Index: Application/Ringtoets/src/Application.Ringtoets.Storage/Application.Ringtoets.Storage.csproj
===================================================================
diff -u -r24abd892006b14b66532bf51acf9c1e987aa404e -r993abad2c25b543f2fce10da1646f98da880a54b
--- Application/Ringtoets/src/Application.Ringtoets.Storage/Application.Ringtoets.Storage.csproj	(.../Application.Ringtoets.Storage.csproj)	(revision 24abd892006b14b66532bf51acf9c1e987aa404e)
+++ Application/Ringtoets/src/Application.Ringtoets.Storage/Application.Ringtoets.Storage.csproj	(.../Application.Ringtoets.Storage.csproj)	(revision 993abad2c25b543f2fce10da1646f98da880a54b)
@@ -376,6 +376,7 @@
     <Compile Include="Read\ClosingStructures\ClosingStructuresCalculationEntityReadExtensions.cs" />
     <Compile Include="Read\ClosingStructures\ClosingStructuresFailureMechanismMetaEntityReadExtensions.cs" />
     <Compile Include="Read\DuneErosion\DuneErosionFailureMechanismMetaEntityReadExtensions.cs" />
+    <Compile Include="Create\DuneErosion\DuneLocationCalculationCollectionCreateExtensions.cs" />
     <Compile Include="Read\DuneErosion\DuneLocationCalculationEntityReadExtensions.cs" />
     <Compile Include="Read\DuneErosion\DuneLocationEntityReadExtensions.cs" />
     <Compile Include="Read\DuneErosion\DuneLocationOutputEntityReadExtensions.cs" />
Index: Application/Ringtoets/src/Application.Ringtoets.Storage/Create/DuneErosion/DuneLocationCalculationCollectionCreateExtensions.cs
===================================================================
diff -u
--- Application/Ringtoets/src/Application.Ringtoets.Storage/Create/DuneErosion/DuneLocationCalculationCollectionCreateExtensions.cs	(revision 0)
+++ Application/Ringtoets/src/Application.Ringtoets.Storage/Create/DuneErosion/DuneLocationCalculationCollectionCreateExtensions.cs	(revision 993abad2c25b543f2fce10da1646f98da880a54b)
@@ -0,0 +1,66 @@
+// Copyright (C) Stichting Deltares 2017. 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 Application.Ringtoets.Storage.DbContext;
+using Ringtoets.DuneErosion.Data;
+
+namespace Application.Ringtoets.Storage.Create.DuneErosion
+{
+    /// <summary>
+    /// Extension methods for collections of <see cref="DuneLocationCalculation"/> related to creating a 
+    /// <see cref="DuneLocationCalculationCollectionEntity"/>.
+    /// </summary>
+    internal static class DuneLocationCalculationCollectionCreateExtensions
+    {
+        /// <summary>
+        /// Creates a <see cref="DuneLocationCalculationCollectionEntity"/> based on the information
+        /// of the <paramref name="calculations"/>.
