diff --git a/src/Model/Geometry/Profile.py b/src/Model/Geometry/Profile.py
index 1d510a92..2fda9547 100644
--- a/src/Model/Geometry/Profile.py
+++ b/src/Model/Geometry/Profile.py
@@ -93,6 +93,9 @@ class Profile(object):
             return self.points[0]
         elif name == "np":
             return self.points[-1]
+        elif name == "talweg":
+            zm = self.z_min()
+            return next((p for p in self.points if p.z == zm), None)
         else:
             return next((p for p in self.points if p.name == name), None)
 
@@ -101,6 +104,12 @@ class Profile(object):
             return 0
         elif name == "np":
             return len(self.points) - 1
+        elif name == "talweg":
+            zm = self.z_min()
+            return next(
+                (p for p in enumerate(self.points) if p[1].z == zm),
+                None
+            )[0]
         else:
             return next(
                 (p for p in enumerate(self.points) if p[1].name == name),
diff --git a/src/View/Geometry/UpdateRKDialog.py b/src/View/Geometry/UpdateRKDialog.py
index ec591660..776a196b 100644
--- a/src/View/Geometry/UpdateRKDialog.py
+++ b/src/View/Geometry/UpdateRKDialog.py
@@ -119,8 +119,8 @@ class UpdateRKDialog(PamhyrDialog):
         return name
 
     def _init_default_values_guidelines(self):
-        bgl = ['un'] + self._gl + ['np']
-        egl = ['un'] + self._gl + ['np']
+        bgl = ['un'] + self._gl + ['np', 'talweg']
+        egl = ['un'] + self._gl + ['np', 'talweg']
 
         self.combobox_add_items("comboBox_begin_gl", bgl)
         self.combobox_add_items("comboBox_end_gl", egl)