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infection of the effluent; (2) frugal space requirements; (3) low cost; (4) simple operation; and (5) easy upgrades. He believed that CEPT was an excellent candidate for the first stage.

The 1989 Hong Kong Harbor cleanup plan called for a conventional primary treatment plant followed by a 30-km-long ocean outfall. This plan encountered strong opposition from local environmental groups and from Chinese authorities who opposed the export of pollution to Chinese waters. In 1994, the Hong Kong Environmental Protection Department asked Don Harleman to take part in an international review panel, which ultimately recommended using CEPT followed by ultraviolet disinfection and a shorter outfall whose location would be determined by a proposed model study. The Hong Kong government accepted these recommendations, and the Stone Cutters Island Sewage Treatment Works was inaugurated in 2001.

Don believed in good engineering to improve the quality of life and environment everywhere in the world. He loved traveling with his wife Martha and was a popular consultant throughout the United States and abroad. Besides Hong Kong, he worked in Hungary, Egypt, the Netherlands, Brazil, Puerto Rico, Australia, Portugal, Lebanon, China, Mexico, and Italy, where, beginning in the 1970s, he helped tackle the problems of the lagoon of Venice. In 1995, he joined a panel of experts to oversee the development of the environmental impact assessment of the system of tidal barriers proposed to protect the city and the lagoon from increasingly frequent, damaging floods. With typical conviction and aplomb, Don insisted on the highest standards, not only to protect the lagoon, but also to improve it. Don lived to see the project well into construction, and his beloved Venice was on his mind almost to the day of his death.

Don’s signature approach was to find an analytical solution to problems using simple geometry, followed by meticulous experimental confirmation, often followed by application to actual situations. His many published studies, along with his textbook, Fluid Dynamics, written with Jim Daily in 1966, propelled him to the forefront of his field and led to his election to the National Academy of Engineering in 1974, among many other honors. He was an honorary member of the American Society

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