Water Electrical Conductivity (EC)

AUS-AKW-CON-WEC General Moderate confidence

Benchmark Value

1000 μS/cm

Thresholds: Lower: —, Upper: 1000

Direction: Higher is desirable ↑

Form: MaximumOnly

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 7 benchmarks together — the OptimalRange form drives the primary score, while 6 guard(s) constrain the result.

Contributing Benchmarks

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

Evidence & Context

The benchmark represents the typical fresh condition (< 1,000 μS/cm) of groundwater that defines the "Karst Springs and Associated Alkaline Fens," a threatened, groundwater-dependent ecological community in a South Australian karstic landscape.

Metric Definition:

Water Electrical Conductivity (EC) as a measure of the ability of groundwater to conduct electrical current, indicating salinity levels relevant to ecological health in karstic groundwater-dependent ecosystems.

Benchmark Definition:

This benchmark defines the maximum electrical conductivity of groundwater in protected karstic ecosystems, indicating fresh water conditions essential for ecological health in the Arid Karstic Woodlands & Shrublands biome.

Justification:

This value is selected as the most direct, ecologically-defined reference for a high-health karstic system in a protected context. It aligns well with data from other arid and semi-arid systems where high-quality "freshwater lenses" are defined as having < 1,000 mg/L TDS (equivalent to ~1,538μS/cm).

Sources (2)

Preview of Conservation Advice for the Karst springs and associated alkaline fens of the Naracoorte Coastal Plain Bioregion

Conservation Advice for the Karst springs and associated alkaline fens of the Naracoorte Coastal Plain Bioregion Journal

Conservation Advice for the Karst springs and associated alkaline fens of the Naracoorte Coastal Plain Bioregion

Preview of DEPARTMENT OF MINES AND ENERGY SOUTH AUSTRALIA REPORT BOOK 96/10 MUSGRAVE PROCLAIMED WELLS AREA GROUNDWATER ASSESSMENT by A J L - NET

DEPARTMENT OF MINES AND ENERGY SOUTH AUSTRALIA REPORT BOOK 96/10 MUSGRAVE PROCLAIMED WELLS AREA GROUNDWATER ASSESSMENT by A J L - NET Journal

DEPARTMENT OF MINES AND ENERGY SOUTH AUSTRALIA REPORT BOOK 96/10 MUSGRAVE PROCLAIMED WELLS AREA GROUNDWATER ASSESSMENT by A J L - NET

Supporting Sources (17)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Subterranean Fauna of the Arid Zone - ResearchGate, accessed July 27, 2025,

(PDF) Subterranean Fauna of the Arid Zone - ResearchGate, accessed July 27, 2025,

Contextual Support GreyLiterature

How to Calculate Electrical Conductivity From TDS? - Rika Sensor, accessed July 27, 2025,

Preview of Conductivity, TDS, Salinity, Resistivity - apera instruments, accessed July 20, 2025,

Conductivity, TDS, Salinity, Resistivity - apera instruments, accessed July 20, 2025,

Methodology Source Journal

Geological Control upon Groundwater Flow and Major Ion Chemistry with Influence on Basin Management in a Coastal Aquifer, South Australia - Scientific Research Publishing, accessed July 27, 2025,

Preview of CONSULTATION INFORMATION PACK Establishing baseline data for the conservation of Koonalda Cave, accessed July 27, 2025,

CONSULTATION INFORMATION PACK Establishing baseline data for the conservation of Koonalda Cave, accessed July 27, 2025,

Contextual Support GreyLiterature

CONSULTATION INFORMATION PACK Establishing baseline data for the conservation of Koonalda Cave, accessed July 27, 2025,

Preview of Eyre Peninsula Groundwater Dependent Ecosystem Scoping Study - Department for Environment and Water, accessed July 27, 2025,

Eyre Peninsula Groundwater Dependent Ecosystem Scoping Study - Department for Environment and Water, accessed July 27, 2025,

Contextual Support Journal

Eyre Peninsula Groundwater Dependent Ecosystem Scoping Study - Department for Environment and Water, accessed July 27, 2025,

Preview of Geology of Australia | EBSCO Research Starters, accessed July 27, 2025,

Geology of Australia | EBSCO Research Starters, accessed July 27, 2025,

Contextual Support GreyLiterature

GSA Today - The evolution of end-member continental waters: The origin of acidity in southern Western Australia, accessed July 27, 2025,

Preview of Guide to New South Wales Karst and Caves - Environment and Heritage, accessed July 25, 2025,

Guide to New South Wales Karst and Caves - Environment and Heritage, accessed July 25, 2025,

Contextual Support

The Nullarbor deserves better protection - La Trobe University, accessed July 27, 2025,

