You define the geometry of a polygonal element, such as a catchment or a pond, by entering the location and angle of bends for the selected element. You enter X vs. Y points that plot the shape of the polygon that represents the element in the Polygon Vertices dialog box.

You may have defined the geometry of a polygon element with some number of points (vertices) but you want to refine the shape by adding more vertices to the polygon or removing vertices. To add vertices, right click on an edge of the polygon and pick Bend > Add Bend. If you want to smooth the edge by removing points, pick on the point, right click and pick Bend > Remove Bend.

To define the geometry of a catchment or a pond:

1. Click a catchment or pond in your model to display the Property Editor, or right-click a catchment or pond and select Properties from the shortcut menu.
2. In the Geometry section of the Property Editor, click the Ellipses (...) button next to the Geometry field.
3. In the Polygon Vertices dialog box, click the New button to add a new row to the table.
4. Type values for X and Y points for each row in the table.
5. To remove rows from the table, click the Delete button.
6. Click OK.

Polygon Vertices Dialog Box

This dialog box lets you define X vs. Y points that plot the shape of the polygon that represents the selected element. The dialog box contains the X vs. Y table that allows you to define any number of points and the following buttons: