Index: Ringtoets/Common/src/Ringtoets.Common.Data/AssessmentSection/AssessmentSectionExtensions.cs
===================================================================
diff -u -r0eddea1a45f0d9efb0a2a12e90eb99e814d1becb -re5c50bb83746132c8263dc016f768197f83c33c5
--- Ringtoets/Common/src/Ringtoets.Common.Data/AssessmentSection/AssessmentSectionExtensions.cs	(.../AssessmentSectionExtensions.cs)	(revision 0eddea1a45f0d9efb0a2a12e90eb99e814d1becb)
+++ Ringtoets/Common/src/Ringtoets.Common.Data/AssessmentSection/AssessmentSectionExtensions.cs	(.../AssessmentSectionExtensions.cs)	(revision e5c50bb83746132c8263dc016f768197f83c33c5)
@@ -89,6 +89,58 @@
         }
 
         /// <summary>
+        /// Gets the normative <see cref="HydraulicBoundaryLocationCalculation"/> for a <see cref="HydraulicBoundaryLocation"/>.
+        /// </summary>
+        /// <param name="assessmentSection">The assessment section to get the <see cref="HydraulicBoundaryLocationCalculation"/> from.</param>
+        /// <param name="hydraulicBoundaryLocation">The hydraulic boundary location to get the normative
+        /// <see cref="HydraulicBoundaryLocationCalculation"/> for.</param>
+        /// <returns>The normative <see cref="HydraulicBoundaryLocationCalculation"/> or <c>null</c> when:
+        /// <list type="bullet">
+        /// <item><paramref name="hydraulicBoundaryLocation"/> is <c>null</c>;</item>
+        /// <item><paramref name="hydraulicBoundaryLocation"/> is not part of <paramref name="assessmentSection"/>;</item>
+        /// <item><paramref name="hydraulicBoundaryLocation"/> contains no corresponding calculation.</item>
+        /// </list>
+        /// </returns>
+        /// <exception cref="ArgumentNullException">Thrown when <paramref name="assessmentSection"/>
+        /// is <c>null</c>.</exception>
+        /// <exception cref="InvalidEnumArgumentException">Thrown when <paramref name="assessmentSection"/>
+        /// contains an invalid value of <see cref="NormType"/>.</exception>
+        /// <exception cref="NotSupportedException">Thrown when <paramref name="assessmentSection"/>
+        /// contains a valid value of <see cref="NormType"/>, but unsupported.</exception>
+        public static HydraulicBoundaryLocationCalculation GetNormativeHydraulicBoundaryLocationCalculation(this IAssessmentSection assessmentSection,
+                                                                                                            HydraulicBoundaryLocation hydraulicBoundaryLocation)
+        {
+            if (assessmentSection == null)
+            {
+                throw new ArgumentNullException(nameof(assessmentSection));
+            }
+
+            NormType normType = assessmentSection.FailureMechanismContribution.NormativeNorm;
+
+            if (!Enum.IsDefined(typeof(NormType), normType))
+            {
+                throw new InvalidEnumArgumentException(nameof(normType),
+                                                       (int)normType,
+                                                       typeof(NormType));
+            }
+
+            IEnumerable<HydraulicBoundaryLocationCalculation> calculations;
+            switch (normType)
+            {
+                case NormType.Signaling:
+                    calculations = assessmentSection.WaterLevelCalculationsForSignalingNorm;
+                    break;
+                case NormType.LowerLimit:
+                    calculations = assessmentSection.WaterLevelCalculationsForLowerLimitNorm;
+                    break;
+                default:
+                    throw new NotSupportedException();
+            }
+
+            return GetHydraulicBoundaryLocationCalculationFromCalculations(hydraulicBoundaryLocation, calculations);
+        }
+
+        /// <summary>
         /// Gets the assessment level for a <see cref="HydraulicBoundaryLocation"/> based on <see cref="AssessmentSectionCategoryType"/>.
         /// </summary>
         /// <param name="assessmentSection">The assessment section to get the assessment level from.</param>
Index: Ringtoets/Common/test/Ringtoets.Common.Data.Test/AssessmentSection/AssessmentSectionExtensionsTest.cs
===================================================================
diff -u -r346957cc101c65f06201d346eff71d3454aa7e31 -re5c50bb83746132c8263dc016f768197f83c33c5
--- Ringtoets/Common/test/Ringtoets.Common.Data.Test/AssessmentSection/AssessmentSectionExtensionsTest.cs	(.../AssessmentSectionExtensionsTest.cs)	(revision 346957cc101c65f06201d346eff71d3454aa7e31)
+++ Ringtoets/Common/test/Ringtoets.Common.Data.Test/AssessmentSection/AssessmentSectionExtensionsTest.cs	(.../AssessmentSectionExtensionsTest.cs)	(revision e5c50bb83746132c8263dc016f768197f83c33c5)
@@ -117,12 +117,12 @@
         }
 
