law: Indian Easements Act, 1882
  28. Extent of easements
  With respect to the extent of easements and the mode of their
  
  enjoyment, the following provisions shall take effect:-
  Easement of necessity: An easement of necessity is
  
  co-extensive with the necessity as it existed when the easement was imposed.
  Other easements: The extent of any other easement and the mode
  
  of its enjoyment must be fixed with reference to the probable intention of the
  
  parties, and the purpose for which the right was imposed or acquired.
  In the absence of evidence as to such intention and purpose:-
  (a)  Right of way  -A
  
  right of way of any one kind does not include a right of way of any other kind;
  
  
  (b)  Right to light or air
  
  acquired by grant  - The extent of a right to the passage of light or
  
  air to certain window, door or other opening, imposed by a testamentary or
  
  non-testamentary instrument, is the quantity of light or air that entered the
  
  opening at the time the testator died or the non-testamentary instrument was
  
  made;
  (c)  Prescriptive right to
  
  light or air  - The extent of a prescriptive right to the passage of
  
  light or air to a certain window, door or other opening is that quantity of
  
  light or air which has been accustomed to enter that opening during the whole
  
  of the prescriptive period irrespectively of the purposes for which it has been
  
  used;
  (d)  Prescriptive right to
  
  pollute air or water-   The extent of a prescriptive right to pollute
  
  air or water is the extent of the pollution at the commencement of the period
  
  of user on completion of which the right arose; and
  (e)  Other prescriptive
  
  rights-  The extent of every other prescriptive right and the mode
  
  of its enjoyment must be determined by the accustomed user of the right.