Gully Density

AUS-TMI-URB-GUL General Moderate confidence

Benchmark Value

0 m/ha
Direction: Lower is desirable ↓
Form: Point

Scoring Curve

Scoring curve unavailable

The scoring engine could not generate a curve for this benchmark context. The primary form is Point, 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

Point Primary MaximumOnly Guard Point Guard MaximumOnly Guard Point Guard MaximumOnly Guard

Evidence & Context

The benchmark of 0 m/ha represents the ideal and achievable state of a stable, well-managed urban landscape under best-practice Water Sensitive Urban Design (WSUD).

Metric Definition:

Gully Density is calculated as the total length of active gullies within a given area, typically expressed in units of metres per hectare (m/ha).

Benchmark Definition:

This benchmark represents the ideal condition of zero gully formation in urban and developed land within Australia's Tropical & Subtropical Maritime Islands biome, indicating stable and well-managed landscapes under best-practice stormwater design.

Justification:

Derived from geomorphic principles and Water Sensitive Urban Design objectives, this benchmark reflects the prevention of gully formation rather than observed field measurements.

Sources (1)

Preview of Australian Guidelines for Urban stormwater Management - Paper 10
Australian Guidelines for Urban stormwater Management - Paper 10 Government

Australian Guidelines for Urban stormwater Management - Paper 10

View Source

Supporting Sources (3)

Additional references from the underlying research that informed this benchmark.

Preview of Norfolk Island Water Resource Assessment - Department of ...
Norfolk Island Water Resource Assessment - Department of ...
Irrelevant

Norfolk Island Water Resource Assessment - Department of ...

View Source
Preview of The Lord Howe Island Biodiversity Management Plan: An integrated approach to recovery planning - ResearchGate, accessed August 3, 2025,
The Lord Howe Island Biodiversity Management Plan: An integrated approach to recovery planning - ResearchGate, accessed August 3, 2025,
Contextual Support

The Lord Howe Island Biodiversity Management Plan: An integrated approach to recovery planning - ResearchGate

View Source
Preview of Water Sensitive Urban Design Guidelines Wollondilly Shire Council, accessed August 11, 2025,
Water Sensitive Urban Design Guidelines Wollondilly Shire Council, accessed August 11, 2025,
Contextual Support

Water Sensitive Urban Design Guidelines Wollondilly Shire Council

View Source

Context

  • Region Australia
  • Biome Tropical & Subtropical Maritime Islands
  • Land Use Urban & Developed Use
  • Assessment Not Stated
  • Evidence Type ReferenceCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 9 Jun 2026

Notes

No upper detrimental threshold — higher values indicate landscape degradation and failure of stormwater management. Any gully density greater than zero signifies a failure in urban stormwater management and landscape stability. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.