Index: DamEngine/trunk/src/Deltares.DamEngine.Data.Tests/Geotechnics/SoilProfile2DSurfaceLineHelperTests.cs
===================================================================
diff -u -r7042 -r7049
--- DamEngine/trunk/src/Deltares.DamEngine.Data.Tests/Geotechnics/SoilProfile2DSurfaceLineHelperTests.cs	(.../SoilProfile2DSurfaceLineHelperTests.cs)	(revision 7042)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data.Tests/Geotechnics/SoilProfile2DSurfaceLineHelperTests.cs	(.../SoilProfile2DSurfaceLineHelperTests.cs)	(revision 7049)
@@ -459,7 +459,7 @@
 
     [Test]
     [TestCase(35.002, 7)]
-    [TestCase(35.001,7)]
+    [TestCase(35.001, 7)]
     [TestCase(35.000, 6)]
     [TestCase(34.999, 6)]
     [TestCase(34.998, 6)]
@@ -479,27 +479,43 @@
         // Then
         Assert.That(newSoilProfile2D, Is.Not.Null);
         Assert.That(newSoilProfile2D.Surfaces, Has.Count.EqualTo(expectedLayerCount));
-        if (expectedLayerCount == 6)
+
+        var soil1 = new Soil("Soil1");
+        var soil2 = new Soil("Soil2");
+        var soil3 = new Soil("Soil3");
+        var soil4 = new Soil("Soil4");
+        var soil5 = new Soil("Soil5");
+        SoilLayer2D expectedSurface1 = FactoryForSoilProfiles.CreateRectangularSoilLayer2D(10, 0, -50, -20, newSoilProfile2D, soil1);
+        SoilLayer2D expectedSurface2 = FactoryForSoilProfiles.CreatePentagonSoilLayer2D(new Point2D(-20, 10), new Point2D(0, 10), new Point2D(0, 0), new Point2D(-10, 0), new Point2D(-20, 0), newSoilProfile2D, soil2);
+        SoilLayer2D expectedSurface3 = expectedLayerCount switch
         {
-            var soil1 = new Soil("Soil1");
-            var soil2 = new Soil("Soil2");
-            var soil3 = new Soil("Soil3");
-            var soil4 = new Soil("Soil4");
-            var soil5 = new Soil("Soil5");
-            SoilLayer2D expectedSurface1 = FactoryForSoilProfiles.CreateRectangularSoilLayer2D(10, 0, -50, -20, newSoilProfile2D, soil1);
-            SoilLayer2D expectedSurface2 = FactoryForSoilProfiles.CreatePentagonSoilLayer2D(new Point2D(-20, 10), new Point2D(0, 10), new Point2D(0, 0), new Point2D(-10, 0), new Point2D(-20, 0), newSoilProfile2D, soil2);
-            SoilLayer2D expectedSurface3 = FactoryForSoilProfiles.CreateRectangularSoilLayer2D(10, 0, 0, xEndSurfaceLine, newSoilProfile2D, soil3);
-            SoilLayer2D expectedSurface4 = FactoryForSoilProfiles.CreatePentagonSoilLayer2D(new Point2D(-50, 0), new Point2D(-20, 0), new Point2D(-10, 0), new Point2D(-10, -15), new Point2D(-50, -15), newSoilProfile2D, soil4);
-            SoilLayer2D expectedSurface5 = FactoryForSoilProfiles.CreatePentagonSoilLayer2D(new Point2D(-10, 0), new Point2D(0, 0), new Point2D(xEndSurfaceLine, 0), new Point2D(xEndSurfaceLine, -15), new Point2D(-10, -15), newSoilProfile2D, soil5);
-            SoilLayer2D expectedSurfaceFilling = FactoryForSoilProfiles.CreatePolygoneSoilLayer2D([
-                new Point2D(-50, 11), surfaceLine.CharacteristicPoints[1].Point, surfaceLine.CharacteristicPoints[2].Point, surfaceLine.CharacteristicPoints[3].Point, new Point2D(xEndSurfaceLine, 11), new Point2D(xEndSurfaceLine, 10), new Point2D(0, 10), new Point2D(-20, 10), new Point2D(-50, 10)
-            ], defaultSoil, newSoilProfile2D);
-            CheckSoilProfileContainsSoilLayer(newSoilProfile2D, expectedSurface1);
-            CheckSoilProfileContainsSoilLayer(newSoilProfile2D, expectedSurface2);
-            CheckSoilProfileContainsSoilLayer(newSoilProfile2D, expectedSurface3);
-            CheckSoilProfileContainsSoilLayer(newSoilProfile2D, expectedSurface4);
-            CheckSoilProfileContainsSoilLayer(newSoilProfile2D, expectedSurface5);
-            CheckSoilProfileContainsSoilLayer(newSoilProfile2D, expectedSurfaceFilling);
+            6 => FactoryForSoilProfiles.CreateRectangularSoilLayer2D(10, 0, 0, xEndSurfaceLine, newSoilProfile2D, soil3),
+            7 => FactoryForSoilProfiles.CreatePentagonSoilLayer2D(new Point2D(0, 0), new Point2D(0, 10), new Point2D(xEndSurfaceLine, 10), new Point2D(xEndSurfaceLine, 0), new Point2D(35, 0), newSoilProfile2D, soil3),
+            _ => null
+        };
+
+        SoilLayer2D expectedSurface4 = FactoryForSoilProfiles.CreatePentagonSoilLayer2D(new Point2D(-50, 0), new Point2D(-20, 0), new Point2D(-10, 0), new Point2D(-10, -15), new Point2D(-50, -15), newSoilProfile2D, soil4);
+        SoilLayer2D expectedSurface5 = expectedLayerCount switch
+        {
+            6 => FactoryForSoilProfiles.CreatePentagonSoilLayer2D(new Point2D(-10, 0), new Point2D(0, 0), new Point2D(xEndSurfaceLine, 0), new Point2D(xEndSurfaceLine, -15), new Point2D(-10, -15), newSoilProfile2D, soil5),
+            7 => FactoryForSoilProfiles.CreatePentagonSoilLayer2D(new Point2D(-10, 0), new Point2D(0, 0), new Point2D(35, 0), new Point2D(35, -15), new Point2D(-10, -15), newSoilProfile2D, soil5),
+            _ => null
+        };
+        SoilLayer2D expectedSurfaceFilling = FactoryForSoilProfiles.CreatePolygoneSoilLayer2D([
+            new Point2D(-50, 11), surfaceLine.CharacteristicPoints[1].Point, surfaceLine.CharacteristicPoints[2].Point, surfaceLine.CharacteristicPoints[3].Point, new Point2D(xEndSurfaceLine, 11), new Point2D(xEndSurfaceLine, 10), new Point2D(0, 10), new Point2D(-20, 10), new Point2D(-50, 10)
+        ], defaultSoil, newSoilProfile2D);
+        CheckSoilProfileContainsSoilLayer(newSoilProfile2D, expectedSurface1);
+        CheckSoilProfileContainsSoilLayer(newSoilProfile2D, expectedSurface2);
+        CheckSoilProfileContainsSoilLayer(newSoilProfile2D, expectedSurface3);
+        CheckSoilProfileContainsSoilLayer(newSoilProfile2D, expectedSurface4);
+        CheckSoilProfileContainsSoilLayer(newSoilProfile2D, expectedSurface5);
+        CheckSoilProfileContainsSoilLayer(newSoilProfile2D, expectedSurfaceFilling);
+
+        if (expectedLayerCount == 7)
+        {
+            var soil6 = new Soil("Soil6");
+            SoilLayer2D expectedSurface6 = FactoryForSoilProfiles.CreateRectangularSoilLayer2D(0, -15, 35, xEndSurfaceLine, newSoilProfile2D, soil6);
+            CheckSoilProfileContainsSoilLayer(newSoilProfile2D, expectedSurface6);
         }
     }
 
