Flood Level Points for Modeled Design Events Across Western Australia

Floodplain mapping data contains modeled flood levels for 10 specific design flood events, including 1 in 10 AEP and Probable Maximum Flood. The Department of Water and Environmental Regulation produced this dataset for providing development advice related to major river flooding. It covers over 20 specific river systems and townsites across Western Australia.

Use Cases

• Compare FLDLVL_100 (1% AEP) and FLDLVL_PMF levels to assess flood risk extremes for infrastructure planning.
• Analyze spatial distribution of FLDLVL_MCC (Maximum Channel Capacity) values to identify hydraulic bottlenecks.
• Model flood inundation scenarios using the full range of FLDLVL_10 to FLDLVL_500 event levels for different return periods.

Strengths

• Includes modeled levels for 10 distinct design flood events, from frequent (10% AEP) to extreme (Probable Maximum Flood).
• Covers over 20 specific river systems and townsites across Western Australia, providing broad geographic coverage.
• Maintained by the authoritative Department of Water and Environmental Regulation for official floodplain development advice.

Limitations

• Focuses solely on major river flooding, excluding stormwater drainage and environmental factors which are critical for complete flood risk assessment.
• Data completeness requires loading 12 separate dataset layers in a specific order for full floodplain mapping context.
• Unknown sample size and row count limit quantitative assessment of the dataset's spatial density.

Provenance

Source

Department of Water and Environmental Regulation (Western Australia).

Collection Method

Modeled flood levels for design events, located at cross sections along river centrelines.

Time Range

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Freshness

Last updated March 2026.

Geography

Over 20 river systems and townsites in Western Australia, including Avon River, Blackwood River, Margaret River, and Peel Inlet/Harvey Estuary.