View source for Engineering:Thames Barrier

{{Short description|Flood defence system for London, England}}
{{Infobox dam
| name = Thames Barrier
| name_official = 
| image = Thames Barrier 03.jpg
| image_size = 
| image_caption = View of the barrier gates, which are closed when a high tide is forecast
| image_alt = 
| location_map = 
| location_map_size = 
| location_map_caption = 
| location_map_alt = 
| coordinates = {{coord|51|29|49|N|0|2|12|E|display=inline,title}}
| country = United Kingdom
| location = [[Place:London|London]]
| purpose = F
| status = O
| construction_began = 1974
| opening = 8 May 1984
| cost = £534 million
| builder = {{plainlist|
*Costain
*Hollandsche Beton Maatschappij
*Tarmac Construction
*Tysons, Liverpool
*Cleveland Bridge & Engineering}}
| owner = 
| operator = Environment Agency
| dam_type = B
| dam_crosses = River Thames
| dam_height_foundation = 
| dam_height_thalweg = 20.1 [[Metre|metre]]s
| dam_length = 520 [[Metre|metre]]s
| dam_elevation_crest = 
| dam_width_crest = 
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| res_max_length = 
| res_max_width = 
| res_max_depth = 
| res_elevation = 
| res_tidal_range = 
| plant_name = 
| plant_coordinates = 
| plant_operator = 
| plant_commission = 
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| plant_turbines = 0
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}}
[[File:Thames Barrier London.jpg|thumb|300px|Far view of the River Thames Flood Barrier]]
The '''Thames Barrier''' is a retractable [[Earth:Flood barrier|barrier system]] built to protect the [[Earth:Floodplain|floodplain]] of most of Greater London from exceptionally high [[Astronomy:Tide|tide]]s and [[Physics:Storm surge|storm surge]]s moving up from the North Sea. It has been operational since 1982. When needed, it is closed (raised) during high tide; at low tide, it can be opened to restore the river's flow towards the sea. Built about {{convert|2|mi|abbr=off|}} east of the Isle of Dogs, its northern bank is in Silvertown in the London Borough of Newham and its southern bank is in the New Charlton area of the Royal Borough of Greenwich.

== History ==

=== Background ===
Flooding in London has been a problem since Roman times.<ref name=":1">{{cite journal |last=Kendrick |first=Mary |date=1988 |title=The Thames Barrier |journal=Landscape and Urban Planning |volume=16 |issue=1–2 |pages=57–68 |doi=10.1016/0169-2046(88)90034-5}}</ref> In 1954, the Waverley Committee, established to investigate the serious North Sea flood of 1953 which affected parts of the Thames Estuary and parts of London, recommended that "as an alternative to raising the banks, the possibility and cost of erecting a structure across the Thames which could be closed in a surge should be urgently investigated".<ref>

In 1966, Sir [[Biography:Hermann Bondi|Hermann Bondi]] was asked to take an independent view of the situation. He considered the estimated construction costs and the probability of a flood and of damage if the barrier was not built. He strongly recommended that a barrier should be built in order to avoid the catastrophe of flooding central London, and a site was agreed at Woolwich.<ref name=":0" />{{page needed|date=March 2021}}

The barrier protects central London against a [[Physics:Storm surge|storm surge]], caused when a deep depression forms to the north of Scotland and progresses across the North Sea and south-easterly towards southern Scandinavia. When such a surge coincides with a high spring tide, the high winds associated with the depression can funnel the water up the Thames Estuary and cause surges of up to 3.5 metres (11.6 feet). The planners assessed that in the absence of a barrier, such a surge could inundate 45 square miles (117&nbsp;km<sup>2</sup>) of land, put hospitals, power stations and the London Underground out of action and cause damage estimated in 1966 at £2 billion<ref>''The Thames Barrier: The Background and Basic Engineering Requirements''.  D Ayres Director of Public Health Engineering, GLC.  1983. Paper presented to a meeting of the Institution of Mechanical Engineers, 8th June 1983</ref> (about £50 billion at 2020 prices). The barrier was designed to provide a flood defence capable of resisting a once in 1000 year surge tide at a base date of 2030.