         [Test]
-        [TestCaseSource(nameof(GetNormativeAssessementLevelConfigurationPerNormType))]
+        [TestCaseSource(nameof(GetNormativeHydraulicBoundaryLocationCalculationPerNormType))]
         public void GetNormativeAssessmentLevel_HydraulicBoundaryLocationWithOutput_ReturnsCorrespondingAssessmentLevel(
             IAssessmentSection assessmentSection,
             HydraulicBoundaryLocation hydraulicBoundaryLocation,
             NormType normType,
-            RoundedDouble expectedNormativeAssessmentLevel)
+            HydraulicBoundaryLocationCalculation calculation)
         {
             // Setup
             assessmentSection.FailureMechanismContribution.NormativeNorm = normType;
@@ -131,6 +131,7 @@
             RoundedDouble normativeAssessmentLevel = assessmentSection.GetNormativeAssessmentLevel(hydraulicBoundaryLocation);
 
             // Assert
+            RoundedDouble expectedNormativeAssessmentLevel = calculation.Output.Result;
             Assert.AreEqual(expectedNormativeAssessmentLevel, normativeAssessmentLevel);
         }
 
@@ -312,6 +313,86 @@
         }
 
         [Test]
+        public void GetNormativeHydraulicBoundaryLocationCalculation_AssessmentSectionNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate call = () => AssessmentSectionExtensions.GetNormativeHydraulicBoundaryLocationCalculation(null, new TestHydraulicBoundaryLocation());
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(call);
+            Assert.AreEqual("assessmentSection", exception.ParamName);
+        }
+
+        [Test]
+        public void GetNormativeHydraulicBoundaryLocationCalculation_AssessmentSectionWithInvalidNormType_ThrowsInvalidEnumArgumentException()
+        {
+            // Setup
+            const int invalidValue = 9999;
+
+            var assessmentSection = new AssessmentSectionStub();
+
+            assessmentSection.FailureMechanismContribution.NormativeNorm = (NormType)invalidValue;
+
+            // Call
+            TestDelegate test = () => assessmentSection.GetNormativeHydraulicBoundaryLocationCalculation(new TestHydraulicBoundaryLocation());
+
+            // Assert
+            string expectedMessage = $"The value of argument 'normType' ({invalidValue}) is invalid for Enum type '{nameof(NormType)}'.";
+            string parameterName = TestHelper.AssertThrowsArgumentExceptionAndTestMessage<InvalidEnumArgumentException>(test, expectedMessage).ParamName;
+            Assert.AreEqual("normType", parameterName);
+        }
+
+        [Test]
+        public void GetNormativeHydraulicBoundaryLocationCalculation_HydraulicBoundaryLocationNull_ReturnsNull()
+        {
+            // Setup
+            var random = new Random(21);
+            var assessmentSection = new AssessmentSectionStub();
+            assessmentSection.FailureMechanismContribution.NormativeNorm = random.NextEnumValue<NormType>();
+
+            // Call
+            HydraulicBoundaryLocationCalculation hydraulicBoundaryLocationCalculation = assessmentSection.GetNormativeHydraulicBoundaryLocationCalculation(null);
+
+            // Assert
+            Assert.IsNull(hydraulicBoundaryLocationCalculation);
+        }
+
+        [Test]
+        public void GetNormativeHydraulicBoundaryLocationCalculation_NoCorrespondingCalculation_ReturnsNull()
+        {
+            // Setup
+            var random = new Random(21);
+            var assessmentSection = new AssessmentSectionStub();
+            assessmentSection.FailureMechanismContribution.NormativeNorm = random.NextEnumValue<NormType>();
+
+            // Call
+            HydraulicBoundaryLocationCalculation hydraulicBoundaryLocationCalculation =
+                assessmentSection.GetNormativeHydraulicBoundaryLocationCalculation(new TestHydraulicBoundaryLocation());
+
+            // Assert
+            Assert.IsNull(hydraulicBoundaryLocationCalculation);
+        }
+
+        [Test]
+        [TestCaseSource(nameof(GetNormativeHydraulicBoundaryLocationCalculationPerNormType))]
+        public void GetNormativeHydraulicBoundaryLocationCalculation_HydraulicBoundaryLocation_ReturnsCorrespondingCalculation(
+            IAssessmentSection assessmentSection,
+            HydraulicBoundaryLocation hydraulicBoundaryLocation,
+            NormType normType,
+            HydraulicBoundaryLocationCalculation calculation)
+        {
+            // Setup
+            assessmentSection.FailureMechanismContribution.NormativeNorm = normType;
+
+            // Call
+            HydraulicBoundaryLocationCalculation normativeAssessmentLevel = 
+                assessmentSection.GetNormativeHydraulicBoundaryLocationCalculation(hydraulicBoundaryLocation);
+
+            // Assert
+            Assert.AreSame(calculation, normativeAssessmentLevel);
+        }
+
+        [Test]
         public void GetNorm_AssessmentSectionNull_ThrowsArgumentNullException()
         {
             // Call
@@ -354,8 +435,47 @@
             Assert.AreEqual(expectedNorm, norm);
         }
 
