Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/DerivedPipingInput.cs
===================================================================
diff -u -r06abcaadc2936c0bf3fde73916c051f37f698505 -r1a74778bb0981ce2bcc6ca7aba097831365bbb24
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/DerivedPipingInput.cs	(.../DerivedPipingInput.cs)	(revision 06abcaadc2936c0bf3fde73916c051f37f698505)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/DerivedPipingInput.cs	(.../DerivedPipingInput.cs)	(revision 1a74778bb0981ce2bcc6ca7aba097831365bbb24)
@@ -49,7 +49,7 @@
         {
             if (input == null)
             {
-                throw new ArgumentNullException("input", "Cannot create DerivedPipingInput without PipingInput.");
+                throw new ArgumentNullException("input", @"Cannot create DerivedPipingInput without PipingInput.");
             }
             this.input = input;
         }
@@ -63,7 +63,7 @@
             {
                 return input.HydraulicBoundaryLocation == null ?
                            new RoundedDouble(2, double.NaN) :
-                           new RoundedDouble(2, input.HydraulicBoundaryLocation.DesignWaterLevel);
+                           input.HydraulicBoundaryLocation.DesignWaterLevel;
             }
         }