Index: Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.Service.Test/ClosingStructuresCalculationServiceTest.cs
===================================================================
diff -u -rf70611f9af51a6ffc8cb4d8d28d1ea806104937b -rad4a977be1c898ddc8bebd75252212538f77035f
--- Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.Service.Test/ClosingStructuresCalculationServiceTest.cs	(.../ClosingStructuresCalculationServiceTest.cs)	(revision f70611f9af51a6ffc8cb4d8d28d1ea806104937b)
+++ Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.Service.Test/ClosingStructuresCalculationServiceTest.cs	(.../ClosingStructuresCalculationServiceTest.cs)	(revision ad4a977be1c898ddc8bebd75252212538f77035f)
@@ -53,6 +53,7 @@
         private static readonly string validDataFilepath = Path.Combine(testDataPath, "HRD dutch coast south.sqlite");
 
         #region Parameter name mappings
+
         private static readonly Dictionary<string, string> parameterNames = new Dictionary<string, string>()
         {
             {
@@ -104,6 +105,7 @@
                 "widthFlowApertures", "breedte van doorstroomopening"
             }
         };
+
         #endregion
 
         [Test]
@@ -207,8 +209,9 @@
                 }
             };
 
-            // Call
             bool isValid = false;
+
+            // Call
             Action call = () => isValid = ClosingStructuresCalculationService.Validate(calculation, assessmentSectionStub);
 
             // Assert
@@ -245,58 +248,8 @@
                 Name = name
             };
 
-            calculation.InputParameters.DeviationWaveDirection = RoundedDouble.NaN; 
-            calculation.InputParameters.FactorStormDurationOpenStructure = (RoundedDouble) value;
-            calculation.InputParameters.ModelFactorSuperCriticalFlow.Mean = (RoundedDouble) value;
-            calculation.InputParameters.StructureNormalOrientation = RoundedDouble.NaN;
+            SetInvalidInputParameters(calculation, (RoundedDouble) value);
 
-            calculation.InputParameters.LevelCrestStructureNotClosing.Mean = (RoundedDouble) value;
-            calculation.InputParameters.WidthFlowApertures.Mean = (RoundedDouble) value;
-
-            if (double.IsNegativeInfinity(value))
-            {
-                calculation.InputParameters.StormDuration.Mean = RoundedDouble.NaN;
-                calculation.InputParameters.StormDuration.CoefficientOfVariation = RoundedDouble.NaN;
-                calculation.InputParameters.ModelFactorSuperCriticalFlow.StandardDeviation = RoundedDouble.NaN;
-                calculation.InputParameters.LevelCrestStructureNotClosing.StandardDeviation = RoundedDouble.NaN;
-
-                calculation.InputParameters.AllowedLevelIncreaseStorage.Mean = RoundedDouble.NaN;
-                calculation.InputParameters.AllowedLevelIncreaseStorage.StandardDeviation = RoundedDouble.NaN;
-
-                calculation.InputParameters.StorageStructureArea.Mean = RoundedDouble.NaN;
-                calculation.InputParameters.StorageStructureArea.CoefficientOfVariation = RoundedDouble.NaN;
-
-                calculation.InputParameters.FlowWidthAtBottomProtection.Mean = RoundedDouble.NaN;
-                calculation.InputParameters.FlowWidthAtBottomProtection.StandardDeviation = RoundedDouble.NaN;
-
-                calculation.InputParameters.CriticalOvertoppingDischarge.Mean = RoundedDouble.NaN;
-                calculation.InputParameters.CriticalOvertoppingDischarge.CoefficientOfVariation = RoundedDouble.NaN;
-
-                calculation.InputParameters.WidthFlowApertures.CoefficientOfVariation = RoundedDouble.NaN;
-            }
-            else
-            {
-                calculation.InputParameters.StormDuration.Mean = (RoundedDouble) value;
-                calculation.InputParameters.StormDuration.CoefficientOfVariation = (RoundedDouble) value;
-
-                calculation.InputParameters.ModelFactorSuperCriticalFlow.StandardDeviation = (RoundedDouble) value;
-                calculation.InputParameters.LevelCrestStructureNotClosing.StandardDeviation = (RoundedDouble) value;
-
-                calculation.InputParameters.AllowedLevelIncreaseStorage.Mean = (RoundedDouble) value;
-                calculation.InputParameters.AllowedLevelIncreaseStorage.StandardDeviation = (RoundedDouble) value;
-
-                calculation.InputParameters.StorageStructureArea.Mean = (RoundedDouble) value;
-                calculation.InputParameters.StorageStructureArea.CoefficientOfVariation = (RoundedDouble) value;
-
-                calculation.InputParameters.FlowWidthAtBottomProtection.Mean = (RoundedDouble) value;
-                calculation.InputParameters.FlowWidthAtBottomProtection.StandardDeviation = (RoundedDouble) value;
-
-                calculation.InputParameters.CriticalOvertoppingDischarge.Mean = (RoundedDouble) value;
-                calculation.InputParameters.CriticalOvertoppingDischarge.CoefficientOfVariation = (RoundedDouble) value;
-
-                calculation.InputParameters.WidthFlowApertures.CoefficientOfVariation = (RoundedDouble) value;
-            }
-
             // Call 
             bool isValid = false;
             Action call = () => isValid = ClosingStructuresCalculationService.Validate(calculation, assessmentSectionStub);
@@ -334,6 +287,68 @@
         }
 
