Index: Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Calculator/DikeHeightCalculator.cs
===================================================================
diff -u -r1b0460d5f81926d0366ab10e4b0e9f6d75809c71 -re69acb9595f7bf1d202ddd1fb51934b66768b75d
--- Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Calculator/DikeHeightCalculator.cs	(.../DikeHeightCalculator.cs)	(revision 1b0460d5f81926d0366ab10e4b0e9f6d75809c71)
+++ Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Calculator/DikeHeightCalculator.cs	(.../DikeHeightCalculator.cs)	(revision e69acb9595f7bf1d202ddd1fb51934b66768b75d)
@@ -19,6 +19,7 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
 using System.Collections.Generic;
 using Ringtoets.HydraRing.Calculation.Data;
 using Ringtoets.HydraRing.Calculation.Data.Input.Hydraulics;
@@ -30,21 +31,19 @@
     /// Calculator which calculates the dike height associated to the result of iterating towards a
     /// probability of failure given a norm.
     /// </summary>
-    public class DikeHeightCalculator : HydraRingCalculatorBase, IDikeHeightCalculator
+    internal class DikeHeightCalculator : HydraRingCalculatorBase, IDikeHeightCalculator
     {
-        private readonly string hlcdDirectory;
-        private readonly string ringId;
         private readonly ReliabilityIndexCalculationParser targetProbabilityParser;
 
         /// <summary>
         /// Create a new instance of <see cref="DikeHeightCalculator"/>.
         /// </summary>
         /// <param name="hlcdDirectory">The directory in which the Hydraulic Boundary Database can be found.</param>
         /// <param name="ringId">The id of the traject which is used in the calculation.</param>
+        /// <exception cref="ArgumentNullException">Thrown when <paramref name="hlcdDirectory"/> is <c>null</c>.</exception>
         internal DikeHeightCalculator(string hlcdDirectory, string ringId)
+            : base(hlcdDirectory, ringId)
         {
-            this.hlcdDirectory = hlcdDirectory;
-            this.ringId = ringId;
             targetProbabilityParser = new ReliabilityIndexCalculationParser();
 
             DikeHeight = double.NaN;
@@ -54,7 +53,7 @@
 
         public void Calculate(DikeHeightCalculationInput input)
         {
-            Calculate(hlcdDirectory, ringId, HydraRingUncertaintiesType.All, input);
+            Calculate(HydraRingUncertaintiesType.All, input);
         }
 
         protected override IEnumerable<IHydraRingFileParser> GetParsers()