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The ‘lost rivers’ of London

Why London needs the Thames Tunnel IEMA Conference 2011 Optimising Infrastructure within environmental limits Tuesday 15 November 2011. The ‘lost rivers’ of London. Bazalgette’s interceptor sewers. London Tideway Improvements. Sir Joseph Bazalgette. London Tideway Improvements.

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The ‘lost rivers’ of London

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  1. Why London needs the Thames TunnelIEMA Conference 2011Optimising Infrastructure within environmental limitsTuesday 15 November 2011

  2. The ‘lost rivers’ of London

  3. Bazalgette’s interceptor sewers

  4. London Tideway Improvements Sir Joseph Bazalgette

  5. London Tideway Improvements Sir Joseph Bazalgette Sewer overflow point

  6. London Tideway Improvements • Sewage Works Upgrades Sir Joseph Bazalgette Sewage Works Upgrades - Mogden

  7. London Tideway Improvements • Sewage Works Upgrades • Lee Tunnel Sir Joseph Bazalgette Lee tunnel construction - Beckton

  8. London Tideway Improvements • Sewage Works Upgrades • Lee Tunnel • Proposed Thames Tunnel Sir Joseph Bazalgette Sewer overflow point

  9. Putney Bridge CSO

  10. A CSO in action

  11. 27 May 2011, Hammersmith Bridge

  12. 5 June 2011, Barnes

  13. Why tidal flows are important

  14. Approach to EIA • Integration – EIA / Planning / Design teams co-located by geographic area (West/Central/East) • Mitigation by design, facilitated by co-location and specific EIA and Design team workshops • Consultation – Planning Act requirement to front load consultation

  15. Stakeholder Consultation EIA and Reporting Stages

  16. Environmental challenges • London • Scale of project (22 sites in 14 Local Authorities) • Location of CSOs • Working in the foreshore • Key environmental challenges: • Traffic and transport • Noise and vibration • Air quality • Townscape and heritage

  17. Transport • We propose to: • use the river to transport 90% of excavated material from the tunnel at the main tunnel drive sites • use the river to bring in and take away the majority of bulk material used to fill the cofferdam at the foreshore sites in the River Thames • explore opportunities to use rail freight to move material to or from our sites • take into account the potential impact on the local road network.

  18. Approach to EIA - reporting • Preliminary Environmental Information report (PEIR) comprises 28 volumes: • Vol 1: Introduction • Vol 2: Proposed Development • Vol 3: Alternatives • Vol 4: Scoping opinions and technical engagement • Vol 5: Assessment Methodology • Vol 6: Project wide assessment • Vols 7 – 28: Site Assessment Volumes • PEIR available on website as part of Phase 2 consultation

  19. Sustainable development • Challenge of balancing the long term benefits with the short term construction effects • Reuse of excavated material – options appraisal developed in discussion with Environment Agency • Commitment to use of river for transportation of excavated material • Early development of Code of Construction practice in consultation with EHOs • Sustainability Strategy being promoted and developed by team embedded in project office, looking at whole life cycle of the project

  20. Reasons to act now Doing nothing will mean: • Continued overflows, causing environmental damage • Continued health risk to river users • Continued adverse impact on attractiveness of river frontage • Risk of heavy fines being imposed on the UK If the Thames Tunnel is built it will still be functioning in the 22nd century

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