Index: Ringtoets/Piping/src/Ringtoets.Piping.IO/SurfaceLines/PipingSurfaceLinesCsvReader.cs
===================================================================
diff -u -r68597fa1a4f4d31ee209873eec139f9412026bd2 -r59ea94f47cbf3b4830b14bf87e3609341785a1df
--- Ringtoets/Piping/src/Ringtoets.Piping.IO/SurfaceLines/PipingSurfaceLinesCsvReader.cs	(.../PipingSurfaceLinesCsvReader.cs)	(revision 68597fa1a4f4d31ee209873eec139f9412026bd2)
+++ Ringtoets/Piping/src/Ringtoets.Piping.IO/SurfaceLines/PipingSurfaceLinesCsvReader.cs	(.../PipingSurfaceLinesCsvReader.cs)	(revision 59ea94f47cbf3b4830b14bf87e3609341785a1df)
@@ -65,6 +65,9 @@
         private StreamReader fileReader;
         private int lineNumber;
 
+        private int idNameColumnIndex;
+        private int startGeometryColumnIndex;
+
         /// <summary>
         /// Initializes a new instance of the <see cref="PipingSurfaceLinesCsvReader"/> class
         /// and opens a given file path.
@@ -283,7 +286,7 @@
         /// <exception cref="LineParseException">Id value is null or empty.</exception>
         private string GetSurfaceLineName(IList<string> tokenizedString)
         {
-            var name = tokenizedString.Any() ? tokenizedString[0].Trim() : string.Empty;
+            var name = tokenizedString.Any() ? tokenizedString[idNameColumnIndex].Trim() : string.Empty;
             if (string.IsNullOrEmpty(name))
             {
                 throw CreateLineParseException(lineNumber, Resources.PipingSurfaceLinesCsvReader_ReadLine_Line_lacks_ID);
@@ -307,7 +310,7 @@
         {
             try
             {
-                return tokenizedString.Skip(1)
+                return tokenizedString.Skip(startGeometryColumnIndex)
                                       .Select(ts => Double.Parse(ts, CultureInfo.InvariantCulture))
                                       .ToArray();
             }
@@ -441,18 +444,45 @@
             var tokenizedHeader = header.Split(separator).Select(s => s.Trim().ToLowerInvariant()).ToArray();
 
             // Check for valid id:
-            if (!acceptableLowerCaseIdNames.Contains(tokenizedHeader[0]))
+            DetermineIdNameColumnIndex(tokenizedHeader);
+
+            if (idNameColumnIndex == -1)
             {
                 return false;
             }
 
             // Check for valid 1st coordinate in header:
+            DetermineStartGeometryColumnIndex(tokenizedHeader);
+
+            if (startGeometryColumnIndex == -1)
+            {
+                return false;
+            }
+
             bool valid = true;
             for (int i = 0; i < expectedFirstCoordinateHeader.Length && valid; i++)
             {
-                valid = tokenizedHeader[1 + i].Equals(expectedFirstCoordinateHeader[i]);
+                valid = tokenizedHeader[startGeometryColumnIndex + i].Equals(expectedFirstCoordinateHeader[i]);
             }
             return valid;
         }
+
+        private void DetermineStartGeometryColumnIndex(string[] tokenizedHeader)
+        {
+            startGeometryColumnIndex = Array.IndexOf(tokenizedHeader, expectedFirstCoordinateHeader[0]);
+        }
+
+        private void DetermineIdNameColumnIndex(string[] tokenizedHeader)
+        {
+            idNameColumnIndex = -1;
+            foreach (string name in acceptableLowerCaseIdNames)
+            {
+                idNameColumnIndex = Array.IndexOf(tokenizedHeader, name);
+                if (idNameColumnIndex > -1)
+                {
+                    break;
+                }
+            }
+        }
     }
 }
\ No newline at end of file
Index: Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/SurfaceLines/PipingSurfaceLinesCsvReaderTest.cs
===================================================================
diff -u -r68597fa1a4f4d31ee209873eec139f9412026bd2 -r59ea94f47cbf3b4830b14bf87e3609341785a1df
--- Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/SurfaceLines/PipingSurfaceLinesCsvReaderTest.cs	(.../PipingSurfaceLinesCsvReaderTest.cs)	(revision 68597fa1a4f4d31ee209873eec139f9412026bd2)
+++ Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/SurfaceLines/PipingSurfaceLinesCsvReaderTest.cs	(.../PipingSurfaceLinesCsvReaderTest.cs)	(revision 59ea94f47cbf3b4830b14bf87e3609341785a1df)
@@ -93,6 +93,22 @@
         }
 
