Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/CsvImporters/CsvImporterAquifers.cs
===================================================================
diff -u
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/CsvImporters/CsvImporterAquifers.cs	(revision 0)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/CsvImporters/CsvImporterAquifers.cs	(revision 4926)
@@ -0,0 +1,121 @@
+// Copyright (C) Stichting Deltares 2024. All rights reserved.
+// 
+// This file is part of the application DAM - UI.
+// 
+// DAM - UI 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.Globalization;
+using System.IO;
+using System.Threading;
+using Deltares.Dam.Data.Importers;
+using Deltares.Standard.IO;
+using Deltares.Standard.Language;
+using LumenWorks.Framework.IO.Csv;
+
+namespace Deltares.Dam.Data.CsvImporters;
+
+public class CsvImporterAquifersException : ApplicationException
+{
+    public CsvImporterAquifersException(string message)
+        : base(message) {}
+}
+
+public class CsvImporterAquifers
+{
+    public CsvImporterAquifers(string fileName)
+    {
+        ErrorMessages.Clear();
+        ThrowHelper.ThrowIfStringArgumentNullOrEmpty(fileName, StringResourceNames.CsvFileNotValid);
+        ThrowHelper.ThrowIfFileNotExist(fileName, StringResourceNames.CsvFileNotFound);
+
+        CultureInfo oldCultureInfo = Thread.CurrentThread.CurrentCulture;
+        try
+        {
+            Thread.CurrentThread.CurrentCulture = CsvReaderUtilities.DetermineCultureForFile(fileName);
+            using (var csv = new CsvReader(new StreamReader(fileName), true, ';'))
+            {
+                string[] headers = CsvImporterHelper.GetFieldHeaders(this, csv);
+                if (headers.Length != 2)
+                {
+                    string csvHeaderError = LocalizationManager.GetTranslatedText(GetType(), "csvHeaderError");
+                    throw new CsvImporterAquifersException($"{fileName} : {csvHeaderError}");
+                }
+
+                const string fieldStixFilename = "stix_filename";
+                int colIndexStixFilename = CsvReaderUtilities.GetHeaderIndexByString(headers, fieldStixFilename);
+                CheckColumn(colIndexStixFilename, fileName, fieldStixFilename);
+
+                const string fieldLayerName = "layer_name";
+                int colIndexLayerName = CsvReaderUtilities.GetHeaderIndexByString(headers, fieldLayerName);
+                CheckColumn(colIndexLayerName, fileName, fieldLayerName);
+
+                var index = 1;
+                while (csv.ReadNextRecord())
+                {
+                    var aquiferRecord = new AquiferRecord();
+                    int colIndex = -1; // Keep track of column for error message
+                    try
+                    {
+                        aquiferRecord.AquiferRecordId = index;
+                        index++;
+
+                        // Required columns
+                        colIndex = colIndexStixFilename;
+                        aquiferRecord.StixFileName = csv[colIndexStixFilename];
+                        colIndex = colIndexLayerName;
+                        aquiferRecord.LayerName = csv[colIndexLayerName];
+
+                        ImportedItems.Add(aquiferRecord);
+                    }
+                    catch (Exception e)
+                    {
+                        string csvAquiferError = string.Format(LocalizationManager.GetTranslatedText(GetType(), "csvAquiferError"), 
+                                                               aquiferRecord.StixFileName, colIndex + 1);
+                        ErrorMessages.Add($"Record {index} : {csvAquiferError + e.Message}");
+                    }
+                }
+            }
+        }
+        finally
+        {
+            Thread.CurrentThread.CurrentCulture = oldCultureInfo;
+        }
+    }
+
+    public List<AquiferRecord> ImportedItems { get; } = new();
+
+    public List<string> ErrorMessages { get; set; } = new();
+
+    private void CheckColumn(int index, string fileName, string fieldName)
+    {
+        if (index < 0)
+        {
+            string csvHeaderFieldError = LocalizationManager.GetTranslatedText(GetType(), "csvHeaderFieldError");
+            throw new CsvImporterAquifersException($"{fileName} : {csvHeaderFieldError}{fieldName}");
+        }
+    }
+
+    public class AquiferRecord
+    {
+        public int AquiferRecordId { get; set; }
+        public string StixFileName { get; set; }
+        public string LayerName { get; set; }
+    }
+}
\ No newline at end of file
Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/CsvImporters/CsvImporter.cs
===================================================================
diff -u -r4795 -r4926
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/CsvImporters/CsvImporter.cs	(.../CsvImporter.cs)	(revision 4795)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/CsvImporters/CsvImporter.cs	(.../CsvImporter.cs)	(revision 4926)
@@ -35,6 +35,7 @@
     private const string locationsFileNamePart = "locations";
     private const string segmentsFileNamePart = "segments";
     private const string soilProfilesFileNamePart = "soilprofiles";
+    private const string aquifersFileNamePart = "aquifers";
     private const string surfaceLinesFileNamePart = "surfacelines";
     private const string characteristicPointFileNamePart = "characteristicpoints";
     private const string scenariosFileNamePart = "scenarios";
@@ -51,6 +52,8 @@
     public List<CsvImporterCharacteristicPoints.CharacteristicPointsRecord> CharacteristicPointsRecords { get; private set; } = new();
 
