Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilProfile2DSurfaceLineHelper.cs
===================================================================
diff -u -r4759 -r4764
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilProfile2DSurfaceLineHelper.cs	(.../SoilProfile2DSurfaceLineHelper.cs)	(revision 4759)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilProfile2DSurfaceLineHelper.cs	(.../SoilProfile2DSurfaceLineHelper.cs)	(revision 4764)
@@ -19,6 +19,7 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
 using System.Linq;
 
 namespace Deltares.DamEngine.Data.Geotechnics;
@@ -36,18 +37,24 @@
     /// <returns></returns>
     public static bool IsSurfaceLineInsideSoilProfile2D(SurfaceLine2 surfaceLine, SoilProfile2D soilProfile2D)
     {
+        const int precisionDecimals = 3;
         if (soilProfile2D == null)
         {
             return false;
         }
-        if (surfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.SurfaceLevelOutside).X < soilProfile2D.Geometry.SurfaceLine.Points.First().X)
+
+        if (Math.Round(surfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.SurfaceLevelOutside).X, precisionDecimals) <
+            Math.Round(soilProfile2D.Geometry.SurfaceLine.Points.First().X, precisionDecimals))
         {
             return false;
         }
-        if (surfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.SurfaceLevelInside).X > soilProfile2D.Geometry.SurfaceLine.Points.Last().X)
+
+        if (Math.Round(surfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.SurfaceLevelInside).X, precisionDecimals) >
+            Math.Round(soilProfile2D.Geometry.SurfaceLine.Points.Last().X, precisionDecimals))
         {
             return false;
         }
+
         return true;
     }
 }
\ No newline at end of file