FPM 1 in 100 (1%) AEP Floodway and Flood Fringe Line (DWER-015)

Four geospatial boundary lines delineating the 1 in 100 annual exceedance probability floodplain, produced by the Department of Water and Environmental Regulation. The dataset covers specific townsites along 15 major rivers and watercourses in Western Australia, including the Swan, Avon, and Blackwood Rivers. It is part of a 12-layer floodplain mapping series required for a complete view of flood risk.

Use Cases

• Delineating floodway limits for development control based on the defined floodway and flood fringe boundaries.
• Overlaying floodplain boundaries with land parcel data to assess property-level flood risk based on the 1% AEP standard.
• Integrating line data with other floodplain mapping layers, such as flood level contours and levee banks, for comprehensive flood modeling.

Strengths

• Covers 15 distinct river systems and associated townsites across Western Australia.
• Defines four specific boundary types (Floodway limit, Extent of 1% AEP flooding, Extent of floodway, Extent of study) for precise mapping.
• Designed to overlay precisely with a corresponding polygon dataset for the same floodplain areas.

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download.
• Column-level documentation is absent; field semantics must be inferred after download.
• Focuses solely on major river flooding, excluding considerations for stormwater drainage and ecological impacts as noted in the description.

Provenance

Source

Department of Water and Environmental Regulation (Geospatial and Data Services Manager)

Collection Method

Produced as part of the department's floodplain mapping and development advice activities.

Freshness

Last updated 2026-06-29 07:47:04.309769; freshness should be verified.

Geography

Townsites along the Avon, Blackwood, Brunswick, Coblinine, Collie, Chapman, Denmark, Gascoyne, Gribble Creek, Harding, Irwin, Lower Collie, Preston, Serpentine, and Swan River systems in Western Australia.