Water Turbidity

AUS-TSR-FOR-WTU General Moderate confidence

Benchmark Value

No specific value — see range

Range: 2 to 4 NTU

Thresholds: Lower: —, Upper: 15

Optimal Range: 2 to 4

Direction: Higher 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 MinimumOnly Guard MaximumOnly Guard Point Guard OptimalRange Guard MaximumOnly Guard MaximumOnly Guard UpperThreshold Guard

Evidence & Context

The reference value represents the median (T50) to 90th percentile (T90) range of turbidity observed across 61 long-term monitoring sites in coastal GBR waters.

Metric Definition:

Water turbidity in streams within or downstream of production forestry operations managed to a high standard of environmental health in Australia's Tropical and Subtropical Rainforests.

Benchmark Definition:

This benchmark represents the typical range of water turbidity in streams influenced by best-practice production forestry in Australia's Tropical & Subtropical Rainforests, based on reference conditions from least-disturbed coastal catchments.

Justification:

The benchmark is derived from a proxy (least-disturbed catchments) rather than direct monitoring within certified best-practice production forestry catchments, but the approach is scientifically sound and supported by comprehensive data and government assessments.

Sources (1)

Preview of Aquatic Conservation Assessments (ACA), - WetlandInfo, accessed July 20, 2025,

Aquatic Conservation Assessments (ACA), - WetlandInfo, accessed July 20, 2025, Journal

Aquatic Conservation Assessments (ACA), - WetlandInfo, accessed July 20, 2025,

Supporting Sources (34)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Cautions on using the Before-After-Control-Impact design in environmental effects monitoring programs - ResearchGate, accessed July 20, 2025,

(PDF) Cautions on using the Before-After-Control-Impact design in environmental effects monitoring programs - ResearchGate, accessed July 20, 2025,

Methodology Source Journal

(PDF) Cautions on using the Before-After-Control-Impact design in environmental effects monitoring programs - ResearchGate, accessed July 20, 2025,

Preview of (PDF) Marine Monitoring Program: Annual Report for Inshore Water Quality Monitoring 2022-23 - ResearchGate, accessed July 20, 2025,

(PDF) Marine Monitoring Program: Annual Report for Inshore Water Quality Monitoring 2022-23 - ResearchGate, accessed July 20, 2025,

Contextual Support GreyLiterature

Gruber, R., et al. (2024). Marine Monitoring Program: Annual Report for Inshore Water Quality Monitoring 2022-23. Great Barrier Reef Marine Park Authority. 18

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

(PDF) Revegetation of water supply catchments following bushfire: A review of the scientific literature relevant to the Lower Cotter catchment - ResearchGate, accessed July 20, 2025,

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 (PDF) Waterhouse, J. and Devlin, M. (Compilers) (2011) Managing Water Quality on the Great Barrier Reef: An Overview of MTSRF Research Outputs, 2006-2010. Synthesis Report prepared for the Marine and Tropical Sciences Research Facility (MTSRF). - ResearchGate, accessed July 20, 2025,

(PDF) Waterhouse, J. and Devlin, M. (Compilers) (2011) Managing Water Quality on the Great Barrier Reef: An Overview of MTSRF Research Outputs, 2006-2010. Synthesis Report prepared for the Marine and Tropical Sciences Research Facility (MTSRF). - ResearchGate, accessed July 20, 2025,

Contextual Support

(PDF) Waterhouse, J. and Devlin, M. (Compilers) (2011) Managing Water Quality on the Great Barrier Reef: An Overview of MTSRF Research Outputs, 2006-2010. Synthesis Report prepared for the Marine and Tropical Sciences Research Facility (MTSRF). - ResearchGate, accessed July 20, 2025,

Preview of 2019-20 water quality data report - Seqwater, accessed July 20, 2025,

2019-20 water quality data report - Seqwater, accessed July 20, 2025,

Contextual Support Journal

2019-20 water quality data report - Seqwater, accessed July 20, 2025,

Preview of A review of paired catchment studies for determining changes in water yield resulting from alterations in vegetation - lerf/esalq/usp

A review of paired catchment studies for determining changes in water yield resulting from alterations in vegetation - lerf/esalq/usp

Contextual Support Journal

A review of paired catchment studies for determining changes in water yield resulting from alterations in vegetation - lerf/esalq/usp

Preview of Australia's State of the Forests Report 2018 13 Criterion 4 - DAFF, accessed August 1, 2025,

Australia's State of the Forests Report 2018 13 Criterion 4 - DAFF, accessed August 1, 2025,

