Be it further enacted, That after the public hearing the council may insert new items of expenditure or may increase, decrease, or strike out items of expenditure in any budget; provided, that no item of expenditure for debt service or an item required to be include by this or any other Act shall be reduced or stricken out; and provided further, that the total only, and not items, of the school budget may be increased or decreased. The council before the beginning of the ensuing fiscal year shall adopt an appropriation ordinance or ordinances, and any other ordinances necessary to give effect to the budgets; provided, that if emergency conditions prevent the adoption of the appropriation ordinance or ordinances before the beginning of the fiscal year the appropriations in effect for the prior fiscal year shall become appropriations for the new fiscal year, subject to amendment as provided in this article. The council shall not alter the estimates of revenue contained in the budgets except to correct omissions or mathematical errors, and it shall not increase the total of expenditures recommended by the city manager for any budget without a public hearing on such increase, which shall be held not less than five (5) days after notice thereof by publication in the publication in the official city newspaper. The council shall not make appropriations in excess of estimated revenue plus the accumulated surplus; provided, that emergency appropriations for the purpose of meeting public emergencies threatening the lives, health, or property of the inhabitants of the city, declared by a unanimous vote of all members of the council, shall not be subject to this limitation. In the absence of unappropriated revenue to meet such emergency appropriations, the council by resolution may authorize the issuance of notes secured by the faith and credit of the city, each of which shall be designated "emergency note" and may be renewed from time to time, but all such notes and any renewals thereof shall be paid not later than the last day of the fiscal year next succeeding the fiscal year in which the emergency appropriation was made. Each annual appropriation ordinance shall become effective on the first day of the fiscal year for which said ordinance is adopted, without being subject to the waiting period prescribed in Section 2.15 of this Act.