=== Design and construction ===
[[File:Thames Barrier - simple operation diagram.png|thumb|right|upright=1.2|Diagram showing how the gates work, though the barrier actually rises further than this to allow water to "underspill" under the barrier in a controlled fashion]]

The concept of the rising sector gates was devised by (Reginald) Charles Drapeer. In 1969, from his parents' house in Pellatt Grove, Wood Green, London, he constructed a working model. The novel rotating cylinders were based on the design of the [[Engineering:Tap (valve)|tap]]s on his gas cooker. The barrier was designed by Rendel, Palmer and Tritton for the Greater London Council and the concept tested at the Hydraulics Research Station, Wallingford.<ref name=":1" /> The site at New Charlton was chosen because of the relative straightness of the banks, and because the underlying river [[Earth:Chalk|chalk]] was strong enough to support the barrier.

The Thames Barrier and Flood Prevention Act, authorising construction, was passed in 1972.  In 1974 the GLC placed the two major construction contracts. Civil construction was undertaken by a Costain/Hollandsche Beton Maatschappij/Tarmac Construction consortium.<ref name=":0" />{{page needed|date=March 2021}} A separate contract for the gates and operating machinery was placed with the Davy Cleveland Barrier Consortium, formed by Davy McKee Ltd of Sheffield and Cleveland Bridge UK Ltd.<ref>{{cite web |url=https://www.gracesguide.co.uk/Davy_Cleveland_Barrier_Consortium |title=Davy Cleveland Barrier Consortium |author=<!--No author named.--> |date=30 July 2019 |website=Grace's Guide |url-status=live |archive-url=https://web.archive.org/web/20201124201649/https://www.gracesguide.co.uk/Davy_Cleveland_Barrier_Consortium |archive-date=2020-11-24}}</ref><ref name=":0" />{{page needed|date=March 2021}}

Work began at the barrier site in 1974 and progressed in two phases. The southern piers (9 to 6) were built first, with river traffic diverted to the north side, then traffic routed through the completed southern spans whilst the north side piers (1 to 5) were built. During construction of the piers, precast concrete sills were built in a [[Engineering:Cofferdam|cofferdam]] on the north side of the river and floated out and sunk between the piers to form the gate recesses, with access tunnels at the upstream and downstream ends.<ref>{{cite web |url=http://www.environment-agency.gov.uk/homeandleisure/floods/38355.aspx |title=Engineers and main contractors for the building of the Thames Barrier |author=<!--No author named.--> |publisher=Environment Agency |url-status=dead |archive-url=http://webarchive.nationalarchives.gov.uk/20090205134525/http://www.environment-agency.gov.uk/homeandleisure/floods/38355.aspx |archive-date=5 February 2009 |access-date=13 March 2021 }}</ref>

The gates of the barrier were fabricated in sections at Cleveland Bridge's Darlington works and assembled at Port Clarence on the River Tees.<ref>{{cite journal |last=Horner |first=R. W. |date=July 1979 |title=The Thames Barrier Project |journal=The Geographical Journal |volume=145 |issue=2 |pages=242–253 |doi=10.2307/634390 |jstor=634390}}</ref>{{rp|251}} The gates, gate arms and rocking beams were transported from the Tees to the Thames by barge and lifted into position by two very large floating cranes operated by Neptun of Hamburg (now part of Smit International).<ref>Manufacture and Installation of the Barrier Gates and Operating Machinery - P F Harvey, Davy Cleveland Barrier Consortium - Institution of Mechanical Engineers - Paper presented at a meeting on 8th June 1983.</ref> The mechanical and hydraulic machinery was built by Davy Loewy, Henry Berry and Vickers and trial assembled in Davy's Darnall works. Delays to the civil works required changes to the construction and installation sequence, but commissioning was relatively uneventful and the first trial operation of all the gates together was carried out on 31 October 1982.<ref>{{cite news |last=Clayton |first=Hugh |date=4 November 1982 |title=All 10 gates being raised at the Thames barrier |url=https://www.thetimes.co.uk/tto/archive/frame/article/1982-11-04/3/1.html |work=The Times |page=3 |access-date=2021-03-12}}</ref>

