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Jubilee River

October 21, 2023

The Jubilee River is a hydraulic channel in southern England. It is 11.6 km (7.2 mi) long[1] and is on average 45 metres (148 feet) wide.[2] It was constructed in the late 1990s and early 2000s to take overflow from the River Thames and so alleviate flooding to areas in and around the towns of Maidenhead, Windsor, and Eton in the counties of Berkshire and Buckinghamshire. It achieves this by taking water from the left (at this point eastern) bank of the Thames upstream of Boulter's Lock near Maidenhead and returning it via the north bank downstream of Eton.[3] Although successful in its stated aims, residents of villages downstream, such as Wraysbury, claim it has increased flooding in those locations.[4]

The Jubilee River at Slough Weir
[Interactive fullscreen map + nearby articles]
The Jubilee River runs through Buckinghamshire and Berkshire, parallel to the River Thames for 11 km. A variety of weirs and control gates allow for flow management during flood periods.

Construction Edit

Parts of the towns of Windsor, Eton and Maidenhead are prone to flooding, because they are built on the flood plain of the River Thames. The concept of a parallel channel which could take water from the Thames above Maidenhead and return it below Windsor was conceived in the 1980s, and became known as the Maidenhead, Windsor and Eton Flood Alleviation Scheme. When the ten regional water authorities were privatised, as a result of the Water Act 1989, responsibility for rivers passed to the National Rivers Authority, which soon afterwards submitted plans for a channel which would be 50 metres (160 ft) wide and 12 kilometres (7.5 mi) long. In October 1992 a planning enquiry was held to consider the proposals. During that enquiry, P. Ackers, one of the assessors, expressed grave doubts about the hydraulic modelling that had been used to justify the scheme, suggesting that it was too optimistic.[5]

The scheme did not receive government approval until 1995; around the same time, there was further reorganisation of the water industry, with the Environment Agency replacing the National Rivers Authority. Although Mr Ackers' concerns had not been addressed,[5] it commissioned the design and construction of the scheme as originally conceived, at a cost of £110 million.[6] Throughout the planning process, from initial feasibility studies to delivery of the project, Lewin, Fryer and Partners were the consulting engineers.[7] Principal works were the creation of the channel, various flow control mechanisms and bridges for road, rail and foot traffic.

 
Dorney Bridge

One of the challenges was the Dorney Bridge, built to take the channel beneath the Great Western Main Line. The 19th-century Brunel-designed railway embankment continued in use, carrying passenger and goods trains between London and destinations including South Wales, Cornwall and Bristol throughout construction.[8] The 12 m (39 ft) high embankment was stabilised along 30m of its length by freezing over a period of three months, using 175 brine tubes cooled to −25 °C (−13 °F). A tunnel was excavated through the frozen ground to just 50 millimetres (2.0 in) wider than the two 50 m (160 ft) long preformed concrete box sections, which were jacked through as the excavation proceeded.[9] This created a 23 m (75 ft) wide by 9.5 m (31 ft) high concrete culvert which can be seen from the Bath Road Bridge.[2]

 
Black Potts Viaduct

The channel also had to be taken through Black Potts Viaduct, a series of 13 brick arches carrying the Waterloo to Windsor railway line over the Thames flood plain. Protective concrete and blue brick barriers were built around the older brickwork to preserve the viaduct's structural integrity,[10] as well as to control gates to adjust the amount of water rejoining the Thames immediately downstream.

The 11.6 km (7.2 mi) channel involved complex civil engineering to deal with utility conduits, roads and railways, as well as ecological and social issues, entailing compulsory purchases, community lectures and consultations and a public enquiry. For example at Manor Farm a weir was constructed. Conception to fruition took about 20 years.

