Well now we know who is responsible for this debacle. I'm not entirely sure, but one of the reasons why an offshore reef structure hasn't been considered for Narrabeen may be because it's part of the Northern Sydney Protection Zone, hosting submarine cables that connect Australia to various parts of the Pacific (including Japan). But unlike a rock revetment at Stockton, which gradually collapses into the beach, Collaroy's sheer concrete wall relies on deep foundations to stabilise it. A number of properties along the oceanfront from Narrabeen to Collaroy were seriously endangered by erosion during a large storm swell in 2016. Here are the bloke credentials Surely, private properties can be protected but public amenities will require huge ongoing costs to keep up with the public requirement (sand nourishment is the first thing that comes to mind). Both Donohoe and Gorden were correct, up to a point: The construction began with concrete piles sunk six metres below sea level, protected by a rock toe. Luckily these sections of the Roads are at the far inside of pointbreaks so the wave energy is mostly weak, with little rebound affect. Having said that, nature usually finds a way to overcome most "permanent" human structures, and they often seem to forget that the wall isn't continuous.yet. Plenty others have discussed it. Isn't an extension to the Point Cartwright breakwall on the cards aa well? https://nationalprecast.com.au/wp-content/uploads/2015/06/Collaroy-Beach 2020 Surfer keelhauled by Collaroy Stormwater Pipe {RIP} I saw the construction going in, says Donohoe of seeing the area cordoned off earlier this year, and thought they were building rock revetments. Old bathing boxes which were on long piers sitting out in the bay are now sitting in the middle of sand dunes. Dates announced for Spencer Frost and Guy Williment's film shot in Russia's far east. besides Id rather just shout at my computer. If the council are desperate to get a liability off their books then they have totally screwed it. Installing the Pilings is the fourth step. And the properties either side?? In Japan, their solution is to just go bigger and higher . Im presuming that sand delivery's from the lagoon will be an ongoing thing. It's like companies using buybacks in a crisis. As mentioned in an earlier post, I place the blame fair and square at coastal engineers who design and approve these ill-fated designs. People need to be absolutely on top of the approval process in their local area if they want to have a hope of preventing these structures. Surely going to get all crazy reverb and backwash stripping their sand more rapidly as well. The GOR situation is far more complicated than Willi's well-intentioned advice makes out. Council and State Government contribute 10% each. Now a 7 metre-high, concrete, vertical seawall has been built in front of private properties on Collaroy/Narrabeen beach. If they approached the landowners then the most they would be offered is market value. We had made a big mistake that would become bigger. If he is an expert and this is what he designed, then I shudder to even imagine what the non-expert coastal engineers would design. the hardest decisions should be the easiest. "The only feasible way forward without wasting any more council and tax payers money to protect the properties in question is to acquire the properties at any cost and return them to a naturalised stated." My understanding was that council were looking at a rock revetment as they'd given approvals to a couple of other DAs for rock revetments, says Gordon. But thats about it . as my old mate hutch likes to say. The road is the public asset to be protected yes linked to their actions - but if it was really only just about PW road then surely a more cost effective way would have been to introduce less expensive and arguably more effective measures as I understand earlier reports have indicated including reveg and rock? It shows how different combinations of coastal defences and wave and tide conditions affect overtopping and flood risk. The public should not suffer loss of amenity or pay the costs to protect it. If a construction like that ends up being the only realistic option then so be it, but at least they need to be transparent about how they got to that point, and ideally accountable in future if it goes south. Collaroy sea wall. You wouldn't accept that in a bridge from an engineer, so why accept it in anything else? Engineered to Australian Standards. Here's also the appendices and figures etc: https://files.northernbeaches.nsw.gov.au/sites/default/files/collaroy-na Yeah, cheers I've been through them as well. [ask GaryG] I guess that makes offshore options quite limited, So I'm a little confused as to why there are hardly any real solutions put forward to deal with coastal erosion in 2021, despite our huge body of scientific knowledge regarding the issue. Spot on. You said "They get paid to do what they are told to do" Were they told told to design a system that would not work for the purpose and only exacerbate the problem? Great article.. https://www.smh.com.au/property/news/coastal-properties-at-highest-clima @Craig This is not a defence of the structure or the owners, just recognition that the protection of the main north south artery on the northern beaches was a factor. and who can afford to pay the rates and any rate increases due to sea wall construction costs, which will leave rate payers on low and middle incomes moving toward rather than away from poverty. Get Pro. Rock barrels at its best! Im not trying to be a dick about it. At what point do we put an end to this insanity. Highly unlikely! It's been seven years since the last, but the event has been called on off for this Wednesday - Hawaiian time. Men sand-bag properties on Collaroy Beach Arlington Building and a run of houses to the north circa 1922. Wherever there's a seawall the sand/beach washes away and makes it virtually impossible to enter or exit the water, not to mention the impact on the birdlife, fish and crustaceans that depend