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Revista Brasileira de Engenharia Agrícola e Ambiental

versión impresa ISSN 1415-4366


SOUZA, Rodrigo O. R. de M. et al. Intense rainfall equations for the state of Pará, Brazil. Rev. bras. eng. agríc. ambient. [online]. 2012, vol.16, n.9, pp.999-1005. ISSN 1415-4366.

The intense rainfall equations have been used as an important tool for design of hydraulic structures. Considering the lack of intense rainfall equations, this study aimed to determine the relations of intensity, duration and frequency of intense rainfall in the Pará State (Brazil), using the one-day rain disaggregation method. In this research rainfall data of 74 cities in the State of Pará were used, obtained from the Hydrological Information System of the National Water Agency-ANA. The equations of intensity-duration-frequency were adjusted and presented good adjustment with coefficients of determination above 0.99. Most stations (51.4%) showed intensity of precipitation between 90 and 110 mm h-1 for duration of 30 min and rainfall return period of 15 years. The highest rainfall intensities were in the region near the northeast coast of Pará State and southeast of the Marajo Island.

Palabras clave : rain; one-day rain disaggregation; intensity-duration-frequency; hydrology.

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