which many other sewers will flow - including the 6.9km-long Lee Tunnel. That drainage line is therefore deep, located way below the route of the River Thames - the city’s surface level natural catchment drainage channel. For the flows expected, Tideway is also a large diameter as well as long tunnel. Tunnel excavation finished three years ago, secondary
lining in 2023. The project is being delivered by three consortia: a
JV of BAM Nuttall, Morgan Sindall Infrastructure and Balfour Beatty on the west region; Ferrovial Agroman UK and Laing O’Rourke on the central region; and, the team of Costain, Vinci Construction Grands Projets and Bachy Soletanche is working on the east section. System integration is being delivered by Amey. Coming online fully this year, the 25km-long Tideway
tunnel will see Thames Water operate the system as part of its London wastewater network. The full London Tideway Tunnel network (including the Lee Tunnel) has a combined capacity of 1.6 million m3
the investment should virtually eliminate the harmful effects of sewage pollution in the Thames through central London.
Auckland Tunnelling on Watercare’s 16.2km-long Central Interceptor tunnel in Auckland is mostly complete. Much of the excavation has been performed by TBM
‘Hiwa-i-te-Rangi’, which last autumn reached the 30m-deep intermediate shaft in Western Springs - which was the original end point for the tunnel, at 13km long. It has twice been extended during the construction period and will end in Point Erin, Herne Bay, in Auckland. The other end of the Central Interceptor is at Māngere,
from where the TBM started its journey, in 2021. On the way to Western Springs, the machine crossed under Manukau Harbour and passed through the 110m-deep Hillsborough Ridge – the deepest section of the route. Preparations for the reception shaft at the Point Erin are underway.
March 2025 | 17 Left:
London also needs many sewer and water system improvements at smaller diameters
PHOTO CREDIT: BARHALE
Watercare signed the contract for the Central
Interceptor project with Ghella Abergeldie JV in 2019. The major investment is to significantly reduce wet
weather overflows and so improve water quality at Tāmaki Makaurau (Auckland) beaches and waterways. The Central Interceptor is 4.5m-diameter with a 1:1000 gradient to enable gravity flow from central Auckland to Māngere Wastewater Treatment Plant. Works on the project also include link sewers, which
have been completed. With the first section of the project about complete, the entire Central Interceptor is due to be finished in 2026.
and it is expected
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