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 environmental and ecological considerations are not addressed.
This dataset comprises polygon map sheets that describe the availability of hard copy plans showing the floodplain mapping.
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:
Avon River - Toodyay to Beverley.
Blackwood River – Augusta, Bridgetown, Nannup and Boyup Brook Townsites.
Bow River - Bow Bridge Townsite.
Capel River - Capel Townsite.
Chapman River – Geraldton Townsite.
Cohn Creek - Merredin Townsite.
Collie River - Collie Townsite.
Corrigin Townsite.
Denmark River – Denmark Townsite.
Fitzroy River – Fitzroy Crossing Townsite.
Gascoyne River - Carnarvon Townsite and the Lower Gascoyne.
Gordon River – Tambellup Townsite.
Greenough River – Indian Ocean to Walkaway.
Gribble Creek - Kalgoorlie Townsite.
Harding River – Roebourne Townsite.
Irwin River - Dongara Townsite.
Margaret River – Margaret River Townsite.
Murray River - Ravenswood to Blythewood.
Nullagine River – Nullagine Townsite.
Preston River - Boyanup and Donnybrook Townsites.
Serpentine River, Murray River and the Peel Inlet / Harvey Estuary - Peel Inlet / Harvey Estuary to Pinjarra and south to the Darling Scarp (Murray River) and Peel Inlet / Harvey Estuary to Wellard and east to South Western Highway (Serpentine River).
Serpentine River - Peel Inlet to Serpentine / Baldivis.
Swan River, Canning River and Tributaries: Fremantle to Walyunga National Park (Swan River) and Canning Bridge to Brookton Highway (Canning River). Tributaries include Bennett Brook, Blackadder Creek, Ellen Brook, Helena River, Jane Brook, St Leonards Creek, Susannah Brook (Swan River) and Southern River/ Wungong Brook (Canning River).
Toby Inlet – Quindalup Townsite.
Vasse-Wonnerup Estuaries, Broadwater & New River - Busselton Townsite.
Willyung Creek - Albany.
Yakamia Creek – Albany Townsite.
Glossary:
Annual exceedance probability (AEP) - the likelihood of occurrence 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 lifetime. 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 river overflows its banks during major river flows. The term also applies to land adjacent to estuaries 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 formerly known as FPM Map Index (DOW-033)
