Water Turbidity

AUS-TMS-AQU-WTU General Moderate confidence

Benchmark Value

5 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 15 benchmarks together — the OptimalRange form drives the primary score, while 14 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary MaximumOnly Guard OptimalRange Guard Point Guard MaximumOnly Guard MaximumOnly Guard MaximumOnly Guard MaximumOnly Guard OptimalRange Guard MaximumOnly Guard Point Guard LowerThreshold Guard OptimalRange Guard MaximumOnly Guard MaximumOnly Guard

Evidence & Context

The optimal range for maintaining high ecological health in the receiving waters is determined to be <5 NTU. This is based on the synthesis of the '<4 NTU' benchmark for 'very good' health and the upper detrimental threshold.

Metric Definition:

Water turbidity measured as Nephelometric Turbidity Units (NTU) representing the optimal range for ecological health in aquaculture receiving waters.

Benchmark Definition:

This benchmark represents the maximum turbidity level of 5 NTU as the upper limit of the optimal range for maintaining high ecological health in aquaculture receiving waters.

Justification:

Synthesized from the benchmark for very good health (<4 NTU) and the upper detrimental threshold (5 NTU) to define a functional range.

Sources (2)

Preview of "Water Quality Objectives for the Darwin Harbour Region" (NT DEPWS 2020)

"Water Quality Objectives for the Darwin Harbour Region" (NT DEPWS 2020) Journal

Darwin Harbour water quality report 2020 | Department of Lands, Planning and Environment

Preview of Turbidity Measurement Methods - In-Situ

Turbidity Measurement Methods - In-Situ GreyLiterature

Determining Tipping Points and Responses of Macroinvertebrate ...

Supporting Sources (33)

Additional references from the underlying research that informed this benchmark.

Preview of 23rd October 2012. Mr David Borthwick AO PSM The Department Agriculture Fisheries Forestry SUBMISSION – Review of Commonwealth - DAFF

23rd October 2012. Mr David Borthwick AO PSM The Department Agriculture Fisheries Forestry SUBMISSION – Review of Commonwealth - DAFF

Contextual Support Journal

23rd October 2012. Mr David Borthwick AO PSM The Department Agriculture Fisheries Forestry SUBMISSION – Review of Commonwealth - DAFF

Preview of 3.1. Water clarity around Australia – IMOS Ocean Report

3.1. Water clarity around Australia – IMOS Ocean Report

Contextual Support Government

Dynamics of the turbidity maximum in King Sound, tropical Western Australia | Request PDF

Preview of A review of water quality studies relevant to northern Australia - CSIRO, accessed July 21, 2025,

A review of water quality studies relevant to northern Australia - CSIRO, accessed July 21, 2025,

Contextual Support Journal

Salinity and water quality

Preview of A Water Quality Protection Plan for Darwin Harbour region - MSSANZ

A Water Quality Protection Plan for Darwin Harbour region - MSSANZ

Direct Evidence Journal

A Water Quality Protection Plan for Darwin Harbour region - MSSANZ

Preview of ad-a271 059 - distribution of turbidity in australian tropical waters - DTIC

ad-a271 059 - distribution of turbidity in australian tropical waters - DTIC

Contextual Support

STUDIES ON TURBIDITY IN RELATION TO SUSPENDED SOLID, VELOCITY, TEMPERATURE, PH, CONDUCTIVITY, COLOUR AND TIME

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

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

Regulatory Framework Government

ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia

Preview of Aquaculture | Department of Agriculture and Fisheries

Aquaculture | Department of Agriculture and Fisheries

Contextual Support Government

Aquaculture | Department of Agriculture and Fisheries

Preview of Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000), accessed May 11, 2025,

Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000), accessed May 11, 2025,

Regulatory Framework Journal

Northern Territory Government (2020) Darwin Harbour Region Water Quality Objectives, Report Card Section 3.0.

