the discovery that forces us to rewrite the history of engineering

The old one city ​​of petrasculpted in the majestic reddish rocks of modern-day Jordan, has always captivated the world for its architectural monumentality. But the truth is that there was still much to discover here, and a recent team of archaeologists has focused on the bowels of its urban engineering and the ssystem they used to transport water in a desert environment.

The discovery. Archaeologists have unearthed astonishing evidence pointing to a water system of unprecedented sophistication in this region, and which has transformed the understanding of how the Nabataean civilization managed to thrive, and not just survive, in a very arid desert environment.

Where was it seen? This discovery has been published in the magazine Raise by the team led by archaeologist Niklas Jungmann where he has documented the findings in the ‘Ain Braq aqueduct after surveys that began in 2023. Now the researchers have been able to reveal a complex network of aquifer infrastructures that challenge previous conceptions about the hydraulic technology of antiquity in the Near East.

What has been seen? The epicenter of this astonishing discovery is the identification of a secondary conduit made up of lead pipes that extends approximately 116 meters. The point is that the presence of these lead pipes It is an extraordinarily rare phenomenon, especially outside the context of complex buildings or large Roman baths.

In Petra, this conduit was not a mere fortuitous pipe, but a highly precise piece of technology integrated into a system that combined open channels carved directly into the natural rock with these advanced metal conduits.

Its function. The function of this hydraulic system was to exhaustively regulate the pressure and flow of water. The researchers here point out that the lead section functioned mechanically as an inverted siphon, which is a great technical feat that allowed the water to overcome the pronounced unevenness in the terrain.

And with these levels it could be very easy for the pipes to collapse, but with the mechanism that they devised at the time, it made it possible to give pressure to the water and maintain the momentum wherever it passed.

More complex. Although this type of inverted siphon has attracted a lot of attention, nine conduits, a large reservoir, two cisterns and seven smaller tanks must also be added to the system. All this aimed at capturing scarce water, minimizing its evaporation and supplying the desert city.

Its evolution. The study goes further by pointing out that the aqueduct system experienced at least two major phases of development. The first was characterized by the use of lead, an expensive and demanding material. Here experts link this majestic work with the era of the Nabataean king Aretas IVindicating that this system would have been vital in supporting key monuments of the city, such as the Great Temple.

The second phase focused on the installation of a terracotta conduit next to the original. This transition to a much cheaper and easier to replace material demonstrates the flexibility and long-term technical efficiency of Nabataean engineering.

Its importance. Having found this evidence of a complex hydrological system forces historians and archaeologists to rethink the level of technological development in Petra. Beyond their famous rock-cut architecture, the Nabataeans were true masters of water.

And it is no wonder, because it was necessary to have a good infrastructure capable of challenge an unforgiving desert that could condemn those cities that did not know how to evolve and adapt to the conditions where they were developing.

Images | Brian Kairuz

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