Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/DesignCalculator.cs
===================================================================
diff -u -r1366 -r1368
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/DesignCalculator.cs	(.../DesignCalculator.cs)	(revision 1366)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/DesignCalculator.cs	(.../DesignCalculator.cs)	(revision 1368)
@@ -159,10 +159,17 @@
             {
                 if (damKernelInput.Location.RedesignDikeHeight)
                 {
-                    // Redesign the surfaceline to the desired Dike Tabel Height
-                    var surfaceLineHeightAdapter = new SurfaceLineHeightAdapter(location.SurfaceLine, location);
-                    SurfaceLine2 adaptedSurfaceLine = surfaceLineHeightAdapter.ConstructNewSurfaceLine(designScenario.DikeTableHeight ?? location.SurfaceLine.GetDefaultDikeTableHeight() ?? 0);
-                    location.SurfaceLine = adaptedSurfaceLine;
+                    double? dikeHeight = location.SurfaceLine.GetDikeHeight();
+                    if (dikeHeight.HasValue)
+                    {
+                        if (designScenario.DikeTableHeight > dikeHeight.Value)
+                        {
+                            // Redesign the surfaceline to the desired Dike Tabel Height
+                            var surfaceLineHeightAdapter = new SurfaceLineHeightAdapter(location.SurfaceLine, location);
+                            SurfaceLine2 adaptedSurfaceLine = surfaceLineHeightAdapter.ConstructNewSurfaceLine(designScenario.DikeTableHeight ?? location.SurfaceLine.GetDefaultDikeTableHeight() ?? 0);
+                            location.SurfaceLine = adaptedSurfaceLine;
+                        }
+                    }
                 }
                 if (damKernelInput.Location.RedesignDikeShoulder)
                 {