In addition to the barrier, the flood defences {{convert|11|mi|order=flip}} down river were raised and strengthened. The barrier was officially opened on 8 May 1984 by Queen Elizabeth II.<ref name=Guardian>{{cite news |title=Better way to turn the tide |newspaper={{wipe|The Guardian}} |date=9 May 1984 |page=2 |url=https://www.newspapers.com/image/259609689/}} {{subscription required|via=newspapers.com}}</ref> The barrier cost £{{Format price|461000000}} (£{{Format price|{{Inflation|UK-GDP|461000000|1984}}}} now).<ref name=Guardian />{{Inflation/fn|UK-GDP}} Total construction cost was around £534 million (£1.6 billion at 2016 prices) with an additional £100 million for river defences.{{citation needed|date=August 2019}}


=== Predictions for operation ===
A Thames Barrier flood defence closure is triggered when a combination of high tides forecast in the North Sea and high river flows at the tidal limit at Teddington Lock indicate that water levels would exceed {{convert|16|ft|m}} in central London. Though Teddington marks the Normal Tidal Limit, in periods of very high fluvial flow the tidal influence can be seen as far upstream as East Molesey on the Thames.<ref>{{cite news |last=de Castella |first=Tom |url=https://www.bbc.com/news/magazine-26133660 |title=How does the Thames Barrier stop London flooding? |work=BBC News |date=11 February 2014 |url-status=live |archive-url=https://web.archive.org/web/20200608223429/https://www.bbc.com/news/magazine-26133660 |archive-date=2020-06-08}}</ref>

{{wide image|Thames Barrier, London, England - Feb 2010.jpg|900px|The barrier from Silvertown on the north bank of the river during normal operation, looking across to New Charlton.}}
{{clear}}

=== Barrier closures and incidents ===

{| class="wikitable sortable" style="text-align:right; float:right; margin:0 0 1em 1em;"
|+ Closures per season (Sept–May) and&nbsp;flooding source 
|-
! Season 
! Tidal
! Combined <br> tidal/ <br> fluvial
! Total<br><ref name="GOV.UK">{{cite web |url=https://www.gov.uk/guidance/the-thames-barrier |title=The Thames Barrier |department=Environment Agency |website=GOV.UK |date=29 January 2021 |url-status=live |archive-url=https://web.archive.org/web/20210313032203/https://www.gov.uk/guidance/the-thames-barrier |archive-date=2021-03-13}}</ref>
|-
|1982–83
|1
|0
|1
|-
|1983–84
|0
|0
|0
|-
|1984–85
|0
|0
|0
|-
|1985–86
|0
|1
|1
|-
|1986–87
|1
|0
|1
|-
|1987–88
|0
|0
|0
|-
|1988–89
|1
|0
|1
|-
|1989–90
|1
|3
|4
|-
|1990–91
|2
|0
|2
|-
|1991–92
|0
|0
|0
|-
|1992–93
|4
|0
|4
|-
|1993–94
|3
|4
|7
|-
|1994–95
|2
|2
|4
|-
|1995–96
|4
|0
|4
|-
|1996–97
|1
|0
|1
|-
|1997–98
|1
|0
|1
|-
|1998–99
|2
|0
|2
|-
|1999–00
|3
|3
|6
|-
|2000–01
|16
|8
|24
|-
|2001–02
|3
|1
|4
|-
|2002–03
|8
|12
|20
|-
|2003–04
|1
|0
|1
|-
|2004–05
|4
|0
|4
|-
|2005–06
|3
|0
|3
|-
|2006–07
|8
|0
|8
|-
|2007–08
|6
|0
|6
|-
|2008–09
|1
|4
|5
|-
|2009–10
|2
|3
|5
|-
|2010–11
|0
|0
|0
|-
|2011–12
|0
|0
|0
|-
|2012–13
|0
|5
|5
|-
|2013–14
|9
|41
|50
|-
|2014–15
|1
|0
|1
|-
|2015–16
|1
|0
|1
|-
|2016–17
|2
|0
|2
|-
|2017–18
|3
|0
|3
|-
|2018–19
|3
|0
|3
|-
|2019–20
|9
|0
|9
|-
|2020–21
|2
|4
|6
|-
|2021–22
|7
|0
|7
|-
|2022–23
|2
|0
|2
|-
|2023–24
|1
|0
|1
|-
! Totals
|'''118'''
|'''91'''
|'''209'''
|}

