HANSON Walter E. Hanson, a foundations expert and founder of the firm that became Hanson Professional Services Inc., a Springfield, Ill., engineer that ranks 174th on ENR’s list of The Top 500 Design Firms, died on April 4 in that city. He was 93. Hanson, who was the firm’s president for more than 30 years since its founding in 1954, specialized in foundation engineering and soil mechanics. A former engineering faculty member of the University of Illnois, Urbana-Champaign, he co-authored with noted experts Ralph Peck and Tom Thornburn “Foundation Engineering,” a textbook in those fields still widely used by students
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.