London’s antiquated sewer system overflows into the river Thames around 60 times a year. The solution is a colossal new pipe, currently under construction, with a capacity of 1.6 million cubic metres.
, CEO of Tideway, the company behind the project. The answer they came up with was to build a gigantic overflow pipe deep underground, beneath the Victorian sewer, to intercept its overflows. The Tideway Tunnel isIt won’t solve the problem completely: when the rain is really heavy there will still be discharges. But it will reduce their frequency to around three of four times a year, and the overflow will be predominantly rainwater.
There is no sewage in there now – the dirty work starts next year – and the tunnel is eerily beautiful, like smooth alabaster in the cold glow of the strip lights. “This is one of the most photogenic pieces of tunnel I’ve ever built,” says Mitchell. That is because there is a sinuous kink that is oddly pleasing to the eye. It wasn’t planned but they had to skirt around a boring machine that became stuck, doing a “turn and bury” manoeuvre to get it out of the way.
The tunnel slopes gently down from west to east, a few millimetres every metre. That enables the sewage to flow by gravity, no pumping required. “It doesn’t sound much but it’s enough to keep it moving,” says Mitchell.
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