Index: Ringtoets/Piping/src/Ringtoets.Piping.IO/Importer/ISurfaceLineUpdateStrategy.cs
===================================================================
diff -u
--- Ringtoets/Piping/src/Ringtoets.Piping.IO/Importer/ISurfaceLineUpdateStrategy.cs	(revision 0)
+++ Ringtoets/Piping/src/Ringtoets.Piping.IO/Importer/ISurfaceLineUpdateStrategy.cs	(revision ee74bbc714b9c3d6b46e7c7734640366ef197ef6)
@@ -0,0 +1,49 @@
+// Copyright (C) Stichting Deltares 2016. All rights reserved.
+//
+// This file is part of Ringtoets.
+//
+// Ringtoets is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System;
+using System.Collections.Generic;
+using Core.Common.Base;
+using Ringtoets.Piping.Primitives;
+
+namespace Ringtoets.Piping.IO.Importer
+{
+    /// <summary>
+    /// Interface describing the method of updating the data model after new surface lines 
+    /// have been imported.
+    /// </summary>
+    public interface ISurfaceLineUpdateStrategy
+    {
+        /// <summary>
+        /// Adds the imported data to the <paramref name="targetCollection"/>.
+        /// </summary>
+        /// <param name="targetCollection">The <see cref="ObservableCollectionWithSourcePath{RingtoetsPipingSurfaceLines}"/> 
+        /// which needs to be updated.</param>
+        /// <param name="readRingtoetsPipingSurfaceLines">The imported surface lines.</param>
+        /// <param name="sourceFilePath">The source path from where the surface lines were imported from.</param>
+        /// <returns>An <see cref="IEnumerable{IObservable}"/> of updated instances.</returns>
+        /// <exception cref="ArgumentNullException">Thrown when any of the input parameters is <c>null</c></exception>
+        IEnumerable<IObservable> UpdateSurfaceLinesWithImportedData(
+            ObservableCollectionWithSourcePath<RingtoetsPipingSurfaceLine> targetCollection,
+            IEnumerable<RingtoetsPipingSurfaceLine> readRingtoetsPipingSurfaceLines,
+            string sourceFilePath);
+    }
+}
Index: Ringtoets/Piping/src/Ringtoets.Piping.IO/Ringtoets.Piping.IO.csproj
===================================================================
diff -u -ra59b471e3b6a02319f91b7317b3814a099ef0221 -ree74bbc714b9c3d6b46e7c7734640366ef197ef6
--- Ringtoets/Piping/src/Ringtoets.Piping.IO/Ringtoets.Piping.IO.csproj	(.../Ringtoets.Piping.IO.csproj)	(revision a59b471e3b6a02319f91b7317b3814a099ef0221)
+++ Ringtoets/Piping/src/Ringtoets.Piping.IO/Ringtoets.Piping.IO.csproj	(.../Ringtoets.Piping.IO.csproj)	(revision ee74bbc714b9c3d6b46e7c7734640366ef197ef6)
@@ -54,6 +54,7 @@
     <Compile Include="Exceptions\StochasticSoilProfileReadException.cs" />
     <Compile Include="Importer\IStochasticSoilModelChangeHandler.cs" />
     <Compile Include="Importer\IStochasticSoilModelUpdateModelStrategy.cs" />
+    <Compile Include="Importer\ISurfaceLineUpdateStrategy.cs" />
     <Compile Include="Importer\StochasticSoilModelImporter.cs" />
     <Compile Include="Importer\StochasticSoilModelUpdateException.cs" />
     <Compile Include="SoilProfile\LayerProperties.cs" />
Index: Ringtoets/Piping/src/Ringtoets.Piping.Plugin/FileImporter/RingtoetsPipingSurfaceLineReplaceDataStrategy.cs
===================================================================
diff -u
--- Ringtoets/Piping/src/Ringtoets.Piping.Plugin/FileImporter/RingtoetsPipingSurfaceLineReplaceDataStrategy.cs	(revision 0)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Plugin/FileImporter/RingtoetsPipingSurfaceLineReplaceDataStrategy.cs	(revision ee74bbc714b9c3d6b46e7c7734640366ef197ef6)
@@ -0,0 +1,61 @@
+// Copyright (C) Stichting Deltares 2016. All rights reserved.
+//
+// This file is part of Ringtoets.
+//
+// Ringtoets is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System;
+using System.Collections.Generic;
+using Core.Common.Base;
+using Ringtoets.Piping.IO.Importer;
+using Ringtoets.Piping.Primitives;
+
+namespace Ringtoets.Piping.Plugin.FileImporter
+{
+    /// <summary>
+    /// Strategy to replace the surface lines with the imported surface lines.
