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    Nant Ddu Aqueduct is a late 18th century, small aqueduct, constructed of squared stone, with a segmental arch 0.6m high with a span of 4.1m. The 2.4m of masonry above the arch give the water-immersed structure the appearance of a culvert.

    Aqueduct SN 7412 0577

    Stephen Hughes, 14.08,2006.