The Engineer Souza Dias Dam, formerly known as the Jupiá Dam, is an embankment dam on the Paraná River near Três Lagoas in Mato Grosso do Sul, Brazil. It was constructed for hydroelectric power production, flood control and navigation. Studies on the dam and power plant began in 1951 which recommended the dam along with the Ilha Solteira Dam. The dam was inaugurated in 1968 and its generators were commissioned between 1969 and 1974.

Dam and reservoir

The Souza Dias Dam is a 53 m high and 5495 m long combination concrete gravity and embankment dam. The concrete power plant, navigation lock and spillway section of the dam measures 1040 m long while the earth-fill embankments flanking the concrete section measure 2070 m long on the right and 2385 m long on the left. The reservoir created by the dam has a 3.353 km3 capacity of which 900000000 m3 is active or "useful" storage. The reservoir has a catchment area of 470000 km2 and surface area of 330 km2. The dam's spillway contains 37 floodgates, each with a 1208 m3/s discharge capacity for a total discharge of 44696 m3/s. The average long-term flow at the dam is 6350 m3/s and the record maximum flow was 28943 m3/s which was reached on October 2, 1983. The dam's navigation lock is 210 m long, 17 m wide and affords transportation on the Paraná and Tietê Rivers. It was inaugurated January 1998.

Power station

The dam's power station contains 14 x 110.8 MW generators that are powered by Kaplan turbines for a total installed capacity of 1,551.2 MW. In addition, the power station contains two 5 MW service generators for powering the dam's facilities itself. Together, dam's generators are designed to discharge 6440 m3/s of water, bringing the total discharge capability of the dam to 50130 m3/s at a reservoir elevation of 280.5 m above sea level.