Index: dam engine/trunk/src/Deltares.DamEngine.Data/Geotechnics/Soil.cs
===================================================================
diff -u -r487 -r728
--- dam engine/trunk/src/Deltares.DamEngine.Data/Geotechnics/Soil.cs	(.../Soil.cs)	(revision 487)
+++ dam engine/trunk/src/Deltares.DamEngine.Data/Geotechnics/Soil.cs	(.../Soil.cs)	(revision 728)
@@ -220,7 +220,7 @@
         /// <summary>
         /// Dilatancy (shear thickening) type
         /// </summary>
-        public DilatancyType DilatancyType { get; set; } = DilatancyType.Phi;
+        public DilatancyType? DilatancyType { get; set; } = null;
 
         /// <summary>
         /// Gets or sets the strength increase exponent.
@@ -233,7 +233,24 @@
         /// <summary>
         /// Shear strength model to use
         /// </summary>
-        public ShearStrengthModel ShearStrengthModel { get; set; } = ShearStrengthModel.CPhi;
+        public ShearStrengthModel? ShearStrengthModel { get; set; } = null;
+
+        /// <summary>
+        /// Gets or sets a value indicating whether to use the default shear strength model.
+        /// </summary>
+        /// <value>
+        ///   <c>true</c> if default shear strength model must be used; otherwise, <c>false</c>.
+        /// </value>
+        public bool? DefaultShearStrengthModel { get; set; } = null;
+
+        /// <summary>
+        /// Gets or sets the slope of the rest profile.
+        /// </summary>
+        /// <value>
+        /// The slope of the rest profile.
+        /// </value>
+        public double SlopeRestProfile { get; set; } = double.NaN;
+
         #endregion