Intense rainfalls prediction models for the state of Mato Grosso, Brazil

  • Luiz Fernando Coutinho UFLA
  • Marcelo Ribeiro Viola Universidade Federal de Tocantins
  • Sidney Pereira Instituto Federal do Norte de Minas Gerais
  • Nara Rúbia de Morais Universidade Federal de Goiás
Keywords: rainfall, Bell’s model, intensity-duration-frequency


Rain intensity data are necessary to increase security of hydraulic projects. The objective of this study was to determine the relationships among intensity-duration-frequency (IDF) and Bell’s model for the State of Mato Grosso, Brazil. The equations were obtained by disaggregation of 24 h rainfall data from 136 rain stations available in the National Water Agency (ANA) data base. Employing Gumbel distribution, the rainfalls were estimated for each time duration and for the return periods of 2, 5, 10, 25, 50 and 100 years, and thereafter for each season. The coefficients of IDF relationships and Bell’s models were adjusted by the minimum square method, for all seasons evaluated. The coefficients of determination and Willmott agreement index exceeded 0.98 and 0.85, respectively, for all stations, which classifies the adjustment of the rainfall models as great.

Author Biography

Luiz Fernando Coutinho, UFLA
Eng. Agrícola, Mestrado e doutorado em Engenharia Agrícola, Bolsista de Produtividade do CNPq, Coordenador do curso de graduação em Eng. Ambiental da UFLA