Water Turbidity

AUS-AKW-IND-WTU General Low confidence

Benchmark Value

5 NTU

Thresholds: Lower: 5, Upper: —

Direction: Higher is desirable ↑

Form: LowerThreshold

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 5 benchmarks together — the OptimalRange form drives the primary score, while 4 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary MaximumOnly Guard MaximumOnly Guard LowerThreshold Guard UpperThreshold Guard

Evidence & Context

Lower Critical Threshold: > 5 NTU. Levels below this may increase stress from UV radiation in shallow, clear pools.

Metric Definition:

Lower critical threshold of water turbidity to provide UV radiation shielding in ephemeral pools.

Benchmark Definition:

Minimum turbidity level to protect aquatic life from harmful UV radiation.

Justification:

Suspended particles absorb and scatter harmful UV-B radiation, protecting sensitive aquatic organisms in shallow, exposed arid-zone pools.

Sources (1)

Australia's inland waters - Water Quality Australia Government

Australia's inland waters - Water Quality Australia

View Source

Supporting Sources (1)

Additional references from the underlying research that informed this benchmark.

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

Direct Evidence Journal

Salinity and water quality

View Source

Context

Region Australia
Biome Arid Karstic Woodlands & Shrublands
Land Use Industrial & Infrastructure Use
Assessment Pristine Reference
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 19 Mar 2026

Notes

Levels below this threshold may increase UV stress on aquatic life.

Related Benchmarks

Other benchmarks in the AUS-AKW-IND-WTU family.