I don’t know how many of you have been to the West Reservoir Centre in Green Lanes recently, but they are currently working on a Thames Water Main Extension.
Curious to understand what’s the project about I found the explanation in this Thames water web page:
The extension will be built using underground Tunnel Boring Machine (TBM). It will be lowered into the shaft at Stoke Newington (the site of the West Reservoir, off Green Lanes) and will be driven to our existing site at New River Head (Amwell Street) in Islington.
There will be two extensions – one north and one south of the River Thames. The routes have been chosen following analysis of the results of surveying and investigations along the proposed routes. Due to relatively high housing development density, the tunnel will pass below a number of residential/commercial properties. Wherever possible, we will drive the tunnel below ‘open’ ground or below public highways.
We carried out the ground investigations using boreholes. These provided information about soil types etc. Further studies were undertaken to confirm the location of underground services and the presence of deep foundations. Using this information we determined the final routes of the tunnels.
The tunnel will be approximately 45 metres (150 ft) below the surface, well below the depth of any service pipes or cables and the London Underground.
P.S.: And if you go to see those works in the West Reservoir Centre, enter the building (a former water pumping station) and enjoy a cup of coffee in the new Waterfront Cafe’ on Sunday mornings. Really nice and relaxing place, opening hours 9 a.m. – 5 p.m.