William was born in Derry, Ireland and was the eldest son of Alexander Binnie, the famous civil engineer. He was educated at Bradford Grammar School followed by Rugby School, of which he said "a worse school for a boy who ultimately hoped to follow in his father's footsteps as a civil engineer could hardly have been chosen". He received a degree in the natural sciences tripos from Trinity College, Cambridge in 1888 before spending a year studying Chemistry and Civil Engineering at the University of Karlsruhe in Germany.
Having finished his training in 1902, Binnie joined his father's engineering practice working primarily in water supply and hydro-electric power. He was made a partner of the firm in 1904 and a senior partner upon his father's death in 1917. His work included projects in Birkenhead, Belfast, Oxford, Kano, Singapore and Rangoon. Binnie served as the technical advisor to the British representative on the Central Commission for Navigation on the Rhine in 1922; as a member of the Great Ouse Drainage Commission in 1925 and of the Doncaster Area Drainage Commission in 1926. He worked on several projects involved with the River Nile in Egypt, acting as a commissioner for the heightening of the Aswan Dam during 1928 and advising on hydro-electric power generation possibilities on the river in 1937. Binnie was known for his extensive travels to see projects first hand. In 1940, at the age of 72, he travelled to Hong Kong to advise on a dam and reservoir project. During his return flight to France on a French airliner, France was overrun by German forces and the pilot diverted to Algiers to disembark the passengers. Left without any means of transport in an unfamiliar country that was soon to become hostile, Binnie was forced to work for his passage home. He signed on as an assistant to a Chinese cook aboard a collier bound for Gibraltar whose Turkish crew had mutinied and left the ship shorthanded. He eventually returned safely to Britain where he saw out the rest of the Second World War.
Professional institutions and honours
Binnie first entered the Institution of Civil Engineers as an associate member in 1892, becoming a full member in 1900 and serving as chairman of the ICE's committee on flooding in 1933. He was elected president of the ICE for the 1938-9 session, following in the footsteps of his father who was president for 1905-6. Binnie was also elected as president of the Institution of Sanitary Engineers in 1917 and of the Institution of Water Engineers in 1921. He served as chairman of the British sub-committee of the International Committee on Large Dams from 1933 to 1946. Binnie was also made an honorary member of the American Society of Civil Engineers and of the New England Waterworks Association. He was rewarded for his contributions to engineer by the French government by being made a chevalier of the Legion of Honour in 1948, yet was not honoured in any way by the British government.
Personal life
Binnie married Ethel Morse in 1900 with whom he had three sons. His eldest son, Geoffrey Morse Binnie was born on 13 November 1901 and would become a partner in his father's engineering practice. The elder Binnie retired to Tilehurst, Berkshire, where he died on 4 October 1949, his wife having predeceased him by two years. The Binnie & Partners engineering company continued practising in hydraulic engineering and was merged with Black & Veatch in 1995.