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The problem of flooding in a Watershed (Basin) or region is basically caused by natural conditions, such as relatively high rainfall, sloping topographic conditions and tidal influences. Human behavior is often also the cause of flooding problems, such as the location of settlements that are in the river borders or industries that dump waste directly into river bodies. Besides the problem of flooding can also be caused by not well organized river/drainage system or lack of maintenance of an existing river/drainage system. Furthermore, social problems include increasing demands for the availability of new and good residential environmental infrastructure. To overcome the problems as described above, before an activity such as build in a left/right inspection road planning, is need analysis rainfall data and make patterns of Intencity Duration Frequency (IDF) Curve to analysis of hydraulics in determining flood discharge plans. The results showed that the IDF pattern can be described as a form of rain return period curves in the Air Lakitan Watershed and the entry point for suitable environment to approach of technical analysis for flood control.