Perspective View of the Arch under the New River at Bush Hill.

Perspective View of the Arch under the New River at Bush Hill. The arch is of brick; through it flows a small stream in a gutter. It carries two inscriptions, commemorating its rebuilding in 1682 and its being raised by one foot in 1725. The New River flows behind a wooden fence on top. Bush Hill is on the Edmonton border of Enfield. "The company was set up by Act of Parliament in 1606 to bring fresh water from springs near Ware to London. Construction began c1608/9 and was complete by 1613. The original course through Enfield differed considerably from the present course. A wide loop followed the course of the Cuffley Brook through Whitewebbs. The New River crossed the valley of Salmons Brook at Bush Hill by means of a lead and timber aqueduct. Another loop followed the course of Pymmes Brook through the Arnos Grove Estate. Further south, another loop made a wide detour via Wolves Lane, Devonshire Hill and White Hart Lane. The New River ended at New River Head at Clerkenwell from where the water was distributed to customers in the City of London and elsewhere.
In 1682 Salmons Brook (beneath the Bush Hill aqueduct) was cased in a brick culvert (the Clarendon Arch). The years 1784/8 saw a major operation to remove the Bush Hill aqueduct and replace it with the present earth embankment. In 1820 the Whitewebbs loop was shortened by the construction of a cast iron aqueduct (near Flash Lane) carrying the New River over the Cuffley Brook. . . " - http://www.enfield.gov.uk/Leisure%20&%20Culture/local%20history/Water%20Supply%20in%20Enfield%20A%20History.htm