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The Need for Reservoir Improvement in Vişeu River Basin in Order to Prevent Flooding, with Minimal Impact on Protected Areas. With one of the most asymmetrical drainage basins in Romania, Vişeu represents the birth place of numerous and violent flood waves which not only cause damage for the local population but are also the root cause of numerous other similar events along the way to Tisa collector river. The total exposure of the basin has to the air masses coming in from the West side of the European continent makes it possible for large quantities of precipitation to drain off the steep side of Marmureş Mountains towards the Vişeu River, either directly or through several powerful tributaries (Ruscova, Vaser, Ţâşla, Repedea, Dragoşul). The lack of any sizeable hydrotechnical installation (permanent installations) makes limiting the damage caused by flood waves almost impossible, leading to huge damage caused annually not only along the tributaries but along Vişeu as well. Any human intervention on the basin is extremely delicate due to the fact that both Marmureş Moutains Natural Park and Rodna Moutains National Park overlap with the basin almost entirely. Both natural parks are protected areas according to the Romanian legislation. After a study, it was concluded that a hydrotechnical intervention in the basin is possible with minimal effects on the habitat but with considerable financial gains both for local and county authorities due to flood damage limitation. The overlapping of protected area layers of different restriction levels with the proposed reservoirs shows a minimal impact on the environment and outstanding hydrotechnical advantages.

Keywords: Vişeu, flood wave, floods, protected areas, hydrotechnical instalations.