@@ -587,6 +603,10 @@
             X = xMin[0] + 2,
             Z = zMin[0] + 0.2
         };
+        if (!expectedSoilLayer.GeometrySurface.OuterLoop.IsPointInLoopArea(gravityPoint))
+        {
+            gravityPoint = Routines2D.ComputeCentroid(expectedSoilLayer.GeometrySurface.OuterLoop.Points);
+        }
 
         for (var i = 0; i < soilProfile2D.Surfaces.Count; i++)
         {
Index: DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/Factories/FactoryForSoilProfiles.cs
===================================================================
diff -u -r6917 -r7049
--- DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/Factories/FactoryForSoilProfiles.cs	(.../FactoryForSoilProfiles.cs)	(revision 6917)
+++ DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/Factories/FactoryForSoilProfiles.cs	(.../FactoryForSoilProfiles.cs)	(revision 7049)
@@ -545,8 +545,6 @@
     public static SoilProfile2D CreateSoilProfile2DWithTwoLayers()
     {
         const string layerName = "Layer";
-        const string topLayerName = "TopLayer";
-
         SoilLayer1D soilLayer = CreateSoilLayer(-5, layerName);
 
         var profile = new SoilProfile1D
Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometryPoint.cs
===================================================================
diff -u -r6404 -r7049
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometryPoint.cs	(.../GeometryPoint.cs)	(revision 6404)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometryPoint.cs	(.../GeometryPoint.cs)	(revision 7049)
@@ -35,7 +35,7 @@
     /// <summary>
     /// The precision
     /// </summary>
-    public const double Precision = GeometryConstants.Accuracy;
+    public const double Precision = GeometryConstants.Tolerance;
 
     /// <summary>
     /// Initializes a new instance of the <see cref="GeometryPoint"/> class.