\chapter{Creating calculation profiles} \label{sec:CreatingCalculationProfiles}
The starting point for combining a surface line with a subsoil profile is that both contain only valid data.
 
Next to the surface line and a subsoil profile, a filling material needs to be given. 
This material will be assigned to all surfaces of the new calculation profile for which a matching surface could not be found within the given subsoil profile.
When a matching surface could be found within the given subsoil profile, the material of that surface will be assigned to the new one.

The goal of the combination is to create the final 2D-profile (= 2D-geometry + layer information) that is to be used in the calculation.

For stability calculations, this profile is used as is.
For piping calculations, this profile forms the base from which the 1D piping calculation profiles are obtained.