Contextual Support Journal

Victoria's State of the Forests Report 2013, accessed March 28, 2026,

Preview of Australian Paired Catchment Studies: The Rise and Fall of a Forest Hydrology Work Horse?, accessed July 20, 2025,

Australian Paired Catchment Studies: The Rise and Fall of a Forest Hydrology Work Horse?, accessed July 20, 2025,

Contextual Support GreyLiterature

Australian Paired Catchment Studies: The Rise and Fall of a Forest Hydrology Work Horse?, accessed July 20, 2025,

Preview of Bird diversity increases after patchy prescribed fire: implications from a before–after control–impact study - CSIRO Publishing, accessed July 20, 2025,

Bird diversity increases after patchy prescribed fire: implications from a before–after control–impact study - CSIRO Publishing, accessed July 20, 2025,

Contextual Support Journal

Bird diversity increases after patchy prescribed fire: implications from a before–after control–impact study - CSIRO Publishing, accessed July 20, 2025,

Preview of Brodie, J., Pearson, R., Lewis, S., Bainbridge, Z., Waterhouse, J. and Prange, J. (2009) Water Quality Research: Baseline Synthesis and Year 1 Summary - ResearchOnline@JCU - James Cook University, accessed July 20, 2025,

Brodie, J., Pearson, R., Lewis, S., Bainbridge, Z., Waterhouse, J. and Prange, J. (2009) Water Quality Research: Baseline Synthesis and Year 1 Summary - ResearchOnline@JCU - James Cook University, accessed July 20, 2025,

Contextual Support Journal

Public Environmental Report Blackmore River (East ... - NT EPA, accessed July 24, 2025

Preview of Cautions on using the Before-After-Control-Impact design in environmental effects monitoring programs - Facets Journal, accessed July 20, 2025,

Cautions on using the Before-After-Control-Impact design in environmental effects monitoring programs - Facets Journal, accessed July 20, 2025,

Methodology Source Journal

Cautions on using the Before-After-Control-Impact design in environmental effects monitoring programs - Facets Journal, accessed July 20, 2025,

Preview of Chapter 2: Water Quality and Forestry Activities - Environmental Protection Agency (EPA), accessed July 20, 2025,

Chapter 2: Water Quality and Forestry Activities - Environmental Protection Agency (EPA), accessed July 20, 2025,

Contextual Support Journal

Chapter 2: Water Quality and Forestry Activities - Environmental Protection Agency (EPA), accessed August 10, 2025

Preview of Environment | HQPlantations, accessed July 20, 2025,

Environment | HQPlantations, accessed July 20, 2025,

Contextual Support GreyLiterature

Environment | HQPlantations, accessed July 20, 2025,

Preview of Identification of priority pollutants and priority areas in the Great Barrier Reef catchments - Reef & Rainforest Research Centre, accessed July 20, 2025,

Identification of priority pollutants and priority areas in the Great Barrier Reef catchments - Reef & Rainforest Research Centre, accessed July 20, 2025,

Contextual Support Journal

Gully erosion prediction across a large region: Murray–Darling Basin, Australia, accessed July 19, 2025

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,

Preview of Managing forest operations to protect the water environment - Forest Research, accessed July 20, 2025,

Managing forest operations to protect the water environment - Forest Research, accessed July 20, 2025,

Contextual Support Government

Managing forest operations to protect the water environment - Forest Research, accessed July 20, 2025,

Preview of Nitrogen levels in the Tully River - A long-term view | Request PDF - ResearchGate, accessed July 20, 2025,

Nitrogen levels in the Tully River - A long-term view | Request PDF - ResearchGate, accessed July 20, 2025,

Contextual Support Journal

Nitrogen levels in the Tully River - A long-term view | Request PDF - ResearchGate, accessed July 20, 2025,

Preview of Published on DAF Disclosure Log RTI Act 2009 - Department of ..., accessed July 20, 2025,

Published on DAF Disclosure Log RTI Act 2009 - Department of ..., accessed July 20, 2025,

Contextual Support Journal

Macdonald, Rachael K. (2015) Turbidity and light attenuation in ..., accessed July 20, 2025,

Preview of Review of the current state of knowledge for the monitoring of forestry impacts on waterway health in NSW coastal forests - Natural Resources Commission, accessed August 9, 2025

Review of the current state of knowledge for the monitoring of forestry impacts on waterway health in NSW coastal forests - Natural Resources Commission, accessed August 9, 2025

