Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/SurfaceLineAdapter.cs
===================================================================
diff -u -r5773 -r5784
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/SurfaceLineAdapter.cs	(.../SurfaceLineAdapter.cs)	(revision 5773)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/SurfaceLineAdapter.cs	(.../SurfaceLineAdapter.cs)	(revision 5784)
@@ -26,6 +26,8 @@
 using Deltares.DamEngine.Data.General;
 using Deltares.DamEngine.Data.Geometry;
 using Deltares.DamEngine.Data.Geotechnics;
+using Deltares.DamEngine.Data.Standard;
+using MathNet.Numerics;
 
 namespace Deltares.DamEngine.Calculators.DikesDesign;
 
@@ -144,8 +146,8 @@
         {
             newSlopeEndPoint = intersectionpoints.First();
             // One of the intersection points can be the dike top which should not be replaced
-            if (Math.Abs(newSlopeEndPoint.X - surfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.DikeTopAtPolder).X) < GeometryConstants.Tolerance &&
-                Math.Abs(newSlopeEndPoint.Z - surfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.DikeTopAtPolder).Z) < GeometryConstants.Tolerance )
+            if (newSlopeEndPoint.X.IsNearEqual(surfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.DikeTopAtPolder).X, GeometryConstants.Tolerance) &&
+                newSlopeEndPoint.Z.IsNearEqual(surfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.DikeTopAtPolder).Z, GeometryConstants.Tolerance))
             {
                 newSlopeEndPoint = null;
                 if (intersectionpoints.Count > 1)
@@ -324,12 +326,11 @@
 
         // TODO: #the Following code is not correct; you should also look at the setting of Location.UseNewMinDistanceDikeToeStartDitch
         // First determine all coordinates
-        if (distanceToNewToe < Location.NewMinDistanceDikeToeStartDitch && 
-            Math.Abs(distanceToNewToe - ditchDefinition.Value.DistanceFromToe) > GeometryConstants.Tolerance )
+        if (distanceToNewToe.IsSmaller(Location.NewMinDistanceDikeToeStartDitch, GeometryConstants.Tolerance) && 
+            !distanceToNewToe.IsNearEqual(ditchDefinition.Value.DistanceFromToe, GeometryConstants.Tolerance))
         {
             // Ditch needs to be moved as it is less then the minimum required distance from the new toe
-            xDitchDikeSide = dikeToeAtPolder.X +
-                             Location.NewMinDistanceDikeToeStartDitch;
+            xDitchDikeSide = dikeToeAtPolder.X + Location.NewMinDistanceDikeToeStartDitch;
             if (Location.UseNewDitchDefinition)
             {
                 // Use the new definition instead of the old shape