Each year the County Executive shall determine an operating budget. The Director of the Budget shall prepare budget instructions, and budget request forms which shall be followed by all County departments and agencies. The departments and agencies shall submit budget requests to the Director of the Budget in accordance with the prescribed calendar, instructions and forms and shall provide such fiscal information as may be determined by the Director of the Budget. In the event that any County Department or agency does not submit its budget request in accordance with the prescribed budget, the Director of the Budget may prepare a budget request for such department or agency based upon its previous fiscal year expenditures.