Section 59 in West Bengal Municipal (Building) Rules, 2007
59. Roof.
(1) The roof of a building shall be so constructed or framed as to permit effectual drainage of the rain-water therefrom by means of sufficient rain-water pipes of adequate size, wherever required, and so arranged, joined and fixed as to ensure that the rain-water is carried away from the building without causing dampness in any part of the walls or foundations of the building or those of an adjacent building.(2)The Board of Councillors may require rain-water pipes to be connected to a drain or sewer through a covered channel formed beneath any street to connect the rain-water pipe to a road gutter or any other approved device.(3)Rain-water pipes shall be affixed to the outside of the walls of the buildings in recesses or chases cut or formed in such walls or in such other manner as may be approved by the Board of Councillors.(4)Every terrace on the top-most storey of any building shall have a common access and shall not be sub-divided.
