53. (1) No sums shall be expended by or on behalf of the Authority unless the expenditure of the same is covered by a current budget grant or can be met by reappropriation or by drawing on the closing balance. (2) The closing balance shall not be reduced below such sums as may be fixed by the Government in this behalf, without the previous sanction of the Government. (3) The following items shall be excepted from the provisions of sub-sections (1) and (2), namely-(a) repayments of moneys belonging to contractors or other persons and held in deposit, and of moneys collected by, or credited to, the Authority by mistake;(b) payments due under a decree or order of a Court passed against the Authority or, against the Chairman, ex-officio;(c) sums payable under a compromise of any suit or other legal proceedings;(d) sums payable under this Ordinance by way of compensation;(e) payments required to meet some pressing emergency; and(f) gratuitous payments up to a maximum of five hundred taka. (4) Whenever any sum exceeding five thousand taka is expended under clause (e) of sub-section (3) or whenever any sum is expended under clause (f) of that sub-section, the Chairman shall forthwith report the circumstances to the Government, and shall at the same time explain how the Authority propose to cover the expenditure.