On a day to be fixed by the commission, but in no case later than the 1st day of September in each year the city manager shall submit to the commission:
(1) A separate current revenue and expense budget for the general operation of the city government to be known as "operations budget"; and
(2) A budget message.
On a day to be fixed by the commission, but in no case later than the 20th day of March each year the city manager shall submit to the commission:
(1) A supplemental budget, which shall encompass new programs or activities, capital expenditures, and new personnel additions; and
(2) A budget message.
When submitting budgets to the commission, the city manager shall submit his recommendation of new sources of revenue or manner of increasing existing sources of revenue, sufficient to balance the budgets, if such additional revenue is necessary to accomplish that purpose.