No person shall be entitled to a refund of an overcharge unless his claim to the refund has been preferred in writing by him or in his behalf to the Board within six months from the date of payment.

Power to increase rates to cover deficiency of revenue Power to increase rates to cover deficiency of revenue.

1. (1) If, on the preparation of the estimate of any year, it appears that the estimated income of the Board for such year, after deducting therefrom the estimated expenditure of such year, will be insufficient for the payment of the interest which may be payable by the Board during such year to the [Government] or to any other creditor, and of any sinking fund established under section 75 and of any sum the repayment of which is due in pursuance of any loan under section 67 ; or if, at any time in the course of a year, it appears that the income of such portion of the year as has been elapsed, and the estimated income of the residue of such year after deducting therefrom the actual expenditure of such past portion and the estimated expenditure of such residue, will be insufficient for the payment of the said interest, sinking fund, and sums due ; the Board may, and upon the requisition of the [State Government], shall increase the rates for the time being in force to such extent as will render the estimated income of the year sufficient, as nearly as may be, for the payment in full of the said interest, sinking funds and sums due.
2. (2) Such increased rates shall be fixed by the Board, and shall be submitted to the [State Government], and, if approved by the [State Government], shall be published in the [Official Gazette], and shall become leviable after the expiration of one month from the date of such publication, and continue leviable until altered by the Board with the sanction of the [State Government].