[EN] This paper wants to emphasize the role that hydraulic technology had (especially in its innovative side from the beginning of 17th century) in the design of the irrigation system in Amadorio river basin, which collects the water of the southern slope of Aitana mountain range (Alicante). The design was made from the creation of a new medieval settlement on the coast (Vilajoiosa) and the main technological innovations derived, on the one hand, from the construction of the Relleu dam (in an interesting chapter in the spreading process of arc dams) and, on the other hand, from the attempts of capture the aquifer through the Font de l’Arc, which provided river Sella, the principal tributary of Amadorio.