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Vyrnwy Aqueduct
Modernisation Programme
Katie Rowlands – Project Manager – United Utilities
Copyright © United Utilities Water Limited 2021 2
Fast facts
85 Km
https://uuhub.co.uk/vyrnwy/
of PE pipe to
be
purchased
£250
million
value of
the work
estimated
time to
complete
8
years
VAMP (Vyrnwy Aqueduct Modernisation Programme)
The Vyrnwy Aqueduct runs from Lake Vyrnwy through to
Merseyside. It was first installed in 1892 and has helped deliver
clean, wholesome drinking water to customers and
communities across Cheshire, Merseyside and the wider North
West region.
The aqueduct system comprises of three parallel pipelines,
referred to as Lines 1, 2 and 3. Each line is 42 inches (over 1
metre) in diameter and has a combined distance of 110km in
length.
The project is to Clean and Slipline a total of 139km (85km of
PE Pipe) across all 3 siphons by 31st December 2028.
What we do
139
Km
of pipeline
to be
modernised
Copyright © United Utilities Water Limited 2021 3
The history of the Vyrnwy Aqueduct
Liverpool corporation water works
Lake Vyrnwy
Lake Vyrnwy is a reservoir created in the 1880s by Liverpool Corporation Water Works to help
supply the growing city. Costing approximately £620,000 to construct (equivalent to over £70
million today).
The aqueduct system comprises of parallel pipelines built in phases:
• Line 1 cast iron constructed between 1881–1892
• Line 2 cast iron constructed between 1902-1905
• Line 3 steel constructed between 1926-1938
The treated water from Oswestry is then transported to the storage reservoirs at Prescot via these
huge underground pipes, passing through several tunnel sections, including underneath the River
Mersey and Manchester Ship Canal.
Construction in
the late 1920s
Copyright © United Utilities Water Limited 2021 4
Programme
Reducing risk and maximising ODI by accelerating siphon lines cleaning & lining
S1 – Clean & Slip
S2 - Clean
S2 – Accl. Slip Siphon 2 – Slip
S3 – Accl. Slip Siphon 3 – Slip
2023 2024 2025 2026 2027 2028
2022
2020 2021
Define
TRA
AMP7/AMP8
Copyright © United Utilities Water Limited 2021 5
Key Stakeholders
• 6 MP constituencies
• 6 Local planning authorities
• Knowsley
• St Helens
• Warrington
• Halton
• Cheshire West and Chester
• Cheshire East
• Elected members
• 26 ward council areas
• 37 parish council areas
• Other
• Landowners, occupiers and estates
• Delamere Forest
• Fiddlers Ferry
• Road, Rail, River, Waterways
• Whiston Hospital
• Schools & Sports Clubs
Copyright © United Utilities Water Limited 2021 6
• Line 3 Cleaned by end of 2023
• Line 1 & 2 Slip Lined by end of 2024
18.6km Length through rural Cheshire
64 Access Pits (Launch & Reception etc)
Railway / River Gowy / Shropshire Union Canal Crossing at Beeston
Lightfoot Lane Crossing – Eaton Village
Siphon 1 – Malpas to Cotebrook 2023- 2024
Copyright © United Utilities Water Limited 2021 7
• Line 3 Cleaned by end of 2024
• Line 1 & 2 Slip Lined by end of 2027
17.6km Length
55 Access Pits (Launch & Reception etc)
Railway Pipebridge / River Weaver / Runcorn Linnets Football Club
Delamere Forest
Siphon 2– Cotebrook to Norton 2023 - 2027
Copyright © United Utilities Water Limited 2021 8
• Line 3 Cleaning Not Required
• Line 1 & 2 Slip Line by end of 2027
15km Length – relining lines 1&2
50 Access Pits (Launch & Reception etc)
Bridgewater Canal Crossing / Fiddlers Ferry/ Cuerdley Railway
Crossing
Siphon 3– Norton to Prescot 2024 - 2027
Copyright © United Utilities Water Limited 2021 9
Copyright © United Utilities Water Limited 2021 10
What our work looks like

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The Vyrnwy Aqueduct Modernisation Programme webinar, 17 April 2024

