Index: DamEngine/trunk/src/Deltares.DamEngine.Data/GeometryExport/PersistableGeometry.cs
===================================================================
diff -u -r5288 -r5352
--- DamEngine/trunk/src/Deltares.DamEngine.Data/GeometryExport/PersistableGeometry.cs	(.../PersistableGeometry.cs)	(revision 5288)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/GeometryExport/PersistableGeometry.cs	(.../PersistableGeometry.cs)	(revision 5352)
@@ -37,6 +37,7 @@
 public class PersistableSurface
 {
     public PersistableOuterLoop OuterLoop { get; set; }
+    public List<PersistableInnerLoop> InnerLoops { get; set; }
 }
 
 /// <summary>
@@ -48,6 +49,14 @@
 }
 
 /// <summary>
+/// Persistable Innerloop object (for json serialization)
+/// </summary>
+public class PersistableInnerLoop
+{
+    public List<PersistableCurve> Curves { get; set; }
+}
+
+/// <summary>
 /// Persistable Curve object (for json serialization)
 /// </summary>
 public class PersistableCurve
@@ -63,4 +72,21 @@
 {
     public double X { get; set; }
     public double Z { get; set; }
+}
+
+/// <summary>
+/// Persistable Surfaceline object (for json serialization)
+/// </summary>
+public class PersistableSurfaceLine
+{
+    public List<PersistablePoint> Points { get; set; }
+}
+
+/// <summary>
+/// Persistable Geometry with Surfaceline object (for json serialization)
+/// </summary>
+public class PersistableGeometryWithSurfaceLine
+{
+    public PersistableGeometry Geometry { get; set; }
+    public PersistableSurfaceLine SurfaceLine { get; set; }
 }
\ No newline at end of file
Index: DamEngine/trunk/src/Deltares.DamEngine.Data/GeometryExport/GeometryExporterHelper.cs
===================================================================
diff -u -r5288 -r5352
--- DamEngine/trunk/src/Deltares.DamEngine.Data/GeometryExport/GeometryExporterHelper.cs	(.../GeometryExporterHelper.cs)	(revision 5288)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/GeometryExport/GeometryExporterHelper.cs	(.../GeometryExporterHelper.cs)	(revision 5352)
@@ -65,4 +65,21 @@
 
         return persistableGeometry;
     }
+    
+    /// <summary>
+    /// Create a persistable geometry object from a GeometryData object
+    /// </summary>
+    /// <param name="geometry"></param>
+    /// <returns></returns>
+    public static PersistableSurfaceLine CreateFromGeometryPointString(GeometryPointString surfaceLine)
+    {
+        return new PersistableSurfaceLine
+        {
+            Points = surfaceLine.CalcPoints.Select(point => new PersistablePoint()
+            {
+                X = point.X,
+                Z = point.Z
+            }).ToList()
+        };
+    }
 }
\ No newline at end of file
Index: DamEngine/trunk/src/Deltares.DamEngine.Data/GeometryExport/GeometryExporter.cs
===================================================================
diff -u -r5288 -r5352
--- DamEngine/trunk/src/Deltares.DamEngine.Data/GeometryExport/GeometryExporter.cs	(.../GeometryExporter.cs)	(revision 5288)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/GeometryExport/GeometryExporter.cs	(.../GeometryExporter.cs)	(revision 5352)
@@ -48,6 +48,31 @@
     }
 
     /// <summary>
+    /// Export the geometry to a json file
+    /// </summary>
+    /// <param name="geometry"></param>
+    /// <param name="surfaceLine"></param>
+    /// <param name="fileName"></param>
+    public static void ExportWithSurfaceLineToJsonFile(GeometryData geometry, GeometryPointString surfaceLine, string fileName)
+    {
+        var jsonSerializerOptions = new JsonSerializerOptions
+        {
+            WriteIndented = true
+        };
+        PersistableGeometry persistableGeometry = GeometryExporterHelper.CreateFromGeometryData(geometry);
+        //string output = JsonSerializer.Serialize(persistableGeometry, jsonSerializerOptions);
+        PersistableSurfaceLine persistableSurfaceLine = GeometryExporterHelper.CreateFromGeometryPointString(surfaceLine);
+        PersistableGeometryWithSurfaceLine persistableGeometryWithSurfaceLine = new PersistableGeometryWithSurfaceLine
+        {
+            Geometry = persistableGeometry,
+            SurfaceLine = persistableSurfaceLine
+        };
+        string output = JsonSerializer.Serialize(persistableGeometryWithSurfaceLine, jsonSerializerOptions);
+        // Save output to text file
+        File.WriteAllText(fileName, output);
+    }
+    
+    /// <summary>
     /// Export the geometry to a text file
     /// </summary>
     /// <param name="geometry"></param>
@@ -104,4 +129,26 @@
             writer.WriteLine("[END SURFACES]");
         }
     }
+    
+    public static void ExportSurfacelineToFile(GeometryPointString surfaceLine, string fileName)
+    {
+        using (var writer = new StreamWriter(fileName))
+        {
+            // Export points
+            writer.WriteLine("[BEGIN POINTS] " + surfaceLine.Points.Count);
+            foreach (GeometryPoint point in surfaceLine.Points)
+            {
+                writer.WriteLine($"{point.X}, {point.Z}");
+            }
+            writer.WriteLine("[END POINTS]");
+            
+            // Export calc points
+            writer.WriteLine("[BEGIN CALC POINTS] " + surfaceLine.CalcPoints.Count);
+            foreach (Point2D calcPoint in surfaceLine.CalcPoints)
+            {
+                writer.WriteLine($"{calcPoint.X}, {calcPoint.Z}");
+            }
+            writer.WriteLine("[END CALC POINTS]");
+        }
+    }
 }
\ No newline at end of file