Brisbane River Flood Likelihood Mapping for Council Area

June 2013 flood awareness mapping for the Brisbane City Council local government area delineates four likelihood zones for Brisbane River flooding. The dataset defines High, Medium, Low, and Very Low likelihood areas based on Annual Exceedance Probability (AEP) flood extents from the 2017 Brisbane River Catchment Flood Study.

Use Cases

• Assess property-level flood risk by analyzing proximity to High, Medium, Low, and Very Low likelihood zones.
• Model potential flood impact scenarios using the defined 5%, 1%, 0.2%, and 0.05% Annual Exceedance Probability (AEP) extents.
• Integrate flood likelihood layers into urban planning tools to identify infrastructure within specific risk categories like the 20-year Average Recurrence Interval (ARI) zone.

Strengths

• Data is derived from the authoritative Brisbane River Catchment Flood Study commissioned by the State Government in 2017.
• Provides four distinct, standardized flood likelihood categories (High, Medium, Low, Very Low) for clear risk assessment.
• Covers the entire Brisbane City Council local government area for comprehensive spatial analysis.

Limitations

• The underlying flood study data is from 2017, and extents may not reflect recent changes in catchment land use or climate patterns.
• Dataset is a spatial layer; specific row/column counts, file size, and tabular structure are unknown from the provided input.
• Focus is exclusively on river flooding from the Brisbane River, excluding other flood sources like flash or overland flooding.

Provenance

Source

Brisbane City Council open data portal, sourced from the Brisbane River Catchment Flood Study (BMT, 2017).

Collection Method

Flood extents were modeled in the 2017 catchment study commissioned by the State Government, then categorized into likelihood layers for public awareness.

Time Range

Study data from 2017; awareness map dataset created in June 2013.

Freshness

Metadata was last updated March 25, 2026, but the core flood extent data originates from a 2017 study.

Geography

Brisbane River catchment within the Brisbane City Council local government area, Queensland, Australia.