Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/PlLinesCreator/PlLinesCreator.cs
===================================================================
diff -u -r6851 -r6866
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/PlLinesCreator/PlLinesCreator.cs	(.../PlLinesCreator.cs)	(revision 6851)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/PlLinesCreator/PlLinesCreator.cs	(.../PlLinesCreator.cs)	(revision 6866)
@@ -438,13 +438,14 @@
     private bool IsPenetrationZoneCompletelyWithinInfiltrationZoneFor1DGeometry(double penetrationLength)
     {
         SoilProfile1D relevantSoilProfile = GetRelevantSoilProfileForAquiferLayersSearch();
-        // The infiltration layers are the aquitards situated between the bottom aquifer and:
+        double bottomLevelLowestInBetweenAquiferCluster = relevantSoilProfile.GetInBetweenAquiferClusters.Last().Item2.TopLevel;
+        double topLevelBottomAquifer = relevantSoilProfile.BottomAquiferLayer.TopLevel;
+        // The infiltration layers are the aquitards situated between the bottom aquifer (topLevelBottomAquifer) and:
         // - the surface line if no in-between aquifer is present
-        // - the lowest in-between aquifer if at least one in-between aquifer is present
+        // - the lowest in-between aquifer (bottomLevelLowestInBetweenAquiferCluster) if at least one in-between aquifer is present
         IList<SoilLayer1D> infiltrationLayers = (from SoilLayer1D layer in relevantSoilProfile.Layers
-                                                 where (relevantSoilProfile.InBetweenAquiferLayer == null || layer.TopLevel < relevantSoilProfile.GetInBetweenAquiferClusters.Last().Item2.TopLevel) &&
-                                                       layer.TopLevel > relevantSoilProfile.BottomAquiferLayer.TopLevel
-                                                 select layer).ToList();
+                                                 where (relevantSoilProfile.InBetweenAquiferLayer == null || layer.TopLevel < bottomLevelLowestInBetweenAquiferCluster) &&
+                                                       layer.TopLevel > topLevelBottomAquifer select layer).ToList();
 
         if (infiltrationLayers.Count > 0)
         {