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Moreton Bay Regional Flood Database
Storm Tide Flooding
Version 2.1.0 (June 2015)
This theme shows potential flooding caused by abnormal increases in tide. Strong winds associated with a cyclone or intense low pressure weather system can push a raised mound of seawater, called a storm surge, onto the shoreline. This surge when combined with the astronomical tide and increased wave action is called a storm tide. Storm tide occurs in low-lying locations near the coast.
Methodology
Coastal (offshore) hydrodynamic modelling using a two-dimensional, curvilinear grid provided boundary conditions for the inundation modelling. Inundation from a Storm Tide even was dynamically model (Delft3D) including offshore and nearshore waves and the model included culverts, bridges and drainage pipes. Refer technical publications available from Council's website for further detail.
Existing Conditions Cyclonic Scenario
Modelling a storm tide under existing climate conditions - cyclonic activity.
Purpose
To describe existing flood behaviour during a storm tide caused by cyclonic activity.
Methodology
Coastal (offshore) hydrodynamic modelling using a two-dimensional, curvilinear grid. For this scenario an increase in average wind speed of 10% is assumed. A bathtub approach has been used to extrapolate the model results onto the landward side of the coastline. Refer technical publications available from Council's website for further detail.
Flood Data Notes
Describes 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 Probability
The probability represented by this dataset is:
5% Chance of Flooding in Any One Year
Likelihood: Likely
Annual Exceedance Probability (AEP): 5%
Average Recurrence Interval (ARI): 20 Year
A 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 Notes
2.1.0 - TUFLOW modelling with a dynamic Storm Tide boundary (June 2015)
Version Resolution: 2.5m
Data Reliability: A
Indicates the flood data is of the highest available standard and has been prepared using the most recent flood model and input data
Edit History
No edits recorded for this version.
Further Information
For additional information on flooding in the Moreton Bay Region please see Council's website:http://www.moretonbay.qld.gov.au/Services/Property-Ownership/Flooding
Moreton Bay Regional Flood Database
Storm Tide Flooding
Version 2.1.0 (June 2015)
This theme shows potential flooding caused by abnormal increases in tide. Strong winds associated with a cyclone or intense low pressure weather system can push a raised mound of seawater, called a storm surge, onto the shoreline. This surge when combined with the astronomical tide and increased wave action is called a storm tide. Storm tide occurs in low-lying locations near the coast.
Methodology
Coastal (offshore) hydrodynamic modelling using a two-dimensional, curvilinear grid provided boundary conditions for the inundation modelling. Inundation from a Storm Tide even was dynamically model (Delft3D) including offshore and nearshore waves and the model included culverts, bridges and drainage pipes. Refer technical publications available from Council's website for further detail.
Existing Conditions Cyclonic Scenario
Modelling a storm tide under existing climate conditions - cyclonic activity.
Purpose
To describe existing flood behaviour during a storm tide caused by cyclonic activity.
Methodology
Coastal (offshore) hydrodynamic modelling using a two-dimensional, curvilinear grid. For this scenario an increase in average wind speed of 10% is assumed. A bathtub approach has been used to extrapolate the model results onto the landward side of the coastline. Refer technical publications available from Council's website for further detail.
Flood Data Notes
Describes 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 Probability
The probability represented by this dataset is:
1% Chance of Flooding in Any One Year
Likelihood: Possible
Annual Exceedance Probability (AEP): 1%
Average Recurrence Interval (ARI): 100 Year
A large uncommon flood event that is rarely observed but neverthess still possible. Over a long period of time an event of similar size may occur on average once every 100 years. It is therefore likely an event of this size will occur at least once during a single lifetime. It is less likely, but still possible, for a flood of this size to occur more than once in a single lifetime. A flood event of similar size occurred in the middle and upper reaches of the Caboolture River during January 2011.
Version Notes
2.1.0 - TUFLOW modelling with a dynamic Storm Tide boundary (June 2015)
Version Resolution: 2.5m
Data Reliability: A
Indicates the flood data is of the highest available standard and has been prepared using the most recent flood model and input data
Edit History
No edits recorded for this version.
Further Information
For additional information on flooding in the Moreton Bay Region please see Council's website:http://www.moretonbay.qld.gov.au/Services/Property-Ownership/Flooding
Moreton Bay Regional Floodplain Database
Storm Tide Flooding
Version 2.1.0 (June 2015)
This theme shows potential flooding caused by abnormal increases in tide. Strong winds associated with a cyclone or intense low pressure weather system can push a raised mound of seawater, called a storm surge, onto the shoreline. This surge when combined with the astronomical tide and increased wave action is called a storm tide. Storm tide occurs in low-lying locations near the coast.
Methodology
Coastal (offshore) hydrodynamic modelling using a two-dimensional, curvilinear grid. A bathtub approach has been used to extrapolate the model results onto the landward side of the coastline. Refer technical publications available from Council's website for further detail.
Existing Conditions Cyclonic Scenario
Modelling a storm tide under existing climate conditions - cyclonic activity.
Purpose
To describe existing flood behaviour during a storm tide caused by cyclonic activity.
Methodology
Coastal (offshore) hydrodynamic modelling using a two-dimensional, curvilinear grid. For this scenario an increase in average wind speed of 10% is assumed. A bathtub approach has been used to extrapolate the model results onto the landward side of the coastline. Refer technical publications available from Council's website for further detail.
Flood Data Notes
Describes 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.
rfdRepresentationDescription
Modelled Probability
The probability of flooding represented by this dataset is:
0.1% Chance of Flooding in Any One Year
Likelihood: Unlikely
Annual Exceedance Probability (AEP): 0.1%
Average Recurrence Interval (ARI): 1,000 Year
A 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 Notes
2.1.0 - TUFLOW modelling with a dynamic Storm Tide boundary (June 2015)
Version Resolution: 2.5m
Data Reliability: A
Indicates the flood data is of the highest available standard and has been prepared using the most recent flood model and input data
Further Information
For additional information on flooding in the Moreton Bay Region please see Council's website: http://www.moretonbay.qld.gov.au/floodcheck/