Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/PlLinesCreator/SensorPlLineCreatorBase.cs
===================================================================
diff -u -r4540 -r5658
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/PlLinesCreator/SensorPlLineCreatorBase.cs	(.../SensorPlLineCreatorBase.cs)	(revision 4540)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/PlLinesCreator/SensorPlLineCreatorBase.cs	(.../SensorPlLineCreatorBase.cs)	(revision 5658)
@@ -201,15 +201,10 @@
     /// Intersection of line at river with a given Z value.
     /// </summary>
     /// <returns></returns>
-    protected double IntersectionXAtRiverWaterLevel(double waterLevel)
+    protected double? IntersectionXAtRiverWaterLevel(double waterLevel)
     {
         GeometryPoint point = SensorLocation.SurfaceLine.DetermineIntersectionBetweenTaludRiverSideAndWaterLevel(waterLevel);
-        if (point == null)
-        {
-            throw new PlLinesCreatorException("No intersection point found with water level at dike river side");
-        }
-
-        return point.X;
+        return point?.X;
     }
 
     /// <summary>
Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/PlLinesCreator/SensorPlLine1Creator.cs
===================================================================
diff -u -r5653 -r5658
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/PlLinesCreator/SensorPlLine1Creator.cs	(.../SensorPlLine1Creator.cs)	(revision 5653)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/PlLinesCreator/SensorPlLine1Creator.cs	(.../SensorPlLine1Creator.cs)	(revision 5658)
@@ -234,9 +234,6 @@
             throw new PlLinesCreatorException("There was an error trying to read the water level", e);
         }
 
-        // Waterlevel MUST be above of Dike Toe At River Side, if not, an error is thrown
-        SensorLocation.SurfaceLine.CheckWaterLevelIsAboveDikeToeRiverSide(waterLevel);
-
         // Add begin boundary
         lineConstructor.Insert(new PlLinePoint(XBeginBoundary, waterLevel));
 
@@ -257,11 +254,20 @@
         }
 
         // insert intersection point (at dike river side)
-        double xIntersection = IntersectionXAtRiverWaterLevel(waterLevel);
-        lineConstructor.Insert(new PlLinePoint(xIntersection, waterLevel)
+        double? xIntersection = IntersectionXAtRiverWaterLevel(waterLevel);
+        if (xIntersection != null)
         {
-            Name = "Intersection point dike river side"
-        });
+            lineConstructor.Insert(new PlLinePoint(xIntersection.Value, waterLevel)
+            {
+                Name = "Intersection point dike river side"
+            });
+        }
+        else
+        {
+            GeometryPoint dikeToeAtRiver = SensorLocation.SurfaceLine.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.DikeToeAtRiver);
+            var point = new PlLinePoint(dikeToeAtRiver.X, dikeToeAtRiver.Z);
+            lineConstructor.Insert(point);
+        }
 
         // insert offset below dike top at river point?
         var useLocationAsDataSource = new UseLocationAsDataSource();