Most hydrological analysis such as probability rainfall and rainfall time distributions have typically carried out based on hourly rainfall
and rainfall - runoff analysis have carried out by applying different periods of rainfall time distribution and probability rainfall. In this
study, to quantify the change of design flood due to the data type (hourly and minutely rainfall data) and the probability rainfall and
application of different data period to the rainfall time distribution, probability rainfall is calculated by point frequency analysis
according to data type and period and rainfall time distribution was calculated by Huff's quartile distributions. In addition, the change
analysis of design flood was carried out by rainfall - runoff analysis applying different data periods of design rainfall time distribution.
and probability rainfall. As a result, rainfall analysis using minute rainfall data was more accurate and effective than using hourly rainfall
data. And the design flood calculated by applying different data period of rainfall time distribution and probability rainfall made a large
difference than by applying different data type. It is expected that this will contribute to the hydrological analysis using minutely rainfall.