Roman dam building got underway in large scale during the early imperial era. It mostly focused on the semiarid periphery of the empire, which includes the Near East, Hispania, and North African provinces. In Italy, only the Subiaco Dams, built by Emperor Nero for recreation, are known to exist; the greater quantity of Spanish dams below may be owing in part to more extensive fieldwork in that region. However, the remarkable height of these dams—which was not surpassed globally until the Late Middle Ages—makes them remarkable. The two most common types of dams were masonry gravity dams and embankment dams filled with dirt or rock. These fulfilled several different functions, including soil retention, irrigation, flood control, and river diversion. During the Concrete Revolution, waterproof hydraulic mortar—and particularly opus caementicium—was introduced, which increased the impermeability of Roman dams. Larger constructions were also made possible by these materials; two examples are the robust Harbaqa Dam and the Lake Homs Dam, which both have a concrete core and may be the largest water barrier in existence today. Roman architects were the first to use arches and buttresses into their dam designs because they understood their stabilizing power. Arch-gravity dams, arch dams, buttress dams, and multiple-arch buttress dams are among the hitherto undiscovered dam types brought by the Romans. #History#Architecture
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