The Box_Shape trench cross-section symbol defines a trench with vertical walls and a slab at the top. The footing at the bottom is bounded by the outer edge of the walls. The symbol uses the following parameters:
1 - Inside left width
2 - Inside right width
3 - Footing thickness
4 - Inside depth
5 - Wall thickness
6 - Slab thickness
InsideLeftWidth - Distance from the center cardinal point to the extreme left cardinal points.
InsideRightWidth - Distance from the center cardinal point to the extreme right cardinal points.
FootingThk - Footing thickness of the trench.
InsideDepth - Inside depth of the trench.
WallThk - Wall thickness of the trench.
SlabThk - Slab thickness of the trench.