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In Romania, there are more than 200 dams realized during 1975-1990 from local materials, without any ulterior remediation or rehabilitations. Nowadays, many hydropower systems confront with infiltration through dams or lateral dikes, followed by unexpected erosions. In order to maintain the hydropower system active, the water level is drastically reduced, sometimes even with 10 m. Consequently, it means less water for the human necessities (water supply, irrigation), but mainly few resources to produce electric energy. The research paper starts by presenting the actual dams situation, structured on hydrographic basins. For the case study two hydropower lakes from Arges-Vedea hydrographic area that confront seepage through embankments were selected. In that area there are more than 100 lakes which confront with different functioning problems. The local geomorphologic structure and the water quality create an image of local functioning conditions. Further, there are briefly presented the mathematical and numerical models, elaborated as to establish the infiltration risk zones. The numerical model is tested and calibrated based on local conditions, showing the zone with erosion and infiltration risks. Finally, some conclusions, possibilities to extend the numerical model, the acknowledgements, and references are presented.

NEW SOLUTION IN REHABILITATION OF THE HYDRO-POWER SYSTEMS NOW IN RISK DUE TO THE INFILTRATION