12. (1) The Executive Director or any ¹[officer of the Authority or other person] authorised by him in this behalf may, with or without assistants or workmen, enter into or upon any land or order to make any inspection, survey, experiment or enquiry or to erect pillars, make boring and excavation or to do any other act which may be necessary for the purpose of the Ordinance: Provided that no such entry shall be made without giving the owner or the occupier of the land at least three days previous notice of the intention to make such entry. (2) The Authority shall pay compensation for the damage, if any, caused to the land on account of any action under sub-section (1) at such rate and in such manner as may be prescribed.