Water Electrical Conductivity (EC)

AUS-AKW-LVG-WEC General Moderate confidence

Benchmark Value

3000 μS/cm
Direction: Lower is desirable ↓
Form: MaximumOnly

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

Based on the proxy analysis of the best available groundwater data, the proposed reference value for Water Electrical Conductivity (EC) representing the "best available condition" in Australia's Arid Karstic Woodlands & Shrublands under sustainable livestock grazing is < 3,000 μS/cm.

Metric Definition:

Water Electrical Conductivity (EC) representing the best available condition in ephemeral surface water bodies proxied by shallow groundwater quality.

Benchmark Definition:

This benchmark represents the maximum acceptable Water Electrical Conductivity (EC) level in ephemeral surface waters, proxied by groundwater, in Australia's Arid Karstic Woodlands & Shrublands under sustainable livestock grazing. It reflects the upper limit of natural salinity conditions to maintain ecosystem health.

Justification:

This value is derived from the upper limit of the best-quality groundwater zone (< 2,000 mg/L TDS or ~3,125 μS/cm) identified in the most comprehensive hydrogeological survey of the specific pastoral region. It represents the least saline natural water in the managed landscape and is a scientifically defensible proxy due to the absence of direct surface water data.

Sources (1)

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An inventory and condition survey of the Western Australian part of the Nullarbor region, accessed July 25, 2025 Journal

(PDF) Phosphorus status and saturation in soils that drain into the ...

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Supporting Sources (32)

Additional references from the underlying research that informed this benchmark.

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(PDF) Effects of increasing salinity on freshwater ecosystems in Australia - ResearchGate, accessed August 11, 2025,
Contextual Support GreyLiterature

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

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

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Anatomical Response of Atriplex Leaves under Different Levels of Sodium Chloride Salinity - Journal of Plant Production Sciences, accessed July 25, 2025,
Contextual Support Journal

Anatomical Response of Atriplex Leaves under Different Levels of Sodium Chloride Salinity - Journal of Plant Production Sciences, accessed July 25, 2025

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Atriplex vesicaria - Wikipedia, accessed July 25, 2025,
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Atriplex vesicaria - Wikipedia, accessed July 25, 2025

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Barwon Darling and Far Western Water Quality Objectives explained - NSW Government, accessed July 25, 2025,
Contextual Support Journal

Barwon Darling and Far Western Water Quality Objectives explained - NSW Government, accessed July 25, 2025

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Can simple, on-ground vegetation and soil measures reliably indicate the health of rangelands? An application in Australia's semi-arid woodlands - CSIRO Publishing, accessed July 30, 2025
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The Rangeland Journal - CSIRO PUBLISHING, accessed July 10, 2025

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Categories - Water quality - CSIRO Data Access Portal, accessed July 16, 2025,
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DRAFT Regional groundwater chemistry zones: SEQ region ..., accessed July 25, 2025,
Contextual Support GreyLiterature

DRAFT Regional groundwater chemistry zones: SEQ region ..., accessed July 25, 2025

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Dryland salinity in Western Australia | Agriculture and Food, accessed July 25, 2025,
Contextual Support Government

Dryland salinity in Western Australia | Agriculture and Food, accessed July 25, 2025

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Groundwater Contamination in Karst Regions Affects Human Health - Eos.org, accessed July 25, 2025,
Contextual Support Journal

Groundwater Contamination in Karst Regions Affects Human Health - Eos.org, accessed July 25, 2025

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Preview of Groundwater in Australia, accessed July 25, 2025
Groundwater in Australia, accessed July 25, 2025
Contextual Support Journal

Thermal anomaly and water origin in Weebubbie Cave, Nullarbor Karst Plain, Australia, accessed July 25, 2025

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Karst Groundwater Systems: a brief overview - ACKMA 1973 - 2011, accessed July 27, 2025
Contextual Support

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National Guidelines for Water Quality - Department of Natural Resources and Environment Tasmania, accessed July 25, 2025,
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Nullarbor bioregion - DCCEEW, accessed July 27, 2025
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NVIS Fact sheet MVG 22 – Chenopod shrublands, samphire shrublands and forblands - DCCEEW, accessed July 24, 2025
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The piosphere revisited: plant species patterns close to waterpoints in small, fenced paddocks in chenopod shrublands of South Australia - Bohrium, accessed July 25, 2025,
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The piosphere revisited: plant species patterns close to waterpoints in small, fenced paddocks in chenopod shrublands of South Australia - Bohrium, accessed July 25, 2025

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Thermal anomaly and water origin in Weebubbie Cave, Nullarbor Karst Plain, Australia, accessed July 26, 2025,
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Context

  • Region Australia
  • Biome Arid Karstic Woodlands & Shrublands
  • Land Use Livestock Grazing & Pasture
  • Assessment Not Stated
  • Evidence Type ReferenceCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 4 Jun 2026

Notes

No upper detrimental threshold — higher values are always better up to natural saturation. The benchmark is a proxy based on groundwater salinity as direct surface water EC data is unavailable. The ecosystem is saline-adapted, so a lower critical threshold is not applicable. The optimal range is the stable natural saline regime, likely from < 3,000 to ~8,000 μS/cm. Harm is defined by anthropogenic alteration beyond natural variability. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.