Index: Ringtoets/Piping/src/Ringtoets.Piping.Forms/Views/PipingFailureMechanismView.cs
===================================================================
diff -u -r1d7f9c7875b22fe69fd5b1a32b2bc817dd6cf192 -r8d3579e3b7a7c43620023abba50a7f33bf480185
--- Ringtoets/Piping/src/Ringtoets.Piping.Forms/Views/PipingFailureMechanismView.cs	(.../PipingFailureMechanismView.cs)	(revision 1d7f9c7875b22fe69fd5b1a32b2bc817dd6cf192)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Forms/Views/PipingFailureMechanismView.cs	(.../PipingFailureMechanismView.cs)	(revision 8d3579e3b7a7c43620023abba50a7f33bf480185)
@@ -32,6 +32,7 @@
 using Ringtoets.Common.Forms.Views;
 using Ringtoets.Piping.Data;
 using Ringtoets.Piping.Forms.PresentationObjects;
+using Ringtoets.Piping.Primitives;
 using PipingDataResources = Ringtoets.Piping.Data.Properties.Resources;
 
 namespace Ringtoets.Piping.Forms.Views
@@ -50,6 +51,7 @@
         private readonly RecursiveObserver<CalculationGroup, PipingInput> calculationInputObserver;
         private readonly RecursiveObserver<CalculationGroup, CalculationGroup> calculationGroupObserver;
         private readonly RecursiveObserver<CalculationGroup, PipingCalculationScenario> calculationObserver;
+        private readonly RecursiveObserver<RingtoetsPipingSurfaceLineCollection, RingtoetsPipingSurfaceLine> surfaceLineObserver;
 
         private readonly MapDataCollection mapDataCollection;
         private readonly MapLineData referenceLineMapData;
@@ -89,6 +91,8 @@
             calculationGroupObserver = new RecursiveObserver<CalculationGroup, CalculationGroup>(UpdateMapData, pcg => pcg.Children);
             calculationObserver = new RecursiveObserver<CalculationGroup, PipingCalculationScenario>(UpdateMapData, pcg => pcg.Children);
 
+            surfaceLineObserver = new RecursiveObserver<RingtoetsPipingSurfaceLineCollection, RingtoetsPipingSurfaceLine>(UpdateMapData, rpslc => rpslc);
+
             mapDataCollection = new MapDataCollection(PipingDataResources.PipingFailureMechanism_DisplayName);
             referenceLineMapData = RingtoetsMapDataFactory.CreateReferenceLineMapData();
             hydraulicBoundaryLocationsMapData = RingtoetsMapDataFactory.CreateHydraulicBoundaryLocationsMapData();
@@ -129,6 +133,7 @@
                     calculationInputObserver.Observable = null;
                     calculationGroupObserver.Observable = null;
                     calculationObserver.Observable = null;
+                    surfaceLineObserver.Observable = null;
 
                     mapControl.RemoveAllData();
                 }
@@ -142,6 +147,7 @@
                     calculationInputObserver.Observable = data.WrappedData.CalculationsGroup;
                     calculationGroupObserver.Observable = data.WrappedData.CalculationsGroup;
                     calculationObserver.Observable = data.WrappedData.CalculationsGroup;
+                    surfaceLineObserver.Observable = data.WrappedData.SurfaceLines;
 
                     SetMapDataFeatures();