Dams and power plants

Majes-Siguas, Phase II

The Majes-Siguas Phase II project is the expansion and completion of the Majes-Siguas Special Project started in the 1980s in Peru. The objective of the project is to provide irrigation for desert wasteland on the Peruvian coast by diverting water from to the wet, mountainous region. The objective of the Phase II project is the expansion of the irrigable area from Phase I by 14,000 ha and the addition of 38,500 ha of new irrigable land.

The first phase of the project involved transporting water from the upper basin of the Colca river using the Condorama regulation dam, as well as the Tuti intake and the tunnel that runs between the basins of the Colca and Siguas rivers. Next, using the Pitay intake, water is captured and diverted to the irrigation area located on the right bank of the river. The Tuti intake and the diversion tunnel were oversized to accommodate the expected future total flow of the project, not just that of Phase I.

Special characteristics:

Phase II of the project involves expanding the capacity of the system by capturing and transporting water from the Apurimac river basin to the Colca river. To achieve this, Phase II involves the design of the following infrastructure:

Angostura dam: a CFRD dam over the Apurimac river with a height of about 80 m.

Pucara tunnel: diversion tunnel between the Apurimac and Colca rivers. It is 17 km long and designed for a maximum open-channel flow of 33 m3/s.

Lluclla intake: structure made of a floodgate comprised of 3 large radial gates and another smaller one for cleaning sediment. It is located in the Siguas river for intake and diversion of 25 m3/s towards the left bank of the river.

The rest of the water transported to the Siguas river is captured downstream by the Pitay intake for the 14,000 ha expansion of Phase I.

Lluclla-Siguas tunnel: designed for transporting 24 m3/s in open channel for irrigation of 38,500 ha on the left bank of the Siguas river. It is about 12 km long.

Irrigation system: Open-channel irrigation infrastructure for 38,500 ha on the left bank of the Siguas river. The system has the following elements:

Intake regulation reservoir: located at the outlet of the Lluclla-Siguas tunnel, with a regulation volume of 700,000 m3.

Main canal: 22 km long and designed for a maximum flow of 24 m3/s. It has seven distribution canals for distributing water to the secondary canals.

Secondary canals: start at the distribution canals of the main canal and transport water to the irrigation intakes. The canals are telescopic canals with trapezoidal crosssection.

Irrigation intakes: Divert irrigation water from secondary canal to each plot of land through irrigation pipes.

News

Ayesa comes top in the VII Awards for the Best Practices  in Sustainable Mobility
02/10/2019

Ayesa comes top in the VII Awards for the Best Practices in Sustainable Mobility

Ayesa to design the Jubail II desalination plant in Saudi Arabia for SEPCOIII
30/09/2019

Ayesa to design the Jubail II desalination plant in Saudi Arabia for SEPCOIII

CEO: ‘Andalusia needs a portfolio of major investment projects to compete at an international level’
23/09/2019

CEO: ‘Andalusia needs a portfolio of major investment projects to compete at an international level’

Ayesa participates in Bogotá’s most important environmental project to date to clean its river
28/06/2019

Ayesa participates in Bogotá’s most important environmental project to date to clean its river

Ayesa in 2018: 1.5% growth, 274 million euros in revenue and 24 million euros in EBITDA
13/05/2019

Ayesa in 2018: 1.5% growth, 274 million euros in revenue and 24 million euros in EBITDA

New edition of INGENIO, our corporate magazine
15/03/2019

New edition of INGENIO, our corporate magazine