Index: Riskeer/ClosingStructures/src/Riskeer.ClosingStructures.Data/ClosingStructuresInput.cs
===================================================================
diff -u -r67a51cfa8f4937094d9f10b14b0aa8e64a4f7576 -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/ClosingStructures/src/Riskeer.ClosingStructures.Data/ClosingStructuresInput.cs	(.../ClosingStructuresInput.cs)	(revision 67a51cfa8f4937094d9f10b14b0aa8e64a4f7576)
+++ Riskeer/ClosingStructures/src/Riskeer.ClosingStructures.Data/ClosingStructuresInput.cs	(.../ClosingStructuresInput.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -43,7 +43,7 @@
 
         private NormalDistribution thresholdHeightOpenWeir;
         private NormalDistribution modelFactorSuperCriticalFlow;
-        private NormalDistribution drainCoefficient;
+        private LogNormalDistribution drainCoefficient;
         private LogNormalDistribution areaFlowApertures;
         private NormalDistribution levelCrestStructureNotClosing;
         private NormalDistribution insideWaterLevel;
@@ -62,7 +62,7 @@
             factorStormDurationOpenStructure = new RoundedDouble(2, 1.0);
             deviationWaveDirection = new RoundedDouble(deviationWaveDirectionNumberOfDecimals);
 
-            drainCoefficient = new NormalDistribution(2)
+            drainCoefficient = new LogNormalDistribution(2)
             {
                 Mean = (RoundedDouble) 1,
                 StandardDeviation = (RoundedDouble) 0.2
@@ -146,7 +146,7 @@
 
             clone.thresholdHeightOpenWeir = (NormalDistribution) ThresholdHeightOpenWeir.Clone();
             clone.modelFactorSuperCriticalFlow = (NormalDistribution) ModelFactorSuperCriticalFlow.Clone();
-            clone.drainCoefficient = (NormalDistribution) DrainCoefficient.Clone();
+            clone.drainCoefficient = (LogNormalDistribution) DrainCoefficient.Clone();
             clone.areaFlowApertures = (LogNormalDistribution) AreaFlowApertures.Clone();
             clone.levelCrestStructureNotClosing = (NormalDistribution) LevelCrestStructureNotClosing.Clone();
             clone.insideWaterLevel = (NormalDistribution) InsideWaterLevel.Clone();
@@ -254,7 +254,7 @@
         /// Gets or sets the drain coefficient.
         /// </summary>
         /// <remarks>Only sets the mean.</remarks>
-        public NormalDistribution DrainCoefficient
+        public LogNormalDistribution DrainCoefficient
         {
             get
             {
Index: Riskeer/ClosingStructures/src/Riskeer.ClosingStructures.Forms/PropertyClasses/ClosingStructuresInputContextProperties.cs
===================================================================
diff -u -rd3b94aacb873473ebe92d56b4e48341bf4b26412 -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/ClosingStructures/src/Riskeer.ClosingStructures.Forms/PropertyClasses/ClosingStructuresInputContextProperties.cs	(.../ClosingStructuresInputContextProperties.cs)	(revision d3b94aacb873473ebe92d56b4e48341bf4b26412)
+++ Riskeer/ClosingStructures/src/Riskeer.ClosingStructures.Forms/PropertyClasses/ClosingStructuresInputContextProperties.cs	(.../ClosingStructuresInputContextProperties.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -475,11 +475,11 @@
             schematizationIncomingFlowCategoryIndex, totalNrOfCategories)]
         [ResourcesDisplayName(typeof(RiskeerCommonFormsResources), nameof(RiskeerCommonFormsResources.Structure_DrainCoefficient_DisplayName))]
         [ResourcesDescription(typeof(RiskeerCommonFormsResources), nameof(RiskeerCommonFormsResources.Structure_DrainCoefficient_Description))]
-        public NormalDistributionProperties DrainCoefficient
+        public LogNormalDistributionProperties DrainCoefficient
         {
             get
             {
-                return new NormalDistributionProperties(
+                return new LogNormalDistributionProperties(
                     DistributionReadOnlyProperties.StandardDeviation,
                     data.WrappedData.DrainCoefficient,
                     PropertyChangeHandler);
Index: Riskeer/ClosingStructures/src/Riskeer.ClosingStructures.IO/Configurations/ClosingStructuresCalculationStochastAssigner.cs
===================================================================
diff -u -rf5cd3b2ee9b7436f606ee6bc027b795accf0549d -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/ClosingStructures/src/Riskeer.ClosingStructures.IO/Configurations/ClosingStructuresCalculationStochastAssigner.cs	(.../ClosingStructuresCalculationStochastAssigner.cs)	(revision f5cd3b2ee9b7436f606ee6bc027b795accf0549d)
+++ Riskeer/ClosingStructures/src/Riskeer.ClosingStructures.IO/Configurations/ClosingStructuresCalculationStochastAssigner.cs	(.../ClosingStructuresCalculationStochastAssigner.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -95,7 +95,7 @@
                     ClosingStructuresConfigurationSchemaIdentifiers.DrainCoefficientStochastName,
                     Configuration.DrainCoefficient,
                     i => i.DrainCoefficient,
-                    (i, d) => i.DrainCoefficient = (NormalDistribution) d);
+                    (i, d) => i.DrainCoefficient = (LogNormalDistribution) d);
 
