Water Electrical Conductivity (EC)

AUS-TMS-FOR-WEC General Moderate confidence

Benchmark Value

220 µS/cm
Range: 80 to 220 µS/cm
Thresholds: Lower: —, Upper: 220
Optimal Range: 80 to 220
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 11 benchmarks together — the OptimalRange form drives the primary score, while 10 guard(s) constrain the result.

Contributing Benchmarks

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

Evidence & Context

The benchmark of ²20 ³BCS/cm represents a target for high environmental health in lowland tropical monsoonal savanna rivers under sustainable production forestry, applicable primarily to wet season and general flowing conditions.

Metric Definition:

Water Electrical Conductivity (EC) as a measure of total dissolved ions in water, indicating water quality relevant to ecological health in production forestry within tropical monsoonal savannas.

Benchmark Definition:

The benchmark is defined as the maximum electrical conductivity value for water in lowland tropical monsoonal savanna rivers under sustainable production forestry, indicating high environmental health.

Justification:

This benchmark is based on established national and territory guidelines (ANZECC 2000 and NT WQOs) derived from reference site data representing minimally disturbed conditions, supported by empirical data from the Daly River, and reflects a protective threshold for aquatic ecosystems.

Sources (1)

Preview of Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000), accessed May 11, 2025,
Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000), accessed May 11, 2025, Journal

Northern Territory Government (2020) Darwin Harbour Region Water Quality Objectives, Report Card Section 3.0.

View Source

Supporting Sources (15)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Discharge-driven seasonal pattern of ionic solutes, suspended sediment and water clarity for a tropical savanna river in northern Australia - ResearchGate, accessed May 14, 2025,
(PDF) Discharge-driven seasonal pattern of ionic solutes, suspended sediment and water clarity for a tropical savanna river in northern Australia - ResearchGate, accessed May 14, 2025,
Contextual Support Journal

Environmental Water Requirements of Vallisneria nana in the Daly River, Northern Territory1 | Request PDF - ResearchGate

View Source
Preview of A longitudinal survey of the water quality of the ... - Territory Stories
A longitudinal survey of the water quality of the ... - Territory Stories
Contextual Support

A longitudinal survey of the water quality of the ... - Territory Stories

View Source
Preview of Conservation Management Zones of Australia - North ... - DCCEEW, accessed May 20, 2025,
Conservation Management Zones of Australia - North ... - DCCEEW, accessed May 20, 2025,
Contextual Support Journal

Quantifying interception associated with large-scale plantation forestry in the Northern Territory - Resilient Landscapes Hub

View Source
Preview of Deriving guideline values using reference-site data - Water Quality Australia, accessed August 12, 2025
Deriving guideline values using reference-site data - Water Quality Australia, accessed August 12, 2025
Contextual Support Government

Water Quality Guidelines Home - Water Quality Australia

View Source
Preview of Diatom–water quality thresholds in South Australian streams indicate a need for more stringent water quality guidelines | Request PDF - ResearchGate, accessed May 11, 2025,
Diatom–water quality thresholds in South Australian streams indicate a need for more stringent water quality guidelines | Request PDF - ResearchGate, accessed May 11, 2025,
Contextual Support

Validating species sensitivity distributions using salinity tolerance of riverine macroinvertebrates in the southern Murray–Darling Basin (Victoria, Australia) - Canadian Science Publishing

View Source
Preview of Discharge-driven seasonal pattern of ionic solutes, suspended sediment and water clarity for a tropical savanna river in northern Australia - CSIRO PUBLISHING | Marine and Freshwater Research, accessed July 24, 2025
Discharge-driven seasonal pattern of ionic solutes, suspended sediment and water clarity for a tropical savanna river in northern Australia - CSIRO PUBLISHING | Marine and Freshwater Research, accessed July 24, 2025
Contextual Support Journal

Discharge-driven seasonal pattern of ionic solutes, suspended sediment and water clarity for a tropical savanna river in northern Australia - CSIRO PUBLISHING | Marine and Freshwater Research

View Source
Preview of Dry-season changes in macroinvertebrate assemblages of highly seasonal rivers - Griffith Research Online
Dry-season changes in macroinvertebrate assemblages of highly seasonal rivers - Griffith Research Online
Contextual Support

Dry-season changes in macroinvertebrate assemblages of highly seasonal rivers - Griffith Research Online

View Source
Preview of environment.nt.gov.au, accessed May 11, 2025,
environment.nt.gov.au, accessed May 11, 2025,
Contextual Support Journal

Water Quality objectives for the region - Department of Lands, Planning and Environment

View Source
Preview of Environmental Values, Water Quality Objectives and Targets for the Black Ross Water Quality Improvement Plan - Creek to Coral
Environmental Values, Water Quality Objectives and Targets for the Black Ross Water Quality Improvement Plan - Creek to Coral
Contextual Support Journal

Environmental Values, Water Quality Objectives and Targets for the Black Ross Water Quality Improvement Plan - Creek to Coral

View Source
Preview of fwpa.com.au, accessed May 15, 2025
fwpa.com.au, accessed May 15, 2025
Contextual Support Journal

Defining deforestation free supply chains for red meat products

View Source
Preview of Impact of secondary salinisation on freshwater ecosystems: effects of contrasting, experimental, short-term releases of saline wastewater on macroinvertebrates in a lowland stream - CSIRO Publishing, accessed August 8, 2025,
Impact of secondary salinisation on freshwater ecosystems: effects of contrasting, experimental, short-term releases of saline wastewater on macroinvertebrates in a lowland stream - CSIRO Publishing, accessed August 8, 2025,
Contextual Support Journal

Comparison of two commonly used methods for identifying water quality thresholds in freshwater ecosystems using field and synthetic data - PubMed

View Source
Preview of The impact of fire on riparian vegetation in Australia's tropical savanna - ResearchGate, accessed May 17, 2025,
The impact of fire on riparian vegetation in Australia's tropical savanna - ResearchGate, accessed May 17, 2025,
Contextual Support Journal

Bird distribution in riparian vegetation in the extensive natural landscape of Australia's tropical Savanna: a broad-scale survey and analysis of a distributional data base - ResearchGate

View Source
Preview of Water quality | Australia state of the environment 2021
Water quality | Australia state of the environment 2021
Contextual Support Journal

Water quality | Australia state of the environment 2021

View Source
Preview of Water quality | Australia state of the environment 2021, accessed August 11, 2025,
Water quality | Australia state of the environment 2021, accessed August 11, 2025,
Contextual Support Government

Drivers of water quality in Afromontane-savanna rivers - Frontiers

View Source
Preview of Water quality guidelines - Queensland Environment Department, accessed August 1, 2025,
Water quality guidelines - Queensland Environment Department, accessed August 1, 2025,
Contextual Support Government

Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000)

View Source

Context

  • Region Australia
  • Biome Tropical Monsoonal Savannas
  • Land Use Production Forestry
  • Assessment Pristine Reference
  • Evidence Type TargetCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 25 Mar 2026

Notes

The benchmark applies primarily to wet season and general flowing conditions, acknowledging natural seasonal variability with higher dry season EC values. No specific detrimental lower threshold was identified; the focus is on preventing anthropogenic increases above natural levels. Exceeding 220 ³BCS/cm outside natural dry season peaks indicates potential ecological harm.