Water falls moving backwards?

Waterfalls moving backwards

Myth  or  Fact?                                                                                                                          
There are waterfalls that move backwards.  (Unfortunately I am unable to find the name of the waterfall.)

Why?
 As water crashes down from falling it erodes the riverbed at the bottom of the falls and eventually it erodes a space back underneath the lip of the water that is falling. At some point the erosion underneath the falls causes the upper part to collapse. This process continues making the waterfall move upstream.







By; Dinesh Manoharan