A seven-metre high wall erected to protect beachside mansions from being washed away has sparked debate among locals in a wealthy Sydney suburb. For Sydney its not just beach suburbs. we all end up paying for it directly if we haven't already e.g. 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! The fucking vandals bulldozed down one of the last remnants of coastal heath to get their heavy equipment in. Establishment and set out of site survey control points. heres a rad idea for you,dig canal from coast to central Australia which is considerably below sea level and flood the interior.could also be done in death valley USA.now that could be a wave pool!! First completed by the French in 1735, the Pondicherry seawall reaches a height of 27 feet above sea level. Most of these dunes have been heavily impacted by the La Nia easterlies over the last 2 years causing several car parks next to the beaches to be roped off. It is worth remembering that this council, as Warringah, council, was twice dismissed for corruption and incompetence. A barrier reef in place would no doubt have knock-on effects. Five years ago, residents along Collaroy Beach watched helplessly as enormous waves smashed into their backyards, collapsing pools and patios of their multimillion-dollar waterfront properties. I guess that the levees will give me a 100% guarantee that it'll never happen in my lifetime". Buy backs should only be an.option when they contribute to an environmentally sound solution. 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. Any system that affects the coast from a different angle upsets the balance of that orientation and the system then takes considerably more time to re-adjust. All the sand has moved south east where previously there were great rock lagoons there is now 100 metres of sand dunes. There are many software suits now that can handle very complex near-shore modeling, including sediment transport from wave and current action. However, the bean counters and quantity surveyors were extremely difficult for obvious reasons. bit of a worry but, when you buy a nice piece of land by the ocean in high risk erosion zone..why do tax payers have to buy the property back,,,surely the owner knew the risks ? Tonights high tide is 1.34m, tomorrow morning is 1.96m. At what point do we put an end to this insanity. How about dredging narrabeen lagoon?? The protest was backed by the growing greens movement at the time and successfully pressured the then Warringah Council to knock back the protective walls. "When a hard structure is introduced to the equation we see an increase in reflective energy and turbulence, slowing the accretion of sand while also accelerating erosion in storm conditions." The thing is- in those pics, behind the walls, there's really not much to protect. Ratepayer/taxpayer bailout, so business as usual whatever happened to caveat emptor? All of Ramsgate, Brighton, Kyeemagh, Dolls Point, Scarborough Park and lots more will be underwater in 50 or 100 years time. "Sea walls do nothing to ensure the ongoing conservation of the beach in front of them," Mr Donohoe told crowds. In a 2007 story for the Sydney Morning Herald, both Rob Stokes and a spokesperson for Warringah Council admit buyback isnt feasible and that other means of defence would be necessary, such as dune reconstruction, revegetation, and sand nourishment. Collaroy seawall project | Protection from coastal erosion Watch on Location: Collaroy NSW Our specialist staff were engaged by the Northern Beaches Council to construct the 250m rock revetment seawall in front of the Collaroy Beach carpark. But, they just persist time and time again. For some it. Should this critical lens be applied to other topics such as the Coolum wavepool? Please enable it to continue. Should have taken the high road. And find outwhy you'll soon hear a hell of a lot more about them. The Northern Beaches took a massive hit by big surf and a king tide . This would be a better solution, I think. Jeez. I'm invested now, and want to know the latest. Pre-existing or failing seawalls (if any) should be removed as part of Step 2. The Collaroy seawall was in part constructed after a significant storm event in 2016 eroded 50 metres along the Narrabeen and Collaroy shoreline, causing damage to waterside properties. https://www.9news.com.au/national/weather-nsw-sydney-collaroy-surfer-pul Sydney 'Living' Seawalls Perfect future film location for backwash kook of the day. The seawall is probably built over them. It would be possible to introduce a major sand nourishment program to move the shoreline seaward, says Gordon. Kook survives a brutal seawall bashin' well almost! Both!! A quick trip Todos Santos way during a belting nor'west swell. If that is to be avoided there needs to be a concerted effort to gain the support of the wider NB community to create pressure on the council to develop a more acceptable plan. That is why this option was selected for Palm Beach Qld, and I think should be considered for all the other coastal erosion hotspots along the NSW coast as well. An increase in storm activity - particularly from the east and north-east, as has been proposed by Associate Professor Ian Goodwin - and the looming threat of sea level rise are X-factors for East Coast beachfront development. So would you like to inform me as to WHO designed this monstrosity if it wasn't an Engineer? The most notable benefit of sea walls is that they provide excellent protection against coastal erosion and flooding. Yep. If you don't know know shit about the processes of the ocean and coastal erosion then please put your hand up and say so. It's actually quite simple to install and get going unlike a lot of open-source software. 100% agree Craig, the only option is to buy back the properties and be done with it like they should have done years ago. The market knows this. Big walls like this one are getting smashed and although for the most part they are still there, everything behind them is going. In the end it's all pretty simple though, as most beach erosion of consequence is caused by large/powerful waves. They have access to and use a large suit of software modeling tools, but unfortinately a lot of them don't have outputs that non-scientists can get their head around [just numbers which are meaningless on the surface unless you understand what they represent.] 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. The politicians and land owners actions are an entirely separate discussion and I'm not entering into that minefield! I posted links to the relevant council pages in the previous story. 