Editing Subterranean London (section)

==Water and waste==
The River [[Thames]] runs west–east through the centre of London. Many tributaries flow into it. Over time these changed from water sources to untreated sewers and disease sources.<ref name="pmid11751359">{{cite journal | author = Halliday S | year = 2001 | title = Death and miasma in Victorian London: an obstinate belief | journal = BMJ | volume = 323 | issue = 7327| pages = 1469–71 | pmid = 11751359 | pmc=1121911 | doi=10.1136/bmj.323.7327.1469}}</ref> As the city developed from a cluster of villages, many of the Thames tributaries were [[Subterranean rivers of London|buried or converted into canals]].

The rivers failed to carry all the [[sewage]] of the growing metropolis. The resulting health crisis led to the creation of the [[London sewerage system]] (designed by [[Joseph Bazalgette]]) in the late nineteenth century. It was one of the world's first modern sewer systems and is still in use today, having been designed to account for the city's continued growth.

The [[Thames Water Ring Main]] is a notable large-scale water supply infrastructure, comprising 80&nbsp;kilometres of wide-bore water-carrying tunnels.

The [[Thames Tideway Tunnel]], due for completion in 2025, will be a  deep tunnel {{convert|25|km|abbr=on}} long, running mostly under the tidal section of the [[River Thames]] through central [[London]] to capture, store and convey almost all the raw [[sewage]] and [[rain]]water that currently overflows into the river.