Town of Mosman Park to still investigate ocean pool despite sea rise concerns

Whether to defend of retreat from sea rises will have to considered at Mosman Park Beach. Picture: Jon Bassett
Whether to defend of retreat from sea rises will have to considered at Mosman Park Beach. Picture: Jon Bassett

AN ocean pool is still being investigated for Mosman Park despite a warning in a new plan for sea rises at the beach in the next 100 years.

“We want a true, environmentally sustainable ocean pool in the ocean,” Mosman Park mayor Brett Pollock said.

At its Novembermeeting, Mr Pollock’s council adopted the Our Coastal Future: Port, Leighton and Mosman beaches coastal adaptation plan for sea rises, with key dates for action by 2030, 2070 and 2110.

The plan, conducted with City of Fremantle and including the port city’s Port and Leighton beaches, warned the area around the man-made cliff at Mosman Beach could be heavily impacted by sea rises by 2070.

“The erosion hazard risk area at Mosman Beach is significant because the width of the dune system and the elevation of the land behind mean that this section of the coast has reduced capacity to buffer and repair from erosion events,” the plan said.

It recommended that before 2030 the dunes should be stabilised by engineering down to the underlying limestone, extra sand is dumped on 620m of beach and dunes, and the beach is monitored for erosion; retreat from the sea’s encroachment may be need by 2070.

Planning would have to be flexible so infrastructure, currently comprising a carpark and Curtin Avenue, could retreat in the face of erosion and undermining of the foreshore, and the use of the land adjacent to any new coastline could easily be accommodated.

A staff report said the council already spent an average of $35,000 annually protecting the cliffs with dune stabilisation and re-vegetation.

Former Mosman Park mayor Ron Norris previously suggested the ocean pool could act as permanent protection against the rises as a piece of hard infrastructure.

However, the report said public comments gathered for the adaptation plan indicated greater community support for retreating from sea rises.

Mr Pollock said while the council’s initial investigations had made the idea of a pool more convincing, it did want to spend too much money on deciding its feasibility.

He said it wanted to quickly determine the pool’s potential before going to the State Government to seek funds in the new year.

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