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Right click on the Data Grid and click Set Node Elevations.

Set Elevations Dialog

Adjust Elevation: Node elevations are adjusted by the specified value.

Constant Elevation: Node Elevations are set to the specified constant elevation.

Surface Elevation:

oSelect a Surface.

oSurface Elevation Operation:

oSet to Surface Elevation: Nodes are set to the surface elevation.

oAdjust Using Surface Elevation: The elevation obtained from the surface is added to the node elevation.

oNodes not overlying Surface (for nodes that do not overly the surface):

oRetain the existing node elevation.

oSet the elevation to Not a Number (NAN).

oApply elevation: The node elevations are set to the specified elevation.

Click OK.