Section 7(4) in The Bihar Irrigation and Flood Protection, (Betterment Contribution) Rules, 1961
(4)If the notice relates to a case in which persons having the same interest are so numerous that personal service on each one of them is not practicable, it may be served by delivering or tendering a copy thereof to such of those persons as the Collector specifically nominates in this behalf, and by proclamation of the contents thereof for the information of the other interested persons.