                 yield return new StandardDeviationDefinition(
                     ConfigurationSchemaIdentifiers.ModelFactorSuperCriticalFlowStochastName,
Index: Riskeer/ClosingStructures/src/Riskeer.ClosingStructures.Service/ClosingStructuresValidationRulesRegistry.cs
===================================================================
diff -u -rf5cd3b2ee9b7436f606ee6bc027b795accf0549d -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/ClosingStructures/src/Riskeer.ClosingStructures.Service/ClosingStructuresValidationRulesRegistry.cs	(.../ClosingStructuresValidationRulesRegistry.cs)	(revision f5cd3b2ee9b7436f606ee6bc027b795accf0549d)
+++ Riskeer/ClosingStructures/src/Riskeer.ClosingStructures.Service/ClosingStructuresValidationRulesRegistry.cs	(.../ClosingStructuresValidationRulesRegistry.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -156,7 +156,7 @@
                 new NormalDistributionRule(
                     input.InsideWaterLevel,
                     ParameterNameExtractor.GetFromDisplayName(RiskeerCommonFormsResources.Structure_InsideWaterLevel_DisplayName)),
-                new NormalDistributionRule(
+                new LogNormalDistributionRule(
                     input.DrainCoefficient,
                     ParameterNameExtractor.GetFromDisplayName(RiskeerCommonFormsResources.Structure_DrainCoefficient_DisplayName)),
                 new NumericInputRule(
Index: Riskeer/ClosingStructures/test/Riskeer.ClosingStructures.Data.Test/ClosingStructuresInputTest.cs
===================================================================
diff -u -rd28e27005c5da2025e65e0544e70f89e5c08b67e -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/ClosingStructures/test/Riskeer.ClosingStructures.Data.Test/ClosingStructuresInputTest.cs	(.../ClosingStructuresInputTest.cs)	(revision d28e27005c5da2025e65e0544e70f89e5c08b67e)
+++ Riskeer/ClosingStructures/test/Riskeer.ClosingStructures.Data.Test/ClosingStructuresInputTest.cs	(.../ClosingStructuresInputTest.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -64,7 +64,7 @@
                 StandardDeviation = (RoundedDouble) 0.05
             };
 
-            var expectedDrainCoefficient = new NormalDistribution(2)
+            var expectedDrainCoefficient = new LogNormalDistribution(2)
             {
                 Mean = (RoundedDouble) 1,
                 StandardDeviation = (RoundedDouble) 0.2
@@ -126,7 +126,7 @@
 
             RoundedDouble expectedFactorStormDurationOpenStructure = input.FactorStormDurationOpenStructure;
             NormalDistribution expectedModelFactorSuperCriticalFlow = input.ModelFactorSuperCriticalFlow;
-            NormalDistribution expectedDrainCoefficient = input.DrainCoefficient;
+            LogNormalDistribution expectedDrainCoefficient = input.DrainCoefficient;
             RoundedDouble expectedDeviationWaveDirection = input.DeviationWaveDirection;
             double expectedFailureProbabilityStructureWithErosion = input.FailureProbabilityStructureWithErosion;
 
@@ -418,12 +418,12 @@
             var random = new Random(22);
             var input = new ClosingStructuresInput();
             RoundedDouble mean = random.NextRoundedDouble(0.01, 1.0);
-            var expectedDistribution = new NormalDistribution(2)
+            var expectedDistribution = new LogNormalDistribution(2)
             {
                 Mean = mean,
                 StandardDeviation = input.DrainCoefficient.StandardDeviation
             };
-            var distributionToSet = new NormalDistribution(5)
+            var distributionToSet = new LogNormalDistribution(5)
             {
                 Mean = mean,
                 StandardDeviation = random.NextRoundedDouble()
Index: Riskeer/ClosingStructures/test/Riskeer.ClosingStructures.Data.TestUtil/ClosingStructuresTestDataGenerator.cs
===================================================================
diff -u -rd28e27005c5da2025e65e0544e70f89e5c08b67e -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/ClosingStructures/test/Riskeer.ClosingStructures.Data.TestUtil/ClosingStructuresTestDataGenerator.cs	(.../ClosingStructuresTestDataGenerator.cs)	(revision d28e27005c5da2025e65e0544e70f89e5c08b67e)
+++ Riskeer/ClosingStructures/test/Riskeer.ClosingStructures.Data.TestUtil/ClosingStructuresTestDataGenerator.cs	(.../ClosingStructuresTestDataGenerator.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -52,7 +52,7 @@
                 Mean = random.NextRoundedDouble()
             };
 
