Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators.Tests/KernelWrappers/MacroStabilityInwards/MacroStabilityInwardsKernelWrapperTests.cs
===================================================================
diff -u -r3307 -r3323
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators.Tests/KernelWrappers/MacroStabilityInwards/MacroStabilityInwardsKernelWrapperTests.cs	(.../MacroStabilityInwardsKernelWrapperTests.cs)	(revision 3307)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators.Tests/KernelWrappers/MacroStabilityInwards/MacroStabilityInwardsKernelWrapperTests.cs	(.../MacroStabilityInwardsKernelWrapperTests.cs)	(revision 3323)
@@ -29,6 +29,7 @@
 using Deltares.DamEngine.Data.Design;
 using Deltares.DamEngine.Data.General;
 using Deltares.DamEngine.Data.General.Results;
+using Deltares.DamEngine.Data.Geotechnics;
 using Deltares.DamEngine.Data.Standard.Calculation;
 using Deltares.DamEngine.Interface;
 using Deltares.DamEngine.Io;
@@ -333,16 +334,18 @@
             location.SurfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.DitchPolderSide).X = 62.5;
             location.SurfaceLine.Geometry.SyncCalcPoints();
 
+            SoilProfile1D soilProfile = DamEngineDataTestFactory.CreateSoilProfile1D(location.SoilList);
+            SetWaterpressureInterpolationModel(soilProfile.Layers);
+
             // This test is based on a 1D profile, to be combined with the surface line.
             var subSoilScenario = new SoilGeometryProbability();
             subSoilScenario.SoilProfileType = SoilProfileType.ProfileType1D;
             subSoilScenario.StiFileName = "";
             subSoilScenario.FullStiFileName = "";
             subSoilScenario.SoilProfile2D = null; 
             subSoilScenario.SegmentFailureMechanismType = SegmentFailureMechanismType.Stability;
+            subSoilScenario.SoilProfile1D = soilProfile;
 
-            subSoilScenario.SoilProfile1D = DamEngineDataTestFactory.CreateSoilProfile1D(location.SoilList);
-
             var damKernelInput = new DamKernelInput
             {
                 Location = location,
@@ -368,5 +371,12 @@
             return damKernelInput;
         }
 
+        private static void SetWaterpressureInterpolationModel(IEnumerable<SoilLayer1D> layers)
+        {
+            foreach (SoilLayer1D layer in layers)
+            {
+                layer.WaterpressureInterpolationModel = WaterpressureInterpolationModel.Hydrostatic;
+            }
+        }
     }
 }
Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/WaterpressureInterpolationModel.cs
===================================================================
diff -u -r3180 -r3323
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/WaterpressureInterpolationModel.cs	(.../WaterpressureInterpolationModel.cs)	(revision 3180)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/WaterpressureInterpolationModel.cs	(.../WaterpressureInterpolationModel.cs)	(revision 3323)
@@ -30,12 +30,12 @@
         /// <summary>
         /// Automatic interpolation
         /// </summary>
-        Automatic=0,
+        Automatic=1,
 
         /// <summary>
         /// Hydrostatic interpolation
         /// </summary>
-        Hydrostatic=1
+        Hydrostatic=2
        
     }
 }
Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilSurfaceProfile.cs
===================================================================
diff -u -r3271 -r3323
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilSurfaceProfile.cs	(.../SoilSurfaceProfile.cs)	(revision 3271)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilSurfaceProfile.cs	(.../SoilSurfaceProfile.cs)	(revision 3323)
@@ -244,7 +244,10 @@
             double maxZCoordinateLayers = soilLayers.Select(l => l.TopLevel).Max();
             if (maxZCoordinateLayers < maxZCoordinateSurfaceLine)
             {
-                soilLayers.Insert(0, new SoilLayer1D(DikeEmbankmentMaterial, maxZCoordinateSurfaceLine));
+                soilLayers.Insert(0, new SoilLayer1D(DikeEmbankmentMaterial, maxZCoordinateSurfaceLine)
+                {
+                    WaterpressureInterpolationModel = WaterpressureInterpolationModel.Hydrostatic
+                });
             }
 
             copiedSoilProfile.EnsureLastLayerHasHeight();
Index: DamEngine/trunk/src/Deltares.DamEngine.Data.Tests/Geotechnics/SoilSurfaceProfileTests.cs
===================================================================
diff -u -r3266 -r3323
--- DamEngine/trunk/src/Deltares.DamEngine.Data.Tests/Geotechnics/SoilSurfaceProfileTests.cs	(.../SoilSurfaceProfileTests.cs)	(revision 3266)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data.Tests/Geotechnics/SoilSurfaceProfileTests.cs	(.../SoilSurfaceProfileTests.cs)	(revision 3323)
@@ -743,7 +743,7 @@
             SoilLayer2D actualSoilLayer)
         {
             Assert.That(actualSoilLayer.IsAquifer, Is.False);
-            Assert.That(actualSoilLayer.WaterpressureInterpolationModel, Is.EqualTo(default(WaterpressureInterpolationModel)));
+            Assert.That(actualSoilLayer.WaterpressureInterpolationModel, Is.EqualTo(WaterpressureInterpolationModel.Hydrostatic));
             Assert.That(actualSoilLayer.Soil, Is.SameAs(expectedProfile.DikeEmbankmentMaterial));
         }