     public List<CsvImporterSoilProfiles.SoilProfileRecord> SoilProfilesRecords { get; private set; } = new();
+    
+    public List<CsvImporterAquifers.AquiferRecord> AquifersRecords { get; private set; } = new();
 
     public List<CsvImporterSurfaceLines.SurfaceLineRecord> SurfaceLinesRecords { get; private set; } = new();
 
@@ -88,6 +91,9 @@
             ImportSoilProfiles(SoilProfilesFileName);
             progress?.Invoke(0.2);
 
+            ImportAquifers(AquifersFileName);
+            progress?.Invoke(0.2);
+
             ImportSurfaceLines(SurfaceLinesFileName);
             // Scenario file is required for design projects and optional for the rest
             if (damProjectType == DamProjectType.Design)
@@ -134,6 +140,8 @@
     private string SegmentsFileName => string.Format(filePattern, ImportFolderLocation, segmentsFileNamePart);
 
     private string SoilProfilesFileName => string.Format(filePattern, ImportFolderLocation, soilProfilesFileNamePart);
+    
+    private string AquifersFileName => string.Format(filePattern, ImportFolderLocation, aquifersFileNamePart);
 
     private string SurfaceLinesFileName => string.Format(filePattern, ImportFolderLocation, surfaceLinesFileNamePart);
 
@@ -246,6 +254,33 @@
     }
 
     /// <summary>
+    ///     Imports the aquifers.
+    /// </summary>
+    /// <param name="fileName">Name of the file.</param>
+    private void ImportAquifers(string fileName)
+    {
+        // Only necessary for 2D-geometries
+        if (File.Exists(fileName))
+        {
+            try
+            {
+                var csvImportAquifers = new CsvImporterAquifers(fileName);
+                AquifersRecords = csvImportAquifers.ImportedItems;
+                foreach (string errorMessage in csvImportAquifers.ErrorMessages)
+                {
+                    var logMessage = new LogMessage(LogMessageType.Error, this, errorMessage);
+                    ErrorMessages.Add(logMessage);
+                }
+            }
+            catch (Exception e)
+            {
+                var logMessage = new LogMessage(LogMessageType.FatalError, this, e.Message);
+                ErrorMessages.Add(logMessage);
+            }
+        }
+    }
+
+    /// <summary>
     ///     Imports the surface lines.
     /// </summary>
     /// <param name="fileName">Name of the file.</param>
Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/DataPlugins/DataPluginImporter.cs
===================================================================
diff -u -r4813 -r4926
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/DataPlugins/DataPluginImporter.cs	(.../DataPluginImporter.cs)	(revision 4813)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/DataPlugins/DataPluginImporter.cs	(.../DataPluginImporter.cs)	(revision 4926)
@@ -1204,6 +1204,7 @@
                 ScenarioRecords = csvImporter.ScenariosRecords,
                 SegmentRecords = csvImporter.SegmentRecords,
                 SoilProfilerecords = csvImporter.SoilProfilesRecords,
+                AquiferRecords = csvImporter.AquifersRecords,
                 SurfaceLineRecords = csvImporter.SurfaceLinesRecords,
                 SoilRecords = csvImporter.SoilsRecords,
                 SigmaTauCurveRecords = csvImporter.SigmaTauCurvesRecords
Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/IO/CombineImportedData.cs
===================================================================
diff -u -r4569 -r4926
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/IO/CombineImportedData.cs	(.../CombineImportedData.cs)	(revision 4569)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/IO/CombineImportedData.cs	(.../CombineImportedData.cs)	(revision 4926)
@@ -69,6 +69,11 @@
     public IEnumerable<CsvImporterSoilProfiles.SoilProfileRecord> SoilProfilerecords { get; set; }
 
     /// <summary>
+    /// The Aquifer records.
+    /// </summary>
+    public IEnumerable<CsvImporterAquifers.AquiferRecord> AquiferRecords { get; set; }
+    
+    /// <summary>
     /// The SurfaceLine records.
     /// </summary>
     public IEnumerable<CsvImporterSurfaceLines.SurfaceLineRecord> SurfaceLineRecords { get; set; }
@@ -115,6 +120,7 @@
         {
             TransferLocationsData(dike);
             TransferSoilProfilesData(dike);
+            TransferAquifersData(dike);
             TransferSegmentData(dike);
             TransferSigmaTauCurveData(dike); // Should be done before TransferSoilData(), because the SigmaTauCurveData is used there
             TransferSoilData(dike);
@@ -565,6 +571,11 @@
         }
     }
 
+    private void TransferAquifersData(Dike dike)
+    {
+    // ToDo: Aquifers
+    }
+    
     private void TransferSurfaceLines(Dike dike)
     {
         if (SurfaceLineRecords == null)
Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/Translations.xml
===================================================================
diff -u -r4771 -r4926
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/Translations.xml	(.../Translations.xml)	(revision 4771)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.Data/Translations.xml	(.../Translations.xml)	(revision 4926)
@@ -363,6 +363,9 @@
     <Translation ID="csvSoilProfileError"
                  en-US="Next error occured whilst reading soil profile {0} column {1}  from csv: "
                  nl-NL="Tijdens het lezen van 1D profiel {0} in kolom {1} uit de csv trad de volgende fout op: "/>
+    <Translation ID="csvAquiferError"
+                 en-US="Next error occured whilst reading aquifer for stix filename {0} column {1}  from csv: "
+                 nl-NL="Tijdens het lezen van watervoerende laag voor stix bestand {0} in kolom {1} uit de csv trad de volgende fout op: "/>
     <Translation ID="csvSegmentError" en-US="Next error occured whilst reading segment {0} column {1}  from csv: "
                  nl-NL="Tijdens het lezen van segment {0} in kolom {1} uit de csv trad de volgende fout op: "/>
     <Translation ID="csvScenarioError"
Index: DamClients/DamUI/trunk/src/Dam/Deltares.Dam.Tests/CsvImporterTestsNew.cs
===================================================================
diff -u -r4723 -r4926
--- DamClients/DamUI/trunk/src/Dam/Deltares.Dam.Tests/CsvImporterTestsNew.cs	(.../CsvImporterTestsNew.cs)	(revision 4723)
+++ DamClients/DamUI/trunk/src/Dam/Deltares.Dam.Tests/CsvImporterTestsNew.cs	(.../CsvImporterTestsNew.cs)	(revision 4926)
@@ -223,6 +223,68 @@
     }
 
     [Test]
+    public void AquifersImporterCorrectFileTest()
+    {
+        const string importFile = "aquifers.csv";
+        string testFilePath = Path.Combine(importFolder, importFile);
+        if (File.Exists(testFilePath))
+        {
+            File.Delete(testFilePath);
+        }
+
+        CreateAquifersFile(testFilePath);
+        var csvImporterAquifers = new CsvImporterAquifers(testFilePath);
+        IList<CsvImporterAquifers.AquiferRecord> aquiferRecords = csvImporterAquifers.ImportedItems;
+        
+        Assert.That(aquiferRecords, Has.Count.EqualTo(5));
+        CsvImporterAquifers.AquiferRecord aquiferRecord = aquiferRecords[0];
+        Assert.That(aquiferRecord.StixFileName, Is.EqualTo("DWP_1.stix"));
+        Assert.That(aquiferRecord.LayerName, Is.EqualTo("L1"));
+        aquiferRecord = aquiferRecords[1];
+        Assert.That(aquiferRecord.StixFileName, Is.EqualTo("DWP_1.stix"));
+        Assert.That(aquiferRecord.LayerName, Is.EqualTo("L5"));
+        aquiferRecord = aquiferRecords[2];
+        Assert.That(aquiferRecord.StixFileName, Is.EqualTo("DWP_2.stix"));
+        Assert.That(aquiferRecord.LayerName, Is.EqualTo("L1"));
+        aquiferRecord = aquiferRecords[3];
+        Assert.That(aquiferRecord.StixFileName, Is.EqualTo("DWP_2.stix"));
+        Assert.That(aquiferRecord.LayerName, Is.EqualTo("L1"));
+        aquiferRecord = aquiferRecords[4];
+        Assert.That(aquiferRecord.StixFileName, Is.EqualTo("DWP_3.stix"));
+        Assert.That(aquiferRecord.LayerName, Is.EqualTo("L2"));
+    }
+    
+    [Test]
+    public void AquifersImporterIllegalHeaderTest()
+    {
+        const string importFile = "aquifers.csv";
+        string testFilePath = Path.Combine(importFolder, importFile);
+        if (File.Exists(testFilePath))
+        {
+            File.Delete(testFilePath);
+        }
+
+        CreateAquifersFileWithIllegalHeader(testFilePath);
+        var ex = Assert.Throws<CsvImporterAquifersException>(() => new CsvImporterAquifers(testFilePath));
+        Assert.That(ex.Message, Does.Contain("The header of the csv file is wrong."));
+    }
+
+    [Test]
+    public void AquifersImporterMissingHeaderFieldTest()
+    {
+        const string importFile = "aquifers.csv";
+        string testFilePath = Path.Combine(importFolder, importFile);
+        if (File.Exists(testFilePath))
+        {
+            File.Delete(testFilePath);
+        }
+
+        CreateAquifersFileWithIllegalHeaderField(testFilePath);
+        var ex = Assert.Throws<CsvImporterAquifersException>(() => new CsvImporterAquifers(testFilePath));
+        Assert.That(ex.Message, Does.Contain("The header misses the field: layer_name"));
+    }
+        
+    [Test]
     public void CharacteristicPointsImporterCorrectFileTest()
     {
         const string importFile = "characteristicpoints.csv";
@@ -961,6 +1023,31 @@
         writer.WriteLine("1DP2;-5.3;Alg-zand (0-30);True");
     }
 