  • 1. Vyrnwy Aqueduct Modernisation Programme Katie Rowlands – Project Manager – United Utilities
  • 2. Copyright © United Utilities Water Limited 2021 2 Fast facts 85 Km https://uuhub.co.uk/vyrnwy/ of PE pipe to be purchased £250 million value of the work estimated time to complete 8 years VAMP (Vyrnwy Aqueduct Modernisation Programme) The Vyrnwy Aqueduct runs from Lake Vyrnwy through to Merseyside. It was first installed in 1892 and has helped deliver clean, wholesome drinking water to customers and communities across Cheshire, Merseyside and the wider North West region. The aqueduct system comprises of three parallel pipelines, referred to as Lines 1, 2 and 3. Each line is 42 inches (over 1 metre) in diameter and has a combined distance of 110km in length. The project is to Clean and Slipline a total of 139km (85km of PE Pipe) across all 3 siphons by 31st December 2028. What we do 139 Km of pipeline to be modernised
  • 3. Copyright © United Utilities Water Limited 2021 3 The history of the Vyrnwy Aqueduct Liverpool corporation water works Lake Vyrnwy Lake Vyrnwy is a reservoir created in the 1880s by Liverpool Corporation Water Works to help supply the growing city. Costing approximately £620,000 to construct (equivalent to over £70 million today). The aqueduct system comprises of parallel pipelines built in phases: • Line 1 cast iron constructed between 1881–1892 • Line 2 cast iron constructed between 1902-1905 • Line 3 steel constructed between 1926-1938 The treated water from Oswestry is then transported to the storage reservoirs at Prescot via these huge underground pipes, passing through several tunnel sections, including underneath the River Mersey and Manchester Ship Canal. Construction in the late 1920s
  • 4. Copyright © United Utilities Water Limited 2021 4 Programme Reducing risk and maximising ODI by accelerating siphon lines cleaning & lining S1 – Clean & Slip S2 - Clean S2 – Accl. Slip Siphon 2 – Slip S3 – Accl. Slip Siphon 3 – Slip 2023 2024 2025 2026 2027 2028 2022 2020 2021 Define TRA AMP7/AMP8
  • 5. Copyright © United Utilities Water Limited 2021 5 Key Stakeholders • 6 MP constituencies • 6 Local planning authorities • Knowsley • St Helens • Warrington • Halton • Cheshire West and Chester • Cheshire East • Elected members • 26 ward council areas • 37 parish council areas • Other • Landowners, occupiers and estates • Delamere Forest • Fiddlers Ferry • Road, Rail, River, Waterways • Whiston Hospital • Schools & Sports Clubs
  • 6. Copyright © United Utilities Water Limited 2021 6 • Line 3 Cleaned by end of 2023 • Line 1 & 2 Slip Lined by end of 2024 18.6km Length through rural Cheshire 64 Access Pits (Launch & Reception etc) Railway / River Gowy / Shropshire Union Canal Crossing at Beeston Lightfoot Lane Crossing – Eaton Village Siphon 1 – Malpas to Cotebrook 2023- 2024
  • 7. Copyright © United Utilities Water Limited 2021 7 • Line 3 Cleaned by end of 2024 • Line 1 & 2 Slip Lined by end of 2027 17.6km Length 55 Access Pits (Launch & Reception etc) Railway Pipebridge / River Weaver / Runcorn Linnets Football Club Delamere Forest Siphon 2– Cotebrook to Norton 2023 - 2027
  • 8. Copyright © United Utilities Water Limited 2021 8 • Line 3 Cleaning Not Required • Line 1 & 2 Slip Line by end of 2027 15km Length – relining lines 1&2 50 Access Pits (Launch & Reception etc) Bridgewater Canal Crossing / Fiddlers Ferry/ Cuerdley Railway Crossing Siphon 3– Norton to Prescot 2024 - 2027
  • 9. Copyright © United Utilities Water Limited 2021 9
  • 10. Copyright © United Utilities Water Limited 2021 10 What our work looks like