Luís Romero Barbosa,Alain Marie Bernard Passerat de Silans,Cristiano Das Neves Almeida, Universidade Federal da Paraíba, Dep. de Eng. Civil e Ambiental, almeida74br@yahoo.com.br
ABSTRACT
This paper shows results from a study carried out for a representative watershed. Firstly, every subdaily measured rainfall event was classified into a synthetic hyetograph. Three rainfall gauges, located in the Gramame watershed, were considered in this study, in order to identify similar features between them. The study was focused on seven years, in which rainfall data were collected from the three gauges. Rainfall events were classified into possible hyetograph shapes: rectangular, bimodal, unimodal, unimodal with left peak, unimodal with right peak and not characterized. For each gauge, statistical analyses were done considering different variables: rainfall duration, peak, accumulated rainfall, initial time and intensity. The results showed that most of events were classified as rectangle shape. It was possible to correlate synthetic hyetograph with duration, peak and accumulated rainfall. Some results were similar for the different gauges. The results also show that the classification does not depend on the yearly rainfall.
Key words: representative watershed, subdaily events, rainfall data.