Index: Ringtoets/Common/src/Ringtoets.Common.Forms/PropertyClasses/FailureMechanismSectionsProbabilityAssessmentProperties.cs
===================================================================
diff -u -rdbc19eb83d1a3fc64a5f4f4bc2889583a65b4656 -rd17cff71645c0e605aaf84268caaad7c3d886da2
--- Ringtoets/Common/src/Ringtoets.Common.Forms/PropertyClasses/FailureMechanismSectionsProbabilityAssessmentProperties.cs	(.../FailureMechanismSectionsProbabilityAssessmentProperties.cs)	(revision dbc19eb83d1a3fc64a5f4f4bc2889583a65b4656)
+++ Ringtoets/Common/src/Ringtoets.Common.Forms/PropertyClasses/FailureMechanismSectionsProbabilityAssessmentProperties.cs	(.../FailureMechanismSectionsProbabilityAssessmentProperties.cs)	(revision d17cff71645c0e605aaf84268caaad7c3d886da2)
@@ -20,6 +20,7 @@
 // All rights reserved.
 
 using System;
+using System.Collections.Generic;
 using System.ComponentModel;
 using System.Linq;
 using Core.Common.Base;
@@ -92,8 +93,17 @@
         {
             get
             {
-                return data.Sections.Select(section => new FailureMechanismSectionProbabilityAssessmentProperties(section, 0, 0,
-                                                                                                                  probabilityAssessmentInput)).ToArray();
+                var properties = new List<FailureMechanismSectionProbabilityAssessmentProperties>();
+                double sectionStart = 0;
+                foreach (FailureMechanismSection section in data.Sections)
+                {
+                    double sectionEnd = sectionStart + section.Length;
+                    properties.Add(new FailureMechanismSectionProbabilityAssessmentProperties(section, sectionStart, sectionEnd,
+                                                                                              probabilityAssessmentInput));
+                    sectionStart = sectionEnd;
+                }
+
+                return properties.ToArray();
             }
         }
 
Index: Ringtoets/Common/src/Ringtoets.Common.Forms/PropertyClasses/FailureMechanismSectionsProperties.cs
===================================================================
diff -u -rdbc19eb83d1a3fc64a5f4f4bc2889583a65b4656 -rd17cff71645c0e605aaf84268caaad7c3d886da2
--- Ringtoets/Common/src/Ringtoets.Common.Forms/PropertyClasses/FailureMechanismSectionsProperties.cs	(.../FailureMechanismSectionsProperties.cs)	(revision dbc19eb83d1a3fc64a5f4f4bc2889583a65b4656)
+++ Ringtoets/Common/src/Ringtoets.Common.Forms/PropertyClasses/FailureMechanismSectionsProperties.cs	(.../FailureMechanismSectionsProperties.cs)	(revision d17cff71645c0e605aaf84268caaad7c3d886da2)
@@ -20,6 +20,7 @@
 // All rights reserved.
 
 using System;
+using System.Collections.Generic;
 using System.ComponentModel;
 using System.Linq;
 using Core.Common.Base;
@@ -81,7 +82,16 @@
         {
             get
             {
-                return data.Sections.Select(section => new FailureMechanismSectionProperties(section, 0, 0)).ToArray();
+                var properties = new List<FailureMechanismSectionProperties>();
+                double sectionStart = 0;
+                foreach (FailureMechanismSection section in data.Sections)
+                {
+                    double sectionEnd = sectionStart + section.Length;
+                    properties.Add(new FailureMechanismSectionProperties(section, sectionStart, sectionEnd));
+                    sectionStart = sectionEnd;
+                }
+
+                return properties.ToArray();
             }
         }
 
