law: Indian Easements Act, 1882
  45. Extinction by destruction of either heritage 
  An easement is extinguished when either the dominant or the
  
  servant heritage is completely destroyed.
  Illustration
  A has a right of way over a road running along the foot of a
  
  sea-cliff. The road is washed away by a permanent encroachment of the sea. A's
  
  easement is extinguished.