Index: Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Data/GeneralClosingStructuresInput.cs
===================================================================
diff -u -r60f9aeb20e9dee9cb4109c38187de25272c2ab06 -r8f8b6680fa20b2e392b8c5b3cd811556721734fc
--- Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Data/GeneralClosingStructuresInput.cs	(.../GeneralClosingStructuresInput.cs)	(revision 60f9aeb20e9dee9cb4109c38187de25272c2ab06)
+++ Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Data/GeneralClosingStructuresInput.cs	(.../GeneralClosingStructuresInput.cs)	(revision 8f8b6680fa20b2e392b8c5b3cd811556721734fc)
@@ -57,6 +57,12 @@
             };
 
             ModelFactorInflowVolume = new RoundedDouble(2, 1);
+
+            ModelFactorLongThreshold = new NormalDistribution(2)
+            {
+                Mean = (RoundedDouble) 0.9,
+                StandardDeviation = (RoundedDouble) 0.05
+            };
         }
 
         #region Constants
@@ -129,6 +135,11 @@
         /// </summary>
         public RoundedDouble ModelFactorInflowVolume { get; }
 
+        /// <summary>
+        /// Gets the model factor for long threshold.
+        /// </summary>
+        public NormalDistribution ModelFactorLongThreshold { get; }
+
         #endregion
     }
 }
\ No newline at end of file
Index: Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.Data.Test/GeneralClosingStructuresInputTest.cs
===================================================================
diff -u -r60f9aeb20e9dee9cb4109c38187de25272c2ab06 -r8f8b6680fa20b2e392b8c5b3cd811556721734fc
--- Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.Data.Test/GeneralClosingStructuresInputTest.cs	(.../GeneralClosingStructuresInputTest.cs)	(revision 60f9aeb20e9dee9cb4109c38187de25272c2ab06)
+++ Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.Data.Test/GeneralClosingStructuresInputTest.cs	(.../GeneralClosingStructuresInputTest.cs)	(revision 8f8b6680fa20b2e392b8c5b3cd811556721734fc)
@@ -47,6 +47,12 @@
                 StandardDeviation = (RoundedDouble) 0.2
             };
 
+            var modelFactorLongThreshold = new NormalDistribution(2)
+            {
+                Mean = (RoundedDouble)0.9,
+                StandardDeviation = (RoundedDouble)0.05
+            };
+
             // Call
             var inputParameters = new GeneralClosingStructuresInput();
 
@@ -60,7 +66,8 @@
 
             DistributionAssert.AreEqual(modelFactorOvertoppingFlow, inputParameters.ModelFactorOvertoppingFlow);
             DistributionAssert.AreEqual(modelFactorStorageVolume, inputParameters.ModelFactorStorageVolume);
-
+            DistributionAssert.AreEqual(modelFactorLongThreshold, inputParameters.ModelFactorLongThreshold);
+            
             Assert.AreEqual(2, inputParameters.ModelFactorInflowVolume.NumberOfDecimalPlaces);
             AssertAreEqual(1.0, inputParameters.ModelFactorInflowVolume);
         }
@@ -98,8 +105,8 @@
             TestDelegate call = () => inputParameters.N2A = invalidValue;
 
             // Assert
-            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentOutOfRangeException>(call,
-                                                                                                "De waarde voor 'N2A' moet in het bereik [0, 40] liggen.");
+            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentOutOfRangeException>(
+                call, "De waarde voor 'N2A' moet in het bereik [0, 40] liggen.");
         }
 
         private static void AssertAreEqual(double expected, RoundedDouble actual)