Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/Dike.cs
===================================================================
diff -u -r5954 -r6220
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/Dike.cs	(.../Dike.cs)	(revision 5954)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/Dike.cs	(.../Dike.cs)	(revision 6220)
@@ -65,13 +65,6 @@
 
         locations = new List<Location>();
         soilProfiles = new List<SoilProfile1D>();
-
-#pragma warning disable CS0618 // Type or member is obsolete
-        surfaceLines = new DelegatedList<SurfaceLine>
-#pragma warning restore CS0618 // Type or member is obsolete
-        {
-            AddMethod = ConvertAddedOldSurfaceLineToNewFormat
-        };
         SurfaceLines2 = new List<SurfaceLine2>();
         pl1Lines = new List<PL1Line>();
         soilList = new SoilList();
@@ -646,48 +639,4 @@
         Locations = newLocations;
         return logMessages;
     }
-
-    #region Backwards compatibility
-
-#pragma warning disable CS0618 // Type or member is obsolete
-    private IList<SurfaceLine> surfaceLines;
-#pragma warning restore CS0618 // Type or member is obsolete
-
-    /// <summary>
-    ///     Gets or sets all surface lines instances associated with this dike.
-    /// </summary>
-    /// <remarks>
-    ///     Composite owner of all <see cref="SurfaceLine" /> that are part of the
-    ///     application that are associated with this dike.
-    /// </remarks>
-    [Obsolete("Do not use this member; Only exists for backwards compatibility.", true)]
-    public virtual IList<SurfaceLine> SurfaceLines
-    {
-        get => surfaceLines;
-        set => surfaceLines = value;
-    }
-
-    /// <summary>
-    ///     Performs backwards compatibility conversion from old-style surfaceline to new-style
-    ///     surfaceline, and ensures that shared references are set correctly.
-    /// </summary>
-    /// <param name="argument">Persisted version of the old-style surfaceline.</param>
-#pragma warning disable CS0618 // Type or member is obsolete
-    private void ConvertAddedOldSurfaceLineToNewFormat(SurfaceLine argument)
-#pragma warning restore CS0618 // Type or member is obsolete
-    {
-        SurfaceLine2 surfaceLine2 = new OldSurfaceLineToNewConverter().Convert(argument);
-        SurfaceLines2.Add(surfaceLine2);
-
-        foreach (Location location in Locations)
-        {
-            location.SetNewSurfaceLineIfMatchesWithOldPersistedSurfaceLine(surfaceLine2);
-        }
-
-        // Remove old entry; it is no longer required.
-        surfaceLines.Remove(argument);
-        argument.Dispose();
-    }
-
-    #endregion
 }
\ No newline at end of file