Contextual Support Journal

Potential effects of climate change on forests and forestry in Australia

Preview of Safe Havens Protected Areas for Disaster Risk Reduction and Climate Change Adaptation - Global Mangrove Alliance, accessed July 20, 2025,

Safe Havens Protected Areas for Disaster Risk Reduction and Climate Change Adaptation - Global Mangrove Alliance, accessed July 20, 2025,

Contextual Support

Safe Havens Protected Areas for Disaster Risk Reduction and Climate Change Adaptation - Global Mangrove Alliance, accessed July 20, 2025,

Preview of sourced pollutants and their impacts on water quality in and adjacent to the great barrier reef, accessed July 20, 2025,

sourced pollutants and their impacts on water quality in and adjacent to the great barrier reef, accessed July 20, 2025,

Contextual Support Journal

sourced pollutants and their impacts on water quality in and adjacent to the great barrier reef, accessed July 20, 2025,

Preview of South Galilee Coal project – EIS – Appendix O - Aquatic ecology technical report, accessed July 20, 2025,

South Galilee Coal project – EIS – Appendix O - Aquatic ecology technical report, accessed July 20, 2025,

Contextual Support Journal

South Galilee Coal project – EIS – Appendix O - Aquatic ecology technical report, accessed July 20, 2025,

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,

Preview of Turbidity | River Detectives, accessed July 16, 2025,

Turbidity | River Detectives, accessed July 16, 2025,

Contextual Support Journal

Turbidity | River Detectives, accessed July 27, 2025,

Preview of Using monitoring data to derive and assess against guideline values, accessed July 20, 2025,

Using monitoring data to derive and assess against guideline values, accessed July 20, 2025,

Methodology Source Government

Using monitoring data to derive and assess against guideline values, accessed July 13, 2025,

Preview of Water quality - Department of Primary Industries, Queensland, accessed July 20, 2025,

Water quality - Department of Primary Industries, Queensland, accessed July 20, 2025,

Regulatory Framework Government

Water quality - Department of Primary Industries, Queensland, accessed July 20, 2025,

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

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

Regulatory Framework Government

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

Preview of Water Quality, River Discharge and Remote Sense Database - Research Data Australia, accessed July 20, 2025,

Water Quality, River Discharge and Remote Sense Database - Research Data Australia, accessed July 20, 2025,

Contextual Support Government

Water Quality, River Discharge and Remote Sense Database - Research Data Australia, accessed July 20, 2025,

Preview of Water Quality, River Discharge and Remote Sense Database - Research Data JCU, accessed July 20, 2025,

Water Quality, River Discharge and Remote Sense Database - Research Data JCU, accessed July 20, 2025,

Contextual Support Government

Water Quality, River Discharge and Remote Sense Database - Research Data JCU, accessed July 20, 2025,

Preview of Water Quality, River Discharge and Remote Sensing Data Base, accessed July 20, 2025,

Water Quality, River Discharge and Remote Sensing Data Base, accessed July 20, 2025,

Contextual Support Government

Water Quality, River Discharge and Remote Sensing Data Base, accessed July 20, 2025,

Preview of Water Quantity and Quality - Southern Research Station, accessed July 20, 2025,

Water Quantity and Quality - Southern Research Station, accessed July 20, 2025,

Contextual Support Journal

Water Quantity and Quality - Southern Research Station, accessed July 20, 2025,

Preview of Water resource assessment for the Southern Gulf catchments - CSIRO, accessed July 20, 2025,

Water resource assessment for the Southern Gulf catchments - CSIRO, accessed July 20, 2025,

Contextual Support Journal

Water resource assessment for the Southern Gulf catchments - CSIRO, accessed July 20, 2025,

Preview of WATER RESOURCES & MANAGEMENT, accessed July 20, 2025,

WATER RESOURCES & MANAGEMENT, accessed July 20, 2025,

Contextual Support Journal

WATER RESOURCES & MANAGEMENT, accessed July 20, 2025,

Context

Region Australia
Biome Tropical & Subtropical Rainforests
Land Use Production Forestry
Assessment Pristine Reference
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 15 Mar 2026

Notes

Lower values approaching 1-2 NTU indicate excellent, near-natural conditions. Sustained turbidity above 15-20 NTU indicates degraded conditions. The optimal turbidity range to maintain ecological integrity is a median turbidity below 5 NTU, consistent with Australian Drinking Water guidelines. RangeFixup applied 2026-03-21 22:21 UTC: OptimalRangeHigh: 5 → 4; UpperBound: 4 → 5 [Migration] Original wider evidence range: 2 – 5 (retained OptimalRange: 2 – 4)