With large swells and high tides occurring across our beaches, some residents are asking questions about Collaroy.

We spoke to expert coastal engineer, Peter Horton, about the current situation and the coastal protection works he designed to protect the properties from large and powerful surf.

Mr Horton said there has been some very minor erosion at Collaroy/Narrabeen Beach this week, along with other NSW beaches, but it is not a cause for concern.

“This is associated with above-average wave heights related to Tropical Cyclone Seth and also elevated ocean water levels associated with very high tides,” Mr Horton said.

“The erosion at Collaroy/Narrabeen Beach is not particularly significant, unusual or surprising. There is no evidence whatsoever of accelerated erosion seaward of these newly constructed works.”

Mr Horton said current conditions have exposed a temporary rock bund that was put in place to protect the construction site, but it will be removed when works are complete.

“It's only a temporary feature. The contractor is required to remove this temporary working platform and bund at the completion of the works, sieve the sand and remove all debris, and return the beach to its former state.”

He said when the work is complete, sand will be pushed up to cover most of the seawall.

For more information about the Collaroy seawall see our frequently asked questions.