Water Electrical Conductivity (EC)

AUS-TMI-FOR-WEC General Moderate confidence

Benchmark Value

No specific value — see range

Range: 120 to 800 µS/cm

Optimal Range: 120 to 800

Direction: Lower is desirable ↓

Form: OptimalRange

Scoring Curve

Scoring curve unavailable

The scoring engine could not generate a curve for this benchmark context. The primary form is CompositeFramework, but the benchmark data may be missing required fields (e.g., optimal range bounds for an OptimalRange benchmark). This is typically a data quality issue in the benchmark pipeline.

Contributing Benchmarks

CompositeFramework Primary OptimalRange Guard MaximumOnly Guard MaximumOnly Guard OptimalRange Guard MaximumOnly Guard OptimalRange Guard OptimalRange Guard MaximumOnly Guard MinimumOnly Guard MaximumOnly Guard OptimalRange Guard

Evidence & Context

Based on these guidelines, the default trigger value range for electrical conductivity in tropical Australian lowland rivers (defined as those below 150 m altitude) is 120 – 800 µS/cm.

Metric Definition:

Electrical conductivity (EC) of surface waters in tropical Australian lowland rivers under slightly disturbed conditions.

Benchmark Definition:

This benchmark represents the default trigger value range for electrical conductivity in slightly disturbed tropical Australian lowland rivers, indicating the boundaries for maintaining a healthy aquatic ecosystem in this biome and land use context.

Justification:

This benchmark is derived from the ANZECC & ARMCANZ (2000) default trigger values for 'slightly disturbed' tropical Australian lowland rivers, used as a scientifically defensible proxy due to the absence of direct field data from a best-practice production forestry site in the specified biome.

Sources (1)

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

ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia

View Source

Supporting Sources (4)

Additional references from the underlying research that informed this benchmark.

Preview of Investigating the potential for groundwater from different vegetation, soil and landuses to stimulate blooms of the cyanobacterium, Lyngbya majuscula, in coastal waters - CSIRO PUBLISHING | Marine and Freshwater Research

Investigating the potential for groundwater from different vegetation, soil and landuses to stimulate blooms of the cyanobacterium, Lyngbya majuscula, in coastal waters - CSIRO PUBLISHING | Marine and Freshwater Research

Contextual Support Journal

Taking stock. Which way from here? - Norfolk Island's Reef, accessed July 27, 2025

View Source

Norfolk Island Water Resource Assessment

Contextual Support Journal

Norfolk Island Water Resource Assessment

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The most beautiful Australian islands - Tourism Australia, accessed August 2, 2025,

Contextual Support

The most beautiful Australian islands - Tourism Australia, accessed August 4, 2025,

View Source

The relationship between groundwater and surface water character and wetland habitats, Bribie Island, Queensland - ResearchGate

Contextual Support Journal

The relationship between groundwater and surface water character and wetland habitats, Bribie Island, Queensland - ResearchGate

View Source

Context

Region Australia
Biome Tropical & Subtropical Maritime Islands
Land Use Production Forestry
Assessment Not Stated
Evidence Type ReferenceCondition

Lifecycle

Status Superseded
Version 1
Effective From 5 Jun 2026
Effective To 5 Jun 2026

Notes

The range 120 – 800 µS/cm represents the acceptable boundaries for maintaining a healthy aquatic ecosystem in a slightly disturbed tropical setting. The lower boundary is not a critical threshold but a demarcation between pristine and well-managed systems. The upper boundary is a detrimental threshold indicating potential environmental harm if exceeded. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

Other benchmarks in the AUS-TMI-FOR-WEC family.