Mur­willum­bah CBD flood sim­u­la­tion video re­leased

Tweed Daily News - - NEWS -­shire­coun­cil

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 at­ztwngc 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.

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