Offset-based parameters allow lateral slopes for the ballast wall and seat to be set by various ballast wall heights and seat offsets.

Parameter Description	Content Parameter	Parametric Value	InfraWorks Set/Read	Inventor	Revit
Ballast wall height	BallastWallHeight	The vertical distance of the ballast wall top above the seat top, at the intersection of the ballast wall front and the alignment. (A common parameter to slope-based and seat-offset-based parts.)	No/Yes	No	No
Ballast wall left height	BallastWallLeftHeight	The vertical distance of the ballast wall top above the seat top, at the left front edge of the ballast wall.	No/Yes	No	No
Ballast wall right height	BallastWallRightHeight	The vertical distance of the ballast wall top above the seat top, at the right front edge of the ballast wall.	No/Yes	No	No
Seat offset	SeatOffset	The vertical distance of the seat top below the origin’s elevation at the alignment.	No/Yes	No	No
Seat offset left	SeatOffsetLeft	The vertical distance of the seat top below the elevation of the origin at the left edge of the abutment.	No/Yes	No	No
Seat offset right	SeatOffsetRight	The vertical distance of the seat top below the elevation of the origin at the right edge of the abutment.	No/Yes	No	No

SeatOffsetLeft

Centerline of Bearing	BallastWallThickness
Offset Reference	BallastWallLeftHeight
SeatOffsetRight	SeatOffsetLeft
BallastWallRightHeight	CLBearingToBBW
SeatOffset	SeatWidth
BallastWallHeight