Abstract
The Roman piles of Causses-et-Veyran have long been interpreted as towers and trophies as the remains of a wooden aqueduct. Recent discoveries help advance the hypothesis that these structures would belong to a hydraulic work constituted by a lead pressure pipe which had to cross awide valley according to the principle of communicating vessels. The topography of the ground not allow the establishment of a dynamic inverted siphon or the construction of an aqueduct bridge, the Roman engineers have partitioned this conduct in six sections by installing these " piles-relais". Those structures are a poorly known device whose operating principles are being applied in the Ottoman soutèrazi.
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