Index: Ringtoets/HydraRing/test/Ringtoets.HydraRing.Calculation.Test/Data/Input/Structures/StructuresClosureLowSillCalculationInputTest.cs
===================================================================
diff -u -r9a46b1398c3a83b8f5c06254ccb9808f33eb2531 -r2a896243ca24205f8e98db1b61e8148d1d9b9062
--- Ringtoets/HydraRing/test/Ringtoets.HydraRing.Calculation.Test/Data/Input/Structures/StructuresClosureLowSillCalculationInputTest.cs	(.../StructuresClosureLowSillCalculationInputTest.cs)	(revision 9a46b1398c3a83b8f5c06254ccb9808f33eb2531)
+++ Ringtoets/HydraRing/test/Ringtoets.HydraRing.Calculation.Test/Data/Input/Structures/StructuresClosureLowSillCalculationInputTest.cs	(.../StructuresClosureLowSillCalculationInputTest.cs)	(revision 2a896243ca24205f8e98db1b61e8148d1d9b9062)
@@ -37,10 +37,10 @@
         {
             // Setup
             const int hydraulicBoundaryLocationId = 1000;
-            var section = new HydraRingSection(1, double.NaN, double.NaN);
             var forelandPoints = Enumerable.Empty<HydraRingForelandPoint>();
             var breakWater = new HydraRingBreakWater(1, 1.1);
 
+            const double sectionNormal = 31.1;
             const double gravitationalAcceleration = 1.1;
             const double factorStormDurationOpenStructure = 2.2;
             const double failureProbabilityOpenStructure = 3.3;
@@ -73,7 +73,8 @@
             const double widthFlowAperturesVariation = 30.0;
 
             // Call
-            var input = new StructuresClosureLowSillCalculationInput(hydraulicBoundaryLocationId, section,
+            var input = new StructuresClosureLowSillCalculationInput(hydraulicBoundaryLocationId,
+                                                                     sectionNormal,
                                                                      forelandPoints, breakWater,
                                                                      gravitationalAcceleration,
                                                                      factorStormDurationOpenStructure,
@@ -101,7 +102,11 @@
             Assert.AreEqual(1, input.CalculationTypeId);
             Assert.AreEqual(58, input.VariableId);
             Assert.AreEqual(HydraRingFailureMechanismType.StructuresClosure, input.FailureMechanismType);
-            Assert.AreSame(section, input.Section);
+
+            HydraRingSection section = input.Section;
+            Assert.AreEqual(1, section.SectionId);
+            Assert.IsNaN(section.SectionLength);
+            Assert.AreEqual(sectionNormal, section.CrossSectionNormal);
             Assert.AreSame(forelandPoints, input.ForelandsPoints);
             Assert.AreSame(breakWater, input.BreakWater);
             HydraRingDataEqualityHelper.AreEqual(GetDefaultVariables().ToArray(), input.Variables.ToArray());
@@ -115,7 +120,7 @@
         public void GetSubMechanismModelId_Always_ReturnsExpectedValues(int subMechanismModelId, int? expectedSubMechanismModelId)
         {
             // Setup
-            var input = new StructuresClosureLowSillCalculationInput(111, new HydraRingSection(1, double.NaN, double.NaN),
+            var input = new StructuresClosureLowSillCalculationInput(111, double.NaN,
                                                                      Enumerable.Empty<HydraRingForelandPoint>(),
                                                                      new HydraRingBreakWater(1, 1.1),
                                                                      1.1, 222, 333, 5.5, 6, 7.7, 8.8, 11, 22, 33, 44, 55,