Index: src/Plugins/Wti/Wti.Calculation/Piping/PipingCalculationInput.cs
===================================================================
diff -u -r9f140a1d7ebc5dfaabd213c626b596ad55f66e56 -r2f9f3715577a997e8717aedc5f3667627ba7eac5
--- src/Plugins/Wti/Wti.Calculation/Piping/PipingCalculationInput.cs	(.../PipingCalculationInput.cs)	(revision 9f140a1d7ebc5dfaabd213c626b596ad55f66e56)
+++ src/Plugins/Wti/Wti.Calculation/Piping/PipingCalculationInput.cs	(.../PipingCalculationInput.cs)	(revision 2f9f3715577a997e8717aedc5f3667627ba7eac5)
@@ -31,6 +31,9 @@
 
         #region properties
 
+        /// <summary>
+        /// Gets the volumetric weight of water.
+        /// </summary>
         public double WaterVolumetricWeight
         {
             get
@@ -39,6 +42,9 @@
             }
         }
 
+        /// <summary>
+        /// Gets the calculation value used to account for uncertainty in the model for uplift.
+        /// </summary>
         public double UpliftModelFactor
         {
             get
@@ -47,6 +53,9 @@
             }
         }
 
+        /// <summary>
+        /// Gets the effective stress of a layer.
+        /// </summary>
         public double EffectiveStress
         {
             get
@@ -55,6 +64,9 @@
             }
         }
 
+        /// <summary>
+        /// Gets the outside high water level.
+        /// </summary>
         public double AssessmentLevel
         {
             get
@@ -63,6 +75,9 @@
             }
         }
 
+        /// <summary>
+        /// Gets the piezometric head at the exit point.
+        /// </summary>
         public double PiezometricHeadExit
         {
             get
@@ -71,6 +86,9 @@
             }
         }
 
+        /// <summary>
+        /// Gets the damping factor at the exit point.
+        /// </summary>
         public double DampingFactorExit
         {
             get
@@ -79,6 +97,9 @@
             }
         }
 
+        /// <summary>
+        /// Gets the phreatic level at the exit point.
+        /// </summary>
         public double PhreaticLevelExit
         {
             get
@@ -87,6 +108,9 @@
             }
         }
 
+        /// <summary>
+        /// Gets the piezometric head in the hinterland.
+        /// </summary>
         public double PiezometricHeadPolder
         {
             get
@@ -95,6 +119,9 @@
             }
         }
 
+        /// <summary>
+        /// Gets the critical exit gradient for heave.
+        /// </summary>
         public double CriticalHeaveGradient
         {
             get
@@ -103,6 +130,9 @@
             }
         }
 
+        /// <summary>
+        /// Gets the total thickness of the coverage layer at the exit point.
+        /// </summary>
         public double ThicknessCoverageLayer
         {
             get
@@ -111,13 +141,19 @@
             }
         }
 
+        /// <summary>
+        /// Gets the calculation value used to account for uncertainty in the model for Sellmeijer.
+        /// </summary>
         public double SellmeijerModelFactor {
             get
             {
                 return sellmeijerModelFactor;
             }
         }
 
+        /// <summary>
+        /// Gets the reduction factor Sellmeijer.
+        /// </summary>
         public double ReductionFactorSellmeijer
         {
             get
@@ -126,6 +162,9 @@
             }
         }
 
+        /// <summary>
+        /// Gets the horizontal distance between entree and exit point.
+        /// </summary>
         public double SeepageLength
         {
             get
@@ -134,6 +173,9 @@
             }
         }
 
+        /// <summary>
+        /// Gets the (lowerbound) volumic weight of sand grain material of a sand layer under water.
+        /// </summary>
         public double SandParticlesVolumicWeight
         {
             get
@@ -142,6 +184,9 @@
             }
         }
 
+        /// <summary>
+        /// Gets the White's drag coefficient.
+        /// </summary>
         public double WhitesDragCoefficient
         {
             get
@@ -150,6 +195,9 @@
             }
         }
 
+        /// <summary>
+        /// Gets the sieve size through which 70% fraction of the grains of the top part of the aquifer passes.
+        /// </summary>
         public double Diameter70
         {
             get
@@ -158,6 +206,9 @@
             }
         }
 
+        /// <summary>
+        /// Gets the Darcy-speed with which water flows through the aquifer layer.
+        /// </summary>
         public double DarcyPermeability
         {
             get
@@ -166,6 +217,9 @@
             }
         }
 
+        /// <summary>
+        /// Gets the kinematic viscosity of water at 10 degrees Celsius.
+        /// </summary>
         public double WaterKinematicViscosity
         {
             get
@@ -174,6 +228,9 @@
             }
         }
 
+        /// <summary>
+        /// Gets the gravitational acceleration.
+        /// </summary>
         public double Gravity
         {
             get
@@ -182,6 +239,9 @@
             }
         }
 
