If in the opinion of the board, it is advisable that any project be acquired, constructed or completed, in whole or in part, it shall cause a report thereon to be made by any appropriate county officer or officers, which shall include:

1. (a) An estimate of the probable cost of the acquisition, construction and completion, including all incidental expenses, engineering, legal and administrative during the construction;
2. (b) An estimate of probable sources of income and the amount thereof;

3. (c) An estimate of the cost of maintenance and for the operation upon completion, including the cost of all repairs, administrative and overhead charges.

   The expense of the preparation of the report shall be a county charge and shall be paid by the board out of any funds of the county available therefor.