Floodplain Cross Section Locations for Western Australian Rivers

Department of Water and Environmental Regulation provides spatial data on surveyed river channel and floodplain cross sections. The dataset includes flood level attributes for 10 distinct Annual Exceedance Probability (AEP) events, such as 1-in-10 and 1-in-100 year floods. It covers 17 specific river systems and townsites across Western Australia.

Use Cases

• Model flood inundation extents using the FLDLVL_100 or FLDLVL_500 attributes for 1% and 0.2% AEP events.
• Analyze flood risk gradients across a floodplain by comparing chainage distances and associated FLDLVL_DFE (Designated Flood Event) levels.
• Assess maximum channel capacity constraints for infrastructure planning using the FLDLVL_MCC attribute.
• Correlate cross-section locations with other floodplain mapping layers, such as Flood Level Contours or Floodway Areas, for comprehensive hazard modeling.

Strengths

• Includes flood levels for 10 distinct flood event probabilities, from common 10% AEP to extreme Probable Maximum Flood (FLDLVL_PMF).
• Covers 17 specific river systems and townsites across Western Australia, providing regional hazard data.
• Data is provided in 9 interoperable geospatial formats, including SHP, GEOJSON, and WFS services.

Limitations

• Dataset scope is limited to major river flooding; it excludes stormwater drainage and ecological considerations.
• Full floodplain analysis requires joining with 11 other specific dataset layers, increasing complexity.
• Row count, column count, and individual sample data points are not provided, limiting initial assessment.

Provenance

Source

Department of Water and Environmental Regulation, Geospatial and Data Services Manager.

Collection Method

Produced from floodplain mapping involving modelled and surveyed cross sections of river channels and floodplains.

Time Range

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Freshness

Last updated March 2026.

Geography

Western Australia, covering 17 specified river systems and townsites including Avon River, Swan River, Fitzroy River, and Margaret River.