Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/SurfaceLineHeightAdapter.cs
===================================================================
diff -u -r4184 -r4185
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/SurfaceLineHeightAdapter.cs	(.../SurfaceLineHeightAdapter.cs)	(revision 4184)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/SurfaceLineHeightAdapter.cs	(.../SurfaceLineHeightAdapter.cs)	(revision 4185)
@@ -30,8 +30,6 @@
 /// </summary>
 public class SurfaceLineHeightAdapter : SurfaceLineAdapter
 {
-    private readonly LineHelper lineHelper = new LineHelper();
-    
     /// <summary>
     /// Initializes a new instance of the <see cref="SurfaceLineHeightAdapter"/> class.
     /// </summary>
@@ -71,7 +69,7 @@
                 X = pointAtTopRiver.X + 100,
                 Z = pointAtTopRiver.Z + 100 * Location.NewDikeSlopeOutside
             };
-            newPointAtTopRiver = lineHelper.GetIntersectionPointWithExtrapolation(pointAtTopRiver, newOutsideSlopePoint,
+            newPointAtTopRiver = LineHelper.GetIntersectionPointWithExtrapolation(pointAtTopRiver, newOutsideSlopePoint,
                                                                                   new GeometryPoint(pointAtTopRiver.X, newDikeHeight),
                                                                                   new GeometryPoint(pointAtTopPolder.X, newDikeHeight));
             oldPointAtTopRiver = new GeometryPoint
@@ -82,7 +80,7 @@
         }
         else
         {
-            newPointAtTopRiver = lineHelper.GetIntersectionPointWithExtrapolation(startingPoint, pointAtTopRiver,
+            newPointAtTopRiver = LineHelper.GetIntersectionPointWithExtrapolation(startingPoint, pointAtTopRiver,
                                                                                   new GeometryPoint(pointAtTopRiver.X, newDikeHeight),
                                                                                   new GeometryPoint(pointAtTopPolder.X, newDikeHeight));
         }
@@ -176,7 +174,7 @@
             Z = newPointAtTopPolder.Z - 100 * slopeTangent
         };
         GeometryPoint dikeTopAtPolder = surfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.DikeTopAtPolder);
-        GeometryPoint ip = lineHelper.GetIntersectionPointWithExtrapolation(newPointAtTopPolder, newPoint,
+        GeometryPoint ip = LineHelper.GetIntersectionPointWithExtrapolation(newPointAtTopPolder, newPoint,
                                                                             surfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.DikeTopAtRiver),
                                                                             dikeTopAtPolder);
         if (ip != null && ip.X <= dikeTopAtPolder.X)