-            input.DrainCoefficient = new NormalDistribution
+            input.DrainCoefficient = new LogNormalDistribution
             {
                 Mean = random.NextRoundedDouble()
             };
Index: Riskeer/ClosingStructures/test/Riskeer.ClosingStructures.IO.Test/Configurations/ClosingStructuresCalculationConfigurationExporterTest.cs
===================================================================
diff -u -rd06df6e6080508212f7ef201ab0ba0f6cb2e63f5 -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/ClosingStructures/test/Riskeer.ClosingStructures.IO.Test/Configurations/ClosingStructuresCalculationConfigurationExporterTest.cs	(.../ClosingStructuresCalculationConfigurationExporterTest.cs)	(revision d06df6e6080508212f7ef201ab0ba0f6cb2e63f5)
+++ Riskeer/ClosingStructures/test/Riskeer.ClosingStructures.IO.Test/Configurations/ClosingStructuresCalculationConfigurationExporterTest.cs	(.../ClosingStructuresCalculationConfigurationExporterTest.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -185,7 +185,7 @@
                         Mean = (RoundedDouble) 2,
                         CoefficientOfVariation = (RoundedDouble) 0.1
                     },
-                    DrainCoefficient = new NormalDistribution
+                    DrainCoefficient = new LogNormalDistribution
                     {
                         Mean = (RoundedDouble) 1.1,
                         StandardDeviation = (RoundedDouble) 0.02
Index: Riskeer/ClosingStructures/test/Riskeer.ClosingStructures.Service.Test/ClosingStructuresCalculationServiceTest.cs
===================================================================
diff -u -re3e3433c92e142f37d6a5ed931a70ad582c240bc -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/ClosingStructures/test/Riskeer.ClosingStructures.Service.Test/ClosingStructuresCalculationServiceTest.cs	(.../ClosingStructuresCalculationServiceTest.cs)	(revision e3e3433c92e142f37d6a5ed931a70ad582c240bc)
+++ Riskeer/ClosingStructures/test/Riskeer.ClosingStructures.Service.Test/ClosingStructuresCalculationServiceTest.cs	(.../ClosingStructuresCalculationServiceTest.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -213,7 +213,7 @@
                 Assert.AreEqual($"De variatiecoëfficiënt voor '{stormDuration}' moet groter zijn dan of gelijk zijn aan 0.", msgs[2]);
                 Assert.AreEqual($"De verwachtingswaarde voor '{insideWaterLevel}' moet een concreet getal zijn.", msgs[3]);
                 Assert.AreEqual($"De standaardafwijking voor '{insideWaterLevel}' moet groter zijn dan of gelijk zijn aan 0.", msgs[4]);
-                Assert.AreEqual($"De verwachtingswaarde voor '{drainCoefficient}' moet een concreet getal zijn.", msgs[5]);
+                Assert.AreEqual($"De verwachtingswaarde voor '{drainCoefficient}' moet een positief getal zijn.", msgs[5]);
                 Assert.AreEqual($"De standaardafwijking voor '{drainCoefficient}' moet groter zijn dan of gelijk zijn aan 0.", msgs[6]);
                 Assert.AreEqual($"De waarde voor '{factorStormDurationOpenStructure}' moet een concreet getal zijn.", msgs[7]);
                 Assert.AreEqual($"De verwachtingswaarde voor '{areaFlowApertures}' moet een positief getal zijn.", msgs[8]);
@@ -1157,7 +1157,6 @@
         private static void SetInvalidInputParameters(ClosingStructuresInput input, RoundedDouble value)
         {
             input.DeviationWaveDirection = RoundedDouble.NaN;
-            input.DrainCoefficient.Mean = value;
             input.FactorStormDurationOpenStructure = value;
             input.InsideWaterLevel.Mean = value;
             input.LevelCrestStructureNotClosing.Mean = value;
@@ -1170,11 +1169,12 @@
             {
                 input.AllowedLevelIncreaseStorage.Mean = RoundedDouble.NaN;
                 input.AllowedLevelIncreaseStorage.StandardDeviation = RoundedDouble.NaN;
+                input.DrainCoefficient.Mean = RoundedDouble.NaN;
+                input.DrainCoefficient.StandardDeviation = RoundedDouble.NaN;
                 input.AreaFlowApertures.Mean = RoundedDouble.NaN;
                 input.AreaFlowApertures.StandardDeviation = RoundedDouble.NaN;
                 input.CriticalOvertoppingDischarge.Mean = RoundedDouble.NaN;
                 input.CriticalOvertoppingDischarge.CoefficientOfVariation = RoundedDouble.NaN;
-                input.DrainCoefficient.StandardDeviation = RoundedDouble.NaN;
                 input.FlowWidthAtBottomProtection.Mean = RoundedDouble.NaN;
                 input.FlowWidthAtBottomProtection.StandardDeviation = RoundedDouble.NaN;
                 input.InsideWaterLevel.StandardDeviation = RoundedDouble.NaN;
@@ -1191,11 +1191,12 @@
             {
                 input.AllowedLevelIncreaseStorage.Mean = value;
                 input.AllowedLevelIncreaseStorage.StandardDeviation = value;
+                input.DrainCoefficient.Mean = value;
+                input.DrainCoefficient.StandardDeviation = value;
                 input.AreaFlowApertures.Mean = value;
                 input.AreaFlowApertures.StandardDeviation = value;
                 input.CriticalOvertoppingDischarge.Mean = value;
                 input.CriticalOvertoppingDischarge.CoefficientOfVariation = value;
-                input.DrainCoefficient.StandardDeviation = value;
                 input.FlowWidthAtBottomProtection.Mean = value;
                 input.FlowWidthAtBottomProtection.StandardDeviation = value;
                 input.InsideWaterLevel.StandardDeviation = value;
Index: Riskeer/ClosingStructures/test/Riskeer.ClosingStructures.Service.Test/ClosingStructuresValidationRulesRegistryTest.cs
===================================================================
diff -u -rd28e27005c5da2025e65e0544e70f89e5c08b67e -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/ClosingStructures/test/Riskeer.ClosingStructures.Service.Test/ClosingStructuresValidationRulesRegistryTest.cs	(.../ClosingStructuresValidationRulesRegistryTest.cs)	(revision d28e27005c5da2025e65e0544e70f89e5c08b67e)
+++ Riskeer/ClosingStructures/test/Riskeer.ClosingStructures.Service.Test/ClosingStructuresValidationRulesRegistryTest.cs	(.../ClosingStructuresValidationRulesRegistryTest.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -154,7 +154,7 @@
             Assert.IsInstanceOf<UseBreakWaterRule>(validationRules[0]);
             Assert.IsInstanceOf<VariationCoefficientLogNormalDistributionRule>(validationRules[1]);
             Assert.IsInstanceOf<NormalDistributionRule>(validationRules[2]);
-            Assert.IsInstanceOf<NormalDistributionRule>(validationRules[3]);
+            Assert.IsInstanceOf<LogNormalDistributionRule>(validationRules[3]);
             Assert.IsInstanceOf<NumericInputRule>(validationRules[4]);
             Assert.IsInstanceOf<LogNormalDistributionRule>(validationRules[5]);
             Assert.IsInstanceOf<LogNormalDistributionRule>(validationRules[6]);
Index: Riskeer/HydraRing/src/Riskeer.HydraRing.Calculation/Data/Input/Structures/StructuresClosureFloodedCulvertCalculationInput.cs
===================================================================
diff -u -r86594ccd7329d320872573a1d066fe18959d3cea -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/HydraRing/src/Riskeer.HydraRing.Calculation/Data/Input/Structures/StructuresClosureFloodedCulvertCalculationInput.cs	(.../StructuresClosureFloodedCulvertCalculationInput.cs)	(revision 86594ccd7329d320872573a1d066fe18959d3cea)
+++ Riskeer/HydraRing/src/Riskeer.HydraRing.Calculation/Data/Input/Structures/StructuresClosureFloodedCulvertCalculationInput.cs	(.../StructuresClosureFloodedCulvertCalculationInput.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -143,7 +143,7 @@
 
