The Some?ul Cald dam was built in 1983, on the Some?ului Cald valley between two already existing accumulation lakes, Gil?u and Tarni?a. The accumulation was designed for energy purposes. From the Tarni?a lake, the water used by the hydroelectric plant at the foot of the dam, flows, through a concrete channel and after several hundred meters, it is poured into the tail of the Some?ul Cald accumulation lake.
The Gil?u lake arranged near the town of Gil?u takes over the water used by the hydroelectric plant located at the foot of the Some?ul Cald dam. Leaving the turbines the water reaches a concrete drain and after a journey of approx. 300 m, flows into the tail of the Gil?u accumulation lake. The lake here appeared by erecting a dam of 23 m, in 1971. At that time, without the lake Some?ul Cald, the waters came directly from the accumulation of Tarni?a.
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