The whole or any part of any appropriation provided in the budget for operating and maintenance expenses of any department or activity remaining unexpended or unencumbered at the close of the fiscal year shall automatically lapse, except any such appropriation as the city council shall continue by ordinance. The whole or any part of any appropriation provided in the budget for capital or betterment outlays of any department or activity remaining unexpended or unencumbered at the close of the fiscal year shall remain in full force and effect and shall be held available for the following year, except any such appropriation as the city council by ordinance may have abandoned.