The preliminary capital budget shall consist of: (1) a financial plan, consistent with section two hundred fifty-eight, covering estimates of capital expenditures for the four ensuing fiscal years, (2) departmental estimates for capital projects as provided in section two hundred twelve together with the cash flow requirements and proposed sources of funding for each project included in such estimates, (3) a capital program status report which sets forth the appropriations for each project included in the capital budget for the current fiscal year together with the expenditures to date, and (4) a summary description of the purpose of each capital project and the needs it will fulfill, the schedule for beginning and constructing the project, its period of probable usefulness and an appropriate maintenance schedule.