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Abstract: The 510 MW hydropower project Cerro del Águila is currently under construction in the external Peruvian Andes. It includes a 80 m high gravity dam, a 7.6 km long headrace-tailrace tunnel system with a 10.5 m high, simplified horseshoe section, a 250 m high pressure shaft, a 40x86x18 m powerhouse cavern located 350 m underground, and various surge, access and construction tunnels. All...