Water Electrical Conductivity (EC)

AUS-TDG-LVG-WEC General Moderate confidence

Benchmark Value

No specific value — see range

Range: 125 to 500 µS/cm

Optimal Range: 125 to 500

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 OptimalRange Guard MaximumOnly Guard OptimalRange Guard MaximumOnly Guard MaximumOnly Guard OptimalRange Guard MaximumOnly Guard MaximumOnly Guard Point Guard Point Guard MaximumOnly Guard MaximumOnly Guard

Evidence & Context

The following table presents the derived benchmark for Water Electrical Conductivity (EC) representing the best available condition under sustainable livestock grazing in the specified biome.Table 1: Water Electrical Conductivity (EC) Benchmark Summary

Metric Definition:

Water Electrical Conductivity (EC) is a measure of the ability of water to conduct an electric current, which is directly related to the concentration of dissolved salts and ions.

Benchmark Definition:

This benchmark represents the best available condition for Water Electrical Conductivity (EC) in water under sustainable livestock grazing in Temperate Dry Woodlands & Native Grasslands, reflecting a range of 125 to 500 µS/cm that indicates low salt concentration and healthier aquatic ecosystems.

Justification:

This range is derived from the lower segment of the default low-risk trigger value range (125–2200 µS/cm) for lowland rivers in South-East Australia, as specified in the ANZECC & ARMCANZ (2000) guidelines. These guidelines apply to slightly-moderately disturbed systems. The lower portion (125–500 µS/cm) is interpreted as representing the best available condition achievable under best-practice sustainable/regenerative grazing in Temperate Dry Woodlands & Native Grasslands. This assumes best practices minimize anthropogenic salt mobilization, maintaining conditions closer to the natural baseline of less disturbed catchments within the biome's inherent variability.

Sources (1)

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

ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia

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Supporting Sources (1)

Additional references from the underlying research that informed this benchmark.

Effects of Stock Grazing on Biodiversity Values in ... - ACT Government, accessed August 4, 2025

Contextual Support Journal

Yellow Box – Blakely's Red Gum Grassy Woodland and Derived ...

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Context

Region Australia
Biome Temperate Dry Woodlands & Native Grasslands
Land Use Livestock Grazing & Pasture
Assessment Not Stated
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 3 Jun 2026

Notes

No ecologically detrimental lower EC threshold is identified for freshwater ecosystems in this context. The ANZECC low-risk range (125–2200 µS/cm for lowland rivers) represents acceptable conditions, with the lower end (125-500 µS/cm) likely reflecting higher ecological health states achievable with best management. Evidence suggests potential detrimental effects on aquatic ecosystem health occur as EC rises above approximately 1500 µS/cm, with significant biodiversity impacts noted above ~1000 mg/L TDS (~1500 µS/cm). The upper ANZECC trigger (2200 µS/cm) marks a threshold beyond which risk requires investigation. Levels exceeding this range indicate degraded conditions, not a beneficial natural state. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

Other benchmarks in the AUS-TDG-LVG-WEC family.