Index: Ringtoets/Piping/src/Ringtoets.Piping.Forms/PropertyClasses/PipingCalculationInputsProperties.cs
===================================================================
diff -u -r5076e379f409c3b5ba41eb98256e3dd5d140571c -r394db7c1bd905eb7444b9b2c47bcb5111bb63af6
--- Ringtoets/Piping/src/Ringtoets.Piping.Forms/PropertyClasses/PipingCalculationInputsProperties.cs	(.../PipingCalculationInputsProperties.cs)	(revision 5076e379f409c3b5ba41eb98256e3dd5d140571c)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Forms/PropertyClasses/PipingCalculationInputsProperties.cs	(.../PipingCalculationInputsProperties.cs)	(revision 394db7c1bd905eb7444b9b2c47bcb5111bb63af6)
@@ -101,15 +101,15 @@
         [ResourcesCategory(typeof(Resources), "Categories_General")]
         [ResourcesDisplayName(typeof(Resources), "PipingData_DampingFactorExit_DisplayName")]
         [ResourcesDescription(typeof(Resources), "PipingData_DampingFactorExit_Description")]
-        public DesignVariable DampingFactorExit
+        public DesignVariable<LognormalDistribution> DampingFactorExit
         {
             get
             {
                 return PipingSemiProbabilisticDesignValueFactory.GetDampingFactorExit(data.PipingData);
             }
             set
             {
-                data.PipingData.DampingFactorExit = (LognormalDistribution)value.Distribution;
+                data.PipingData.DampingFactorExit = value.Distribution;
                 data.PipingData.NotifyObservers();
             }
         }
@@ -118,15 +118,15 @@
         [ResourcesCategory(typeof(Resources), "Categories_General")]
         [ResourcesDisplayName(typeof(Resources), "PipingData_PhreaticLevelExit_DisplayName")]
         [ResourcesDescription(typeof(Resources), "PipingData_PhreaticLevelExit_Description")]
-        public DesignVariable PhreaticLevelExit
+        public DesignVariable<NormalDistribution> PhreaticLevelExit
         {
             get
             {
                 return PipingSemiProbabilisticDesignValueFactory.GetPhreaticLevelExit(data.PipingData);
             }
             set
             {
-                data.PipingData.PhreaticLevelExit = (NormalDistribution)value.Distribution;
+                data.PipingData.PhreaticLevelExit = value.Distribution;
                 data.PipingData.NotifyObservers();
             }
         }
@@ -162,15 +162,15 @@
         [ResourcesCategory(typeof(Resources), "Categories_General")]
         [ResourcesDisplayName(typeof(Resources), "PipingData_ThicknessCoverageLayer_DisplayName")]
         [ResourcesDescription(typeof(Resources), "PipingData_ThicknessCoverageLayer_Description")]
-        public DesignVariable ThicknessCoverageLayer
+        public DesignVariable<LognormalDistribution> ThicknessCoverageLayer
         {
             get
             {
                 return PipingSemiProbabilisticDesignValueFactory.GetThicknessCoverageLayer(data.PipingData);
             }
             set
             {
-                data.PipingData.ThicknessCoverageLayer = (LognormalDistribution)value.Distribution;
+                data.PipingData.ThicknessCoverageLayer = value.Distribution;
                 data.PipingData.NotifyObservers();
             }
         }
@@ -211,15 +211,15 @@
         [ResourcesCategory(typeof(Resources), "Categories_General")]
         [ResourcesDisplayName(typeof(Resources), "PipingData_SeepageLength_DisplayName")]
         [ResourcesDescription(typeof(Resources), "PipingData_SeepageLength_Description")]
-        public DesignVariable SeepageLength
+        public DesignVariable<LognormalDistribution> SeepageLength
         {
             get
             {
                 return PipingSemiProbabilisticDesignValueFactory.GetSeepageLength(data.PipingData);
             }
             set
             {
-                data.PipingData.SeepageLength = (LognormalDistribution)value.Distribution;
+                data.PipingData.SeepageLength = value.Distribution;
                 data.PipingData.NotifyObservers();
             }
         }
@@ -260,15 +260,15 @@
         [ResourcesCategory(typeof(Resources), "Categories_General")]
         [ResourcesDisplayName(typeof(Resources), "PipingData_Diameter70_DisplayName")]
         [ResourcesDescription(typeof(Resources), "PipingData_Diameter70_Description")]
-        public DesignVariable Diameter70
+        public DesignVariable<LognormalDistribution> Diameter70
         {
             get
             {
                 return PipingSemiProbabilisticDesignValueFactory.GetDiameter70(data.PipingData);
             }
             set
             {
-                data.PipingData.Diameter70 = (LognormalDistribution)value.Distribution;
+                data.PipingData.Diameter70 = value.Distribution;
                 data.PipingData.NotifyObservers();
             }
         }
@@ -277,15 +277,15 @@
         [ResourcesCategory(typeof(Resources), "Categories_General")]
         [ResourcesDisplayName(typeof(Resources), "PipingData_DarcyPermeability_DisplayName")]
         [ResourcesDescription(typeof(Resources), "PipingData_DarcyPermeability_Description")]
-        public DesignVariable DarcyPermeability
+        public DesignVariable<LognormalDistribution> DarcyPermeability
         {
             get
             {
                 return PipingSemiProbabilisticDesignValueFactory.GetDarcyPermeability(data.PipingData);
             }
             set
             {
-                data.PipingData.DarcyPermeability = (LognormalDistribution)value.Distribution;
+                data.PipingData.DarcyPermeability = value.Distribution;
                 data.PipingData.NotifyObservers();
             }
         }
@@ -326,15 +326,15 @@
         [ResourcesCategory(typeof(Resources), "Categories_General")]
         [ResourcesDisplayName(typeof(Resources), "PipingData_ThicknessAquiferLayer_DisplayName")]
         [ResourcesDescription(typeof(Resources), "PipingData_ThicknessAquiferLayer_Description")]
-        public DesignVariable ThicknessAquiferLayer
+        public DesignVariable<LognormalDistribution> ThicknessAquiferLayer
         {
             get
             {
                 return PipingSemiProbabilisticDesignValueFactory.GetThicknessAquiferLayer(data.PipingData);
             }
             set
             {
-                data.PipingData.ThicknessAquiferLayer = (LognormalDistribution)value.Distribution;
+                data.PipingData.ThicknessAquiferLayer = value.Distribution;
                 data.PipingData.NotifyObservers();
             }
         }