Section 12(1)(a) in Tamil Nadu Town and Country Planning Act, 1971
(a)every local planning authority shall be -(i)to carry out a survey of the region and prepare reports on the surveys so carried out;(ii)to prepare an existing land use map and such other maps as may be necessary for the purpose of preparing a regional plan;(iii)to prepare a regional plan;(iv)to carry out or cause to be carried out such works as are contemplated in the Master Plan and Detailed Development Plan.