Preview of Australian prawn farming manual Part 4-9.pdf

Australian prawn farming manual Part 4-9.pdf

Contextual Support

Effects of suspended solids in shrimp biofloc systems - Responsible Seafood Advocate, accessed July 21, 2025,

Preview of BAS-210 0023 Darwin Pipeline Duplication (DPD) Project – Trenching and Spoil Disposal Management and Monitoring Plan (TSDMMP) - Santos

BAS-210 0023 Darwin Pipeline Duplication (DPD) Project – Trenching and Spoil Disposal Management and Monitoring Plan (TSDMMP) - Santos

Contextual Support Journal

BAS-210 0023 Darwin Pipeline Duplication (DPD) Project – Trenching and Spoil Disposal Management and Monitoring Plan (TSDMMP) - Santos

Preview of Case study: Humpty Doo Barramundi - The Territory, Australia

Case study: Humpty Doo Barramundi - The Territory, Australia

Contextual Support GreyLiterature

Case study: Humpty Doo Barramundi - The Territory, Australia

Preview of Chapter 9 – Marine Environmental Quality | NTEPA

Chapter 9 – Marine Environmental Quality | NTEPA

Contextual Support Journal

Australian prawn farming manual Part 4-9.pdf

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 Darwin Harbour water quality | AIMS - The Australian Institute of Marine Science

Darwin Harbour water quality | AIMS - The Australian Institute of Marine Science

Contextual Support Government

Darwin Harbour water quality | AIMS - The Australian Institute of Marine Science

Preview of Darwin Harbour water quality report 2020 | Department of Lands, Planning and Environment

Darwin Harbour water quality report 2020 | Department of Lands, Planning and Environment

Contextual Support Government

Darwin Harbour water quality report 2021 | Department of Lands ...

Preview of Determining Tipping Points and Responses of Macroinvertebrate Traits to Abiotic Factors in Support of River Management - PubMed Central, accessed July 16, 2025,

Determining Tipping Points and Responses of Macroinvertebrate Traits to Abiotic Factors in Support of River Management - PubMed Central, accessed July 16, 2025,

Direct Evidence Journal

Determining Tipping Points and Responses of Macroinvertebrate Traits to Abiotic Factors in Support of River Management. Water, 15(8), 1589.

Preview of Development of regional water quality and catchment guidelines for the conservation of aquatic ecosystems - NSW Environment Protection Authority, accessed July 30, 2025,

Development of regional water quality and catchment guidelines for the conservation of aquatic ecosystems - NSW Environment Protection Authority, accessed July 30, 2025,

Regulatory Framework Journal

Queensland Water Quality Guidelines 2009

Preview of Dynamics of the turbidity maximum in King Sound, tropical Western Australia | Request PDF

Dynamics of the turbidity maximum in King Sound, tropical Western Australia | Request PDF

Contextual Support Journal

Dynamics of the turbidity maximum in King Sound, tropical Western Australia | Request PDF

Preview of Impacts of water resource development on tropical flow-dependent fisheries - CDU Research Webportal

Impacts of water resource development on tropical flow-dependent fisheries - CDU Research Webportal

Contextual Support

3.1. Water clarity around Australia – IMOS Ocean Report

Preview of Kurnell Wharf Infrastructure Upgrade - Sediment and Water Quality Monitoring Program - Ampol

Kurnell Wharf Infrastructure Upgrade - Sediment and Water Quality Monitoring Program - Ampol

Contextual Support

Using the ANZECC Guidelines and Water Quality Objectives in NSW

Preview of Long-term spatial variations in turbidity and temperature provide new insights into coral-algal states on extreme/marginal reefs - ResearchOnline@JCU, accessed August 2, 2025,

Long-term spatial variations in turbidity and temperature provide new insights into coral-algal states on extreme/marginal reefs - ResearchOnline@JCU, accessed August 2, 2025,

Contextual Support Journal

Impacts of water resource development on tropical flow-dependent fisheries - CDU Research Webportal

