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The Great Stink : ウィキペディア英語版
Great Stink

The Great Stink was an event in central London in July and August 1858 during 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 mounting for some years, with an ageing and inadequate sewer system that emptied directly into the Thames. The miasma from the effluent was thought to transmit contagious diseases, and three outbreaks of cholera prior to the Great Stink were blamed on the ongoing problems with the river.
The smell, and people's fears of its possible effects, prompted action from the local and national administrators who had been considering possible solutions for the problem. The authorities accepted a proposal from the civil engineer Joseph Bazalgette to move the effluent eastwards along a series of interconnecting sewers that sloped towards outfalls beyond the metropolitan area. Work on high-, mid- and low-level systems for the new Northern and Southern Outfall Sewers started at the beginning of 1859 and lasted until 1875. To aid the drainage, pumping stations were placed to lift the sewage from lower levels into higher pipes. Two of the more ornate stations, Abbey Mills in Stratford and Crossness on the Erith Marshes, are listed for protection by English Heritage. Bazalgette's plan introduced the three embankments to London in which the sewers ran—the Victoria, Chelsea and Albert Embankments.
Bazalgette's work ensured that sewage was no longer dumped onto the shores of the Thames and brought an end to the cholera outbreaks; his actions probably saved more lives than any other Victorian official. His sewer system operates into the 21st century, servicing a city that has grown to over eight million. The historian Peter Ackroyd argues that Bazalgette should be considered a hero of London.
==Background==

Brick sewers had been built in London from the 17th century when sections of the Fleet and Walbrook rivers were covered for that purpose. In the century preceding 1856, over a hundred sewers were constructed in London, and at that date the city had around 200,000 cesspits and 360 sewers. Some cesspits leaked methane and other gases, which often caught fire and exploded, leading to loss of life, while many of the sewers were in a poor state of repair. During the early 19th century improvements had been undertaken in the supply of water to Londoners, and by 1858 many of the city's medieval wooden water pipes were being replaced with iron ones. This, combined with the introduction of flushing toilets and the rising of the city's population from just under one million to three million, led to more water being flushed into the sewers, along with the associated effluent. The outfalls from factories, slaughterhouses and other industrial activities put further strain on the already failing system. Much of this outflow either overflowed, or was discharged directly, into the Thames.
The scientist Michael Faraday described the situation in a letter to ''The Times'' in July 1855: shocked at the state of the Thames, he dropped pieces of white paper into the river to "test the degree of opacity". His conclusion was that "Near the bridges the feculence rolled up in clouds so dense that they were visible at the surface, even in water of this kind. ... The smell was very bad, and common to the whole of the water; it was the same as that which now comes up from the gully-holes in the streets; the whole river was for the time a real sewer."〔 The smell from the river was so bad that in 1857 the government poured chalk lime, chloride of lime and carbolic acid into the waterway to ease the stench.
The prevailing thought in Victorian healthcare concerning the transmission of contagious diseases was the miasma theory, which held that most communicable diseases were caused by the inhalation of contaminated air. This contamination could take the form of the odour of rotting corpses or sewage, but also rotting vegetation, or the exhaled breath of someone already diseased. Miasma was believed by most to be the vector of transmission of cholera, which was on the rise in 19th-century Europe. The disease was deeply feared by all, because of the speed with which it could spread, and its high fatality rates.
London's first major cholera epidemic struck in 1831, when the disease claimed 6,536 victims. In 1848–49 there was a second outbreak in which 14,137 London residents died, and this was followed by a further outbreak in 1853–54 in which 10,738 died. During the second outbreak, John Snow, a London-based physician, noticed that the rates of death were higher in those areas supplied by the Lambeth and the Southwark and Vauxhall water companies. In 1849 he published a paper, ''On the Mode of Communication of Cholera'', which posited the theory of the water-borne transmission of disease, rather than the miasma theory; little attention was paid to the paper. Following the third cholera outbreak in 1854, Snow published an update to his treatise, after he focused on the effects in Broad Street, Soho. Snow had removed the handle from the local water pump, thus preventing access to the contaminated water, with a resulting fall in deaths. It was later established that the well from which the water was drawn had a leaking sewer running nearby.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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