Water Turbidity
Benchmark Value
Scoring Curve
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
Evidence & Context
The convergence of these independent lines of evidence is striking. A biological tipping point for sensitive organisms is identified at 5 NTU, a general threshold for good clarity is cited at 10 NTU, and the upper boundary of the low-risk national guideline is 15 NTU. This body of evidence strongly indicates that maintaining very low turbidity is critical for the health of tropical savanna aquatic ecosystems.
Water turbidity measured in Nephelometric Turbidity Units (NTU), indicating the clarity of water and concentration of suspended particles.
This benchmark represents the maximum water turbidity level of 5 NTU in tropical monsoonal savanna production forestry areas, beyond which significant biological harm occurs to aquatic ecosystems. It reflects a conservation target to maintain water clarity and ecosystem health.
The benchmark is based on a triangulation of evidence from a minimally disturbed reference catchment (Daly River), national guidelines, and ecological harm thresholds, indicating that turbidity above 5 NTU causes significant biological harm.
Sources (4)
Assessing water quality - ACT Waterwatch
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Australian and New Zealand Guidelines for Fresh and Marine Water Quality (ANZG 2018)
View SourceDetermining Tipping Points and Responses of Macroinvertebrate Traits to Abiotic Factors in Support of River Management - PMC - PubMed Central
View SourceDischarge-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 SourceSupporting Sources (17)
Additional references from the underlying research that informed this benchmark.
(PDF) Water Quality Degradation of Coastal Waterways in the Wet Tropics, Australia
View SourceSalinity and water quality
View SourceAn Examination of Stream Water Quality Data from Monitoring of Forest Harvesting in the Eastern Highlands of Victoria
View Source
Assessing the seasonal dynamics of inundation, turbidity, and aquatic vegetation in the Australian wet–dry tropics - Griffith Research Online
View SourceNDVI vs NDMI: Understanding Key Vegetation Indices for Precision Agriculture -
View SourceBest Management Practices - National Association of State Foresters
View SourceCharacterising the relationship between water quality and water quantity
View SourceConceptualizing turbidity for aquatic ecosystems in the context of sustainable development goals - Environmental Science: Advances (RSC Publishing) DOI:10.1039/D2VA00327A
View Sourcedevelopment of ecosystem health bottom-line thresholds for suspended and deposited sediment in New Zealand rivers and streams - Ministry for the Environment
View Source
Managing Nonpoint Source Pollution from Forestry | Outreach & Communication | US EPA
View SourceQueensland Murray-Darling Freshwater Biogeographic Province – Water quality - WetlandInfo
View SourceThe effects of forest management on water quality - SLU
View Source
The ecology of rivers in the Australian dry tropics. - ResearchGate
View SourceTHE ENVIRONMENTAL IMPACT OF PLANT INDUSTRIES ON INLAND WATER IN THE NORTHERN TERRITORY - Department of Agriculture and Fisheries
View SourceThe State and Future of the Northern Territory's Savannas - NationBuilder
View Source
Turbidity in Surface Water — Rehabilitation Standard for the Ranger uranium mine - DCCEEW
View SourceWater quality | Department of Primary Industries, Queensland
View Source