{{As of|2023|November}}, there have been 209 flood defence closures.<ref name="GOV.UK" /> The barrier was closed twice on 9 November 2007 after a storm surge in the North Sea which was compared to the one in 1953.<ref>{{cite news |author=<!--No author named.--> |date=9 November 2007 |title=North Sea flood tide fears recede |url=http://news.bbc.co.uk/2/hi/uk_news/england/7086175.stm |work=BBC News |url-status=live |archive-url=https://web.archive.org/web/20200630014628/http://news.bbc.co.uk/2/hi/uk_news/england/7086175.stm |archive-date=2020-06-30}}</ref> The main danger of flooding from the surge was on the coast above the Thames Barrier, where evacuations took place, but the winds abated a little and, at the Thames Barrier, the 9 November 2007 storm surge did not completely coincide with high tide.<ref>{{cite web |url=http://www.pol.ac.uk/home/news/2007-11stormsurge.html |title=Surge of 9 November 2007-11-09 |author=<!--No author named.--> |date=9 November 2007 |department=[[Organization:Proudman Oceanographic Laboratory|Proudman Oceanographic Laboratory]] |publisher=Natural Environment Research Council |url-status=unfit |archive-url=https://web.archive.org/web/20120221223805/http://www.pol.ac.uk/home/news/2007-11stormsurge.html |archive-date=2012-02-21}}</ref>

On 20 August 1989, hours after the ''Marchioness'' disaster, the barrier was closed against a spring tide for 16 hours "to assist the diving and salvage operations".<ref name="maib-marchioness-3">{{cite report |url=https://www.gov.uk/maib-reports/collision-between-aggregates-dredger-bowbelle-and-passenger-vessel-marchioness-on-the-river-thames-england-resulting-in-marchioness-sinking-with-loss-of-51-lives |title=Report of the Chief Inspector of Marine Accidents into the collision between the passenger launch ''Marchioness'' and MV ''Bowbelle'' with loss of life on the River Thames on 20 August 1989 |date=5 June 1990 |publisher=Department of Transport, Marine Accident Investigation Branch |section=Part III |format=PDF |access-date=12 March 2021}}</ref>

The barrier has survived 15 boat collisions without serious damage.<ref name=telegraph-20140218>{{cite news |last=Hanlon |first=Michael |url=https://www.telegraph.co.uk/news/weather/10646439/The-Thames-Barrier-has-saved-London-but-is-it-time-for-TB2.html |url-access=subscription |title=The Thames Barrier has saved London – but is it time for TB2? |newspaper=The Telegraph |location=London |date=18 February 2014 |url-status=live |archive-url=https://web.archive.org/web/20161112091127/http://www.telegraph.co.uk/news/weather/10646439/The-Thames-Barrier-has-saved-London-but-is-it-time-for-TB2.html |archive-date=2016-11-12}}</ref>

On 27 October 1997, the barrier was damaged when the dredger MV ''Sand Kite'' hit one of the piers in thick fog. As the ship started to sink she dumped her 3,300-tonne load of aggregate, finally sinking by the bow on top of one of the barrier's gates, where she lay for several days. Initially the gate could not be closed as it was covered in a thick layer of gravel. A longer-term problem was the premature loss of paint on the flat side of the gate caused by abrasion. The vessel was refloated in mid-November 1997.<ref name="maib-sand-kite">{{cite report |url=https://www.gov.uk/maib-reports/contact-made-by-dredger-sand-carrier-sand-kite-with-the-thames-flood-barrier-river-thames-england-resulting-in-flooding-and-partial-sinking-of-vessel |title=Report of the Inspector's Inquiry into the collision of MV ''Sand Kite'' with the Thames Flood Barrier on 27 October 1997 |date=April 1999 |publisher=Department of the Environment, Transport and the Regions, Marine Accident Investigation Branch |format=PDF |access-date=12 March 2021}}</ref>

