Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Forms/Views/MacroStabilityInwardsInputView.cs
===================================================================
diff -u -rb81b32bacd7ae86b70a551dc70b0b7ad832f28b5 -r89a3621eb11e6356d1af674fca44b7769de3c54b
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Forms/Views/MacroStabilityInwardsInputView.cs	(.../MacroStabilityInwardsInputView.cs)	(revision b81b32bacd7ae86b70a551dc70b0b7ad832f28b5)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Forms/Views/MacroStabilityInwardsInputView.cs	(.../MacroStabilityInwardsInputView.cs)	(revision 89a3621eb11e6356d1af674fca44b7769de3c54b)
@@ -81,7 +81,7 @@
         /// <summary>
         /// Creates a new instance of <see cref="MacroStabilityInwardsInputView"/>.
         /// </summary>
-        /// <param name="data">The data to show in the view.</param>
+        /// <param name="data">The calculation to show the input for.</param>
         /// <param name="getNormativeAssessmentLevelFunc"><see cref="Func{TResult}"/> for obtaining the normative assessment level.</param>
         /// <exception cref="ArgumentNullException">Thrown when any input parameter is <c>null</c>.</exception>
         public MacroStabilityInwardsInputView(MacroStabilityInwardsCalculationScenario data,
Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Forms/Views/MacroStabilityInwardsOutputChartControl.cs
===================================================================
diff -u -rb81b32bacd7ae86b70a551dc70b0b7ad832f28b5 -r89a3621eb11e6356d1af674fca44b7769de3c54b
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Forms/Views/MacroStabilityInwardsOutputChartControl.cs	(.../MacroStabilityInwardsOutputChartControl.cs)	(revision b81b32bacd7ae86b70a551dc70b0b7ad832f28b5)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Forms/Views/MacroStabilityInwardsOutputChartControl.cs	(.../MacroStabilityInwardsOutputChartControl.cs)	(revision 89a3621eb11e6356d1af674fca44b7769de3c54b)
@@ -102,7 +102,7 @@
         /// <summary>
         /// Creates a new instance of <see cref="MacroStabilityInwardsOutputChartControl"/>.
         /// </summary>
-        /// <param name="data">The data to show in the view.</param>
+        /// <param name="data">The calculation to show the output for.</param>
         /// <param name="getNormativeAssessmentLevelFunc"><see cref="Func{TResult}"/> for obtaining the normative assessment level.</param>
         /// <exception cref="ArgumentNullException">Thrown when any input parameter is <c>null</c>.</exception>
         public MacroStabilityInwardsOutputChartControl(MacroStabilityInwardsCalculationScenario data,
@@ -301,7 +301,7 @@
                 SetSoilProfileChartData();
             }
 
-            SetWaternetExtremeChartData(DerivedMacroStabilityInwardsInput.GetWaternetExtreme(input, RoundedDouble.NaN));
+            SetWaternetExtremeChartData(DerivedMacroStabilityInwardsInput.GetWaternetExtreme(input, GetEffectiveAssessmentLevel()));
             SetWaternetDailyChartData(DerivedMacroStabilityInwardsInput.GetWaternetDaily(input));
 
             if (data.Output != null)
@@ -469,5 +469,12 @@
                 waternetLineLookup.Add(waternetLine, waternetLineChartData);
             }
         }
+
+        private RoundedDouble GetEffectiveAssessmentLevel()
+        {
+            return data.InputParameters.UseAssessmentLevelManualInput
+                       ? data.InputParameters.AssessmentLevel
+                       : getNormativeAssessmentLevelFunc();
+        }
     }
 }
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