Fresh and Marine Water Quality, accessed August 2, 2025,

Contextual Support Direct Evidence

ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia

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

Turbidity | Australia state of the environment 2021

Preview of Clarity and colour - WetlandInfo, accessed August 12, 2025,

Clarity and colour - WetlandInfo, accessed August 12, 2025,

Contextual Support Government

Determining Tipping Points and Responses of Macroinvertebrate Traits to Abiotic Factors in Support of River Management - PMC - PubMed Central

Preview of Cover Crops and Water Quality - ResearchGate, accessed August 5, 2025,

Cover Crops and Water Quality - ResearchGate, accessed August 5, 2025,

Contextual Support Journal

Cover Crops and Water Quality - ResearchGate, accessed August 5, 2025

Preview of Ecosystems | Australia state of the environment 2021, accessed August 5, 2025,

Ecosystems | Australia state of the environment 2021, accessed August 5, 2025,

Contextual Support Government

2025 Guide: Australian Forestry & Sustainable Farming Standards, accessed July 30, 2025

Preview of Environmental problems in Australia | WWF - Panda.org, accessed August 5, 2025,

Environmental problems in Australia | WWF - Panda.org, accessed August 5, 2025,

Contextual Support

Water quality - Healthy Waterways Strategy, accessed August 5, 2025

Preview of Guidelines - Water Quality Australia, accessed August 1, 2025,

Guidelines - Water Quality Australia, accessed August 1, 2025,

Contextual Support

Guidelines - Water Quality Australia, accessed August 10, 2025

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

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

Direct Evidence

Using the ANZECC Guidelines and Water Quality Objectives in NSW

Preview of Nationally Threatened Ecological Communities of the Victorian Volcanic Plain: Natural Temperate Grassland & Grassy Eucalypt Woodland - DCCEEW, accessed August 12, 2025,

Nationally Threatened Ecological Communities of the Victorian Volcanic Plain: Natural Temperate Grassland & Grassy Eucalypt Woodland - DCCEEW, accessed August 12, 2025,

Contextual Support Journal

NSW National Parks and Wildlife Service. (2006). Woodland Remnants and Dryland Salinity: Impacts of dryland salinity on woodland remnants in the Southern Tablelands and South-West Slopes of New South Wales.

Preview of Natural Temperate Grassland of the South Eastern Highlands: a nationally protected ecological community - DCCEEW, accessed August 12, 2025,

Natural Temperate Grassland of the South Eastern Highlands: a nationally protected ecological community - DCCEEW, accessed August 12, 2025,

Contextual Support Journal

Natural Temperate Grassland of the South Eastern ... - DCCEEW

Preview of papers.acg.uwa.edu.au, accessed May 14, 2025,

papers.acg.uwa.edu.au, accessed May 14, 2025,

Contextual Support Journal

papers.acg.uwa.edu.au

Preview of Regenerative Agriculture Case Studies - Soils For Life, accessed August 5, 2025,

Regenerative Agriculture Case Studies - Soils For Life, accessed August 5, 2025,

Contextual Support GreyLiterature

Australia's Agricultural Future - Australian Council of Learned Academies, accessed August 5, 2025

Preview of Regenerative agriculture in Australia: the changing face of farming - Frontiers, accessed August 4, 2025

Regenerative agriculture in Australia: the changing face of farming - Frontiers, accessed August 4, 2025

Contextual Support Journal

Regenerative agriculture is key to dry season preparation - Soils For Life, accessed July 23, 2025

Preview of River Health 2021 | NSW State of the Environment, accessed August 5, 2025,

River Health 2021 | NSW State of the Environment, accessed August 5, 2025,

Contextual Support Government

Assessing Water Quality - Secondary Education Years 9 to 12, accessed August 5, 2025

Preview of Riverine Ecosystem Management: Science for Governing Towards a Sustainable Future - SciSpace, accessed August 5, 2025,

Riverine Ecosystem Management: Science for Governing Towards a Sustainable Future - SciSpace, accessed August 5, 2025,

Contextual Support Journal

ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia, accessed August 5, 2025

Preview of The importance of travelling stock reserves for maintaining high-quality threatened temperate woodlands - CSIRO PUBLISHING | Australian Journal of Botany, accessed August 12, 2025,

The importance of travelling stock reserves for maintaining high-quality threatened temperate woodlands - CSIRO PUBLISHING | Australian Journal of Botany, accessed August 12, 2025,

Contextual Support Journal

Approved Conservation Advice for the White Box - Yellow Box - Blakely's Red Gum Grassy Woodland and Derived Native Grassland - DCCEEW

Preview of The water quality and economic benefits of agricultural management practices, accessed August 5, 2025

The water quality and economic benefits of agricultural management practices, accessed August 5, 2025

Contextual Support Journal

DRINKING WATER QUALITY ANNUAL REPORT 2022-2023 - Alpine Resorts Victoria

Preview of Using the ANZECC Guidelines and Water Quality Objectives in NSW, accessed August 11, 2025,

Using the ANZECC Guidelines and Water Quality Objectives in NSW, accessed August 11, 2025,

Contextual Support Journal

Reference-site data - Water Quality Australia

Preview of Water quality - Healthy Waterways Strategy, accessed August 11, 2025,

Water quality - Healthy Waterways Strategy, accessed August 11, 2025,

Contextual Support Government

Australian guidelines for water quality monitoring and reporting

Preview of Water quality for farm water supplies | Managing dams - Agriculture Victoria, accessed August 1, 2025,

Water quality for farm water supplies | Managing dams - Agriculture Victoria, accessed August 1, 2025,

Direct Evidence Government

Regenerative Agriculture and Livestock Integration on Australian Cattle Farms

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 Objectives - Border Rivers - NSW Government, accessed August 12, 2025

Water Quality Objectives - Border Rivers - NSW Government, accessed August 12, 2025

Contextual Support Government

(PDF) Impact of mitigated forestry activities on turbidity: assessing ...

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,

Contextual Support Government

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

Context

Region Australia
Biome Temperate Grassy Woodlands & Plains
Land Use Agricultural Crop Production
Assessment Not Stated
Evidence Type DegradationThreshold

Lifecycle

Status Active
Version 1
Effective From 1 Jun 2026

Notes

This threshold is based on the ANZECC/ANZG framework and regional data, marking the boundary beyond which turbidity causes significant ecological damage. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

Other benchmarks in the AUS-TGP-AGR-WTU family.