Curvas de intensidade-duração-frequência (IDF) e obtenção dos parâmetros da equação de chuvas para o município de Vacaria/RS

Abstract

The hydraulic works as well as the drainage system of cities have their design based on a series of studies related to the management of water resources. Among them is the study of intense rainfall, which employs the equation of intense rainfall, which has its parameters determined according to data of maximum daily rainfall of the location, also known as the Chen type equation, and also provides the intensity-duration-frequency curve (IDF). The big issue is that, in the literature, these equations are outdated, because they are based on old data. Therefore, the present work consists in obtaining updated data of maximum rainfall for the municipality of Vacaria/RS for the last 14 years, in order to construct the IDF curve, as well as in obtaining the parameters of the heavy rainfall equation based on these current data. To this end, the data were applied to the Gumbel distribution. These results were compared with the equations and curves obtained in other works, where they met expectations, showing no significant disparity. For the disaggregation, the method of the relations of the Companhia Ambiental do Estado de São Paulo (CETESB) was used. By comparing the disaggregations with the hourly precipitation, it was concluded that the disaggregation used by CETESB overestimates the precipitation data for the municipality of Vacaria. It is important to emphasize that no publications referring to the study of intense rainfall for this municipality were found, in this sense this work may help to fill this gap.