Santos, João FilipePortela, Maria Manuela2011-09-272011-09-272007Santos, J.F., & Portela, M. M. (2007). Estimation of monthly stream flows based on the sequential water budget technique applied to the Thornthwaite potential evapotranspiration. Proceedings of the River Basin Management IV, Kos (Greece), ISBN 978-1-84564-075-0http://hdl.handle.net/10400.26/1327In Portugal mainland, the measurement of stream flows started later then the measurement of the majority of the other hydrologic variables. Also the former measurements were not carried out systematically, thus resulting in stream flow series not only with several faults, but also with reduce length, circumstances that often compromise their utilization either for research or design purposes. Based on the records at sixteen Portuguese climatologic stations it is stressed that the sequential water budget technique applied to the Thornthwaite potential evapotranspiration may provide a stream flow evaluation model having in view the fulfilment but, especially, the extension of monthly flow data. As the number of parameters and the data requirements of the previous technique and model are relatively modest it is possible, by that way, to estimate monthly stream flows even in regions with scarce hydrologic information.engSequential water budgeThornthwaite evapotranspirationsPenman-Monteith evapotranspirationsEvaluation of monthly stream flowsconference object