Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingSoilProfileExtensions.cs
===================================================================
diff -u -rc5cf6b665f7eeab37930451dfb0d7efeb5595c3d -r5a97661a957b3500e532f449ebfdfa55783450d1
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingSoilProfileExtensions.cs	(.../PipingSoilProfileExtensions.cs)	(revision c5cf6b665f7eeab37930451dfb0d7efeb5595c3d)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingSoilProfileExtensions.cs	(.../PipingSoilProfileExtensions.cs)	(revision 5a97661a957b3500e532f449ebfdfa55783450d1)
@@ -26,6 +26,9 @@
 
 namespace Ringtoets.Piping.Data
 {
+    /// <summary>
+    /// Defines extension methods dealing with <see cref="PipingSoilProfile"/> instances.
+    /// </summary>
     public static class PipingSoilProfileExtensions
     {
         /// <summary>
@@ -38,8 +41,8 @@
         public static double GetTopmostConsecutiveAquiferLayerThicknessBelowLevel(this PipingSoilProfile soilProfile, double level)
         {
             return TotalThicknessOfConsecutiveLayersBelowLevel(
-                soilProfile, 
-                level, 
+                soilProfile,
+                level,
                 soilProfile.GetConsecutiveAquiferLayersBelowLevel(level).ToArray());
         }
 
@@ -53,12 +56,43 @@
         public static double GetConsecutiveCoverageLayerThicknessBelowLevel(this PipingSoilProfile soilProfile, double level)
         {
             return TotalThicknessOfConsecutiveLayersBelowLevel(
-                soilProfile, 
-                level, 
+                soilProfile,
+                level,
                 soilProfile.GetConsecutiveCoverageLayersBelowLevel(level).ToArray());
         }
 
         /// <summary>
+        /// Retrieves the collection of aquifer layers below a certain <paramref name="level"/>.
+        /// </summary>
+        /// <param name="soilProfile">The soil profile containing <see cref="PipingSoilLayer"/> to consider.</param>
+        /// <param name="level">The level under which the aquifer layers are sought.</param>
+        /// <returns>The collection of consecutive aquifer layer(s) (partly) under the <paramref name="level"/>.</returns>
+        public static IEnumerable<PipingSoilLayer> GetConsecutiveAquiferLayersBelowLevel(this PipingSoilProfile soilProfile, double level)
+        {
+            return GetConsecutiveLayers(soilProfile, level, true);
+        }
+
+        /// <summary>
+        /// Retrieves the collection of aquitard layers below a certain <paramref name="level"/>.
+        /// </summary>
+        /// <param name="soilProfile">The soil profile containing <see cref="PipingSoilLayer"/> to consider.</param>
+        /// <param name="level">The level under which the aquitard layers are sought.</param>
+        /// <returns>The collection of consecutive aquitard layer(s) (partly) under the <paramref name="level"/>.</returns>
+        public static IEnumerable<PipingSoilLayer> GetConsecutiveCoverageLayersBelowLevel(this PipingSoilProfile soilProfile, double level)
+        {
+            var topAquiferLayer = soilProfile.GetConsecutiveAquiferLayersBelowLevel(level).FirstOrDefault();
+            if (topAquiferLayer != null)
+            {
+                var aquitardLayers = GetConsecutiveLayers(soilProfile, level, false).ToArray();
+                if (aquitardLayers.Any() && topAquiferLayer.Top < aquitardLayers.First().Top)
+                {
+                    return aquitardLayers;
+                }
+            }
+            return Enumerable.Empty<PipingSoilLayer>();
+        }
+
+        /// <summary>
         /// Calculates the thickness of a collection of consecutive <see cref="PipingSoilLayer"/>.
         /// </summary>
         /// <param name="soilProfile">The <see cref="PipingSoilProfile"/> containing the <paramref name="layers"/>.</param>
@@ -68,7 +102,7 @@
         /// <returns>The total thickness of the consecutive layers below the given <paramref name="level"/>.</returns>
         /// <exception cref="ArgumentNullException">Thrown when either <paramref name="soilProfile"/> or
         /// <paramref name="layers"/> is <c>null</c>.</exception>
-        /// <exception cref="ArgumentException">The bottom most <see cref="PipingSoilLayer"/> is not part of
+        /// <exception cref="ArgumentException">Thrown when the bottom most <see cref="PipingSoilLayer"/> is not part of
         /// <paramref name="soilProfile"/>.</exception>
         private static double TotalThicknessOfConsecutiveLayersBelowLevel(PipingSoilProfile soilProfile, double level, PipingSoilLayer[] layers)
         {
@@ -92,37 +126,6 @@
         }
 
         /// <summary>
-        /// Retrieves the collection of aquifer layers below a certain <paramref name="level"/>.
-        /// </summary>
-        /// <param name="soilProfile">The soil profile containing <see cref="PipingSoilLayer"/> to consider.</param>
-        /// <param name="level">The level under which the aquifer layers are sought.</param>
-        /// <returns>The collection of consecutive aquifer layer(s) (partly) under the <paramref name="level"/>.</returns>
-        public static IEnumerable<PipingSoilLayer> GetConsecutiveAquiferLayersBelowLevel(this PipingSoilProfile soilProfile, double level)
-        {
-            return GetConsecutiveLayers(soilProfile, level, true);
-        }
-
-        /// <summary>
-        /// Retrieves the collection of aquitard layers below a certain <paramref name="level"/>.
-        /// </summary>
-        /// <param name="soilProfile">The soil profile containing <see cref="PipingSoilLayer"/> to consider.</param>
-        /// <param name="level">The level under which the aquitard layers are sought.</param>
-        /// <returns>The collection of consecutive aquitard layer(s) (partly) under the <paramref name="level"/>.</returns>
-        public static IEnumerable<PipingSoilLayer> GetConsecutiveCoverageLayersBelowLevel(this PipingSoilProfile soilProfile, double level)
-        {
-            var topAquiferLayer = soilProfile.GetConsecutiveAquiferLayersBelowLevel(level).FirstOrDefault();
-            if (topAquiferLayer != null)
-            {
-                var aquitardLayers = GetConsecutiveLayers(soilProfile, level, false).ToArray();
-                if (aquitardLayers.Any() && topAquiferLayer.Top < aquitardLayers.First().Top)
-                {
-                    return aquitardLayers;
-                }
-            }
-            return Enumerable.Empty<PipingSoilLayer>();
-        }
-
-        /// <summary>
         /// Gets consecutive layers in the <see cref="soilProfile"/> which have an aquifer property of <paramref name="isAquifer"/>.
         /// </summary>
         /// <param name="soilProfile">The soil profile containing <see cref="PipingSoilLayer"/> to consider.</param>