Index: Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Data/GeneralClosingStructuresInput.cs
===================================================================
diff -u -re570ba372fafe1802a4caae2ef9410b64457198b -ra964168b91bc9c287adacc368480575f0bcf8cd9
--- Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Data/GeneralClosingStructuresInput.cs	(.../GeneralClosingStructuresInput.cs)	(revision e570ba372fafe1802a4caae2ef9410b64457198b)
+++ Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Data/GeneralClosingStructuresInput.cs	(.../GeneralClosingStructuresInput.cs)	(revision a964168b91bc9c287adacc368480575f0bcf8cd9)
@@ -21,6 +21,7 @@
 
 using System;
 using Core.Common.Base.Data;
+using Ringtoets.ClosingStructures.Data.Properties;
 using Ringtoets.Common.Data.Probabilistics;
 
 namespace Ringtoets.ClosingStructures.Data
@@ -30,6 +31,8 @@
     /// </summary>
     public class GeneralClosingStructuresInput
     {
+        private int n2A;
+
         /// <summary>
         /// Initializes a new instance of the <see cref="GeneralClosingStructuresInput"/> class.
         /// </summary>
@@ -81,7 +84,21 @@
         /// <summary>
         /// Gets or sets the 'N2A' parameter used to factor in the 'length effect'.
         /// </summary>
-        public int N2A { get; set; }
+        public int N2A
+        {
+            get
+            {
+                return n2A;
+            }
+            set
+            {
+                if (value < 0 || value > 40)
+                {
+                    throw new ArgumentOutOfRangeException("value", Resources.N2A_Value_should_be_in_interval_0_40);
+                }
+                n2A = value;
+            }
+        }
 
         /// <summary>
         /// Gets the 'N' parameter used to factor in the 'length effect'.
Index: Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Data/Properties/Resources.Designer.cs
===================================================================
diff -u -r9e3639e810a22019da1a9fdf5aa5c433a43520c1 -ra964168b91bc9c287adacc368480575f0bcf8cd9
--- Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Data/Properties/Resources.Designer.cs	(.../Resources.Designer.cs)	(revision 9e3639e810a22019da1a9fdf5aa5c433a43520c1)
+++ Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Data/Properties/Resources.Designer.cs	(.../Resources.Designer.cs)	(revision a964168b91bc9c287adacc368480575f0bcf8cd9)
@@ -22,7 +22,7 @@
 //------------------------------------------------------------------------------
 // <auto-generated>
 //     This code was generated by a tool.
-//     Runtime Version:4.0.30319.42000
+//     Runtime Version:4.0.30319.18444
 //
 //     Changes to this file may cause incorrect behavior and will be lost if
 //     the code is regenerated.
@@ -107,5 +107,14 @@
                 return ResourceManager.GetString("ClosingStructuresFailureMechanism_DisplayName", resourceCulture);
             }
         }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to De waarde voor &apos;N2A&apos; moet in het bereik [0, 40] liggen..
+        /// </summary>
+        public static string N2A_Value_should_be_in_interval_0_40 {
+            get {
+                return ResourceManager.GetString("N2A_Value_should_be_in_interval_0_40", resourceCulture);
+            }
+        }
     }
 }
Index: Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Data/Properties/Resources.resx
===================================================================
diff -u -r9e3639e810a22019da1a9fdf5aa5c433a43520c1 -ra964168b91bc9c287adacc368480575f0bcf8cd9
--- Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Data/Properties/Resources.resx	(.../Resources.resx)	(revision 9e3639e810a22019da1a9fdf5aa5c433a43520c1)
+++ Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Data/Properties/Resources.resx	(.../Resources.resx)	(revision a964168b91bc9c287adacc368480575f0bcf8cd9)
@@ -126,4 +126,7 @@
   <data name="ClosingStructureInflowModelType_VerticalWall_DisplayName" xml:space="preserve">
     <value>Verticale wand</value>
   </data>
+  <data name="N2A_Value_should_be_in_interval_0_40" xml:space="preserve">
+    <value>De waarde voor 'N2A' moet in het bereik [0, 40] liggen.</value>
+  </data>
 </root>
\ No newline at end of file
Index: Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.Data.Test/GeneralClosingStructuresInputTest.cs
===================================================================
diff -u -re570ba372fafe1802a4caae2ef9410b64457198b -ra964168b91bc9c287adacc368480575f0bcf8cd9
--- Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.Data.Test/GeneralClosingStructuresInputTest.cs	(.../GeneralClosingStructuresInputTest.cs)	(revision e570ba372fafe1802a4caae2ef9410b64457198b)
+++ Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.Data.Test/GeneralClosingStructuresInputTest.cs	(.../GeneralClosingStructuresInputTest.cs)	(revision a964168b91bc9c287adacc368480575f0bcf8cd9)
@@ -19,7 +19,9 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
 using Core.Common.Base.Data;
+using Core.Common.TestUtil;
 using NUnit.Framework;
 using Ringtoets.Common.Data.Probabilistics;
 using Ringtoets.Common.Data.TestUtil;
@@ -76,8 +78,8 @@
 
         [Test]
         [TestCase(0, 1)]
-        [TestCase(3, 1.5)]
-        [TestCase(6, 3)]
+        [TestCase(8, 4)]
+        [TestCase(40, 20)]
         public void N_VariousValues_ReturnsExpectedValue(int n2A, double expected)
         {
             // Setup
@@ -93,6 +95,24 @@
             Assert.AreEqual(expected, n, n.GetAccuracy());
         }
 
+        [Test]
+        [TestCase(-456)]
+        [TestCase(-1)]
+        [TestCase(41)]
+        [TestCase(687)]
+        public void N2A_ValuesOutOfRange_ThrowArgumentOutOfRangeException(int invalidValue)
+        {
+            // Setup
+            var inputParameters = new GeneralClosingStructuresInput();
+
+            // Call
+            TestDelegate call = () => inputParameters.N2A = invalidValue;
+
+            // Assert
+            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentOutOfRangeException>(call,
+                                                                                                "De waarde voor 'N2A' moet in het bereik [0, 40] liggen.");
+        }
+
         private static void AssertAreEqual(double expected, RoundedDouble actual)
         {
             Assert.AreEqual(expected, actual, actual.GetAccuracy());