Queensland floodplain assessment overlay

Identification

Title : Queensland floodplain assessment overlay
Alternative title : Floodplain assessment overlay
Date : 2013-10-17 ( publication )
Related resource:

Identifier: NAT.QLD_FLOODLINES/NAT.QLD_FLOODPLAIN_ASSMT_OVERLAY
Relationship to related resource : source

Description

Abstract / Description:

The Queensland Floodplain Assessment Overlay (QFAO) map layer identifies potential floodplains that may be at risk of inundation from riverine flooding. However, it is not intended to predict riverine flooding for specific land parcels. The map was created through an analysis of drainage patterns using data such as 10-meter contours from the best available elevation models, historical flood records, vegetation and soils mapping, and satellite imagery, rather than a specific flood modelling approach. This data serves as an interim assessment to help Local Government Authorities identify areas that may need further refinement.

Purpose:

This data serves as an interim assessment to help Local Government Authorities identify areas that may need further refinement. It is not intended to predict riverine flooding for specific land parcels.

Additional Information:

The map was created through an analysis of drainage patterns using data such as 10-meter contours from the best available elevation models, historical flood records, vegetation and soils mapping, and satellite imagery, rather than a specific flood modelling approach. This data serves as an interim assessment to help Local Government Authorities identify areas that may need further refinement.
As background, the Queensland Floodplain Assessment Overlay mapping was commenced in 2012 and completed in 2013 as an interim solution to:
• identify potential floodplains over the whole of Queensland
• provide an interim assessment to help communities decide priorities for more detailed flood investigations.
At the time of completion, the QFAO was the largest mapping exercise underway in Australia, however it was always intended to be an interim solution to provide a conservative estimate for communities of where more detailed flood mapping and studies may be required, recognising the time and cost required to prepare the more detailed flood mapping and studies.
In areas where detailed flood modelling assessments (e.g., flood investigations with a sub-basin approach, flood risk management studies, and implemented floodplain management plans) have been undertaken the QFAO is superseded. As local governments increase their levels of maturity with more detailed flood mapping and flood studies, it is likely the QFAO may be superseded across many areas of Queensland.
In council Flood Awareness Maps, where the QFAO map layer is shown, it should be noted that the QFAO shows the potential extent of the floodplain and does not indicate that an individual land parcel is subject to inundation. The QFAO should be viewed alongside historical flood data map layers where this information is available.
For more details about the QFAO and flood risk in your local area please contact your council.

Language : eng
Character set : unknown

Topic

ISO topic category codes: inlandWaters

Spatial Data Information

Spatial representation type : vector
Coordinate Reference System EPSG code: EPSG:4938

Title : EPSG Geodetic Parameter
Dataset
Date : 2007-07-16 ( revision )
Edition : Version 6.13

Spatial resolution:

Equivalent scale: 1 : 100000

Contacts

Point of contact :

Organisation : Department of Natural Resources and Mines, Manufacturing and Regional and Rural Development
Address:

Email: opendata@resources.qld.gov.au

Owner :

Organisation : Department of Natural Resources and Mines, Manufacturing and Regional and Rural Development

Status

Progress status : completed
Maintenance and update frequency : asNeeded

Data / Resource Constraints

Resource Access Level : -->

Security classification (ISO 19115) : unclassified

Copyright : (as use constraint)

Licence : (as use constraint)

This material is licensed under a Creative Commons - Attribution 4.0 International licence.

The Queensland Reconstruction Authority requests attribution in the following manner:
© State of Queensland (Queensland Reconstruction Authority) 2023. Updated data available at http://qldspatial.information.qld.gov.au/catalogue// .

Temporal and Spatial extents:

Bounding box:

West bounding longitude : 138.2241
East bounding longitude : 154.2042
South bounding latitude : -29.0873
North bounding latitude : -8.0812

Temporal extent:

Start: 2012-03-28 End: 2013-10-17

Data Quality

Data quality scope:

Level : dataset

Positional accuracy (external, absolute):

This is a composite dataset derived from layers of various scales.

History:

Lineage statement:

The Queensland Floodplain Assessment Overlay has been captured by analysis and visual interpretation of a combination of datasets (listed below in Sources).

Process step:

1. Identify and overview sub-basin with satellite imagery backdrop.2. Overlay ordered drainage and floodplain data.3. Analyse drainage lines within the basin to determine the drainage lines that are relevant. At a minimum drainage lines with order 1 and 2 are excluded unless known events have occurred.4. Having determined the approximate extent in terms of drainage line hierarchy, overlay the 10m contours, gauging stations and flood lines of actual events from 2011.5. Determine the approximate flood elevation at locations within the drainage basin using gauging station data and actual events, together with visual interpretation of the imagery and other layers.6. Delineate the extent of the floodplain by visually interpolating between known locations using the satellite imagery and contours as the guide.
Flood extent line revised over the town of Mareeba in the Barron River Basin sub area on 17-10-2013.

Source:

1. 10m contours derived from 1 second SRTM (Shuttle Radar Topography), photogrammetry and LiDAR. In general, coverage of SRTM derived contours is west of the Great Dividing Range, Photogrammetrically derived contours coverage is over the Great Dividing Range and Cape York, LiDAR Contour coverage is the coastal fringe extending south of Cairns to the NSW border;2. Floodplain boundaries - derived by combination of Pre-clear Vegetation Mapping of Landzone 3 (Alluvium), Landzone 1 (Estuarine) and SALI Soil Flooding Limitation Mapping;3. Ordered Drainage (drainage lines);4. January 2011 Flood gauge readings and delineation of flooding events from aerial photography;5. 2009 SPOT satellite imagery;6. 2009 LandSAT satellite imagery.

Distribution

Format(s):

Name/identifier : Queensland Spatial Catalogue
Specification : Download Service
Online resource:

Website: http://qldspatial.information.qld.gov.au/catalogue//

Ordering information:

Fees : 0
Instructions : This data is available From Queensland Spatial Catalogue web site.

Format(s):

Name/identifier : downloadableData
Version : 10.0
Specification : ESRI ArcGIS Server Geoportal Extension Content Type

Distributor:

Format(s):

Name/identifier : From the Queensland Spatial Catalogue available as ESRI Shape file SHP, MapInfo Tab file TAB, ESRI file geodatabase FGDB, Google file KMZ, and Geopackage version 1.0, 1.1, or 1.2 file GPKG

Transfer size (megabytes) : 29
Online resource:

Website: http://qldspatial.information.qld.gov.au/catalogue/custom/search.page?q=%22Queensland floodplain assessment overlay%22

Transfer options:

Online resource:

Website: Function : download

Web Service Finder:

Website: QSpatial Web Service

Instructions: Use the URL to search QSpatial for web services displaying or using this dataset.

Metadata Reference Information

Hierarchy level (scope of the metadata) : dataset
Identifier : {B7E40FF2-8B30-E09F-BC7B-15C853793CE2}
Parent identifier : x
Metadata date stamp: 2012-05-17
Language : eng
Character set : utf8
Metadata standard name : ISO 19115:2005, ANZLIC ISO 1.1
Metadata version name : QGIS