+    /// </summary>
+    public class RingtoetsPipingSurfaceLineReplaceDataStrategy : ISurfaceLineUpdateStrategy
+    {
+        public IEnumerable<IObservable> UpdateSurfaceLinesWithImportedData(ObservableCollectionWithSourcePath<RingtoetsPipingSurfaceLine> targetCollection,
+                                                                    IEnumerable<RingtoetsPipingSurfaceLine> readRingtoetsPipingSurfaceLines,
+                                                                    string sourceFilePath)
+        {
+            if (targetCollection == null)
+            {
+                throw new ArgumentNullException(nameof(targetCollection));
+            }
+            if (readRingtoetsPipingSurfaceLines == null)
+            {
+                throw new ArgumentNullException(nameof(readRingtoetsPipingSurfaceLines));
+            }
+            if (sourceFilePath == null)
+            {
+                throw new ArgumentNullException(nameof(sourceFilePath));
+            }
+
+            targetCollection.Clear();
+            targetCollection.AddRange(readRingtoetsPipingSurfaceLines, sourceFilePath);
+
+            return new []
+            {
+                targetCollection
+            };
+        }
+    }
+}
\ No newline at end of file
Index: Ringtoets/Piping/src/Ringtoets.Piping.Plugin/Ringtoets.Piping.Plugin.csproj
===================================================================
diff -u -ra59b471e3b6a02319f91b7317b3814a099ef0221 -ree74bbc714b9c3d6b46e7c7734640366ef197ef6
--- Ringtoets/Piping/src/Ringtoets.Piping.Plugin/Ringtoets.Piping.Plugin.csproj	(.../Ringtoets.Piping.Plugin.csproj)	(revision a59b471e3b6a02319f91b7317b3814a099ef0221)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Plugin/Ringtoets.Piping.Plugin.csproj	(.../Ringtoets.Piping.Plugin.csproj)	(revision ee74bbc714b9c3d6b46e7c7734640366ef197ef6)
@@ -59,6 +59,7 @@
     <Compile Include="..\..\..\..\Core\Common\src\Core.Common.Version\GlobalAssembly.cs">
       <Link>Properties\GlobalAssembly.cs</Link>
     </Compile>
+    <Compile Include="FileImporter\RingtoetsPipingSurfaceLineReplaceDataStrategy.cs" />
     <Compile Include="FileImporter\StochasticSoilModelChangeHandler.cs" />
     <Compile Include="FileImporter\StochasticSoilModelUpdateDataStrategy.cs" />
     <Compile Include="FileImporter\StochasticSoilModelReplaceDataStrategy.cs" />
Index: Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/FileImporter/RingtoetsPipingSurfaceLineReplaceDataStrategyTest.cs
===================================================================
diff -u
--- Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/FileImporter/RingtoetsPipingSurfaceLineReplaceDataStrategyTest.cs	(revision 0)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/FileImporter/RingtoetsPipingSurfaceLineReplaceDataStrategyTest.cs	(revision ee74bbc714b9c3d6b46e7c7734640366ef197ef6)
@@ -0,0 +1,158 @@
+// Copyright (C) Stichting Deltares 2016. All rights reserved.
+//
+// This file is part of Ringtoets.
+//
+// Ringtoets is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Core.Common.Base;
+using NUnit.Framework;
+using Ringtoets.Piping.IO.Importer;
+using Ringtoets.Piping.Plugin.FileImporter;
+using Ringtoets.Piping.Primitives;
+
+namespace Ringtoets.Piping.Plugin.Test.FileImporter
+{
+    [TestFixture]
+    public class RingtoetsPipingSurfaceLineReplaceDataStrategyTest
+    {
+        [Test]
+        public void Constructor_CreatesNewInstance()
+        {
+            // Call
+            var strategy = new RingtoetsPipingSurfaceLineReplaceDataStrategy();
+
+            // Assert
+            Assert.IsInstanceOf<ISurfaceLineUpdateStrategy>(strategy);
+        }
+
+        [Test]
+        public void Constructor_TargetCollectionNull_ThrowsArgumentNullException()
+        {
+            // Setup
+            var strategy = new RingtoetsPipingSurfaceLineReplaceDataStrategy();
+
+            // Call
+            TestDelegate test = () => strategy.UpdateSurfaceLinesWithImportedData(null, Enumerable.Empty<RingtoetsPipingSurfaceLine>(), string.Empty);
+
+            // Assert
+            string paramName = Assert.Throws<ArgumentNullException>(test).ParamName;
+            Assert.AreEqual("targetCollection", paramName);
+        }
+
+        [Test]
+        public void UpdateModelWithImportedData_ReadSurfaceLinesNull_ThrowsArgumentNullException()
+        {
+            // Setup
+            var strategy = new RingtoetsPipingSurfaceLineReplaceDataStrategy();
+
+            // Call
+            TestDelegate test = () => strategy.UpdateSurfaceLinesWithImportedData(new ObservableCollectionWithSourcePath<RingtoetsPipingSurfaceLine>(),
+                                                                           null,
+                                                                           string.Empty);
+
