Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesOperational/OperationalCalculator.cs
===================================================================
diff -u -r2656 -r2695
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesOperational/OperationalCalculator.cs	(.../OperationalCalculator.cs)	(revision 2656)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesOperational/OperationalCalculator.cs	(.../OperationalCalculator.cs)	(revision 2695)
@@ -130,19 +130,25 @@
                         FailureMechanismSystemType soilProbabilityFailureMechanismSystemType = damProjectData.DamProjectCalculationSpecification.CurrentSpecification.FailureMechanismSystemType;
                         var soiProfileProbability = location.Segment.GetMostProbableSoilGeometryProbability(
                             ConversionHelper.ConvertToSegmentFailureMechanismType(soilProbabilityFailureMechanismSystemType));
-                        var projectPath = damProjectData.ProjectPath != "" ? damProjectData.ProjectPath : Directory.GetCurrentDirectory();
-                        var calculationMessages = new List<LogMessage>();
-                        operationalCalculatorTasks.Add(new OperationalCalculatorTask()
+                        if (soiProfileProbability != null)
                         {
-                            Location = location,
-                            SoiProfileProbability = soiProfileProbability,
-                            ProjectPath = projectPath,
-                            CalculationMap = damProjectData.CalculationMap,
-                            FailureMechanismeCalculationSpecification = damProjectData.DamProjectCalculationSpecification.CurrentSpecification,
-                            TimeSerieEntry = entry,
-                            TimeStepIndex = entryIndex,
-                            CalculationMessages = calculationMessages
-                        });
+                            var projectPath = damProjectData.ProjectPath != ""
+                                ? damProjectData.ProjectPath
+                                : Directory.GetCurrentDirectory();
+                            var calculationMessages = new List<LogMessage>();
+                            operationalCalculatorTasks.Add(new OperationalCalculatorTask()
+                            {
+                                Location = location,
+                                SoiProfileProbability = soiProfileProbability,
+                                ProjectPath = projectPath,
+                                CalculationMap = damProjectData.CalculationMap,
+                                FailureMechanismeCalculationSpecification = damProjectData
+                                    .DamProjectCalculationSpecification.CurrentSpecification,
+                                TimeSerieEntry = entry,
+                                TimeStepIndex = entryIndex,
+                                CalculationMessages = calculationMessages
+                            });
+                        }
                     }
                     else
                     {
@@ -153,13 +159,29 @@
                 }
             }
 
-            // Perform the calculation
-            Parallel.Run(operationalCalculatorTasks, RunOperationalCalculatorTask, null, damProjectData.MaxCalculationCores);
-            foreach (var operationalCalculatorTask in operationalCalculatorTasks)
+            if (operationalCalculatorTasks.Count > 0)
             {
-                damProjectData.CalculationMessages.AddRange(operationalCalculatorTask.CalculationMessages);
+                // Perform the calculation
+                Parallel.Run(operationalCalculatorTasks, RunOperationalCalculatorTask, null,
+                    damProjectData.MaxCalculationCores);
+                foreach (var operationalCalculatorTask in operationalCalculatorTasks)
+                {
+                    damProjectData.CalculationMessages.AddRange(operationalCalculatorTask.CalculationMessages);
+                }
+
+                damProjectData.OutputTimeSerieCollection = outputTimeSerieCollection;
             }
-            damProjectData.OutputTimeSerieCollection = outputTimeSerieCollection;
+            else
+            {
+                var logMessage = new LogMessage
+                {
+                    MessageType = LogMessageType.Error,
+                    Subject = null,
+                    Message = string.Format(Resources.DesignCalculatorNoSegmentsWithFailureMechanismTypePresent,
+                        damProjectData.DamProjectCalculationSpecification.CurrentSpecification.FailureMechanismSystemType.ToString())
+                };
+                damProjectData.CalculationMessages.Add(logMessage);
+            }
         }
 
         private void RunOperationalCalculatorTask(object operationalCalculatorTask)
@@ -341,7 +363,20 @@
                     }
                     break;
                 case FailureMechanismSystemType.Piping:
-                    throw new NotImplementedException();
+                    switch (currentSpecification.PipingModelType)
+                    {
+                        case PipingModelType.Bligh:
+                            throw new NotImplementedException();                            
+                        case PipingModelType.SellmeijerVnk:
+                            throw new NotImplementedException();
+                        case PipingModelType.Sellmeijer4Forces:
+                            throw new NotImplementedException();
+                        case PipingModelType.Wti2017:
+                            parameter = TimeSerieParameters.StabilityInsideFactor.ToString();
+                            break;
+                    }
+                    break;
+                    
             }
             return parameter;
         }