Index: Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Data/Input/Structures/StructuresClosureCalculationInput.cs
===================================================================
diff -u -rff02e836fe80bdeaadf7fb4c2e3d86f2a3c3c372 -rac36424e0dc0a1df15bdc91e107e5f13fd4c2369
--- Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Data/Input/Structures/StructuresClosureCalculationInput.cs	(.../StructuresClosureCalculationInput.cs)	(revision ff02e836fe80bdeaadf7fb4c2e3d86f2a3c3c372)
+++ Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Data/Input/Structures/StructuresClosureCalculationInput.cs	(.../StructuresClosureCalculationInput.cs)	(revision ac36424e0dc0a1df15bdc91e107e5f13fd4c2369)
@@ -26,11 +26,18 @@
     /// </summary>
     public class StructuresClosureCalculationInput : ExceedanceProbabilityCalculationInput
     {
+        private readonly HydraRingSection hydraRingSection;
+
         /// <summary>
         /// Creates a new instance of <see cref="StructuresClosureCalculationInput"/>.
         /// </summary>
         /// <param name="hydraulicBoundaryLocationId">The id of the hydraulic station to use during the calculation.</param>
-        public StructuresClosureCalculationInput(long hydraulicBoundaryLocationId) : base(hydraulicBoundaryLocationId) {}
+        /// <param name="hydraRingSection">The section to use during the calculation.</param>
+        public StructuresClosureCalculationInput(long hydraulicBoundaryLocationId, HydraRingSection hydraRingSection)
+            : base(hydraulicBoundaryLocationId)
+        {
+            this.hydraRingSection = hydraRingSection;
+        }
 
         public override HydraRingFailureMechanismType FailureMechanismType
         {
@@ -52,8 +59,21 @@
         {
             get
             {
-                throw new System.NotImplementedException();
+                return hydraRingSection;
             }
         }
+
+        public override int? GetSubMechanismModelId(int subMechanismId)
+        {
+            switch (subMechanismId)
+            {
+                case 424:
+                    return 106;
+                case 425:
+                    return 111;
+                default:
+                    return null;
+            }
+        }
     }
 }
\ No newline at end of file
Index: Ringtoets/HydraRing/test/Ringtoets.HydraRing.Calculation.Test/Data/Input/Structures/StructuresClosureCalculationInputTest.cs
===================================================================
diff -u -rff02e836fe80bdeaadf7fb4c2e3d86f2a3c3c372 -rac36424e0dc0a1df15bdc91e107e5f13fd4c2369
--- Ringtoets/HydraRing/test/Ringtoets.HydraRing.Calculation.Test/Data/Input/Structures/StructuresClosureCalculationInputTest.cs	(.../StructuresClosureCalculationInputTest.cs)	(revision ff02e836fe80bdeaadf7fb4c2e3d86f2a3c3c372)
+++ Ringtoets/HydraRing/test/Ringtoets.HydraRing.Calculation.Test/Data/Input/Structures/StructuresClosureCalculationInputTest.cs	(.../StructuresClosureCalculationInputTest.cs)	(revision ac36424e0dc0a1df15bdc91e107e5f13fd4c2369)
@@ -34,16 +34,32 @@
         {
             // Setup
             const int hydraulicBoundaryLocationId = 1000;
+            var hydraRingSection = new HydraRingSection(1, double.NaN, double.NaN);
 
             // Call
-            var input = new StructuresClosureCalculationInput(hydraulicBoundaryLocationId);
+            var input = new StructuresClosureCalculationInput(hydraulicBoundaryLocationId, hydraRingSection);
 
             // Assert
             Assert.IsInstanceOf<ExceedanceProbabilityCalculationInput>(input);
             Assert.AreEqual(hydraulicBoundaryLocationId, input.HydraulicBoundaryLocationId);
             Assert.AreEqual(1, input.CalculationTypeId);
             Assert.AreEqual(65, input.VariableId);
             Assert.AreEqual(HydraRingFailureMechanismType.StructuresClosure, input.FailureMechanismType);
+            Assert.AreSame(hydraRingSection, input.Section);
         }
+
+        [Test]
+        [TestCase(423, null)]
+        [TestCase(424, 106)]
+        [TestCase(425, 111)]
+        [TestCase(426, null)]
+        public void GetSubMechanismModelId_Always_ReturnsExpectedValues(int subMechanismModelId, int? expectedSubMechanismModelId)
+        {
+            // Call
+            var input = new StructuresClosureCalculationInput(1, new HydraRingSection(1, double.NaN, double.NaN));
+
+            // Assert
+            Assert.AreEqual(expectedSubMechanismModelId, input.GetSubMechanismModelId(subMechanismModelId));
+        }
     }
 }
\ No newline at end of file