on the seasonal sand flow that comes with a healthy beach. consultant reports and community consultation no doubt funded by state money. I'm a huge tree-hugger but they will not stop powerfull ocean waves. But if I get burnt out, then someone's going to be held to account"! As far as I know their job was to asses the designs given to them by the Coastal engineers, not to actually create any designs. https://files.northernbeaches.nsw.gov.au/sites/default/files/collaroy-na Collaroy Stormwater Pipe Outlet Plop! Certain death. governments recently built a bunch of groynes around the Murray street area. It would be a good idea to put in a surf cam in that pans up and down the wall to document any changes to the beach, sand movements, erosion problems etc. The problem is one of vertical fiscal imbalance. I posted links to the relevant council pages in the previous story. Northern Beaches councils have been sacked for dodgy dealing twice before. Hopefully there's someone with deep pockets able to go after the truth of the matter. Nobody there is in a position to offer 2-3 times market value. The engineers would have likely argued against this for the reasons given above (and then some). Both!! That's appalling if it's the case, BB. Our services included: Pre-Work Detail Survey for existing surface levels at design chainages. Therefore, the group of Narrabeen and Collaroy residents are not successful in addressing the issue of coastal erosion. The market knows this. Why would you bother acquiring the affected properties "at any cost", when they're likely to be washed into the sea? Lawsuit waiting to happen when a swimmer/surfer gets nailed by a rogue piece of concrete either down the 'Roy or up towards Northy. Section 2.4 Item 4 - classic stuff. Gold Coast City Council had a similar problem to Collaroy at Palm Beach Qld. That's so shithouse I don't know where to start, Zen. The politicians and land owners actions are an entirely separate discussion and I'm not entering into that minefield! The people responsible for awarding the contracts get huge kickbacks. However, the work then continued skyward with a seven metre vertical concrete wall on top of the foundations. Or boarding a jumbo jet to go for a surf and buy the latest board all things responsible for the needing of the wall in the first place. More than likely entombed in one of those tetrapod molds you mentioned above. That's the only thing stopping all the sand at the base of the wall getting washed away. It is worth remembering that this council, as Warringah, council, was twice dismissed for corruption and incompetence. Brendan Donohoe says the . Donohoe has presided over the Northern Beaches branch of the Surfrider Foundation for over twenty years, and hes currently livid with the council. Thats awesome. How was Collaroy Beach made? Hey there - well I live in Noosa, Sunshine Beach specifically. Craig - we are expecting you to be down there at High Tide 11pm tonight with your Torch and Box Brownie for some more pics, Nah wait 'til tomorrow mornings high. gsco, I'd have thought that the first hurdle for any enhancement - besides the environmental impacts - would be the issue of access and whether the investment creates something with the most benefit for the most people. Yep, prevents over-topping but how's the reflection and enhanced rebound wave back into the surf zone!? Both Brendan Donohoe and Angus Gordon, and other people Swellnet spoke to, admit to being blindsided by the construction. and the sick irony of the beach access sign detailing the seawall works with all "enquires to be made I definitely disagree with a buy back. Only thing that would be better if they made a foot path on top of it so wheel chair bandits and a like get to use the cost line as well, "Or boarding a jumbo jet to go for a surf and buy the latest board all things responsible for the needing of the wall in the first place.". Among many objectives, it outlines how people living in threatened property might defend their homes. And I previously worked in a firm that did work in this area (it's not my specific expertise but I get the broad concepts). There are some fed govt areas that listen to this thinking. Fight the good fight mate. When a hard structure is introduced to the equation we see an increase in reflective energy andturbulence, slowing the accretion of sandwhile also acceleratingerosion in storm conditions. This widely publicized protest was an attempt to promote a pro-democracy, civil liberty, social justice message, and to protest against corporate greed and economic inequality. And more recently there was a local magazine piece discussing future sea level rises and the Noosa beach rock wall not being able to contain that, plus the homes along the Sunshine Beach to Peregian Beach stretch being at future risk, and councils would be needing to address that. When deciding to spend rate payer dollars, on what metric do they use without using the big IF ? Unfortunately, what we see in Collaroy might become a norm to protect this lifestyle. Has any one ever suggested an off shore reef, seems like a win-win or is the sea floor unsuitable? Not much wriggle room for negotiation, and in a volatile market owners are more liable to be offered (and it's an offer they can't refuse) recompense that sits at the lower end of the scale. Could be some good entertainment next time some serious swell hits. The activism of Tom Kirsop is legendary and in December 2019 Northern Beaches Council honoured him with a park at Narrabeen called Surfrider Gardens. Apologies for misreading you. Collaroy Sea Wall Client: Citilink Piling With such close proximity to the ocean, our client tasked us with producing an alternative to the commonly used polystyrene forms. check out the beach erosion in Apollo bay as well The erosion at Collaroy/Narrabeen Beach is not particularly significant, unusual or surprising. The local community group has been protesting against a seawall for almost 30 years. Make his name famous: Peter Horton. 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