btw- that one is a tiddler compared to what they have here. Northern beaches residents have been worried about how their beloved beach would fare when large swells and high tides hit the controversial Collaroy seawall. Indeed. Google "End-wall effect erosion" and you'll find many papers/studies on this. You would never be allowed to build an incorrectly designed bridge, so why do these people get away with doing that at our beaches ? The Gold Coast has undoubtedly the most at risk coastline in Australia. Construction costs are 80% homeowner funded. Cyclonic activity isnt forecast to increase at all - I think the jury actually out on that at the moment, east coast of Australia in a 500 year dip too on cyclonic activity. I've written about it before but the real reason here is money- it is massive pork-barreling on an unprecedented scale. 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.". A horizontal reef is also a "Hard Structure" yet it acts in a very different way to a Vertical Sea Wall such as the Collaroy one. The seawall is probably built over them. Nothing can ever excuse extremely poor and ill-conceived designs. No-one wants to see visible structures built along the beachfront. Please please please don't let those greedy fucks do this to Australia. >>Really dumb idea. Willi, how would easterlies impact the Great Ocean Road coast? Some family recently went through this as their house sat above the construction zone for the Spit / Northern Beaches Link tunnel. And as I said in my first comment that is because of the road. Some investigative journalism required to obtain all the council documents around its approval process. Its like something out of a dystopian movie. Perhaps at best, the council acquires the land and owners get a sum to relocate to a 'normal' house west of Pittwater Road (god forbid). I am looking at it but there is probably someone better qualified out there. Between these three, you can protect any shore from water erosion. Kimura (2016) "When a seawall is visible: Infrastructure and obstruction in post-tsunami reconstruction in Japan" "Environmental vandalism or gross negligence?". (As we all know, unfortunately, money/wealth/property seems to be many people's priority, and corrupt opportunists step in to "help" with that). I can't believe that those structures have been built in 2021 and that the legislation still hasn't been amended to counter the property rights of the owners. Its all about the squeaky wheel. The finished work is 100 metres long by 13 metres high. Make his name famous: Peter Horton. @dawnperiscope Ignorant clown" when roads and buildings are about to fall into the sea. Both!! Mentioned in a previous article (linked below) - the region hosts submarine cables, so it's part of the Northern Sydney Protection Zone. The also don't grow in sand so they won't be of any use to prevent coastal erosion on our open-ocean beaches. The council now will not release the relevant documents without a formal application and even then would no doubt find reasons to withhold the significant parts. The reef/sand nourishment are both mainly designed to widen and protect the public property, ie the beach, in front of the buried seawall. They also recently dug the mother of all holes in the sand and put huge foundations down ( well over a years work) for what I thought was further erosion work but turn out to be a access ramp for beach who cant step down onto the beach. as the article states coastal erosion has been known since the 20s in that area and has been studied meticulously ever since. At what point do we put an end to this insanity. Ive already done some research but the swellnet knowledge base is one of the best in this area. Establishment and set out of site survey control points. Sure, but wowee regarding that huge backwash and wave entering back into the surf zone. Whether the NSW state government / local council want to backflip with a pike on their current failing seawall master plan is another thing. This seawall will not only protect our homes but also Pittwater Rd, and the many communication and public services installed under it, from inevitable future storm events. Would be really good to see an article on the current state of affairs in the Coastal engineering world. Environmental vandalism or gross negligence? 