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With the objective to analyze the hydrological processes and the water balance, a simplified water balance method and the modified Penman formula were applied to the Ribeirão da Onça river catchment in Colombo city, Paraná State. For the analysis, the data obtained during the monitoring period from 1997 to 2000 were utilized. The results showed that the values of the real evapotranspiration estimated by the method of the simplified water balance were negative for the certain periods and for other period sometimes more than those of the potential evapotranspiration estimated by the modified Penman formula. It implied the existence of significant groundwater recharge from other catchments to the study area, and indicates that the simplified water balance method was not suitable for the hydrological study of this karst catchment. The value of the groundwater recharge received by this catchment was estimated as 554 mm/year for the analysis period. O presente trabalho teve como objetivo analisar os processos hidrológicos e avaliar o balanço hídrico da bacia hidrográfica do Ribeirão da Onça, no município de Colombo/PR, área de manancial da Região Metropolitana de Curitiba, para o período de monitoramento existente, de 1997 a 2000. Os métodos utilizados foram o do balanço hídrico simplificado e de Penman modificado. O método do balanço hídrico mostrou-se inválido para estimar a evapotranspiração real da área de estudo, por produzir valores negativos e superiores a evapotranspiração potencial, permitindo inferir que em determinados períodos, o volume de recursos hídricos extraídos é superior ao índice de precipitação, o que leva a deduzir que existem áreas de recarga do aqüífero externa aos divisores superficiais da bacia. O balanço hídrico da bacia do Ribeirão da Onça permitiu identificar a contribuição da água subterrânea, onde a média anual recebida pela bacia para o período de 1998 a 2000, foi de 554 mm/ano

Water balance in karst: case study of the Ribeirão da Onça catchment in Colombo City, Paraná State - Brazil