Water Turbidity

AUS-ASC-CON-WTU General High confidence

Benchmark Value

No specific value — see range

Range: 0 to 2 NTU

Optimal Range: 0 to 2

Direction: Lower 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 6 benchmarks together — the OptimalRange form drives the primary score, while 5 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary MaximumOnly Guard MaximumOnly Guard MaximumOnly Guard OptimalRange Guard MaximumOnly Guard

Evidence & Context

The optimal range for water turbidity in Australian Alpine and Subalpine Conservation Areas, reflecting high environmental health and sustainable ecological function, is consistent with the reference value for the best available condition: < 2 NTU, and frequently < 1 NTU.

Metric Definition:

Water turbidity measured in Nephelometric Turbidity Units (NTU), indicating the cloudiness or haziness of water caused by suspended particulate matter.

Benchmark Definition:

This benchmark defines the optimal water turbidity range in NTU for maintaining high environmental health and sustainable ecological function in the Australian Alpine and Subalpine Conservation Areas.

Justification:

Supported by monitoring data from sites within Kosciuszko National Park assessed as being in 'good' ecological condition.

Sources (1)

NSW alpine resorts environmental performance report 2020–21 Journal

NSW Alpine Resorts Environmental Performance Report 2020–21

View Source

Supporting Sources (3)

Additional references from the underlying research that informed this benchmark.

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

Contextual Support GreyLiterature

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

View Source

National Guidelines for Water Quality - Department of Natural Resources and Environment Tasmania, accessed August 1, 2025,

Regulatory Framework

Australian and New Zealand Guidelines for Fresh and Marine Water ...

View Source

Victorian Water Quality Analysis 2022 Technical Report - Water and ..., accessed August 12, 2025,

Contextual Support Journal

Victorian Water Quality Analysis 2022 Technical Report - Water and ..., accessed August 10, 2025

View Source

Context

Region Australia
Biome Alpine and Subalpine Complex
Land Use Conservation / Protected Natural Areas
Assessment Conservation Target
Evidence Type HealthyOperationalRange

Lifecycle

Status Active
Version 1
Effective From 17 Mar 2026

Notes

Maintaining turbidity within this very low range supports maximum light penetration for aquatic photosynthesis and preserves clear water habitats essential for sensitive alpine aquatic species.

Related Benchmarks

Other benchmarks in the AUS-ASC-CON-WTU family.