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. Compare their prediction of how it would look with the reality shown above.. https://www.eventbrite.com.au/e/climate-change-and-coastal-erosion-the-g GOR coastal erosion webinar link for today at 3pm for those interested. They are the real villains, as regardless of what anyone says or does, these idiots can allow or disallow engineering developments so the buck stops there! Step 5: Construct the Seawall. Not off topic JS, wouldn't be surprised if there is a hyperlink to that video in the sea wall approval document!. The seven metres protruding above sea level is vertical, even going beyond vertical for the final metre to prevent wave overtopping. Big walls like this one are getting smashed and although for the most part they are still there, everything behind them is going. oh yeah and someone call security. These walls stick straight up into the air like a fence made of steel or concrete. It is worth remembering that this council, as Warringah, council, was twice dismissed for corruption and incompetence. Given that it seems to fly in the face of best practice, has anyone asked what the NSW Coastal Council has to say about it? It pisses me off that people wilfully or ignorantly choose to buy in areas that are not for purpose, enabled by the property industry and then scream out for taxpayer help when the inevitable disaster occurs. Will try and find out. State govt has been acquiring properties for more toll roads of late and they have been getting low-balled big time, totally screwed over. Sounds like the beach will be off limits/ too dangerous to walk on for weeks until the NSW Beaches Council recovers the rusting rebarb & concrete waste scattered along the beach then? Jeez. To add a bit of controversy, I've often wondered: Is Carties borderline just a novelty wave? The sea wall forms a permanent, stationary barrier between the sea and the land. Hourly Multiple Swells Wind Highlighting Model Units ft, mph. Photograph: Lewis Isaacs/The Guardian Beachfront residents back. Nobody there is in a position to offer 2-3 times market value. Some interesting papers about building seawalls and the effect it has on risk perception in the post Tsunami context in Japan: Littlejohn (2020) "Dividing worlds tsunamis, seawalls, and ontological politics in Northeast Japan" Yamashita (2020) "Living together with seawalls: Risks and reflexive modernization in Japan". All of which. My guess is that their engineers took a different view of how to best manage the situation. I have the mhl report but cannot find the link again. The lessons, it would seem, are still being learnt. Construction of a seawall is underway to protect homes at Collaroy Beach. Or as the comment above lists - quoted by Prof Short - not let the property developers and real estate industry interfere with good management strategy decades ago that would have avoided council being left with a steaming pile of shit. At this point, no-one can say if any consultation occurred, though the cynical view is council ticked the box by distributing flyers to the immediate neighbours, all of whom would want similar works built to protect their properties. EDIT: Just to be clear, the issue of erosion has nothing to do with sea level rise, climate change, or buying the latest board. These seawalls are easy to design, and easy to construct. It would be possible to introduce a major sand nourishment program to move the shoreline seaward, says Gordon. Vertical Seawalls Vertical seawalls are exactly what you think. Owners, Council and 'engineersshame shame shame. Ignorant clown. You got to have demand/competition in order for a buyback to increase value of supply. So whats your thoughts about using tax payers $'s to buy back endangered properties from natural erosion and as I asked Zen.are there any solutions other than just moving people property back from the Coast? Comparing the swell to those of last year it wasn't of any major significance but it shows the futile efforts trying to protect property with a hard structure. For those who object to it, there is something hostile about Collaroy's multi-million-dollar sea wall. They have destroyed every built form on the beaches. Step 3: Calculate the number of pilings that will be required. which is why the video is so interesting. Im presuming that sand delivery's from the lagoon will be an ongoing thing. Again this can only be taken as opinion without proper scientific references. We all have valuable opinions, but they need to be separated from facts at all times, especially when it comes to Journalism. Guess where that temporary rock wall has ended up! You shouldve known by 1990. Aside from high tides and Tsunamis, Im guessing most islands/atolls dont suffer much erosion when surrounded by reefs? It only does BOUSSINESQ wave interaction and NOT sediment transport but you can still get a lot of good design-feedback Beaches like Bondi still had sand dunes and likely better banks all around. They've had a very very blessed life compared to anyone else in this country and that in return they would do such harm to a public place to save their private property is a bit sad. Such a shame. A bit like asking journos writing about climate change to include references scientific papers talking about how CO2 is a greenhouse gas. It never went to a vote of councillors, where it would have been likely voted down . However, theres an irony that could've beenliftedstraight out of a script for Utopia. What insanity! It looks like Chernobyl. More often than not, the pollies retiire and are parachuted onto the boards of these companies and live out their lives having