Waves up to 8 metres have hit Collaroy on Sydney's northern beaches, crashing into beachfront properties and causing an in-ground swimming pool to collapse, as wild weather battered NSW.

About seven houses and a unit block were evacuated at Collaroy as a huge low pressure system moved over the state Sunday night, Inspector Jason Reimer said.

"One of the properties along that strip actually lost an entire in-ground pool which had moved about five metres out to sea," Inspector Reimer said.

http://www.abc.net.au/news/2016-06-06/nsw-weather-large-waves-hit-collaroy-coast/7479846

The question is why have a swimming pool so close to the beach?... Just looking at the picture, I would say the damage in Collaroy stands between 150,000 and 200,000 tonnes of soil and sand that have gone AWOL. Meanwhile:

Major flood warnings are in place for rivers in Tasmania, as the island state is hammered by a massive storm cell which caused chaos in Sydney

http://www.abc.net.au/news/2016-06-06/east-coast-storm-tasmania-sees-record-flooding-as-wild-weath/7482846

Global warming is real. Global warming is anthropogenic.

Every time a storm lashes Collaroy beach, residents worry it will be washed away.

This northern beaches coast – sufficiently famous to be included in the Beach Boys’ 1963 hit Surfin’ USA – is perhaps one of the state’s most studied coastal erosion sites. But with a La Nina event set to bring heavy rains, thunderstorms and strong swells this summer, it’s not just Collaroy Beach likely to see erosion.

The coastal strip was pummelled during a massive storm in 2016 that damaged homes and pulled a swimming pool into the ocean, costing homeowners and local government almost $25 million to fix. Another two big storms further eroded the sand dune in July last year.

Since then, residents, the council and the state government have been working to protect the properties and beach from storm surges, including building a seven-metre-high concrete wall. Once completed, at least three-quarters of the wall will be covered by sand.

The project stretches 1.3 kilometres from Collaroy to South Narrabeen, encompassing 49 private properties dotted with 11 public land areas, which include a car park and a surf club.

And the works have become the topic of local controversy, with some residents worried that the seawall will cause more harm than good, and sand directly in front of the wall could be washed away in the next storm.

Surfrider Foundation northern beaches branch president Brendan Donohue organised a protest yesterday to encourage the council to invest in other measures to protect the beach, including a nourishment plan that would artificially replace the sand. The local community group has been protesting against a seawall for almost 30 years.

‘‘Protective works are a far preferable measure to a vertical seawall,’’ he said. ‘‘The community is not happy.’’

Northern Beaches Council said there had been comprehensive community consultation about the council’s coastal zone management plan for Collaroy Beach.

Senior lecturer at the UNSW Water Research Laboratory Mitchell Harley said many of the erosion issues that Collaroy faces stem from poor planning almost 100 years ago. Many other coastal communities face similar legacy issues, with councils in desperate need of greater support to address contentious issues, he said.

‘‘There are a number of these places up and down the coast ... The lesson from that is, with climate change and sea level rises, there is an increase in pressures on the coasts,’’ he said.

‘‘We will see more and more of these issues come up, and so the important thing is that we don’t create additional legacy issues by poor planning decisions that we make today.’’

The La Nina weather pattern declared last week will add further pressure on many coastal communities, with cooler temperatures, rain and storm events likely to worsen erosion.

Dr Harley and his colleagues have been measuring the erosion on Collaroy for 45 years and found it was usually worse during La Nina. The team will be monitoring the beach through newly installed instruments to observe how weather systems affect beaches and seawalls.

‘‘Normally we get waves coming from the south or south-east. During La Nina events, they shift slightly anticlockwise, so they are more easterly,’’ Dr Harley said.

This means there’s a higher risk of more erosion, particularly over the coming summer, and also ‘‘beach rotation’’ – where the beach realigns itself to the prevailing wind direction, he said. This typically means the northern end of the beach gets narrower and the southern ends get larger.

A report by the Insurance Council of Australia, published this month, estimates the Australian government will need to invest $30 billion in large-scale coastal protection and adaptation projects over the next 50 years.

SMH 28 November 2021...

A few days ago, Gus was working on his weather predictions in accordance with the moon phases, tidal surges, jet streams, and the present La Niña event... The prognostic was a 50/50 chance of a repeat of the storm mentioned at top on/around the 21st of December 2021 (solstice). A Westerly low pressure merging with a northerly breeze, pushing the winds beyond 160 km/h (100 knots). Collaroy is only protected from the south... I could be wrong.

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