Piers Editor

This editor is displayed when the (Ellipse) button is selected from the Piers field in the Bridge Opening Data Fields property sheet, and it enables you to define geometry and location data for piers within the bridge opening.

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The items which comprise the editor are described in the table below.

Item	Description
Piers	A list of all piers currently defined for the bridge opening is displayed in the Piers pane. You can use the grid to add or remove piers from the bridge opening. Item Description Pier ID An ID used to identify this pier. Offset from centre The horizontal offset of the pier relative to the centre of bridge opening. The pier is centred at the specified offset relative to the centre of the opening.
Pier Points	The geometry of a selected pier is displayed in the Pier Points pane. You can use the grid to add or remove the geometry for the points which comprise a pier. Item Description Pier ID The ID of the pier for which geometry is defined. The dropdown list contains the ID of all the piers specified in the Pier ID field. Level Height above datum. Width Width of pier at corresponding elevation. Roughness Manning's n Roughness value used when Roughness Type is set to N (Manning's n) Enter the n value for the Manning's equation. The roughness value applies between the point at which it is defined and the next point along the section. This means that the last value of Manning's n will have no effect, but it still needs to be defined.
Graph	A visual representation of the pier geometry specified in the Pier Points grid.
OK	Saves the definitions for the specified piers and closes the window.
Cancel	Closes the window. Any changes, which have not been saved, will be discarded.

To add piers to a bridge opening:

1. In the Piers pane, enter an alphanumeric identifier in the Pier ID field. This identifier must be unique for this particular bridge opening.
2. Enter the offset from the centre of the bridge opening to the centre of this pier.
3. Repeats Steps 1 and 2 for any other piers which are to be included in the bridge opening.
4. In the Pier Points pane, specify the points that comprise the geometry for one of the piers:
   1. Click on the Pier ID drop -down list.
   2. Select the identifier for the pier for which you want to specify the geometry.
   3. Specify the height above datum for this pier point in the Level field.
   4. Specify the width of pier (at this Level) in the Width field.
   5. Enter the n value for the Manning's equation in the Roughness Manning's n field.
   6. Repeat Steps a to e for any other points which comprise the geometry for this pier.
5. Repeat Step 4 for all other piers in this bridge opening.
6. Click OK to save the pier definitions and close the window.