The annual full test closure in 2012 was scheduled for 3 June to coincide with the Thames pageant celebrating the Diamond Jubilee of Elizabeth II. Environment Agency said the pageant provided "a unique opportunity to test its design for a longer period than we would normally be able to", and performance under conditions of "a higher water level upstream than downstream"; also that the "more stable tidal conditions … in central London … will help the vessels taking part".<ref name="bbc-test-closure">{{cite news |title=Thames Barrier test closure to be on Jubilee pageant day |date=6 March 2012 |work=BBC News |url=https://www.bbc.com/news/uk-england-london-17266139 |url-status=live |archive-url=https://web.archive.org/web/20210313032146/https://www.bbc.com/news/uk-england-london-17266139 |archive-date=2021-03-13}}</ref>

=== Ownership and operating authority ===
The barrier was originally commissioned by the Greater London Council under the guidance of Ray Horner. After the 1986 abolition of the GLC it was operated successively by Thames Water Authority (dissolved 1989) and then the National Rivers Authority until April 1996 when it passed to the Environment Agency.

== Future ==
The barrier was originally designed to protect London against a very high flood level (with an estimated [[Return period|return period]] of one hundred years) up to the year 2030, after which the protection would decrease, while remaining within acceptable limits.<ref>{{cite web |url=http://www.environment-agency.gov.uk/homeandleisure/floods/105205.aspx |title=Managing flood water: The future |author=<!--No author named.--> |publisher=Environment Agency |url-status=dead |archive-url=http://webarchive.nationalarchives.gov.uk/20090606062958/http://www.environment-agency.gov.uk/homeandleisure/floods/105205.aspx |archive-date=6 June 2009 |access-date=25 November 2009 }}</ref> At the time of its construction, the barrier was expected to be used 2–3 times per year. By the mid-2000s it was being operated 6–7 times a year.<ref>{{cite report |author=World Heritage Centre |date=May 2007 |title=Climate Change and World Heritage |chapter-url=https://whc.unesco.org/en/series/22/ |publisher=[[Organization:UNESCO|UNESCO]] |chapter-format=PDF |location=Paris |chapter=Predicting and Managing the Impacts of Climate Change on World Heritage |page=29 |url-status=live |archive-url=https://web.archive.org/web/20200715032811/https://whc.unesco.org/en/series/22/ |archive-date=2020-07-15}}</ref> In the 2010s, the barrier was generally (as a median) closed twice a year but the average is still 6–7 due to the extreme of 50 times in 2013–14.

This defence level allowed for long-term changes in sea and land levels as understood at that time (c. 1970). From 1982 until 19 March 2007, the barrier was raised one hundred times to prevent flooding. It is also raised monthly for testing,<ref name="ThamesWeb2007">{{cite web |url=http://www.thamesweb.com/news_story.php?news_id=144 |title=Thames Barrier Clocks 100 Closures |author=<!--No author named.--> |date=19 March 2007 |website=ThamesWEB |publisher=Thames Estuary Partnership |url-status=unfit |archive-url=https://web.archive.org/web/20081223120826/http://www.thamesweb.com/news_story.php?news_id=144 |archive-date=2008-12-23}}</ref> with a full test closure over high tide once a year.<ref name="bbc-test-closure" />

Released in 2005, a study by four academics contained a proposal to supersede the Thames Barrier with a more ambitious 16&nbsp;km (10&nbsp;mi) long barrier across the Thames Estuary from Sheerness in Kent to Southend-on-Sea in Essex.<ref>{{cite news |last=Leake |first=Jonathan |date=9 January 2005 |title=Ten mile barrier to stop London flood |url=https://www.thetimes.co.uk/article/ten-mile-barrier-to-stop-london-flood-svs2r99x8xq |url-access=subscription |work=The Sunday Times |url-status=live |archive-url=https://web.archive.org/web/20210312210221/https://www.thetimes.co.uk/article/ten-mile-barrier-to-stop-london-flood-svs2r99x8xq |archive-date=2021-03-12}}</ref>

