|The tunnel boring machines are grinding their way beneath the streets of London this very minute. The goal: to complete construction of the Thames Tideway Scheme by 2023, a 25-kilometer-long tunnel needed to transport London’s sewage and rain run-off to faraway water treatment plants, preventing it from being dumped into the Thames.
The work, which will cost £4.2 billion (€4.7 billion), has been called London’s largest water infrastructure project in 150 years. In fact, its construction will make it possible to completely renew the city sewer system, reducing the volume of wastewater poured into the Thames by 95%. According to the calculations of the British Ministry of Economic Development, once the work is finished it will create a benefit to the British economy of £13 billion pounds (€14.5 billion).|