Index: dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamPipingSellmeijer4Forces/DamPipingSellmeijer4ForcesKernelWrapper.cs
===================================================================
diff -u -r672 -r680
--- dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamPipingSellmeijer4Forces/DamPipingSellmeijer4ForcesKernelWrapper.cs	(.../DamPipingSellmeijer4ForcesKernelWrapper.cs)	(revision 672)
+++ dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamPipingSellmeijer4Forces/DamPipingSellmeijer4ForcesKernelWrapper.cs	(.../DamPipingSellmeijer4ForcesKernelWrapper.cs)	(revision 680)
@@ -36,7 +36,7 @@
                 var surfaceLine = damKernelInput.Location.SurfaceLine;
                 var location = damKernelInput.Location;
                 var riverLevel = damKernelInput.DesignScenario.RiverLevel;
-                var plLines = DamPipingHelper.CreatePlLines(location, soilProfile1D, riverLevel);
+                var plLines = PlLinesHelper.CreatePlLines(location, soilProfile1D, riverLevel);
                 var upliftLocationDeterminator = new UpliftLocationDeterminator
                 {
                     PLLines = plLines,
Index: dam engine/trunk/src/Deltares.DamEngine.Calculators/Deltares.DamEngine.Calculators.csproj
===================================================================
diff -u -r624 -r680
--- dam engine/trunk/src/Deltares.DamEngine.Calculators/Deltares.DamEngine.Calculators.csproj	(.../Deltares.DamEngine.Calculators.csproj)	(revision 624)
+++ dam engine/trunk/src/Deltares.DamEngine.Calculators/Deltares.DamEngine.Calculators.csproj	(.../Deltares.DamEngine.Calculators.csproj)	(revision 680)
@@ -87,6 +87,7 @@
     <Compile Include="Interfaces\DGSStandardDLLInterface.cs" />
     <Compile Include="KernelWrappers\Common\DamKernelInput.cs" />
     <Compile Include="KernelWrappers\Common\DamPipingHelper.cs" />
+    <Compile Include="KernelWrappers\Common\PlLinesHelper.cs" />
     <Compile Include="KernelWrappers\DamMacroStability\Assemblers\AssemblyExtensions.cs" />
     <Compile Include="KernelWrappers\DamMacroStability\Assemblers\Common.cs" />
     <Compile Include="KernelWrappers\DamMacroStability\Assemblers\DamMStabAssembler.cs" />
Index: dam engine/trunk/src/Deltares.DamEngine.Calculators.Tests/KernelWrappers/Common/DamPipingHelperTests.cs
===================================================================
diff -u
--- dam engine/trunk/src/Deltares.DamEngine.Calculators.Tests/KernelWrappers/Common/DamPipingHelperTests.cs	(revision 0)
+++ dam engine/trunk/src/Deltares.DamEngine.Calculators.Tests/KernelWrappers/Common/DamPipingHelperTests.cs	(revision 680)
@@ -0,0 +1,28 @@
+using System;
+using Deltares.DamEngine.Calculators.KernelWrappers.Common;
+using NUnit.Framework;
+
+namespace Deltares.DamEngine.Calculators.Tests.KernelWrappers.Common
+{
+    [TestFixture]
+    public class DamPipingHelperTests
+    {
+        [Test]
+        public void TestDetermineHeightCoverLayer()
+        {
+            // Top of aquifer is below surface level
+            var topLevelAquifer = 3.0;
+            var surfaceLevel = 5.0;
+            // expected height = 5 - 3 = 2
+            var height = DamPipingHelper.DetermineHeightCoverLayer(topLevelAquifer, surfaceLevel);
+            Assert.AreEqual(2.0, height);
+
+            // Top of aquifer is above surface level
+            topLevelAquifer = 3.0;
+            surfaceLevel = 1.0;
+            // expected height = 0
+            height = DamPipingHelper.DetermineHeightCoverLayer(topLevelAquifer, surfaceLevel);
+            Assert.AreEqual(0.0, height);
+        }
+    }
+}
Index: dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamPipingBligh/DamPipingBlighKernelWrapper.cs
===================================================================
diff -u -r674 -r680
--- dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamPipingBligh/DamPipingBlighKernelWrapper.cs	(.../DamPipingBlighKernelWrapper.cs)	(revision 674)
+++ dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamPipingBligh/DamPipingBlighKernelWrapper.cs	(.../DamPipingBlighKernelWrapper.cs)	(revision 680)
@@ -38,7 +38,7 @@
                 var surfaceLine = damKernelInput.Location.SurfaceLine;
                 var location = damKernelInput.Location;
                 double riverLevel = damKernelInput.DesignScenario.RiverLevel;
-                var plLines = DamPipingHelper.CreatePlLines(location, soilProfile1D, riverLevel);
+                var plLines = PlLinesHelper.CreatePlLines(location, soilProfile1D, riverLevel);
                 UpliftLocationDeterminator upliftLocationDeterminator = new UpliftLocationDeterminator
                 {
                     PLLines = plLines,
Index: dam engine/trunk/src/Deltares.DamEngine.Calculators.Tests/Deltares.DamEngine.Calculators.Tests.csproj
===================================================================
diff -u -r643 -r680
--- dam engine/trunk/src/Deltares.DamEngine.Calculators.Tests/Deltares.DamEngine.Calculators.Tests.csproj	(.../Deltares.DamEngine.Calculators.Tests.csproj)	(revision 643)
+++ dam engine/trunk/src/Deltares.DamEngine.Calculators.Tests/Deltares.DamEngine.Calculators.Tests.csproj	(.../Deltares.DamEngine.Calculators.Tests.csproj)	(revision 680)
@@ -44,6 +44,7 @@
     <Reference Include="System.Xml.Linq" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="KernelWrappers\Common\DamPipingHelperTests.cs" />
     <Compile Include="KernelWrappers\DamMacroStability\DamMacroStabilityKernelWrapperTests.cs" />
     <Compile Include="KernelWrappers\DamPipingSellmeijer4Forces\DamPipingSellmeijer4ForcesKernelWrapperTests.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
@@ -63,6 +64,7 @@
       <Link>Copying.AGPL.licenseheader</Link>
     </None>
   </ItemGroup>
+  <ItemGroup />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
Index: dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/Common/PlLinesHelper.cs
===================================================================
diff -u
--- dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/Common/PlLinesHelper.cs	(revision 0)
+++ dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/Common/PlLinesHelper.cs	(revision 680)
@@ -0,0 +1,50 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Deltares.DamEngine.Calculators.PlLinesCreator;
+using Deltares.DamEngine.Data.General;
+using Deltares.DamEngine.Data.General.PlLines;
+using Deltares.DamEngine.Data.Geotechnics;
+
+namespace Deltares.DamEngine.Calculators.KernelWrappers.Common
+{
+    /// <summary>
+    /// Helper for Pl Lines
+    /// </summary>
+    public class PlLinesHelper
+    {
+        /// <summary>
+        /// Creates the pl lines.
