This dataset, created in June 2013, provides an indication of the likelihood of a flood occurring from creeks inside the Brisbane City Council local government area. This layer contributes to the overall Flood Awareness Map.
Creek flooding occurs when intense rain falls over a creek catchment. Runoff from houses, streets, parks etc contributes to creek flooding. Once the capacity of the creek is reached, overtopping of the banks will occur which can cause flooding. Creek floodwaters can be very fast moving and rise and recede quickly without much warning.
There are four different creek flooding likelihood areas in Flood Awareness Map, namely High, Medium, Low and very low.
The creek High likelihood layer consists of a combination of the 5% Annual Exceedance Probability (AEP) (20 year Average Recurrence Interval (ARI)) from BCC’s flood inundation extents usually utilising the surfaces produced as part of a Flood Study where available and the remaining areas from the 5% AEP (20 year ARI) delivered as part of the Citywide Flood Awareness Mapping study (Worley Parsons, 2012).
The creek Medium likelihood layer consists of a combination of the 1% AEP (100 year ARI) from BCC’s flood inundation extents (outside high likelihood area) usually utilising the surfaces produced as part of a Flood Study where available and the remaining areas from the 1% AEP (100 year ARI) delivered as part of the Citywide Flood Awareness Mapping study (Worley Parsons, 2012).
The creek Low likelihood layer consists of a combination of the 0.2% AEP (500 year ARI) from BCC’s flood inundation extents (outside high likelihood area) usually utilising the surfaces produced as part of a Flood Study where available and the remaining areas from the 0.2% AEP (500 year ARI) delivered as part of the Citywide Flood Awareness Mapping study (Worley Parsons, 2012).
The creek Very Low likelihood layer consists of a combination of the 0.05% AEP (2000 year ARI) from BCC’s flood inundation extents (outside high likelihood area) usually utilising the surfaces produced as part of a Flood Study where available and the remaining areas from the 0.05% AEP (2000 year ARI) delivered as part of the Citywide Flood Awareness Mapping study (Worley Parsons, 2012).
