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A hydrological drought index, MSWSI (Modified Surface Water Supply Index) was suggested based on SWSI. With the available data of spatially distributed gauge station of precipitation, dam storage, stream water level and natural groundwater level, South Korea was divided into 32 regions. This was conducted to represent the calculated index as a spatially distributed information. Monthly MSWSI was evaluated for the period of 1974 and 2001. It is necessary to compare this result with PDSI and SPI, and check the applicability of the suggested index in our hydrological drought situation.