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 uses Brisbane City Council's Open Spatial Data website to provide extra features for viewing and downloading the data. The first two resources in this dataset are labelled HTML and they each have a Go to button. Clicking a Go to button will open a web page in a new tab. The Go to button on the first resource will open our Open Spatial Data website that provides many features for viewing, interacting with, and downloading data. The Go to button on the second resource will open the ArcGIS REST Services Directory website and display the spatial metadata for the dataset. Most of our spatial datasets have four more resources. The four resources are labelled: CSV, GeoJSON, SHP, and KML, and all four have a Download button. Clicking the Download button on the CSV resource will download the attribute data in a table. Clicking the Download button on the GeoJSON, SHP or KML resource will download the data in a spatial file.
