The first section of the Navarre Canal is subdivided into two sections separated by a regulating basin.
- Section 1A has a total length of 1,935 metres and a design flow of 100 m3/s with a self-supporting rectangular section of reinforced concrete. On this section, there is an aqueduct with 7 arches and a total length of 312,40 metres.
- Section 1B spans 1,375 metres long, has a trapezoidal mass concrete section and a design flow of 45 m3/s. The second section of the Navarre Canal has a total length of 10,267 metres, a design flow of 45 m3/s and can reach flows of around 52 m3/s if needed on occasions.
Section 2 has three different subsections:
- The first section, which measures 1,600 metres and works using pressure created by the Erro syphon (920 m) and the Sierra de Gongolaz tunnel (580 m, built using traditional techniques).
- A middle section spanning 2,750 metres, this being an open-air free-flow section.
- The final section of the canal goes through the Zabalceta Tunnel (5,835 m, built using a double shield TBM), which uses a free-flow system. The tunnel feeds into the Monreal Dam, which is the second regulating basin.