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 contains the location of levee banks (polylines) that mitigate the risk of flooding to the community and reduce potential property damage during major flood events.
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:
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Avon River - Northam Townsite.
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Capel River - Capel Townsite.
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Cohn Creek - merredin Townsite.
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Corrigin Townsite.
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Exmouth Townsite.
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Five Mile Brook - Bunbury Townsite.
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Gascoyne River - Carnarvon Townsite.
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Greenough River – Indian Ocean to Walkaway.
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Serpentine River - North of Lake Amarillo.
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Vasse-Wonnerup Estuaries, Broadwater & New River - Busselton Townsite.
Glossary:
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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.
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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.
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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.
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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 Levee Banks (DOW-034)
