The Northern Outfall Sewer (NOS) is a major

gravity sewer A gravity sewer is a conduit utilizing the energy resulting from a difference in elevation to remove unwanted water. The term ''sewer'' implies removal of sewage or surface runoff rather than water intended for use;''Design and Construction of San ...

which runs from Wick Lane in Hackney to

Beckton sewage treatment works Beckton Sewage Treatment Works, formerly known as Barking Sewage Works, is a large sewage treatment plant in Beckton in the east London Borough of Newham, operated by Thames Water. Since construction first began in 1864, the plant has been exten ...

in east London; most of it was designed by Joseph Bazalgette after an outbreak of

cholera Cholera is an infection of the small intestine by some strains of the bacterium '' Vibrio cholerae''. Symptoms may range from none, to mild, to severe. The classic symptom is large amounts of watery diarrhea that lasts a few days. Vomiting an ...

in 1853 and the "

Great Stink The Great Stink was an event in Central London during July and August 1858 in which the hot weather exacerbated the smell of untreated human waste and industrial effluent that was present on the banks of the River Thames. The problem had been m ...

" of 1858. Prior to this work, central London's drains were built primarily to cope with rain water, and the growing use of

flush toilet A flush toilet (also known as a flushing toilet, water closet (WC) – see also toilet names) is a toilet that disposes of human waste (principally urine and feces) by using the force of water to ''flush'' it through a drainpipe to another loca ...

s frequently meant that they became overloaded, flushing sewage and industrial effluent into the

River Thames The River Thames ( ), known alternatively in parts as the The Isis, River Isis, is a river that flows through southern England including London. At , it is the longest river entirely in England and the Longest rivers of the United Kingdom, se ...

. Bazalgette's

London sewerage system The London sewer system is part of the water infrastructure serving London, England. The modern system was developed during the late 19th century, and as London has grown the system has been expanded. It is currently owned and operated by Thames ...

project included the construction of intercepting sewers north and south of the Thames; the Southern Outfall Sewer network diverts flows away from the Thames south of the river. In total five interceptor sewers were constructed north of the Thames; three were built by Bazalgette, two were added 30 years later: *The northernmost (Northern High Level Sewer) begins on

Hampstead Hampstead () is an area in London, which lies northwest of Charing Cross, and extends from the A5 road (Roman Watling Street) to Hampstead Heath, a large, hilly expanse of parkland. The area forms the northwest part of the London Borough o ...

Hill and is routed past

Kentish Town Kentish Town is an area of northwest London, England in the London Borough of Camden, immediately north of Camden Town. Less than four miles north of central London, Kentish Town has good transport connections and is situated close to the open ...

and

Stoke Newington Stoke Newington is an area occupying the north-west part of the London Borough of Hackney in north-east London, England. It is northeast of Charing Cross. The Manor of Stoke Newington gave its name to Stoke Newington the ancient parish. The ...

and under Victoria Park to the start of the Northern Outfall Sewer at Wick Lane. *Two middle level sewers serve parts of central London and also join the Northern Outfall Sewer at Wick Lane: **One begins close to Kilburn and runs along Edgware Road,

Euston Road Euston Road is a road in Central London that runs from Marylebone Road to King's Cross. The route is part of the London Inner Ring Road and forms part of the London congestion charge zone boundary. It is named after Euston Hall, the family s ...

and past King's Cross, through

Islington Islington () is a district in the north of Greater London, England, and part of the London Borough of Islington. It is a mainly residential district of Inner London, extending from Islington's High Street to Highbury Fields, encompassing the ...

to Wick Lane. **The other runs from

Kensal Green Kensal Green is an area in north-west London. It lies mainly in the London Borough of Brent, with a small part to the south within Kensington and Chelsea. Kensal Green is located on the Harrow Road, about miles from Charing Cross. To the w ...

, under

Bayswater Bayswater is an area within the City of Westminster in West London. It is a built-up district with a population density of 17,500 per square kilometre, and is located between Kensington Gardens to the south, Paddington to the north-east, an ...

and along

Oxford Street Oxford Street is a major road in the City of Westminster in the West End of London, running from Tottenham Court Road to Marble Arch via Oxford Circus. It is Europe's busiest shopping street, with around half a million daily visitors, and ...

, then via

Clerkenwell Clerkenwell () is an area of central London, England. Clerkenwell was an ancient parish from the mediaeval period onwards, and now forms the south-western part of the London Borough of Islington. The well after which it was named was redis ...

and

Bethnal Green Bethnal Green is an area in the East End of London northeast of Charing Cross. The area emerged from the small settlement which developed around the Green, much of which survives today as Bethnal Green Gardens, beside Cambridge Heath Road. By ...

to Wick Lane. *Two low-level sewers stretch from west London: **One starts from near

Ravenscourt Park Ravenscourt Park or RCP is an public park and garden located in the London Borough of Hammersmith and Fulham, England. It is one of the Borough's flagship parks, having won a Green Flag Award. Stamford Brook and Ravenscourt Park tube stations ar ...

