Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/Location.cs
===================================================================
diff -u -r2554 -r2560
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/Location.cs	(.../Location.cs)	(revision 2554)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/Location.cs	(.../Location.cs)	(revision 2560)
@@ -169,7 +169,7 @@
         private SurfaceLine2 surfaceLine2;
         private string surfaceLineId = "";
         private double trafficLoad = 0;
-        private double degreeOfConsolidation = 0;
+        private double? degreeOfConsolidation;
         private bool useNewDikeSlopeInside;
         private bool useNewDikeSlopeOutside;
         private bool useNewDikeTopWidth;
@@ -366,7 +366,7 @@
         [Format("F3")]
         [Category(DikeCategory)]
         [PropertyOrder(1, 21)]
-        public virtual double TL_DegreeOfConsolidation
+        public virtual double? TL_DegreeOfConsolidation
         {
             get
             {
@@ -1751,7 +1751,10 @@
             nameValuePairs.Add(LocationParameterNames.StabilityShoulderGrowDeltaX, StabilityShoulderGrowDeltaX.ToString(numberFormatInfo));
             nameValuePairs.Add(LocationParameterNames.StabilitySlopeAdaptionDeltaX, StabilitySlopeAdaptionDeltaX.ToString(numberFormatInfo));
             nameValuePairs.Add(LocationParameterNames.TrafficLoad, TrafficLoad.ToString(numberFormatInfo));
-            nameValuePairs.Add(LocationParameterNames.TL_DegreeOfConsolidation, TL_DegreeOfConsolidation.ToString(numberFormatInfo));
+            if (TL_DegreeOfConsolidation.HasValue)
+            {
+                nameValuePairs.Add(LocationParameterNames.TL_DegreeOfConsolidation, TL_DegreeOfConsolidation.Value.ToString(numberFormatInfo));
+            }
             nameValuePairs.Add(LocationParameterNames.MinimalCircleDepth, MinimalCircleDepth.ToString(numberFormatInfo));
             nameValuePairs.Add(LocationParameterNames.DistanceToEntryPoint, DistanceToEntryPoint.ToString(numberFormatInfo));
             nameValuePairs.Add(LocationParameterNames.StabilityZoneType, StabilityZoneType.ToString());
Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/IO/CombineImportedData.cs
===================================================================
diff -u -r2529 -r2560
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/IO/CombineImportedData.cs	(.../CombineImportedData.cs)	(revision 2529)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/IO/CombineImportedData.cs	(.../CombineImportedData.cs)	(revision 2560)
@@ -762,7 +762,7 @@
                         location.DampingFactorPL4 = locationRecord.DampingFactorPl4.GetValueOrDefault(location.DampingFactorPL4);
                         location.PenetrationLength = locationRecord.PenetrationLength.GetValueOrDefault(location.PenetrationLength);
                         location.TrafficLoad = locationRecord.TrafficLoad.GetValueOrDefault(location.TrafficLoad);
-                        location.TL_DegreeOfConsolidation = locationRecord.TL_DegreeOfConsolidation.GetValueOrDefault(location.TL_DegreeOfConsolidation);
+                        location.TL_DegreeOfConsolidation = locationRecord.TL_DegreeOfConsolidation;
                         location.PLLineCreationMethod = locationRecord.PLLineCreationMethod.GetValueOrDefault(location.PLLineCreationMethod);
                         if (locationRecord.IntrusionVerticalWaterPressure.HasValue)
                         {
Index: DamClients/DamUI/trunk/src/Dam/Tests/LocationTest.cs
===================================================================
diff -u -r2529 -r2560
--- DamClients/DamUI/trunk/src/Dam/Tests/LocationTest.cs	(.../LocationTest.cs)	(revision 2529)
+++ DamClients/DamUI/trunk/src/Dam/Tests/LocationTest.cs	(.../LocationTest.cs)	(revision 2560)
@@ -57,7 +57,6 @@
             const bool areLocalXzObjectsCreated = false;
             const double penetrationLength = 0.0;
             const double trafficLoad = 0.0;
-            const double tL_DegreeOfConsolidation = 0.0;
             const PLLineCreationMethod plLineCreationMethod = PLLineCreationMethod.ExpertKnowledgeRRD;
             const double stabilityShoulderGrowSlope = 0.3333333333333;
             const double stabilityShoulderGrowDeltaX = 2.0;
@@ -70,7 +69,7 @@
             Assert.AreEqual(areLocalXzObjectsCreated, actualLocation.AreLocalXZObjectsCreated);
             Assert.AreEqual(penetrationLength, actualLocation.PenetrationLength);
             Assert.AreEqual(trafficLoad, actualLocation.TrafficLoad);
-            Assert.AreEqual(tL_DegreeOfConsolidation, actualLocation.TL_DegreeOfConsolidation);
+            Assert.AreEqual(null, actualLocation.TL_DegreeOfConsolidation);
             Assert.AreEqual(plLineCreationMethod, actualLocation.PLLineCreationMethod);
             Assert.AreEqual(IntrusionVerticalWaterPressureType.Standard, actualLocation.IntrusionVerticalWaterPressure);
             Assert.AreEqual(stabilityShoulderGrowSlope, actualLocation.StabilityShoulderGrowSlope, 1e-12);
Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/DamEngineIo/FillXmlInputFromDamUi.cs
===================================================================
diff -u -r2526 -r2560
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/DamEngineIo/FillXmlInputFromDamUi.cs	(.../FillXmlInputFromDamUi.cs)	(revision 2526)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/DamEngineIo/FillXmlInputFromDamUi.cs	(.../FillXmlInputFromDamUi.cs)	(revision 2560)
@@ -632,8 +632,8 @@
                     ZoneAreaRestSlopeCrestWidth = location.ZoneAreaRestSlopeCrestWidth,
                     TrafficLoadSpecified = true,
                     TrafficLoad = location.TrafficLoad,
-                    TrafficLoadDegreeOfConsolidationSpecified = true,
-                    TrafficLoadDegreeOfConsolidation = location.TL_DegreeOfConsolidation,
+                    TrafficLoadDegreeOfConsolidationSpecified = location.TL_DegreeOfConsolidation.HasValue,
+                    TrafficLoadDegreeOfConsolidation = location.TL_DegreeOfConsolidation?? 0.0,
                     MinimumCircleDepthSpecified = true,
                     MinimumCircleDepth = location.MinimalCircleDepth
                 };