Foz Tua Hydroelectrical Project

The dam is in a deeply embedded valley within a granite massif with a low level of alteration that is downstream of the installation, just beyond the EN212 road bridge in the direction of the mouth of the River Tua.

In addition to a reduction in the incline of the slopes and extension to the depth of the valley, there was an alteration to the massif from granite to schist formations.

The principle elements comprising this development were:

- A concrete dam;

- Central shaft and compact substation;

- Subterranean hydraulic system.

- The laying of access roads:

- Crowning of the dam;

- Pier water intakes;

- The return nozzles;

- Construction of a temporary diversion on the EN 212.

In the course of the project, a channel was excavated on the river-bed between the return and the mouth of the River Tua, the construction of an observation and control point, the works for the temporary river diversion comprising of two cofferdams (one upstream and one downstream) and an offshoot on the left bank.