Soil Water Infiltration Rate

AUS-TMS-FOR-SWI General Moderate confidence

Benchmark Value

30 mm/hr

Thresholds: Lower: 30, Upper: —

Direction: Lower is desirable ↓

Form: LowerThreshold

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 12 benchmarks together — the OptimalRange form drives the primary score, while 11 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary LowerThreshold Guard MaximumOnly Guard LowerThreshold Guard MinimumOnly Guard LowerThreshold Guard OptimalRange Guard Point Guard Point Guard Point Guard OptimalRange Guard LowerThreshold Guard

Evidence & Context

These findings suggest that SWIR values persistently below 30-40 mm/hr on soils that should inherently be more permeable (such as many Kandosols or well-structured Ferrosols) likely indicate significant degradation due to machinery traffic.

Metric Definition:

Lower critical threshold for Soil Water Infiltration Rate indicating significant degradation due to soil compaction and machinery traffic.

Benchmark Definition:

This benchmark represents the lower critical soil water infiltration rate threshold below which soil hydrological function is impaired due to compaction from machinery traffic in production forestry in Australian Tropical Monsoonal Savannas.

Justification:

Based on observed infiltration rates on skidder tracks and line-planted areas showing significant reduction in infiltration capacity due to soil compaction.