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You hear the complaints from the joggers and the rowers when they have been out on the river after a burst of heavy rain. It's not so much the smell as the thought of it � that human waste bobbing menacingly under the oars, those unfurled condoms sweeping along just below the surface in the tidal eddies, like a rare species of venomous jellyfish.
London's subterranean sewage system generally works very well, but on average and about once a week, the giant pipes cleanse themselves, of necessity, by automatically dumping overflow sewage and rainwater, on average 32 million cubic metres of sewage year. Over the next 12 months you could fill the entire O2 Arena to the roof, 15 times over, with the untreated effluent dumped into the river.
This occurs at more than 30 points along the river, often at its more picturesque stretches such as Chiswick and Hammersmith. The tidal nature of the Thames ensures that sewage is sucked up river, past the joggers, rowers, and occasional hardy swimmers, before it is finally pushed back and decanted into the sea.
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