Comparing the Effective Drought Index and the Standardized Precipitation Index

Abstract

In this study, the performances of the Effective Drought Index (EDI) and 1-, 3-, 6-, 9-, 12- and 24- month Standardized Precipitation Indices (SPIs) were compared for drought monitoring data accumulated over 200-year period from 1807 to 2006 for Seoul, Korea. The results confirmed that the EDI was more efficient than the SPIs in assessing both short and long-term droughts.