Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilLayer2D.cs
===================================================================
diff -u -r5294 -r6087
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilLayer2D.cs	(.../SoilLayer2D.cs)	(revision 5294)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilLayer2D.cs	(.../SoilLayer2D.cs)	(revision 6087)
@@ -57,7 +57,7 @@
     /// Creates a clone of the SoilLayer2D
     /// </summary>
     /// <returns>The cloned SoilLayer2D</returns>
-    public SoilLayer2D Clone()
+    public SoilLayer2D Clone(GeometryData geometryData)
     {
         var clonedSoilLayer2D = new SoilLayer2D
         {
@@ -67,10 +67,14 @@
             WaterpressureInterpolationModel = WaterpressureInterpolationModel,
             GeometrySurface = GeometrySurface.Clone()
         };
-        var clonedLoop = GeometrySurface.OuterLoop.Clone();
+        GeometryLoop clonedLoop = geometryData.FindLoopThatHasSameLoopCurves(GeometrySurface.OuterLoop);
         clonedSoilLayer2D.GeometrySurface.OuterLoop = clonedLoop;
         List<GeometryLoop> innerLoops = new List<GeometryLoop>();
-        innerLoops.AddRange(GeometrySurface.InnerLoops.Select(loop => loop.Clone()).ToList());
+        foreach (GeometryLoop innerLoop in GeometrySurface.InnerLoops)
+        {
+            innerLoops.Add(geometryData.FindLoopThatHasSameLoopCurves(innerLoop));    
+        }
+        
         clonedSoilLayer2D.GeometrySurface.InnerLoops.AddRange(innerLoops);
         return clonedSoilLayer2D;
     }