         private IEnumerable<HydraRingVariable> GetVariables()
         {
-            yield return new NormalHydraRingVariable(66, HydraRingDeviationType.Standard, drainCoefficientMean, drainCoefficientStandardDeviation);
+            yield return new LogNormalHydraRingVariable(66, HydraRingDeviationType.Standard, drainCoefficientMean, drainCoefficientStandardDeviation);
             yield return new LogNormalHydraRingVariable(67, HydraRingDeviationType.Standard, areaFlowAperturesMean, areaFlowAperturesStandardDeviation);
             yield return new NormalHydraRingVariable(93, HydraRingDeviationType.Standard, insideWaterLevelMean, insideWaterLevelStandardDeviation);
         }
Index: Riskeer/HydraRing/src/Riskeer.HydraRing.Calculation/Data/Input/Structures/StructuresStabilityPointFloodedCulvertLinearCalculationInput.cs
===================================================================
diff -u -r86594ccd7329d320872573a1d066fe18959d3cea -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/HydraRing/src/Riskeer.HydraRing.Calculation/Data/Input/Structures/StructuresStabilityPointFloodedCulvertLinearCalculationInput.cs	(.../StructuresStabilityPointFloodedCulvertLinearCalculationInput.cs)	(revision 86594ccd7329d320872573a1d066fe18959d3cea)
+++ Riskeer/HydraRing/src/Riskeer.HydraRing.Calculation/Data/Input/Structures/StructuresStabilityPointFloodedCulvertLinearCalculationInput.cs	(.../StructuresStabilityPointFloodedCulvertLinearCalculationInput.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -221,7 +221,7 @@
 
         private IEnumerable<HydraRingVariable> GetVariables()
         {
-            yield return new NormalHydraRingVariable(66, HydraRingDeviationType.Standard, drainCoefficientMean, drainCoefficientStandardDeviation);
+            yield return new LogNormalHydraRingVariable(66, HydraRingDeviationType.Standard, drainCoefficientMean, drainCoefficientStandardDeviation);
             yield return new LogNormalHydraRingVariable(67, HydraRingDeviationType.Standard, areaFlowAperturesMean, areaFlowAperturesStandardDeviation);
             yield return new LogNormalHydraRingVariable(80, HydraRingDeviationType.Variation, constructiveStrengthLinearLoadModelMean, constructiveStrengthLinearLoadModelVariation);
             yield return new LogNormalHydraRingVariable(83, HydraRingDeviationType.Variation, stabilityLinearLoadModelMean, stabilityLinearLoadModelVariation);
Index: Riskeer/HydraRing/src/Riskeer.HydraRing.Calculation/Data/Input/Structures/StructuresStabilityPointFloodedCulvertQuadraticCalculationInput.cs
===================================================================
diff -u -r86594ccd7329d320872573a1d066fe18959d3cea -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/HydraRing/src/Riskeer.HydraRing.Calculation/Data/Input/Structures/StructuresStabilityPointFloodedCulvertQuadraticCalculationInput.cs	(.../StructuresStabilityPointFloodedCulvertQuadraticCalculationInput.cs)	(revision 86594ccd7329d320872573a1d066fe18959d3cea)
+++ Riskeer/HydraRing/src/Riskeer.HydraRing.Calculation/Data/Input/Structures/StructuresStabilityPointFloodedCulvertQuadraticCalculationInput.cs	(.../StructuresStabilityPointFloodedCulvertQuadraticCalculationInput.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -221,7 +221,7 @@
 
