After the conclusion of the public hearing the Council shall further consider the proposed budget and make any revisions thereof that it may deem advisable and thereafter it shall adopt the budget with revisions, if any. Upon final adoption, the budget shall be in effect for the ensuing fiscal year. From the effective date of the budget, the several amounts stated therein as proposed expenditures shall be and become appropriated to the various departments or activities therein described. All appropriations shall lapse at the end of the fiscal year to the extent that they shall not have been expended or lawfully encumbered. At any meeting after the adoption of the budget, the Council may amend or supplement the budget by motion adopted by a majority vote of the Council.