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From the radio programme, it sounds like we do need something as big as this and it is suggesting minimum disruption, with the Tideway Tunnel being dug underneath the river. But on the ChiswickW4 site they mention disruption for Chiswick:http://www.chiswickw4.com/default.asp?section=info&page=ewater06.htm"The massive tunnel, designed to stop sewage overflowing into the Thames, will run under the river from Hammersmith to Abbey Mills in East London. However, it will be Chiswick that will bear the brunt of the disruption during its construction after Homefield Recreation Ground was identified as the only piece of open ground suitable to site an entry shaft for the tunnel. The true impact of this substantial engineering project was first realised back in November 2004 when representatives of the Thames Tideway Strategy Group made a presentation to the Chiswick Area Committee. Their presentation outlined the formation of a 35km tunnel, 80 metres below ground level which would end the necessity to pump sewage into the Thames at times of heavy rainfall but would need an access shaft to gain entry to the tunnel during its construction. It would appear from diagrams published this week that the shaft will be sited in the recreation ground signalling several years of major disruption, loss of open space and possibly a permanent scar on the park. It is understood that Homefield Ward Councillors are presently being briefed and will respond appropriately in due course."But it will cost us, the Thames Water customers. The estimates have already risen in the past few months to £2.5bn. Here on the Thames Water website they estimate what we will be paying:http://www.thameswater.co.uk/UK/region/en_gb/content/FAQ/FAQ_000054.jsp?SECT=FAQ_000054"At this stage, before detailed plans have been put together, we estimate that it will cost between £2 billion and £2.5 billion. We are in discussions with Ofwat on how best to finance the project. Ultimately Thames Water customers will pay through increased charges. Ofwat estimates that this could add approximately 13% to the cost of a typical bill peaking in 2017/18, at around £37. The earliest customers could expect to start seeing bills rising as a consequence of the new work would be 2009/10. Increases would be spread across the years as the tunnel is built." 

Duncan Walker ● 6478d

I wouldn't swim in the Thames. Thames Water regularly discharges raw sewage into the river. Here's some facts and figures previously posted relating to a previous massive fish-kill in the Thames two summers ago. Nothing has changed! "MRAG is getting an increasing number of calls from journalists about the role played by Mogden in the 3 August fish-kill incident in the Thames. We thus think it would help to avoid speculation or inaccurate reporting if we could know the answers to the following questions: 1. How many million litres of sewage was released directly from Mogden into the Thames and how much was released from sewer overflows in the catchment as a result of the storm on 3 August? 2. What was the maximum flow received by Mogden during and after the storm and for how long was this in excess of the design capacity of 810 Ml/day? 3. Which of the four west-side primary tanks was out of commission for modifications at the time of the storm and what is its volume? 4. Given the above and the fact that the east side was struggling with excessive sludge flows from an unknown source, how much did this reduce the treatment capacity of the plant at the time of the storm? 5. Also in view of the above, were any storm tanks in use prior to the storm and did any fail to fill during and after the storm?" In the absence of a response from Thames Water, this is what we believed happened on 3 August. 1. Total sewage overflow from Mogden on 3 August was 200,000 million litres - a third of the sewage released into the Thames that day but by far the most toxic compared to that from combined sewer overflows. 2. The maximum flow into the works was probably not much above it's theoretical capacity of 810 Ml/day. However, in an attempt by Thames Water to save costs during the 1998/99 extension, the plant's actual maximum flow capacity only ended up around 690 Ml/day. Storm flows typically last up to a day due to the size of the catchment. 3. We know at least one of the four large west side primary tanks was out of commission for repairs due the continuing breakdown of their antiquated scraper bridges. The effect on flow reduction would be around 50 Ml/day. 4. The flow through the larger east side could have been impeded by as much as a third due to a 'mystery' sludge - possibly even from Thames Water itself, further reducing the treatment capacity by around 150 Ml/day. 5. The Mogden storm tanks are in nearly daily use due to inadequate capacity at the plant. Why else would Thames be applying to spend £50 million to cover them if they were only used for a few hours on a few days a year? You only have to look at any aerial photograph of the plant, all of which are taken on dry clear days, to see several storm tanks in use. Even the photograph on Thames Water's Mogden website shows all the tanks in use! It would be safe to say that at least two thirds the 91 Ml the tanks were in use prior to the storm of 3 August. So, assuming a storm equal to the theoretical design treatment capacity of the plant of 810 Ml/day, the capacity and performance shortcomings would have reduced this by 320 Ml/day. The remaining storm tank capacity would have filled in just over 2 hours and 15 hours later you would have 200,000 Ml of raw sewage killing fish in the Thames. All those fish need not have died if the plant was professionally managed by an organisation that put engineering and the environment first and profit second. It is time the regulators woke up to this fact and took some real action. Steve Taylor

Steve Taylor ● 6535d

This looks interesting, a new book about the Thames, by Peter Ackroyd – ‘Thames: Sacred River’, out on September 6th. Apparently, Ackroyd walked the length of the river to research the book. I wonder what he has to say about the Brentford stretch?A synopsis from Amazon.co.uk:"The book, ‘Thames’ is about the river from source to sea. It covers history from prehistoric times to the present, the flora and fauna of the river, paintings and photographs inspired by the Thames, its geology, smells and colours, its literature, laws and landscape, its magic and myths, its architecture, trade and weather. The reader learns about the fishes that swim in the river and the boats that ply on its surface; about floods and tides; hauntings and suicides; miasmas and sewers; locks, weirs and embankments. The most recent bridge opened in 2002 (the Millennium walking bridge); the oldest in 1250 (appropriately called New Bridge, it is in Oxfordshire). 'My fair lady' of London bridge is falling down is identified as Eleanor, Queen of Henry lll; Mapledurham House near Henley as Toad Hall of Wind in the Willows. In AD 54, the river was 14 feet shallower than it is now, flowing sluggishly at low tide through sandbanks and swamps: thus Caesar and his legions could cross the Thames and defeat the British tribes. 1700 years later, malaria in the marshes of the estuary was so terrible that some men had 'from 5 to 6, to 14 or 15 wives' consequence, as Ackroyd writes drily, of mortality not profligacy. Here is Shelley floating on the river under poetical beech trees, Hogarth getting roaring drunk on a boatrip to Gravesend, William Morris wondering whether the same Thames water flowed past his windows in Hammersmith as flowed past his house at Kelmscott 100 miles upriver. Did you know that Pepys (in 1661) was the first to mention a dock on the Thames? That one vat in the Rum Quay at West India Dock held 7,800 gallons of rum? That 'toe-rag' (meaning despised individual) derives from sacking worn over the boots of workers in the grain and corn warehouses of Milwall Docks? That hangings continued at Execution Dock until 1834? Peter Ackroyd has a genius for digging out the most surprising and entertaining details, and for writing about them in the most magisterial prose.”The author, Peter Ackroyd, will be discussing his work and taking questions from the audience at the Queen Elizabeth Hall, Wednesday, September 19, 2007,  http://www.southbankcentre.co.uk/literature-spoken-word/productions/peter-ackroyd-17426

Duncan Walker ● 6544d