Veranicos em amparo de São Francisco, Sergipe – Brasil

The availability and seasonal distribution of rainfall in a given region are determining factors to justify the need to use irrigation for plants, studies on water supply for domestic and industrial use and its storage, as well as the occurrence of floods, the design of drainage channels, heavy rains and periods of drought, among many other applications. The objective of this study was to determine and group the summer intervals into different classes: 5 to 10 days; 11 to 15 days; 16 to 20 days; 21 to 25 days; 26 to 30 days and 31 days of duration for the city of Amparo de São Francisco - Sergipe between the years 1964-2020, in the rainy season corresponding to the months of April to July. The daily rainfall data were established in an electronic spreadsheet, by the sum of the monthly values of the rainy season. The years were classified as rainy, very rainy, dry, very dry and normal. The dry day was defined as the one that registered rainfall of less than 2 mm and the summer with five or more consecutive dry days. The biggest episodes of summers in the classes of 5-10 days and 11-15 days of duration, were registered in the month of April and May. The years with the highest rainfall rates showed lower frequency of dry spells, whereas in the years with lower rainfall, the highest incidences of dry spells were recorded. The methodology applied here allows simulating summer events with different durations and with high reliability.