+        /// <summary>
+        /// Gets the thickness of the aquifer layer.
+        /// </summary>
         public double ThicknessAquiferLayer
         {
             get
@@ -190,6 +250,9 @@
             }
         }
 
+        /// <summary>
+        /// Gets the mean diameter of small scale tests applied to different kinds of sand, on which the formula of Sellmeijer has been fit.
+        /// </summary>
         public double MeanDiameter70
         {
             get
@@ -198,6 +261,9 @@
             }
         }
 
+        /// <summary>
+        /// Gets the angle of the force balance representing the amount in which sand grains resist rolling.
+        /// </summary>
         public double BeddingAngle
         {
             get
@@ -206,6 +272,9 @@
             }
         }
 
+        /// <summary>
+        /// Gets the x coordinate of the exit point.
+        /// </summary>
         public double ExitPointXCoordinate
         {
             get
@@ -221,28 +290,28 @@
         /// in the piping sub calculations.
         /// </summary>
         /// <param name="waterVolumetricWeight">The volumetric weight of water.</param>
-        /// <param name="upliftModelFactor">Calculation value used to account for uncertainty in the model for uplift.</param>
+        /// <param name="upliftModelFactor">The calculation value used to account for uncertainty in the model for uplift.</param>
         /// <param name="effectiveStress">The effective stress of a layer.</param>
-        /// <param name="assessmentLevel">Outside high water level.</param>
-        /// <param name="piezometricHeadExit">Piezometric head at the exit point.</param>
-        /// <param name="dampingFactorExit">Damping factor at the exit point.</param>
-        /// <param name="phreaticLevelExit">Phreatic level at the exit point.</param>
-        /// <param name="piezometricHeadPolder">Piezometric head in the hinterland.</param>
-        /// <param name="criticalHeaveGradient">Critical exit gradient for heave.</param>
+        /// <param name="assessmentLevel">The outside high water level.</param>
+        /// <param name="piezometricHeadExit">The piezometric head at the exit point.</param>
+        /// <param name="dampingFactorExit">The damping factor at the exit point.</param>
+        /// <param name="phreaticLevelExit">The phreatic level at the exit point.</param>
+        /// <param name="piezometricHeadPolder">The piezometric head in the hinterland.</param>
+        /// <param name="criticalHeaveGradient">The critical exit gradient for heave.</param>
         /// <param name="thicknessCoverageLayer">The total thickness of the coverage layer at the exit point.</param>
-        /// <param name="sellmeijerModelFactor">Calculation value used to account for uncertainty in the model for Sellmeijer.</param>
-        /// <param name="reductionFactorSellmeijer">Reduction factor Sellmeijer.</param>
-        /// <param name="seepageLength">Horizontal distance between entree and exit point.</param>
+        /// <param name="sellmeijerModelFactor">The calculation value used to account for uncertainty in the model for Sellmeijer.</param>
+        /// <param name="reductionFactorSellmeijer">The reduction factor Sellmeijer.</param>
+        /// <param name="seepageLength">The horizontal distance between entree and exit point.</param>
         /// <param name="sandParticlesVolumicWeight">The (lowerbound) volumic weight of sand grain material of a sand layer under water.</param>
-        /// <param name="whitesDragCoefficient">White's drag coefficient.</param>
-        /// <param name="diameter70">Sieve size through which 70% fraction of the grains of the top part of the aquifer passes.</param>
-        /// <param name="darcyPermeability">Darcy-speed with which water flows through the aquifer layer.</param>
+        /// <param name="whitesDragCoefficient">The White's drag coefficient.</param>
+        /// <param name="diameter70">The sieve size through which 70% fraction of the grains of the top part of the aquifer passes.</param>
+        /// <param name="darcyPermeability">The Darcy-speed with which water flows through the aquifer layer.</param>
         /// <param name="waterKinematicViscosity">The kinematic viscosity of water at 10 degrees Celsius.</param>
-        /// <param name="gravity">Gravitational acceleration.</param>
+        /// <param name="gravity">The gravitational acceleration.</param>
         /// <param name="thicknessAquiferLayer">The thickness of the aquifer layer.</param>
-        /// <param name="meanDiameter70">Mean diameter of small scale tests applied to different kinds of sand, on which the formula of Sellmeijer has been fit.</param>
-        /// <param name="beddingAngle">Angle of the force balance representing the amount in which sand grains resist rolling.</param>
-        /// <param name="exitPointXCoordinate">X coordinate of the exit point.</param>
+        /// <param name="meanDiameter70">The mean diameter of small scale tests applied to different kinds of sand, on which the formula of Sellmeijer has been fit.</param>
+        /// <param name="beddingAngle">The angle of the force balance representing the amount in which sand grains resist rolling.</param>
+        /// <param name="exitPointXCoordinate">The x coordinate of the exit point.</param>
         public PipingCalculationInput(
             double waterVolumetricWeight,
             double upliftModelFactor,
Index: src/Plugins/Wti/Wti.Calculation/Piping/PipingCalculationResult.cs
===================================================================
diff -u -r9f140a1d7ebc5dfaabd213c626b596ad55f66e56 -r2f9f3715577a997e8717aedc5f3667627ba7eac5
--- src/Plugins/Wti/Wti.Calculation/Piping/PipingCalculationResult.cs	(.../PipingCalculationResult.cs)	(revision 9f140a1d7ebc5dfaabd213c626b596ad55f66e56)
+++ src/Plugins/Wti/Wti.Calculation/Piping/PipingCalculationResult.cs	(.../PipingCalculationResult.cs)	(revision 2f9f3715577a997e8717aedc5f3667627ba7eac5)
@@ -1,5 +1,8 @@
 namespace Wti.Calculation.Piping
 {
+    /// <summary>
+    /// This class contains all the results of a complete piping calculation.
+    /// </summary>
     public class PipingCalculationResult {
         private readonly double upliftZValue;
         private readonly double upliftFactorOfSafety;
@@ -11,7 +14,7 @@
         #region properties
 
