Water Turbidity

AUS-AKW-IND-WTU General Low confidence

Benchmark Value

50 NTU

Thresholds: Lower: —, Upper: 50

Direction: Lower is desirable ↓

Form: UpperThreshold

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 5 benchmarks together — the OptimalRange form drives the primary score, while 4 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary MaximumOnly Guard MaximumOnly Guard LowerThreshold Guard UpperThreshold Guard

Evidence & Context

Upper Detrimental Threshold: > 50 NTU. Persistent turbidity above this level in non-flowing water indicates chronic sediment input, leading to habitat degradation and reduced primary productivity.

Metric Definition:

Upper detrimental threshold of water turbidity indicating chronic sediment input and ecological harm.

Benchmark Definition:

Maximum turbidity level before ecological harm occurs due to chronic sediment input.

Justification:

Persistent high turbidity reduces light for photosynthesis, smothers benthic habitats and spawning grounds, clogs gills, and reduces feeding efficiency for visual predators.