enriched themselves quite nicely. development, carparks & roads behind the hind dunes leading to biketracks, walkways, supporting the community including good pics there willi, hadn't realised this. Thanks Lilas, Thanks, Lilas, I agree with there being challenges inherent in generalising, but I'm going to resist the temptation to take our shared pedantry down the rabbit hole this time! Insurance companies know this. Would be interesting to see the state of that beach on the north side of breakwall now, This was the same dune system a few years before all these easterlies. However, the bean counters and quantity surveyors were extremely difficult for obvious reasons. This is an example of the walls theyve been placing. I've got a mate who works for MHL as a coastal engineer. Has been for a while. 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. Stop wasting money and do something that will achieve the intended goals. Hence, they are of no market value to me. We have over 40 years of combined experience installing, maintaining, and repairing seawalls on both residential and commercial properties. The co-founder of Ksubiis to launch a '70s surf-inspired hotel on New South Wales' Mid North Coast. https://www.dexpan.com/pages/how-to-use-dexpan-break-concrete-rocks-easily. (This statement also doesn't specify what type of HARD structure. Te Puna Aonui is the joint venture of government agencies that will deliver Te Aorerekura. The problem is one of vertical fiscal imbalance. processes currently-exported iron ore, bauxite, and alumina into green. Buy backs should only be an.option when they contribute to an environmentally sound solution. Perhaps the omission was because in 2002, protestors, led by Brendan Donohoe and Surfrider Foundation founder Tom Kirsop, formed a line in the sand stretching from Collaroy to Narrabeen opposing the construction of any seawalls. Cheers. This can easily be achieved by creating offshore reefs that reduce the energy to a level the beach can cope with. Though with 80 properties at risk, and coastal real estate prices at a premium, they gave up on that approach in 2007. A quick trip Todos Santos way during a belting nor'west swell. It's only a temporary feature. I no longer live in the area but just can't believe it has progressed so far without anyone noticing. The Collaroy wall is not subtle. " Cheers for the knowledge Craig. Your browser has JavaScript disabled. However, while they prevent further shoreline erosion, they do not deal with the causes of erosion (French, 2001). Should have taken the high road. brutus Collaroy was not a typical situation. I asked a mate who works at MHL this exact question. You'd think that would then open it up for more legal action (aka why did ABC get first dibs and XYZ missed out?). increases social amenity". How about dredging narrabeen lagoon?? There's been a lot written about the challenges of the various adaptation options, including the purchase of private lands. And without getting too political its a good chance that the persons who own these properties will be liberal voters so called free marketers who abhor the intervention of government in their day to day life.. except when it concerns their interests.. Nup it is anchored to the bedrock. The houses up the dune with no apparent erosion would be an apple compared to these lemons (for now). https://static01.nyt.com/images/2017/01/28/world/28israel6/28israel6-sup https://files.northernbeaches.nsw.gov.au/sites/default/files/documents/g Basque Wavegarden Project Has Far-Reaching Implications, Watch: Ryan Callinan // Beneath A Pear Tree, Kala Grace In Dramatic Rescue While Competing In Backdoor Shootout, 'Corners Of The Earth: Kamchatka' Tour Dates, Watch: Cronulla's Jarvis Earle Wins World Junior Title. Building a vertical [with over-top] wall is about as insane a design as you can get, as stated and proven by all the intelligent people on this forum. Well go for them, put in your FOI requests and prove what we all suspect; that the council turned a blind eye to save themselves some money and appease a noisy minority. 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. as my old mate hutch likes to say. How was Collaroy Beach made? A number of properties along the oceanfront from Narrabeen to Collaroy were seriously endangered by erosion during a large storm swell in 2016. Also, "some councils are genuinely desperate to embrace the most apocalyptic climate change forecasts" - in your view what are "apocalyptic forecasts" of climate change and which councils are you referring to? Pretty incredible and frightening stuff. Instead they provide a caveat for bulldozing sand from low on the beach to higher on the beach in times of heightened storm activity - which only lowers the beachs natural defence system. In this case there is evidence that the council and land owners subverted the approval process. Wonder if he has been down there in the last 2 days to check on status of wall? In a story on Northern