InfoDrainage can import surface data from XYZS datasets.
*.XYZ files are plain-text ASCII format files commonly used to store point coordinates data and may use different delimiter characters, including, tab, space, and semicolon, among others. Each line or row corresponds to a point data, and every number between two delimiter characters in a line corresponds to a coordinate (X, Y or Z) of a point feature.
*.XYZS files can include breakline details after a further two delimiter characters as well as the X,Y and Z data.