Editing Richmond Lock and Footbridge (section)

===Reasons for construction{{anchor|Richmond Footbridge Sluices, Lock and Slipway Act 1890}}===
{{Infobox UK legislation
| short_title           = Richmond Footbridge Sluices, Lock and Slipway Act 1890
| type                  = Act
| parliament            = Parliament of the United Kingdom
| long_title            = An Act to authorise the construction of a Footbridge with removable Sluices and a Lock and Slipway on the River Thames in the parishes of Richmond and Isleworth and for other purposes.
| year                  = 1890
| citation              = [[53 & 54 Vict.]] c. ccxxiv
| introduced_commons    = 
| introduced_lords      = 
| territorial_extent    = 
| royal_assent          = 14 August 1890
| commencement          = 
| expiry_date           = 
| repeal_date           = 
| amends                = 
| replaces              = 
| amendments            = 
| repealing_legislation = [[Port of London Act 1968]]
| related_legislation   = 
| status                = repealed
| legislation_history   = 
| theyworkforyou        = 
| millbankhansard       = 
| original_text         = https://www.legislation.gov.uk/ukla/Vict/53-54/224/pdfs/ukla_18900224_en.pdf
| revised_text          = 
| use_new_UK-LEG        = 
| UK-LEG_title          = 
| collapsed             = yes
}}
When the [[London Bridge#"Old" London Bridge (1209–1831)|London Bridge of 1209 to 1831]] was demolished the removal of its bulky and elaborate piers resulted in the tides upstream returning to the rapid flows as they were downstream and before its forming of a near-barrier. That bridge was particularly [[dam]]-like when it housed 200 buildings in the Tudor period and in depictions at the time of the [[Great Fire of London]] which spared the bridge. This change, together with dredging of the lower river (lowest reaches) and construction of Teddington Lock and weir, meant that for hours of each day the Thames at Richmond, Twickenham, Ham, Petersham and northern Teddington, was a shallow watercourse running past great mud and shingle banks. The exception was after weeks of above-average rainfall when the river is known as ''in spate'' however such outflow hinders navigation upstream.<ref>{{Cite web |url=http://www.pla.co.uk/assets/m51of2017-richmondlockweirdrawoff2017-weirsopen29thoctoberto19thnovember.pdf |title=Richmond Lock and weir draw-off 2017 |publisher = [[Port of London Authority]] |date = 1 June 2017|access-date = 30 April 2020}}</ref><!--See draw-off navigation advice, Port of London Authority, what is the draw off?-->  By the late 19th century water extraction above Teddington had increased to [[London water supply infrastructure#Water Treatment Works|four of five of the city's main waterworks]] and after light or normal rainfall more barges found it impossible to navigate the reach during and for hours around the two low tides each day.  In 1890, after many years of petitioning, an act of Parliament was enacted to build the half-lock and weir, the '''Richmond Footbridge Sluices, Lock and Slipway Act 1890''' ([[53 & 54 Vict.]] c. ccxxiv). This is among a small minority of Thames locks not to have been built around an island or islands (aits).

[[File:RichmondFootbridge.jpg|thumb|Richmond Footbridge]]