Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometrySurface.cs
===================================================================
diff -u -r6559 -r6560
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometrySurface.cs	(.../GeometrySurface.cs)	(revision 6559)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometrySurface.cs	(.../GeometrySurface.cs)	(revision 6560)
@@ -175,11 +175,13 @@
     /// <returns>The point or null when no valid point is found.</returns>
     public Point2D DetermineValidTestPointBasedOnNewSurface()
     {
-        double offset = 0.002;
+        const double initialOffset = 0.002;
+        const double stopCriteriumOffset = 1e-8;
+        double offset = initialOffset;
         Point2D point = null;
         var geometryPointString = DetermineTopGeometrySurface();
         geometryPointString.SortPointsByXAscending();
-        while (point == null && offset > 1e-8)
+        while (point == null && offset > stopCriteriumOffset)
         {
             // Just keep looking by halving the offset until found.
             point = FindValidTestPoint(geometryPointString, offset);
@@ -214,8 +216,8 @@
             }
             if (i == geometryPointString.Count - 2)
             {
-                // if no valid point is found, then the shape is very awkward or the surface is terribly small.
-                // In that case, return null.
+                // if no valid point is yet found, then the shape is very awkward or the surface is terribly small.
+                // In that case, return null so the routine can try again with a smaller offset.
                 point = null;
             }
         }