In this study, the effects of potential evapotranspiration method on drought index results were evaluated using SC-PDSI. Monthly heat
index method, Penman-Monteith method, and Hargreaves equation were used as potential evapotranspiration method. SC-PDSI was
calculated using three potential evapotranspiration method at 56 stations and compared the results. As a result, it was confirmed that the
results by Penman-Monteith method and Hargreaves equation showed similar SC-PDSI calculation results without much difference,
and the result by monthly heat index method showed a relatively large difference. It was confirmed that the results of SC-PDSI and
drought situation judgment for the period of spring and winter season showed a big difference by the month. In conclusion, when
calculating PDSI in Korea, using Penman-Monteith method and Hargreaves equation will be able to express the drought situation well.