Shifting Sewage

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This film, from the Institute of Engineering and Technology (IET), looks at the London sewerage system. This is a combined system in which dirty water from households and excess rainwater all ends up in the same place. When heavy rainfall fills the system it needs to be able to overflow into the river rather than the roads. Expelling sewerage into the River Thames is also a problem. Every year, 32 million cubic meters of untreated sewerage overflows into the Thames. The solution to this problem is the London Tideway Tunnels, which will connect 35 of the most polluting overflows, collect the discharge and transfer it to a treatment plant. This engineering project will be one of the largest ever carried out in London and will take eight years. This film explores the challenges involved.

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