In November 2011, a new Thames Barrier, further downstream at Lower Hope between East Tilbury in Essex and Cliffe in Kent, was proposed as part of the Thames Hub integrated infrastructure vision. The barrier would incorporate [[Engineering:Tidal power|turbines to generate renewable energy]] and include road and rail tunnels, providing connections from Essex to a major new Thames Estuary Airport on the Isle of Grain.<ref>{{cite web |title=Thames Hub: An Integrated Vision for Britain |publisher=Foster+Partners, Halcrow, Volterra |url= http://www.halcrow.com/Thames-Hub/PDF/Thames_Hub_vision.pdf |archive-url=https://web.archive.org/web/20111110074451/http://www.halcrow.com/Thames-Hub/PDF/Thames_Hub_vision.pdf |url-status=dead |archive-date=10 November 2011}}</ref>

In a January 2013 letter to ''The Times'', a former member of the Thames Barrier Project Management Team, Dr Richard Bloore, stated that it was not designed with increased storminess and sea level rises in mind, and called for a new barrier to be looked into immediately.<ref>{{cite news |title=Letters to the Editor: Thames Barrier |url=https://www.thetimes.co.uk/article/thames-barrier-q3t8rr9r8hz |newspaper=The Times |date=3 January 2013 |url-status=live |archive-url=https://web.archive.org/web/20201128000605/https://www.thetimes.co.uk/article/thames-barrier-q3t8rr9r8hz |archive-date=2020-11-28}}</ref><ref>{{cite news |title=Thames Barrier engineer says second defence needed |url=https://www.bbc.com/news/uk-england-london-20904885 |work=BBC News |date=5 January 2013 |url-status=live |archive-url=https://web.archive.org/web/20210312154550/https://www.bbc.com/news/uk-england-london-20904885 |archive-date=2021-03-12}}</ref> The Environment Agency responded that it did not plan to replace the Thames Barrier before 2070,<ref>{{cite news |last=Cole |first=Margo |title=Environment Agency rejects calls for new Thames Barrier |url=https://www.newcivilengineer.com/archive/environment-agency-rejects-calls-for-new-thames-barrier-10-01-2013/ |url-access=limited |newspaper=New Civil Engineer |date=10 January 2013 |url-status=live |archive-url=https://web.archive.org/web/20210313022150/https://www.newcivilengineer.com/archive/environment-agency-rejects-calls-for-new-thames-barrier-10-01-2013/?tkn=1 |archive-date=2021-03-13}}</ref> as it was designed with an allowance for sea level rise of {{cvt|8|mm}} per year, which has not happened in the intervening years.<ref name="TBPP">{{cite web |title=Thames Barrier Project Pack 2012 |url=http://www.environment-agency.gov.uk/static/documents/Leisure/Thames_Barrier_Project_pack_2012.pdf |publisher=Environment Agency |url-status=dead |archive-url=http://webarchive.nationalarchives.gov.uk/20121206074724/http://www.environment-agency.gov.uk/static/documents/Leisure/Thames_Barrier_Project_pack_2012.pdf |archive-date=6 December 2012 |access-date=28 December 2012 }}</ref> At the time, the barrier was around halfway through its designed lifespan. The standard of protection it provides will gradually decline over time after 2030, from a 1-in-1000-year event. The Environment Agency is examining the Thames Barrier for its potential design life under climate change, with early indications being that subject to appropriate modification, the Thames Barrier will be capable of providing continued protection to London against rising sea levels.<ref name=telegraph-20140218 /><ref name="TBPP" />

