The supported conduit shapes are shown in the subtopics below. Each shape is parameterized by one, two, or more characteristic dimensions as shown in the reference figure. In this model, a conduit is taken to be a prismatic (constant-shaped) conveyance segment that is defined by a single shape. Conduits do not have to be closed sections, so prismatic design channels can be modeled using conduit elements.

The allowable conduit shapes include: