Burton S. Sperber was a “passionate and accomplished” magician, says the California landscape architecture firm he founded and ran for decades. But it was Sperber's vision and tough business skills, not magic, that built Valley Crest Landscape Cos., Calabasas, into the billion-dollar business it became before recession nipped its bottom line. Sperber, 82, died on Sept. 30 in Santa Monica, Calif., of complications from surgery, says the firm.With only a high school education and experience in his father's nursery, Sperber acquired a small landscape business in 1949 for $700 and was busy as post-WWII California boomed. Valley Crest helped its
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.