(a) Supplemental Appropriations. If during the fiscal year the Mayor certifies that there are available for appropriation revenues in excess of those estimated in the budget, the Council by ordinance may make supplemental appropriations for the year up to the amount of such excess.
(b) Emergency Appropriations. To meet a public emergency affecting life, health, property or the public peace, the Council may make emergency appropriations. Such appropriations may be made by emergency ordinance in accordance with provisions of Section 3.13. To the extent that there are no available unappropriated revenues to meet such appropriations, the Council may by such emergency ordinance authorize the issuance of emergency notes, which may be renewed from time to time, but the emergency notes and renewals of any fiscal year shall be paid not later than the last day of the fiscal year next succeeding that in which the appropriation was made.
(c) Reduction of Appropriations. If at any time during the year it appears probable to the Mayor that the revenues available will be insufficient to meet the amount appropriated, he or she shall report to the Council without delay, indicating the estimated amount of the deficit, any remedial action taken by him or her and his or her recommendations as to any other steps to be taken. The Council shall then take such further action as it deems necessary to prevent or minimize any deficit, and for that purpose it may by ordinance reduce one or more appropriations.
(d) Transfer of Appropriations. At any time during the fiscal year the Mayor may transfer part or all of any unencumbered appropriation balance among programs within a department, office or agency and, upon written request by the Mayor, the Council may by ordinance transfer part or all of any unencumbered appropriation balance from one department, office or agency to another.
(e) Limitations; Effective Date. No appropriation for debt service may be reduced or transferred, and no appropriation may be reduced below any amount required by law to be appropriated or by more than the amount of the unencumbered balance thereof. The supplemental and emergency appropriations and reduction or transfer of appropriations authorized by this section may be made effective immediately upon adoption.