         private IEnumerable<HydraRingVariable> GetVariables()
         {
-            yield return new NormalHydraRingVariable(66, HydraRingDeviationType.Standard, drainCoefficientMean, drainCoefficientStandardDeviation);
+            yield return new LogNormalHydraRingVariable(66, HydraRingDeviationType.Standard, drainCoefficientMean, drainCoefficientStandardDeviation);
             yield return new LogNormalHydraRingVariable(67, HydraRingDeviationType.Standard, areaFlowAperturesMean, areaFlowAperturesStandardDeviation);
             yield return new LogNormalHydraRingVariable(81, HydraRingDeviationType.Variation, constructiveStrengthQuadraticLoadModelMean, constructiveStrengthQuadraticLoadModelVariation);
             yield return new LogNormalHydraRingVariable(84, HydraRingDeviationType.Variation, stabilityQuadraticLoadModelMean, stabilityQuadraticLoadModelVariation);
Index: Riskeer/HydraRing/test/Riskeer.HydraRing.Calculation.Test/Data/Input/Structures/StructuresClosureFloodedCulvertCalculationInputTest.cs
===================================================================
diff -u -r86594ccd7329d320872573a1d066fe18959d3cea -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/HydraRing/test/Riskeer.HydraRing.Calculation.Test/Data/Input/Structures/StructuresClosureFloodedCulvertCalculationInputTest.cs	(.../StructuresClosureFloodedCulvertCalculationInputTest.cs)	(revision 86594ccd7329d320872573a1d066fe18959d3cea)
+++ Riskeer/HydraRing/test/Riskeer.HydraRing.Calculation.Test/Data/Input/Structures/StructuresClosureFloodedCulvertCalculationInputTest.cs	(.../StructuresClosureFloodedCulvertCalculationInputTest.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -131,7 +131,7 @@
         {
             yield return new DeterministicHydraRingVariable(58, 1.1);
             yield return new DeterministicHydraRingVariable(63, 2.2);
-            yield return new NormalHydraRingVariable(66, HydraRingDeviationType.Standard, 21.1, 22.2);
+            yield return new LogNormalHydraRingVariable(66, HydraRingDeviationType.Standard, 21.1, 22.2);
             yield return new LogNormalHydraRingVariable(67, HydraRingDeviationType.Standard, 23.3, 24.4);
             yield return new DeterministicHydraRingVariable(68, 3.3);
             yield return new DeterministicHydraRingVariable(69, 4.4);
Index: Riskeer/HydraRing/test/Riskeer.HydraRing.Calculation.Test/Data/Input/Structures/StructuresStabilityPointFloodedCulvertLinearCalculationInputTest.cs
===================================================================
diff -u -r86594ccd7329d320872573a1d066fe18959d3cea -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/HydraRing/test/Riskeer.HydraRing.Calculation.Test/Data/Input/Structures/StructuresStabilityPointFloodedCulvertLinearCalculationInputTest.cs	(.../StructuresStabilityPointFloodedCulvertLinearCalculationInputTest.cs)	(revision 86594ccd7329d320872573a1d066fe18959d3cea)
+++ Riskeer/HydraRing/test/Riskeer.HydraRing.Calculation.Test/Data/Input/Structures/StructuresStabilityPointFloodedCulvertLinearCalculationInputTest.cs	(.../StructuresStabilityPointFloodedCulvertLinearCalculationInputTest.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -194,7 +194,7 @@
             yield return new DeterministicHydraRingVariable(61, 5.5);
             yield return new DeterministicHydraRingVariable(63, 6.6);
             yield return new NormalHydraRingVariable(65, HydraRingDeviationType.Standard, 7.7, 8.8);
-            yield return new NormalHydraRingVariable(66, HydraRingDeviationType.Standard, 52.52, 53.53);
+            yield return new LogNormalHydraRingVariable(66, HydraRingDeviationType.Standard, 52.52, 53.53);
             yield return new LogNormalHydraRingVariable(67, HydraRingDeviationType.Standard, 54.54, 55.55);
             yield return new LogNormalHydraRingVariable(80, HydraRingDeviationType.Variation, 56.56, 57.57);
             yield return new NormalHydraRingVariable(82, HydraRingDeviationType.Standard, 9.9, 10.10);
Index: Riskeer/HydraRing/test/Riskeer.HydraRing.Calculation.Test/Data/Input/Structures/StructuresStabilityPointFloodedCulvertQuadraticCalculationInputTest.cs
===================================================================
diff -u -r86594ccd7329d320872573a1d066fe18959d3cea -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/HydraRing/test/Riskeer.HydraRing.Calculation.Test/Data/Input/Structures/StructuresStabilityPointFloodedCulvertQuadraticCalculationInputTest.cs	(.../StructuresStabilityPointFloodedCulvertQuadraticCalculationInputTest.cs)	(revision 86594ccd7329d320872573a1d066fe18959d3cea)
+++ Riskeer/HydraRing/test/Riskeer.HydraRing.Calculation.Test/Data/Input/Structures/StructuresStabilityPointFloodedCulvertQuadraticCalculationInputTest.cs	(.../StructuresStabilityPointFloodedCulvertQuadraticCalculationInputTest.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -194,7 +194,7 @@
             yield return new DeterministicHydraRingVariable(61, 5.5);
             yield return new DeterministicHydraRingVariable(63, 6.6);
             yield return new NormalHydraRingVariable(65, HydraRingDeviationType.Standard, 7.7, 8.8);
-            yield return new NormalHydraRingVariable(66, HydraRingDeviationType.Standard, 52.52, 53.53);
+            yield return new LogNormalHydraRingVariable(66, HydraRingDeviationType.Standard, 52.52, 53.53);
             yield return new LogNormalHydraRingVariable(67, HydraRingDeviationType.Standard, 54.54, 55.55);
             yield return new LogNormalHydraRingVariable(81, HydraRingDeviationType.Variation, 56.56, 57.57);
             yield return new NormalHydraRingVariable(82, HydraRingDeviationType.Standard, 9.9, 10.10);
Index: Riskeer/HydraRing/test/Riskeer.HydraRing.Calculation.Test/Integration/HydraRingConfigurationServiceIntegrationTest.cs
===================================================================
diff -u -rb2a468f9ee8aae737da8f7f233ad8405dc3bd707 -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/HydraRing/test/Riskeer.HydraRing.Calculation.Test/Integration/HydraRingConfigurationServiceIntegrationTest.cs	(.../HydraRingConfigurationServiceIntegrationTest.cs)	(revision b2a468f9ee8aae737da8f7f233ad8405dc3bd707)
+++ Riskeer/HydraRing/test/Riskeer.HydraRing.Calculation.Test/Integration/HydraRingConfigurationServiceIntegrationTest.cs	(.../HydraRingConfigurationServiceIntegrationTest.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -1206,7 +1206,7 @@
                                             "DELETE FROM [VariableDatas];" + Environment.NewLine +
                                             "INSERT INTO [VariableDatas] VALUES (1, 111, 1, 1, 58, 1.1, 0, 0, NULL, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
                                             "INSERT INTO [VariableDatas] VALUES (1, 111, 1, 1, 63, 2.2, 0, 0, NULL, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
-                                            "INSERT INTO [VariableDatas] VALUES (1, 111, 1, 1, 66, 0, 2, 21.1, 22.2, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
+                                            "INSERT INTO [VariableDatas] VALUES (1, 111, 1, 1, 66, 0, 4, 21.1, 22.2, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
                                             "INSERT INTO [VariableDatas] VALUES (1, 111, 1, 1, 67, 0, 4, 23.3, 24.4, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
                                             "INSERT INTO [VariableDatas] VALUES (1, 111, 1, 1, 68, 3.3, 0, 0, NULL, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
                                             "INSERT INTO [VariableDatas] VALUES (1, 111, 1, 1, 69, 4.4, 0, 0, NULL, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
@@ -1631,7 +1631,7 @@
                                             "INSERT INTO [VariableDatas] VALUES (1, 112, 1, 1, 61, 5.5, 0, 0, NULL, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
                                             "INSERT INTO [VariableDatas] VALUES (1, 112, 1, 1, 63, 6.6, 0, 0, NULL, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
                                             "INSERT INTO [VariableDatas] VALUES (1, 112, 1, 1, 65, 0, 2, 7.7, 8.8, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
-                                            "INSERT INTO [VariableDatas] VALUES (1, 112, 1, 1, 66, 0, 2, 52.2, 53.3, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
+                                            "INSERT INTO [VariableDatas] VALUES (1, 112, 1, 1, 66, 0, 4, 52.2, 53.3, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
                                             "INSERT INTO [VariableDatas] VALUES (1, 112, 1, 1, 67, 0, 4, 54.4, 55.5, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
                                             "INSERT INTO [VariableDatas] VALUES (1, 112, 1, 1, 80, 0, 4, 56.6, NULL, NULL, NULL, 0, 57.7, 999999);" + Environment.NewLine +
                                             "INSERT INTO [VariableDatas] VALUES (1, 112, 1, 1, 82, 0, 2, 9.9, 10, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
@@ -1799,7 +1799,7 @@
                                             "INSERT INTO [VariableDatas] VALUES (1, 112, 1, 1, 61, 5.5, 0, 0, NULL, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
                                             "INSERT INTO [VariableDatas] VALUES (1, 112, 1, 1, 63, 6.6, 0, 0, NULL, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
                                             "INSERT INTO [VariableDatas] VALUES (1, 112, 1, 1, 65, 0, 2, 7.7, 8.8, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
-                                            "INSERT INTO [VariableDatas] VALUES (1, 112, 1, 1, 66, 0, 2, 52.2, 53.3, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
+                                            "INSERT INTO [VariableDatas] VALUES (1, 112, 1, 1, 66, 0, 4, 52.2, 53.3, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
                                             "INSERT INTO [VariableDatas] VALUES (1, 112, 1, 1, 67, 0, 4, 54.4, 55.5, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
                                             "INSERT INTO [VariableDatas] VALUES (1, 112, 1, 1, 81, 0, 4, 56.6, NULL, NULL, NULL, 0, 57.7, 999999);" + Environment.NewLine +
                                             "INSERT INTO [VariableDatas] VALUES (1, 112, 1, 1, 82, 0, 2, 9.9, 10, NULL, NULL, 1, 0, 999999);" + Environment.NewLine +
Index: Riskeer/StabilityPointStructures/src/Riskeer.StabilityPointStructures.Data/StabilityPointStructuresInput.cs
===================================================================
diff -u -r8293671e0387359eae22d20c0d37c34fed11ce55 -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/StabilityPointStructures/src/Riskeer.StabilityPointStructures.Data/StabilityPointStructuresInput.cs	(.../StabilityPointStructuresInput.cs)	(revision 8293671e0387359eae22d20c0d37c34fed11ce55)
+++ Riskeer/StabilityPointStructures/src/Riskeer.StabilityPointStructures.Data/StabilityPointStructuresInput.cs	(.../StabilityPointStructuresInput.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -43,7 +43,7 @@
 