Water is admitted to the river through sluice gates at the upstream end of the channel near Taplow. This is normally controlled by measurements of the water levels below Boulters Lock and the estimated flow of the Thames at the Datchet gauging station near Windsor. The first serious test of the new structure occurred during the flooding of early January 2003, and revealed a number of defects in the design. With both the Boulters Lock levels and the Datchet flow indicating that the channel was needed, the Taplow sluices were opened briefly on 1 January, but were then shut again until 4 January, by which time the Boulters Lock levels were 2 feet 4 inches (0.71 m) above the target levels, and the flow at Datchet was some 320 cubic metres per second, 140 cubic metres per second above the recommended flow. A subsequent investigation revealed that the Environment Agency had known there were defects in the channel since November 2002, and this had been a major factor in not operating it correctly.[11]

When flood water was admitted to the channel, the flows were well short of its designed maximum flow capacity, and yet there was significant erosion of the banks in several places.[11] There was considerable erosion at the Taplow Sluice, due to the lack of a stilling basin; embankments at Marsh Lane were badly damaged; the weir at Manor Farm was bent in the middle; the protection on the downstream face of Slough weir was swept away; and in Datchet, the Myrke embankment nearly collapsed.[5] An independent assessment by the engineering consultancy WS Atkins identified that the actual capacity of the channel was around two-thirds of its design capacity, and factors affecting this were the banks being too low, the use of inappropriate materials, and failure to follow standard design criteria. A programme of repairs and upgrades to rectify the problems began, at a cost of £3.5 million, and took until 2006 to complete. The Environment Agency sued their lead design consultants for recovery of the remedial costs,[7] and were refunded £2.75 million in an out-of-court settlement, after they admitted that the design and construction were sub-standard.[5]

Name Edit

The name used during planning was the "Maidenhead, Windsor and Eton Flood Alleviation Scheme" (MWEFAS). The choice of a name for the river was put to the local population in a poll.[12] The result was a strong preference for 'Jubilee', as it was being completed in Queen Elizabeth's Golden Jubilee year of 2002 and one of the Queen's main residences is at Windsor Castle, in one of the three towns being protected by the scheme.

In use Edit

The watercourse was designed to look like a natural river;[13] its banks have artificially constructed wildlife habitats intended to replace those lost from the banks of the Thames during urban expansion in the 19th and 20th centuries. During construction 38 hectares (94 acres) of reed beds and 5 hectares (12 acres) of wet woodland were laid down and about 250,000 trees were planted.[2]

The river is well used by walkers, runners, swimmers, canoeists, wildlife enthusiasts and cyclists: a footpath combined with National Cycle Route 61 runs along virtually its entire length. A wide variety of bird life can be seen along the river, including green woodpeckers, cormorants, lapwing and red kites.

During flooding in the early months of 2014, some residents of Ham Island (in Old Windsor) and Wraysbury said that the Jubilee River had increased the height of the flooded Thames in those villages which, along with much of the river upstream of London, saw water levels unprecedented since 1947. Wraysbury had also suffered significant flooding in 2003.[4] The Environment Agency in the 2010s is undertaking a widening and dredging programme of Thames works to assist with downstream flows.[14][15]

See also Edit

References Edit

  1. ^ "Windsor & Eton Self Guided Walk Stage 4- Victoria Bridge to Jubilee River". Travellers Toolkit. from the original on 29 August 2010. Retrieved 21 March 2010.
  2. ^ a b c C. W. Nicol (2 July 2008). . The Japan Times online. The Japan Times Ltd. Archived from the original on 6 June 2011. Retrieved 20 April 2010.
  3. ^
  4. ^ a b "Wraysbury residents say Jubilee River is a 'disaster'". BBC News Online. 14 January 2014. from the original on 12 April 2018. Retrieved 5 July 2015.
  5. ^ a b c d Larcombe 2018.
  6. ^ Clover 2004.
  7. ^ a b Editor 2006.
  8. ^ "Projects: Dorney Bridge". British Drilling and Freezing Company Ltd. 2009. Retrieved 16 May 2020.
  9. ^ Allenby, Douglas; Ropkins, John W (17 October 2017). "Jacked Box Tunnelling" (PDF). Norwich Engineering Society. §6.2 Flood Relief Culvert, Dorney: Institution of Mechanical Engineers. p. 16. (PDF) from the original on 8 May 2019. Retrieved 8 May 2019.{{cite web}}: CS1 maint: location (link)
  10. ^ SR-group 2010.
  11. ^ a b "Royal Windsor Web Site January 2003 Floods and Jubilee River Bank Collapse". from the original on 19 August 2010. Retrieved 23 March 2010.
  12. ^ "The Relief Channel is Completed but is it up to it?". The Royal Windsor Web Site. from the original on 4 March 2016. Retrieved 15 October 2014.
  13. ^ "UK Rivers Guide Book Guide to the River Thames – Jubilee River". from the original on 3 May 2010. Retrieved 23 March 2010.
  14. ^ "Sky News 10 February 2014". from the original on 11 February 2014. Retrieved 11 February 2014.
  15. ^ "YBW". from the original on 6 May 2019. Retrieved 22 May 2019.

