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SUMMARY:The Lee Tunnel – progress on the largest and deepest tunnel in L
 ondon - Roger Mitchell -  Lee Tunnel Project
DTSTART:20140424T173000Z
DTEND:20140424T190000Z
UID:TALK51676@talks.cam.ac.uk
CONTACT:Tim Wilkinson
DESCRIPTION:The Lee Tunnel in London is the first of two tunnels\, which w
 ill collectively capture an average of 39 million tonnes of sewage a year 
 from the 35 most polluting combined sewer overflows (CSOs)\, built by the 
 Victorians as part of a sewerage network that still serves London 150 year
 s on.  The project required boring London’s deepest-ever tunnel through 
 high groundwater pressures and passing through four miles of the most abra
 sive ground\, without any other shafts along the way.  The tunnel will hel
 p prevent more than 16 million tonnes of sewage mixed with rainwater overf
 lowing into the River Lee each year\, by capturing it and transferring it 
 to Beckton Sewage Treatment Works\, which is being expanded by 60 per cent
  to enable it to deal with the increased volumes.\n\n\nThis very large pro
 ject required the building of a drilling machine specifically designed for
  the Lee Tunnel.   In 2012\, the drilling machine Busy Lizzie began boring
  the seven-metre diameter tunnel\, which is the width of three London buse
 s.   Tunnelling was finished in January 2014.  The talk will focus on the 
 engineering activities and the progress made to deliver a sewage system to
  rival and excel  those built by our Victorian predecessors. 
LOCATION:Lecture Theatre 0\, University of Cambridge Engineering Departmen
 t\, Trumpington Street\, Cambridge
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