This dialog is used to define sub-surface ground types and layers (sub-horizons). This dialog is accessible from the Sub Horizons Assignments dialog by pressing the plus (+) button next to Ground Layers.
Layer 1, 2, 3
Ground Type
Pick the material found in this layer.
C/L Depth
The depth from surface to the layer below. This control is disabled unless the ground type for the layer below is defined. Note that a zero depth or thickness is allowed.
If Use Surface is checked, then the depth is defined by a Reference Terrain surface (TIN), see below.
The bottom layer is assumed to be infinitely deep so no depth control is required.