+    private static void CreateAquifersFile(string filePath)
+    {
+        using StreamWriter writer = File.CreateText(filePath);
+        writer.WriteLine("stix_filename;layer_name");
+        writer.WriteLine("DWP_1.stix;L1");
+        writer.WriteLine("DWP_1.stix;L5");
+        writer.WriteLine("DWP_2.stix;L1");
+        writer.WriteLine("DWP_2.stix;L1");
+        writer.WriteLine("DWP_3.stix;L2");
+    }
+
+    private static void CreateAquifersFileWithIllegalHeader(string filePath)
+    {
+        using StreamWriter writer = File.CreateText(filePath);
+        writer.WriteLine("stix_filename;layer_name;aaa");
+        writer.WriteLine("DWP_1.stix;L1");
+    }
+    
+    
+    private static void CreateAquifersFileWithIllegalHeaderField(string filePath)
+    {
+        using StreamWriter writer = File.CreateText(filePath);
+        writer.WriteLine("stix_filename;aquifer_name");
+        writer.WriteLine("DWP_1.stix;L1");
+    }
     private static void CreateFullSoilsFile(string filePath)
     {
         using StreamWriter writer = File.CreateText(filePath);
Index: DamClients/DamUI/trunk/src/Dam/Deltares.Dam.Tests/IO/CombineImportedDataTest.cs
===================================================================
diff -u -r4638 -r4926
--- DamClients/DamUI/trunk/src/Dam/Deltares.Dam.Tests/IO/CombineImportedDataTest.cs	(.../CombineImportedDataTest.cs)	(revision 4638)
+++ DamClients/DamUI/trunk/src/Dam/Deltares.Dam.Tests/IO/CombineImportedDataTest.cs	(.../CombineImportedDataTest.cs)	(revision 4926)
@@ -103,6 +103,7 @@
                             SurfaceLineRecords = csvImporter.SurfaceLinesRecords,
                             SegmentRecords = csvImporter.SegmentRecords,
                             SoilProfilerecords = csvImporter.SoilProfilesRecords,
+                            AquiferRecords = csvImporter.AquifersRecords,
                             ScenarioRecords = csvImporter.ScenariosRecords,
                             LocationRecords = csvImporter.LocationRecords
                         };
@@ -189,6 +190,7 @@
                     SurfaceLineRecords = csvImporter.SurfaceLinesRecords,
                     SegmentRecords = csvImporter.SegmentRecords,
                     SoilProfilerecords = csvImporter.SoilProfilesRecords,
+                    AquiferRecords = csvImporter.AquifersRecords,
                     ScenarioRecords = csvImporter.ScenariosRecords,
                     SoilRecords = csvImporter.SoilsRecords,
                     SigmaTauCurveRecords = csvImporter.SigmaTauCurvesRecords