From the effective date of the budget, the several amounts stated therein as proposed expenditures shall be and become appropriated to the several objects and purposes therein named. After the budget has been adopted, no money shall be drawn from the Treasury of the City during the fiscal year to which such budget applies, nor shall any obligation for the expenditure of money be incurred during such year except pursuant to the budget appropriation, provided that the Council may transfer any unencumbered appropriation balance or any portion thereof from one department, fund or agency to another. The balance in any appropriation which has not been , encumbered or transferred at the end of the fiscal year shall revert to the General Fund,