Work begins on Maroochy Groyne Field Renewal
  • Monday 20 April 2020

Work is underway on the Maroochy Groyne Field Renewal project to help maintain and protect the Cotton Tree coastline from erosion, after some sections of the existing structures were identified for renewal. 

The groyne will be renewed with geotextile containers, also known as geobags or geofabric bags which are filled with sand, and placed perpendicular to the shoreline to interrupt wave action, capture sand and provide an erosion buffer.

Sunshine Coast Council Coastal Engineer Georgia Keeshan explained the entrance to the Maroochy River naturally migrated due to coastal and estuarine movements.

“In 1990 the river entrance migrated south which caused erosive pressure at the Cotton Tree Holiday Park. In response, in 2003, council constructed a number of groynes and sections of seawall to help protect the much loved holiday park and adjacent shoreline,” Ms Keeshan said.

“Extensive community consultation as well as significant research has been undertaken into the best and latest technology in developing the renewal project.

“Our innovative coastal team worked closely with industry specialists including researchers, container manufacturers and engineers from the Water Research Laboratory at the University of New South Wales, before testing the different types of design structures that could be utilised on-site at Maroochydore.”

Stage one of the project will focus on renewing the northern-most groyne structures (Groyne #3 and Groyne #4), along with the seawall surrounding Cotton Tree Holiday Park.

Where possible, community access will be maintained to the beach and river in dedicated ‘safe zones’ throughout construction only for those residents exercising during the novel coronavirus (COVID-19) pandemic.

Work started today (Monday 20, April) and is expected to wrap up in September – depending on weather and tidal conditions. Delays may also result from the COVID-19 pandemic, for information regarding council and COVID-19 visit council’s website

“The process is quite interesting,” Ms Keeshan said. “The sand used to fill the new geotextile bags will be sourced directly next to the work site and the sand from the old geotextile bags will be used to replenish the beach.

“Council will continue to liaise directly with the holiday park management team and community throughout the project to ensure concerns will be addressed and also have a water quality monitoring program in place.

“I thank the community’s ongoing support and commitment over the years to find an agreeable solution to ease erosion around this fantastic area.”

This renewal project has been a long time in the making, a result of extensive council planning, including a 10-year Shoreline Erosion Management Plan developed in 2014.
Stage two of the project will take place in 2021 and will focus on the two southern-most groyne structures. (Groyne #1 and #2).