Water Turbidity

AUS-TGP-FOR-WTU General Moderate confidence

Benchmark Value

3.3 NTU
Direction: Lower is desirable ↓
Form: Point

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 11 benchmarks together — the OptimalRange form drives the primary score, while 10 guard(s) constrain the result.

Contributing Benchmarks

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

Evidence & Context

The critical finding of this study for establishing a benchmark is the pre-harvest, low-flow mean turbidity level in the catchment designated for harvesting. This value was measured at 3.3 NTU.

Metric Definition:

Water turbidity is a fundamental measure of water clarity, or conversely, its murkiness, quantifying the degree to which light is scattered and absorbed by suspended and dissolved materials in the water column.

Benchmark Definition:

This benchmark represents the pre-harvest, low-flow mean turbidity level in a production forestry catchment within the Temperate Grassy Woodlands & Plains biome in Australia, indicating achievable water clarity under best-practice management.

Justification:

This value represents the achievable water quality baseline within the specified land use context of a production forest managed under best-practice BMPs.

Sources (1)

Preview of (PDF) Impact of mitigated forestry activities on turbidity: assessing ..., accessed July 12, 2025,
(PDF) Impact of mitigated forestry activities on turbidity: assessing ..., accessed July 12, 2025,

(PDF) Impact of mitigated forestry activities on turbidity: assessing ..., accessed July 12, 2025,

View Source

Supporting Sources (16)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Determining reference conditions for management and ..., accessed August 5, 2025,
(PDF) Determining reference conditions for management and ..., accessed August 5, 2025,
Contextual Support Journal

Effects of Stock Grazing on Biodiversity Values in Temperate Native Grasslands and Grassy Woodlands in SE Australia: A Literature Review - ACT Government

View Source
Preview of Best Management Practices - National Association of State Foresters, accessed July 12, 2025,
Best Management Practices - National Association of State Foresters, accessed July 12, 2025,
Contextual Support Government

Best Management Practices - National Association of State Foresters

View Source
Preview of Canadian Water Quality Guidelines for the Protection of Aquatic Life - Total Particulate Matter - CCME, accessed August 10, 2025
Canadian Water Quality Guidelines for the Protection of Aquatic Life - Total Particulate Matter - CCME, accessed August 10, 2025
Contextual Support Journal

Canadian Water Quality Guidelines for the Protection of Aquatic Life - Total Particulate Matter - CCME

View Source
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

View Source
Preview of Criteria and Indicators for Sustainable Forest Management in Victoria
Criteria and Indicators for Sustainable Forest Management in Victoria
Contextual Support Journal

Criteria and Indicators for Sustainable Forest Management in Victoria

View Source
Preview of Ecosystems | Australia state of the environment 2021, accessed August 10, 2025
Ecosystems | Australia state of the environment 2021, accessed August 10, 2025
Contextual Support Journal

Natural Temperate Grassland of the South Eastern Highlands: a nationally protected ecological community - DCCEEW

View Source
Preview of Identifying ecological barriers to restoration in temperate grassy woodlands: soil changes associated with different degradation states - ResearchGate, accessed August 5, 2025,
Identifying ecological barriers to restoration in temperate grassy woodlands: soil changes associated with different degradation states - ResearchGate, accessed August 5, 2025,
Contextual Support GreyLiterature

(PDF) Identifying ecological barriers to restoration in temperate grassy woodlands: soil changes associated with different degradation states - ResearchGate, accessed August 4, 2025,

View Source
Preview of Improved forest management - CSIRO, accessed July 12, 2025,
Improved forest management - CSIRO, accessed July 12, 2025,
Contextual Support Government

Ecosystem wicks: Woodland trees enhance water infiltration in a fragmented agricultural landscape in eastern Australia, accessed May 15, 2025,

View Source
Preview of Logging Impacts On Streams - Cloudfront.net
Logging Impacts On Streams - Cloudfront.net
Contextual Support Journal

The effects of forest management on water quality - SLU

View Source
Preview of TB966 Compendium of Forestry Best Management Practices for Controlling Nonpoint Source Pollution in North America - NCASI
TB966 Compendium of Forestry Best Management Practices for Controlling Nonpoint Source Pollution in North America - NCASI
Contextual Support Journal

New York State Forestry Best Management Practices for Water Quality Field Guide

View Source
Preview of The effects of forest management on water quality - SLU, accessed July 20, 2025
The effects of forest management on water quality - SLU, accessed July 20, 2025
Contextual Support Journal

SA Arid Lands Landscape Regional Summary 2022 Aquatic Ecosystem Condition Report, accessed July 31, 2025,

View Source
Preview of Victorian Government Department of Sustainability and Environment. (2003). Victoria's Criteria and Indicators for Sustainable Forest Management.
Victorian Government Department of Sustainability and Environment. (2003). Victoria's Criteria and Indicators for Sustainable Forest Management.
Direct Evidence Journal

1.1.5.2 Surface water quality | Bioregional Assessments

View Source
Preview of Water clarity around Australia – satellite and in situ observations 3.1 - IMOS Ocean Report, accessed August 10, 2025
Water clarity around Australia – satellite and in situ observations 3.1 - IMOS Ocean Report, accessed August 10, 2025
Contextual Support Journal

Water clarity around Australia – satellite and in situ observations 3.1 - IMOS Ocean Report

View Source
Preview of Water Quality Objectives - Border Rivers - NSW Government
Water Quality Objectives - Border Rivers - NSW Government
Contextual Support Government

Water Quality Objectives - Border Rivers - NSW Government

View Source
Preview of Water Quality Objectives - Border Rivers - NSW Government, accessed August 12, 2025
Water Quality Objectives - Border Rivers - NSW Government, accessed August 12, 2025
Direct Evidence Government

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

View Source
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 ...

View Source

Context

  • Region Australia
  • Biome Temperate Grassy Woodlands & Plains
  • Land Use Production Forestry
  • Assessment Not Stated
  • Evidence Type ReferenceCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 9 Jun 2026

Notes

No upper detrimental threshold — higher turbidity values indicate worse water quality. This value reflects a high-health baseline within a production forestry system, corroborated by minimally disturbed reference catchments and regulatory objectives. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

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

— NTU High
Production Forestry · Not Stated
OptimalRange Active v1
25 NTU Moderate
Production Forestry · Not Stated
MaximumOnly Active v1