is also included within the ambit of the term "development". The A proviso to the definition excludes certain works, which are of temporary nature. Section· 13 of the Act empowers the Government to declare an urban area or group of urban areas to be a development area for proper development of such area or areas. Once an urban area or a group of urban areas is B declared to be a development area, the Government is obliged to constitute an Urban Development Authority under Section 0 3(1). The Development Authority is enjoined with the task of promoting and ensuring development of all or any of the areas comprised in the development area according to the sanctioned c plan and for that purpose, the Authority has the power to acquire, by way of purchase or otherwise, hold, manage, plan, develop and mortgage or otherwise dispose of land and other property, to carry out by or on its behalf building, engineering, mining and other operations, to execute works in connection 0 with supply of water and electricity, disposal of sewerage and control of pollution, other services and amenities [Section 5(1)). Chapter Ill of the Act contains provisions for preparation of Master Plan and Zonal Development Plan. Section 7(1) · provides for preparation of Zonal Development Plan for each of the zones into which the development area may be divided. E Section 7(2) enumerates the matter, which may be spe:cified in the Zonal Development Plan. Clause (a) thereof speaks among other things of land use plan for the development of the zone and the approximate locations and extents of land uses proposed in the zones for purposes like roads, housing, F schools, recreation, hospitals, industry, business, markets, public works and utilities, public buildings, public and private open spaces and other categories of public and private uses. Sections 8 and 9 lay down the procedure for preparation and approval of the Master Plan/Zonal Development Plan. Section G 10 lays down that immediately after approval of Plan by the State Government, the authority shall publish a notice evidencing such approval and from the date of first publication of notice the Plan shall come into operation. Section 12(1)