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Croton Aqueduct
The Croton Aqueduct was New York City's first major water-supply works, a 41-mile gravity-fed masonry conduit carrying water from the Croton River in Westchester to Manhattan reservoirs from 1842.
London sewer system
The London sewer system, or London sewers, drains London's wastewater through a network built by Joseph Bazalgette for the Metropolitan Board of Works between 1859 and 1875.