Water Turbidity

AUS-TGP-FOR-WTU General High confidence

Benchmark Value

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

Contributing Benchmarks

OptimalRange Primary MaximumOnly Guard MinimumOnly Guard MaximumOnly Guard Point Guard OptimalRange Guard MaximumOnly Guard MaximumOnly Guard UpperThreshold 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 as a measure of water clarity, quantified by the degree to which light is scattered and absorbed by suspended and dissolved materials in the water column.

Benchmark Definition:

Pre-harvest, low-flow mean turbidity in a selectively logged native Eucalypt forest catchment managed under BMPs, representing a high-health baseline within a production forestry system.

Justification:

Represents the achievable high-health baseline within a production forestry system, not a pristine wilderness.

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 (15)

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

(PDF) Impacts of tree invasion on floristic composition of subtropical grasslands on the Bunya Mountains, Australia - ResearchGate, accessed May 19, 2025

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, accessed August 10, 2025

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, accessed August 10, 2025

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

Report Card 2022-23 - EPA 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

Poplar Box Grassy Woodland on Alluvial Plains: Proposal to list as a nationally protected ecological community - DCCEEW, accessed August 10, 2025

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 Journal

(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, accessed August 10, 2025

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, accessed August 10, 2025

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

Australia's State of the Forests Report 2018 – Criterion 4 - DAFF, accessed March 28, 2026,

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, accessed August 10, 2025

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

Bioregional Assessment: Gippsland Basin - Surface Water Quality

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 ..., accessed August 10, 2025

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 Pristine Reference
  • Evidence Type TargetCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 24 Mar 2026

Notes

Strongly corroborated by data from minimally disturbed reference catchments in Victoria (medians 1.8–2.5 NTU) and within regulatory objectives (< 5 NTU).

Related Benchmarks

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

— NTU High
Production Forestry · Pristine Reference
OptimalRange Active v1
25 NTU High
Production Forestry · Pristine Reference
MaximumOnly Active v1