'Outfall of Westbourne', c1876. The River Westbourne, tributary of the River Thames carried pure drinking water into the City of London, in the 19th century, the water became impure and was culverted, the culvert is now known as the Ranelagh sewer . From "Old and New London: A Narrative of Its History, Its People, and Its Places. The Western and Northern Studies", by Edward Walford. [Cassell, Petter, Galpin & Co., London, Paris & New York]