This dialog allows you to define intensity-duration-frequency tables. These tables are stored in the Storm Data Groups Engineering Library, and can be used to define Global and local Storm Data (see "Adding Storm Data" for more information).

The table contains the following columns:

Label: Enter a label for the curve.

Return Event: The return event, a value that reflects the average time between similar storm data.

IDF Curve: Opens the "IDF Curve Dialog Box" , which allows you to define time vs. intensity curves that describe the current storm data.