11. (1) The Authority shall, pursuant to the general development plan, prepare in the prescribed manner functional master plans relating to- (a) land use zoning and land reservation; (b) water supply, sewerage and drainage; (c) roads, highways and traffic circulation; and (d) community planning, housing, slum clearance and slum improvement. (2) The Authority may, pursuant to the general development plan, call upon any local Authority or Government organisation or institution dealing with electric supply, railways and tele-communications in an area to which this Ordinance extends to prepare functional master plans in respect of electric supply, railways and tele-communication and thereupon the local Authority or Government organisation or institution shall prepare in the prescribed manner functional master plans in respect thereof. (3) The Authority, any local authority or any Government organisation or institution may be required to prepare functional master plans for the purpose of this Ordinance on such matters as the Government may, by notification in the official Gazette, specify. (4) All functional master plans prepared under sub-section (1) or sub-section (2) shall be submitted by the Authority to the Government for approval and the Government may approve such plans with or without modifications.