+        /// </summary>
+        /// <param name="location">The location.</param>
+        /// <param name="soilProfile">The soil profile.</param>
+        /// <param name="waterLevel">The water level.</param>
+        /// <returns></returns>
+        public static PLLines CreatePlLines(Location location, SoilProfile1D soilProfile, double waterLevel)
+        {
+            var plLineCreator = new PLLinesCreator
+            {
+                WaterLevelRiverHigh = waterLevel,
+                SurfaceLine = location.SurfaceLine,
+                WaterLevelPolder = location.PolderLevel,
+                HeadInPLLine2 = location.HeadPl2,
+                HeadInPLLine3 = location.HeadPl3,
+                HeadInPLLine4 = location.HeadPl4,
+                ModelParametersForPLLines = location.ModelParametersForPLLines,
+                SoilProfile = soilProfile,
+                GaugePLLines = null, // TODO: Operational
+                Gauges = null, // TODO: Operational
+                IsAdjustPL3AndPL4SoNoUpliftWillOccurEnabled = false, // for piping this must be set to false
+                PlLineOffsetBelowDikeTopAtRiver = location.PlLineOffsetBelowDikeTopAtRiver,
+                PlLineOffsetBelowDikeTopAtPolder = location.PlLineOffsetBelowDikeTopAtPolder,
+                DikeEmbankmentMaterial = location.GetDikeEmbankmentSoil(),
+                IsHydraulicShortcut = false, // TODO: Regional
+                XSoilGeometry2DOrigin = location.XSoilGeometry2DOrigin
+            };
+            return plLineCreator.CreateAllPLLines(location);
+        }
+
+    }
+}
Index: dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/Common/DamPipingHelper.cs
===================================================================
diff -u -r677 -r680
--- dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/Common/DamPipingHelper.cs	(.../DamPipingHelper.cs)	(revision 677)
+++ dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/Common/DamPipingHelper.cs	(.../DamPipingHelper.cs)	(revision 680)
@@ -1,49 +1,13 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using Deltares.DamEngine.Calculators.PlLinesCreator;
-using Deltares.DamEngine.Data.General;
-using Deltares.DamEngine.Data.General.PlLines;
-using Deltares.DamEngine.Data.Geotechnics;
 
 namespace Deltares.DamEngine.Calculators.KernelWrappers.Common
 {
+    /// <summary>
+    /// Helper for Dam Piping kernels
+    /// </summary>
     public static class DamPipingHelper
     {
         /// <summary>
-        /// Creates the pl lines.
-        /// </summary>
-        /// <param name="location">The location.</param>
-        /// <param name="soilProfile">The soil profile.</param>
-        /// <param name="waterLevel">The water level.</param>
-        /// <returns></returns>
-        public static PLLines CreatePlLines(Location location, SoilProfile1D soilProfile, double waterLevel)
-        {
-            var plLineCreator = new PLLinesCreator
-            {
-                WaterLevelRiverHigh = waterLevel,
-                SurfaceLine = location.SurfaceLine,
-                WaterLevelPolder = location.PolderLevel,
-                HeadInPLLine2 = location.HeadPl2,
-                HeadInPLLine3 = location.HeadPl3,
-                HeadInPLLine4 = location.HeadPl4,
-                ModelParametersForPLLines = location.ModelParametersForPLLines,
-                SoilProfile = soilProfile,
-                GaugePLLines = null, // TODO: Operational
-                Gauges = null, // TODO: Operational
-                IsAdjustPL3AndPL4SoNoUpliftWillOccurEnabled = false, // for piping this must be set to false
-                PlLineOffsetBelowDikeTopAtRiver = location.PlLineOffsetBelowDikeTopAtRiver,
-                PlLineOffsetBelowDikeTopAtPolder = location.PlLineOffsetBelowDikeTopAtPolder,
-                DikeEmbankmentMaterial = location.GetDikeEmbankmentSoil(),
-                IsHydraulicShortcut = false, // TODO: Regional
-                XSoilGeometry2DOrigin = location.XSoilGeometry2DOrigin
-            };
-            return plLineCreator.CreateAllPLLines(location);
-        }
-
-        /// <summary>
         /// Determines the total thickness of the cover layer.
         /// </summary>
         /// <param name="topLevelAquifer">The top level aquifer.</param>