Define Basin From Entities Dialog Box

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.

Basin Creation Parameters

Basin Name

Specifies a name for the basin.

Define Basin From Surface Contours

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.

Note: If you want to define the basin from selected contours instead of all contours, select the Define Basin From Polylines option, and then click Extract Objects From Surface.

Define Basin From Polylines

Enables you to use one of the following methods of selecting polylines:

• To select existing polylines in the drawing, select the Define Basin From Polylines option and then click the Define button at the bottom of the dialog box and select the polylines in the drawing.
• To define the basin from selected polylines that are extracted from surface contours, select the Define Basin From Polylines option and then use the options in the Polyline Method Options section of the dialog box. Then click Define to select the extracted polylines.

Polyline Method Options

The options in this section of the dialog box become enabled when you select Define Basin From Polylines.

Extract Objects From Surface

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.

Note: Whereas the Define Basin From Surface Contours option uses all of the surface contours for the input data, you can use the Extract Objects From Surface option to extract data from selected contours, for example, the contours that define a depression.

Change Selected Entities To The Following Layer

Specifies that selected entities are moved to a new layer. Enter the layer name.

Delete Unselected Entities On Selected Layers

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.

Define

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.