Double water channels may have been used to maintain the system while enabling constant operation — ScienceDaily

Nancy J. Delong

Aqueducts are pretty extraordinary illustrations of the artwork of construction in the Roman Empire. Even today, they nevertheless provide us with new insights into aesthetic, simple, and technical elements of construction and use. Researchers at Johannes Gutenberg University Mainz (JGU) investigated the longest aqueduct of the time, the 426-kilometer-lengthy Aqueduct […]

Aqueducts are pretty extraordinary illustrations of the artwork of construction in the Roman Empire. Even today, they nevertheless provide us with new insights into aesthetic, simple, and technical elements of construction and use. Researchers at Johannes Gutenberg University Mainz (JGU) investigated the longest aqueduct of the time, the 426-kilometer-lengthy Aqueduct of Valens giving Constantinople, and uncovered new insights into how this structure was managed again in time. It seems that the channels experienced been cleaned of carbonate deposits just a couple many years right before the internet site was deserted.

The late Roman aqueduct furnished h2o for the inhabitants of Constantinople

The Roman Empire was ahead of its time in numerous strategies, with a potent motivation to create infrastructure for its citizens which we nevertheless obtain fascinating today. This features architecturally inspiring temples, theaters, and amphitheaters, but also a dense street community and extraordinary harbors and mines. “Even so, the most ground-breaking technical accomplishment of the Roman Empire lies in its h2o management, notably its lengthy-distance aqueducts that shipped h2o to cities, baths, and mines,” reported Dr. Gül Sürmelihindi from the Geoarchaeology group at Mainz University. Aqueducts have been not a Roman creation, but in Roman palms these lengthy-distance aqueducts created further more and thoroughly subtle during one of the most significant empires in background.

Almost every town in the Roman Empire experienced an sufficient offer of contemporary working h2o, in some circumstances really with a much larger volume than is the case today. “These aqueducts are largely acknowledged for their extraordinary bridges, these kinds of as the Pont du Gard in southern France, which are nevertheless standing today following two millennia. But they are most extraordinary due to the fact of the way issues in their construction have been solved, which would be complicated even for contemporary engineers,” reported JGU Professor Cees Passchier. Extra than two,000 lengthy-distance Roman aqueducts are acknowledged to date, and numerous additional are awaiting discovery. The review carried out by Dr. Gül Sürmelihindi and her investigate staff focuses on the most magnificent late-Roman aqueduct, the h2o offer strains of Constantinople, now Istanbul in current-working day Turkey.

Carbonate deposits provide insights into Byzantine h2o management

In Advert 324, the Roman Emperor Constantine the Good produced Constantinople the new cash of the Roman Empire. Though the town lies at the geopolitically essential crossroads of land routes and seaways, contemporary h2o offer was a trouble. A new aqueduct was hence created to offer Constantinople from springs sixty kilometers to the west. As the town grew, this program was expanded in the 5th century to springs that lie even a hundred and twenty kilometers from the town in a straight line. This gave the aqueduct a overall length of at least 426 kilometers, creating it the longest of the ancient environment. The aqueduct consisted of vaulted masonry channels large enough to walk by way of, created of stone and concrete, 90 large bridges, and numerous tunnels up to five kilometers lengthy.

Sürmelihindi and her staff researched carbonate deposits from this aqueduct, i.e., the limescale that fashioned in the working h2o, which can be used to receive essential data about h2o management and the palaeoenvironment at that time. The researchers found that the whole aqueduct program only contained slim carbonate deposits, representing about 27 decades of use. From the annals of the town, on the other hand, it is acknowledged that the aqueduct program worked for additional than seven-hundred decades, until finally at least the 12th century. “This indicates the whole aqueduct need to have been managed and cleaned of deposits throughout the Byzantine Empire, even shortly right before it ceased operating,” stated Sürmelihindi. Carbonate deposits can block the whole h2o offer and have to be eradicated from time to time.

Double construction over 50 kilometers was probably created for upkeep

Though the aqueduct is late Roman in origin, the carbonate found in the channel is from the Byzantine Middle Ages. This produced the researchers feel about feasible cleansing and upkeep tactics — due to the fact cleansing and fixing a channel of 426 kilometers implies that it simply cannot be used for months or months, while the town inhabitants is dependent on its h2o offer. They then found that 50 kilometers of the central part of the h2o program is produced double, with one aqueduct channel earlier mentioned the other, crossing on two-tale bridges. “It is pretty probably that this program was established up to allow for cleansing and upkeep functions,” reported Passchier. “It would have been a costly but simple solution.”

Sad to say for the investigate staff, it is no longer feasible to review the actual operation of the program. Just one of the most imposing bridges, that of Ball?germe, was blown up with dynamite in 2020 by treasure hunters who erroneously considered they could obtain gold in the ruins.

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