, passes under

Hammersmith Hammersmith is a district of West London, England, southwest of Charing Cross. It is the administrative centre of the London Borough of Hammersmith and Fulham, and identified in the London Plan as one of 35 major centres in Greater London ...

and

Kensington Kensington is a district in the Royal Borough of Kensington and Chelsea in the West of Central London. The district's commercial heart is Kensington High Street, running on an east–west axis. The north-east is taken up by Kensington Garden ...

Piccadilly Piccadilly () is a road in the City of Westminster, London, to the south of Mayfair, between Hyde Park Corner in the west and Piccadilly Circus in the east. It is part of the A4 road that connects central London to Hammersmith, Earl's Cour ...

, the

Strand Strand may refer to: Topography *The flat area of land bordering a body of water, a: ** Beach ** Shoreline * Strand swamp, a type of swamp habitat in Florida Places Africa * Strand, Western Cape, a seaside town in South Africa * Strand Street ...

Aldwych Aldwych (pronounced ) is a street and the name of the area immediately surrounding it in central London, England, within the City of Westminster. The street starts east-northeast of Charing Cross, the conventional map centre-point of the city ...

, the City and

Aldgate Aldgate () was a gate in the former defensive wall around the City of London. It gives its name to Aldgate High Street, the first stretch of the A11 road, which included the site of the former gate. The area of Aldgate, the most common use of ...

to Abbey Mills Sewage Pumping Station. **The second begins in Hammersmith, crosses under

Fulham Fulham () is an area of the London Borough of Hammersmith & Fulham in West London, England, southwest of Charing Cross. It lies on the north bank of the River Thames, bordering Hammersmith, Kensington and Chelsea. The area faces Wandswor ...

and then runs along the

King's Road King's Road or Kings Road (or sometimes the King's Road, especially when it was the king's private road until 1830, or as a colloquialism by middle/upper class London residents), is a major street stretching through Chelsea and Fulham, both ...

and

Cheyne Walk Cheyne Walk is an historic road in Chelsea, London, England, in the Royal Borough of Kensington and Chelsea. It runs parallel with the River Thames. Before the construction of Chelsea Embankment reduced the width of the Thames here, it fronted ...

from where it becomes an integral part of the

Thames Embankment The Thames Embankment is a work of 19th-century civil engineering that reclaimed marshy land next to the River Thames in central London. It consists of the Victoria Embankment and Chelsea Embankment. History There had been a long history of ...

. Western Sewage Pumping Station near Chelsea Bridge helps maintain the necessary gravity flow, taking sewage on along

Millbank Millbank is an area of central London in the City of Westminster. Millbank is located by the River Thames, east of Pimlico and south of Westminster. Millbank is known as the location of major government offices, Burberry headquarters, the ...

, the

Victoria Embankment Victoria Embankment is part of the Thames Embankment, a road and river-walk along the north bank of the River Thames in London. It runs from the Palace of Westminster to Blackfriars Bridge in the City of London, and acts as a major thoroughfar ...

and

Tower Hill Tower Hill is the area surrounding the Tower of London in the London Borough of Tower Hamlets. It is infamous for the public execution of high status prisoners from the late 14th to the mid 18th century. The execution site on the higher gro ...

, then north-east under

Whitechapel Whitechapel is a district in East London and the future administrative centre of the London Borough of Tower Hamlets. It is a part of the East End of London, east of Charing Cross. Part of the historic county of Middlesex, the area formed ...

Stepney Stepney is a district in the East End of London in the London Borough of Tower Hamlets. The district is no longer officially defined, and is usually used to refer to a relatively small area. However, for much of its history the place name appli ...

and Bow to Abbey Mills.Trench, R. and Hillman, E. (1984) ''London under London: A Subterranean Guide'' (London: John Murray), pp. 72–75. The flows from the two low level sewers are raised by some into the Northern Outfall Sewer at Abbey Mills Pumping Station to join the flows from the High and Middle Level sewers. The remaining sections of the NOS carry the sewage from Abbey Mills to the treatment plant at Beckton. The creation of the NOS was a massive undertaking, and involved the construction of both huge embankments and several bridges. Today, the eastern end of the Northern Outfall Sewer, running some from Wick Lane, Bow to Beckton has been landscaped to form a public footpath/cycleway called The Greenway with access points along its length.

References

External links

A website showing some of the pipework
{{coord, 51, 31, 44, N, 0, 0, 52, E, display=title, scale:20000 London water infrastructure Buildings and structures in the London Borough of Newham Subterranean London Thames Water

See also

References

External links