Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilSurfaceProfile.cs
===================================================================
diff -u -r4540 -r5399
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilSurfaceProfile.cs	(.../SoilSurfaceProfile.cs)	(revision 4540)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilSurfaceProfile.cs	(.../SoilSurfaceProfile.cs)	(revision 5399)
@@ -362,6 +362,7 @@
     /// <returns>A collection of <see cref="EnclosedArea"/>.</returns>
     private static IEnumerable<EnclosedArea> GetEnclosedAreas(IReadOnlyList<Point2D> surfaceLinePoints, double topLevel, double bottomLevel)
     {
+        const double toleranceAlmostEqual = 1e-09;
         var currentArea = new EnclosedArea();
         var enclosedAreas = new List<EnclosedArea>();
 
@@ -380,16 +381,16 @@
                 currentZCoordinate = topLevel;
                 currentArea.AddCoordinate(new Point2D(xCoordinate, topLevel));
             }
-            else if (Math.Abs(zCoordinateSurfaceLine - bottomLevel) < GeometryConstants.Accuracy // Surface line is at layer bottom level
+            else if (Math.Abs(zCoordinateSurfaceLine - bottomLevel) < toleranceAlmostEqual // Surface line is at layer bottom level
                      || (zCoordinateSurfaceLine >= bottomLevel && zCoordinateSurfaceLine <= topLevel)) // Surface line is between the layer top and bottom level
             {
                 currentArea.AddCoordinate(new Point2D(xCoordinate, zCoordinateSurfaceLine));
             }
 
             // Determine if the current surface line point is located as a point on the horizontal line on the layer bottom level.
             // If yes, then a new area should be added
-            if (Math.Abs(zCoordinateSurfaceLine - bottomLevel) < GeometryConstants.Accuracy
-                && Math.Abs(nextSurfaceLineZCoordinate - bottomLevel) < GeometryConstants.Accuracy)
+            if (Math.Abs(zCoordinateSurfaceLine - bottomLevel) < toleranceAlmostEqual
+                && Math.Abs(nextSurfaceLineZCoordinate - bottomLevel) < toleranceAlmostEqual)
             {
                 enclosedAreas.Add(currentArea);
                 currentArea = new EnclosedArea();