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- Bottom river channel (B)
- Insert river channel (C)
- Dike toe at river (D)
- Dike top at river (G)
- Dike top at polder (J)
You may, of course add additional points to describe the real surface line.
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You get the real order the point, as shown in the drawings, by "Ctrl + click"
The program checks on a a malformed surface.
Messages will be displayed in the window "Validation messages".