Index: DamEngine/trunk/src/Deltares.DamEngine.Interface.Tests/PipingBlighTests.cs
===================================================================
diff -u -r1075 -r1080
--- DamEngine/trunk/src/Deltares.DamEngine.Interface.Tests/PipingBlighTests.cs	(.../PipingBlighTests.cs)	(revision 1075)
+++ DamEngine/trunk/src/Deltares.DamEngine.Interface.Tests/PipingBlighTests.cs	(.../PipingBlighTests.cs)	(revision 1080)
@@ -148,8 +148,16 @@
             Assert.IsNotNull(outputString);
             var output = DamXmlSerialization.LoadOutputFromXmlString(outputString);
             Assert.AreEqual(10, output.Results.CalculationResults.DesignResults.Length);
-//            Assert.AreEqual(0.7825, output.Results.CalculationResults.DesignResults[0].PipingDesignResults.BlighFactor, tolerance);
-//            Assert.AreEqual(0.8089, output.Results.CalculationResults.DesignResults[121].PipingDesignResults.BlighFactor, tolerance);
+            Assert.AreEqual(1.516, output.Results.CalculationResults.DesignResults[0].PipingDesignResults.BlighFactor, tolerance);
+            Assert.AreEqual(1.497, output.Results.CalculationResults.DesignResults[1].PipingDesignResults.BlighFactor, tolerance);
+            Assert.AreEqual(1.313, output.Results.CalculationResults.DesignResults[2].PipingDesignResults.BlighFactor, tolerance);
+            Assert.AreEqual(1.295, output.Results.CalculationResults.DesignResults[3].PipingDesignResults.BlighFactor, tolerance);
+            Assert.AreEqual(2.166, output.Results.CalculationResults.DesignResults[4].PipingDesignResults.BlighFactor, tolerance);
+            Assert.AreEqual(1.312, output.Results.CalculationResults.DesignResults[5].PipingDesignResults.BlighFactor, tolerance);
+            Assert.AreEqual(1.486, output.Results.CalculationResults.DesignResults[6].PipingDesignResults.BlighFactor, tolerance);
+            Assert.AreEqual(1.356, output.Results.CalculationResults.DesignResults[7].PipingDesignResults.BlighFactor, tolerance);
+            Assert.AreEqual(1.722, output.Results.CalculationResults.DesignResults[8].PipingDesignResults.BlighFactor, tolerance);
+            Assert.AreEqual(1.311, output.Results.CalculationResults.DesignResults[9].PipingDesignResults.BlighFactor, tolerance);
         }
 
     }
Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/DesignCalculator.cs
===================================================================
diff -u -r1075 -r1080
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/DesignCalculator.cs	(.../DesignCalculator.cs)	(revision 1075)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/DesignCalculator.cs	(.../DesignCalculator.cs)	(revision 1080)
@@ -284,11 +284,12 @@
                                                      List<LogMessage> calculationMessages, List<DesignResult> designCalculations)
         {
             var designResults = new List<DesignResult>();
+            var location = damKernelInput.Location;
+            var surfaceLine = location.SurfaceLine;
+            var orgSurfaceLine = surfaceLine;
             try
             {
                 List<LogMessage> locationCalculationMessages = new List<LogMessage>();
-                var location = damKernelInput.Location;
-                var surfaceLine = location.SurfaceLine;
                 double orgShoulderLength = surfaceLine.DetermineShoulderWidth();
                 double orgShoulderHeight = surfaceLine.DetermineShoulderHeight();
 
@@ -367,6 +368,7 @@
             }
             finally
             {
+                damKernelInput.Location.SurfaceLine = orgSurfaceLine;
                 foreach (var designResult in designResults)
                 {
                     designCalculations.Add(designResult);
Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamPipingBligh/DamPipingBlighKernelWrapper.cs
===================================================================
diff -u -r1070 -r1080
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamPipingBligh/DamPipingBlighKernelWrapper.cs	(.../DamPipingBlighKernelWrapper.cs)	(revision 1070)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamPipingBligh/DamPipingBlighKernelWrapper.cs	(.../DamPipingBlighKernelWrapper.cs)	(revision 1080)
@@ -334,9 +334,13 @@
                 double xEntry = surfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.DikeToeAtRiver).X;
                 double xExit = upliftLocationAndResult.X;
                 damPipingBlighInput.SeepageLength = xExit - xEntry;
+                var topLevelAquifer = soilProfile.GetLayerWithName(upliftLocationAndResult.LayerWhereUpliftOccuresId).TopLevel;
+                double dCoverLayer = DamPipingHelper.DetermineHeightCoverLayer(topLevelAquifer, point.Z); // point.Z is surfacelevel
+                damPipingBlighInput.DTotal = dCoverLayer;
+                var referenceLevel = Math.Max(location.PolderLevel, point.Z); // point.Z is surfacelevel
+                damPipingBlighInput.HExit = referenceLevel;
                 // Calculate the piping safety factor using the level of the given point
                 PerformSingleCalculationBligh(out messages, damPipingBlighOutput, damPipingBlighInput);
-                //var sp = CalculatePipingFactorAtLevel(location, waterLevel, point.Z);
 
                 // If too low, then determine required height and length (from uplift)
                 if (damPipingBlighOutput.FoSp < requiredFoS)