Layer: Limited Data Reliability - 0.1 AEP Flood (ID:0)

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Name: Limited Data Reliability - 0.1 AEP Flood

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Description: Moreton Bay Regional Flood DatabaseRiver and Creek FloodingVersion 3.1.0 (October 2023)This theme shows river and creek flooding caused by long duration heavy rainfall, typically lasting between 1 hour and 1 day. Sometimes this rain falls over a whole catchment or a number of catchments. This extended period of heavy rainfall causes the water levels in the river or creek to rise and escape the main channel. It may take a number of hours or days for these floodwaters to rise, reach a peak and then subside. MethodologyCoupled hydrologic (WBNM) and hydraulic (TUFLOW HPC with MHWS downstrem boundary) modelling using a two-dimensional regular grid, 1D culvert structures, 2D bridge structures and a design rainfall approach based on ARR2019. Blockage calculated based on ARR2019 recommendations. Refer publications available from Council's website for further details.Existing Conditions Maximum ScenarioMaximum of modelled flood behaviour in rivers and creeks for different design rainfall events under existing climate and catchment conditions - with and without stucture (bridges and culverts) blockage.PurposeTo determine flood levels and flows for different design rainfall events for design of infrastructure with and without bridges and culverts being blocked by debrisMethodologyCoupled hydrologic (WBNM) and hydraulic (TUFLOW HPC with MHWS downstrem boundary) modelling using a two-dimensional regular grid, 1D culvert structures, 2D bridge structures and a design rainfall approach based on ARR2019. Blockage calculated based on ARR2019 recommendations. Refer publications available from Council's website for further details.Flood Data NotesDescribes the expected reliability of the flood data including indication of specific areas where Council is of the opinion that the data has limited reliability and a reason for this limited reliability.The notes polygon dataset stores spatial definitions of model areas of known lower data reliability or subject to review. Modelled ProbabilityThe probability represented by this dataset is:0.1% Chance of Flooding in Any One YearLikelihood: Unlikely Annual Exceedance Probability (AEP): 0.1%Average Recurrence Interval (ARI): 1,000 YearA very large and very unlikely flood event. Over a very long period of time an event of similar size may occur on average once every 1,000 years. Few people will ever witness an event of this size. When an event of this size is observed it is considered to be very exceptional. A river and creek flood event of similar size occurred in the middle reaches of the North Pine River during January 2011. Whilst very unlikely, it is possible for these events to occur.Version Notes3.1.0 - First edition of Generation 3 models, incorporating 2019 LiDAR, ARR2019 for Hydrology and TUFLOW HPC for Hydraulic modelling. All ARIs and all Aspects. (BCR 5yr, 10yr, 50yr and 2000yr runs completed by CMB). BYR and MAR no structure blockage only. MAR ARR hazard calculated using WaterRIDE. (October 2023)Version Resolution: 2.5mData Reliability: AIndicates the flood data is of the highest available standard and has been prepared using the most recent flood model and input data Edit HistoryNo edits recorded for this version.Further InformationFor additional information on flooding in the Moreton Bay Region please see Council's website: http://www.moretonbay.qld.gov.au/Services/Property-Ownership/Flooding

Copyright Text: City of Moreton Bay, 2025

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Last Edit Date: 4/9/2025 11:42:42 PM

Schema Last Edit Date: 4/9/2025 11:42:42 PM

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