The intensity – duration – frequency (IDF) curves play most important role in watershed management, flood control and hydraulic design of structures. Conventional method for calculating the IDF curves needs hourly rainfall data in different durations which is not extensively available in many regions. Instead 24-hour precipitation statistics were measured in most rain-gauge stations. In this study, scaling properties of extreme rainfall are examined to derive scaling IDF curves over different durations. This new method in comparison with traditional method is less computational steps and has lower parameters numbers which causes increasing in reliability of IDF curves. Scaling method was used to extract the IDF curves in rain-gauge station in Khuzestan province located in southwest Iran and results proved the efficiency and robustness of the scaling method. Also ability of scaling concept method was examined in constructing of regional IDF. Keyword: IDF curve, Design storm, Scaling properties rain, Scaling model
