This research conducted over the extreme rainfall intensity - duration - frequency (IDF) relationship, covering return periods from 2 to 100 years. Therefore, this paper presents an analysis of extreme rainfall data from Makoran region, for durations from 15 minutes up to 12 hours. The results are compared with analysis by others of data from other countries, which served to highlight an anomaly in the longer duration results. The shorter duration results are still considered plausible and potentially useful pending more detailed analysis of longer data sets. The statistical analysis of shorter duration rainfall data indicated considerable flood alleviation purposes to that particular study area.