Section 174(2) in The New Delhi Municipal Council Act, 1994
(2)Any person desirous of availing himself of the provisions of sub-section (1) shall give to the Chairperson notice of his proposals, and at any time within one month after receipt thereof, the Chairperson may by notice to him refuse to permit the communication to be made, if it appears to him that the mode of construction or condition of the drain is such that the making of the communication would be prejudicial to the drainage system, and for the purpose of examining the mode of construction and condition of the drain he may, if necessary, require it to be laid open for inspection.
