Describe the rainfall intensity-duration-frequency relationship. Write its importance?

The rainfall Intensity-Duration-Frequency (IDF) relationship is one of the most commonly used tools in water resources engineering, either for planning, designing and operating of water resource projects, or for various engineering projects against floods. The rainfall intensity–duration–frequency (IDF) curves are graphical representations of the probability that a given average rainfall intensity will occur within a given period of time. Providing mathematical relationship between the ___ _____ _______ _______ ___.
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