Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/MacroStabilityInwards/MacroStabilityInwardsKernelWrapper.cs
===================================================================
diff -u -r3029 -r3030
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/MacroStabilityInwards/MacroStabilityInwardsKernelWrapper.cs	(.../MacroStabilityInwardsKernelWrapper.cs)	(revision 3029)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/MacroStabilityInwards/MacroStabilityInwardsKernelWrapper.cs	(.../MacroStabilityInwardsKernelWrapper.cs)	(revision 3030)
@@ -152,6 +152,13 @@
                 upliftVanCalculationGrid.RightGridZCount = 3;
                 upliftVanCalculationGrid.RightGridZTop = surfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.DikeTopAtPolder).Z + 2;
                 upliftVanCalculationGrid.RightGridZBottom = surfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.SurfaceLevelInside).Z + 2;
+
+                upliftVanCalculationGrid.TangentLineAutomaticAtBoundaries = false;
+                upliftVanCalculationGrid.TangentLineCount = 5;
+                upliftVanCalculationGrid.TangentLineZTop =
+                    surfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.SurfaceLevelInside).Z - 1;
+                upliftVanCalculationGrid.TangentLineZBottom =
+                    surfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.SurfaceLevelInside).Z - 6;
             }
 
             return upliftVanCalculationGrid;