+        /// </summary>
+        /// <param name="calculations">The collection of <see cref="DuneLocationCalculation"/>
+        /// to create a database entity for.</param>
+        /// <param name="registry">The object keeping track of create operations.</param>
+        /// <returns>A new <see cref="DuneLocationCalculationCollectionEntity"/>.</returns>
+        /// <exception cref="ArgumentNullException">Thrown when any parameter is <c>null</c>.</exception>
+        internal static DuneLocationCalculationCollectionEntity Create(this IEnumerable<DuneLocationCalculation> calculations,
+                                                                       PersistenceRegistry registry)
+        {
+            if (calculations == null)
+            {
+                throw new ArgumentNullException(nameof(calculations));
+            }
+
+            if (registry == null)
+            {
+                throw new ArgumentNullException(nameof(registry));
+            }
+
+            var collectionEntity = new DuneLocationCalculationCollectionEntity();
+            foreach (DuneLocationCalculation calculation in calculations)
+            {
+                collectionEntity.DuneLocationCalculationEntities.Add(calculation.Create(registry));
+            }
+
+            return collectionEntity;
+        }
+    }
+}
\ No newline at end of file
Index: Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Application.Ringtoets.Storage.Test.csproj
===================================================================
diff -u -r24abd892006b14b66532bf51acf9c1e987aa404e -r993abad2c25b543f2fce10da1646f98da880a54b
--- Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Application.Ringtoets.Storage.Test.csproj	(.../Application.Ringtoets.Storage.Test.csproj)	(revision 24abd892006b14b66532bf51acf9c1e987aa404e)
+++ Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Application.Ringtoets.Storage.Test.csproj	(.../Application.Ringtoets.Storage.Test.csproj)	(revision 993abad2c25b543f2fce10da1646f98da880a54b)
@@ -47,6 +47,7 @@
     <Compile Include="ColorConversionExtensionsTest.cs" />
     <Compile Include="Create\BackgroundDataCreateExtensionsTest.cs" />
     <Compile Include="Create\ClosingStructures\ClosingStructureCreateExtensionsTest.cs" />
+    <Compile Include="Create\DuneErosion\DuneLocationCalculationCollectionCreateExtensionsTest.cs" />
     <Compile Include="Create\DuneErosion\DuneLocationCalculationCreateExtensionsTest.cs" />
     <Compile Include="Create\DuneErosion\DuneLocationCreateExtensionsTest.cs" />
     <Compile Include="Create\DuneErosion\DuneLocationCalculationOutputCreateExtensionsTest.cs" />
Index: Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Create/DuneErosion/DuneLocationCalculationCollectionCreateExtensionsTest.cs
===================================================================
diff -u
--- Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Create/DuneErosion/DuneLocationCalculationCollectionCreateExtensionsTest.cs	(revision 0)
+++ Application/Ringtoets/test/Application.Ringtoets.Storage.Test/Create/DuneErosion/DuneLocationCalculationCollectionCreateExtensionsTest.cs	(revision 993abad2c25b543f2fce10da1646f98da880a54b)
@@ -0,0 +1,90 @@
+// Copyright (C) Stichting Deltares 2017. 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 Application.Ringtoets.Storage.Create;
+using Application.Ringtoets.Storage.Create.DuneErosion;
+using Application.Ringtoets.Storage.DbContext;
+using NUnit.Framework;
+using Ringtoets.DuneErosion.Data;
+using Ringtoets.DuneErosion.Data.TestUtil;
+
+namespace Application.Ringtoets.Storage.Test.Create.DuneErosion
+{
+    [TestFixture]
+    public class DuneLocationCalculationCollectionCreateExtensionsTest
+    {
+        [Test]
+        public void Create_CalculationsNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate call = () =>
+                ((IEnumerable<DuneLocationCalculation>)null).Create(new PersistenceRegistry()); 
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(call);
+            Assert.AreEqual("calculations", exception.ParamName);
+        }
+
+        [Test]
+        public void Create_RegistryNull_ThrowsArgumentNullException()
+        {
+            // Setup
+            IEnumerable<DuneLocationCalculation> calculations =
+                Enumerable.Empty<DuneLocationCalculation>();
+
+            // Call
+            TestDelegate call = () => calculations.Create(null);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(call);
+            Assert.AreEqual("registry", exception.ParamName);
+        }
+
+        [Test]
+        public void Create_WithValidCollectionAndArguments_ReturnsEntity()
+        {
+            // Setup
+            var duneLocation = new TestDuneLocation();
+            var calculation = new DuneLocationCalculation(duneLocation);
+            var calculations = new[]
+            {
+                calculation
+            };
+
+            var duneLocationEntity = new DuneLocationEntity();
+            var registry = new PersistenceRegistry();
+            registry.Register(duneLocationEntity, duneLocation);
+
+            // Call
+            DuneLocationCalculationCollectionEntity entity = calculations.Create(registry);
+
+            // Assert
+            Assert.IsNotNull(entity);
+
+            DuneLocationCalculationEntity calculationEntity = entity.DuneLocationCalculationEntities.Single();
+            Assert.AreSame(duneLocationEntity, calculationEntity.DuneLocationEntity);
+            CollectionAssert.IsEmpty(calculationEntity.DuneLocationOutputEntities);
+        }
+    }
+}
\ No newline at end of file