Preview of Measuring High Levels of Total Suspended Solids and Turbidity Using Small Unoccupied Aerial Systems (sUAS) Multispectral Imagery - MDPI

Measuring High Levels of Total Suspended Solids and Turbidity Using Small Unoccupied Aerial Systems (sUAS) Multispectral Imagery - MDPI

Methodology Source Journal

Measuring High Levels of Total Suspended Solids and Turbidity Using Small Unoccupied Aerial Systems (sUAS) Multispectral Imagery - MDPI

Preview of National Aquaculture Statement

National Aquaculture Statement

Contextual Support Journal

Public Environmental Report Blackmore River (East) Aquaculture Development March 2001 for Phelps/Panizza Holdings Page 100 - NT EPA - Northern Territory Government

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,

Regulatory Framework

Using the ANZECC Guidelines and Water Quality Objectives in NSW

Preview of NSW Marine Waters Sustainable Aquaculture Strategy

NSW Marine Waters Sustainable Aquaculture Strategy

Contextual Support Journal

National Aquaculture Statement

Preview of Public Environmental Report Blackmore River (East) Aquaculture Development March 2001 for Phelps/Panizza Holdings Page 100 - NT EPA - Northern Territory Government

Public Environmental Report Blackmore River (East) Aquaculture Development March 2001 for Phelps/Panizza Holdings Page 100 - NT EPA - Northern Territory Government

Contextual Support Journal

Case study: Humpty Doo Barramundi - The Territory, Australia

Preview of Queensland Aquaculture Strategy 2024–2034

Queensland Aquaculture Strategy 2024–2034

Contextual Support Journal

NSW Marine Waters Sustainable Aquaculture Strategy

Preview of Queensland Water Quality Guidelines 2009, accessed July 21, 2025,

Queensland Water Quality Guidelines 2009, accessed July 21, 2025,

Regulatory Framework Journal

Queensland Aquaculture Strategy 2024–2034

Preview of Review of Nutrient Release from Aquaculture ... - Griffith University, accessed August 1, 2025

Review of Nutrient Release from Aquaculture ... - Griffith University, accessed August 1, 2025

Contextual Support Journal

Review of Nutrient Release from Aquaculture Activities Final Report - Griffith University

Preview of STUDIES ON TURBIDITY IN RELATION TO SUSPENDED SOLID, VELOCITY, TEMPERATURE, PH, CONDUCTIVITY, COLOUR AND TIME

STUDIES ON TURBIDITY IN RELATION TO SUSPENDED SOLID, VELOCITY, TEMPERATURE, PH, CONDUCTIVITY, COLOUR AND TIME

Contextual Support Journal

National Guidelines for Water Quality - Department of Natural Resources and Environment Tasmania

Preview of Understanding the Influence of Suspended Solids on Water Quality and Aquatic Biota | Request PDF - ResearchGate

Understanding the Influence of Suspended Solids on Water Quality and Aquatic Biota | Request PDF - ResearchGate

Contextual Support Journal

Water Pollution and the Reef Protection Regulations - Q&A

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,

Regulatory Framework Journal

Reference-site data - Water Quality Australia

Preview of Water Pollution and the Reef Protection Regulations - Q&A

Water Pollution and the Reef Protection Regulations - Q&A

Regulatory Framework GreyLiterature

Water Pollution and the Reef Protection Regulations - Q&A

Context

Region Australia
Biome Tropical Monsoonal Savannas
Land Use Aquaculture
Assessment Not Stated
Evidence Type HealthyOperationalRange

Lifecycle

Status Active
Version 2
Effective From 1 Jun 2026

Notes

Values below 5 NTU represent the target range to avoid negative ecological consequences in tropical monsoonal estuarine environments. AssessmentContext defaulted to 'Not Stated' because the source document did not state one. Pipeline quarantine: Lower confidence than existing active benchmark v1 (High). Accepted by operator on 2026-06-01 21:16 UTC — superseded v2 (#1209)

Related Benchmarks

Other benchmarks in the AUS-TMS-AQU-WTU family.