Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometryData.cs
===================================================================
diff -u -r5541 -r5612
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometryData.cs	(.../GeometryData.cs)	(revision 5541)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometryData.cs	(.../GeometryData.cs)	(revision 5612)
@@ -742,6 +742,20 @@
     /// </value>
     public List<GeometryLoop> Loops { get; } = [];
 
+    public int InnerLoopsCount
+    {
+        get
+        {
+            var innerLoopsCount = 0;
+            foreach (GeometrySurface surface in Surfaces)
+            {
+                innerLoopsCount += surface.InnerLoops.Count;
+            }
+
+            return innerLoopsCount;
+        }
+    }
+
     /// <summary>
     /// gets the Surface data list.
     /// </summary>
@@ -1122,7 +1136,25 @@
     #endregion
 
     #region other functions
+    
+    /// <summary>
+    /// Determines if there is already a surface with the same outer loop.
+    /// </summary>
+    /// <param name="outerLoop"></param>
+    /// <returns></returns>
+    public bool HasSurfaceWithSameOuterLoop(GeometryLoop outerLoop)
+    {
+        foreach (GeometrySurface geometrySurface in Surfaces)
+        {   
+            if (geometrySurface.OuterLoop.HasSameCurvesByReference(outerLoop))
+            {
+                return true;
+            }      
+        }
 
+        return false;
+    }
+
     #region calculation function
 
     private int GetDependentCurveCount(Point2D point)