The objective of this study is the analysis and derivation of the spatial rainfall Intensity-Duration-Frequency curve (IDF) relationship patterns in Singapore. The Rainfall-Intensity-Duration-Frequency curve (IDF curve) is one of the commonly utilized tools in the field of Water Resource Engineering. The IDF curve represents in graphical form the probability of occurrence of a given rainfall intensity. It is used to estimate the return period of a rainfall event or rainfall amount.