Heavy rainfall maps in Brazil to 5 year return period

  • Gabriela Rezende de Souza Departamento de Recursos Hídricos e Saneamento (DRS), Universidade Federal de Lavras (UFLA), Câmpus Universitário, Caixa Postal 3037, CEP 37200-000, Lavras, MG, Brazil.
  • Italoema Pinheiro Bello Departamento de Recursos Hídricos e Saneamento (DRS), Universidade Federal de Lavras (UFLA), Câmpus Universitário, Caixa Postal 3037, CEP 37200-000, Lavras, MG, Brazil.
  • Luiz Fernando Coutinho de Oliveira Departamento de Recursos Hídricos e Saneamento (DRS), Universidade Federal de Lavras (UFLA), Câmpus Universitário, Caixa Postal 3037, CEP 37200-000, Lavras, MG, Brazil.
  • Flavia Vilela Corrêa Departamento de Recursos Hídricos e Saneamento (DRS), Universidade Federal de Lavras (UFLA), Câmpus Universitário, Caixa Postal 3037, CEP 37200-000, Lavras, MG, Brazil.
DOI: https://doi.org/10.4136/ambi-agua.2403
Keywords: Gumbel frequency distribution, intensity-duration-frequency relationships, kriging

Abstract

This study created thematic heavy rainfall maps for Brazil, with durations of 5-, 30-, 60- and 120 minutes and 5 years of return period (T). The intensity-duration-frequency (IDF) relationships used were compiled from studies found in the literature (798 locations) and derived for 4411 rainfall gauges available in the Hidroweb information system, totaling 5209 rainfall data collected. To derive IDF relationships, Gumbel's probability distributions were used, with parameters estimated by the method of moments. Distribution adequacy was verified by the Kolmogorov-Smirnov test. Rainfall-intensity values obtained by IDF relationships were spatialized in Geographic Information Systems, allowing elaboration of the thematic maps. Thematic maps enable obtain rainfall intensities for places without rain gauge data and/or precarious time-series data. Therefore, these maps are a great tool for the design of hydraulic structures related to urban and rural micro-drainage.


Published
25/09/2019
Issue
Vol. 14 No. 5 (2019)
Section
Papers

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