         private NormalDistribution insideWaterLevelFailureConstruction;
         private NormalDistribution insideWaterLevel;
-        private NormalDistribution drainCoefficient;
+        private LogNormalDistribution drainCoefficient;
         private NormalDistribution levelCrestStructure;
         private NormalDistribution thresholdHeightOpenWeir;
         private LogNormalDistribution areaFlowApertures;
@@ -76,7 +76,7 @@
             evaluationLevel = new RoundedDouble(2);
             verticalDistance = new RoundedDouble(verticalDistanceNumberOfDecimals);
 
-            drainCoefficient = new NormalDistribution(2)
+            drainCoefficient = new LogNormalDistribution(2)
             {
                 Mean = (RoundedDouble) 1.0,
                 StandardDeviation = (RoundedDouble) 0.20
@@ -178,7 +178,7 @@
 
             clone.insideWaterLevelFailureConstruction = (NormalDistribution) InsideWaterLevelFailureConstruction.Clone();
             clone.insideWaterLevel = (NormalDistribution) InsideWaterLevel.Clone();
-            clone.drainCoefficient = (NormalDistribution) DrainCoefficient.Clone();
+            clone.drainCoefficient = (LogNormalDistribution) DrainCoefficient.Clone();
             clone.levelCrestStructure = (NormalDistribution) LevelCrestStructure.Clone();
             clone.thresholdHeightOpenWeir = (NormalDistribution) ThresholdHeightOpenWeir.Clone();
             clone.areaFlowApertures = (LogNormalDistribution) AreaFlowApertures.Clone();
@@ -380,7 +380,7 @@
         /// Gets or sets the drain coefficient.
         /// </summary>
         /// <remarks>Only sets the mean.</remarks>
-        public NormalDistribution DrainCoefficient
+        public LogNormalDistribution DrainCoefficient
         {
             get
             {
Index: Riskeer/StabilityPointStructures/src/Riskeer.StabilityPointStructures.Forms/PropertyClasses/StabilityPointStructuresInputContextProperties.cs
===================================================================
diff -u -r9947ac1b187e45d4432c7f121d14345f0fcb29ac -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/StabilityPointStructures/src/Riskeer.StabilityPointStructures.Forms/PropertyClasses/StabilityPointStructuresInputContextProperties.cs	(.../StabilityPointStructuresInputContextProperties.cs)	(revision 9947ac1b187e45d4432c7f121d14345f0fcb29ac)
+++ Riskeer/StabilityPointStructures/src/Riskeer.StabilityPointStructures.Forms/PropertyClasses/StabilityPointStructuresInputContextProperties.cs	(.../StabilityPointStructuresInputContextProperties.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -561,11 +561,11 @@
             schematizationIncomingFlowCategoryIndex, totalNrOfCategories)]
         [ResourcesDisplayName(typeof(RiskeerCommonFormsResources), nameof(RiskeerCommonFormsResources.Structure_DrainCoefficient_DisplayName))]
         [ResourcesDescription(typeof(RiskeerCommonFormsResources), nameof(RiskeerCommonFormsResources.Structure_DrainCoefficient_Description))]
-        public NormalDistributionProperties DrainCoefficient
+        public LogNormalDistributionProperties DrainCoefficient
         {
             get
             {
-                return new NormalDistributionProperties(
+                return new LogNormalDistributionProperties(
                     DistributionReadOnlyProperties.StandardDeviation,
                     data.WrappedData.DrainCoefficient,
                     PropertyChangeHandler);
Index: Riskeer/StabilityPointStructures/src/Riskeer.StabilityPointStructures.IO/Configurations/StabilityPointStructuresCalculationStochastAssigner.cs
===================================================================
diff -u -r86594ccd7329d320872573a1d066fe18959d3cea -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/StabilityPointStructures/src/Riskeer.StabilityPointStructures.IO/Configurations/StabilityPointStructuresCalculationStochastAssigner.cs	(.../StabilityPointStructuresCalculationStochastAssigner.cs)	(revision 86594ccd7329d320872573a1d066fe18959d3cea)
+++ Riskeer/StabilityPointStructures/src/Riskeer.StabilityPointStructures.IO/Configurations/StabilityPointStructuresCalculationStochastAssigner.cs	(.../StabilityPointStructuresCalculationStochastAssigner.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -110,7 +110,7 @@
                     StabilityPointStructuresConfigurationSchemaIdentifiers.DrainCoefficientStochastName,
                     Configuration.DrainCoefficient,
                     i => i.DrainCoefficient,
-                    (i, d) => i.DrainCoefficient = (NormalDistribution) d);
+                    (i, d) => i.DrainCoefficient = (LogNormalDistribution) d);
             }
         }
 
