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The Thames Barrier spans 520 metres across the River Thames near Woolwich, and it protects 125 square kilometres of central London from flooding caused by tidal surges. It has 10 steel gates that can be raised into position across the River Thames. When raised, the main gates stand as high as a 5-storey building and as wide as the opening of Tower Bridge. Each main gate weighs 3,300 tonnes.
The barrier is closed under storm surge conditions to protect London from flooding from the sea. It may also be closed during periods of high flow over Teddington Weir to reduce the risk of river flooding in some areas of west London including Richmond and Twickenham.
The Thames Barrier will then remain closed over high water until the water level downstream of the Thames Barrier has reduced to the same level as upstream. This is a managed process to provide for different circumstances, and takes about 5 hours. The Thames Barrier is then opened, allowing the water upstream to flow out to sea with the outward-bound tide.
The Environment Agency has closed the Thames Barrier 174 times since it became operational in 1982 (correct as of March 2014). Of these closures, 87 were to protect against tidal flooding and 87 were to alleviate river flooding. The frequency of closures has increased over recent decades.
We continued along the final stretch of the Barrier Hwy from Cober to Nyngan where we turned onto the Mitchell Highway towards Parkes.
The sun started to set. When you looked up the hill, this is what you saw.
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Montrose Harbour Cyclocross Race.
12/03/2006
Illinois State Championships
©2006 Naz Hamid. All rights reserved.
I've been building up a collection of animal barriers which I'm now ready to show. See them all here.
idleidol.net/construction-barrier-animals/
I've seen lots of these frog barriers. Great design though.
I have a possible three 'fun' dives left on my last day but I literally cannot get out of bed this morning.The dive instructor knocks on my door at 6am. 'Are you diving this morning?' I stand there bleary eyed in my pyjamas wanting to say something sarcastic but before I can speak he apologises for waking me up and leaves.
My first dive today is at 11am and as there are only seven of us on the boat and only two of us are certified, I have no choice as to who'll be my buddy. Bizarrely enough I met Chris on my travels up to Alice Springs. He's an Advanced Diver too so I have no qualms about diving with him although he's very nonchalant about everything.'Yeah yeah don't worry' he says to everything. Little did I realise he'd be as bad at navigation as me. After exploring the reef canyons and figuring it's time to go back, neither of us has any idea where the boat is. Chris signals for us to surface. To my horror we're about half a kilometre from the boat and nearly out of air. We're forced to swim through choppy waves back to the boat.
After this experience I'm reluctant to go on a night dive with him. Who knows where we'll end up, and in the dark. The instructor tells me I'll be able to see the lights from underneath the boat for miles around. He's right.
(Photo- Parrotfish)
I decided to go on an urban walk today, along the side of the Thames in East London, ending up at the Thames Flood Barrier. I used a 'Big Stopper' filter for the first time, thinking that it would soften the water's appearance. I can't decide if I like it or not - I took some photos of the barrier on mono film back in the eighties and nineties, and I may actually prefer them... D800_20670.NEF. Many thanks for views, comments and favourites.
Every year the barriers seat on the sideways, but this year the city used them a lot
IMG_20161231_212020
Enabling access, MAF facilitates help, reaching people otherwise cut off by formidable barriers or dangerous circumstances.
La nouvelle calédonie possède le plus grand lagon au monde 24000km² protégé par une barrière de corail immense et magnifique :-)
Pris de l'avion en allant à Ouvéa
The Thames Barrier viewed from Silvertown across the Thames to Charlton
SH103171a
All Rights Reserved © 2008 Frederick Roll ~ fjroll.com
Please do not use this image without prior permission
This is the first motorcycle friendly crash barrier in Iceland.
It was installed as a test project by BLS, Iceland (MAG Iceland) and The Icelandic Road Administration.