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With the occurrence of intense rainfall phenomena, the surplus water volume in reservoirs of hydropower plants needs to be drained, which usually implies in spillage of large stream discharge that can compromise the stability of slopes and hillsides downstream of the spillway. Appropriate technical solutions should therefore be used to minimize soil losses and damage to flora and fauna. One suitable technique for streambanks protection is the live rip-rap. The aim of this work is to describe the execution of a live rip-rap carried out in a section of the left bank of the Uruguay river downstream of the UHE Itá dam, from a brief design characterization to the results achieved two years after its execution. The monitoring of the work for qualitative analysis of the structure's behavior and the development of the plants was regularly done. Shrub and tree data were collected through the implantation of 6 permanent plots of 10,0 m in length and 1,7 m in height (17 m2). The first measurement campaign was carried out immediately after the execution of the work and the second after 24 months. The results obtained with this work confirm that live rip-rap is efficiently fulfilling with the mechanical protection of the slope two years after the intervention, no physical damage was observed in the structure and that vegetation is in full development and are contributing to increase stability of the structure through its root systems and canopies.

PROTEÇÃO FÍSICO-MECÂNICA DA BASE DE UMA ENCOSTA NA MARGEM DO RIO URUGUAI COM ENROCAMENTO VIVO