The Intensity-Duration-Frequency (IDF) curve is a way to represent three dimensions in a two-dimensional space. This is an isoline map because each line represents the combination of rainfall intensity and duration that would produce the same amount of volume of rain. There are a series of these maps that are produced for different frequency periods. For example, a 2-year storm produces a different depth than a 50-year storm, and each will have an IDF curve.
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