         [Test]
+        public void GetSurfaceLinesCount_OpenedValidFileWithHeaderWithOptionalHeadersAndTwoSurfaceLines_ReturnNumberOfSurfaceLines()
+        {
+            // Setup
+            string path = Path.Combine(testDataPath, "TwoValidSurfaceLines_WithOptionalHeaders.csv");
+
+            using (var reader = new PipingSurfaceLinesCsvReader(path))
+            {
+                // Call
+                int linesCount = reader.GetSurfaceLinesCount();
+
+                // Assert
+                Assert.AreEqual(2, linesCount);
+            }
+        }
+
+        [Test]
         public void GetSurfaceLinesCount_OpenedValidFileWithHeaderAndNoSurfaceLines_ReturnZero()
         {
             // Setup
@@ -283,6 +299,55 @@
         }
 
         [Test]
+        public void DoReadLine_OpenedValidFileWithHeaderAndTwoSurfaceLinesWithOptionalHeaders_ReturnCreatedSurfaceLine()
+        {
+            // Setup
+            string path = Path.Combine(testDataPath, "TwoValidSurfaceLines_WithOptionalHeaders.csv");
+
+            // Precondition:
+            Assert.IsTrue(File.Exists(path));
+
+            using (var reader = new PipingSurfaceLinesCsvReader(path))
+            {
+                // Call
+                var surfaceLine1 = reader.ReadSurfaceLine();
+                var surfaceLine2 = reader.ReadSurfaceLine();
+
+                // Assert
+
+                #region 1st surfaceline
+
+                Assert.AreEqual("Rotterdam1", surfaceLine1.Name);
+                Assert.AreEqual(8, surfaceLine1.Points.Count());
+                Assert.AreEqual(94263.0026213, surfaceLine1.StartingWorldPoint.X);
+                Assert.AreEqual(427776.654093, surfaceLine1.StartingWorldPoint.Y);
+                Assert.AreEqual(-1.02, surfaceLine1.StartingWorldPoint.Z);
+                Assert.AreEqual(94331.1767309, surfaceLine1.EndingWorldPoint.X);
+                Assert.AreEqual(427960.112661, surfaceLine1.EndingWorldPoint.Y);
+                Assert.AreEqual(1.44, surfaceLine1.EndingWorldPoint.Z);
+                Assert.AreEqual(surfaceLine1.StartingWorldPoint, surfaceLine1.Points.First());
+                Assert.AreEqual(surfaceLine1.EndingWorldPoint, surfaceLine1.Points.Last());
+
+                #endregion
+
+                #region 2nd surfaceline
+
+                Assert.AreEqual("ArtifcialLocal", surfaceLine2.Name);
+                Assert.AreEqual(3, surfaceLine2.Points.Count());
+                Assert.AreEqual(2.3, surfaceLine2.StartingWorldPoint.X);
+                Assert.AreEqual(0, surfaceLine2.StartingWorldPoint.Y);
+                Assert.AreEqual(1, surfaceLine2.StartingWorldPoint.Z);
+                Assert.AreEqual(5.7, surfaceLine2.EndingWorldPoint.X);
+                Assert.AreEqual(0, surfaceLine2.EndingWorldPoint.Y);
+                Assert.AreEqual(1.1, surfaceLine2.EndingWorldPoint.Z);
+                Assert.AreEqual(surfaceLine2.StartingWorldPoint, surfaceLine2.Points.First());
+                Assert.AreEqual(surfaceLine2.EndingWorldPoint, surfaceLine2.Points.Last());
+
+                #endregion
+            }
+        }
+
+        [Test]
         [SetCulture("en-US")]
         public void ReadLine_OpenedValidFileWithHeaderAndSurfaceLinesWithDuplicatePointsWithCultureEN_ReturnCreatedSurfaceLineWithDuplicatePoints()
         {
Index: Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/test-data/SurfaceLines/TwoValidSurfaceLines_WithOptionalHeaders.csv
===================================================================
diff -u
--- Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/test-data/SurfaceLines/TwoValidSurfaceLines_WithOptionalHeaders.csv	(revision 0)
+++ Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/test-data/SurfaceLines/TwoValidSurfaceLines_WithOptionalHeaders.csv	(revision 59ea94f47cbf3b4830b14bf87e3609341785a1df)
@@ -0,0 +1,3 @@
+Profielnaam;Geologischprofiel;X_GridPoint;Y_GridPoint;ScenarioClusterID;X1;Y1;Z1;...;Xn;Yn;Zn;;;;;;;;;;;;;;;;;
+Rotterdam1;1;36.17;0;1;94263.0026213;427776.654093;-1.02;94275.9126686;427811.080886;-1.04;94284.0663827;427831.918156;1.25;94294.9380015;427858.191234;1.45;94305.3566362;427889.900123;1.65;94315.0957947;427913.908281;1.66;94325.0614453;427941.766804;1.55;94331.1767309;427960.112661;1.44
+ArtifcialLocal;1;44.22;0;1;2.3;0;1.0;4.4;0;2.0;5.7;0;1.1;;;;;;;;;;;;;;;