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FPM Flood Level Contours (m AHD) (DWER-018)

The Department of Water and Environmental Regulation produces floodplain mapping of rivers and major watercourses and provides floodplain development advice to ensure that proposed floodplain development has adequate flood protection and does not impact on the existing flood regime of the area.

This advice is related to major river flooding only. Other issues, such as stormwater drainage and envirionmental and ecological considerations are not addressed.

This dataset describes how flood levels vary across the floodplain for various sized flood events. Flood levels are referenced to the Australian Height Datum (AHD)

Note: To see the full scope of the floodplain mapping, 12 dataset layers are required to be loaded in the following order:

FLOODPLAIN DATASET LAYERS:
FPM Flood Level Points (m AHD) FPM Flood Level Contours (m AHD) FPM 1 in 100 (1%) AEP Floodway and Flood Fringe Line FPM Extent of Flooding FPM Levee Banks FPM Location of Cross Sections FPM 1 in 100 (1%) AEP Floodplain Development Control Area FPM Map Index FPM Bridges FPM Special Development Condition Area FPM 1 in 100 (1%) AEP Floodway and Flood Fringe Area FPM Floodplain Area

The dataset covers the following areas:

  • Collie River - Collie Townsite.

  • Fitzroy River – Fitzroy Crossing Townsite.

  • Gascoyne River - Carnarvon Townsite and the Lower Gascoyne (contains both pre and post-stage 2 Carnarvon flood mitigation works mapping: refer to COMMENTS field)

  • Greenough River – Indian Ocean to Walkaway.

  • Preston River - Donnybrook Townsite.

  • Serpentine River, Murray River and the Peel Inlet / Harvey Estuary - Peel Inlet to the confluence of the Dandalup-South Dandalup-North Dandalup Rivers and south to the Darling Scarp via Pinjarra (Murray River) and Peel Inlet to Black Lake (Nambellup Brook) and Geogrup Lake to South Western Highway (Serpentine River).

Glossary:

  • Annual exceedance probability (AEP) - the likelihood of occurance of a flood of a given size or larger in any one year; usually expressed as a percentage.

  • 1 in 100 AEP flood - this means that there is a 1 in 100 (or 1%) chance of a flow of this size or larger occurring in any one year. This flood has a 50% chance of being experienced at least once in a person's life time. The 1 in 100 AEP flood has been generally adopted in Australia and overseas as the basis for floodplain management planning.

  • Floodplain - the portion of a river valley next to the river channel which is covered with water when the rier overflows its banks during major river flows. The term also applies to land adjacent to estauries which is subject to flooding.

  • Australian Height Datum (AHD) - is a geodetic datum for altitude measurement in Australia. It was adopted in 1971 by the National Mapping Council as the datum to which all vertical control for mapping is to be referred. The datum is based on the mean sea level (1966-1968) being assigned the value 0.000m on the Australian Height Datum (AHD) at 30 tide gauges around the coast of the Australian continent.

This dataset was formally known as FPM Flood Level Contours (m AHD) (DOW-037)

Data and Resources

Additional Info

Field Value
Access Level
Data Access Statement
Access URL
Data Portal
Data Homepage https://services.slip.wa.gov.au/public/rest/services/SLIP_Public_Services/Water/MapServer/11
Author Department of Water and Environmental Regulation
Maintainer Department of Water and Environmental Regulation
Theme Environment
Geospatial Theme Water
Published on 2016-03-11
Data last updated on 2018-10-10
Update Frequency infrequently
Temporal coverage from
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Digital Object Identifier
Citation
Geospatial Source Projection
Geospatial Coverage

Dataset extent

Map data © OpenStreetMap contributors
Tiles by MapBox
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