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The article introduces an intensity-duration-frequency (IDF) equation for the city of Fortaleza from 30 years of pluviographic records (1970-1999) of the climatological station of the Federal University of Ceara. The equation was built based on annual series of maximum averages of rainfall intensities for durations of 5, 10, 20, 30, 45, 60 and 120 minutes. The case resulted from the analysis of 611 rainfall hyetograph observed in the period. In determining the parameters of the equation IDF was applied the Gumbel-Chow method. The data were adjusted to a Gumbel probability distribution function, and to defining the rain equation applied the method described by Wilken (1978). The equation is valid for return periods from 5 to 100 years and for rainfall durations up to 120 minutes. The results of the new equation were compared with values obtained by the application of three previous equations. The first two were developed in the 70’s and 80’s of the twentieth century, and the third, in year 2008.

Equação de chuvas para Fortaleza-CE com dados do pluviógrafo da UFC