Index: DamEngine/branches/DamEngine 18.1/src/Deltares.DamEngine.Data/Geotechnics/SurfaceLine2Extensions.cs
===================================================================
diff -u -r1748 -r1750
--- DamEngine/branches/DamEngine 18.1/src/Deltares.DamEngine.Data/Geotechnics/SurfaceLine2Extensions.cs	(.../DamEngine 18.1 Obsolete/src/Deltares.DamEngine.Data/Geotechnics/SurfaceLine2Extensions.cs)	(revision 1748)
+++ DamEngine/branches/DamEngine 18.1/src/Deltares.DamEngine.Data/Geotechnics/SurfaceLine2Extensions.cs	(.../DamEngine 18.1/src/Deltares.DamEngine.Data/Geotechnics/SurfaceLine2Extensions.cs)	(revision 1750)
@@ -476,6 +476,35 @@
         }
 
         /// <summary>
+        /// Determines the intersection of a horizontal line with the surfaceline, starting
+        /// from <see cref="CharacteristicPointType.SurfaceLevelOutside"/> to <see cref="CharacteristicPointType.DikeTopAtRiver"/>.
+        /// </summary>
+        /// <param name="line">The surfaceline being evaluated.</param>
+        /// <param name="level">The height of the horizontal line.</param>
+        /// <returns>The GeometryPoint at the intersection, or null if no intersection can
+        /// be found.</returns>
+        /// <remarks>
+        /// <para>Requires that the following characteristic points are defined:</para>
+        /// <list type="bullet">
+        /// <item><see cref="CharacteristicPointType.SurfaceLevelOutside"/></item>
+        /// <item><see cref="CharacteristicPointType.DikeTopAtRiver"/></item>
+        /// <item><see cref="CharacteristicPointType.SurfaceLevelInside"/></item>
+        /// </list>
+        /// <para>This method draws the horizontal line starting from the X coordinate of
+        /// <see cref="CharacteristicPointType.SurfaceLevelOutside"/> to <see cref="CharacteristicPointType.SurfaceLevelInside"/>.</para>
+        /// </remarks>
+        /// <exception cref="SurfaceLineException">When <paramref name="level"/> greater than
+        /// the height of the characteristic point <see cref="CharacteristicPointType.DikeTopAtRiver"/>.</exception>
+        /// <seealso cref="DetermineIntersectionWithLevel"/>
+        public static GeometryPoint DetermineIntersectionBetweenTaludRiverSideAndWaterLevel(this SurfaceLine2 line, double level)
+        {
+            double startXCoordinate = line.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.SurfaceLevelOutside).X;
+            var waterlevelLine = GetWaterlevelLineStartingFrom(line, level, startXCoordinate);
+
+            return DetermineIntersectionWithHorizontalLevel(line, waterlevelLine);
+        }
+
+        /// <summary>
         /// Determines the shoulder length for given shoulder top inside.
         /// </summary>
         /// <param name="line">The line.</param>
@@ -613,14 +642,14 @@
         /// Throw an <see cref="SurfaceLineException"/> in case the given height level is
         /// higher than the characteristic point <see cref="CharacteristicPointType.DikeTopAtRiver"/>.
         /// </summary>
-        private static void ThrowWhenLevelAboveDike(SurfaceLine2 line, double Level)
+        private static void ThrowWhenLevelAboveDike(SurfaceLine2 line, double level)
         {
             var dikeTopAtRiver = line.CharacteristicPoints.GetGeometryPoint(CharacteristicPointType.DikeTopAtRiver);
-            if (Level > dikeTopAtRiver.Z)
+            if (level > dikeTopAtRiver.Z)
             {
                 throw new SurfaceLineException(String.Format(
                     "Level ({0:F2} m) should NOT be higher than surface line ({1:F2}))",
-                    Level, dikeTopAtRiver.Z));
+                    level, dikeTopAtRiver.Z));
             }
         }
         #endregion Private methods