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BMT WBM assist with a concept flood strategy for Newcastle
07-Jul-2009
BMT WBM has been assisting Newcastle City Council develop a flood strategy for the entire Newcastle Local Government Area. Using the results of several flood models, sophisticated GIS analysis was undertaken to demonstrate that about 22,000 properties across Newcastle are potentially flood liable, equivalent to one in three properties.
The modelling and analysis by BMT WBM confirmed that flood risk areas included virtually all of six Newcastle suburbs (Hamilton, Hamilton North, Wickham, Maryville, New Lambton and Hexham), and substantial parts of another 15 suburbs. Flood risks in Newcastle are particularly high as flash flooding can occur with little to no warning, potentially leaving thousands of people with no means of safe evacuation. Flash flooding of many areas across Newcastle occurred during the June 2007 event. Flood risks can also develop from flooding within the adjacent Hunter River (as occurred in 1955), and is also predicted as a consequence of future sea level.
A risk-based approach was used to identify those areas and suburbs considered at highest danger during flooding. These areas have been recommended for further consideration as part of a more detailed investigation to be completed by Council over the next 18 months. Preliminary assessment of potential flood management measures was undertaken by BMT WBM, with a focus on minimising ‘risk to life’ over the full spectrum of floods (up to the worst possible flood). Completely eliminating flood risks within Newcastle would cost in the order of $2 billion. Addressing only the most significant ‘risks to life’ would cost approximately $200 million, and would involve a combination of voluntary purchase, channel augmentation, structural strengthening of buildings, and creation of on-site refuges.
For further information please contact
Dr Philip Haines phaines@wbmpl.com.au