Bibliography Edit

  • Clover, Charles (7 October 2004). "Flood maps show extra 300,000 homes are now at risk". Daily Telegraph. from the original on 27 December 2017.
  • Editor (14 June 2006). "EA sues designers of failed Jubilee River flood defence". New Civil Engineer. from the original on 13 June 2020. {{cite web}}: |last= has generic name (help)
  • Larcombe, Ewan (22 December 2018). "Lessons from errors of the Maidenhead, Windsor and Eton Flood Scheme". Hinksey and Osney. from the original on 13 June 2020.
  • SR-group (11 January 2010). "Black Potts Viaduct and Bridge". Southern Railway e-mail group. from the original on 25 March 2019.

External links Edit

 
Wikimedia Commons has media related to Jubilee River.
  • Discussions and articles relating to the Jubilee River
  • Information on the Jubilee River and the floods of 2003
  • Information on the National Cycle Network and the Jubilee River
Next confluence upstream River Thames Next confluence downstream
Clewer Mill Stream (south) Jubilee River Colne Brook (north)

51°30′17″N 0°39′10″W / 51.5047°N 0.6527°W / 51.5047; -0.6527

October 21, 2023
jubilee, river, hydraulic, channel, southern, england, long, average, metres, feet, wide, constructed, late, 1990s, early, 2000s, take, overflow, from, river, thames, alleviate, flooding, areas, around, towns, maidenhead, windsor, eton, counties, berkshire, bu. The Jubilee River is a hydraulic channel in southern England It is 11 6 km 7 2 mi long 1 and is on average 45 metres 148 feet wide 2 It was constructed in the late 1990s and early 2000s to take overflow from the River Thames and so alleviate flooding to areas in and around the towns of Maidenhead Windsor and Eton in the counties of Berkshire and Buckinghamshire It achieves this by taking water from the left at this point eastern bank of the Thames upstream of Boulter s Lock near Maidenhead and returning it via the north bank downstream of Eton 3 Although successful in its stated aims residents of villages downstream such as Wraysbury claim it has increased flooding in those locations 4 The Jubilee River at Slough Weir Interactive fullscreen map nearby articles The Jubilee River runs through Buckinghamshire and Berkshire parallel to the River Thames for 11 km A variety of weirs and control gates allow for flow management during flood periods Contents 1 Construction 2 Name 3 In use 4 See also 5 References 5 1 Bibliography 6 External linksConstruction EditParts of the towns of Windsor Eton and Maidenhead are prone to flooding because they are built on the flood plain of the River Thames The concept of a parallel channel which could take water from the Thames above Maidenhead and return it below Windsor was conceived in the 1980s and became known as the Maidenhead Windsor and Eton Flood Alleviation Scheme When the ten regional water authorities were privatised as a result of the Water Act 1989 responsibility for rivers passed to the National Rivers Authority which soon afterwards submitted plans for a channel which would be 50 metres 160 ft wide and 12 kilometres 7 5 mi long In October 1992 a planning enquiry was held to consider the proposals During that enquiry P Ackers one of the assessors expressed grave doubts about the hydraulic modelling that had been used to justify the scheme suggesting that it was too optimistic 5 The scheme did not receive government approval until 1995 around the same time there was further reorganisation of the water industry with the Environment Agency replacing the National Rivers Authority Although Mr Ackers concerns had not been addressed 5 it commissioned the design and construction of the scheme as originally conceived at a cost of 110 million 6 Throughout the planning process from initial feasibility studies to delivery of the project Lewin Fryer and Partners were the consulting engineers 7 Principal works were the creation of the channel various flow control mechanisms and bridges for road rail and foot traffic nbsp Dorney BridgeOne of the challenges was the Dorney Bridge built to take the channel beneath the Great Western Main Line The 19th century Brunel designed