Transport and water use

Sections 1 and 2 of the Navarre Canal

The Navarre Canal is a landmark project within the context of water resource planning in this region of Spain. The canal has a total length of 177 km, of which 145 km make up the main section and 32 km its branches. It allows 73,000 hectares to be irrigated and supplies drinking water to a population of 350,000 people.

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.

 

Location
Spain

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