author
Allen Hazen
1869–1930
A pioneering civil engineer, he helped shape modern thinking on clean water, filtration, and the movement of water through pipes. His work on hydraulics and public sanitation had a lasting influence on water systems in the United States and beyond.
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About the author
Born in 1869, Allen Hazen was an American civil engineer whose career focused on hydraulics, flood control, water purification, and sewage treatment. He became especially well known for work that influenced how engineers understand water flow and for important contributions to filtration and sedimentation.
Hazen studied civil engineering at the Massachusetts Institute of Technology, and his professional life was closely tied to the practical problems of growing cities: how to supply safe water and manage waste effectively. He also wrote extensively on sanitary engineering and became a respected leader in the field.
Today, he is often remembered for the Hazen-Williams equation and for helping establish engineering approaches that improved public health as well as infrastructure. He died in 1930, but his name still appears in the history of water engineering and environmental design.