Beaches Review, Bob Orth, who lives in one of the houses behind the seawall, said the seawall should inspire others to do likewise. If anyone was to slide down the edge during one of these high-tide swells there would be a high chance of being washed off their feet and dragged out to sea. @dawnperiscope. I cannot see how can this be a feasible long-term strategy from the cost perspective. Proven time and time and time again that sea walls do not work- period. This wicked problem is a result of intergenerational dumbness. I suspect the engineering report will say thatif we ever get to see it. I hope this Collaroy wall hasn't set a precedent. I'm a huge tree-hugger but they will not stop powerfull ocean waves. I would rather have seen the money go into a couple of California style piers. What an absolute joke of a mess this has turned into. 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. I am actually shocked the collaroy houses in particular have gone up in value - i wouldnt be able to sleep at night living there! Has any one ever suggested an off shore reef, seems like a win-win or is the sea floor unsuitable? https://static01.nyt.com/images/2017/01/28/world/28israel6/28israel6-sup Sea-change hostage negotiations at Hellhole of the Pacific Please enable it to continue. 1. https://www.sydneycoastalcouncils.com.au/sites/default/files/JRCorkill_A(2)_Prop_L_Rev_67-84.pdf, yes, Blindboy, I am guessing they had absolutely no input on the final [or initial] design what-so-ever as they were only used as a consulting service by the Coastal engineers. 42 online submissions ALL supporting the wall but many seem to think it would be a sloping rock construction. I assume this would all depend on the power of the state government/council etc to cap buyback prices, similar to land buybacks for roads, airports etc. The primary mechanism for coastal land acquisition in NSW has been the Coastal Lands Protection Scheme, but it wasn't designed for climate/erosion buy-backs. Just take the hit cost wise now and return the area to something close to its previous natural state. I have a blanket policy of not feeling sorry for people owning properties worth multiple millions of dollars, who have lived the better part of their lives walking from their beachfront home directly onto the sand. High rise apartment buildings demolished when they realised it was the most cost effective and environmentally sound long term solution. Also I'm suspecting at the lga level the up front investment to do this work can be a hard sell. From deep state secret spot to modern media darling, what lessons can we learn from Cape Solander's evolution? And there's no risk. A seven-metre high wall erected to protect beachside mansions from being washed away has sparked debate among locals in a wealthy Sydney suburb. Craig Brokensha on the Sunshine Coast there is a similar 'future' proposal for a rock wall between Alexandra Headlands and Maroochydore beaches. The rich get richer, the poor get the picture, no bombs never hit cha when your down so low". and I live 8 hours away. The first application for a sloping structure was widely publicised and accepted by most who saw it. 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). Market value is driven by what people are willing to pay for it. Will be ironic if they have to pull it down for not meeting code on the steps. https://www.odt.co.nz/news/dunedin/tarzans-stormy-st-clair-skinny-dip. It's an interesting point whether you just blame the owners for buying a house in such a risky area and hoping taxpayers will bail them out, versus the fact that the council must have approved people building houses there in the first place (although possibly a very long time ago), "Professor Short said the council bought properties along the beachfront and turned them into parklands in the 1970s and attempted to put a moratorium on redevelopment in the 1980s, but lost its case in court.". They realised it was the most cost effective and environmentally sound solution Collaroy & # x27 s. 'Ve written about it before but the real reason here is money- it is worth remembering this! Roads and buildings are about to fall into the air like a or! Better qualified out there everything behind them is going to fall into the air like a fence made of or... Done some research but the swellnet knowledge base is one of the best this. 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It never went to a level the beach can cope with when large swells and high tides Tsunamis! Am looking at it but there is a hyperlink to that video in the coastal engineering.. Permanent, stationary barrier between the sea wall to include references scientific papers talking about their! At Collaroy beach lot written about the challenges of the best in this case there is a result of dumbness.: Calculate the number of properties along the beachfront theres an irony that could 've beenliftedstraight out of survey!
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