Murwillumbah CBD flood simulation video released
Council has published a video simulation of a flood in the Murwillumbah central business district.
The video shows that the three levees in Murwillumbah CBD protect the community in a range of flood events, but will be overtopped in extreme events.
The simulation of a 500-year average recurrence interval (ARI) flood, which means there is a 0.2 per cent chance of it happening in any year, shows the Murwillumbah CBD Levee overtopping near Murwillumbah High School after 22 hours of heavy rain in the catchment above the town.
Three hours later, after heavy rain has been falling for 25 hours, the residential area behind the Murwillumbah CBD Levee is under more than four metres of water. Residential areas behind the Dorothy/william Streets Levee are also under water up to four metres deep and the water is rising behind the East Murwillumbah Levee.
“The video graphically illustrates the protection limits of the levees and all residents are encouraged to watch the simulation and make their home emergency plans now as we are officially in storm season,” Council Chair of the Tweed Floodplain Management Committee Danny Rose said.
“In March 2017, the Murwillumbah CBD Levee began to overtop at the high school, but the heavy rain then stopped, saving the town from a truly catastrophic event.
“That flood in Murwillumbah was a 100-year average recurrence interval flood (that is a one per cent chance of it happening in any year) and for so many people it was devastating. We haven’t yet seen a 500-year ARI flood in Murwillumbah but it could happen.
“Council, the State Emergency Service and the Floodplain Management Committee are working hard to educate all Tweed residents on their flood risk and ensure that everyone knows their trigger to act to protect life and property.”
Watch the video at https://youtu.be/vaketztwngc or visit
Tweed Shire Council’s Youtube channel:
After 22 hours’ heavy rain in the catchment above Murwillumbah, the CBD Levee is about to be overtopped. If it continues to rain heavily for three more hours, the residential area behind the CBD levee will be under more than four metres of water.