A 3D view of a typical spillway is shown in Figure 44.

Figure 44

Unlike the foundation and the chute, the thickness of the pier is generally not constant along the X-axis. The definition of the pier cannot rely on a single 2-D sketch extruded to a given thickness. The vertical profile in the XY plane and the horizontal section in the XZ plan must, therefore, be specified.  

Modeling the pier starts by activating the Spillway Pier command in the Model window. A window similar to the foundation and chute definition windows appears which shows the elevation profile (XY) of the foundation and the chute above. Figure 45 shows a typical vertical profile of a pier.

Figure 45