Section 13(2)(b) in The Bihar Public Irrigation and Drainage Works Act, 1947
(b)If any doubt arises as to the amount of the expenses incurred in connection with any portion of a sanctioned work or the date on which benefits began to accrue to any lands from any portion of such work, the decision of the [Provincial] [Substituted by A.L.O. as State.] Government in the matter shall be final.