Section 125(4) in West Bengal Municipal (Building) Rules, 2007
(4)For the purpose of supplying water to the flushing cistern of a connected pr vy or connected urinal, a reserve tank of such capacity as may be specified by the Authority shall be provided at a height sufficient to supply the cistern with waterProvided that the minimum size of a privy shall be 1.10 m2 (12 sq. ft.). The wall of the privy shall be lined internally with smooth impervious non-absorbent coating of rest Portland Cement and shall be of not less than 1.27 cm. thickness or of the glazed tiles or polished marble to a height of not less than 91 cm:Provided further that every connected privy and connected urinals shall be provided with a pan of such form and dimensions as may be approved by the Authority:Provided also that every connected privy and connected urinal shall be provided with an air-tight water-trap immediately below the pan.