Index: Riskeer/StabilityPointStructures/src/Riskeer.StabilityPointStructures.Service/StabilityPointStructuresValidationRulesRegistry.cs
===================================================================
diff -u -rbab6e2f55474e23481bf4f119b1cd356c13c4be1 -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/StabilityPointStructures/src/Riskeer.StabilityPointStructures.Service/StabilityPointStructuresValidationRulesRegistry.cs	(.../StabilityPointStructuresValidationRulesRegistry.cs)	(revision bab6e2f55474e23481bf4f119b1cd356c13c4be1)
+++ Riskeer/StabilityPointStructures/src/Riskeer.StabilityPointStructures.Service/StabilityPointStructuresValidationRulesRegistry.cs	(.../StabilityPointStructuresValidationRulesRegistry.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -294,7 +294,7 @@
                 new VariationCoefficientNormalDistributionRule(
                     input.FlowVelocityStructureClosable,
                     ParameterNameExtractor.GetFromDisplayName(RiskeerStabilityPointStructuresFormsResources.Structure_FlowVelocityStructureClosable_DisplayName)),
-                new NormalDistributionRule(
+                new LogNormalDistributionRule(
                     input.DrainCoefficient,
                     ParameterNameExtractor.GetFromDisplayName(RiskeerCommonFormsResources.Structure_DrainCoefficient_DisplayName)),
                 new NumericInputRule(
@@ -371,7 +371,7 @@
                 new VariationCoefficientNormalDistributionRule(
                     input.FlowVelocityStructureClosable,
                     ParameterNameExtractor.GetFromDisplayName(RiskeerStabilityPointStructuresFormsResources.Structure_FlowVelocityStructureClosable_DisplayName)),
-                new NormalDistributionRule(
+                new LogNormalDistributionRule(
                     input.DrainCoefficient,
                     ParameterNameExtractor.GetFromDisplayName(RiskeerCommonFormsResources.Structure_DrainCoefficient_DisplayName)),
                 new NumericInputRule(
Index: Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Data.Test/StabilityPointStructuresInputTest.cs
===================================================================
diff -u -r86594ccd7329d320872573a1d066fe18959d3cea -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Data.Test/StabilityPointStructuresInputTest.cs	(.../StabilityPointStructuresInputTest.cs)	(revision 86594ccd7329d320872573a1d066fe18959d3cea)
+++ Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Data.Test/StabilityPointStructuresInputTest.cs	(.../StabilityPointStructuresInputTest.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -59,7 +59,7 @@
                 StandardDeviation = RoundedDouble.NaN
             };
 
-            var expectedDrainCoefficient = new NormalDistribution(2)
+            var expectedDrainCoefficient = new LogNormalDistribution(2)
             {
                 Mean = (RoundedDouble) 1,
                 StandardDeviation = (RoundedDouble) 0.2
@@ -192,7 +192,7 @@
             };
 
             RoundedDouble expectedVolumicWeightWater = input.VolumicWeightWater;
-            NormalDistribution expectedDrainCoefficient = input.DrainCoefficient;
+            LogNormalDistribution expectedDrainCoefficient = input.DrainCoefficient;
             RoundedDouble expectedFactorStormDurationOpenStructure = input.FactorStormDurationOpenStructure;
             double expectedFailureProbabilityStructureWithErosion = input.FailureProbabilityStructureWithErosion;
 
@@ -544,12 +544,12 @@
             var input = new StabilityPointStructuresInput();
             var mean = (RoundedDouble) (0.01 + random.NextDouble());
             var standardDeviation = (RoundedDouble) (0.01 + random.NextDouble());
-            var expectedDistribution = new NormalDistribution(2)
+            var expectedDistribution = new LogNormalDistribution(2)
             {
                 Mean = mean,
                 StandardDeviation = input.DrainCoefficient.StandardDeviation
             };
-            var distributionToSet = new NormalDistribution(5)
+            var distributionToSet = new LogNormalDistribution(5)
             {
                 Mean = mean,
                 StandardDeviation = standardDeviation
Index: Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Data.TestUtil/StabilityPointStructuresTestDataGenerator.cs
===================================================================
diff -u -r86594ccd7329d320872573a1d066fe18959d3cea -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Data.TestUtil/StabilityPointStructuresTestDataGenerator.cs	(.../StabilityPointStructuresTestDataGenerator.cs)	(revision 86594ccd7329d320872573a1d066fe18959d3cea)
+++ Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Data.TestUtil/StabilityPointStructuresTestDataGenerator.cs	(.../StabilityPointStructuresTestDataGenerator.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -53,7 +53,7 @@
                 StandardDeviation = random.NextRoundedDouble()
             };
 
