Sirolis supplied the prefabricated concrete elements for the construction of a hydraulic concrete passage, in a road profile, composed of box-culvert-type parts with a useful section of 3.5 x 3.5 m. The work also integrated wing walls to contain the slopes, ensuring structural stability and the continuity of road traffic. The technical rigor applied in the development and production of the parts guaranteed hydraulic efficiency, road safety and a resistant and long-lasting solution, with respect for the environment.