Section 28(1) in The Inland Waterways of India Recruitment, Seniority and Promotion Regulations, 1992
(1)Where promotions are made on the basis of selection by DPC, the seniority of such promotes shall be in the order in which they are recommended for such promotion by the Committee. Where promotions, are made on the basis of seniority subject to the rejection of the unfit, the seniority of persons considered fit for promotion at the same time shall be the same as the relative seniority in the lower grade from which they are promoted. Where, however, a person is considered as unfit for promotion and is superseded by a junior, such person shall not, if he is subsequently found suitable and promoted, take seniority in the higher grade over the junior persons who had superseded him.
