Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingSoilLayer.cs
===================================================================
diff -u -r1e2f10592270d6b14fddf6286d10091086d5c6a7 -r6692dc3480971fe1c017aef633382c40eb37056f
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingSoilLayer.cs	(.../PipingSoilLayer.cs)	(revision 1e2f10592270d6b14fddf6286d10091086d5c6a7)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingSoilLayer.cs	(.../PipingSoilLayer.cs)	(revision 6692dc3480971fe1c017aef633382c40eb37056f)
@@ -21,9 +21,9 @@
         public double Top { get; private set; }
 
         /// <summary>
-        /// Gets or sets whether the <see cref="PipingSoilLayer"/> is an aquifer.
+        /// Gets or sets the double which represents whether the <see cref="PipingSoilLayer"/> is an aquifer.
         /// </summary>
-        public bool IsAquifer { get; set; }
+        public double? IsAquifer { get; set; }
 
         /// <summary>
         /// Gets or sets the above phreatic level for the <see cref="PipingSoilLayer"/>.