TIDEWAY BUILDING FOR 22ND CENTURY LONDON
The History and Delivery of a £5Billion Super Sewer
John Gullick 3rd April 2019 History of London’s Sewer System Lost Rivers of London
Stoke River Roding Hampstead Newington
Islington Bow Barking Creek Black Notting Hill Ditch Erith
Waterloo Chelsea Woolwich
Battersea
Eltham Roehampton Forest Hill Streatham
Beverley Brook
8383 Main Sewers - 1856
Stoke Newington Hampstead Islington
Regents Park Bow Lake
Notting Hill Erith
Waterloo Chelsea Woolwich
Battersea
Roehampton Eltham Forest Hill Streatham
3 3288-05/127 Perception at the time
Source of Water Supply: for most of London, affordable water was extraction from the Thames Death’s Dispensary: but general belief was that disease was carried through the air and not water 4 4 The Great Stink of 1858
London Cholera Deaths 16000
14000
12000
10000
8000
6000
4000
2000
0 1831 1833 1848 Bazalgette’s plan Early Major Sewer Works
Northern Outfall Sewer under construction at Wick Lane 1860s
7 7 The Fleet Sewer – deepening and today Embankment
9 Integrated Works
10 The Need for the Tideway Project
1860 2 million 1910 4 million
2018 Bazalgette 9 million design capacity
11 8-9 million people 50 million cubic meters Strained ecosystem London’s Sewerage System Today
13 THE PROBLEM: Combined Sewer Overflow discharges
14 Combined & Separated Systems
15 Combined & Separated Systems
16 London’s sewerage network today
Percentage Connected
0-5 % Separate system 5-10 %
10-20 % Partially separate system 20-40%
40-70% Combined system 70-100%
17 Current situation
18 Intercepting the CSO’s
19 London Tideway Improvements
Beckton Riverside
Crossness
Long Reach Mogden
Sewage Works Upgrades Lee Tunnel Thames Tideway Tunnel
20 The Solution: Typical CSO Site
21 Impact of the Improvements
Typical Year CSOVolume Abbey Mills CSOvolume (cubic metres) Existing System –CSO volume (cubic metres)
5,000,000
19,418,500 4,000,000
3,000,000
2,000,000
1,000,000 Abbey Mills 0 (seeinset) Tideway CSO Hammersmith PS WesternPS
9
GreenwichPS
4
22 Impact of the Improvements
Typical Year CSO Volumes Abbey Mills CSOvolume (cubic metres) Thames Tideway Tunnel –CSO volume (cubic metres)
5,000,000
4,000,000
3,000,000
2,000,000
1,000,000 Abbey Mills 0 (seeinset) Tideway CSO
Hammersmith PS WesternPS No spill
9 GreenwichPS
4
23 Route Map and Geology Length: 25 kilometres Diameter: 7.2 metres
Depth: 30 metres to 66 metres Volume: 1.6 million cubic metres (include Lee Tunnel) Gradient: Falls one metre every 790 metres for self-cleansing 25 Existing sewerage network New reclaimed area
Air Treatment
Existing CSO
Vortex Shaft
Main Tunnel
Connection
Image: CSO interception TBM Drive Strategy
27 TBM drive site: Tunnelling set-up
28 Main Drive Site – Kirtling Street
29 Tunnel Boring Machines
30 Main Tunnel Blackfriars Chelsea Embankment Albert Embankment Victoria Embankment Falconbrook Questions ?