work on vater limits for top view visualization

src/Model/Geometry/Profile.py

@@ -351,3 +351,7 @@ class Profile(object):
     # Abstract method for width approximation
     def width_approximation(self):
         raise NotImplementedMethodeError(self, self.width_approximation)
+
+    # Abstract method for width approximation
+    def get_water_limits(self, z):
+        raise NotImplementedMethodeError(self, self.get_water_limits)