         [Test]
+        [TestCase(double.NaN)]
+        [TestCase(double.PositiveInfinity)]
+        [TestCase(double.NegativeInfinity)]
+        public void Validate_InvalidLowSillCalculation_LogsErrorAndReturnsFalse(double value)
+        {
+            // Setup 
+            var mockRepository = new MockRepository();
+            var assessmentSectionStub = CreateAssessmentSectionStub(new ClosingStructuresFailureMechanism(), mockRepository);
+            mockRepository.ReplayAll();
+
+            assessmentSectionStub.HydraulicBoundaryDatabase.FilePath = Path.Combine(testDataPath, "HRD dutch coast south.sqlite");
+
+            const string name = "<very nice name>";
+
+            var calculation = new TestClosingStructuresCalculation()
+            {
+                Name = name,
+                InputParameters =
+                {
+                    InflowModelType = ClosingStructureInflowModelType.LowSill
+                }
+            };
+            SetInvalidInputParameters(calculation, (RoundedDouble) value);
+
+            bool isValid = false;
+
+            // Call 
+            Action call = () => isValid = ClosingStructuresCalculationService.Validate(calculation, assessmentSectionStub);
+
+            // Assert
+            TestHelper.AssertLogMessages(call, messages =>
+            {
+                var msgs = messages.ToArray();
+                Assert.AreEqual(21, msgs.Length);
+                StringAssert.StartsWith(string.Format("Validatie van '{0}' gestart om: ", name), msgs[0]);
+                StringAssert.StartsWith(string.Format("Validatie mislukt: De verwachtingswaarde voor '{0}' moet een positief getal zijn.", parameterNames["stormDuration"]), msgs[1]);
+                StringAssert.StartsWith(string.Format("Validatie mislukt: De variatiecoëfficient voor '{0}' moet groter zijn dan of gelijk zijn aan 0.", parameterNames["stormDuration"]), msgs[2]);
+                StringAssert.StartsWith(string.Format("Validatie mislukt: De verwachtingswaarde voor '{0}' moet een concreet getal zijn.", parameterNames["insideWaterLevel"]), msgs[3]);
+                StringAssert.StartsWith(string.Format("Validatie mislukt: De standaard afwijking voor '{0}' moet groter zijn dan of gelijk zijn aan 0.", parameterNames["insideWaterLevel"]), msgs[4]);
+                StringAssert.StartsWith(string.Format("Validatie mislukt: De verwachtingswaarde voor '{0}' moet een concreet getal zijn.", parameterNames["modelFactorSuperCriticalFlow"]), msgs[5]);
+                StringAssert.StartsWith(string.Format("Validatie mislukt: De standaard afwijking voor '{0}' moet groter zijn dan of gelijk zijn aan 0.", parameterNames["modelFactorSuperCriticalFlow"]), msgs[6]);
+                StringAssert.StartsWith(string.Format("Validatie mislukt: Er is geen concreet getal ingevoerd voor '{0}'.", parameterNames["factorStormDurationOpenStructure"]), msgs[7]);
+                StringAssert.StartsWith(string.Format("Validatie mislukt: De verwachtingswaarde voor '{0}' moet een concreet getal zijn.", parameterNames["widthFlowApertures"]), msgs[8]);
+                StringAssert.StartsWith(string.Format("Validatie mislukt: De variatiecoëfficient voor '{0}' moet groter zijn dan of gelijk zijn aan 0.", parameterNames["widthFlowApertures"]), msgs[9]);
+                StringAssert.StartsWith(string.Format("Validatie mislukt: De verwachtingswaarde voor '{0}' moet een positief getal zijn.", parameterNames["flowWidthAtBottomProtection"]), msgs[10]);
