¹[20B. Power to enter for survey, etc.-- On the issue of a notification under sub-section (1) of section 20A, it shall be lawful for any person, authorised by the competent authority in this behalf, to--
         (a) make any inspection, survey, measurement, valuation or enquiry;
         (b) take levels;
         (c) dig or bore into sub-soil;
         (d) set out boundaries and intended lines of work;
         (e) mark such levels, boundaries and lines placing marks and cutting trenches; or
         (f) do such other acts or things as may be considered necessary by the competent authority.]