Define the geometry of the centerline of the duct with a sequence of parabolas defined by control points.

The parabolas connect to form a typical duct centerline for continuous girders. Low points of convex parabolas occur within spans and high points of concave parabolas occur over piers. The parameters are connect at inflection points.

Item	Description
Point	Lists the control point of the parabola. "IP" indicates the inflection point
Locatoin	Enter the horizontal location of the control point. Use the drop down list to select the unit of measure.
Offset	Enter the vertical offset of the control point. Use the drop down list to select the datum.