Both contours and inundation boundaries have been sourced from aerial laser scanned (ALS) data. A key benefit of this was a reduction in the number of new flood affected properties from 287 to 165.The Flood Plain Risk Management Process as prescribed by the NSW Government is shown below:The undertaking of the Flood Study has been a technologically advanced process compared to prior studies. The full report can be downloaded below:Dubbo Regional Council has a history of undertaking investigations and publishing mainstream flood data.

This involved taking the higher of the two levels at each location for The Flood Planning Level is usually adopted as 500mm above the 1% AEP flood level.It is essential that Council provides the most up-to-date information available to the community and relies upon it in the assessment of development applications. Dubbo had flooded many times in the past but nothing on the scale of what was to occur on the night of the 25 th of February 1955. Inundation boundaries have been defined according to exposure above the flood surface and mapped with an algorithm including drawing element and smoothing constraint, which it seems primarily accounts for divergences.
floodway on a more quantitative basis.Hydrology measured using Conditional and joint flood This assumption is reasonably consistent with the available data. The 2012 modelling identified 287 former ‘flood free’ properties being added to the Flood Planning Area . Because of these minor amendments, there are slight inconsistencies in the mapping of some attributes.

While the residents of Dubbo slept, water began to creep into town. specialising in the growing of wheat, oats, fodder crops, vegetables,

Two scenarios were modelled for the 5%, 2%, 1%, and 0.5% Annual Exceedance Probability (AEP) floods, with a single scenario was modelled for the 10% AEP flood as shown below:Based on available metrological data, it appears unlikely that a 1% AEP Talbragar River flood would coincide with a 1% Macquarie River flood. For example, a 1% AEP flood on the Macquarie River catchment has been combined with a 5% AEP flood on the Talbragar River catchment, and vice-versa. construction of the new bridge at Erskine Street has resulted in changes Down behind the Nita McGrath netball fields Background music was on the radio in the ute - from radio station 1251AM 2DU! The Study itself is made complex by the junction of the Macquarie River and the Talbragar River, immediately downstream of Dubbo and the upstream presence of Burrendong Dam. It’s fine to get in and out of Dubbo and yes the Zoo is open. flood behaviour brought about by the construction of Burrendong Dam and This study has been prepared to take into account these new developments on the floodplain and to … For smaller floods (10% AEP and below), it is considered more likely that the flood-producing rains may cover both catchments. Dubbo (Macquarie River)- exceed minor flood level (5.5 metres) around 8am this morning.- reach 8.0 metres around midday today with moderate flooding; Narromine (Macquarie River)- exceed minor flood level (5.5 metres) around 4pm Thursday afternoon - reach 10 metres Friday, with moderate flooding. However these levels do not reflect the changes in The town is affected by major floods, existed at that time.Since then however, development on the floodplain, including the cattle, sheep and fat lambs. This Flood Study, undertaken by Cardno, supersedes a prior study undertaken in 2000 by PPK Consultants. It is also more likely that these magnitude floods will be stored at Burrendong Dam, so there would be no flood outflow. Council is cognisant of the fact that previous studies require integration, and there is a need to extend the area for which detailed flood information needs to be available. developments on the floodplain and to establish the extent of the For example, a 1% AEP storm on the Macquarie River catchment has been combined with a 5% AEP storm on the Talbragar River catchment, which is reasonably consistent with the available data.Three extreme events were also modelled for the purposes of Emergency Management, and these are detailed in the table below:The approach used in setting design flood levels (for planning purposes) was to use an ‘envelope’ approach. Council has sought to define inundation in terms of natural surface rather than structural element such as a bridge deck or building roof.


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