Quinns Rocks: City of Wanneroo favours fourth groyne

Quinns Rocks: City of Wanneroo favours fourth groyne

DESIGNS for $6.7 million worth of works on groynes in Quinns Rocks appear in a report scheduled to be considered by City of Wanneroo council tomorrow night.

The long-term coastal management report, which was presented to the council at the March 28 briefing session, includes detailed design prepared by consultant Cardno for a fourth groyne north of existing structures.

It recommends the City spend $2.2 million to build it in 2017-18 and extend the second groyne in 2018-19 for $2.8 million and the third in 2019-20 for $1.7 million.

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According to drawings attached to the report, extending the second groyne would require building a wider head in deeper water, hence the higher cost for it than the third or fourth groynes.

“The extended and additional groynes will enable additional sand to be trapped within the coastal compartments created by the groynes as the sand moves along the coast,” the April 4 report said.

It said that would result in “a wider beach and buffer against erosion events during winter storms”.

“This option also allows the City to maintain the existing Quinns Beach carpark which will assist in meeting the future parking demands for this popular section of coast,” it said.

“Coastal construction works will be staged over three years in order to limit construction to calm weather periods during the summer season, limit interruption to beach users and for budgeting requirements which will allow for annual funding submissions to the State Government.”

The City applied for State Government funding in December for the Quinns Beach long-term coastal management works and the recommendation seeks confirmation whether that will be provided.

The City’s long-term plan includes $2 million in 2017-18 and $1 million in 2018-19, plus $450,000 carried forward from this financial year, but no allocation in 2019-20.

The recommendation is to approve allocating an extra $1.8 million in 2018-19 and $1.7 million in 2019-20 from the City’s strategic reserves, plus seek more State funding.

It also asks staff to prepare submissions for the Transport Department’s Coastal Adaptation and Protection Grant program.

The measures, which included adding sand to the beach, aim to address ongoing coastal erosion issues in the area, most notably the partial collapse of Fred Stubbs Park in 2013.

The City undertook public consultation last year, which most submissions supporting the fourth groyne option rather than relocating the beach car park.

According to the report, Cardno had identified that a fifth groyne at Queenscliff Park was “unlikely to be necessary in the short to medium term”.

“Long term requirements of this additional fifth groyne will need to be confirmed through ongoing monitoring and beach maintenance activities such as beach re-nourishment north of the new groyne,” it said.

 

QUINNS ROCKS COASTAL WORKS

2017-18: build fourth 60m groyne and beach access ramp, sand renourishment. Costs $2.2 million.

2018-19: extend second groyne 45m, sand renourishment. Costs $2.8 million.

2019-20: extend third groyne 15m, sand renourishment. Costs $1.7 million.