Brisbane Overland Flow Flood Hazard Zones

Flood hazard mapping for Brisbane indicates likelihood of overland flow flooding within the Brisbane City Council area. The dataset classifies areas into High, Medium, and Low impact layers based on hazard zones H1-H6 for 5%, 2%, and 1% Annual Exceedance Probability flood events. It was created by Brisbane City Council in June 2013 using data from the Citywide Creek and Overland Flow Path mapping study.

Use Cases

• Classify property flood risk using High, Medium, and Low impact layers for urban planning applications
• Model flood hazard distribution by analyzing H1 to H6 hazard zone assignments across the council area
• Assess infrastructure vulnerability by correlating hazard zones with specific Annual Exceedance Probability (AEP) values like 5% AEP
• Prioritize mitigation resources by mapping the spatial extent of High impact layers defined for 20-year Average Recurrence Interval events

Strengths

• Data is derived from a dedicated Citywide Creek and Overland Flow Path mapping study conducted by GHD in 2017
• Provides three distinct classification layers (High, Medium, Low) based on standardized hazard zones H1-H6
• Uses established probabilistic metrics including 5%, 2%, and 1% Annual Exceedance Probability (AEP) for event definition

Limitations

• Core spatial data is not directly accessible in this listing due to a stated system issue, requiring navigation to an external portal
• The underlying flood study data is from 2017, which may not reflect recent changes in land use or drainage
• Dataset creation date is June 2013, indicating the framework and metadata are over a decade old

Provenance

Source

Brisbane City Council, sourced from the Citywide Creek and Overland Flow Path mapping study (GHD, 2017).

Collection Method

Hydrological modeling and mapping study to define hazard zones and impact layers.

Time Range

Study data from 2017; dataset framework created June 2013.

Freshness

Metadata indicates a last update in March 2026, but the core flood study data is from 2017.

Geography

Brisbane City Council local government area, Queensland, Australia.