John Duncan Watson (7 March 1860 – 1946) was a British civil engineer.
[3] At Birmingham he was responsible for the construction of the first large-scale percolating filter plant, a complete departure from the traditional land treatment in use in the city and elsewhere.
[1] Other changes that he introduced, based on his work in Birmingham, were the separation of sludge digestion, the extraction of methane from sewage for use in power generation and the introduction of flocculation prior to the percolating filter.
[4] Watson became General Manager of Birmingham Agricultural College by 1920 where he undertook investigations into tuberculosis in cattle.
[5] In his retirement he joined his son, David Mowat Watson, who was also a member of the ICE, in his private engineering consultancy practice.