-            input.DrainCoefficient = new NormalDistribution
+            input.DrainCoefficient = new LogNormalDistribution
             {
                 Mean = random.NextRoundedDouble()
             };
Index: Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.IO.Test/Configurations/StabilityPointStructuresCalculationConfigurationExporterTest.cs
===================================================================
diff -u -rd06df6e6080508212f7ef201ab0ba0f6cb2e63f5 -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.IO.Test/Configurations/StabilityPointStructuresCalculationConfigurationExporterTest.cs	(.../StabilityPointStructuresCalculationConfigurationExporterTest.cs)	(revision d06df6e6080508212f7ef201ab0ba0f6cb2e63f5)
+++ Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.IO.Test/Configurations/StabilityPointStructuresCalculationConfigurationExporterTest.cs	(.../StabilityPointStructuresCalculationConfigurationExporterTest.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -252,7 +252,7 @@
                         Mean = (RoundedDouble) 2,
                         CoefficientOfVariation = (RoundedDouble) 0.1
                     },
-                    DrainCoefficient = new NormalDistribution
+                    DrainCoefficient = new LogNormalDistribution
                     {
                         Mean = (RoundedDouble) 0.1
                     },
Index: Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Service.Test/StabilityPointStructuresCalculationServiceTest.cs
===================================================================
diff -u -rb0021e52ef17e3101d6e7089e3052ceb4621f3fe -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Service.Test/StabilityPointStructuresCalculationServiceTest.cs	(.../StabilityPointStructuresCalculationServiceTest.cs)	(revision b0021e52ef17e3101d6e7089e3052ceb4621f3fe)
+++ Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Service.Test/StabilityPointStructuresCalculationServiceTest.cs	(.../StabilityPointStructuresCalculationServiceTest.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -318,7 +318,7 @@
                 Assert.AreEqual($"De standaardafwijking voor '{insideWaterLevelFailureConstructionParameterName}' moet groter zijn dan of gelijk zijn aan 0.", msgs[7]);
                 Assert.AreEqual($"De verwachtingswaarde voor '{flowVelocityStructureClosableParameterName}' moet een concreet getal zijn.", msgs[8]);
                 Assert.AreEqual($"De variatiecoëfficiënt voor '{flowVelocityStructureClosableParameterName}' moet groter zijn dan of gelijk zijn aan 0.", msgs[9]);
-                Assert.AreEqual($"De verwachtingswaarde voor '{drainCoefficientParameterName}' moet een concreet getal zijn.", msgs[10]);
+                Assert.AreEqual($"De verwachtingswaarde voor '{drainCoefficientParameterName}' moet een positief getal zijn.", msgs[10]);
                 Assert.AreEqual($"De standaardafwijking voor '{drainCoefficientParameterName}' moet groter zijn dan of gelijk zijn aan 0.", msgs[11]);
                 Assert.AreEqual($"De waarde voor '{factorStormDurationOpenStructureParameterName}' moet een concreet getal zijn.", msgs[12]);
                 Assert.AreEqual($"De waarde voor '{structureNormalOrientationParameterName}' moet een concreet getal zijn.", msgs[13]);
@@ -399,7 +399,7 @@
                 Assert.AreEqual($"De standaardafwijking voor '{insideWaterLevelFailureConstructionParameterName}' moet groter zijn dan of gelijk zijn aan 0.", msgs[7]);
                 Assert.AreEqual($"De verwachtingswaarde voor '{flowVelocityStructureClosableParameterName}' moet een concreet getal zijn.", msgs[8]);
                 Assert.AreEqual($"De variatiecoëfficiënt voor '{flowVelocityStructureClosableParameterName}' moet groter zijn dan of gelijk zijn aan 0.", msgs[9]);
-                Assert.AreEqual($"De verwachtingswaarde voor '{drainCoefficientParameterName}' moet een concreet getal zijn.", msgs[10]);
+                Assert.AreEqual($"De verwachtingswaarde voor '{drainCoefficientParameterName}' moet een positief getal zijn.", msgs[10]);
                 Assert.AreEqual($"De standaardafwijking voor '{drainCoefficientParameterName}' moet groter zijn dan of gelijk zijn aan 0.", msgs[11]);
                 Assert.AreEqual($"De waarde voor '{factorStormDurationOpenStructureParameterName}' moet een concreet getal zijn.", msgs[12]);
                 Assert.AreEqual($"De waarde voor '{structureNormalOrientationParameterName}' moet een concreet getal zijn.", msgs[13]);
@@ -1876,7 +1876,6 @@
             input.InsideWaterLevelFailureConstruction.Mean = value;
             input.InsideWaterLevel.Mean = value;
             input.FlowVelocityStructureClosable.Mean = value;
-            input.DrainCoefficient.Mean = value;
             input.LevelCrestStructure.Mean = value;
             input.ThresholdHeightOpenWeir.Mean = value;
             input.ShipMass.Mean = value;
@@ -1933,6 +1932,7 @@
                 input.InsideWaterLevel.StandardDeviation = value;
                 input.StormDuration.CoefficientOfVariation = value;
                 input.FlowVelocityStructureClosable.CoefficientOfVariation = value;
+                input.DrainCoefficient.Mean = value;
                 input.DrainCoefficient.StandardDeviation = value;
                 input.LevelCrestStructure.StandardDeviation = value;
                 input.ThresholdHeightOpenWeir.StandardDeviation = value;
Index: Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Service.Test/StabilityPointStructuresValidationRulesRegistryTest.cs
===================================================================
diff -u -r86594ccd7329d320872573a1d066fe18959d3cea -r7ab3bcc7c73d63e46759c65e47b72ea25ae020e0
--- Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Service.Test/StabilityPointStructuresValidationRulesRegistryTest.cs	(.../StabilityPointStructuresValidationRulesRegistryTest.cs)	(revision 86594ccd7329d320872573a1d066fe18959d3cea)
+++ Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Service.Test/StabilityPointStructuresValidationRulesRegistryTest.cs	(.../StabilityPointStructuresValidationRulesRegistryTest.cs)	(revision 7ab3bcc7c73d63e46759c65e47b72ea25ae020e0)
@@ -165,7 +165,7 @@
             Assert.IsInstanceOf<NormalDistributionRule>(validationRules[3]);
             Assert.IsInstanceOf<NormalDistributionRule>(validationRules[4]);
             Assert.IsInstanceOf<VariationCoefficientNormalDistributionRule>(validationRules[5]);
-            Assert.IsInstanceOf<NormalDistributionRule>(validationRules[6]);
+            Assert.IsInstanceOf<LogNormalDistributionRule>(validationRules[6]);
             Assert.IsInstanceOf<NumericInputRule>(validationRules[7]);
             Assert.IsInstanceOf<NumericInputRule>(validationRules[8]);
             Assert.IsInstanceOf<LogNormalDistributionRule>(validationRules[9]);