4. Notwithstanding sections 1 to 3, the Government may appropriate the reserve fund in whole or in part to the maintenance of budgetary balance where it considers any of the following circumstances has arisen :(1) a disaster having a major impact on revenue or expenditure ;
(2) a significant deterioration of economic conditions ; or
(3) a change in federal programs of transfer payments to the provinces that would substantially reduce transfer payments to the Government.