+            // Assert
+            string paramName = Assert.Throws<ArgumentNullException>(test).ParamName;
+            Assert.AreEqual("readRingtoetsPipingSurfaceLines", paramName);
+        }
+
+        [Test]
+        public void UpdateModelWithImportedData_SourceFilePathNull_ThrowsArgumentNullException()
+        {
+            // Setup
+            var strategy = new RingtoetsPipingSurfaceLineReplaceDataStrategy();
+
+            // Call
+            TestDelegate test = () => strategy.UpdateSurfaceLinesWithImportedData(new ObservableCollectionWithSourcePath<RingtoetsPipingSurfaceLine>(),
+                                                                           Enumerable.Empty<RingtoetsPipingSurfaceLine>(),
+                                                                           null);
+
+            // Assert
+            string paramName = Assert.Throws<ArgumentNullException>(test).ParamName;
+            Assert.AreEqual("sourceFilePath", paramName);
+        }
+
+        [Test]
+        public void UpdateModelWithImportedData_DifferentSourcePath_UpdatesSourcePathOfTargetCollection()
+        {
+            // Setup 
+            var targetCollection = new ObservableCollectionWithSourcePath<RingtoetsPipingSurfaceLine>();
+
+            var strategy = new RingtoetsPipingSurfaceLineReplaceDataStrategy();
+            const string newSourcePath = "some/other/path";
+
+            // Call
+            IEnumerable<IObservable> affectedObjects = strategy.UpdateSurfaceLinesWithImportedData(targetCollection,
+                                                                                            Enumerable.Empty<RingtoetsPipingSurfaceLine>(),
+                                                                                            newSourcePath);
+
+            // Assert
+            CollectionAssert.AreEqual(new IObservable[]
+            {
+                targetCollection
+            }, affectedObjects);
+            CollectionAssert.IsEmpty(targetCollection);
+            Assert.AreEqual(newSourcePath, targetCollection.SourcePath);
+        }
+
+        [Test]
+        public void UpdateModelWithImportedData_DifferentElements_UpdatesTargetCollection()
+        {
+            // Setup
+            var targetSurfaceLine = new RingtoetsPipingSurfaceLine
+            {
+                Name = "Name A",
+            };
+            var targetCollection = new ObservableCollectionWithSourcePath<RingtoetsPipingSurfaceLine>();
+            targetCollection.AddRange(new[]
+            {
+                targetSurfaceLine
+            }, "some/path");
+
+            var readSurfaceLine = new RingtoetsPipingSurfaceLine
+            {
+                Name = "Name B"
+            };
+            var readSurfacelines = new[]
+            {
+                readSurfaceLine
+            };
+
+            var strategy = new RingtoetsPipingSurfaceLineReplaceDataStrategy();
+
+            // Call
+            IEnumerable<IObservable> affectedObjects = strategy.UpdateSurfaceLinesWithImportedData(targetCollection,
+                                                                                            readSurfacelines,
+                                                                                            "some/path");
+
+            // Assert
+            CollectionAssert.AreEqual(new IObservable[]
+            {
+                targetCollection
+            }, affectedObjects);
+
+            var expectedTargetCollection = new[]
+            {
+                readSurfaceLine
+            };
+            CollectionAssert.AreEqual(expectedTargetCollection, targetCollection);
+        }
+    }
+}
\ No newline at end of file
Index: Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/Ringtoets.Piping.Plugin.Test.csproj
===================================================================
diff -u -r0ab02f0514e081770486d6a9b1b4fbcd9c92d642 -ree74bbc714b9c3d6b46e7c7734640366ef197ef6
--- Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/Ringtoets.Piping.Plugin.Test.csproj	(.../Ringtoets.Piping.Plugin.Test.csproj)	(revision 0ab02f0514e081770486d6a9b1b4fbcd9c92d642)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/Ringtoets.Piping.Plugin.Test.csproj	(.../Ringtoets.Piping.Plugin.Test.csproj)	(revision ee74bbc714b9c3d6b46e7c7734640366ef197ef6)
@@ -72,6 +72,7 @@
     <Compile Include="..\..\..\..\Core\Common\src\Core.Common.Version\GlobalAssembly.cs">
       <Link>Properties\GlobalAssembly.cs</Link>
     </Compile>
+    <Compile Include="FileImporter\RingtoetsPipingSurfaceLineReplaceDataStrategyTest.cs" />
     <Compile Include="FileImporter\StochasticSoilModelChangeHandlerTest.cs" />
     <Compile Include="FileImporter\StochasticSoilModelUpdateExceptionTest.cs" />
     <Compile Include="FileImporter\PipingSurfaceLinesCsvImporterTest.cs" />