Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/MacroStabilityCommon/UpliftVanCalculationGrid.cs
===================================================================
diff -u -r3042 -r3046
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/MacroStabilityCommon/UpliftVanCalculationGrid.cs	(.../UpliftVanCalculationGrid.cs)	(revision 3042)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/MacroStabilityCommon/UpliftVanCalculationGrid.cs	(.../UpliftVanCalculationGrid.cs)	(revision 3046)
@@ -19,6 +19,8 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System.Collections.Generic;
+
 namespace Deltares.DamEngine.Calculators.KernelWrappers.MacroStabilityCommon
 {
     /// <summary>Parameters for the UpliftVan Macrostability kernel; used for IO</summary>
@@ -63,17 +65,22 @@
         /// <summary>Gets or sets the right grid z count.</summary>
         /// <value>The right grid z count.</value>
         public int RightGridZCount { get; set; }
+
         /// <summary>Gets or sets the tangent line z top.</summary>
         /// <value>The tangent line z top.</value>
+        /// <summary>Gets or sets the tangent line creation automatic or specified.</summary>
+        /// <value>The tangent line creation setting .</value>
+        public bool IsTangentLinesAutomatic { get; set; }
         public double TangentLineZTop { get; set; }
         /// <summary>Gets or sets the tangent line z bottom.</summary>
         /// <value>The tangent line z bottom.</value>
         public double TangentLineZBottom { get; set; }
         /// <summary>Gets or sets the tangent line count.</summary>
         /// <value>The tangent line count.</value>
         public int TangentLineCount { get; set; }
-        /// <summary>Gets or sets the tangent line setting automatic at boundaries.</summary>
-        /// <value>The tangent line setting automatic at boundaries.</value>
-        public bool IsTangentLinesAutomatic { get; set; }
+
+        /// <summary>Gets or sets the tangent line levels.</summary>
+        /// <value>The tangent line levels.</value>
+        public List<double>TangentLineLevels { get; set; } = new List<double>();
     }
 }
Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/MacroStabilityInwards/UpliftVanGridCreator.cs
===================================================================
diff -u -r3042 -r3046
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/MacroStabilityInwards/UpliftVanGridCreator.cs	(.../UpliftVanGridCreator.cs)	(revision 3042)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/MacroStabilityInwards/UpliftVanGridCreator.cs	(.../UpliftVanGridCreator.cs)	(revision 3046)
@@ -106,31 +106,40 @@
                     DetermineTangentLinesOnBoundaryLines(upliftVanCalculationGrid, slipCircleDefinition, soilProfile1D, minimumCircleDepth);
                     break;
                 case TangentLinesDefinition.Specified:
-                    DetermineTangentLinesSpecified(upliftVanCalculationGrid, slipCircleDefinition, soilProfile1D, minimumCircleDepth);
+                    DetermineTangentLinesSpecified(upliftVanCalculationGrid, soilProfile1D, 
+                        slipCircleDefinition.UpliftVanTangentLinesDistance, minimumCircleDepth);
                     break;
             }
 
         }
 
         private static void DetermineTangentLinesOnBoundaryLines(UpliftVanCalculationGrid upliftVanCalculationGrid, 
-            SlipCircleDefinition slipCircleDefinition, SoilProfile1D soilProfile1D, double minimumCircleDepth)
+            SoilProfile1D soilProfile1D)
         {
             upliftVanCalculationGrid.IsTangentLinesAutomatic = false;
-            throw new NotImplementedException();
+            upliftVanCalculationGrid.TangentLineLevels.Clear();
+            for (int i = 0; i < soilProfile1D.LayerCount; i++)
+            {
+                upliftVanCalculationGrid.TangentLineLevels.Add(soilProfile1D.Layers[i].TopLevel);
+            }
         }
 
         private static void DetermineTangentLinesSpecified(UpliftVanCalculationGrid upliftVanCalculationGrid,
-            SlipCircleDefinition slipCircleDefinition, SoilProfile1D soilProfile1D, double minimumCircleDepth)
+            SoilProfile1D soilProfile1D, double distance,  double minimumCircleDepth)
         {
+            if (!(distance > 0))
+            {
+                throw new ArgumentException(String.Format("Vertical distance should be > 0 but is {0}", distance));
+            }
             double topOfBottomLayer = soilProfile1D.Layers.Last().TopLevel;
             double surfaceLevel = soilProfile1D.Layers.First().TopLevel;
-            double bottomTangentLines = topOfBottomLayer - slipCircleDefinition.UpliftVanTangentLinesDistance;
+            double bottomTangentLines = topOfBottomLayer - distance;
             bottomTangentLines = Math.Min(bottomTangentLines, surfaceLevel - minimumCircleDepth);
             double topTangentLines = bottomTangentLines;
             int tangentLinesCount = 1;
             while (topTangentLines < surfaceLevel)
             {
-                topTangentLines += slipCircleDefinition.UpliftVanTangentLinesDistance;
+                topTangentLines += distance;
                 tangentLinesCount++;
             }