+                StringAssert.StartsWith(string.Format("Validatie mislukt: De standaard afwijking voor '{0}' moet groter zijn dan of gelijk zijn aan 0.", parameterNames["flowWidthAtBottomProtection"]), msgs[11]);
+                StringAssert.StartsWith(string.Format("Validatie mislukt: De verwachtingswaarde voor '{0}' moet een positief getal zijn.", parameterNames["storageStructureArea"]), msgs[12]);
+                StringAssert.StartsWith(string.Format("Validatie mislukt: De variatiecoëfficient voor '{0}' moet groter zijn dan of gelijk zijn aan 0.", parameterNames["storageStructureArea"]), msgs[13]);
+                StringAssert.StartsWith(string.Format("Validatie mislukt: De verwachtingswaarde voor '{0}' moet een positief getal zijn.", parameterNames["allowedLevelIncreaseStorage"]), msgs[14]);
+                StringAssert.StartsWith(string.Format("Validatie mislukt: De standaard afwijking voor '{0}' moet groter zijn dan of gelijk zijn aan 0.", parameterNames["allowedLevelIncreaseStorage"]), msgs[15]);
+                StringAssert.StartsWith(string.Format("Validatie mislukt: De verwachtingswaarde voor '{0}' moet een concreet getal zijn.", parameterNames["thresholdHeightOpenWeir"]), msgs[16]);
+                StringAssert.StartsWith(string.Format("Validatie mislukt: De standaard afwijking voor '{0}' moet groter zijn dan of gelijk zijn aan 0.", parameterNames["thresholdHeightOpenWeir"]), msgs[17]);
+                StringAssert.StartsWith(string.Format("Validatie mislukt: De verwachtingswaarde voor '{0}' moet een positief getal zijn.", parameterNames["criticalOvertoppingDischarge"]), msgs[18]);
+                StringAssert.StartsWith(string.Format("Validatie mislukt: De variatiecoëfficient voor '{0}' moet groter zijn dan of gelijk zijn aan 0.", parameterNames["criticalOvertoppingDischarge"]), msgs[19]);
+                StringAssert.StartsWith(string.Format("Validatie van '{0}' beëindigd om: ", name), msgs[20]);
+            });
+            Assert.IsFalse(isValid);
+
+            mockRepository.VerifyAll();
+        }
+
+        [Test]
         public void Validate_InvalidInFlowModelType_ThrowsNotSupportedException()
         {
             // Setup 
@@ -361,6 +376,7 @@
             // Assert
             var exception = Assert.Throws<InvalidEnumArgumentException>(call);
             Assert.AreEqual("inputParameters", exception.ParamName);
+            StringAssert.StartsWith("The value of argument 'inputParameters' (9001) is invalid for Enum type 'ClosingStructureInflowModelType'.", exception.Message);
             Assert.IsFalse(isValid);
             mockRepository.VerifyAll();
         }
@@ -855,5 +871,61 @@
             };
             return assessmentSectionStub;
         }
+
+        private static void SetInvalidInputParameters(StructuresCalculation<ClosingStructuresInput> input, RoundedDouble value)
+        {
+            input.InputParameters.DeviationWaveDirection = RoundedDouble.NaN;
+            input.InputParameters.DrainCoefficient.Mean = value;
+            input.InputParameters.FactorStormDurationOpenStructure = value;
+            input.InputParameters.InsideWaterLevel.Mean = value;
+            input.InputParameters.LevelCrestStructureNotClosing.Mean = value;
+            input.InputParameters.ModelFactorSuperCriticalFlow.Mean = value;
+            input.InputParameters.StructureNormalOrientation = RoundedDouble.NaN;
+            input.InputParameters.ThresholdHeightOpenWeir.Mean = value;
+            input.InputParameters.WidthFlowApertures.Mean = value;
