SPATIAL ANALYSIS OF DROUGHT IN GROBOGAN REGENCY USING STANDARDIZED PRECIPITATION INDEX (SPI)

Abstract

This study aims to determine the spatial distribution of drought in Grobogan Regency using Standardized Precipitation Index (SPI). The data used is Grobogan rainfall data for 21 years (1994-2014) at 21 rainfallstations. The results showed that the incidence of droughts lasted for five months, from May to September. The peak of the drought occurred in August with SPI value of -1.53 to -2.51, a region with extremely dry category measuring 74394.37 hectares or 37.65% of study area and dry categories covering 123,191.6 hectares or 62.35% of study area.