| Overview
The Yacyretá scheme is located approximately 1000 km north of Buenos Aires on the Paraná River, on the border of Argentina and Paraguay and was principally designed and constructed for power generation. The project includes a navigation lock, migratory fish transfer structures and irrigation intakes.
The Paraná River branches at the dam site to form the Yacyretá island, hence the spillway is comprised two structures, one either side of the island. The main spillway has a capacity of 55 000 m3/s through 18 bays controlled by tainter gates. The secondary spillway is on the Aña Cua branch, and has a capacity of 40,000 m3/s controlled by 16 tainter gates. Flows that exceed the generation capacity of the scheme are spilled via the Aña Cua spillway, providing environmental flows in that branch and minimising tailwater fluctuations in the main branch.
The first stage of the power plant contains 20 Kaplan turbines, each with a discharge capacity of 800 m3/s. With a head of 22m and an installed capacity of 3100 MW the project generates approximately 20,000 GWh/year.
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