Use this dialog box to define a basin for stage storage analysis, from either surface contours or polylines.
This dialog box is accessed from the Stage Storage dialog box.
Specifies a name for the basin.
Enables you to define the basin by using all contours in a selected surface in the drawing. After you select this option, click Define to select the surface in the drawing. All contours in the surface are used in the basin definition. Surface contours must be visible in the surface style to use this option. For more information, see To Display Contours for Surface Stage Storage Volume Analysis.
Enables you to use one of the following methods of selecting polylines:
The options in this section of the dialog box become enabled when you select Define Basin From Polylines.
Extracts polylines from surface contours which you can then use to define the basin. After clicking the button, select the surface in the drawing and press Enter. Surface contours must be visible in the surface style to use this option. For more information, see To Display Contours for Surface Stage Storage Volume Analysis. When you click Define in the Define Basin From Entities dialog box, you can then select the polylines that were created to define the basin.
Specifies that selected entities are moved to a new layer. Enter the layer name.
Cleans up the drawing by deleting any entities that were created by the Extract Entities From Surface button, but which you do not select with the Define button.
Enables you to select polylines in the drawing to use to define the basin. After clicking the button, select the polylines in the drawing. These may be existing polylines in the drawing, or polylines that were extracted using the Extract Objects From Surface button.