London Tideway Tunnels

We are proposing to build two separate tunnels - the Lee Tunnel and the Thames Tunnel - to substantially reduce the level of untreated sewage overflowing from London's Victorian sewers into the River Thames and its tributary the River Lee.

The tunnels will capture the most polluting sewer overflows then transfer them to Beckton Sewage Treatment Works in east London for treatment.

The tunnels are required to ensure the UK complies with the European Urban Waste Water Treatment Directive.