The contract will be executed by a joint venture between FCC Construcción, Ramalho Rosa Cobetar and OPWAY

FCC will be responsible for the construction of the Ribeiradio and Ermida dams and the accesses to the Ribeiradio Dam, as well as for the restoration of highway EM 569 on the Vouga River, near Aveiro, for EDP (Energías de Portugal).

The main dam (Ribeiradio) will be a concrete gravity dam with a circular directrix, a 262-metre crest length, a maximum height of 74 metres and a volume of 230,000 cubic metres. The spillway will be made up of three 13-by-13-metre bays and equipped with segmented gates and a bottom outlet 2.5 metres in diameter. The stilling pool will consist of a concrete reservoir with a maximum height of six metres, located 135 metres downstream.

In order to generate the counter-dam, the Ermida dam will also be a concrete gravity dam, but its directrix will be straight. It will have a 175.1-metre crest length, a maximum height of 35 metres and a volume of 75,000 cubic metres. It will have a fixed-lip spillway and a 1.2-by-1.5-metre bottom outlet, and a 30-metre stilling pool will be provided. The hydroelectric plant will be equipped with two generators fed by independent hydraulic circuits that will cross through the body of the dam.

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