Architects Lifschutz Davidson Sandilands and marine engineers Beckett Rankine launched a proposal for a pedestrian and cycle bridge located next to the Thames Barrier; the scheme, called the Thames Barrier Bridge, was promoted as the only location in east London where a low-level opening bridge across the Thames could have relatively moderate opening spans of about {{cvt|60|m}}.<ref>{{cite magazine |last=Horgan |first=Rob |date=3 June 2019 |title=Thames Barrier Bridge proposal revealed |url=https://www.newcivilengineer.com/latest/thames-barrier-bridge-proposal-revealed-03-06-2019/ |url-access=limited |magazine=New Civil Engineer |url-status=live |archive-url=https://web.archive.org/web/20210129121044/https://www.newcivilengineer.com/latest/thames-barrier-bridge-proposal-revealed-03-06-2019/ |archive-date=2021-01-29}}</ref><ref>{{cite news |last=Waite |first=Richard |date=3 June 2019 |title=Lifschutz Davidson Sandilands reveals Thames Barrier bridge plans |url=https://www.architectsjournal.co.uk/news/lifschutz-davidson-sandilands-reveals-thames-barrier-bridge-plans |work=Architects' Journal |url-status=live |archive-url=https://web.archive.org/web/20210313000533/https://www.architectsjournal.co.uk/news/lifschutz-davidson-sandilands-reveals-thames-barrier-bridge-plans |archive-date=2021-03-13}}</ref><ref>{{cite web |title=Thames Barrier Bridge |publisher=Lifschutz Davidson Sandilands, Beckett Rankine |url= https://www.thamesbarrierbridge.com/ |access-date=11 June 2019}}</ref>

== Gallery ==
<div align=center>
<gallery widths="220px" heights="180px" perrow="4">
File:Thames Barrier Gate Closing.JPG|One of the gates in underspill
File:thames.barrier.6.london.arp.jpg|Thames Barrier Pier 6
File:thames.barrier.3.london.arp.jpg|Gate in maintenance
File:thames.barrier.4.london.arp.jpg|Maintenance close up
File:thames.barrier.7.london.arp.jpg|Pier close up
File:Thames Barrier tunnel.jpg|Tunnel underneath the Thames Barrier between piers
File:Environment Agency 170114 103858a.jpg|Aerial view of the barrier (lowered)
File:Environment Agency 170114 133831.jpg|Aerial view of the barrier (raised)
</gallery>
</div>

== See also ==
*Barrier Gardens Pier
*Crossings of the River Thames
*Delta Works with the Oosterscheldekering
*[[Earth:Floodgate|Floodgate]]
*[[Earth:MOSE Project|MOSE Project]]
*Saint Petersburg Dam Flood Prevention Facility Complex
*Thames Barrier Park

== References ==
{{Reflist}}

== Further reading ==
*R. W. Horner (November 1987). "The Thames Barrier". ''IEE Proceedings A'' '''134''' (9): 752–760. {{doi|10.1049/ip-a-1.1987.0103}}.
*Ken Wilson (1984). ''The Story of the Thames Barrier''. London: Lanthorn. 32 pages. {{ISBN|978-0-947987-05-3}}. {{OCLC|60084379}}.

== External links ==
*[https://www.gov.uk/guidance/the-thames-barrier Official website]
*[http://www.streetmap.co.uk/newmap.srf?x=541250&y=179750&z=0&sv=541250,179750&st=4&mapp=newmap.srf&searchp=newsearch.srf Streetmap of Thames Barrier] {{Webarchive|url=https://web.archive.org/web/20141012052629/http://www.streetmap.co.uk/newmap.srf?x=541250&y=179750&z=0&sv=541250,179750&st=4&mapp=newmap.srf&searchp=newsearch.srf |date=12 October 2014 }}
*[https://www.london.gov.uk/what-we-do/environment/parks-green-spaces-and-biodiversity/parks-and-green-spaces/thames-barrier-park Thames Barrier Park page] from the Greater London Authority
*{{webarchive |url=https://webarchive.nationalarchives.gov.uk/20140328224801/http://www.environment-agency.gov.uk/homeandleisure/floods/105437.aspx |date=2014-03-28 |title=Other tidal defences in London}}, from the Environment Agency
*[http://risques.tv/video.php?id_DTvideo=269 ''Risques VS Fictions n°8''], filmed interview (subtitled in French) with Steve East, technical support team leader of the real barrier about the depiction of the barrier and scientific accuracy of ''Flood''.
*[https://www.pbs.org/video/sinking-cities-london-jzqg22/ Sinking Cities: London] 55min. PBS


[[Category:Coastal construction]]

{{Sourceattribution|Thames Barrier}}