You can add an elevation-volume curve to a pond. The area-volume points defined in the curve are used to calculate pond volumes. The elevation-volume points defined in the table are used to calculate total pond volume. It is important that this storage relation be single-valued. This means that any volumetric quantity occurs only once in the table only, as CivilStorm interpolates linearly between any two values in the table. You define elevation-area curves in the Elevation-Volume Curve dialog box.

To add an Elevation vs. Volume curve to a pond:

1. Click a pond in your model to display the Property Editor, or right-click a pond and select Properties from the shortcut menu.
2. In the Physical section of the Property Editor, select Elevation-Volume Curve in the Volume Type field. The Elevation-Volume Curve field becomes available.
3. Click the Ellipses (...) button next to the Elevation-Volume Curve field.
4. In the Elevation-Volume Curve dialog box, each row in the table represents a point on the Elevation-Volume curve. Type values for Elevation, Volume, and Percent Void Space for each row. Click the New button to add a row or press the Tab key to advance to the next field in the table.
5. Perform the following optional steps:
6. To delete a row from the table, select the row then click Delete.
7. To view a report on the curve, click Report.
8. To view a plot of the curve, click Graph.
9. Click OK to close the dialog box and save your curve data in the Property Editor.

Elevation-Volume Curve Dialog Box

This dialog box allows you to define elevation-volume tables. The dialog box contains the elevation-volume table and the following buttons:

The table contains the following columns: