IDF Curve Equation Input Dialog Box
This dialog allows you to define the return event and the a, b, and n coefficients that describe the storm using the following equation:
![](GUID-385CD98C-468E-4BD6-B2E9-5BB5F1AC9C35-low.png)
Where
![](GUID-393F5358-D148-4086-9B60-D0D1DDF79682-low.png)
Enter the Return Event and the values for the a, b, and n coefficients. Click the New button to add a row to the table, and Delete to remove the currently highlighted row.