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Thames Tideway Tunnel: Background to the project

Thames Tideway Tunnel: Background to the project. Thames Tunnel Commission 29 July 2011. TTSG reports 2005. Thames Tideway Strategic Study started 2001 to “protect the Thames Tideway from adverse effects of wastewater discharges” Four possible strategies considered

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Thames Tideway Tunnel: Background to the project

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  1. Thames Tideway Tunnel: Background to the project Thames Tunnel Commission 29 July 2011

  2. TTSG reports 2005 • Thames Tideway Strategic Study started 2001 to “protect the Thames Tideway from adverse effects of wastewater discharges” • Four possible strategies considered • Eight options worked up based on strategy 3 • Preferred solution: large diameter storage and transfer tunnel, delivered within 15 years • Smaller-scale measures with earlier implementation considered in supplementary report

  3. Ofwat/JB review 2006 • Commissioned to • identify assumptions and gaps in TTSG report • consider partial solutions • Potential solutions grouped under “Strategy 5”: integrated stormwater management • Proposed Option X: • 9km tunnel from Hammersmith to Heathwall PS • Screening plants at Heathwall PS and Earl PS • Primary treatment facilities at Abbey Mills PS • In-river skimmers

  4. TTAG/TW: Options development 2006 • July 2006: Defra asked TW to develop and assess two options by year-end • Option 1: one 30km+ tunnel under Thames and treatment in E London • Option 2: two shorter tunnels in W and E London • Three iterations of each option tested • Option 1c selected as preferred option • One tunnel from Hammersmith to Beckton and one from Abbey Mills to Beckton

  5. RIA 2007 to pre-consultation 2010 • Defra RIA (March 2007) – IPR of development of phased single tunnel approach • TW pursued development of this option • Cut in CSOs served – 34 to 21 • local solutions for other 13 CSOs • Three route variants considered • River Thames route • Rotherhithe route • Abbey Mills route (preferred)

  6. TW: Consultations 2009-11 • Site selection consultation 2009 • local authorities and other stakeholders • Phase one consultation Sep 10 – Jan 11 • scheme approval and planning context • TW compliance with legislation and guidance • publication range and suitability • Phase two consultation to begin Sep 11 • TW aim to submit planning app summer 12

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