Variability of precipitation pattern and intensity are increasing due to the urbanization and industrialization which
induce increasing impervious area and the climate change. Therefore, more severe urban inundation and flood
damage will be occurred by localized heavy precipitation event in the future. In this study, we analyze the future
frequency based precipitation under climate change based on the regional frequency analysis. The observed
precipitation data from 58 stations provided by Korea Meteorological Administration(KMA) are collected and the
data period is more than 30 years. Then the frequency based precipitation for the observed data by regional frequency
analysis are estimated. In order to remove the bias from the simulated precipitation by RCP scenarios, the quantile
mapping method and outlier test are used. The regional frequency analysis using L-moment method(Hosking and
Wallis, 1997) is performed and the future frequency based precipitation for 80, 100, and 200 years of return period
are estimated. As a result, future frequency based precipitation in South Korea will be increased by 25 to 27 percent.
Especially the result for Jeju Island shows that the increasing rate will be higher than other areas. Severe heavy
precipitation could be more and more frequently occurred in the future due to the climate change and the runoff
characteristics will be also changed by urbanization, industrialization, and climate change. Therefore, we need prepare
flood prevention measures for our flood safety in the future.