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Flood — Awareness — Overland Flow — Overall — 1 Percent Annual Chance

This dataset, created in June 2013, provides an indication of areas subject to overland flow flooding inside the Brisbane City Council local government area.

The overall overland flow layer consists of the 1% Annual Exceedance Probability (AEP) (100 year Average Recurrence Interval (ARI)) flood extent sourced from the Citywide Creek and Overland Flow Path mapping study (GHD, 2017).

High impact area:

In high impact areas, overland flow is almost certain to occur during a single lifetime (70 years). An event of this size or larger has a 5% chance of occurring in any year. The overland flow is generally unsafe for people, vehicles and buildings.

Medium impact area:

For the majority of medium impact areas, overland flow is very likely to occur during a single lifetime (70 years). An event of this size or larger has a 2% chance of occurring in any year. The overland flow is generally unsafe for people, vehicles and buildings, however these hazards are experienced less frequently than in high impact areas.

Low impact area:

For the majority of low impact areas, overland flow is likely to occur during a single lifetime (70 years). An event of this size or larger has a 1% chance of occurring in any year. The overland flow is generally safe for people, vehicles and buildings; however, certain areas can experience greater hazards.

This dataset utilises Brisbane City Council's Open Spatial Data website to provide additional features for viewing and downloading the data.

The first resource is in HTML format. The GO TO button will launch our Open Spatial Data website and this will let you preview the data and enable additional download options. The resources labelled GeoJSON, KML and SHP will give you a download of the entire dataset. The ArcGIS GeoServices REST API resource connects to metadata for the layer while the CSV resource will download attribute data in a table.

Data and Resources

  • Flood — Awareness — Overland Flow — Overall — 1 Percent Annual Chance — ArcGIS Hub Dataset

  • Flood — Awareness — Overland Flow — Overall — 1 Percent Annual Chance — ArcGIS GeoService

    ArcGIS GeoServices REST API

  • Flood — Awareness — Overland Flow — Overall — 1 Percent Annual Chance — GeoJSON

  • Flood — Awareness — Overland Flow — Overall — 1 Percent Annual Chance — CSV

  • Flood — Awareness — Overland Flow — Overall — 1 Percent Annual Chance — KML

  • Flood — Awareness — Overland Flow — Overall — 1 Percent Annual Chance — Shapefile

Additional information

Field Value
Date Published 26/10/2021
License Creative Commons Attribution 4.0
Creative Commons Attribution 4.0
Attribution See resource preview