The SP technique in conjunction wíth the injectíon of radioisotopic tracer 3H were used 00 the Saracuruna Dam (RJ) to determine hígh infiltration rate zon~ as well as the average penneability of the dam material. The results indicate the presence of zones of hígh permeability predomínantly concentrated on the right hand side of the damo SP measurements up to 20 mV were detected in several isolated areas, indicating zones of hígh permeability which were confmned índependently by the radioactíve tracer results. RESUMO Levantamentos pelos métodos do potencial espontâneo e de traçadores radioativos foram executados na Barragem de Saracuruna-RJ, com a fmalídade de determinar zonas de infIltração, bem como a permeabilidade média, em função das velocidades de deslocamento da nuvem radioativa. Os resultados obtidos permitiram comprovar a existência de vazamento na ombreira direita. InfIltrações ocorrem também pelo fundo da barragem, como indicam os potenciais de até 20mV aí encontrados.
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