BESKOW, Samuel.; MELLO, Carlos R. de.; RIBEIRO, Moisés S.
Abstract:
The rainfall is an important meteorological variable for agriculture, it can determine the
type of agricultural activity of one region. In Brazil, as a general rule, the irrigation systems are
designed without taking natural rainfall into consideration, leading to design that can be unnecessary.
This work had as objectives to estimate the probable biweekly rainfall, to a probability of occurrence
of 75%, for Jequié-BA, using the Gama distribution, and to determine the parameters of this
distribution for each analyzed fortnight. The Gama distribution had a good fit to the biweekly rainfall
data, in accordance to the chi-square test. The parameters which were estimated for the Gama
distribution allow the user to estimate the minimum biweekly rainfall for different probabilities of
occurrence. With the generated data it was possible to conclude that the minimum biweekly rainfall
for Jequié-BA ranged from 0.20 to 13.20 mm, being possible the adoption of supplemental irrigation,
reducing the size of irrigation systems (energy consumption) and being able to increase the
profitability.
