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This “Settlement” option can be used to create a New Model from an existing model by using values of different levels.

Find this option here:   Main menu under Design => More => Settlement

I can see this being useful in two scenarios described below:

Scenarios A:

When multiple strings and control points have been surveyed. At a later date, the z-value at the control points is again measured and there is a major difference in the two z-value at each control point due to settlement or subsidence of the ground.

Scenario B:

When depths are given to you from bore hole logs and can be used to create a soil or rock strata model from your ground surface model.

See diagram below.

Click on link below to watch the video on how to create a Rock Strata Model described in Scenario B. 

Create Settlement Model or Rock Strata Model