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. Fvck the coastline. However, NSW has an intricate coastal management and development approval system and surely there's a paper trail for the various consents and approvals for this abomination which would be subject to FOI? Sounds like you are pretty deep in that world! (AO) Climate projections will have some Australian surfers rejoicing, and others not so. Great article highlighting the competing interests of the natural environment and local councils (which are too easily manipulated by wealthy stakeholders). Links relating to the City of Sydney, and NSW in general - please read our rules before Engineered to Australian Standards. Has been for a while. And thats being generous. Any chance of a dedicated ErosionCam, Swellnet? The NB has always excelled at extreme ugliness. Link any useful papers youve found. I liken it to a form of gambling. Looks perfect for high tide backwash to spread up and down the beach. I no longer live in the area but just can't believe it has progressed so far without anyone noticing. Absolutely spot on, Craig. Yes and do they have tactile indicators in the correct place? Guess where that temporary rock wall has ended up! A weather-beaten cement plaque with the year 1952 is still visible along a section of the seawall. There is a common denominator here, "Coastal" engineers with a lack of knowledge and understanding of coastal processes. Whether the NSW state government / local council want to backflip with a pike on their current failing seawall master plan is another thing. Councils of times gone by should never have approved houses to be built on the beach in known spots of erosion aswell as houses on the beach full stop as sand dunes have there purpose . Stupid dumbfucks. Large waves have a lot of energy and must be forced to break further out to sea to dissipate the energy before reaching the sand shoreline. It appears that because of the relative lack of access to PC, the equation would be out of kilter to begin with. Ben, yes there are submarine cables and the protection zone is there to prevent damage to the cables, but I don't think that would preclude construction of reefs, it just means that any proposed reef design/construction would have to be in consultation with the cable authorities. https://www.celeria.org/ Lance any surf info about Middleton Reef ? It never went to a vote of councillors, where it would have been likely voted down . they will use loop holes to ensure eligibility. I looked into this again yesterday. With the benefit of ignorance, having not seen the actual plans, I'd be surprised if the foundations were able to fail easily as I'd expect they'd have been designed explicitly to avoid it. Protesters linking arms on the beach in 2002. They are frequently used in locations where further shore erosion will result in excessive damage, e.g. And there's no risk. I think we have already seen 19 cm of sea level rise on the east coast - and at least up here it hasnt translated to any significant/extended erosion issues. You don't have to look around the world because the Gold Coast has implemented the only effective "non- ugly as fuck" option at Palm Beach Qld. But it wasn't about the road - it was about appeasing multimillionaires who would have or should have known better. This just a year ago was a nice Sandune. It shows how different combinations of coastal defences and wave and tide conditions affect overtopping and flood risk. Hi Craig, the short answer is I'm not sure as I have been out of NSW too long. Probably not council's fault then, happy to blame the owners! The recently constructed Collaroy seawall yesterday failed - or passed - its first real test, depending on which side of it you stand. Preparation of sea wall GPS file suitable for upload to GPS rover or machine guidance equipment. Would be very interested in knowing what other options were considered and why they were discarded Yeah it's easy to get caught up in the house situation, but the road is at exactly the same height and built on sand too. This was done to ensure the wall would be up before people realised what it was. Edit: The estuary was in an area protected from the ocean and the cliffs only faced small wind chop and the tides. In the early 2000s, Warringah Council (as it was then known, its since been amalgamated with Manly and Pittwater) spent $6 million dollars buying three properties. Amongst other things, it is illegal to "establish, maintain or use a spoil ground or other ocean disposal point (including dumping materials at sea)". There are some fed govt areas that listen to this thinking. Surfers, sun bathers and swimmers. In Japan, their solution is to just go bigger and higher . Ignorant clown. More than double in wealth the last 7 years. as my old mate hutch likes to say. It has to be worth a look. Old bathing boxes which were on long piers sitting out in the bay are now sitting in the middle of sand dunes. Therefore, the group of Narrabeen and Collaroy residents are not successful in addressing the issue of coastal erosion. good pics there willi, hadn't realised this. Yep. Its a wicked problem theyve got, in the true sense of the word.. "Have you ever seen such a magnificent view as the one from our balcony overlooking this active volcano? Imagine the carnage during the next ECL. Ha! I mean, did someone forget about the old idiom about 'shifting sands' or what? These impacts would have been explicitly tied to that particular design option by the engineers and other specialists involved. If no acquisition or buyback is made, then good luck to the owners trying to sell these properties. As a result, dried out sediments are carried by the wind towards the land. I am safely 140m above sea-level now so that should be safefor a while hahaha. This clearly did not happen at Collaroy. I watched a 4 corners or foreign correspondent thing last year on the Japan sea walls. I saw the construction going in, says Donohoe of seeing the area cordoned off earlier this year, and thought they were building rock revetments. 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. There's no sense at all in building something like this from an engineering perspective. Just wondering if the stairs built into the wall are private property? (Those suburbs are just local ones I know a bit about.

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