railway embankment continued in use carrying passenger and goods trains between London and destinations including South Wales Cornwall and Bristol throughout construction 8 The 12 m 39 ft high embankment was stabilised along 30m of its length by freezing over a period of three months using 175 brine tubes cooled to 25 C 13 F A tunnel was excavated through the frozen ground to just 50 millimetres 2 0 in wider than the two 50 m 160 ft long preformed concrete box sections which were jacked through as the excavation proceeded 9 This created a 23 m 75 ft wide by 9 5 m 31 ft high concrete culvert which can be seen from the Bath Road Bridge 2 nbsp Black Potts ViaductThe channel also had to be taken through Black Potts Viaduct a series of 13 brick arches carrying the Waterloo to Windsor railway line over the Thames flood plain Protective concrete and blue brick barriers were built around the older brickwork to preserve the viaduct s structural integrity 10 as well as to control gates to adjust the amount of water rejoining the Thames immediately downstream The 11 6 km 7 2 mi channel involved complex civil engineering to deal with utility conduits roads and railways as well as ecological and social issues entailing compulsory purchases community lectures and consultations and a public enquiry For example at Manor Farm a weir was constructed Conception to fruition took about 20 years Water is admitted to the river through sluice gates at the upstream end of the channel near Taplow This is normally controlled by measurements of the water levels below Boulters Lock and the estimated flow of the Thames at the Datchet gauging station near Windsor The first serious test of the new structure occurred during the flooding of early January 2003 and revealed a number of defects in the design With both the Boulters Lock levels and the Datchet flow indicating that the channel was needed the Taplow sluices were opened briefly on 1 January but were then shut again until 4 January by which time the Boulters Lock levels were 2 feet 4 inches 0 71 m above the target levels and the flow at Datchet was some 320 cubic metres per second 140 cubic metres per second above the recommended flow A subsequent investigation revealed that the Environment Agency had known there were defects in the channel since November 2002 and this had been a major factor in not operating it correctly 11 When flood water was admitted to the channel the flows were well short of its designed maximum flow capacity and yet there was significant erosion of the banks in several places 11 There was considerable erosion at the Taplow Sluice due to the lack of a stilling basin embankments at Marsh Lane were badly damaged the weir at Manor Farm was bent in the middle the protection on the downstream face of Slough weir was swept away and in Datchet the Myrke embankment nearly collapsed 5 An independent assessment by the engineering consultancy WS Atkins identified that the actual capacity of the channel was around two thirds of its design capacity and factors affecting this were the banks being too low the use of inappropriate materials and failure to follow standard design criteria A programme of repairs and upgrades to rectify the problems began at a cost of 3 5 million and took until 2006 to complete The Environment Agency sued their lead design consultants for recovery of the remedial costs 7 and were refunded 2 75 million in an out of court settlement after they admitted that the design and construction were sub standard 5 Name EditThe name used during planning was the Maidenhead Windsor and Eton Flood Alleviation Scheme MWEFAS The choice of a name for the river was put to the local population in a poll 12 The result was a strong preference for Jubilee as it was being completed in Queen Elizabeth s Golden Jubilee year of 2002 and one of the Queen s main residences is at Windsor Castle in one of the three towns being protected by the scheme In use EditThe watercourse was designed to look like a natural river 13 its banks have artificially constructed wildlife habitats intended to replace those lost from the banks