Index: DamEngine/trunk/src/Deltares.DamEngine.Data.Tests/Geotechnics/SoilProfile2DSurfaceLineHelperTests.cs
===================================================================
diff -u -r5696 -r5755
--- DamEngine/trunk/src/Deltares.DamEngine.Data.Tests/Geotechnics/SoilProfile2DSurfaceLineHelperTests.cs	(.../SoilProfile2DSurfaceLineHelperTests.cs)	(revision 5696)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data.Tests/Geotechnics/SoilProfile2DSurfaceLineHelperTests.cs	(.../SoilProfile2DSurfaceLineHelperTests.cs)	(revision 5755)
@@ -103,6 +103,7 @@
                 {
                     TestNumber = 1,
                     GivenZigZagSurfaceLine = FactoryForSurfaceLines.CreateSurfaceLineInZigZag(-50, 10),
+                    GivenShift = 0,
                     ExpectedSurfaceCount = 10, 
                     // 4 extra surfaces created : 2 below the highest corners of the "zigzag" surface line + 2 on the left side (between Z=60 and 70)
                     ExpectedFilling1 = FactoryForSoilProfiles.CreateQuadrilateralSoilLayer2D(new Point2D(-50, 10), new Point2D(-30, 12), new Point2D(-10, 10), new Point2D(-20, 10), soilFilling),
@@ -125,6 +126,7 @@
                 {
                     TestNumber = 2,
                     GivenZigZagSurfaceLine = FactoryForSurfaceLines.CreateSurfaceLineInZigZag(-50, 13),
+                    GivenShift = 0,
                     ExpectedSurfaceCount = 9, 
                     // 3 extra surfaces created: 1 below the "zigzag" surface line + 2 on the left side (between Z=60 and 70)
                     ExpectedFilling1 = FactoryForSoilProfiles.CreatePolygoneSoilLayer2D([
@@ -160,6 +162,7 @@
                 {
                     TestNumber = 3,
                     GivenZigZagSurfaceLine = FactoryForSurfaceLines.CreateSurfaceLineInZigZag(-50, 5),
+                    GivenShift = 0,
                     ExpectedSurfaceCount = 8, 
                     // 2 extra surfaces created on the left side (between Z=60 and 70)
                     ExpectedFilling1 = null,
@@ -181,6 +184,7 @@
                 {
                     TestNumber = 4,
                     GivenZigZagSurfaceLine = FactoryForSurfaceLines.CreateSurfaceLineInZigZag(-50, 0),
+                    GivenShift = 0,
                     ExpectedSurfaceCount = 8,
                     // 2 extra surfaces created on the left side (between Z=60 and 70)
                     ExpectedFilling1 = null,
@@ -202,6 +206,7 @@
                 {
                     TestNumber = 5,
                     GivenZigZagSurfaceLine = FactoryForSurfaceLines.CreateSurfaceLineInZigZag(-40, 10),
+                    GivenShift = 0,
                     ExpectedSurfaceCount = 10,
                     // Only few surfaces are tested
                     ExpectedFilling1 = FactoryForSoilProfiles.CreateQuadrilateralSoilLayer2D(new Point2D(-40, 10), new Point2D(-20, 12), new Point2D(0, 10), new Point2D(-20, 10), soilFilling),
@@ -223,6 +228,7 @@
                 {
                     TestNumber = 6,
                     GivenZigZagSurfaceLine = FactoryForSurfaceLines.CreateSurfaceLineInZigZag(10, 10),
+                    GivenShift = 0,
                     ExpectedSurfaceCount = 7,
                     // Only few surfaces are tested
                     ExpectedFilling1 = FactoryForSoilProfiles.CreateTriangularSoilLayer2D(new Point2D(10, 10), new Point2D(30, 12), new Point2D(50, 10), soilFilling),
@@ -244,6 +250,7 @@
                 {
                     TestNumber = 7,
                     GivenZigZagSurfaceLine = FactoryForSurfaceLines.CreateSurfaceLineInZigZag(-60, 10),
+                    GivenShift = 0,
                     ExpectedSurfaceCount = 10,
                     // Only few surfaces are tested
                     ExpectedFilling1 = FactoryForSoilProfiles.CreateQuadrilateralSoilLayer2D(new Point2D(-60, 10), new Point2D(-40, 12), new Point2D(-20, 10), new Point2D(-50, 10), soilFilling),
@@ -265,6 +272,7 @@
                 {
                     TestNumber = 8,
                     GivenZigZagSurfaceLine = FactoryForSurfaceLines.CreateSurfaceLineInZigZag(-110, 10),
+                    GivenShift = 0,
                     ExpectedSurfaceCount = 9,
                     // Only few surfaces are tested
                     ExpectedFilling1 = FactoryForSoilProfiles.CreateTriangularSoilLayer2D(new Point2D(-110, 10), new Point2D(-90, 12), new Point2D(-70, 10), soilFilling),
@@ -286,6 +294,7 @@
                 {
                     TestNumber = 9,
                     GivenZigZagSurfaceLine = FactoryForSurfaceLines.CreateSurfaceLineInZigZag(50, -5),
+                    GivenShift = 0,
                     ExpectedSurfaceCount = 2,
                     ExpectedFilling1 = null,
                     ExpectedFilling2 = null,
@@ -300,6 +309,31 @@
                     ExpectedSurface5 = null, 
                     ExpectedSurface6 = FactoryForSoilProfiles.CreateQuadrilateralSoilLayer2D(new Point2D(50, -5), new Point2D(60, -4), new Point2D(60, -15), new Point2D(50, -15), soil6)
                 }).SetName("Test 9: Surface line starts inside surface line 6 (right bottom) of soil profile");
+            
+            yield return new TestCaseData(
+                new TestCaseZigZagSurfaceLine
+                {
+                    TestNumber = 10,
+                    GivenZigZagSurfaceLine = FactoryForSurfaceLines.CreateSurfaceLineInZigZag(-40, 10),
+                    GivenShift = 10,
+                    ExpectedSurfaceCount = 10, 
+                    // 4 extra surfaces created : 2 below the highest corners of the "zigzag" surface line + 2 on the left side (between Z=70 and 80)
+                    ExpectedFilling1 = FactoryForSoilProfiles.CreateQuadrilateralSoilLayer2D(new Point2D(-40, 10), new Point2D(-20, 12), new Point2D(0, 10), new Point2D(-10, 10), soilFilling),
+                    ExpectedFilling2 = FactoryForSoilProfiles.CreateQuadrilateralSoilLayer2D(new Point2D(40, 10), new Point2D(60, 12), new Point2D(80, 10), new Point2D(70, 10), soilFilling),
+                    ExpectedExtendedSurface1 = null,
+                    ExpectedExtendedSurface3 = FactoryForSoilProfiles.CreateRectangularSoilLayer2D(10, 0, 70, 80, soil3),
+                    ExpectedExtendedSurface4 = null,
+                    ExpectedExtendedSurface6 = FactoryForSoilProfiles.CreateRectangularSoilLayer2D(0, -15, 70, 80, soil6),
+                    ExpectedSurface1 = FactoryForSoilProfiles.CreateRectangularSoilLayer2D(10, 0, -40, -10, soil1),
+                    ExpectedSurface2 = FactoryForSoilProfiles.CreateHexagonSoilLayer2D(new Point2D(-10, 10), new Point2D(0, 10), new Point2D(10, 9), new Point2D(10, 0),new Point2D(0, 0), new Point2D(-10, 0), soil2),
+                    ExpectedSurface3 = FactoryForSoilProfiles.CreateHeptagonSoilLayer2D(new Point2D(10, 9), new Point2D(20, 8), new Point2D(40, 10), new Point2D(70, 10), new Point2D(70, 0), new Point2D(45, 0), new Point2D(10, 0), soil3),
+                    ExpectedSurface4 = FactoryForSoilProfiles.CreatePentagonSoilLayer2D(new Point2D(-40, 0), new Point2D(-10, 0), new Point2D(0, 0), new Point2D(0, -15), new Point2D(-40, -15), soil4),
+                    ExpectedSurface5 = FactoryForSoilProfiles.CreatePentagonSoilLayer2D(new Point2D(0, 0), new Point2D(10, 0), new Point2D(45, 0), new Point2D(45, -15), new Point2D(0, -15), soil5),
+                    ExpectedSurface6 = FactoryForSoilProfiles.CreateRectangularSoilLayer2D(0, -15, 45, 70, soil6)
+                    
+                }).SetName("Test 10: Surface line is shifted by +10 m compared to the original surface line and the geometry " +
+                           "is shifted with 10 m. So the expected soil profile should be identical to test case 1 " +
+                           "but should start at -40 instead of -50.");
         }
     }
 
