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This paper presents a scale effect evaluation by analyzing the rain and flow data in the nested catchments of Donato (1,1km), Turcato (19,4km) and Taboão (105,4km), in the Potiribu river basin, Brazil, from 1990 to 2003. Total daily, monthly and annual rainfall and flow values, and their mean, maximum and minimum values were analyzed. Frequency analysis was performed for the following variables: number of days with and without rain, daily rainfall, number of consecutive days without precipitation, and mean daily flow. Finally an attempt to establish a correlation between rainfall and flow was performed, in order to get a better understanding of this relation in the catchments studied. The results indicated that rainfall presents a similar behaviour in all catchments studied, regardless of size. However, different catchment scales, submitted to the same precipitation, provided different flow responses. For the cases studied, the maximum flow reduction increases with catchment size, while the maximum flow variations decrease with catchment size. No strong correlation between rainfall and flow was identified for monthly and annual intervals, although an increase with catchment size could be observed for the annual values

Avaliação do Efeito de Escala em Características de Chuva e Vazão em Sub-Bacias Embutidas da Bacia do Potiribu - RS