of the Thames during urban expansion in the 19th and 20th centuries During construction 38 hectares 94 acres of reed beds and 5 hectares 12 acres of wet woodland were laid down and about 250 000 trees were planted 2 The river is well used by walkers runners swimmers canoeists wildlife enthusiasts and cyclists a footpath combined with National Cycle Route 61 runs along virtually its entire length A wide variety of bird life can be seen along the river including green woodpeckers cormorants lapwing and red kites During flooding in the early months of 2014 some residents of Ham Island in Old Windsor and Wraysbury said that the Jubilee River had increased the height of the flooded Thames in those villages which along with much of the river upstream of London saw water levels unprecedented since 1947 Wraysbury had also suffered significant flooding in 2003 4 The Environment Agency in the 2010s is undertaking a widening and dredging programme of Thames works to assist with downstream flows 14 15 See also EditTributaries of the River Thames Meander cutoff List of rivers in England Waterways in the United KingdomReferences Edit Windsor amp Eton Self Guided Walk Stage 4 Victoria Bridge to Jubilee River Travellers Toolkit Archived from the original on 29 August 2010 Retrieved 21 March 2010 a b c C W Nicol 2 July 2008 The right way to reconstruct rivers The Japan Times online The Japan Times Ltd Archived from the original on 6 June 2011 Retrieved 20 April 2010 Environment Agency A map indicating the location and route of the Jubilee River a b Wraysbury residents say Jubilee River is a disaster BBC News Online 14 January 2014 Archived from the original on 12 April 2018 Retrieved 5 July 2015 a b c d Larcombe 2018 Clover 2004 a b Editor 2006 Projects Dorney Bridge British Drilling and Freezing Company Ltd 2009 Retrieved 16 May 2020 Allenby Douglas Ropkins John W 17 October 2017 Jacked Box Tunnelling PDF Norwich Engineering Society 6 2 Flood Relief Culvert Dorney Institution of Mechanical Engineers p 16 Archived PDF from the original on 8 May 2019 Retrieved 8 May 2019 a href Template Cite web html title Template Cite web cite web a CS1 maint location link SR group 2010 a b Royal Windsor Web Site January 2003 Floods and Jubilee River Bank Collapse Archived from the original on 19 August 2010 Retrieved 23 March 2010 The Relief Channel is Completed but is it up to it The Royal Windsor Web Site Archived from the original on 4 March 2016 Retrieved 15 October 2014 UK Rivers Guide Book Guide to the River Thames Jubilee River Archived from the original on 3 May 2010 Retrieved 23 March 2010 Sky News 10 February 2014 Archived from the original on 11 February 2014 Retrieved 11 February 2014 YBW Archived from the original on 6 May 2019 Retrieved 22 May 2019 Bibliography Edit Clover Charles 7 October 2004 Flood maps show extra 300 000 homes are now at risk Daily Telegraph Archived from the original on 27 December 2017 Editor 14 June 2006 EA sues designers of failed Jubilee River flood defence New Civil Engineer Archived from the original on 13 June 2020 a href Template Cite web html title Template Cite web cite web a last has generic name help Larcombe Ewan 22 December 2018 Lessons from errors of the Maidenhead Windsor and Eton Flood Scheme Hinksey and Osney Archived from the original on 13 June 2020 SR group 11 January 2010 Black Potts Viaduct and Bridge Southern Railway e mail group Archived from the original on 25 March 2019 External links Edit nbsp Wikimedia Commons has media related to Jubilee River Discussions and articles relating to the Jubilee River Information on the Jubilee River and the floods of 2003 Information about the habitat of the Jubilee River Information on the National Cycle Network and the Jubilee RiverNext confluence upstream River Thames Next confluence downstreamClewer Mill Stream south Jubilee River Colne Brook north 51 30 17 N 0 39 10 W 51 5047 N 0 6527 W 51 5047 0 6527 Retrieved from https en wikipedia org w index php title Jubilee River amp oldid 1041848172, wikipedia, wiki, book, books, library,

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