@@ -344,7 +378,7 @@
         };
         // When
         SoilProfile2D newSoilProfile2D = SoilProfile2DSurfaceLineHelper.CombineSurfaceLineWithSoilProfile2D(
-            testCaseSurfaceLine.GivenZigZagSurfaceLine.Geometry, soilProfile2D, defaultSoil, 0);
+            testCaseSurfaceLine.GivenZigZagSurfaceLine.Geometry, soilProfile2D, defaultSoil, testCaseSurfaceLine.GivenShift);
         
         // Then
         if (testCaseSurfaceLine.ExpectedSurfaceCount == 0)
@@ -372,6 +406,7 @@
         // New surface line is checked only for test case 6
         if (testCaseSurfaceLine.TestNumber == 6)
         {
+            Assert.That(newSoilProfile2D, Is.Not.Null);
             Assert.That(newSoilProfile2D.Geometry.SurfaceLine.Points, Has.Count.EqualTo(8));
             Assert.Multiple(() =>
             {
@@ -412,9 +447,8 @@
     /// </summary>
     public class TestCaseSurfaceLine
     {
-        public SurfaceLine2 SurfaceLine { get; set; }
-        public int SurfaceCount { get; set; }
-        
+        public SurfaceLine2 SurfaceLine { get; init; }
+        public int SurfaceCount { get; init; }
         public int TestNumber { get; set; }
     }
     
@@ -424,6 +458,7 @@
     public class TestCaseZigZagSurfaceLine
     {
         public SurfaceLine2 GivenZigZagSurfaceLine { get; init; }
+        public double GivenShift { get; init; }
         public int ExpectedSurfaceCount { get; init; }
         public SoilLayer2D ExpectedSurface1 { get; init; }
         public SoilLayer2D ExpectedSurface2 { get; init; }