Index: Ringtoets/Common/test/Ringtoets.Common.Forms.Test/PropertyClasses/FailureMechanismSectionsProbabilityAssessmentPropertiesTest.cs
===================================================================
diff -u -rdbc19eb83d1a3fc64a5f4f4bc2889583a65b4656 -rd17cff71645c0e605aaf84268caaad7c3d886da2
--- Ringtoets/Common/test/Ringtoets.Common.Forms.Test/PropertyClasses/FailureMechanismSectionsProbabilityAssessmentPropertiesTest.cs	(.../FailureMechanismSectionsProbabilityAssessmentPropertiesTest.cs)	(revision dbc19eb83d1a3fc64a5f4f4bc2889583a65b4656)
+++ Ringtoets/Common/test/Ringtoets.Common.Forms.Test/PropertyClasses/FailureMechanismSectionsProbabilityAssessmentPropertiesTest.cs	(.../FailureMechanismSectionsProbabilityAssessmentPropertiesTest.cs)	(revision d17cff71645c0e605aaf84268caaad7c3d886da2)
@@ -100,6 +100,8 @@
                 TestHelper.AssertTypeConverter<FailureMechanismSectionsProperties, ExpandableArrayConverter>(
                     nameof(FailureMechanismSectionsProperties.Sections));
                 Assert.AreEqual(sections.Count(), properties.Sections.Length);
+
+                double sectionStart = 0;
                 for (var i = 0; i < sections.Count(); i++)
                 {
                     FailureMechanismSection section = sections.ElementAt(i);
@@ -110,8 +112,10 @@
                                     property.N,
                                     property.N.GetAccuracy());
 
-                    Assert.AreEqual(0, property.SectionStart, property.SectionStart.GetAccuracy());
-                    Assert.AreEqual(0, property.SectionEnd, property.SectionEnd.GetAccuracy());
+                    double sectionEnd = sectionStart + section.Length;
+                    Assert.AreEqual(sectionStart, property.SectionStart, property.SectionStart.GetAccuracy());
+                    Assert.AreEqual(sectionEnd, property.SectionEnd, property.SectionEnd.GetAccuracy());
+                    sectionStart = sectionEnd;
                 }
 
                 Assert.AreEqual(sourcePath, properties.SourcePath);
Index: Ringtoets/Common/test/Ringtoets.Common.Forms.Test/PropertyClasses/FailureMechanismSectionsPropertiesTest.cs
===================================================================
diff -u -rdbc19eb83d1a3fc64a5f4f4bc2889583a65b4656 -rd17cff71645c0e605aaf84268caaad7c3d886da2
--- Ringtoets/Common/test/Ringtoets.Common.Forms.Test/PropertyClasses/FailureMechanismSectionsPropertiesTest.cs	(.../FailureMechanismSectionsPropertiesTest.cs)	(revision dbc19eb83d1a3fc64a5f4f4bc2889583a65b4656)
+++ Ringtoets/Common/test/Ringtoets.Common.Forms.Test/PropertyClasses/FailureMechanismSectionsPropertiesTest.cs	(.../FailureMechanismSectionsPropertiesTest.cs)	(revision d17cff71645c0e605aaf84268caaad7c3d886da2)
@@ -1,4 +1,4 @@
-// Copyright (C) Stichting Deltares 2017. All rights reserved.
+// Copyright (C) Stichting Deltares 2017. All rights reserved.
 //
 // This file is part of Ringtoets.
 //
@@ -72,13 +72,18 @@
                 TestHelper.AssertTypeConverter<FailureMechanismSectionsProperties, ExpandableArrayConverter>(
                     nameof(FailureMechanismSectionsProperties.Sections));
                 Assert.AreEqual(sections.Count(), properties.Sections.Length);
+
+                double sectionStart = 0;
                 for (var i = 0; i < sections.Count(); i++)
                 {
                     FailureMechanismSection section = sections.ElementAt(i);
                     FailureMechanismSectionProperties property = properties.Sections[i];
                     Assert.AreSame(section, property.Data);
-                    Assert.AreEqual(0, property.SectionStart, property.SectionStart.GetAccuracy());
-                    Assert.AreEqual(0, property.SectionEnd, property.SectionEnd.GetAccuracy());
+
+                    double sectionEnd = sectionStart + section.Length;
+                    Assert.AreEqual(sectionStart, property.SectionStart, property.SectionStart.GetAccuracy());
+                    Assert.AreEqual(sectionEnd, property.SectionEnd, property.SectionEnd.GetAccuracy());
+                    sectionStart = sectionEnd;
                 }
 
                 Assert.AreEqual(sourcePath, properties.SourcePath);