Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometrySurface.cs
===================================================================
diff -u -r1974 -r3079
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometrySurface.cs	(.../GeometrySurface.cs)	(revision 1974)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometrySurface.cs	(.../GeometrySurface.cs)	(revision 3079)
@@ -76,6 +76,18 @@
         }
 
         /// <summary>
+        /// Add <see cref="GeometryLoop"/> to <see cref="InnerLoops"/> if it isn't already
+        /// in that collection.
+        /// </summary>
+        public void AddInnerLoop(GeometryLoop aLoop)
+        {
+            if (InnerLoops.Contains(aLoop) == false)
+            {
+                InnerLoops.Add(aLoop);
+            }
+        }
+
+        /// <summary>
         /// determine top of geometry surface outerloop as GeometryPointString
         /// </summary>
         /// <returns></returns>