Preview of Investigation on the groundwater resources of the South Eyre Peninsula, South Australia, determined from laterally constrained inversion of tempest data - ResearchGate, accessed July 27, 2025,

Investigation on the groundwater resources of the South Eyre Peninsula, South Australia, determined from laterally constrained inversion of tempest data - ResearchGate, accessed July 27, 2025,

Contextual Support GreyLiterature

Investigation on the groundwater resources of the South Eyre Peninsula, South Australia, determined from laterally constrained inversion of tempest data - ResearchGate, accessed July 27, 2025,

Preview of Karst and agriculture in Australia - Digital Commons @ USF, accessed July 27, 2025,

Karst and agriculture in Australia - Digital Commons @ USF, accessed July 27, 2025,

Contextual Support Journal

Karst and agriculture in Australia - Digital Commons @ USF, accessed July 27, 2025,

Preview of Nullarbor Plain - Wikipedia, accessed July 25, 2025,

Nullarbor Plain - Wikipedia, accessed July 25, 2025,

Contextual Support GreyLiterature

Nullarbor Plain - Wikipedia, accessed July 24, 2025

Preview of Palaeovalley Groundwater Resources in Arid and Semi-Arid Australia, accessed July 27, 2025,

Palaeovalley Groundwater Resources in Arid and Semi-Arid Australia, accessed July 27, 2025,

Contextual Support Journal

Palaeovalley Groundwater Resources in Arid and Semi-Arid Australia, accessed July 27, 2025,

Preview of Salinity tolerance of stygofauna at Mulga Downs Iron Ore Mine - EPA WA, accessed July 27, 2025,

Salinity tolerance of stygofauna at Mulga Downs Iron Ore Mine - EPA WA, accessed July 27, 2025,

Contextual Support Journal

Stygofaunal community trends along varied rainfall conditions: Deciphering ecological niche dynamics of a shallow calcrete in We - Archimer, accessed July 27, 2025,

Preview of TDS and EC Conversion - Snowate, accessed July 27, 2025,

TDS and EC Conversion - Snowate, accessed July 27, 2025,

Methodology Source GreyLiterature

TDS and EC Conversion - Snowate, accessed July 27, 2025,

Preview of The Nullarbor deserves better protection - La Trobe University, accessed July 26, 2025,

The Nullarbor deserves better protection - La Trobe University, accessed July 26, 2025,

Contextual Support GreyLiterature

Karst and agriculture in Australia - Digital Commons @ USF, accessed July 23, 2025

Preview of Total dissolved solids | Australian Drinking Water Guidelines - NHMRC, accessed July 27, 2025,

Total dissolved solids | Australian Drinking Water Guidelines - NHMRC, accessed July 27, 2025,

Contextual Support Government

Total dissolved solids | Australian Drinking Water Guidelines - NHMRC, accessed July 13, 2025

Preview of Water Data SA – Available Data - WaterConnect, accessed July 27, 2025,

Water Data SA – Available Data - WaterConnect, accessed July 27, 2025,

Contextual Support Journal

Water Data SA 62 Available Data - WaterConnect, accessed August 1, 2025

Preview of Water in the region - Landscape South Australia - Alinytjara Wilurara, accessed July 27, 2025,

Water in the region - Landscape South Australia - Alinytjara Wilurara, accessed July 27, 2025,

Contextual Support Government

Falls in groundwater for southern Eyre Peninsula in South Australia force 2024 decision for plant to desalinate seawater | Adelaide AZ, accessed July 27, 2025,

Preview of www.dcceew.gov.au, accessed July 27, 2025,

www.dcceew.gov.au, accessed July 27, 2025,

Contextual Support

Interim Management Guidelines For The Nullarbor Caves And Selected Karst Features - ACKMA 1973 - 2011, accessed July 27, 2025,

Context

Region Australia
Biome Arid Karstic Woodlands & Shrublands
Land Use Conservation / Protected Natural Areas
Assessment Conservation Target
Evidence Type ReferenceCondition

Lifecycle

Status Superseded
Version 1
Effective From 19 Mar 2026
Effective To 19 Mar 2026

Notes

Confidence is rated 'Moderate' rather than 'High' because the primary source is from a semi-arid/Mediterranean climate, not a truly arid one like the Nullarbor Plain. Direct, published EC data from protected GDEs on the Nullarbor itself is currently lacking, pending outcomes from studies such as the Koonalda Cave baseline monitoring project. The functional range for this indicator includes no relevant lower threshold, an optimal range up to 1,500 μS/cm, and an upper detrimental threshold at ~5,000 μS/cm.

Related Benchmarks

Other benchmarks in the AUS-AKW-CON-WEC family.