-        private static IEnumerable GetNormativeAssessementLevelConfigurationPerNormType()
+        private static IEnumerable GetNormConfigurationPerAssessmentSectionCategoryType()
         {
+            const double signalingNorm = 0.002;
+            const double lowerLimitNorm = 0.005;
+
+            var assessmentSection = new AssessmentSectionStub
+            {
+                FailureMechanismContribution =
+                {
+                    LowerLimitNorm = lowerLimitNorm,
+                    SignalingNorm = signalingNorm
+                }
+            };
+
+            yield return new TestCaseData(
+                assessmentSection,
+                AssessmentSectionCategoryType.FactorizedSignalingNorm,
+                signalingNorm / 30
+            ).SetName("FactorizedSignalingNorm");
+
+            yield return new TestCaseData(
+                assessmentSection,
+                AssessmentSectionCategoryType.SignalingNorm,
+                signalingNorm
+            ).SetName("SignalingNorm");
+
+            yield return new TestCaseData(
+                assessmentSection,
+                AssessmentSectionCategoryType.LowerLimitNorm,
+                lowerLimitNorm
+            ).SetName("LowerLimitNorm");
+
+            yield return new TestCaseData(
+                assessmentSection,
+                AssessmentSectionCategoryType.FactorizedLowerLimitNorm,
+                lowerLimitNorm * 30
+            ).SetName("FactorizedLowerLimitNorm");
+        }
+
+        private static IEnumerable<TestCaseData> GetNormativeHydraulicBoundaryLocationCalculationPerNormType()
+        {
             var assessmentSection = new AssessmentSectionStub();
             var hydraulicBoundaryLocation = new TestHydraulicBoundaryLocation();
 
@@ -368,53 +488,53 @@
                 assessmentSection,
                 hydraulicBoundaryLocation,
                 NormType.Signaling,
-                assessmentSection.WaterLevelCalculationsForSignalingNorm.ElementAt(0).Output.Result
+                assessmentSection.WaterLevelCalculationsForSignalingNorm.ElementAt(0)
             ).SetName("SignalingNorm");
 
             yield return new TestCaseData(
                 assessmentSection,
                 hydraulicBoundaryLocation,
                 NormType.LowerLimit,
-                assessmentSection.WaterLevelCalculationsForLowerLimitNorm.ElementAt(0).Output.Result
+                assessmentSection.WaterLevelCalculationsForLowerLimitNorm.ElementAt(0)
             ).SetName("LowerLimitNorm");
         }
 
-        private static IEnumerable GetNormConfigurationPerAssessmentSectionCategoryType()
+        private static IEnumerable<TestCaseData> GetHydraulicBoundaryLocationCalculationConfigurationPerAssessmentSectionCategoryType()
         {
-            const double signalingNorm = 0.002;
-            const double lowerLimitNorm = 0.005;
+            var assessmentSection = new AssessmentSectionStub();
+            var hydraulicBoundaryLocation = new TestHydraulicBoundaryLocation();
 
-            var assessmentSection = new AssessmentSectionStub
+            assessmentSection.SetHydraulicBoundaryLocationCalculations(new[]
             {
-                FailureMechanismContribution =
-                {
-                    LowerLimitNorm = lowerLimitNorm,
-                    SignalingNorm = signalingNorm
-                }
-            };
+                hydraulicBoundaryLocation
+            }, true);
 
             yield return new TestCaseData(
                 assessmentSection,
+                hydraulicBoundaryLocation,
                 AssessmentSectionCategoryType.FactorizedSignalingNorm,
-                signalingNorm / 30
+                assessmentSection.WaterLevelCalculationsForFactorizedSignalingNorm.ElementAt(0)
             ).SetName("FactorizedSignalingNorm");
 
             yield return new TestCaseData(
                 assessmentSection,
+                hydraulicBoundaryLocation,
                 AssessmentSectionCategoryType.SignalingNorm,
-                signalingNorm
+                assessmentSection.WaterLevelCalculationsForSignalingNorm.ElementAt(0)
             ).SetName("SignalingNorm");
 
             yield return new TestCaseData(
                 assessmentSection,
+                hydraulicBoundaryLocation,
                 AssessmentSectionCategoryType.LowerLimitNorm,
-                lowerLimitNorm
+                assessmentSection.WaterLevelCalculationsForLowerLimitNorm.ElementAt(0)
             ).SetName("LowerLimitNorm");
 
             yield return new TestCaseData(
                 assessmentSection,
+                hydraulicBoundaryLocation,
                 AssessmentSectionCategoryType.FactorizedLowerLimitNorm,
-                lowerLimitNorm * 30
+                assessmentSection.WaterLevelCalculationsForFactorizedLowerLimitNorm.ElementAt(0)
             ).SetName("FactorizedLowerLimitNorm");
         }
     }