         /// <summary>
-        /// The z-value of the Uplift sub calculation.
+        /// Gets the z-value of the Uplift sub calculation.
         /// </summary>
         public double UpliftZValue { get
             {
@@ -20,7 +23,7 @@
         }
 
         /// <summary>
-        /// The factory of safety of the Uplift sub calculation.
+        /// Gets the factory of safety of the Uplift sub calculation.
         /// </summary>
         public double UpliftFactorOfSafety
         {
@@ -31,7 +34,7 @@
         }
 
         /// <summary>
-        /// The z-value of the Heave sub calculation.
+        /// Gets the z-value of the Heave sub calculation.
         /// </summary>
         public double HeaveZValue
         {
@@ -42,7 +45,7 @@
         }
 
         /// <summary>
-        /// The factory of safety of the Heave sub calculation.
+        /// Gets the factory of safety of the Heave sub calculation.
         /// </summary>
         public double HeaveFactorOfSafety
         {
@@ -53,7 +56,7 @@
         }
 
         /// <summary>
-        /// The z-value of the Sellmeijer sub calculation.
+        /// Gets the z-value of the Sellmeijer sub calculation.
         /// </summary>
         public double SellmeijerZValue
         {
@@ -64,7 +67,7 @@
         }
 
         /// <summary>
-        /// The factory of safety of the Sellmeijer sub calculation.
+        /// Gets the factory of safety of the Sellmeijer sub calculation.
         /// </summary>
         public double SellmeijerFactorOfSafety
         {
Index: src/Plugins/Wti/Wti.Calculation/Piping/PipingProfileCreator.cs
===================================================================
diff -u -r9f140a1d7ebc5dfaabd213c626b596ad55f66e56 -r2f9f3715577a997e8717aedc5f3667627ba7eac5
--- src/Plugins/Wti/Wti.Calculation/Piping/PipingProfileCreator.cs	(.../PipingProfileCreator.cs)	(revision 9f140a1d7ebc5dfaabd213c626b596ad55f66e56)
+++ src/Plugins/Wti/Wti.Calculation/Piping/PipingProfileCreator.cs	(.../PipingProfileCreator.cs)	(revision 2f9f3715577a997e8717aedc5f3667627ba7eac5)
@@ -7,6 +7,10 @@
     /// </summary>
     internal class PipingProfileCreator
     {
+        /// <summary>
+        /// Creates a simple <see cref="PipingProfile"/> with a single default constructed <see cref="PipingLayer"/>.
+        /// </summary>
+        /// <returns></returns>
         public PipingProfile Create()
         {
             var profile = new PipingProfile();
Index: src/Plugins/Wti/Wti.Calculation/Piping/PipingSurfaceLineCreator.cs
===================================================================
diff -u -r9f140a1d7ebc5dfaabd213c626b596ad55f66e56 -r2f9f3715577a997e8717aedc5f3667627ba7eac5
--- src/Plugins/Wti/Wti.Calculation/Piping/PipingSurfaceLineCreator.cs	(.../PipingSurfaceLineCreator.cs)	(revision 9f140a1d7ebc5dfaabd213c626b596ad55f66e56)
+++ src/Plugins/Wti/Wti.Calculation/Piping/PipingSurfaceLineCreator.cs	(.../PipingSurfaceLineCreator.cs)	(revision 2f9f3715577a997e8717aedc5f3667627ba7eac5)
@@ -7,6 +7,10 @@
     /// </summary>
     internal class PipingSurfaceLineCreator
     {
+        /// <summary>
+        /// Creates a simple <see cref="PipingSurfaceLine"/> with a single <see cref="PipingPoint"/> at the origin.
+        /// </summary>
+        /// <returns></returns>
         public PipingSurfaceLine Create()
         {
             var surfaceLine = new PipingSurfaceLine();