Water Turbidity

AUS-TSW-FOR-WTU General Moderate confidence

Benchmark Value

25 NTU

Direction: Lower is desirable ↓

Form: MaximumOnly

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 upper detrimental threshold is defined as a sustained mean turbidity > 25 NTU.

Metric Definition:

Upper detrimental threshold for sustained mean turbidity indicating ecological degradation.

Benchmark Definition:

This benchmark marks the upper detrimental threshold for sustained water turbidity in temperate semi-arid woodland catchments, beyond which ecological degradation is indicated and management is considered ineffective.

Justification:

Informed by national guidelines and empirical event data; sustained exceedance signals chronic erosion and degradation.

Sources (2)

Preview of Logging Impacts On Streams - Cloudfront.net

Logging Impacts On Streams - Cloudfront.net Journal

The effects of forest management on water quality - SLU

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

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

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

Supporting Sources (19)

Additional references from the underlying research that informed this benchmark.

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,

Direct Evidence

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

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,

Contextual Support Government

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

Preview of Australia's forests – overview - DAFF, accessed August 5, 2025,

Australia's forests – overview - DAFF, accessed August 5, 2025,

Contextual Support Government

Eastern Australian Temperate Forests | One Earth, accessed April 29, 2025,

Preview of Australia's State of the Forests Report, accessed August 12, 2025

Australia's State of the Forests Report, accessed August 12, 2025

Contextual Support Journal

Change in Organic Carbon in Forest Plantation Soils in Eastern ..., accessed July 20, 2025,

Preview of Australia's Sustainable Forest Management - DAFF, accessed July 12, 2025,

Australia's Sustainable Forest Management - DAFF, accessed July 12, 2025,

Contextual Support

Sustainable forest management: the Australian context - DAFF

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 Regulatory Framework Government

Best Management Practices - National Association of State Foresters

Preview of Deriving guideline values using reference-site data - Water Quality Australia, accessed August 12, 2025

Deriving guideline values using reference-site data - Water Quality Australia, accessed August 12, 2025

Contextual Support Government

Water Quality Guidelines Home - Water Quality Australia

Preview of Dissolved Oxygen (DO) Turbidity - Interstate Commission on the Potomac River Basin, accessed July 12, 2025,

Dissolved Oxygen (DO) Turbidity - Interstate Commission on the Potomac River Basin, accessed July 12, 2025,

Contextual Support Journal

Dissolved Oxygen (DO) Turbidity - Interstate Commission on the Potomac River Basin

Preview of How Sustainable Forestry Works - Science | HowStuffWorks, accessed July 12, 2025,

How Sustainable Forestry Works - Science | HowStuffWorks, accessed July 12, 2025,

Contextual Support GreyLiterature

Australia's Sustainable Forest Management - DAFF, accessed July 12, 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,

Contextual Support Direct Evidence

Using the ANZECC Guidelines and Water Quality Objectives in NSW

Preview of NVIS Fact sheet MVG 13 – Acacia open woodlands - DCCEEW, accessed July 13, 2025,

NVIS Fact sheet MVG 13 – Acacia open woodlands - DCCEEW, accessed July 13, 2025,

Contextual Support Journal

Database - Resilience Alliance, accessed July 30, 2025,

Preview of Protecting waterways - Forestry Corporation, accessed July 12, 2025,

Protecting waterways - Forestry Corporation, accessed July 12, 2025,

Contextual Support Government

Forest Town Nature Conservation Group. (2024). Spa Ponds Water Quality.

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

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

Contextual Support GreyLiterature

The Turbidity Effect on Aquatic Life - Number Analytics, accessed July 31, 2025,

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

Turbidity | River Detectives, accessed July 16, 2025,

Contextual Support Journal

Kosciuszko National Park's health a mixed diagnosis in first EcoHealth Scorecard

Preview of Turbidity and Water | U.S. Geological Survey - USGS.gov, accessed August 12, 2025,

Turbidity and Water | U.S. Geological Survey - USGS.gov, accessed August 12, 2025,

Contextual Support

An Examination of Stream Water Quality Data from Monitoring of ..., accessed July 31, 2025,

Preview of Turbidity, accessed August 3, 2025,

Turbidity, accessed August 3, 2025,

Contextual Support Journal

Dissolved Oxygen (DO) Turbidity - Interstate Commission on the Potomac River Basin, accessed July 12, 2025

Preview of Water Quality and Forestry Best Management Practices, accessed July 12, 2025,

Water Quality and Forestry Best Management Practices, accessed July 12, 2025,

Contextual Support Government

Turbidity | River Detectives, accessed July 12, 2025

Preview of Why Measure Turbidity? - Montclair State University, accessed August 12, 2025,

Why Measure Turbidity? - Montclair State University, accessed August 12, 2025,

Contextual Support GreyLiterature

Why Measure Turbidity? - Montclair State University, accessed July 31, 2025,

Preview of Woodlands of Australia - A biography of the Australian continent, accessed July 12, 2025,

Woodlands of Australia - A biography of the Australian continent, accessed July 12, 2025,

Contextual Support GreyLiterature

Australia's forests – overview - DAFF, accessed July 12, 2025

Context

Region Australia
Biome Temperate Semi-Arid Shrublands & Open Woodlands
Land Use Production Forestry
Assessment Not Stated
Evidence Type DegradationThreshold

Lifecycle

Status Active
Version 2
Effective From 1 Jun 2026

Notes

Short-term spikes above 25 NTU may occur, but persistent means above this level indicate degraded state. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

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