+
+            if (double.IsNegativeInfinity(value))
+            {
+                input.InputParameters.AllowedLevelIncreaseStorage.Mean = RoundedDouble.NaN;
+                input.InputParameters.AllowedLevelIncreaseStorage.StandardDeviation = RoundedDouble.NaN;
+                input.InputParameters.AreaFlowApertures.Mean = RoundedDouble.NaN;
+                input.InputParameters.AreaFlowApertures.StandardDeviation = RoundedDouble.NaN;
+                input.InputParameters.CriticalOvertoppingDischarge.Mean = RoundedDouble.NaN;
+                input.InputParameters.CriticalOvertoppingDischarge.CoefficientOfVariation = RoundedDouble.NaN;
+                input.InputParameters.DrainCoefficient.StandardDeviation = RoundedDouble.NaN;
+                input.InputParameters.FlowWidthAtBottomProtection.Mean = RoundedDouble.NaN;
+                input.InputParameters.FlowWidthAtBottomProtection.StandardDeviation = RoundedDouble.NaN;
+                input.InputParameters.InsideWaterLevel.StandardDeviation = RoundedDouble.NaN;
+                input.InputParameters.LevelCrestStructureNotClosing.StandardDeviation = RoundedDouble.NaN;
+                input.InputParameters.ModelFactorSuperCriticalFlow.StandardDeviation = RoundedDouble.NaN;
+                input.InputParameters.StorageStructureArea.Mean = RoundedDouble.NaN;
+                input.InputParameters.StorageStructureArea.CoefficientOfVariation = RoundedDouble.NaN;
+                input.InputParameters.StormDuration.Mean = RoundedDouble.NaN;
+                input.InputParameters.StormDuration.CoefficientOfVariation = RoundedDouble.NaN;
+                input.InputParameters.ThresholdHeightOpenWeir.StandardDeviation = RoundedDouble.NaN;
+                input.InputParameters.WidthFlowApertures.CoefficientOfVariation = RoundedDouble.NaN;
+            }
+            else
+            {
+                input.InputParameters.AllowedLevelIncreaseStorage.Mean = value;
+                input.InputParameters.AllowedLevelIncreaseStorage.StandardDeviation = value;
+                input.InputParameters.AreaFlowApertures.Mean = value;
+                input.InputParameters.AreaFlowApertures.StandardDeviation = value;
+                input.InputParameters.CriticalOvertoppingDischarge.Mean = value;
+                input.InputParameters.CriticalOvertoppingDischarge.CoefficientOfVariation = value;
+                input.InputParameters.DrainCoefficient.StandardDeviation = value;
+                input.InputParameters.FlowWidthAtBottomProtection.Mean = value;
+                input.InputParameters.FlowWidthAtBottomProtection.StandardDeviation = value;
+                input.InputParameters.InsideWaterLevel.StandardDeviation = value;
+                input.InputParameters.LevelCrestStructureNotClosing.StandardDeviation = value;
+                input.InputParameters.ModelFactorSuperCriticalFlow.StandardDeviation = value;
+                input.InputParameters.StorageStructureArea.Mean = value;
+                input.InputParameters.StorageStructureArea.CoefficientOfVariation = value;
+                input.InputParameters.StormDuration.Mean = value;
+                input.InputParameters.StormDuration.CoefficientOfVariation = value;
+                input.InputParameters.ThresholdHeightOpenWeir.StandardDeviation = value;
+                input.InputParameters.WidthFlowApertures.CoefficientOfVariation = value;
+            }
+        }
     }
 }
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