The county board of health shall annually file with the county excise board an estimate of needs for the operation or maintenance of the county, district or cooperative department of health to the extent that county funds are required for such purpose, and it shall be the mandatory duty of the county excise board to approve the same to the extent that such estimate of needs can be financed with proceeds of a levy authorized in accordance with the provisions of Section 9A, Article 10, Oklahoma Constitution; and so much of the levy as may be needed shall thereupon be ordered made. The estimate of needs may include, in addition to items for current operating expenses, items for anticipated capital outlay in the future which may accumulate from year to year until the total required amounts will be available for expenditure. Provided, that nothing herein shall prohibit the appropriation or use of other county funds for such purposes, or for other public health purposes.