Index: Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.IO/Configurations/ClosingStructuresCalculationConfigurationWriter.cs
===================================================================
diff -u -rf88343c0590cb04c7135ce141872940e59325927 -r3a60f4df420a7669a047880a924bf4a0ff67c265
--- Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.IO/Configurations/ClosingStructuresCalculationConfigurationWriter.cs	(.../ClosingStructuresCalculationConfigurationWriter.cs)	(revision f88343c0590cb04c7135ce141872940e59325927)
+++ Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.IO/Configurations/ClosingStructuresCalculationConfigurationWriter.cs	(.../ClosingStructuresCalculationConfigurationWriter.cs)	(revision 3a60f4df420a7669a047880a924bf4a0ff67c265)
@@ -48,12 +48,7 @@
 
         protected override void WriteSpecificStructureParameters(ClosingStructuresCalculationConfiguration configuration, XmlWriter writer)
         {
-            if (configuration.InflowModelType != null)
-            {
-                writer.WriteElementString(
-                    ClosingStructuresConfigurationSchemaIdentifiers.InflowModelType,
-                    new ConfigurationClosingStructureInflowModelTypeConverter().ConvertToInvariantString(configuration.InflowModelType));
-            }
+            WriteConfigurationInflowModelTypeWhenAvailable(writer, configuration.InflowModelType);
 
             WriteElementWhenContentAvailable(writer,
                                              ClosingStructuresConfigurationSchemaIdentifiers.FactorStormDurationOpenStructure,
@@ -90,5 +85,25 @@
                                            ClosingStructuresConfigurationSchemaIdentifiers.LevelCrestStructureNotClosingStochastName,
                                            configuration.LevelCrestStructureNotClosing);
         }
+
+        /// <summary>
+        /// Writes the <paramref name="inflowModelType"/> in XML format to file.
+        /// </summary>
+        /// <param name="writer">The writer to use for writing.</param>
+        /// <param name="inflowModelType">The inflow model type to write.</param>
+        /// <exception cref="InvalidOperationException">Thrown when the <paramref name="writer"/> 
+        /// is closed.</exception>
+        /// <exception cref="NotSupportedException">Thrown when the conversion
+        /// of <paramref name="inflowModelType"/> cannot be performed.</exception>
+        private static void WriteConfigurationInflowModelTypeWhenAvailable(XmlWriter writer,
+                                                                           ConfigurationClosingStructureInflowModelType? inflowModelType)
+        {
+            if (inflowModelType.HasValue)
+            {
+                writer.WriteElementString(
+                    ClosingStructuresConfigurationSchemaIdentifiers.InflowModelType,
+                    new ConfigurationClosingStructureInflowModelTypeConverter().ConvertToInvariantString(inflowModelType));
+            }
+        }
     }
 }
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