Water Turbidity

AUS-AIF-URB-WTU General Low 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 13 benchmarks together — the OptimalRange form drives the primary score, while 12 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary MaximumOnly Guard MaximumOnly Guard MaximumOnly Guard MaximumOnly Guard Point Guard OptimalRange Guard MaximumOnly Guard MaximumOnly Guard MinimumOnly Guard MaximumOnly Guard MaximumOnly Guard MaximumOnly Guard

Evidence & Context

a chronic state of very low turbidity (e.g., < 5 NTU), a level significantly clearer than what is achieved even by natural soil filtration, could be considered a point where unintended ecological consequences might arise.

Metric Definition:

Lower critical turbidity threshold below which ecological disruption may occur

Benchmark Definition:

Lower critical turbidity threshold below which ecological harm may occur due to unnatural clarity.

Justification:

Ecological principles suggest that artificially high clarity below 5 NTU may disrupt native fauna adapted to turbid conditions.

Sources (1)

Preview of FLOODPLAIN WETLANDS AND WATERBIRDS OF THE CHANNEL COUNTRY - Department for Environment and Water, accessed July 21, 2025,

FLOODPLAIN WETLANDS AND WATERBIRDS OF THE CHANNEL COUNTRY - Department for Environment and Water, accessed July 21, 2025, Journal

Ecological roles and threats to aquatic refugia in arid landscapes: dryland river waterholes

Supporting Sources (23)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Water quality in two Australian dryland rivers: spatial and temporal variability and the role of flow - ResearchGate, accessed July 30, 2025,

(PDF) Water quality in two Australian dryland rivers: spatial and temporal variability and the role of flow - ResearchGate, accessed July 30, 2025,

Direct Evidence

(PDF) Effects of increasing salinity on freshwater ecosystems in Australia - ResearchGate

Preview of (PDF) Water Sensitive Urban Design - Case Studies (Australia/Dubai) - ResearchGate, accessed July 13, 2025,

(PDF) Water Sensitive Urban Design - Case Studies (Australia/Dubai) - ResearchGate, accessed July 13, 2025,

Contextual Support GreyLiterature

WATER- SENSITIVE URBAN DESIGN AND PLANNING - Centre for Science and Environment

Preview of Alice Springs water assessment report - Territory Stories

Alice Springs water assessment report - Territory Stories

Contextual Support Government

Alice Springs water assessment report - Territory Stories

Preview of Alice Springs water assessment report - Territory Stories, accessed July 21, 2025,

Alice Springs water assessment report - Territory Stories, accessed July 21, 2025,

Contextual Support Government

Synthesis of ANZECC (2000) Guidelines and regional data from the Alice Springs Water Assessment Report (NT DPL, 2025)

Preview of Arid springs: the hidden evolutionary cradles of Outback Australia - CSIRO

Arid springs: the hidden evolutionary cradles of Outback Australia - CSIRO

Contextual Support Government

Arid springs: the hidden evolutionary cradles of Outback Australia - CSIRO

Preview of Assessing the Impact of Recycled Water Quality and Clogging on Infiltration Rates at A Pioneering Soil Aquifer Treatment (SAT) Site in Alice Springs, Northern Territory (NT), Australia - MDPI, accessed July 21, 2025,

Assessing the Impact of Recycled Water Quality and Clogging on Infiltration Rates at A Pioneering Soil Aquifer Treatment (SAT) Site in Alice Springs, Northern Territory (NT), Australia - MDPI, accessed July 21, 2025,

Contextual Support Journal

Alice Springs water assessment report - Territory Stories, accessed August 1, 2025,

Preview of Community Acceptance of Water Sensitive Urban Design: Six Case ..., accessed July 21, 2025,

Community Acceptance of Water Sensitive Urban Design: Six Case ..., accessed July 21, 2025,

Contextual Support Journal

Community Acceptance of Water Sensitive Urban Design: Six Case ..., accessed July 21, 2025,

Preview of Ecological roles and threats to aquatic refugia in arid landscapes: dryland river waterholes, accessed July 20, 2025

Ecological roles and threats to aquatic refugia in arid landscapes: dryland river waterholes, accessed July 20, 2025

Contextual Support Journal

Australia's forests - DAFF

Preview of Effects of common carp on water quality and submerged vegetation: results from a short-term mesocosm experiment in an artificial wetland - CSIRO Publishing, accessed July 16, 2025,

Effects of common carp on water quality and submerged vegetation: results from a short-term mesocosm experiment in an artificial wetland - CSIRO Publishing, accessed July 16, 2025,

Contextual Support Journal

Effects of common carp on water quality and submerged vegetation: results from a short-term mesocosm experiment in an artificial wetland - CSIRO Publishing

