Description: Moreton Bay Regional Floodplain DatabaseRiver and Creek FloodingVersion 2.5.0(June2015)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) modelling using a two-dimensional regular grid, 1D culvert structures, 2D bridge structures and a design burst rainfall approach. Refer technical publications available from Council's website for further detail.Existing Conditions ScenarioModelled flood behaviour in rivers and creeks for different design rainfall events under existing climate and catchment conditions.PurposeTo determine flood levels and flows for different design rainfall events for design of infrastructure.MethodologyCoupled hydrologic (WBNM) and hydraulic (TUFLOW) modelling using a two-dimensional regular grid, 1D culvert structures, 2D bridge structures and a design burst rainfall approach. Refer technical publications available from Council's website for further detail.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 of flooding represented by this dataset is:5% Chance of Flooding in Any One YearLikelihood: Likely Annual Exceedance Probability (AEP): 5%Average Recurrence Interval (ARI): 20 YearA small flood event that may be observed from time to time. Over a very long period of time an event of similar size may occur on average once every 20 years. Although unusual, an event of this size can occur more frequently. It is likely an event of this size will occur more than once during a single lifetime. The river and creek flood event that occurred in the middle reaches of Burpengary Creek during May 2009 was similar in size to this event.Version Notes2.5.0 - Notes updated to reflect updated modelling (June 2015).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 Further InformationFor additional information on flooding in the Moreton Bay Region please see Council's website: http://www.moretonbay.qld.gov.au/floodcheck/
Copyright Text: Moreton Bay Regional Council, 2014