Index: Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/SerializableAssessmentSection.cs
===================================================================
diff -u -r5c59e60cae7bc68b321c0ee187a7d4dd9dd753b2 -r40cea250dc8bceda2770ba103d1b9e1ebe1c267c
--- Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/SerializableAssessmentSection.cs	(.../SerializableAssessmentSection.cs)	(revision 5c59e60cae7bc68b321c0ee187a7d4dd9dd753b2)
+++ Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/SerializableAssessmentSection.cs	(.../SerializableAssessmentSection.cs)	(revision 40cea250dc8bceda2770ba103d1b9e1ebe1c267c)
@@ -48,12 +48,11 @@
         /// <param name="id">The unique ID of the assessment section.</param>
         /// <param name="name">The name of the assessment section.</param>
         /// <param name="surfaceLineLength">The length of the surface line in meters.</param>
-        /// <param name="surfaceLineGeometry">The geometry of the surface line.</param>
+        /// <param name="geometry">The geometry of the surface line.</param>
         /// <exception cref="ArgumentNullException">Thrown when any parameter is <c>null</c>.</exception>
         public SerializableAssessmentSection(string id,
                                              string name,
-                                             double surfaceLineLength,
-                                             IEnumerable<Point2D> surfaceLineGeometry) : this()
+                                             IEnumerable<Point2D> geometry) : this()
         {
             if (id == null)
             {
@@ -65,15 +64,15 @@
                 throw new ArgumentNullException(nameof(name));
             }
 
-            if (surfaceLineGeometry == null)
+            if (geometry == null)
             {
-                throw new ArgumentNullException(nameof(surfaceLineGeometry));
+                throw new ArgumentNullException(nameof(geometry));
             }
 
             Id = id;
             Name = name;
-            SurfaceLineLength = new SerializableMeasure("m", surfaceLineLength);
-            SurfaceLineGeometry = new SerializableLine(surfaceLineGeometry);
+            SurfaceLineLength = new SerializableMeasure("m", Math2D.Length(geometry));
+            SurfaceLineGeometry = new SerializableLine(geometry);
         }
 
         /// <summary>
Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableAssessmentProcessTest.cs
===================================================================
diff -u -rc37e7aa9fdd38a0476335e056b33c583486ed1af -r40cea250dc8bceda2770ba103d1b9e1ebe1c267c
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableAssessmentProcessTest.cs	(.../SerializableAssessmentProcessTest.cs)	(revision c37e7aa9fdd38a0476335e056b33c583486ed1af)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableAssessmentProcessTest.cs	(.../SerializableAssessmentProcessTest.cs)	(revision 40cea250dc8bceda2770ba103d1b9e1ebe1c267c)
@@ -98,7 +98,6 @@
             var assessmentSection = new SerializableAssessmentSection(
                 "assessment section id",
                 "name",
-                random.NextDouble(),
                 new[]
                 {
                     new Point2D(random.NextDouble(), random.NextDouble()),
Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableAssessmentSectionTest.cs
===================================================================
diff -u -r5c59e60cae7bc68b321c0ee187a7d4dd9dd753b2 -r40cea250dc8bceda2770ba103d1b9e1ebe1c267c
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableAssessmentSectionTest.cs	(.../SerializableAssessmentSectionTest.cs)	(revision 5c59e60cae7bc68b321c0ee187a7d4dd9dd753b2)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableAssessmentSectionTest.cs	(.../SerializableAssessmentSectionTest.cs)	(revision 40cea250dc8bceda2770ba103d1b9e1ebe1c267c)
@@ -64,7 +64,6 @@
             // Call
             TestDelegate call = () => new SerializableAssessmentSection(null,
                                                                         "name",
-                                                                        new Random(39).NextDouble(),
                                                                         Enumerable.Empty<Point2D>());
 
             // Assert
@@ -78,7 +77,6 @@
             // Call
             TestDelegate call = () => new SerializableAssessmentSection("id",
                                                                         null,
-                                                                        new Random(39).NextDouble(),
                                                                         Enumerable.Empty<Point2D>());
 
             // Assert
@@ -87,17 +85,16 @@
         }
 
         [Test]
-        public void Constructor_SurfaceLineGeometryNull_ThrowsArgumentNullException()
+        public void Constructor_GeometryNull_ThrowsArgumentNullException()
         {
             // Call
             TestDelegate call = () => new SerializableAssessmentSection("id",
                                                                         "name",
-                                                                        new Random(39).NextDouble(),
                                                                         null);
 
             // Assert
             var exception = Assert.Throws<ArgumentNullException>(call);
-            Assert.AreEqual("surfaceLineGeometry", exception.ParamName);
+            Assert.AreEqual("geometry", exception.ParamName);
         }
 
         [Test]
@@ -108,21 +105,20 @@
             const string id = "section id";
 
             var random = new Random(39);
-            double length = random.NextDouble();
             var geometry = new[]
             {
                 new Point2D(random.NextDouble(), random.NextDouble()),
                 new Point2D(random.NextDouble(), random.NextDouble())
             };
 
             // Call
-            var assessmentSection = new SerializableAssessmentSection(id, name, length, geometry);
+            var assessmentSection = new SerializableAssessmentSection(id, name, geometry);
 
             // Assert
             Assert.AreEqual(id, assessmentSection.Id);
             Assert.AreEqual(name, assessmentSection.Name);
             Assert.AreEqual("m", assessmentSection.SurfaceLineLength.UnitOfMeasure);
-            Assert.AreEqual(length, assessmentSection.SurfaceLineLength.Value);
+            Assert.AreEqual(Math2D.Length(geometry), assessmentSection.SurfaceLineLength.Value);
             Assert.IsNotNull(assessmentSection.SurfaceLineGeometry);
         }
     }