Abstract
One of the current challenges faced by hydrologic engineers refers to the estimation of the variables needed to promote adequate actions for water resources planning and management in ungauged watersheds. In order to deal successfully with such a challenge, techniques of spatial transposition of hydrological information, as exemplified by regional methods, are widely employed. In this paper, we describe our experience in conceiving regional models of flow duration curves for perennial, intermittent, and ephemeral rivers. In this context, we explore the use of the complement of the Extended Burr XII cumulative probability distribution function as a model for flow duration curves, because of its flexible shape and its adherence to empirical data, including to observed extreme flows. The regional models were built for two study regions with distinct climate patterns, in the Brazilian states of Minas Gerais and Ceara, thus including perennial, intermittent, and ephemeral rivers. The performance analysis revealed that, in general, the proposed models are able to adequately synthesize flow duration curves in ungauged watersheds, with minor restrictions to their applications in intermittent and ephemeral rivers
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