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.