The London sewage system designed by Bazalgette has served the capital for over 150 years. The system was designed to server four million people, but today the population is nearer nine million. The combined system funnels sewage and rainwater to the treatment works at Beckton, but when it rains heavily the untreated (albeit diluted) sewage spills into the river Thames. A new sewer system is needed that serves modern London and that can cope with further increases in population.
At a Glance
- A new super sewer system to ensure the River Thames remains clean for use for another 100 years
- The project aims to reduce the amount of overflows to four per year, down from 50
- Amey is responsible for the design, construction, installation and test of the system which controls the operation of the Tideway Tunnel
- Amey is implementing cyber security policies to ensure that the asset is as secure as possible
- Handover of the completed system is expected to be in 2025
A new “super sewer” that is 7.2m in diameter is being built along a 25km length of the river Thames at an estimated cost of £4.3 billion. The sewer runs from Acton in the West connecting to Beckton Sewage Works in the East via the existing Lee Tunnel. Excess surface water run-off during periods of heavy rainfall will no longer result in raw sewage flowing into river, instead the Victorian sewers will over-flow into the Tideway Tunnel and channelled to the Beckton Sewage Treatment Works at a rate that can be processed.
Currently there is an overflow of sewage into the river roughly fifty times each year. The Tideway project aims is to reduce this to a maximum of four times per year. The additional capacity provided by this super-sewer should ensure that London, and the River Thames, remain clean for use for another 100 years.
Amey has been the Systems Integration Contractor on the Thames Tideway Tunnel Project since 2015, working alongside of some of Europe's biggest contractors including Balfour Beatty, BAM, Costain and Ferrovial. Handover of the completed system is expected to be in 2025.