Preview of Floods Give Way to a Burst of Desert Life - NASA Earth Observatory, accessed July 21, 2025,

Floods Give Way to a Burst of Desert Life - NASA Earth Observatory, accessed July 21, 2025,

Contextual Support Government

Floods Give Way to a Burst of Desert Life - NASA Earth Observatory

Preview of Guidance document for assessing and managing water quality in temporary waters, accessed July 16, 2025,

Guidance document for assessing and managing water quality in temporary waters, accessed July 16, 2025,

Direct Evidence Journal

Guidance document for assessing and managing water quality in temporary waters, accessed July 10, 2025,

Preview of Impacts of carp in wetlands - Water and catchments, accessed July 21, 2025,

Impacts of carp in wetlands - Water and catchments, accessed July 21, 2025,

Contextual Support Journal

Macrophytes and macroalgae in the Swan-Canning estuary

Preview of Lake Eyre - Wikipedia, accessed July 21, 2025,

Lake Eyre - Wikipedia, accessed July 21, 2025,

Contextual Support GreyLiterature

Lake Eyre basin - Wikipedia

Preview of Lake Eyre Basin - Goyder Institute for Water Research, accessed July 21, 2025,

Lake Eyre Basin - Goyder Institute for Water Research, accessed July 21, 2025,

Contextual Support GreyLiterature

Lake Eyre Basin - Goyder Institute for Water Research, accessed July 21, 2025,

Preview of Lake Eyre Basin: its rivers and catchments. Strategic Plan. - DCCEEW, accessed July 21, 2025,

Lake Eyre Basin: its rivers and catchments. Strategic Plan. - DCCEEW, accessed July 21, 2025,

Contextual Support Journal

Lake Eyre Basin: its rivers and catchments. Strategic Plan. - DCCEEW

Preview of Macrophytes and macroalgae in the Swan-Canning estuary, accessed July 21, 2025,

Macrophytes and macroalgae in the Swan-Canning estuary, accessed July 21, 2025,

Contextual Support Journal

Macrophytes and macroalgae in the Swan-Canning estuary, accessed July 21, 2025,

Preview of Malkumba-Coongie Lakes National Park, accessed July 21, 2025,

Malkumba-Coongie Lakes National Park, accessed July 21, 2025,

Contextual Support Government

Malkumba-Coongie Lakes National Park, accessed July 21, 2025,

Preview of Menindee fish deaths follow up: Darling-Baaka River water tests | EPA, accessed July 21, 2025,

Menindee fish deaths follow up: Darling-Baaka River water tests | EPA, accessed July 21, 2025,

Contextual Support Government

Lake Eyre Basin - Goyder Institute for Water Research

Preview of PDF File - WATER SENSITIVE URBAN DESIGN IN THE AUSTRALIAN CONTEXT, accessed July 21, 2025,

PDF File - WATER SENSITIVE URBAN DESIGN IN THE AUSTRALIAN CONTEXT, accessed July 21, 2025,

Contextual Support Journal

WSUD Case Studies - New WAter Ways

Preview of Queensland Murray-Darling Freshwater Biogeographic Province 6 Water quality - WetlandInfo, accessed July 16, 2025,

Queensland Murray-Darling Freshwater Biogeographic Province 6 Water quality - WetlandInfo, accessed July 16, 2025,

Direct Evidence Government

Review of the current state of knowledge for the monitoring of forestry impacts on waterway health in NSW coastal forests, accessed July 31, 2025,

Preview of Water Sensitive Urban Planning Case Studies, accessed July 21, 2025,

Water Sensitive Urban Planning Case Studies, accessed July 21, 2025,

Contextual Support GreyLiterature

Water Sensitive Urban Planning Case Studies, accessed July 21, 2025,

wetland management profile - arid and semi-arid lakes - WetlandInfo, accessed July 16, 2025,

Contextual Support Journal

wetland management profile - arid and semi-arid lakes - WetlandInfo, accessed July 10, 2025,

Preview of WSUD Case Studies - New WAter Ways, accessed July 21, 2025,

WSUD Case Studies - New WAter Ways, accessed July 21, 2025,

Contextual Support GreyLiterature

Community Acceptance of Water Sensitive Urban Design: Six Case ...

Context

Region Australia
Biome Arid Inland Floodplains & Ephemeral River Systems
Land Use Urban & Developed Use
Assessment Not Stated
Season wet season
Evidence Type DegradationThreshold

Lifecycle

Status Active
Version 1
Effective From 2 Jun 2026

Notes

No specific quantitative threshold defined; 5 NTU is an approximate lower boundary for ecological disruption risk. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

Other benchmarks in the AUS-AIF-URB-WTU family.