Index: Ringtoets/Piping/src/Ringtoets.Piping.Service/PipingInputSynchronizer.cs
===================================================================
diff -u -rc0a3ced404197fd781c6fcbcfc21c6676592be57 -r8b85f978c7bbe5c29a6ada6509f14d0462b8b9c3
--- Ringtoets/Piping/src/Ringtoets.Piping.Service/PipingInputSynchronizer.cs	(.../PipingInputSynchronizer.cs)	(revision c0a3ced404197fd781c6fcbcfc21c6676592be57)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Service/PipingInputSynchronizer.cs	(.../PipingInputSynchronizer.cs)	(revision 8b85f978c7bbe5c29a6ada6509f14d0462b8b9c3)
@@ -1,12 +1,17 @@
 using System;
 using Core.Common.Base;
 using Core.Common.Base.Data;
+using Core.Common.Base.Properties;
+using log4net;
 using Ringtoets.Piping.Data;
+using Resources = Ringtoets.Piping.Service.Properties.Resources;
 
 namespace Ringtoets.Piping.Service
 {
     public class PipingInputSynchronizer : IObserver
     {
+        private static readonly ILog log = LogManager.GetLogger(typeof(PipingInputSynchronizer));
+
         private const double seepageLengthStandardDeviationFraction = 0.1;
 
         private readonly PipingInput input;
@@ -52,23 +57,35 @@
             RingtoetsPipingSurfaceLine surfaceLine = input.SurfaceLine;
             double exitPointL = input.ExitPointL;
 
-            double thicknessTopAquiferLayer = GetThicknessTopAquiferLayer(soilProfile, surfaceLine, exitPointL);
-            TrySetThicknessAquiferLayerMean(input, thicknessTopAquiferLayer);
+            if (soilProfile != null && surfaceLine != null && !double.IsNaN(exitPointL))
+            {
+                double thicknessTopAquiferLayer = GetThicknessTopAquiferLayer(soilProfile, surfaceLine, exitPointL);
+                TrySetThicknessAquiferLayerMean(input, thicknessTopAquiferLayer);
+
+                if (double.IsNaN(input.ThicknessAquiferLayer.Mean))
+                {
+                    log.Warn(Resources.PipingInputSynchronizer_UpdateThicknessAquiferLayer_Cannot_determine_thickness_aquifer_layer);
+                }
+            }
+            else
+            {
+                input.ThicknessAquiferLayer.Mean = (RoundedDouble) double.NaN;
+            }
         }
 
-        private static double GetThicknessTopAquiferLayer(PipingSoilProfile soilProfile, RingtoetsPipingSurfaceLine surfaceLine, double exitPointL)
+        private static void TrySetThicknessAquiferLayerMean(PipingInput input, double thicknessTopAquiferLayer)
         {
-            var thicknessTopAquiferLayer = double.NaN;
-
-            if (soilProfile != null && surfaceLine != null && !double.IsNaN(exitPointL))
+            try
             {
-                thicknessTopAquiferLayer = TryGetThicknessTopAquiferLayer(soilProfile, surfaceLine, exitPointL);
+                input.ThicknessAquiferLayer.Mean = (RoundedDouble) thicknessTopAquiferLayer;
             }
-
-            return thicknessTopAquiferLayer;
+            catch (ArgumentOutOfRangeException)
+            {
+                input.ThicknessAquiferLayer.Mean = (RoundedDouble) double.NaN;
+            }
         }
 
-        private static double TryGetThicknessTopAquiferLayer(PipingSoilProfile soilProfile, RingtoetsPipingSurfaceLine surfaceLine, double exitPointL)
+        private static double GetThicknessTopAquiferLayer(PipingSoilProfile soilProfile, RingtoetsPipingSurfaceLine surfaceLine, double exitPointL)
         {
             try
             {
@@ -81,27 +98,32 @@
             }
         }
 
-        private static void TrySetThicknessAquiferLayerMean(PipingInput input, double thicknessTopAquiferLayer)
+        private void UpdateThicknessCoverageLayer()
         {
-            try
+            if (input.SurfaceLine != null && input.SoilProfile != null & !double.IsNaN(input.ExitPointL))
             {
-                input.ThicknessAquiferLayer.Mean = (RoundedDouble) thicknessTopAquiferLayer;
+                TrySetThicknessCoverageLayer();
+
+                if (double.IsNaN(input.ThicknessCoverageLayer.Mean))
+                {
+                    log.Warn(Resources.PipingInputSynchronizer_UpdateThicknessCoverageLayer_Cannot_determine_thickness_coverage_layer);
+                }
             }
-            catch (ArgumentOutOfRangeException)
+            else
             {
-                input.ThicknessAquiferLayer.Mean = (RoundedDouble) double.NaN;
+                input.ThicknessCoverageLayer.Mean = (RoundedDouble)double.NaN;
             }
         }
 
-        private void UpdateThicknessCoverageLayer()
+        private void TrySetThicknessCoverageLayer()
         {
             try
             {
-                input.ThicknessCoverageLayer.Mean = (RoundedDouble) PipingCalculationService.CalculateThicknessCoverageLayer(input);
+                input.ThicknessCoverageLayer.Mean = (RoundedDouble)PipingCalculationService.CalculateThicknessCoverageLayer(input);
             }
             catch (ArgumentOutOfRangeException)
             {
-                input.ThicknessCoverageLayer.Mean = (RoundedDouble) double.NaN;
+                input.ThicknessCoverageLayer.Mean = (RoundedDouble)double.NaN;
             }
         }