DETERMINATION OF IDF CURVE: COMPARATIVE STUDY BETWEEN THE BELL METHOD AND RAINFALL EQUATION IN THE CITY OF BREVES, PARÁ

Resumo

Urban drainage systems are often planned and designed using rainfall intensity equations.
These equations allow to estimate the maximum precipitation of heavy rainfall and may be obtained
through different methods based on the correlation of a few rainfall data, such as its duration, frequency
and distribution. One of those is the Bell’s method, used in this paper. However, the lack of pluviograph
records as well as short duration data in certain areas have pointed out to the use of pluviometry registers
and statistical models as alternatives to assist the design of drainage infrastructure. This paper aims to
investigate and compare the performances of the Bell’s method and the rainfall equation proposed by
Souza et al. (2012) for the city of Breves, in the State of Pará, Brazil. The study was carried out mostly
by the processing of rainfall data repositories of three meteorological stations situated in Breves using
periods of observation of 8, 11 and 26 years and its statistical analysis. The results obtained showed that
the Bell methodology and the intense rainfall equation for the estimation of maximum rainfall with small
return periods is applicable and consistent, considering the use of a large data series.