Once upon a time, the River Thames flowed gently through the city, slow and wide, or wider, according to the weather. At various points in the 19th century and particularly when Joseph Bazalgette was master-minding the critical job of master-minding a sewer network , the Thames was edged with a series of embankments. This had the effect of making the river narrower, deeper, and therefore faster flowing.
By the middle of the twentieth century, this was becoming a problem. A few times a year, high tides were presenting a danger of flooding to London. Something had to be done. That ‘something’ turned into the Thames Barrier at Woolwich.
In 1972, the Thames Barrier Act and Flood Protection Act was passed by The Greater London Council, and in 1972, work commenced.
'The gates, each of which are 19 metres high and weigh 3300 tonnes, divide the river into six navigable spans, four of 61metres (200 feet), and two of approximately 30 metres (100 feet). The barrier was designed to be solid, durable (serving London until at least 2030), failure proof and bomb proof. It has so far survived 12 collisions with ships without sustaining any serious damage.' www.cityoflondon.gov.uk
The barrier was originally designed to protect London from a very large flood (1 in 100 years) up to 2030. By October 2021, it had been closed 200 times – it’s 208 times now. And the barrier has been modernised and improved to take it beyond its original shelf-life.



Much of the science behind it is beyond me. But it’s a beautiful thing in its own right, and I can appreciate that: even if I don’t understand the engineering. This short video may help.

For Debbie’s Six Word Saturday. And if you haven’t visited this post and voted … please do.




















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