law: Land Acquisition Act, 1894
  17.Special powers in
  
  cases of urgency:-
  (1) In cases of
  
  urgency, whenever the appropriate Government so directs, the Collector, though
  
  no such award has been made, may, on the expiration of fifteen days from the
  
  publication of the notice mentioned in section 9, sub-section (1), take
  
  possession of any waste or arable land needed for public purposes or for a
  
  Company. Such land shall thereupon vest absolutely in the Government, free from
  
  all encumbrances.
  (2) Whenever, owing to
  
  any sudden change in the channel of any navigable river or other unforeseen
  
  emergency, it becomes necessary for any Railway administration to acquire the
  
  immediate possession of any land for the maintenance of their traffic or for
  
  the purpose of making thereon a river-side or ghat station, or of providing
  
  convenient connection with or access to any such station, the Collector may,
  
  immediately after the publication of the notice mentioned in sub-section (1)
  
  and with the previous sanction of the appropriate Government enter upon and
  
  take possession of such land, which shall thereupon vest absolutely in the
  
  Government free from all encumbrances.
  
  Provided that the Collector shall not take possession of any building or
  
  part of a building under this sub-section without giving to the occupier
  
  thereof at least forty-eight hour's notice of his intention so to do, or such
  
  longer notice as may be reasonably sufficient to enable such occupier to remove
  
  his movable property from such building without unnecessary inconvenience.
  (3) In every case
  
  under either of the preceding sub-sections the Collector shall at the time of
  
  taking possession offer to the persons interested compensation for the standing
  
  crops and trees (if any) on such land and for any other damage sustained by
  
  them caused by such sudden dispossession and not excepted in section 24; and,
  
  in cases, such offer is not accepted, the value of such crops and trees and the
  
  amount of such other damage shall be allowed for in awarding compensation for
  
  the land under the provisions herein contained.
  {Ins.by Act 38 of 1923,
  
  s.6}[(4) In the case of any land to which, in the opinion of the appropriate
  
  Government, the provisions of sub-section (1) or sub-section (2) are
  
  applicable, the appropriate Government may direct that the provisions of
  
  section 5A shall not apply, and, if it does not so direct, a declaration may be
  
  made under section 6 in respect of the land at any time after the publication
  
  of the notification under section 4, sub-section (1).]