The Thames Tideway Tunnel is an under-construction 25 km (16 mi) tunnel running mostly under the tidal section of the River Thames through central London, which will provide capture, storage and conveyance of almost all the combined raw sewage and rainwater discharges that currently overflow into London's river Thames.

Construction started in 2016 and is projected to take seven to eight years, with a target completion date of sometime 2023. Once constructed, the main tunnel will have an internal diameter of 7.2 m (24 ft).

It will connect 34 of the cities most polluting combined sewer overflows, via transfer tunnels, and is expected to reduce the number of overflow events to a maximum of four per year. The tunnel will transfer the captured sewage to the Stratford to East Ham part for onward delivery to Beckton Sewage Treatment Works for treatment. The recycled clean water is then released into the River Thames.

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